THE PUMP HOW IT WORKS AIR SYSTEM HOW IT WORKS

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THE PUMP HOW IT WORKS AIR SYSTEM HOW IT WORKS Powered By Docstoc
					      SECTION 1A
      THE PUMP — HOW IT WORKS
      The diaphragm pump is an air-operated, positive displacement, self-priming pump. These drawings show the flow pattern through the pump upon
      its initial stroke. It is assumed the pump has no fluid in it prior to its initial stroke.




                    RIGHT STROKE                                           MID STROKE                                         LEFT STROKE

      FIGURE 1: The air valve directs pressurized          FIGURE 2: When the pressurized diaphragm,            FIGURE 3: At completion of the stroke, the
      air to the back side of diaphragm A. The             diaphragm A, reaches the limit of its discharge      air valve again redirects air to the back side
      compressed air is applied directly to the liquid     stroke, the air valve redirects pressurized air to   of diaphragm A, which starts diaphragm B
      column separated by elasomeric diaphragms.           the back side of diaphragm B. The pressurized        on its exhaust stroke. As the pump reaches
      The diaphragm acts as a separation membrane          air forces diaphragm B away from the center          its original starting point, each diaphragm
      between the compressed air and liquid,               block while pulling diaphragm A to the center        has gone through one exhaust stroke and
      balancing the load and removing mechanical           block. Diaphragm B is now on its discharge           one discharge stroke. This constitutes one
      stress from the diaphragm. The compressed            stroke. Diaphragm B forces the inlet valve           complete pumping cycle. The pump may take
      air moves the diaphragm away from the center         ball onto its seat due to the hydraulic forces       several cycles to completely prime depending
      block of the pump. The opposite diaphragm            developed in the liquid chamber and manifold         on the conditions of the application.
      is pulled in by the shaft connected to the           of the pump. These same hydraulic forces lift
      pressurized diaphragm. Diaphragm B is on its         the discharge valve ball off its seat, while the
      suction stroke; air behind the diaphragm has         opposite discharge valve ball is forced onto its
      been forced out of the atmosphere through            seat, forcing fluid to flow through the pump
      the exhaust port of the pump. The movement           discharge. The movement of diaphragm A
      of diaphragm B toward the center block of the        towards the center block of the pump creates a
      pump creates a vacuum within chamber B.              vacuum within liquid chamber A. Atmospheric
      Atmospheric pressure forces fluid into the inlet     pressure forces fluid into the inlet manifold of
      manifold forcing the inlet valve ball of its seat.   the pump. The inlet valve ball is forced off its
      Liquid is free to move past the inlet valve ball     seat allowing the fluid being pumped to fill the
      and fill the liquid chamber (see shaded area).       liquid chamber.




      SECTION 1B
      AIR SYSTEM — HOW IT WORKS
      AIR DISTRIBUTION SYSTEM
      The air distribution system consists of a ported air valve body, which houses a piston. This
      piston is the only moving component of the air distribution system. The system operates off
      of differential pressure only, there are no mechanical trip rods, bearings or springs to wear or
      repair. The air valve attaches to a center block, which has matching ports. As air is supplied to
      the air valve, differential pressure causes the piston to move up and down vertically. The vertical
      movement alternately supplies power ports with pressurized air. The ports then direct the air to
      the backside of the diaphragm. Air valve tolerances allow for the passage of some moisture and
      air line particles allowing free movement of the piston. All air valve components can be inspected
      without disassembling the pump.


      Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                              1                                                                             2002-12-16, 13:33
      SECTION 2
      PUMP DESIGNATION SYSTEM


                                    WLXX / XXXX / XX / XX / XX
                                             MODEL                                 VALVE SEAT
                                                                             VALVE BALLS
                                                                       DIAPHRAGMS
                                                                 AIR VALVE
                                                              CENTER BLOCK OR CENTER SECTION
                                                            AIR CHAMBERS OR CENTER SECTION
                                                           WETTED PARTS




      MATERIAL CODES
      MODEL SIZE                                     CENTER BLOCK                VALVE SEAT
      wl25 = 25mm Inlet                              A = ALUMINUM                A = ALUMINUM*
      wl40 = 38mm Inlet                                                          BN = BUNA-N (Red Dot)
      wl50 = 50mm Inlet                              AIR VALVE                   NE = NEOPRENE (Green Dot)
      wl80 = 76mm Inlet                              B = BRASS
                                                                                 VALVE SEAT O-RING
      WETTED PARTS                                   DIAPHRAGMS                  BN = BUNA-N**
      A = ALUMINUM                                   BN = BUNA-N (Red Dot)
      W = CAST IRON                                  NE = NEOPRENE (Green Dot)


      AIR CHAMBERS                                   VALVE BALL
      A = ALUMINUM                                   BN = BUNA-N (Red Dot)
      W = CAST IRON                                  NE = NEOPRENE (Green Dot)
      M = MILD STEEL




      *Aluminum valve seat for WL25 only.
      **Buna-N valve seat o-ring for WL25 only.

      WL25 available in aluminum wetted path only.

      NOTE: Neoprene and Buna-N elastomers are offered. Please specify
      materials based upon chemical compatibility, temperature, abrasion
      resistance and part life.

