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INDUSTRY COMPONENT

Disc/Clapper

Disc/Clapper is the sealing element in check valves that prevents backflow by closing against the seat when flow reverses.

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Component Specifications

Definition

The Disc/Clapper is a critical component in check valve assemblies, typically a hinged or guided plate that moves in response to fluid pressure differentials. It opens when forward flow pressure exceeds the cracking pressure and closes automatically when flow stops or reverses, creating a tight seal against the valve seat to prevent backflow. This component ensures unidirectional flow control in piping systems.

Working Principle

Operates on differential pressure: forward flow lifts the disc away from the seat, allowing fluid passage; cessation or reversal of flow causes the disc to return to the seat via gravity, spring force, or backpressure, creating a seal.

Materials

Stainless steel (304, 316), carbon steel, brass, bronze, duplex steel, or engineered polymers (PTFE, Nylon) depending on application requirements.

Technical Parameters

Diameter 10-600 mm
Pressure Rating PN10-PN100
Cracking Pressure 0.1-1.0 bar
Temperature Range -20°C to 200°C

Standards

ISO 5208, DIN EN 12266, API 598

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Disc/Clapper.

Parent Products

This component is used in the following industrial products

Check Valve Assembly

A valve assembly that allows fluid flow in one direction only, preventing backflow in piping systems.

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Engineering Analysis

Risks & Mitigation

Seal failure leading to backflow
Wear from particulate matter
Corrosion in aggressive environments
Water hammer from rapid closure

FMEA Triads

Trigger: Material degradation from chemical attack
Failure: Leakage due to compromised sealing surface
Mitigation: Select corrosion-resistant materials and implement regular inspection

Trigger: Particulate accumulation on seating surface
Failure: Incomplete closure and backflow
Mitigation: Install upstream filtration and schedule maintenance cleaning

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Seating surface flatness within 0.05 mm, dimensional tolerances per ISO 2768-m

Test Method

Hydrostatic seat leakage test per ISO 5208, shell test per API 598

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 is the difference between a disc and a clapper in check valves?

Disc typically refers to a flat sealing element, while clapper often describes a hinged disc that swings open/closed. In practice, the terms are frequently used interchangeably for the moving sealing component.

How do I select the right Disc/Clapper material?

Consider fluid compatibility, temperature, pressure, corrosion resistance, and wear characteristics. Common choices include stainless steel for general use, brass for water applications, and polymers for chemical resistance.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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.