Hydraulische hogedrukcilinders

What things should one consider when choosing a high pressure hydraulic cylinder?

• Capacity - the force of the cylinder, measured in tonnes.
• Stroke - the length that the piston rod can travel in and out, measured in millimetres.
• Operating pressure - the maximum operating pressure, measure in psi or bar.
• Single / double acting mechanism - single acting cylinders produce force in one direction while double acting cylinders produce force in both extending and retracting directions.

What is the difference between single acting and double acting hydraulic cylinders?

Single acting cylinders only extend via pressure from a pump and retract by the weight of the load or using an inbuilt spring. Double acting cylinders use hydraulic power to both extend and retract.
A simple way to distinguish between them is by looking at the number of ports. Single acting cylinders have one port for the connection of hydraulic cylinders, whereas double acting cylinders have 2 ports. The first port is where the advance (extend) hydraulic hose fittings attach and the second is where the retract hydraulic hose fittings attach.

Which one should I choose - a single or double acting hydraulic cylinder?

• When looking for a device to move the load in both directions, double acting cylinders are ideal. Unlike single acting air cylinders, double acting cylinders can extend and retract without the need for a spring.
• Instead of applying pressurised air into one port, double acting cylinders have two ports where air can enter in and move out. But if you are looking to utilise your machine in linear motion and perform movements such as clamping, positioning & punching, then single acting cylinders might be better.
• Single acting cylinders are mainly used in industrial applications where force is needed in one direction, for example, ejecting parts / items off conveyor belts.
• Double acting cylinders are usually faster, stronger and more efficient than single acting cylinders. Applications that require speed and force would require double acting cylinders whereas light assembly work can be deployed by single acting cylinders.

Can you use a double acting hydraulic cylinder as single acting?

Yes, you can use a double acting cylinder as a single acting cylinder.