Hydraulic Buffer Seals

A hydraulic buffer seal is a primary rod-side seal placed ahead of the main rod seal to moderate pressure peaks. Its profile protects the secondary seal while allowing trapped intermediate fluid to return appropriately, helping a tandem sealing arrangement work without harmful pressure build-up.

Key facts

Family: Hydraulic Seals
Common types: Stepped buffer seal, Vented lip buffer, Energised slide ring, Buffer with anti-extrusion ring
Materials: Polyurethane, Bronze-filled PTFE, NBR, FKM (fluoroelastomer), POM
Used in: Excavator cylinders, Demolition equipment, Mining supports, Scrap balers, Heavy presses

Enquire on WhatsApp Email us

Types

Stepped buffer seal
Vented lip buffer
Energised slide ring
Buffer with anti-extrusion ring

Materials

Applications

Excavator cylinders
Demolition equipment
Mining supports
Scrap balers
Heavy presses

What to send for a quote

rod diameter
gland diameter and width
tandem layout
peak pressure behaviour
hydraulic fluid

Questions about hydraulic buffer seals

What should I send to identify hydraulic buffer seals?

Send rod diameter, gland diameter and width, tandem layout, peak pressure behaviour, hydraulic fluid. Show the orientation and spacing of both seals because a buffer seal is not simply a second standard rod seal. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select hydraulic buffer seals?

Select a venting profile that works with the downstream rod seal, expected pressure spikes, speed and extrusion clearance. Confirm the mating parts and operating environment before ordering, since an apparently similar size can use a different profile, material or internal arrangement.

Last updated: 2026-10-08