Single Acting Hydraulic Pump: Everything You Need to Know

A single acting hydraulic pump is a hydraulic power unit that supplies pressurized oil to move a cylinder in one direction. The cylinder returns by gravity, a spring, or another external force, so this arrangement is often called power-up, gravity-down.

From a technical standpoint, the term ‘single acting’ describes the cylinder and circuit rather than the pump alone.

A single acting pump is suitable when equipment needs powered lifting, pushing, or extension in one direction and has a reliable return force. It works best in power-up, gravity-down applications, where the load can return safely without pump-driven retraction.

The return condition must be checked as carefully as the lifting requirement. Confirm that gravity, spring force, or the external load can return the cylinder consistently and at a controlled speed. If the machine needs powered retraction, bidirectional load control, or precise positioning, a double-acting system is usually more suitable.

When an up command is given, the motor drives the pump to draw oil from the reservoir and send pressurized oil through the valve block to the cylinder. The cylinder extends to lift or push the load. In some circuits, a check valve prevents reverse flow when the motor stops; the required load-holding and safety components must be selected for the application.

To lower or retract, the release valve opens and allows oil to return to the reservoir. Gravity, a spring, or another external force then returns the cylinder. Where lowering speed matters, the return circuit should be designed with the appropriate flow-control and safety components.

Three factors should be confirmed before selecting a single acting hydraulic pump:

These details provide the basis for a suitable configuration. For help with tank capacity, valve logic, controls, duty cycle, or special installation conditions, contact our professional team for support and send us your application information for a professional recommendation.

A single acting pump is often preferred when the machine has a reliable return path and a compact hydraulic layout is important. A double-acting solution is more appropriate when the equipment must retract under hydraulic power or control movement in both directions.

Jade Crown Hydraulic is a professional hydraulic power unit manufacturer providing standard and application-specific single-acting solutions. We match the power unit to the circuit, installation space, and operating conditions, helping you avoid unsuitable component choices.

For support with motor, pump, tank, port, and control selection, send us your application parameters for a technical recommendation.

A single acting hydraulic pump normally refers to a power unit for a single-acting cylinder. It supplies hydraulic power in one direction, while the cylinder returns through gravity, a spring, or another external force.

A single-acting system powers one cylinder direction and relies on an external force for return. A double-acting system uses hydraulic pressure to extend and retract the cylinder.

Gear, vane, and piston pumps are three common hydraulic pump types. The right type depends on the required pressure, flow, efficiency, and application conditions.

Lead time depends on the model, configuration, order quantity, and production schedule. After the specification is confirmed, we will provide the applicable delivery plan, technical documentation, functional-test confirmation, and one year of after-sales support according to the agreed service terms.