                                                                           1          Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                           1                                               2002-12-16, 13:33
       SECTION 3A
       DIMENSIONAL DRAWING
       WEI LI MODEL WL25
                                                                                                                    F
                                                      19.0mm(3⁄4”)BSP                                                                                  DIMENSIONS – WL40
                                                                                                                                               ITEM   METRIC (mm) STANDARD (inch)
                                                                                                                                                 A       267.5         10.53
                                                                                                                                                 B        36.5           1.43
                                                                                                                                                 C       138.0           5.43
                                                                                                                           12.7mm (1⁄2”)         D       254.0         10
                                                                                                                             FNPT AIR
                                                                                                                            EXHAUST              E       279.4         11
                                                                                        E
                                                                                    D                                                            F        28.6           1.12
                                                                                                                                                 G        95.3           3.75
      6.35mm (1⁄4”)
      FNPT Air Inlet                                                                                                                             H        77.0           3.03
                                                                            C
                                                                                                                                                 J       184.2           7.25
                                                                                                                                                 K       209.6           8.25
                                                                        B                                                                        L       171.5           6.75
                                                                                                                                                 M       106.4           4.18
                                           A                                                        G
                               25.4mm (1” )BSP                                                                                                   N       127.0           5
                                                                                                            H
                                                                                                                                                 P         7.9            .31
                                                                                                            K                                    R        31.8           1.25A
                                                                                                            L



                                                                                R
                                                                                                                                    M N




                                                                                                P




      SECTION 3B
      DIMENSIONAL DRAWING
      WEI LI MODEL WL40
                                       31.75mm (11⁄4”)BSP
                                                                                                                                                       DIMENSIONS – WL40
                                                                                                                                               ITEM   METRIC (mm) STANDARD (inch)
                                                                                                                                                 A       369.1           14.53
                                                                                                                                                 B        62.7            2.46
                                                                                                                        19.05mm (3⁄4”)           C       224.6            8.84
                                                                                                                          FNPT AIR
                                                                                                                          EXHAUST
                                                                                                                                                 D       454             17.87
                                                                                                                                                 E       287.4           11.31
       D                                                                                                                                         F       222              8.75
                                                                                                                                                 G       336             13.22
                                                                                                                                                 H        49              1.91
                                                                 C                                                                               J        13               .50
                                                                                                                                                 K       151              5.94
                                                                                                                                                 L       195              7.66
                                                            B

                                  A                                                                     E
           38.1mm (11⁄2”)BSP



                                                                                                                G
                                                                                                        F




                                                                                                                                           L
                                                                                                                                   K
                                                                                H




                                                                                            J




      Wei Li Pump (Shanghai) Co., Ltd.                                                              2



EOM.indd                                    2                                                                                                  2002-12-16, 13:33
      SECTION 3C
      DIMENSIONAL DRAWING
      WEI LI MODEL WL50
                                                                                                            G                        DIMENSIONS – WL40
                                                                                                            F                ITEM   METRIC (mm) STANDARD (inch)
                                50.8 mm (2”) BSP
                                                                                                                               A       404.0         15.90
                                                                                                                               B        47.6           1.87
                                                                                                                               C       628.7         24.75
                                                                                                                               D       669.2         26.34
                                                                                                                               E       359.6         14.15
                                                                                                                               F        57.2           2.25
                                                                                                                               G        61.7           2.43
                                                                                                                               H       270.7         10.65
                                                               D                                                               J       342.9         13.50
                                                       C
                                                                                                                               K       229.4           9.03
                                                                                                                               L       254.0         10
                                                                                                                               M       255.6         10.06
                                                                                  E
                                                                                                                               N       313.5         12.34
                                                                                                                         H     P        14.3            .56
                                                                                                                               R        63.5           2.50

                                           B

                       A                                                                             J

                               50.8 mm (2”) BSP INLET
               P

                                                                              50.8 mm (2”) BSP

           F                                           L
                                           K
                                                                                      R




                       M
                       N


      SECTION 3D
      DIMENSIONAL DRAWING
      WEI LI MODEL WL80
                               76.2 mm (3”) BSP
                                                                                                         F - CAST IRON               DIMENSIONS – WL40
                                                                                                         G - ALUM.
                                                                                                                             ITEM   METRIC (mm) STANDARD (inch)
                                                                                                                                A      505.2         19.90
                                                                                                                                B       59.5           2.34
                                                                                                                25.4 mm         C      760.6         29.96
                                                                                                                ( 1”) FNPT
                                                                  19.1 mm                                       EXHAUST         D      821.7         32.37
                                                               ( 3⁄4”) FNPT                                                     E      418.4         16.50
                                                                AIR INLET
                                                                                                                                F       71.4           2.81
                                                           D
                                                                                                                                G       68.3           2.68
                                               C
                                                                                                                                H      312.5         12.31
                                                                                                                                J      425.5         16.75
                                                                                                                                K      360.4         14.18
                                                                      E
                                                                                                                                L      304.8         12
                                                                                                                         H
                                                                                                                                M      257.8         10.15
                                                                                                                                N      281.8         11.09
                                       B
                                                                                                                                P       15.9            .62
                   A                                                                             J                              R       69.9           2.75
                                 76.2 mm (3”) BSP
                   K
                   L
                                                                          76.2 mm (3”) BSP


                                                   N
                                                                              R
                                      M




               P




                                                                                          3                                     Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                   3                                                                                                 2002-12-16, 13:33
       SECTION 4A
       PERFORMANCE CURVES
       WEI LI MODEL WL25
      Height ...................................27.94 cm (11”)
      Width .............................. 26.75 cm (1017/32”)
      Depth ...................................18.42 cm (71⁄4”)
      Ship Weight ......... Aluminum 12 kg (26 lbs.)
      Air Inlet ...................................6.35 mm (1⁄4”)
      Inlet..........................................25.4 mm (1”)
      Outlet ......................................19.1 mm (3⁄4”)
      Suction Lift .........................5.18 m Dry (17’)
      ........................................... 9.45 m Wet (31’)
      Displacement per
          Stroke ........................... .41 l (0.105 gal.)1
      Max. Flow Rate ........... 132.49 lpm (35 gpm)
      Max. Size Solids .................... 3.18 mm (1/8”)

      1
       Displacement per stroke was calculated at
      4.8 Bar (70 psig) air inlet pressure against a
      2 Bar (30 psig) head pressure.

      Example: To pump 68.1 lpm (18 gpm)
      against a discharge pressure head of 2.7
      Bar (40 psig) requires 4.1 Bar (60 psig)
      and 18.7 Nm3/h (11 scfm) air consumption.                        Flow rates indicated on chart were determined by pumping water.
      (See dot on chart.)
      Caution: Do not exceed 8.6 Bar (125 psig)                        For optimum life and performance, pumps should be specified so that daily operation parameters
      air supply pressure.                                             will fall in the center of the pump performance curve.


