Coil Spring Mechanical Seals

Coil spring mechanical seals are face-seal assemblies that use one large spring or several small springs to keep rotating and stationary faces together. Single-spring forms tolerate more viscous contamination, while multi-spring layouts distribute closing force evenly within a compact axial envelope.

Key facts

Family: Rotary & Mechanical Seals
Common types: Single helical spring, Conical single spring, Balanced multi-spring, Unbalanced multi-spring, Stationary multi-spring, Protected spring assembly
Materials: Carbon graphite, Silicon carbide, Tungsten carbide, Alumina ceramic, Stainless steel, NBR
Used in: Water pumps, Wastewater pumps, Chemical process pumps, Boiler feed pumps, Paper stock pumps, Refinery pumps

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Types

Single helical spring
Conical single spring
Balanced multi-spring
Unbalanced multi-spring
Stationary multi-spring
Protected spring assembly

Materials

Applications

Water pumps
Wastewater pumps
Chemical process pumps
Boiler feed pumps
Paper stock pumps
Refinery pumps

What to send for a quote

shaft diameter
working length
seal chamber dimensions
stationary seat dimensions
pumped fluid and rotation

Questions about coil spring mechanical seals

What should I send to identify coil spring mechanical seals?

Send shaft diameter, working length, seal chamber dimensions, stationary seat dimensions, pumped fluid and rotation. Specify rotation direction for conical springs and show how the stationary seat seals into its housing. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select coil spring mechanical seals?

Choose single or multiple springs, balance and face pairing from solids, fluid lubrication, chamber pressure, rotation and available 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