626 Flow Switch by lindayy

VIEWS: 58 PAGES: 4

More Info
									 01052 99                                    Flow switch
           GB



Series 626

AISI 316
stainless steel
bellows unit
with
microplasm
welding

Protection class:
IP 54

Microswitch
protection and
flow switch
cover made of
self-extinguishing
polycarbonate




       ISO 9001
Quality Assured Firm




                       CALEFFI
                       Heating & Plumbing Components
Applications                                                             Example of the use of the flow switch on a hot water system

The flow switch is used when the presence or lack of flow in various     The flow switch is used on systems for providing instant hot water
types of systems must be detected:                                       with heat exchangers to control the pump and enable water to be
-   heating systems;                                                     circulated in the primary circuit of the heat exchanger when hot
-   air conditioning systems;                                            water is required.
-   hot water systems with instantaneous heat exchangers;
-   pumping systems;
-   water treatment systems;
-   additive inlet systems;
                                                                                                                       F
-   process systems and plants in general.
It carries out the following functions:
- control of the following items of equipment:
  pumps, burners, compressors, refrigerators, motorized valves;
- activation of signalling units;
- activation of warning devices;
- regulation of equipment for metering water additives.

                                                                         Design characteristics
Example of its use on heating systems
                                                                         The part subjected to the greatest stress in the flow switch is the
On heating systems the flow switch is used to cause the burner to        metal bellows unit which separates the electrical from the hydraulic
switch off whenever it is inadequate or there is no circulation of the   components. To make them stronger and more reliable and so that
vector fluid in the boiler circuit.                                      they can be used with every type of fluid the bellows unit and the
The lack of circulation or inadequate circulation would jeopardise       parts connected to it are made completely of stainless steel.
the use of safety and protection devices which are sensitive to the      The TIG method of welding is used to weld the bellows unit to the
temperature such as thermostats, thermal discharge valves and            control rod.
fuel isolation valves.
                                                                         The insulating protective cover over the microswitch avoids the
                                                                         danger of accidental contacts during the calibration operation.
                                                                         With protection class IP 54 the valve can be used in particularly
                                                                         humid and dusty environments.
                                                                         With the electric contact in changeover mode any electrical device
                                                                         within range of use can be activated or disconnected as required.
                                                                         The point of operation
                      F                                                  can easily be regulated
                                                                         with the calibration
                                                                         screw.




Example of the use of the flow switch on a cooling system

A useful application of the flow switch is generally on machines
where the circulation of the water is considered essential for the
correct operation of the items of equipment themselves.
A typical example is represented by the refrigerator unit shown in
the illustration.

    COMPRESSOR                      F

                                 SECONDARY
                  CONDENSER
                                 CONDENSER
                                                                         - The body and
                   EXPANSION                                               control rod are made
                        VALVE
                                    F               POINT OF USE
                                                                           of P-Cu Zn40 Pb2 brass.
                  EVAPORATOR     SECONDARY                               - The bellows unit is made
                                 EVAPORATOR                                of AISI 316L stainless steel.
                                                                         - The internal supports, sliding
                                                                           bars and bolts and screws are
                                                                           made of AISI 304 stainless
                                                                           steel.
The two flow switches are operated to interrupt the operation of the     - The sealing O-Ring between the
compressor if one of the following conditions should occur:                body and bellows unit carrier is
- inadequate or no cooling water flow in the condenser (danger of          made of EPDM.
  overheating);
- inadequate or no cooled water flow (danger of the formation of         - The microswitch protection and
  ice on the evaporator and the return of liquid to the compressor         cover are made of Class V-0
  intake).                                                                 self-extinguishing polycarbonate.
General data                                                                Electrical data

Maximum operating pressure:                                   10 bar        Voltage:                                                                                     240 V
Maximum temperature of the fluid:                             120°C         Current strength:                                                                          15 (7) A
Minimum temperature of the fluid:                              -30°C        Protection class:                                                                             IP 54
Maximum ambient temperature:                                    55°C        Mark:
Pipe connection:                                                   1”
Can be used with the following pipes:                   from 1” to 8”


                                                                            Schematic representation                                         of      the         microswitch
                                                                            connections:
Installation

The valve is fitted with                                                    A) Flow switch used to activate an appliance when there is no flow
a series of blades to
be used for the
various pipe                                                      3"
                                                                   -DN 80

diameters which are of                                                                                             LINE
special size for easy                                             4"
                                                                   -DN100

installation and                                                                                                                 1
                                                                                                                             SWITCH
minimum loss of                                                   5"
                                                                   -DN125

pressure.
                                                                                                                                 3
                                            1"                    6"
                                                                   -DN150
                                                                                                                                N0
                                            1 1/4"
                                            1 1/2"                 DN175
                                            2"                                                                                         2
                                                                                                                                       NC
                                            2 1/2"                8"
                                                                   -DN200



                                                                                                                   LOAD


                                                                            B) Flow switch used to activate an appliance when there is a flow
The flow switch is installed
on the pipe in a position
which may be horizontal
                                                                                                                   LINE
according to the direction
of flow shown by the
                                                                                                                                  1
arrow located on the
                                                                                                                             SWITCH
cover and on the
                                                                 80 mm




external part of the                                                                                                               3
body.                                                                                                                            NO
For the blade to
function correctly the                                                                                                                 2
flow switch must be                                                                                                                    NC
installed so that it
corresponds to the                                                                                                 LOAD
dimension shown on
the drawing.
                                                                             Hydraulic data

