Pneumatic Valve & Spool Seals

Pneumatic valve and spool seals are compact low-friction elements that separate air passages in directional valves, regulators and manifolds. Their geometry permits a spool or poppet to shift repeatedly while limiting cross-port leakage and avoiding excessive drag in dry or lightly lubricated compressed air.

Key facts

Family: Pneumatic Seals
Common types: Spool-mounted seal, Sleeve groove seal, D-ring, Poppet pad, Miniature U-seal
Materials: NBR, HNBR, FKM (fluoroelastomer), Polyurethane, PTFE compound
Used in: Directional valves, Solenoid manifolds, Air regulators, Process actuators, Pneumatic controls

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Types

Spool-mounted seal
Sleeve groove seal
D-ring
Poppet pad
Miniature U-seal

Materials

Applications

Directional valves
Solenoid manifolds
Air regulators
Process actuators
Pneumatic controls

What to send for a quote

spool and bore diameters
groove width
port layout
air lubrication state
cycling duty

Questions about pneumatic valve & spool seals

What should I send to identify pneumatic valve & spool seals?

Send spool and bore diameters, groove width, port layout, air lubrication state, cycling duty. Provide the valve section drawing where possible, since small spool seals often depend on precise groove and port geometry. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select pneumatic valve & spool seals?

Consider friction, port-edge damage, pressure direction, cycle rate, air quality and compatibility with any lubricant or process gas. 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