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HVX Pressure to Latch Open Air Shut Off Valve


The Chalwyn HVX pressure to latch open with manual open/stop lever valve is designed to be latched open with engine oil pressure. The valve is opened using the manual start/stop lever. Once the engine has been started and running, the valve is held open by the engine oil pressure. The valve will close when the oil pressure at the valve drops below 20 psi (1.4 bar).


  • For use in automatic or manual shutdown systems
  • “Fail safe” design – the valve closes on loss of oil pressure
  • Uses manual lever to open valve before oil pressure is present
  • Slim-fit 3” and 5” (76mm and 127mm) valve body
  • Basic flange mount with hose adaptors available (½” to 6” | 38 to 152mm)
  • Valve bodies and discs are PTFE coated hard anodized aluminum
  • Shaft and mechanisms are stainless steel


  • Drilling rigs (onshore & offshore)
  • Drilling support equipment
  • Well servicing equipment
  • Refinery support equipment
  • Mining equipment
  • Generator sets
  • Marine engines - work boats, barges
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More Information


Size (in) 2.5"
Size(mm) 65
End Connection Hose Barb
Actuation Oil Pressure
Position Indication Available No
Connectors TBD
Position Indication Logic Valve Open - Switch Open
Side Left
Elbow Kit Valve Only (No Elbow)
Style Butterfly
Max Air Intake Temp (F) 257
Min Air Intake Temp (F) -40
Max Pressure (psi) TBD
IP Protection No
Hazardous Location Certification No
Power To Close or Energize To Run (Fail Safe) Fail Safe
Reset Auto Reset