INDUSTRY COMPONENT

Valve Disc/Plate

A valve disc/plate is a critical sealing component in valve units that controls fluid flow by opening, closing, or modulating passageways.

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Component Specifications

Definition
The valve disc or plate is a precisely engineered component within valve assemblies that serves as the primary flow control element. It moves relative to the valve seat to regulate, isolate, or direct fluid flow in pipelines and systems. This component is subjected to pressure differentials, temperature variations, and mechanical stresses during operation, requiring precise geometry, surface finish, and material properties to ensure reliable sealing and minimal leakage.
Working Principle
The valve disc operates by translational or rotational movement against a stationary seat. When closed, it creates a seal through mechanical contact or pressure-assisted deformation, blocking fluid passage. During opening, it retracts to allow controlled flow. The sealing mechanism can be metal-to-metal, soft-seated with elastomers, or a combination, depending on design requirements for pressure class, temperature, and media compatibility.
Materials
Common materials include stainless steel (304, 316), carbon steel (A105), brass, bronze, duplex steels, and specialized alloys like Monel or Hastelloy for corrosive environments. Soft-seated discs may incorporate PTFE, reinforced elastomers, or graphite. Material selection depends on pressure rating (ANSI Class 150-2500), temperature range (-200°C to 800°C), and fluid compatibility (water, oil, gas, chemicals).
Technical Parameters
  • Hardness 150-400 HB depending on material
  • Diameter Range 10mm to 2000mm
  • Surface Finish Ra 0.4μm to 3.2μm
  • Pressure Rating Up to 2500 PSI
  • Temperature Range -50°C to 425°C
  • Flatness Tolerance 0.01mm per 100mm
Standards
ISO 5208, API 598, ASME B16.34, DIN 3230

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Valve Disc/Plate.

valve disc valve plate sealing component flow control industrial valves pressure rating valve seat ANSI standards ISO 5208 Valve Disc/Plate Valve Disc/Plate in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Valve Units

Control components within tray systems that regulate flow, pressure, or direction of materials.

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Engineering Analysis

Risks & Mitigation
  • Seal failure leading to leakage
  • Corrosion or erosion damage
  • Mechanical binding or sticking
  • Thermal deformation under extreme temperatures
  • Fatigue cracking from cyclic operation
FMEA Triads
Trigger: Improper material selection for corrosive media
Failure: Premature corrosion and pitting
Mitigation: Conduct material compatibility analysis and select corrosion-resistant alloys with appropriate certifications
Trigger: Excessive operating torque
Failure: Mechanical deformation or seizure
Mitigation: Implement torque limiters, proper lubrication, and regular maintenance schedules

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ASME B16.34, surface finish per ISO 4288, leakage rates per ISO 5208 Class A to D
Test Method
Hydrostatic/pneumatic testing per API 598, material verification per ASTM standards, NDE methods (PT, MT, UT) for critical applications

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 valve disc and a valve plate?

The terms are often used interchangeably, but 'disc' typically refers to rotating components in butterfly or ball valves, while 'plate' may describe sliding components in gate or globe valves. Both function as the movable sealing element.

How often should valve discs be inspected?

Inspection frequency depends on service conditions: annually for critical applications, every 2-3 years for standard services. Signs of wear, corrosion, or leakage indicate immediate inspection needs.

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.

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