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					PRA_MRK_001-02-English.ppt
                             MRK Multiple Circuit Pumps




MRK
Multiple Circuit
Radial Piston Pumps
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PRA_MRK_001-02-English.ppt
                                                                  MRK Multiple Circuit Pumps
Applications
•    Synchronised lifting systems. If high precision is not required, the fitting of an MRK instead of a path
     measurement system reduces complexity and costs dramatically.

•    Multiple tool systems, where each tool has to work at a given speed.

•    LP-HP-two-
     LP-HP-two-stage systems,
     for fast advance in low pressure and high pressure for the slow working stroke.

•    Hydraulic systems with continuous feed into
     two or more circuits with different flow rates and/or pressures.

•    Hydraulic systems with two or more circuits with identical flow rate and pressure, e. g. test benches.

•             multi-
     Where a multi-circuit pump has to fit in tight space:
     no external leads to join pistons to a circuit, no piggyback pump.

•    Can you think of more applications?...



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PRA_MRK_001-02-English.ppt
                                                                        MRK Multiple Circuit Pumps


MRK types

                                 01 11                02 12                03             14              15
Shaft                               Cylindrical shaft with key               Hollow shaft with key opening

                                                                            Integrated, dimensions fitting to
Bell housing and coupling                 Not included
                                                                            electric motor of required power
                                                          custom-
                             Pressure flange and cover custom-drilled            Stock components,
Standard vs. custom parts
                                      to fulfil specifications                  assembled just in time

Number of circuits                          2 … 12                                      2 … 6

Displacement per circuit              0.16 … 5.43 cm3/rev                       0.16 … 0.90 cm3/rev

Max. operating pressure              700 bar or 1000 bar                                700 bar

Costs                                         High                                        Low

Delivery time                             min. 4 weeks                                ca. 1 week



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PRA_MRK_001-02-English.ppt
                              MRK Multiple Circuit Pumps


                             MRK02 / MRK12




     MRK01 / MRK11

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PRA_MRK_001-02-English.ppt
                                                           MRK Multiple Circuit Pumps
MRK01 / MRK11
•Outer ø 160 mm
•Male shaft ø 20 f7                                                   •Pressure ports: radial, 1/4”
                                                                      •Suction port: axial, 3/8” or 1/2”
•Max. 2000 rpm




                             Bearings
                             •MRK01: ball bearings
                                   0
                             •MRK11: roller bearings
                                   1
                             •Bearing life: min. 1500 h at 1500 rpm




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PRA_MRK_001-02-English.ppt
                                                    MRK Multiple Circuit Pumps
MRK02 / MRK12
                                                          •Pressure ports: radial, 1/4”
•Outer ø 200 mm                                           •Suction port: axial, 1/2”
•Male shaft ø 30 f7
•Max. 2000 rpm




                             Bearings
                                   0
                             •MRK02: ball bearings
                             •MRK12: roller bearings
                                   1
                             •Bearing life: min. 1500 h
                              at 1500 rpm



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PRA_MRK_001-02-English.ppt
                                                                           MRK Multiple Circuit Pumps
•     Design based on the BRK Type A, most parts standard excepted:
•                      custom-
      Pressure flange custom-bored or custom made to distribute
      the flow from the cylinders into separate circuits.
•              custom-
      housing custom-drilled, according to the number and type of cylinders fitted.
•     Combination of different flows and pressures possible.
•     All connecting leads internal, no external piping required.




                                                              8 pistons
                                       5 pistons              2 circuits
                                       4 circuits




     MRK11-1.25-300-0.51-700-
     MRK11-1.25-300-0.51-700-                                                     MRK12-3.6-700-3.6-700-
                                                                                  MRK12-3.6-700-3.6-700-P-A*00
     0.51-700-0.51-700-
     0.51-700-0.51-700-P-A*00



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PRA_MRK_001-02-English.ppt
                                                                        MRK Multiple Circuit Pumps
Pulsation
•    Up to now, the MRK01/11 and 02/12 pumps were not
     optimised for minimum pulsation, as the cylinders of each
     circuit were grouped together.                                       Actual design
                                                                          6 drilled leads
•    Pulsation can be minimised by distributing the cylinders of            in 1 level
     each circuit evenly around the pump’s circumference and
     improved further by fitting more cylinders per circuit.

•    To lead the flows out, it is necessary to drill the leads in the
     pressure flange on two or more levels.                                                 MRK12 with 2 x 4-cylinder circuits

•    This requires a thicker flange and rises the price.

•                                    customer’
     From now on, BIERI will fit the customer’s specification into a       New design
     symmetrical cylinder layout optimised for low pulsation.            optimised for
                                                                          low pulsation
                                                                         8 drilled leads
• To quote properly, we have to know if                                     on 2 levels
                                customer’
  pulsation is an issue for the customer’s
  application.


