Stainless Steel Pneumatic Actuators – CH-air ‘A’



Pneumatic valve actuator, quarter turn
Brand: CH-air A Type
Rack and pinion design
Blow-out proof pinion
Housing: Forged 316 stainless steel
Surface finish: Raw forged or mirror polished
Ends: Forged 316 stainless
Pinion: 316 Stainless steel
Pistons: Cast aluminium (SS option)
Seals: NBR


Driven by dry, filtered compressed air
Min/ max air pressure: 2bar/ 8bar
Min/ max working temperature: -20C to +80C
Air to open, spring to close (spring return) or air to close (double acting)
Can be configured reverse acting


Torque output dependant upon air supply pressure or quantity of springs.
Allow a safety factor when sizing.
Valve torque increases when idle for long periods.
Valve torque increases in dry duty applications.


CH-air pneumatic actuator in forged 316 stainless steel with raw forged or mirror polish finish housing, rack and pinion design, manufactured in the EU. Model ‘A’ Type. Driven by compressed air with air to open, air to close, double or spring acting function. Conforms to ISO5211 for mounting of valves, and Namur plus VDI-VDE3845 for mounting of solenoid valves, limit switch boxes and positioners. CE marked. ATEX Zone I & II certified and Sil 3 rated. Buy CH-air actuators and actuated valves online at AVS.

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Technical Specs


TypeRack and pinion
Body MaterialForged 316 Stainless Steel
Body FinishRaw forged finish
End CapsForged 316 Stainless Steel
PistonsDie cast aluminium
Spring TypePre-compressed cartridge type
Spring materialEpoxy coated spring steel
PinionNickel plated steel
SealsNBR Nitrile Rubber
Sliding PartsAcetal resin
GreaseHigh performance synthetic
FastenersAISI 304 Stainless Steel