Telescopic seals

telescopic sealsTelescopic cylinders are a special design of a hydraulic cylinder or pneumatic cylinder which provide an exceptionally long output travel from a very compact retracted length.

Telescopic cylinders are available in single acting, a single acting / double acting combination, or a double acting design. A double acting Telescopic cylinder is a more complex design and involves additional sealing within the internal body of the cylinder to seal off the different stages.

Although the price of a seal is relatively inexpensive, choosing the wrong seal / material for use in a telescopic cylinder can prove costly should it fail. The financial costs of loss of production, engineer downtime and / or calling in engineers can soon add up. It’s for these reasons that it’s important to ensure you select a high quality seal that is the right material.

We supply a range of Rod seals for use in one piece gland that are specifically designed for sealing in telescopic cylinders. The double-lip seals secure and aid efficient lubrication for each pull-out and protect the cylinder. The unique sealing system offers less friction and ensures a longer life-cycle.

telescopic seals diagramEach set consists of two elements:
Nitrile (NBR) 80 shore and NBR impregnated fabric sealing element.
Polyelastomer header ring.
Heavy duty polyurethane wiper seal to accompany rod seal.
We offer these seals in both Inch and Metric sizes.


Example application – Tipping Trailer Cylinders

Images courtesy of Wye Cylinder Engineering
telescopic seals