Product
Hydraulic & Pneumatic Seals
Rod seals, piston seals, wipers and wear rings engineered for reciprocating cylinder assemblies across a wide pressure and speed range.
Piston seals, rod seals and wiper seals for hydraulic and pneumatic cylinders.
Overview
What it is
This is the family of seals fitted inside a hydraulic or pneumatic cylinder — rod seals, piston seals, wiper seals and wear rings — each doing a distinct job around the reciprocating piston and rod assembly.
The piston seal separates the cylinder's two pressure chambers as the piston moves; the rod seal (in the cylinder head) keeps pressurised fluid from leaking past the rod to atmosphere; the wiper seal, outermost in the head, scrapes contamination off the rod as it retracts; and wear rings (guide rings) carry the radial load of the piston and rod, preventing metal-to-metal contact with the bore.
Why use it
Key benefits
- Purpose-built profile for each function rather than one generic seal doing every job
- Designed as a matched set for a given cylinder bore and rod diameter
- Available for both hydraulic (oil-filled) and pneumatic (air-filled, lower-friction) duty
Materials
Which compound, and why
NBR (Nitrile / Buna-N)
General-purpose hydraulic seal compound, oil and moderate-temperature service.
PTFE (Virgin, Glass, Bronze, Graphite)
Piston rings and rod seals in high-speed or high-temperature applications needing very low friction.
Applications
Where it's used
Hydraulic cylinders, pneumatic actuators, and mobile and industrial equipment. See the dedicated Rod Seals, Piston Seals, Wiper/Dust Seals and Pneumatic Seals pages for each element individually.