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Single Acting vs Double Acting Pneumatic Cylinders

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Single acting and double acting pneumatic cylinders both convert compressed air into linear movement, but they control the return movement differently.

What is a single acting pneumatic cylinder?

A single acting cylinder uses compressed air to move the piston in one direction. The return movement is produced by an internal spring or an external force.

Single acting cylinders are normally described as:

  • Spring return: air extends the cylinder and the spring retracts it.
  • Spring extend: air retracts the cylinder and the spring extends it.

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What is a double acting pneumatic cylinder?

A double acting cylinder uses compressed air to power both extension and retraction. Air is directed alternately to each side of the piston through a directional control valve.

This provides controlled powered movement in both directions and makes double acting cylinders suitable for a broad range of industrial automation duties.

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Main differences

Feature Single acting Double acting
Powered movement One direction Both directions
Return movement Spring or external force Compressed air
Air ports Normally one Normally two
Directional control Simpler valve arrangement Valve controls both directions
Force Affected by spring force Powered force in both directions
Fail position Can return to a defined spring position Depends on valve and machine design

Advantages of single acting cylinders

  • Simple pneumatic control
  • One air connection
  • Defined spring-return or spring-extend position
  • Reduced air use where powered movement is needed in one direction only

Limitations of single acting cylinders

  • Spring force reduces the available working force
  • Stroke options may be more limited
  • Return speed depends partly on the spring and external load
  • The spring can affect movement consistency

Advantages of double acting cylinders

  • Controlled movement in both directions
  • Broader bore and stroke availability
  • Suitable for pushing and pulling duties
  • More control over extension and retraction speed

Typical applications

Single acting cylinders are frequently used for:

  • Clamping
  • Ejecting
  • Stops
  • Locking mechanisms
  • Applications requiring a spring-defined position

Double acting cylinders are frequently used for:

  • Material transfer
  • Machine movement
  • Lifting and lowering
  • Opening and closing
  • Positioning
  • Repeated pushing and pulling

Which type should be selected?

Use a single acting cylinder where the application only requires powered movement in one direction and the spring position is useful.

Use a double acting cylinder where both directions require controlled pneumatic force or where the movement, stroke and speed need greater flexibility.

For further background, read how a pneumatic cylinder works.

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