Disc/Seat: Temperature Range -50°C to 400°C

Component Specifications

Definition

The Disc/Seat assembly in a pressure relief valve consists of two precisely engineered components: the disc (or poppet) that moves to open or close the flow path, and the seat—a stationary ring or surface that provides a sealing surface for the disc. This critical interface maintains system pressure within safe limits by allowing controlled release of excess pressure when predetermined setpoints are exceeded. The sealing quality directly determines valve leakage rates, reseat pressure, and overall system safety.

Working Principle

When system pressure exceeds the valve's set pressure, the disc lifts from the seat, creating a flow path for fluid release. As pressure drops below reseat pressure, spring force returns the disc to contact the seat, re-establishing the seal. The disc-seat geometry (flat, conical, or nozzle-type) determines flow characteristics, blowdown, and stability.

Materials

Typically hardened stainless steel (AISI 410, 316), stellite alloys, or ceramic coatings for wear resistance. Seats may incorporate elastomeric inserts (Viton, EPDM) for bubble-tight seals in low-pressure applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Leakage Class	ANSI/FCI 70-2 Class IV or better
Seat Diameter	DN15-DN200
Surface Finish	Ra ≤ 0.4 μm
Temperature Range	-50°C to 400°C
Set Pressure Range	0.5-300 bar

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 Valve

A safety device that automatically releases excess pressure from a system to prevent equipment damage or failure.

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Engineering Analysis

Risks & Mitigation

Catastrophic overpressure if sealing fails
Process contamination from leakage
Unplanned downtime during replacement

FMEA Triads

Trigger: Abrasive particles in fluid stream
Failure: Erosion of sealing surfaces causing increased leakage
Mitigation: Install upstream filters; specify hardened materials (stellite); implement regular fluid analysis

Trigger: Thermal cycling beyond design limits
Failure: Distortion/misalignment preventing proper resealing
Mitigation: Select materials with matched thermal expansion; install thermal shields; monitor temperature gradients

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Seat flatness ≤ 0.025mm; concentricity ≤ 0.05mm TIR

Test Method

Hydrostatic seat test per API 527; bubble-tight test with inert gas at 90% set pressure

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 Disc/Seat

Manufacturer profiles associated with Disc/Seat.

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Frequently Asked Questions

What causes disc/seat leakage in pressure relief valves?

Common causes include: wear from particulate erosion, corrosion damage, thermal distortion, improper installation alignment, and seal degradation from chemical attack or extreme temperatures.

How often should disc/seat assemblies be inspected?

Inspect during annual valve testing per ASME requirements. High-cycle or corrosive service may require quarterly inspections. Replace if leakage exceeds manufacturer specifications or visible damage exceeds 0.1mm depth.

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/Seat