Single-Acting Cylinders
One port, extending under pressure and returning under load, spring or gravity. Common on tipping gear, jacks, presses and simple lifting frames.
Features
- Only the extend stroke is powered, so return speed depends on the load and the return line restriction rather than on pump flow.
- Breathers and drain arrangements matter because the space behind the piston has to breathe as the rod moves.
- Return speed is controlled at the valve, not the cylinder; a body dropping too fast is a valve metering question.
- Spring-return versions are limited in stroke and force by the spring, which makes them suited to short clamping duties.
- Because there is no powered retraction, a stuck cylinder cannot be pulled back hydraulically, which affects how a fault is cleared on site.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Bore x stroke | 125 x 1 200 | mm | force and reach in one line |
| Return method | gravity / spring | decides return speed and whether stroke is limited | |
| Working pressure | 200 | bar | checked against the valve relief setting |
| Mounting | trunnion with 50 mm pin | pin and centres fix the installation |