Industry-Verified Manufacturing Data (2026)

Disc/Seat Assembly

Based on aggregated insights from multiple verified 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.

View Full Specifications Explore Manufacturing Sources

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
    Movable component that lifts from the seat to allow flow during pressure relief
    Material: Stainless Steel
  • Seat
    Stationary component that provides the sealing surface for the disc
    Material: Stainless Steel
  • Disc Holder/Stem
    Connects the disc to the spring mechanism and guides disc movement
    Material: Alloy Steel
Engineering Reasoning
0.1-100 bar differential pressure
Sealing failure occurs at 0.01 bar leakage pressure differential, structural failure at 150 bar differential pressure
Design Rationale: Sealing failure: Surface roughness exceeding 0.4 μm Ra prevents metal-to-metal contact sealing. Structural failure: Von Mises stress exceeding 345 MPa yield strength of 316L stainless steel causes plastic deformation.
Risk Mitigation (FMEA)
Trigger Cyclic pressure loading at 0.5-1.0 Hz frequency exceeding 10^6 cycles
Mode: Surface microcrack propagation leading to 0.1 mm seat deformation
Strategy: Shot peening treatment to induce 200-400 MPa compressive residual stress layer
Trigger Corrosive fluid with chloride concentration exceeding 25 ppm at 80°C
Mode: Pitting corrosion initiating at 0.05 mm depth, progressing to through-wall penetration
Strategy: Electroless nickel plating with 50-75 μm thickness achieving 1000 HV hardness

Industry Taxonomies & Aliases

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

stainless steel pressure relief valve disc alloy steel seat assembly for industrial valves brass disc holder stem replacement parts fabricated metal valve sealing components pressure relief valve disc seat BOM

Industrial Ecosystem & Supply Chain DNA

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

Verified manufacturers with capability to produce this product in China

Add your factory

✓ 93% Supplier Capability Match Found

S Sourcing Manager from Germany Jan 28, 2026
★★★★★
"Testing the Disc/Seat Assembly now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
P Procurement Specialist from Brazil Jan 25, 2026
★★★★☆
"Impressive build quality. Especially the technical reliability is very stable during long-term operation. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Canada Jan 22, 2026
★★★★★
"As a professional in the Fabricated Metal Product Manufacturing sector, I confirm this Disc/Seat Assembly meets all ISO standards."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

10 sourcing managers are analyzing this specification now. Last inquiry for Disc/Seat Assembly from Germany (1h ago).

Supply Chain Compatible Machinery & Devices

Metal Plate Rolling Machine

Industrial machine for bending metal plates into cylindrical or conical shapes

Explore Specs →
Hydraulic Cylinder Piston Rod

Precision-machined rod that transmits force in hydraulic cylinders.

Explore Specs →
Metal Plate Bending Machine

Industrial machine for bending metal plates into angular shapes

Explore Specs →
Industrial Tube Bending Machine

CNC-controlled machine for precision bending of metal tubes and pipes

Explore Specs →

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 Specifications verified by CNFX Industrial Index (v2.6.03) for Fabricated Metal Product Manufacturing sector.

Get Quote for Disc/Seat Assembly

Request technical pricing, lead times, or customized specifications for Disc/Seat Assembly directly from verified manufacturing units.

Your business information is encrypted and only shared with verified Disc/Seat Assembly suppliers.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Thank you! Your message has been sent. We'll respond within 1–3 business days.

Need to Manufacture Disc/Seat Assembly?

Connect with verified factories specializing in this product category

Add Your Factory Contact Us
Previous Product
Cylindrical Shell
Next Product
Door Assembly