Pressure Control Switch

Triple Pole

Salient Features

  • Exceptionally longer life
  • Operation easy and trouble free
  • For longer life of switching cycles use of bimetallic contact buttons having a thick layer of silver (Ag, cdo 10%)
  • Bakelite contact block made of tested quality powder for very good electrical and mechanical properties.
  • Different stage of pressure easy to set
  • Glossy scratch resistant
  • Very rigorous electrical and mechanical tests for each switch in our factory
  • Slick, superior finishing

TRIPLE POLE PRESSURE SWITCHES TYPE : PR, PRV, PRX & PRVX.

Application : PR, PRV, PRX & PRVX type Switches are uses for automatically start & stop motors of compressors and pressurised water plants.

PR TypePR type switches are without unloader valve & on/off knob.
PRX TypeWith on/off knob but without unloader valve.
PRVX TypeWith on/off knob & unloader valve.
PRV TypePRV type switches are relieves the pressure over the compressor piston when the electric motor stops by providing an unloader valve Hence, when the compressor starts again there is no gauge pressure on the compressor piston and as a result it increases the life of ele. motor & compressor.

Medium Temperature : They can withstand temperature of medium up to 100 c. (211 f) for Air and water.

Mounting on Compressor : The pressure switches are designed for fitting to the air receiver by means of the connection – (10)

Operating Principles : PR, PRV switches have a triple pole cut out, the position of which depends upon the pressure at pipe connection (10) and set pressure. Turning the regulating nut (6) towards (+) increases the cut out pressure, where as turning towards (-) reduces the cut out pressure cut in pressure is the difference between cut out pressure and differential turning regulating screw (2) towards (+) increases the differential (reduces cut in pressure) where as turning towards (-) reduces the differential (increase cut in pressure).

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Cut-outPressure Range MaximumDifferential MinimumDifferential
Kg. psi. Kg. pci. Kg. psi.
PR-4

PRV-4

PR-4X

PRV-4X

1-4 14-58 0.6-0.7 8.5-10 4 57 Without unloading valve & on/off knob.
With unloader valve but without on/off knob.
With on/off know but without unloader valve.
With on/off knob & unloader valve.
PR-9

PRV-9

PR-9X

PRV-9X

2.5-9.5 35.5-135 1.2-1.8 17-26 7 100 Without unloading valve & on/off knob.
With unloader valve but without on/off knob.
With on/off know but without unloader valve.
With on/off knob & unloader valve.
PR-15

PRV-15

PR-15X

PRV-15X

7-15 100-213 1.7-2.3 21-33 7 100 Without unloading valve & on/off knob.
With unloader valve but without on/off knob.
With on/off know but without unloader valve.
With on/off knob & unloader valve.