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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
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More Information


Size (in) 2.5"
Size(mm) 65
End Connection Hose Barb
Actuation Pneumatic
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