Single-Acting Cylinder Control
A single-acting pneumatic cylinder uses compressed air for one stroke and a spring for the return stroke. Its electrical control is therefore simpler than the two-coil arrangement used for a double-acting cylinder. This diagram shows a protected 24 VDC supply feeding an emergency-stop contact and an Extend pushbutton. The pushbutton energizes a 3/2 directional valve coil, admitting air to the cylinder. When the command is released, the valve exhausts and the spring returns the rod. The pilot light provides a quick indication that the valve coil is energized. Add a position sensor or relay logic if the motion needs confirmation or automatic sequencing.
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Scenario
Spring-return cylinder control
Key decisions
- Valve type: Use a 3/2 valve for one powered cylinder direction.
- Return motion: The cylinder spring returns when the coil is de-energized.
- Indication: Show coil state with a pilot light.
When to reuse this
Use where a cylinder extends under air pressure and returns by its internal spring.
Frequently asked questions
What is a single-acting cylinder?
Why use a 3/2 valve?
What happens when power is removed?
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