       SECTION 4B
       PERFORMANCE CURVES
       WEI LI MODEL WL40
      Height ............................. 454.0 mm (177/8”)
      Width ............................ 369.1 mm (1417/32”)
      Depth ............................. 287.4 mm (115/16”)
      Ship Weight ......Aluminum 17.5 kg (38 lbs.)
      ............................Cast Iron 26.2 kg (57 lbs.)
      Air Inlet ..................................12.7 mm (1⁄2”)
      Inlet......................................38.1 mm (11⁄2”)
      Outlet ...................................31.8 mm (11⁄4”)
      Suction Lift ...............................5.49 m (18’)
      ..................................................8.53 m (28’)
      Displacement per
          Stroke ......................... 1.02 l (0.27 gal.)1
      Max. Flow Rate ............ 287.7 lpm (76 gpm)
      Max. Size Solids ................. 31⁄416” (4.8 mm

      1
       Displacement per stroke was calculated at
      4.8 Bar (70 psig) air inlet pressure against a
      2 Bar (30 psig) head pressure.

      Example: To pump 113.6 lpm (30 gpm)
      against a discharge pressure head of 2.7
      Bar (40 psig) requires 4.1 Bar (60 psig)
      and 25.5 Nm3/h (15 scfm) air consumption.                        Flow rates indicated on chart were determined by pumping water.
      (See dot on chart.)
      Caution: Do not exceed 8.6 Bar (125 psig)                        For optimum life and performance, pumps should be specified so that daily operation parameters
      air supply pressure.                                             will fall in the center of the pump performance curve.


      Wei Li Pump (Shanghai) Co., Ltd.                                                      4



EOM.indd                                        4                                                                          2002-12-16, 13:33
      SECTION 4C
      PERFORMANCE CURVES
      WEI LI MODEL WL50
      Height ............................. 669.2 cm (261/32”)
      Width .............................404.0 cm (1529/32”)
      Depth ...................................254.0 cm (10”)
      Ship Weight ..... Aluminum 33.1 kg (72 lbs.)
      .........................Cast Iron 52.4 kg (114 lbs.)
      Air Inlet ................................. 19.1 mm (3⁄4”)
      Inlet.................................. 50.8 mm (2”)
      Outlet ............................... 50.8 mm (2”)
      Suction Lift....................6.4 m Dry (21’)
      ..........................................9.45 m Wet (31’)
      Displacement per
          Stroke .......................... 2.69 l (0.71 gal.)1
      Max. Flow Rate ........617.02 lpm (163 gpm)
      Max. Size Solids ................... 6.35 mm (1⁄4”)

      1
       Displacement per stroke was calculated at
      4.8 Bar (70 psig) air inlet pressure against a
      2 Bar (30 psig) head pressure.

      Example: To pump 318 lpm (84 gpm)
      against a discharge pressure head of 2.1
      Bar (30 psig) requires 4.1 Bar (60 psig)
      and 85 Nm3/h (50 scfm) air consumption.                      Flow rates indicated on chart were determined by pumping water.
      (See dot on chart.)
      Caution: Do not exceed 8.6 Bar (125 psig)                    For optimum life and performance, pumps should be specified so that daily operation parameters
      air supply pressure.                                         will fall in the center of the pump performance curve.

      SECTION 4D
      PERFORMANCE CURVES
      WEI LI MODEL WL80
      Height ............................810.6 cm (3115/16”)
      Width ...................................431.8 cm (17”)
      Depth .............................278.4 cm (1031/32”)
      Ship Weight ... Aluminum 53.4 kg (116 lbs.)
      ............................Cast Iron 92 kg (200 lbs.)
      Air Inlet ................................. 19.1 mm (3⁄4”)
      Inlet........................................ 76.2 mm (3”)
      Outlet ..................................... 76.2 mm (3”)
      Suction Lift ......................... 5.5 m Dry (18’)
      ..........................................9.45 m Wet (31’)
      Displacement per
          Stroke ............................ 5.3 l (1.40 gal.)1
      Max. Flow Rate ..........878.2 lpm (232 gpm)
      Max. Size Solids ................. 9.53 mm (31⁄4”)

      1
       Displacement per stroke was calculated at
      4.8 Bar (70 psig) air inlet pressure against a
      2 Bar (30 psig) head pressure.

      Example: To pump 530 lpm (140 gpm)
      against a discharge pressure head of 2.1
      Bar (30 psig) requires 4.1 Bar (60 psig)
      and 136 Nm3/h (80 scfm) air consumption.                     Flow rates indicated on chart were determined by pumping water
      (See dot on chart.)                                          .
      Caution: Do not exceed 8.6 Bar (125 psig)                    For optimum life and performance, pumps should be specified so that daily operation parameters
      air supply pressure.                                         will fall in the center of the pump performance curve.


                                                                                        5                                  Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                                      5                                                                        2002-12-16, 13:33
       SECTION 5
       INSTALLATION
      The suction pipe size should be equivalent in diameter or larger than        ELEVATION: Selecting a site that is well within the pump’s
      pump inlet porting if highly viscous material is being pumped. The           dynamic lift capability will assure that loss-of-prime trouble will
      suction hose must be non-collapsible, reinforced type as the pump            be eliminated.
      is capable of pulling a high vacuum. Discharge piping should be
      equivalent in diameter; larger diameter can be used to reduce friction       PIPING: Final determination of the pump site should not be made
      losses. It is critical that all fittings and connections are airtight or a   until the piping problems of each possible location have been
      reduction or loss of suction capability will result.                         evaluated.

