Primary Seal: Temperature Range -40°C to 200°C

Q: What is the difference between primary and secondary seals?

Primary seals handle the main sealing function under system pressure, while secondary seals act as backups or exclude contaminants. In poppet assemblies, the primary seal directly contacts the valve seat.

Q: How often should primary seals be replaced?

Replacement intervals depend on operating conditions, typically 1-5 years. Monitor for leaks, extrusion damage, or compression set exceeding 25%.

Component Specifications

Definition

The primary seal is a critical sealing component within poppet/seal assemblies, designed to create a positive barrier against fluid or gas leakage between moving and stationary parts in valves, cylinders, and actuators. It ensures system integrity, pressure retention, and contamination control in industrial machinery.

Working Principle

Operates by elastic deformation under compressive load to fill microscopic surface irregularities between mating surfaces, creating a hermetic seal. In poppet assemblies, it typically seals against a valve seat when the poppet is in the closed position, blocking flow paths.

Materials

Commonly made from elastomers (NBR, FKM, EPDM, PU), thermoplastics (PTFE, PEEK), or composite materials. Material selection depends on fluid compatibility, temperature range (-40°C to 200°C), pressure (up to 6000 psi), and environmental conditions.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	70-90 Shore A
Compression Set	<20%
Pressure Rating	Up to 6000 psi
Temperature Range	-40°C to 200°C
Fluid Compatibility	Hydraulic oils, air, water, chemicals

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 3601, ISO 6194, DIN 3770, SAE J515

Parent Products

This component is used in the following industrial products

Poppet/Seal Assembly

A sealing and flow control assembly for rapid-activation valve banks, combining a poppet valve with integrated sealing elements.

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Engineering Analysis

Risks & Mitigation

Seal extrusion under high pressure
Chemical degradation from incompatible fluids
Thermal aging at extreme temperatures
Installation damage from improper handling

FMEA Triads

Trigger: Excessive clearance between mating parts
Failure: Seal extrusion and permanent deformation
Mitigation: Use anti-extrusion rings, maintain proper gland design per ISO 3601, limit pressure spikes

Trigger: Fluid incompatibility
Failure: Swelling, cracking, or chemical degradation
Mitigation: Verify fluid compatibility charts, select appropriate elastomer (e.g., FKM for aggressive chemicals)

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1mm on critical dimensions per ISO 3601-1

Test Method

Pressure decay testing per ISO 13845, leak rate measurement, compression set testing per ASTM D395

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Primary Seal

Manufacturer profiles associated with Primary Seal.

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Frequently Asked Questions

What is the difference between primary and secondary seals?