Double Acting vs Spring Return Pneumatic Actuators

PUBLISHED ARTICLE

Use a double acting pneumatic actuator when compressed air is available for both opening and closing. Use a spring return actuator when the valve must move to a defined fail-open or fail-close position after air loss.

The choice should be based on safety logic, valve torque, air supply pressure and accessory requirements.

Kailing rack and pinion pneumatic actuator — Actuator action and fail position are core choices in automated valve packages.

Pneumatic actuatorsDouble actingSpring returnRack and pinionValve automation

Double acting actuator selection

Double acting actuators use compressed air to open and close the valve. They are often chosen when the system can control air in both directions and does not need a mechanical fail position.

Kailing AT double acting pneumatic actuator — Double acting actuators use compressed air for both travel directions.

Spring return actuator selection

Spring return actuators use air in one direction and springs for the return direction. They are used when the valve must fail open or fail closed after air loss.

Cutaway view of a Kailing spring return pneumatic actuator — The spring pack moves the actuator toward a defined position after loss of air supply.

Torque and safety factor

Valve torque, pressure, medium and service condition determine the actuator size. Buyers should not select actuator size by valve diameter alone.

RFQ checklist

Send valve type, size, torque if available, action type, fail position, air pressure, mounting standard, accessory requirements, quantity and photos or drawings.

Quick comparison Circuit selection

Parameter	Value
Double acting	Air opens and air closes the actuator.
Spring return	Air moves one direction and spring returns to fail position.
Key data	Valve torque, air pressure, rotation angle and safety logic.
Mounting	Confirm ISO mounting pattern, shaft and bracket requirements.
Accessories	Limit switch, solenoid valve, positioner and air preparation.

Frequently Asked Questions

FAQ Is spring return always safer?
Not always. It is useful when the system needs a defined fail position, but the correct fail direction depends on the process.
FAQ What data is needed to size an actuator?
Send valve type, valve size, valve torque if available, pressure, action type, rotation angle, mounting standard and accessory requirements.
FAQ Can one actuator fit both ball valves and butterfly valves?
Sometimes, but mounting pattern, torque and shaft connection must match the valve.

Need a quotation?

Send the page link, quantity, drawings and working conditions to Kailing for review.

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