      INSTALLATION: Months of careful planning, study, and selection The best choice possible will be a site involving the shortest and the
      efforts can result in unsatisfactory pump performance if installation straightest hook-up of suction and discharge piping. Unnecessary
      details are left to chance.                                           elbows, bends and fittings should be avoided. All piping should be
                                                                            supported independently of the pump. In addition, the piping should
      LOCATION: Noise, safety, and other logistical factors usually dictate be aligned so as to avoid placing stresses on the pump fittings.
      where equipment is situated on the production floor. Multiple
      installations with conflicting requirements can result in congestion Flexible hose can be installed to aid in absorbing the forces created
      of utility areas, leaving few choices for siting of additional pumps. by the natural reciprocating action of the pump. If the pump is to be
                                                                            bolted down to a solid foundation, a mounting pad placed between
      ACCESS: First of all, the location should be accessible. If it’s easy the pump and foundation will assist in minimizing pump vibration.
      to reach the pump, maintenance personnel will have an easier time
      carrying out routine inspections and adjustments.                     If the pump is to be used in a self-priming application, be sure that
                                                                            all connections are airtight and that the suction lift is within the
      AIR SUPPLY: Every pump location should have an air line large model’s ability.
      enough to supply the volume of air necessary to achieve the desired
      pumping rate. Use air pressure to a maximum of 8.6 Bar (125psig) When pumps are installed in applications involving flooded suction
      depending upon pumping requirements.                                  or suction head pressures, a gate valve should be installed in the
                                                                            suction line to permit closing of the line for pump service.




                                                                                                   To stop the pump from operating in an emergency situation, simply close
                                                                                                   the “shut-off” valve (user supplied) installed in the air supply line. A properly
                                                                                                   functioning valve will stop the air supply to the pump, therefore stopping output.
                                                                                                   This “shut-off” valve should be located far enough away from the pumping
                                                                                                   equipment such that it can be reached safely in an emergency situation.


      Wei Li Pump (Shanghai) Co., Ltd.                                         6



EOM.indd                             6                                                                              2002-12-16, 13:33
       SECTION 6A
       SUGGESTED OPERATION AND
       MAINTENANCE INSTRUCTIONS
      OPERATION: The pump is not pre-lubricated and may require in-line               MAINTENANCE AND INSPECTIONS: Since each application is unique,
      lubrication. Pump discharge rate can be controlled by limiting the              maintenance schedules may be different for every pump. Frequency of
      volume and/or pressure of the air supply to the pump (preferred                 use, line pressure, viscosity and abrasiveness of process fluid all affect
      method). An air regulator is used to regulate air pressure. A needle            the parts life of the pump. Periodic inspections have been found to offer
      valve is used to regulate volume. Pump discharge rate can also be               the best means for preventing unscheduled pump downtime. Personnel
      controlled by throttling the pump discharge by partially closing a valve        familiar with the pump’s construction and service should be informed of
      in the discharge line of the pump. This action increases friction loss          any abnormalities that are detected during operation.
      which reduces flow rate. This is useful when the need exists to control
      the pump from a remote location. When the pump discharge pressure               RECORDS: When service is required, a record should be made of
      equals or exceeds the air supply pressure, the pump will stop; no bypass        all necessary repairs and replacements. Over a period of time, such
      or pressure relief valve is needed, and pump damage will not occur.             records can become a valuable tool for predicting and preventing future
      The pump has reached a “deadhead” situation and can be restarted by             maintenance problems and unscheduled downtime. In addition, accurate
      reducing the fluid discharge pressure or increasing the air inlet pressure.     records make it possible to identify pumps that are poorly suited to their
      The pump runs solely on compressed air and does not generate heat,              applications.
      therefore your process fluid temperature will not be affected.
                                                                                      If the application media is prone to solidifying or crystallizing after the
                                                                                      pump is stopped, then the pump should be flushed and drained completely
                                                                                      upside down so that no application media remains in the pump. This is to
                                                                                      prevent damage to the inner/outer pistons, shaft, diaphragms and liquid
                                                                                      chamber when the pump is started again with a hardened, solidified or
                                                                                      crystallized substance in the pump liquid chamber.




      SECTION 6B
      TROUBLESHOOTING
      Pump will not run or runs slowly.                                               3. Check to make sure all suction connections are air tight, especially
      1. Check air inlet screen and air filter for debris.                               clamp bands around intake balls.
      2. Check for sticking air valve, flush air valve in solvent.                    Pump air valve freezes.
      3. Check for worn out air valve. If piston face in air valve is shiny instead   Check for excessive moisture in compressed air. Either install dryer or
         of dull, air valve is probably worn beyond working tolerances and            hot air generator for compressed air.
         must be replaced.
      4. Check center block Glyd™ rings. If worn excessively, they will not seal      Air bubbles in pump discharge.
         and air will simply flow through pump and out air exhaust. Use only          1. Check for ruptured diaphragm.
         Glyd™ rings as they are of special construction.                             2. Check tightness of clamp bands, especially at intake manifold.
      5. Check for rotating piston in air valve.
      6. Check type of lubricant being used. A higher viscosity oil than              Product comes out air exhaust.
         suggested may cause the piston to stick or run erratically. It is            1. Check for diaphragm rupture.
         suggested that oil with arctic characteristics (ISO 15-5 wt.) is used.       2. Check tightness of piston plates to shaft.

      Pump runs but little or no product flows.                                Pump rattles.
      1. Check for pump cavitation; slow pump speed down to match 1. Create false discharge head or suction lift.
         thickness of material being pumped.
      2. Check for sticking ball check valves. If material being pumped is not
         compatible with pump elastomers, swelling may occur. Replace ball
         check valves and O-rings with the proper elastomers.




