Rubber Bellows Mechanical Seals

A rubber bellows mechanical seal is a non-pusher face seal whose flexible elastomer bellows provides secondary sealing and transmits rotation. The bellows flexes as the faces wear instead of sliding a secondary seal along the shaft, helping avoid fretting and accommodate limited movement.

Key facts

Family: Rotary & Mechanical Seals
Common types: Standard bellows, Extended bellows, Drive-band bellows, Water-pump seal, Submersible-pump seal
Materials: NBR, EPDM, FKM (fluoroelastomer), Neoprene, Carbon graphite, Silicon carbide
Used in: Clean-water pumps, Submersible pumps, HVAC pumps, Pool pumps, Sewage pumps

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Types

Standard bellows
Extended bellows
Drive-band bellows
Water-pump seal
Submersible-pump seal

Materials

Applications

Clean-water pumps
Submersible pumps
HVAC pumps
Pool pumps
Sewage pumps

What to send for a quote

shaft diameter
operating length
stationary seat dimensions
pumped fluid
pump arrangement

Questions about rubber bellows mechanical seals

What should I send to identify rubber bellows mechanical seals?

Send shaft diameter, operating length, stationary seat dimensions, pumped fluid, pump arrangement. Include the complete boot, spring and stationary seat because bellows assemblies with similar shaft sizes can have different working lengths. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select rubber bellows mechanical seals?

Match bellows compound and face pair to the liquid, solids, lubrication, shaft movement and available installation length. 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