Structured Manufacturing Data (2026)

Disc/Seat Assembly

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Disc/Seat Assembly used in the Fabricated Metal Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Disc/Seat Assembly is characterized by the integration of Disc and Seat. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The critical sealing interface within a pressure relief valve that opens to release excess pressure and closes to maintain system integrity.

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Product Specifications

Technical details and manufacturing context for Disc/Seat Assembly

Definition

A precision assembly consisting of a disc (or poppet) and a matching seat that forms the primary sealing mechanism in a Metal Tank Pressure Relief Valve Assembly. This component is responsible for maintaining a leak-tight seal under normal operating conditions and allowing controlled fluid or gas flow when predetermined pressure limits are exceeded to prevent tank over-pressurization and potential failure.

Working Principle

Under normal operating pressure, spring force maintains the disc in contact with the seat, creating a seal. When system pressure exceeds the valve's set pressure, the force acting on the disc overcomes the spring force, causing the disc to lift from the seat. This creates an opening through which excess pressure is relieved. Once pressure drops below the reseat pressure, the spring force returns the disc to the seat, re-establishing the seal.

Common Materials

Stainless Steel, Alloy Steel, Brass

Technical Parameters

Diameter of the sealing surface between disc and seat (mm) Per Request

Components / BOM

Disc Part
Movable component that lifts from the seat to allow flow during pressure relief

Material: Stainless Steel
Seat Part
Stationary component that provides the sealing surface for the disc

Material: Stainless Steel
Disc Holder/Stem Part
Connects the disc to the spring mechanism and guides disc movement

Material: Alloy Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Disc/Seat Assembly.

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits

pressure:	Up to 10,000 psi (690 bar)
flow rate:	Cv values from 0.01 to 100
temperature:	-50°C to 400°C
slurry concentration:	Up to 20% solids by weight

Media Compatibility

✓ Steam systems ✓ Hydrocarbon processing ✓ Chemical processing with compatible elastomers

Unsuitable: Hydrofluoric acid environments

Sizing Data Required

Required set pressure (PSIG/bar)
Maximum flow rate (SCFM/Nm³/h)
System operating temperature (°C/°F)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Seat galling and deformation

Cause: Excessive torque during assembly or operation leading to metal-to-metal contact and cold welding, often exacerbated by misalignment, insufficient lubrication, or incompatible material pairing between disc and seat.

Disc erosion and pitting

Cause: Cavitation or abrasive wear from high-velocity fluid flow containing particulates, leading to material loss and compromised sealing integrity, typically due to improper fluid filtration, excessive pressure drops, or corrosive media.

Maintenance Indicators

Audible high-frequency vibration or chattering during operation indicating disc instability or partial blockage
Visible external leakage around the valve stem or body joint, or a persistent drop in system pressure despite normal settings

Engineering Tips

Implement precision alignment procedures during installation and use anti-seize compounds compatible with service media to prevent galling and ensure even seating contact
Install upstream filtration (e.g., 10-micron filters) and maintain fluid cleanliness to minimize abrasive wear, while selecting erosion-resistant materials like stellite or hardened alloys for high-flow applications

Compliance & Manufacturing Standards

Reference Standards

ISO 5208:2015 (Industrial valves - Pressure testing of valves) ANSI/FCI 70-2 (Control Valve Seat Leakage) DIN EN 12266-1 (Industrial valves - Testing of metallic valves)

Manufacturing Precision

Seat Surface Flatness: 0.025mm maximum deviation
Disc Bore Diameter: +0.01mm/-0.00mm tolerance

Quality Inspection

Helium Leak Test (for seat tightness verification)
Surface Roughness Measurement (Ra ≤ 0.8μm for sealing surfaces)

Factories Producing Disc/Seat Assembly

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are available for disc/seat assemblies in pressure relief valves?

Our disc/seat assemblies are fabricated from stainless steel, alloy steel, or brass to meet various industrial requirements for corrosion resistance, strength, and compatibility with different media.

How does the disc/seat assembly maintain system integrity in pressure relief valves?

The disc/seat assembly forms the critical sealing interface that remains closed under normal operating conditions to maintain pressure, then opens precisely when excess pressure is detected to safely relieve system stress.

What components are included in a typical disc/seat assembly BOM?

A complete disc/seat assembly typically includes the disc (sealing element), disc holder/stem (alignment and actuation component), and seat (stationary sealing surface) - all precision-engineered for optimal valve performance.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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