                                                                                  7                                     Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                              7                                                                             2002-12-16, 13:33
      SECTION 8A
      DIRECTIONS FOR DISASSEMBLY
      /REASSEMBLY
      CAUTION: Before any maintenance or repair is attempted, the compressed wrench. Next, loosen diaphragm assembly by turning counter-clockwise.
      air line to the pump should be disconnected and all air pressure allowed to After removing outer piston, simply slide shaft from center section.
      bleed from the pump.                                                        Step 6: To remove diaphragm assembly from shaft, secure shaft in vice
                                                                                  equipped with soft jaws (a vice fitted with plywood or other suitable
      Step 1: Before starting the disassembly process, mark a line from each material). The use of soft jaws will help to avoid the shaft from being
      liquid chamber to its corresponding air chamber. This line will assist in damaged during this process. Inspect all parts for wear and replace if
      proper alignment during reassembly.                                         needed.
      Step 2: To remove discharge manifold, using the correct wrench for your Step 7: To reassemble pump, reverse order of disassembly instruction
      pump, remove appropriate fasteners. Next, remove the discharge manifold beginning with step 6 and working backwards until completing step 1.
      to expose the valve balls and seats (WL25, also remove valve seats).
      Inspect the ball cage area of the discharge manifold for excessive wear or Upon performing applicable maintenance to the air distribution system,
      damage. Remove the discharge valve balls and seats for nicks, gouges, the pump can now be reassembled. To reassemble the pump, follow
      chemical attack or abrasive wear.                                           the disassembly instructions in reverse order. The air distribution system
      Step 3: To remove the inlet manifold, using the correct wrench for your needs to be assembled first, then the diaphragms and finally the wetted
      pump, remove appropriate fasteners. Next, lift the inlet manifold away to path. Please find the applicable torque specification in section 8b.
      expose the valve balls and seats (WL25, also remove valve seats). Inspect
      valve ball cage area inlet manifold for excessive wear or damage. Remove • Clean the inside of the center section shaft bushing to ensure no damage
      the inlet balls and seats for nicks, gouges, chemical attack or abrasive      is done to new seals.
      wear.                                                                       • Stainless bolt threads should be lubed to reduce the possibility of seizing
      Step 4: To remove the liquid chamber from the center section, again using     during retightening.
      the correct wrench for your pump, remove appropriate fasteners. Next, • Ensure proper alignment on the sealing surfaces of the inlet and discharge
      lift liquid chamber aware from the center section to expose diaphragm and     manifolds.
      outer piston.                                                               • Liquid chambers are easier to attach when the diaphragm is inverted. Prior
      Step 5: To remove the diaphragm assembly from the center section, secure      to attaching the second water chamber, push diaphragm assembly so that
      both the right and left outer piston lug by either using a vice with or a     it is as close as possible to the center section.


      SECTION 8B
      TOOLS REQUIRED/
      TORQUE SPECIFICATIONS
                            WL25                                                                                         WL50
       Tools Required:                                                                               Tools Required:
       Adjustable Wrench                                                                             Adjustable Wrench
       9/16” Box Wrench                                                                              1/2” Box Wrench
       3/4 Box Wrench                                                                                9/16” Box Wrench
       Maximum Torque Specification:                                                                 11/16” Socket Wrench
       Air Valve                   3.4 N·m [30 in.-lbs.]                                             1” Box Wrench
       Outer Piston                 38 N·m [28 ft.-lbs.]
       Vertical Bolts             13 N·m [115 in.-lbs.]                                              Maximum Torque Specification:
                                                                                                     Air Valve                   9.6 N·m [85 in.-lbs.]
                                                                                                     Outer Piston              105.8 N·m [78 ft.-lbs.]
                                                                                                     Small Clamp Bands           2.8 N·m [25 in.-lbs.]
                                                                                                     Large Clamp Bands          47.4 N·m [35 ft.-lbs.]
                                                                                                     Center Block Assembly      31.1 N·m [23 ft.-lbs.]


                            WL40                                                                                          WL25
       Tools Required:                                                                               Tools Required:
       Adjustable Wrench                                                                             Adjustable Wrench
       1/2” Box Wrench                                                                               11/16” Box & Socket Wrenches
       3/8” Box Wrench                                                                               3/4” Box & Socket Wrenches
       3/16” Allen Wrench                                                                            Maximum Torque Specification:
       Maximum Torque Specification:                                                                 Air Valve                   9.6 N·m [85 in.-lbs.]
       Air Valve                   3.4 N·m [30 in.-lbs.]                                             Outer Piston              105.8 N·m [78 ft.-lbs.]
       Outer Piston               44.7 N·m [33 ft.-lbs.]                                             Inner Piston                 19 N·m [14 ft.-lbs.]
       Small Clamp Bands           3.4 N·m [30 in.-lbs.]                                             Small Clamp Bands           5.6 N·m [50 in.-lbs.]
       Large Clamp Bands          10.7 N·m [95 in.-lbs.]                                             Large Clamp Bands          47.4 N·m [35 ft.-lbs.]
       Center Block Assembly       8.5 N·m [75 in.-lbs.]                                             Center Block Assembly      31.1 N·m [23 ft.-lbs.]


      Wei Li Pump (Shanghai) Co., Ltd.                                          8



EOM.indd                             8                                                                            2002-12-16, 13:33
      SECTION 9
      AIR VALVE/CENTER SECTION
      MAINTENANCE
      The air valve assembly consists of both the air valve body, air valve        Small nicks can usually be dressed out and the piston returned to service.
      piston and center block. The unique design of the air valve relies on        Make sure that the guide pin is straight and smooth or the piston will not
      differential pressure to effect the diaphragm shift. It is reliable and      move freely in the air valve bore. Clean anti-centering pin holes located at
      simple to maintain. The bushing in the center block, along with the          each end of the piston. Pin holes are located on each side of the annular
      diaphragm shaft, provides the “signal” to tell the air valve to shift. The   groove on the top of the piston and travel to each end. To ease assembly
      following procedure will ensure that the air valve on your pump will         when installing air valve end caps, lubricate the end cap o-rings. When
      provide long trouble-free service.                                           installing air valve end caps, ensure that proper alignment of the piston
                                                                                   and air valve ports are maintained (see figure B). Reinstall air valve to
      AIR VALVE BODY AND PISTON ASSEMBLY AND DISASSEMBLY:                          center block of pump. Tighten per the torque specification in section 8.
      The air valve body and piston can be disconnected from the pump by
      removing the four socket head cap screws which attach it to the center       CENTER BLOCK GLYD™ RING REPLACEMENT:
      block. The piston in the air valve is aluminum with a dark gray anodized     When the Glyd™ rings become worn, they will no longer seal and must
      coating. The piston should move freely and the ports in the piston           be replaced. Due to the design characteristics of the Glyd™ rings,
      should line up with the ports on the face of the air valve body. The         caution must be taken in order to not damage the seals.
      piston should also appear to be dull and dark gray in color. If the piston
      appears to be a shiny aluminum color, the air valve is probably worn         CENTER BLOCK ASSEMBLY:
      beyond working tolerance and should be replaced. If the piston does          The pump’s center block consists of an aluminum die cast housing with
      not move freely in the air valve, the entire air valve should be immersed    a cast-in bronze bushing. The bushing has eleven grooves cut on the
      in a cleaning solution. If the air valve piston does not move freely after   inside diameter. There are seven Glyd™ rings that fit in these grooves
      the above cleaning, the air valve should be disassembled as follows:         (see figure C for WL40, WL50 & WL80) (see section D for WL25). Since
      Remove the snap ring from the top end of the air valve and apply a           these Glyd™ rings form a part of the shifting function of the pump, it
      small amount of compressed air from an air nozzle to the hole on the         is necessary that they are located in the proper grooves. When bushing
      opposite end of the air valve face (see figure A). CAUTION: The air valve    wear becomes excessive, a new center block must be used.
      end cap may come out with considerable force. Hand protection such as
      a padded glove or rag should be used to capture the end cap.