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PRA_MRK_001-02-English.ppt                           MRK Multiple Circuit Pumps
Cylinder Elements
  Piston diameter
       [mm]                  ø5      ø6      ø8       ø9      ø 10 ø 12
     Displacement
       [cm3/rev]
                             0.157   0.226   0.420    0.509    0.628   0.905
Max. pressure [bar]


                                             700                       550

Max. pressure [bar]


                                        1000                  900      880


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PRA_MRK_001-02-English.ppt
                                                                  MRK Multiple Circuit Pumps

                                       Maximum number
                                           of cylinders
                                                                        Max. 12
                                                                         up to
                             Max. 8                                     700 bar
                              up to
                             700 bar     IMPORTANT:
                                         The bearings of the pump
                                         must not be overloaded!
                                         This means that the combined              MRK02/12
         MRK01/11                        forces resulting from the
                                         specified displacements and
                                         pressures have to be checked
                                         by BIERI.
                              Max. 6                                     Max. 8
                               up to                                      up to
                             1000 bar                                   1000 bar




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PRA_MRK_001-02-English.ppt
                             MRK Multiple Circuit Pumps

MRK03 / MRK14 / MRK 15




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 PRA_MRK_001-02-English.ppt
                                                     MRK Multiple Circuit Pumps
MRK03 / MRK14 / MRK15
•Housing and hollow shaft adapted to
 electric motor of suitable power with
 B5-flange.                                          100 LA
                                                                     132 S
                                                     100 LB
                                                                     132 M
•Installation integrated into the lid of             112 M
 the hydraulic fluid tank or with a washer
 between pump and motor.                     90 S
                                             90 L
•Only one shaft bearing, on the pressure
 flange side. Shaft loads on the motor’s
 side are taken by the latter’s bearings.
•Bearing life: min. 1500 h at 1500 rpm.
 Bearing

 Max.
•Max. 2000 rpm.
 (3600 rpm available, not standard).

•Pressure up to 700 bar.
•1 Piston per circuit
 1                         PULSATIONS!       MRK03
                                                     MRK14
•From 2 to max. 6 pressure circuits.
 From                                                                MRK15



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PRA_MRK_001-02-English.ppt
                                   MRK Multiple Circuit Pumps
Build-
Build-Up                                          Flange for
                                                    3 or 6
                                                  cylinders
The stock housings (3 types) are
finished by drilling to fit the
                                                  Flange for
number of cylinders.
                                                    2 or 4
                                                  cylinders


                                                  Flange for
  MRK03 shaft and housing                             5
                                                  cylinders



  MRK14 shaft and housing


                                       2 to 6
                                      cylinders
  MRK15 shaft and housing




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 PRA_MRK_001-02-English.ppt                               MRK Multiple Circuit Pumps
 Cylinder Elements
   Piston diameter
        [mm]                  ø5      ø6             ø8    ø9         ø 10 ø 12
     Displacement
       [cm3/rev]
                              0.157   0.226      0.420     0.509      0.628        0.905
 Max. pressure [bar]


                                              1000                      900         880




• Even if the cylinders would allow higher pressures, the shaft and bearings used in the
  MRK03/14/15 have been designed for a max. pressure of 700 bar.

• The specified displacement, pressure and number of circuits give the power required.
  It is the corresponding standard motor that defines the pump as an MRK03, 14 or 15.



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    PRA_MRK_001-02-English.ppt
                                                                    MRK Multiple Circuit Pumps
    MRK03                           Bearings
                                     MRK0
                                    •MRK03 eccentric ring: ball bearing
                                     MRK
                                                                                     2 ports
                                    •Shaft bearing in flange: ball bearing
                                    •Motor bearing functions as the other
              90S
                                     shaft bearing
              90L
            B5-
            B5-flange               •Bearing life: min. 1500 h at 1500 rpm
                                                                                     3 ports




                                                                                     4 ports




                                                                                     5 ports
                                             •Pressure up to 700 bar
•Housing and hollow shaft adapted            •1 Piston per circuit     PULSATIONS!
 to suitable electric motor.                 •Pressure ports: axial, 3/8”
                                             •Suction port: axial, 1/2”




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    PRA_MRK_001-02-English.ppt
                                                                    MRK Multiple Circuit Pumps
    MRK14                           Bearings
                                     MRK1
                                    •MRK14 eccentric ring: roller bearing
                                     MRK
             100LA                                                                   2 ports
                                    •Shaft bearing in flange: ball bearing
             100LB
                                    •Motor bearing functions as the other
             112M
                                     shaft bearing
            B5-
            B5-flange
                                    •Bearing life: min. 1500 h at 1500 rpm
                                                                                     3 ports




                                                                                     4 ports




                                                                                     5 ports
                                             •Pressure up to 700 bar
                                             •1 Piston per circuit     PULSATIONS!
                                             •Pressure ports: axial, 3/8”
•Housing and hollow shaft adapted
                                             •Suction port: axial, 1/2”              6 ports
 to suitable electric motor.




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   PRA_MRK_001-02-English.ppt
                                                                    MRK Multiple Circuit Pumps
   MRK15                            Bearings
                                    •MRK15 eccentric ring: roller bearing
                                     MRK1
                                     MRK
            132S
            132M                    •Shaft bearing in flange: ball bearing
           B5-flange
           B5-                      •Motor bearing functions as the other
                                     shaft bearing
                                    •Bearing life: min. 1500 h at 1500 rpm
                                                                                       3 ports




                                                                                       4 ports




                                                                                       5 ports
                                             •Pressure up to 700 bar
                                              (less in the bigger pumps)
                                             •1 Piston per circuit       PULSATIONS!
•Housing and hollow shaft adapted
 to suitable electric motor.                 •Pressure ports: axial, 3/8”              6 ports
                                             •Suction port: axial, 1/2”



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PRA_MRK_001-02-English.ppt
                                                      MRK Multiple Circuit Pumps




                      a swiss name for hydraulics
                                 BIERI Hydraulik AG
                                 Könizstrasse 274
                             3097 Liebefeld Switzerland
                              Tel. + 41 31 970 09 09
                              www.bierihydraulics.com




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