Disc / Poppet: Diameter Range 3-300 mm

Component Specifications

Definition

A Disc or Poppet is a precisely engineered sealing element in pressure relief valves and safety devices. It functions as the movable component that responds to system pressure changes by lifting off its seat to discharge fluid or gas when predetermined pressure thresholds are exceeded, then reseals when pressure normalizes. This component ensures system safety by preventing overpressure conditions that could lead to equipment damage or hazardous situations.

Working Principle

The disc/poppet operates on pressure differential principles. When system pressure exceeds the set pressure, the force acting on the disc area overcomes the spring force holding it closed. This causes the disc to lift from its seat, creating an opening for pressure relief. As pressure decreases below the reseat pressure, the spring force pushes the disc back against the seat, restoring the seal. The disc geometry and seating surface are designed to provide predictable opening characteristics and reliable resealing.

Materials

Typically manufactured from corrosion-resistant materials including stainless steel (304, 316), brass, carbon steel with protective coatings, or specialized alloys for high-temperature or corrosive applications. Sealing surfaces may incorporate elastomers (Viton, EPDM) or soft metals (copper, aluminum) for improved sealing performance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter Range	3-300 mm
Surface Finish	0.4-1.6 μm Ra on seating surfaces
Pressure Rating	Up to 10,000 psi (690 bar)
Temperature Range	-50°C to 400°C
Flatness Tolerance	0.0005 in/in
Lift To Diameter Ratio	0.05-0.25

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 4126, ASME BPVC Section VIII, API 526, DIN 3320

Parent Products

This component is used in the following industrial products

Pressure Relief Device

A safety component that automatically releases excess pressure from a closed system to prevent equipment failure or rupture.

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Engineering Analysis

Risks & Mitigation

Seal failure leading to system leakage
Sticking or binding preventing proper operation
Corrosion compromising structural integrity
Fatigue failure from cyclic loading
Improper reseating causing continuous leakage

FMEA Triads

Trigger: Corrosion or erosion of seating surfaces
Failure: Leakage during normal operation
Mitigation: Use corrosion-resistant materials, implement protective coatings, establish regular inspection schedules

Trigger: Accumulation of process deposits
Failure: Disc sticking preventing proper opening
Mitigation: Install upstream filters, use self-cleaning designs, implement regular maintenance cleaning

Trigger: Spring fatigue or incorrect spring selection
Failure: Premature opening or failure to reseat
Mitigation: Proper spring specification for application, regular spring testing and replacement, use of certified components

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 286, seating surface flatness within 0.0005 in/in, surface finish 0.4-1.6 μm Ra

Test Method

Hydrostatic/pneumatic seat leakage test per API 527, set pressure verification per ASME PTC 25, functional testing with certified calibration equipment

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Disc / Poppet

Manufacturer profiles associated with Disc / Poppet.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between a disc and poppet in pressure relief devices?

While often used interchangeably, 'disc' typically refers to flat sealing elements, while 'poppet' describes dome-shaped or conical designs. Poppets often provide better flow characteristics and stability during opening.

How often should disc/poppet components be inspected?

Regular inspection intervals depend on service conditions but typically range from 6-24 months. Critical applications may require more frequent checks for wear, corrosion, or deformation that could affect sealing performance.

Can disc/poppet components be repaired or must they be replaced?

Minor surface imperfections can sometimes be re-machined, but significant wear, corrosion, or deformation usually requires replacement to maintain reliable pressure relief performance and safety certification.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Disc / Poppet