                                                             Figure A                                                                             Figure C




                                                            FIGURE B                                                                              Figure D




                                                                               9                                      Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                             9                                                                           2002-12-16, 13:33
      SECTION 10A
      EXPLODED VIEW/PARTS LISTING

           WL25

                                              26
                                              25



                                                   19




                                                                            22
                                                                            23
                                                                            24




                                                        22




      Wei Li Pump (Shanghai) Co., Ltd.   10



EOM.indd                       10                       2002-12-16, 13:33
                                                                                    WL25/AMABe9
      WEI LI WL25                                                                           2 5 /
                                                                                    N: W L A A A B


                                                                    Qty.                       WL25/
                                                                     Per                   AMAB
              Item           Description                            Pump                     P/N
                1            Air Valve Assembly1                      1                  25-2000-07
                2            Air Valve Cap wo/Guide (Bottom)         1                  25-2331-23
                3            Air Valve Cap w/Guide (Top)             1                  25-2301-23
                4            Snap Ring                               2                  25-2650-03
                5            Air Valve Cap O-Ring                    2                25-3200-52-200
                6            Air Valve Gasket — Buna-N               1                  25-2600-52
                7            Center Section1                         1                25-3150-01-225
                8            Muffler Plate                           1                  25-3180-01
                9            Muffler Plate Gasket — Buna-N           1                25-3500-52-110
               10            Air Valve Screws 1⁄4-20 x 6”            4                  25-6000-08
               11            Center Section Glyd™ Ring               4                25-3210-55-225
               12            Shaft                                   1                 25-3800-03-07
               15            Pistons — Inner                         2                  25-3700-08
               16            Diaphragm - Neoprene                    2                  25-1010-51
               16            Diaphragm - Buna-N                      2                   25-1010-52
               17            Pistons — Outer                         2                   25-4550-01
               18            Liquid Chamber                          2                   25-5000-01
               19            Discharge Manifold                      1                   25-5020-01
               20            Inlet Housing                           1                   25-5080-01
               21            Manifold Bolt 3/8”-16 x 81⁄2”           4                   25-6080-08
               22            Valve Balls                             4                   25-1080-51
               22            Valve Balls                             4                   25-1080-52
               23            Valve Seat                              4                   25-1120-01
               24            Valve Seat O-Ring                       4                   25-1200-52
               25            Manifold Bolt Washer 3/8”               4                   80-6720-08
               26            Manifold Bolt Nut 3/8”-16               4                   25-6430-08
      1
          Air Valve Assembly includes items 2 through 5.

      All boldface items are primary wear parts.




                                                               11             Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                               11                                  2002-12-16, 13:33
      SECTION 10B
      EXPLODED VIEW/PARTS LISTING

           WL40




                                                   19




                                              22




      Wei Li Pump (Shanghai) Co., Ltd.   12



EOM.indd                       12                       2002-12-16, 13:33
      WEI LI WL40                                                                      WL25/AMABe9   WL25/AMABe9
                                                                                               4 0    B
                                                                                       N: W L A M /A N: W L 4 0 / W M A B

                                                                                Qty.            WL25/                       WL25/
                                                                                Per             AMAB                        AMAB
           Item          Description                                           Pump             P/N                         P/N
             1           Air Valve1                                              1          40-2000-07                  40-2000-07
             2           Air Valve Screen                                        1          40-2500-07                  40-2500-07
             3           Air Valve Cap w/Guide (Top)                             1          40-2300-23                  40-2300-23
             4           Air Valve Cap w/o Guide (Bottom)                        1          40-2330-23                  40-2330-23
             5           Snap Ring                                               2          40-2650-03                  40-2650-03
             6           Air Valve Cap O-Ring                                    2          40-2390-52                  40-2390-52
             7           Air Valve Gasket — Buna-N                               1          40-2600-52                  40-2600-52
            10           Center Section/Block                                    1        40-3100-01-225              40-3100-01-225
            11           Glyd™ Ring                                              7        50-3210-55-225              50-3210-55-225
            12           Block Gasket                                            2          40-3520-30                  40-3520-30
            13           Shaft                                                   1        40-3800-09-07               40-3800-09-07
            14           Shaft Stud                                              2         40-6150-08                  40-6150-08
            15           Piston, Outer                                           2         40-4552-01                  40-4552-01
            16           Piston, Inner                                           2         40-3700-08                  40-3700-08
            17           Air Chamber                                             2         40-3650-08                  40-3650-08
            18           Liquid Chamber                                          2         40-5000-01                  40-5000-01                40-5000-02
            19           Clamp Band (Large)                                      2          40-7300-08                  40-7300-08
            20           Clamp Band (Small)                                      4          40-7100-08                  40-7100-08
            21           Discharge Manifold                                      1          40-5020-01                  40-5020-02
            22           Inlet Housing                                           1          40-5080-01                  40-5080-02
            23           Air Valve Cap Screw                                     4          40-6000-08                  40-6000-08
            24           Hex Head Cap Screw 1⁄4”-20 x 3”                         3          40-6130-08                  40-6130-08
            25           Hex Head Nut 1⁄4”-20                                    3          40-6400-08                  40-6400-08
            26           Diaphragm - Neoprene                                    2          40-1010-51                  40-1010-51
            26           Diaphragm - Buna-N                                      2          40-1010-52                  40-1010-52
            27           Valve Ball - Neoprene                                   4          40-1080-51                  40-1080-51
            27           Valve Ball - Buna-N                                     4          40-1080-52                  40-1080-52
            28           Valve Seat - Neoprene                                   4          40-1120-51                  40-1120-51
            28           Valve Seat - Buna-N                                     4          40-1120-52                  40-1120-52
            29           Large Clamp Band Bolt 5/16”-18 x 21⁄4”                  4          40-6070-08                  40-6070-08
            30           Large Hex Nut 51⁄416”-18                                4          40-6420-08                  50-6400-08
            31           Small Clamp Band Bolt 1⁄4”-20 x 13⁄4”                   8          40-6050-08                  40-6070-08
            32           Small Hex Nut 1⁄4”-20                                   8          40-6400-08                  40-6400-08
      1
       Air Valve Assembly includes items 2–6.

