Metal Bellows Mechanical Seals

A metal bellows mechanical seal is a non-pusher face seal with formed or edge-welded metal convolutions that provide axial flexibility and closing force. Removing a dynamic elastomer from the shaft makes the design useful where process temperature, fluid compatibility or deposit formation challenges conventional secondary seals.

Key facts

Family: Rotary & Mechanical Seals
Common types: Edge-welded bellows, Formed bellows, Rotating bellows, Stationary bellows, Bellows cartridge
Materials: Nickel alloy, Stainless steel, Carbon graphite, Silicon carbide, Tungsten carbide, Flexible graphite
Used in: Hot oil pumps, Petrochemical processing, Thermal fluid systems, Hydrocarbon transfer, Cryogenic equipment

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Types

Edge-welded bellows
Formed bellows
Rotating bellows
Stationary bellows
Bellows cartridge

Materials

Applications

Hot oil pumps
Petrochemical processing
Thermal fluid systems
Hydrocarbon transfer
Cryogenic equipment

What to send for a quote

shaft diameter
chamber bore and depth
process temperature
fluid vapour behaviour
flush or quench arrangement

Questions about metal bellows mechanical seals

What should I send to identify metal bellows mechanical seals?

Send shaft diameter, chamber bore and depth, process temperature, fluid vapour behaviour, flush or quench arrangement. Photograph the bellows convolutions and gland arrangement without compressing the unit, and include its working setting dimension. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select metal bellows mechanical seals?

Select alloy, bellows form and face pair from temperature cycling, corrosion, deposits, pressure balance and process support plan. 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