PTFE Bellows Mechanical Seals

A PTFE bellows mechanical seal is an externally mounted non-pusher seal whose convoluted fluoropolymer bellows separates vulnerable metal parts from the process. It provides a chemically resistant secondary barrier for pumps handling aggressive liquids, while the face pair forms the rotating fluid interface.

Key facts

Family: Rotary & Mechanical Seals
Common types: External clamp type, Replaceable-face type, Filled-PTFE bellows, Flanged bellows unit
Materials: Virgin PTFE, Glass-filled PTFE, Silicon carbide, Alumina ceramic, Stainless steel
Used in: Acid transfer pumps, Chemical dosing, Electroplating pumps, Reactor vessels, Fertiliser processing

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Types

External clamp type
Replaceable-face type
Filled-PTFE bellows
Flanged bellows unit

Materials

Applications

Acid transfer pumps
Chemical dosing
Electroplating pumps
Reactor vessels
Fertiliser processing

What to send for a quote

shaft diameter
mounting and stud dimensions
process chemistry
working length
face material need

Questions about ptfe bellows mechanical seals

What should I send to identify ptfe bellows mechanical seals?

Send shaft diameter, mounting and stud dimensions, process chemistry, working length, face material need. State whether the face is integral or replaceable and provide the full external clamp and stud arrangement. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select ptfe bellows mechanical seals?

Confirm chemical compatibility of bellows, faces and hardware, plus vapour behaviour, solids and external mounting space. 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