PR-4 Manual Reset Relay (Model 1902)

The Ruelco PR-4 relay is a multi-pressure control valve for production control and safety systems. It functions as a pilot operated, normally closed, block and bleed valve. Its simple and compact design makes maintenance and repair easy. The PR-4 relay does not need to be removed from its control panel or system loop if repair or maintenance is necessary.

  • 316 stainless steel construction (models to N.A.C.E. MR0175 available).
  • Easy to close with pilot signal pressures as high as 100 PSI.
  • Can be repaired without removing relay from system or panel.
  • May be used in pneumatic or hydraulic systems.
  • ‘Lock closed’ design prevents relay from automatically opening.
  • Viton and nitrile seals are utilized for dependability.
  • Design minimizes malfunctions due to supply system debris.
  • Inconel X-750 20 PSI spring assures dependability in most corrosive environments (optional 30 PSI spring available).
  • Optional stem protector available to prevent external debris accumulation on relay shaft.
  • Available with black, red, or green knob (green standard).
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