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PVX Pneumatic Spring Return Air Shut Off Valve


The Chalwyn PVX pneumatic spring return butterfly valve uses a spring return rotary actuator. It is available in two basic versions:

  • Air pressure to open / spring return close on loss of air pressure (failsafe)
  • Air pressure to close / spring return open on loss of air pressure

Both versions are designed to work with direct pressure operation in either automatic or manual systems.


  • For use in automatic or manual shutdown systems
  • Operating pressure range 43.5 to 116psig (3 to 8bar)
  • Slim-fit 3”, 5”, and 8” (76mm, 127mm, and 203mm) valve body
  • Basic flange mount with hose adaptors available (1½” to 8” | 38 to 203mm)
  • Valve bodies and discs are PTFE coated hard anodized aluminum
  • Shaft and mechanisms are stainless steel


Failsafe PVX-300, PVX-500, PVX-800

  • Pressure to open/loss of pressure to close
  • Failsafe application to meet EU ATEX 94/9/EC defined hasardous areas
  • Zone 1 and 2 applications to EN 1834 engine safety standards
  • US offshore engines to Class 1 Div 1 safety standards
  • International offshore platform engine installations

PVX-301, PVX-501, PVX-801

  • Petrochemical and LNG refineries
  • All international areas where non-failsafe is permitted
  • US offshore BOEMRE safety standards
  • Zone 2 fire pump engine offshore applications
  • Vehicles with air brakes
Configure this part:
More Information
End Connection Hose Barb
Actuation Pneumatic
Position Indication Available No
Style Butterfly
IP Protection No
Hazardous Location Certification No
Power To Close or Energize To Run (Fail Safe) Power-to-Close, Fail Safe
Reset Auto Reset