Valve Disc/Plate: Diameter Range 10mm to 2000mm

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

Parameter	Typical range	Notes & selection driver
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

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 5208, API 598, ASME B16.34, DIN 3230

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

Typical Suppliers & Equivalents

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

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Valve Disc/Plate

Manufacturer profiles associated with Valve Disc/Plate.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

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.

Valve Disc/Plate