Valve Stem Seals

Valve Stem Seals are designed to prevent fluid or gas leakage along moving valve stems in industrial valve assemblies. Installed between the valve stem and surrounding sealing housing, these components help maintain pressure containment during valve operation.

Depending on the valve design, stem seals may use elastomeric O-rings, lip-type sealing elements or PTFE-based sealing arrangements. They are commonly found in ball valves, butterfly valves, control valves and specialized process valves.

Features & Advantages

• Stem Leakage Control: Helps prevent external leakage around rotating or reciprocating valve stems.

• Multiple Sealing Designs: Available in elastomeric, PTFE-based and spring-energized configurations.

• Chemical Compatibility Options: Different sealing materials can be selected for water, oils, gases and chemical media.

• Low-Friction Options: PTFE sealing elements can reduce friction in suitable valve stem applications.

• Compact Construction: Suitable for limited installation spaces in valve bodies and gland assemblies.

• Custom Replacement Supply: Seal dimensions and profiles can be matched to existing valve components.

Materials & Construction

NBR stem seals are commonly used with mineral oils and compatible hydraulic or lubricating fluids.

EPDM provides good resistance to water, weathering and selected aqueous media. FKM offers improved resistance to many oils, fuels and elevated-temperature applications.

PTFE and filled PTFE compounds are used where chemical resistance or low-friction performance is important. Selected PTFE seals use elastomeric or metallic energizers to maintain sealing contact.

The appropriate material and seal profile depend on the valve stem movement, pressure, temperature, process medium and gland geometry.

Typical Applications

• Ball valves and butterfly valves

• Industrial control valves

• Hydraulic and pneumatic valves

• Chemical processing valves

• Water treatment equipment

• Industrial fluid control systems

• Valve maintenance and replacement

Standard & Custom Supply

CORA SEALS supplies industrial valve stem seals in standard and custom dimensions for valve manufacturers, industrial distributors and equipment maintenance applications.

For quotations, please provide the stem diameter, housing groove dimensions, seal profile, material and quantity. Valve model numbers, samples or drawings can help confirm the correct replacement specification.

Operating pressure, temperature, medium and stem movement should also be provided for material and profile selection.