INDUSTRY COMPONENT

Valve Disc

A valve disc is the movable sealing element in a pressure reducing valve that regulates downstream pressure by modulating flow through the valve seat.

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Component Specifications

Definition
The valve disc is a critical component in pressure reducing valves, designed to maintain a constant downstream pressure regardless of upstream fluctuations. It functions as the primary sealing and modulating element, moving in response to pressure differentials to open or close the flow path through the valve seat. Precision-engineered for tight sealing and smooth operation, it directly impacts valve performance, efficiency, and reliability in industrial fluid systems.
Working Principle
The valve disc operates on a force-balance principle. Downstream pressure acts on a diaphragm or piston connected to the disc, opposing a spring force. When downstream pressure drops below the setpoint, the spring pushes the disc away from the seat, increasing flow to raise pressure. Conversely, rising downstream pressure compresses the spring, moving the disc toward the seat to reduce flow and lower pressure, maintaining a stable output.
Materials
Stainless steel (AISI 316, 304), brass (C36000), bronze (C93200), or engineered polymers (PTFE, PEEK) for corrosion resistance, durability, and compatibility with fluids (water, steam, gases, chemicals). Hardened surfaces or coatings (e.g., Stellite) may be applied for wear resistance in high-pressure or abrasive applications.
Technical Parameters
  • Diameter 10-200 mm
  • Leakage Class ANSI/FCI 70-2 Class IV or VI
  • Surface Finish Ra ≤ 0.8 μm for sealing surfaces
  • Pressure Rating Up to 600 psi (4.1 MPa)
  • Temperature Range -20°C to 200°C
Standards
ISO 5208, DIN 3230, ASME B16.34

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Valve Disc.

valve disc pressure reducing valve component fluid control industrial valve parts sealing element pressure regulation valve maintenance Valve Disc in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Pressure Reducing Valve

A valve that automatically reduces a higher inlet pressure to a steady lower outlet pressure regardless of flow variations.

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Safety Relief Valve

A pressure relief device designed to automatically open and discharge fluid when pressure exceeds a predetermined set point to prevent equipment failure.

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Disc/Valve Mechanism

The core sealing and flow control component within a steam trap that opens and closes to discharge condensate while preventing steam loss.

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Engineering Analysis

Risks & Mitigation
  • Leakage due to wear or improper seating
  • Corrosion from incompatible fluids
  • Cavitation damage in high-pressure drops
  • Sticking from debris or misalignment
FMEA Triads
Trigger: Abrasive particles in fluid
Failure: Erosion of disc sealing surface
Mitigation: Use hardened materials, install upstream filters, and implement regular inspection schedules.
Trigger: Corrosive fluid exposure
Failure: Material degradation and leakage
Mitigation: Select corrosion-resistant materials (e.g., stainless steel, PTFE) and apply protective coatings.
Trigger: Improper installation or alignment
Failure: Uneven wear and reduced sealing efficiency
Mitigation: Follow manufacturer guidelines, use alignment tools, and train personnel on correct assembly procedures.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ISO 2768-m, sealing surface flatness within 0.025 mm
Test Method
Pressure testing per ISO 5208, leakage tests with air or water at specified pressures, material verification via spectroscopy or certification

Buyer Feedback

★★★★☆ 4.8 / 5.0 (8 reviews)

"Found 54+ suppliers for Valve Disc on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Valve Disc is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Valve Disc so far."

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Frequently Asked Questions

What is the main function of a valve disc in a pressure reducing valve?

The valve disc modulates flow through the valve seat to maintain a constant downstream pressure by opening or closing in response to pressure changes.

How do I select the right material for a valve disc?

Choose based on fluid compatibility, pressure, temperature, and corrosion requirements—e.g., stainless steel for general use, PTFE for chemicals, or coated alloys for high wear.

What are common failure modes of valve discs?

Wear, corrosion, erosion, or fouling can cause leakage, sticking, or inaccurate pressure control, requiring inspection and replacement.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Valve Body / Housing Valve Disc/Ball