Pump & Valve Elastomer Seal Selection Guide

Pumps and valves move the fluids that keep industry running, and the elastomer seal is usually the first component to fail. Pump and valve seal selection is a balance of chemical compatibility, temperature, pressure, and—critically—whether the seal is static or dynamic. This guide walks through the common seal types and how to pick the right compound, with links to our rubber seals and diaphragms pages.

Seal Types in Pumps & Valves

• O-rings – static and slow-reciprocating seals in flanges and bonnets.
• Mechanical seal elastomers – the flexible element holding faces, exposed to process fluid.
• Diaphragms – the sealing and actuating member in metering and control valves (see rubber diaphragms).
• Valve seats & balls – elastomer-faced closures for positive shut-off.
• Gaskets & envelope seals – flange and body joints.

Material Selection by Fluid

Base your choice on our o-ring material selection guide and EPDM vs NBR vs FKM comparison.

Static vs Dynamic Seals

Static seals mainly need compression-set resistance; dynamic seals (shafts, plungers, diaphragms) also need low friction, low wear, and sometimes lubrication compatibility. A compound that is fine statically can fail quickly in motion—factor in surface finish and lubrication from the process fluid.

Selection Checklist

1. List every fluid, including cleaning/CIP chemicals.
2. Define temperature and pressure (including surges).
3. Classify each seal static or dynamic.
4. Pick compound by compatibility table; upgrade to FKM/FFKM for aggressive media.
5. Confirm standards (FDA, NACE MR0175 for sour service).

For sour (H₂S) service, see our NACE MR0175 / API 6A and FFKM/FKM/Aflas articles.

Get a Quote

Send your fluid, temperature, and seal type. Request a pump/valve seal quote → or see our FAQ. Back to custom rubber parts.