      NOTE: Cast iron pumps require a reinforcing washer (P/N 40-6800-08) between the outer piston (P/N 40-4550-08) and bolt (P/N 40-6090-08).

      All boldface items are primary wear parts.



                                                                        13                                  Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                           13                                                                   2002-12-16, 13:33
      SECTION 10C
      EXPLODED VIEW/PARTS LISTING

           WL50

                                                   22




                                              25



                                              26




                                24




      Wei Li Pump (Shanghai) Co., Ltd.   14



EOM.indd                       14                   2002-12-16, 13:33
      WEI LI WL50                                                           WL25/AMABe9  WL25/AMAMe9
                                                                                         N: W
                                                                            N: W L 5 0 / A A AL B5 0 / W W A B

                                                                     Qty.        WL25/                    WL25/
                                                                     Per         AMAB                     AMAB
           Item          Description                                 Pump         P/N                     P/N
             1           Air Valve Assembly1                           1      50-2000-07              50-2000-07
             2           Air Valve Screen                              1      50-2500-07              50-2500-07
             3           Air Valve End Cap w/Guide (Top)              1       50-2300-23              50-2300-23
             4           Air Valve End Cap w/o Guide (Bottom)         1       50-2330-23              50-2330-23
             5           Air Valve Snap Ring                          2       50-2650-03              50-2650-03
             6           Air Valve Cap O-Ring                         2       50-2390-52              50-2390-52
            10           Air Valve Gasket — Buna-N                    1       50-2600-52              50-2600-52
            11           Air Valve Screw 5/16”-18 x 21⁄4”             4        50-6000-08            50-6000-03
            12           Center Block                                 1      50-3100-01-225        50-3100-01-225
            13           Center Block Glyd™ Ring                      7      50-3210-55-225        50-3210-55-225
            14           Block Gasket — Buna-N                        2       50-3520-52              50-3520-52
            15           Shaft                                        1      50-3800-09-07          50-3800-09-07
            16           Piston, Outer                                2       50-4550-01             50-4550-02
            17           Piston, Inner                                2       50-3700-01              50-3700-01
            18           Air Chamber, Counter Sunk                    2       50-3650-01              50-3650-02
            19           Air Chamber Screw 3/8”-16 x 39/16”           3       50-6200-08              50-6200-08
            20           Air Chamber Cone Nut 33/8”-16                3       50-6550-08              50-6550-08
            21           Liquid Chamber                               2       50-5000-01              50-5000-02
            22           Discharge Manifold                           1       50-5020-01              50-5020-02
            23           Inlet Housing for Footed Base                1       50-5080-01              50-5080-02
            24           Diaphragm - Neoprene                         2       50-1010-51              50-1010-51
            24           Diaphragm - Buna-N                           2       50-1010-52              50-1010-52
            25           Valve Ball - Neoprene                        4       50-1080-51              50-1080-51
            25           Valve Ball - Buna-N                          4       50-1080-52              50-1080-52
            26           Valve Seat - Neoprene                        4       50-1120-51              50-1120-51
            26           Valve Seat - Buna-N                          4       50-1120-52              50-1120-52
            27           Large Clamp Band Assy.                       2       50-7300-08              50-7300-08
            28           Large Carriage Bolt 3/8”-16 x 3”             4       50-6120-08              50-6120-08
            29           Large Hex Nut 3/8”-16                        4       50-6450-08              50-6450-08
            30           Small Clamp Band Assy.                       4       50-7100-08              50-7100-08
            31           Small Hex Head Cap Screw 5/16”-18 x 13/8”    8       50-6050-08              50-6050-08
            32           Small Hex Nut 5/16”-18                       8       40-6420-08              40-6400-08
      1
       Air Valve Assembly includes items 2–6.

      All boldface items are primary wear parts.




                                                                15                         Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                           15                                                 2002-12-16, 13:33
      SECTION 10D
      EXPLODED VIEW/PARTS LISTING




      Wei Li Pump (Shanghai) Co., Ltd.   16



EOM.indd                       16             2002-12-16, 13:33
      WEI LI WL80                                                                          WL25/AMABe9  WL25/AMABe9
                                                                                                        N: W
                                                                                           N: W L 8 0 / A A AL B8 0 / W W A B

