Double acting pneumatic actuator manufacturer

Double acting pneumatic actuator with handwheel is a kind of adjustable and flexible pneumatic actuator that can open and close the valves with a reciprocating linear motion. It is a combination of pneumatic automation and a hand wheel override for manual emergencies or maintenance operations.

Working Principle

Double acting pneumatic scotch yoke actuator uses compressed air to create motion in and opposite to the working direction. Unlike spring-return operators, it needs air pressure on both sides of the piston to move up or down. A handwheel is added to enable manual operation whenever there is no air pressure or when there is a system failure.

Double acting pneumatic actuator with handwheel Specification：

Comply to UNI EN 15714-3:2009 standard

ISO connection standard：UNI EN ISO 5211。

Auxiliary connectioin：NAMUR,VDI/VDE3845

Control angle：90°(-5°~+3°)。

Torque：Relative to control pressure and type.

Working Condition：

Operation temperature：

Standard：-20℃~+80℃

High temperature：-20℃~+120℃

Low temperature：-50℃~+60℃

Pressure：2-6bar

Operating Medium：Filtered compressed air dry or lubricated.The pressure condensation point in accordance with (ISO 8573-1:2010, Class 3) has to be ≤ - 20℃ or 10℃under ambient temperature.

The maximum particle size in accordance with (ISO 8573-1:2010, Class 5) should not exceed 40 µm.

Our double acting pneumatic actuator with integrated handwheel combines automated pneumatic control with reliable manual operation in a single robust package. Pneumatic scotch yoke actuators are designed for critical industrial applications where fail-safe operation is essential, this actuator provides:

Fully automated pneumatic control for normal operation

Instant manual override capability via integrated handwheel

Seamless transition between automatic and manual modes

Superior durability for harsh industrial environments

Key Features & Benefits

1. Dual Operation Modes

Pneumatic operation: Air pressure drives piston movement in both directions (open/close)

Manual operation: Integrated handwheel allows direct mechanical control

No tools required for mode transition

Positive engagement ensures secure manual operation

2. Robust Construction

Heavy-duty aluminum or stainless steel housing

Corrosion-resistant coatings available

IP66/IP67 protection standard (IP68 optional)

-40°C to +120°C operating range

3. Precision Engineering

Smooth, vibration-free operation

Adjustable pneumatic cushions for controlled movement

Precision gear reduction for easy manual operation

Torque outputs from 50Nm to 5,000Nm

4. Safety & Reliability

Fail-safe manual operation during air supply failure

Visual position indicator

Locking mechanism to secure valve position

ATEX/IECEx certified models available

5. Easy Installation & Maintenance

ISO 5211 direct mounting

Standard NPT/G-thread air connections

Field-replaceable seals

Lubrication-free design

Applications

Pneumatic scotch yoke actuators with handwheels are widely used in industries requiring both automation and manual backup, such as:

Oil & Gas – Pipeline valves, wellhead controls, and refinery systems.

Chemical Processing – Control of corrosive or high-pressure fluids.

Water & Wastewater – Large gate valves and sluice gates.

Power Plants – Boiler feed systems and steam isolation valves.

Marine & Offshore – Ballast and fuel line controls.

Advantages Over Standard Actuators

✅ No Spring Fatigue – Unlike spring return actuators, double acting pneumatic actuators do not rely on springs, reducing wear.

✅ Higher Precision – Air pressure on both sides allows for better positioning control.

✅ Emergency Readiness – The handwheel ensures operation during power or air supply failures.

✅ Lower Maintenance – Fewer moving parts compared to gear-based manual actuators.

Selection Considerations

When choosing a pneumatic scotch yoke actuator with a handwheel, consider:

Torque Requirements – Match the actuator’s torque to the valve’s needs.

Handwheel Type – Double acting pneumatic actuators are fully disengageable, while others are always engaged.

Material Compatibility – Ensure resistance to process fluids and environmental conditions.

Air Supply Pressure – Standard operation typically requires 4-7 bar (60-100 psi).

Pneumatic Scotch Yoke Actuator Benefits：

1.Corrosion-resistant connectors

All connection bolts are stainless steel with good corrosion resistance

2.Piston ring

The piston guide ring, made of ultra high molecular polymer, has an extremely low coefficient of friction, while the material has high hardness and excellent wear resistance, providing precise guidance and long service life.

3.Body

The cylinder body is processed with high precision and anodized. The thickness of the oxide layer is more than 20μm. It has low friction coefficient and excellent anti-corrosion and wear resistance.

4.Shaft bearing

Prevent direct contact between shaft and cylinder block, ensure the positioning accuracy of drive shaft, reduce friction loss, prevent direct contact between shaft and cylinder block, make the actuator efficient operation.

5.Piston bearing

Ensure the positioning accuracy of the piston, so that the piston can be smooth and smooth operation, prevent shifting.

6. Pin connection

The fork and the drive shaft are connected by pins to ensure that the fork and the drive shaft run synchronously. At the same time, the pins also play a role in preventing the drive shaft from flying out, which is a reliable and safe design.

7.Handwheel

The handwheel integrated on the actuator reduces the space required for installation and reduces the load on the pipeline.

Torque table（Nm）：