                                                                             Operating flow rate (m3/h)
Calibration
                                                                                                                    1 1/4”

                                                                                                                              1 1/2”



                                                                                                                                                  2 1/2”




The valve is calibrated by turning the screw in the clockwise                 Pipe
                                                                              diameter
                                                                                                              1”




                                                                                                                                            2”



                                                                                                                                                            3”

                                                                                                                                                                  4”

                                                                                                                                                                        6”

                                                                                                                                                                              8”



direction for the contacts to be closed at higher flow values or in
the anticlockwise direction at lower values.
                                                                              CALIBRATION




                                                                                            with increasing
                                                                                MINIMUM




Once the valve has been adjusted the calibration screw is locked                            flow
                                                                                                              1,3 1,7        2,6           3,0 15          16,8 10     16,5   37
with the attachment ring nut.
                                                                                            with decreasing
The operator is protected                                                                   flow
                                                                                                              0,9 1,25 1,9                 2,2 13,7 15,2 18,5 14,5            33
from the danger of
                                     3
                                                                              CALIBRATION




accidental contact with                                                                     with increasing
                                                                               MAXIMUM




the parts of the flow                                                                       flow
                                                                                                              2,8 3,8        5,9           6,7 11,7 15,8 21,5 43              76
switch subjected to                  2
electric voltage by a                                                                       with decreasing
protective insulating cover          1                                                      flow              2,7 3,7        5,8           6,6 11,5 15,6 21            36     70
fitted over the
microswitch.

                                                                             When the operating flow rate is reached or exceeded with an
                                                                             increasing flow contacts 1 and 3 of the microswitch close whilst
                                                                             contacts 1 and 2 open.
 1 Calibration screw                                                         This is reversed when the operating flow rate is reached with a
 2 Attachment ring nut                                                       reduced flow and contacts 1 and 2 close.
 3 Microswitch protection
                                                                                                                                                               ∆p (kPa)
   Flow Data                                                                                                                                                              Dimensions


                      0,1                                                                                                                                                  code 626600


                                        0,2




                                                                      0,5




                                                                                                                                                                 10
                                                                                                                                                                                                    86,5




                                                                                            1



                                                                                                               2




                                                                                                                                            5
                            0,12
                                   0,14
                                   0,16
                                   0,18


                                              0,25

                                                     0,30
                                                            0,35
                                                                   0,40
                                                                   0,45


                                                                            0,6
                                                                                  0,7
                                                                                        0,8
                                                                                        0,9


                                                                                                  1,2
                                                                                                        1,4
                                                                                                        1,6
                                                                                                        1,8


                                                                                                                     2,5


                                                                                                                                 3,5

                                                                                                                                       4,5
G (m3/h)




                                                                                                                           3


                                                                                                                                       4



                                                                                                                                                  6
                                                                                                                                                        7
                                                                                                                                                              8
                                                                                                                                                              9
            500 450
                  400
                  350
                  300
                  250

            200 180                                                         8"
                  160




                                                                                                                                                                                        60,5
                  140
                  120
            100   90
                  80
                                                                                  6"
                  70
                  60
             50   45
                                                                                         4"




                                                                                                                                                                                134,5
                  40
                  35
                  30
                  25

             20                                                                              3"
                  18
                                                                                                 2"
                                                                                            2 1/
                  16
                  14
                  12




                                                                                                                                                                                        74
             10       9
                      8
                      7
                                                                                                    2"
                      6
                                                                                                             2"
              5 4,5
                    4
                                                                                                   1 1/
                  3,5                                                                                         4"
                    3
                                                                                                        1 1/
                  2,5

              2 1,8
                  1,6                                                                                          1"
                  1,4
                  1,2
              1 0,9
                  0,8
                  0,7
                  0,6
            0,5
                            12
                                   14
                                   16
                                   18


                                              25

                                                     30
                                                            35
                                                                   40
                                                                   45


                                                                            60
                                                                                  70
                                                                                        80
                                                                                        90


                                                                                                  120
                                                                                                        140
                                                                                                        160
                                                                                                        180


                                                                                                                     250

                                                                                                                           300
                                                                                                                                 350
                                                                                                                                       400
                                                                                                                                       450


                                                                                                                                                  600
                                                                                                                                                        700
                                                                                                                                                              800
                                                                                                                                                              900
                      10



                                        20




                                                                      50



                                                                                            100



                                                                                                               200




                                                                                                                                            500



                                                                                                                                                                 1000




                                                                                                                                                                                                     1"

                                                                                                                            ∆p (mm w.c.)                                                       63



   Localized coefficient of pressure loss ξ

   Ø Tube      1"            1 1/4" 1 1/2"                           2"           2 1/2"                3"           4"                6"                8"

     ξ            9                 6           5                    4                  3               2            1                  1               0,5




   CALEFFI S.P.A. I - 28010 FONTANETO D'AGOGNA (NO) S.S.229 TEL.INT. +39 0322 8491 R.A.                                                                                                             FAX +39 0322 863723
                                  · http://www.caleffi.com · e-mail: info@caleffi.it ·

								
To top