                                                                                    Qty.        WL25/                    WL25/
                                                                                    Per         AMAB                     AMAB
           Item           Description                                               Pump         P/N                     P/N
              1           Air Valve Assembly1                                         1      80-2000-07              80-2000-07
              2           Air Valve Screen                                           1       80-2500-07              80-2500-07
              3           Air Valve End Cap with Guide (Top)                         1       80-2300-23              80-2300-23
              4           Air Valve End Cap without Guide (Bottom)                   1       80-2330-23              80-2330-23
              5           Air Valve Snap Ring                                        2       80-2650-03              80-2650-03
             6            Air Valve Cap O-Ring                                       2       80-2390-52              80-2390-52
            10            Air Valve Gasket — Buna-N                                  1       80-2600-52              80-2600-52
            11            Air Valve Screw 5/16”-18 x 21⁄4”                           4        80-6000-08            80-6000-08
            12            Center Block                                               1      80-3100-01-225        80-3100-01-225
            13            Center Block Glyd™ Ring                                    7      80-3210-55-225        80-3210-55-225
            14            Block Gasket — Buna-N                                      2        80-3520-52            80-3520-52
            15            Shaft                                                      1      80-3800-09-07          80-3800-09-07
            16            Piston, Outer                                              2       80-4550-01             80-4550-02
            17            Piston, Inner                                              2       80-3700-01              80-3700-01
            18            Washer, Inner Piston Back-up                               2       80-6850-08              80-6850-08
            19            Piston Assembly — Bolt2 3/8”-16 x 11/8”                    12      80-6130-08              80-6130-08
                          Washer, Flat (Not shown)                                   12      80-6720-08              80-6720-08
            20            Air Chamber                                                2       80-3650-01              80-3650-02
            21            Air Chamber Screw 3/8”-16 x 4”                             4       80-6200-08              80-6200-08
            22            Air Chamber Cone Nut 3/8”-16                               4       50-6550-08              50-6550-08
            23            Liquid Chamber                                             2       80-5000-01              80-5000-02
            24            Discharge Manifold                                         1       80-5020-01              80-5020-02
            25            Inlet Housing for Footed Base                              1       80-5080-01              80-5080-02
            26            Diaphragm - Neoprene                                       2       80-1010-51              80-1010-51
            26            Diaphragm - Buna-N                                         2       80-1010-52              80-1010-52
            27            Valve Ball - Neoprene                                      4       80-1080-51              80-1080-51
            27            Valve Ball - Buna-N                                        4       80-1080-52              80-1080-52
            28            Valve Seat - Neoprene                                      4       80-1120-51              80-1120-51
            28            Valve Seat - Buna-N                                        4       80-1120-52              80-1120-52
            29            Large Clamp Band Assy.                                     2       80-7300-08              80-7300-08
            30            Large Carriage Bolt 1⁄2”-13 x 31⁄2”                        4       80-6120-08              80-6120-08
            31            Large Hex Nut 1⁄2”-13                                      4       80-6420-08              80-6420-08
            32            Small Clamp Band Assy.                                     4       80-7100-08              80-7100-08
            33            Small Carriage Bolt 3/8”-16 x 2”                           8       80-6050-08              80-6050-08
            34            Small Hex Nut 3/8”-16                                      8       50-6450-08              50-6450-08
      1
       Air Valve Assembly includes items 2–7.
      2
       Piston Assembly bolt (P/N 15-6130-08) utilizes a 3/8” washer (15-6720-08).

      All boldface items are primary wear parts.

                                                                           17                             Wei Li Pump (Shanghai) Co., Ltd.



EOM.indd                            17                                                               2002-12-16, 13:33
       CAUTIONS
           TEMPERATURE LIMITS:                                                    CAUTION: Blow out air line for 10 to 20 seconds before
           Neoprene                –17.8°C to 93.3°C        0°F to 200°F          attaching to pump to make sure all pipe line debris is clear. Use
           Buna-N                  –12.2°C to 82.2°C       10°F to 180°F          an in-line air filter. A 5µ (micron) air filter is recommended.
                                                                                  WARNING: Tighten all clamp bands and retainers prior to
           CAUTION: When choosing pump materials, be sure to check                installation. Fittings may loosen during transportation.
           the temperature limits for all wetted components. Example:             NOTE: Before starting disassembly, mark a line from each
           Neoprene has a maximum limit of 93.3°C (200°F) but Buna-N              liquid chamber to its corresponding air chamber. This line will
           has a maximum limit of only 82.2°C (180°F).                            assist in proper alignment during reassembly.
           CAUTION: Maximum temperature limits are based upon                     CAUTION: Verify the chemical compatibility of the process and
           mechanical stress only. Certain chemicals will significantly           cleaning fluid to the pump.
           reduce maximum safe operating temperatures. Consult
                                                                                  CAUTION: When removing the end cap using compressed air,
           engineering guide for chemical compatibility and temperature
                                                                                  the air valve end cap may come out with considerable force.
           limits.
                                                                                  Hand protection such as a padded glove or rag should be used
           CAUTION: Always wear safety glasses when operating pump.               to capture the end cap.
           When diaphragm rupture occurs, material being pumped may
                                                                                  NOTE: Wei Li Air-operated pumps must be lubricated. Wei Li
           be forced out air exhaust.
                                                                                  suggests an arctic 5 weight oil. Do not over-lubricate pump.
           WARNING: Prevention of static sparking — If static sparking            Over-lubrication will reduce pump performance.
           occurs, fire or explosion could result. Pump, valves, and
           containers must be properly grounded when handling
           flammable fluids and whenever discharge of static electricity
           is a hazard.
           CAUTION: Do not exceed 8.6 Bar (125 psig) air supply
           pressure.
           CAUTION: Before any maintenance or repair is attempted, the
           compressed air line to the pump should be disconnected and all
           air pressure allowed to bleed from pump. Disconnect all intake,
           discharge and air lines. Drain the pump by turning it upside
           down and allowing any fluid to flow into a suitable container.




                                           Wei Li Pump (Shanghai) Co., Ltd.
                             Gao Xin City • East Section, 5F Bldg. 2 •288 Fu Te Road N. • Shanghai, P.R. China 200131
                                  Phone: 86.21.5868.0539 • Fax: 86.21.5868.0537 • e-mail: sales@weilipump.com
                                                                www.weilipump.com




EOM.indd                         18                                                                   2002-12-16, 13:33
                   Service
           WL25         Manual

           WL40



           WL50



           WL80




EOM.indd      19         2002-12-16, 13:33

				
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