INDUSTRY COMPONENT

Valve Disc/Ball

A precision sealing element in inlet/outlet valves that regulates fluid flow by rotating or lifting to open/close the flow path.

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Component Specifications

Definition
The valve disc or ball is the primary sealing and flow-regulating component within inlet and outlet valves. It functions as a movable element that interfaces with the valve seat to create a tight seal when closed and provides controlled flow passage when open. In ball valves, it's a spherical element with a through-hole; in disc valves, it's a flat or tapered plate that rotates or lifts perpendicular to the flow direction. This component directly determines valve performance metrics including shut-off capability, flow coefficient (Cv), pressure drop, and service life.
Working Principle
The disc/ball operates by mechanical actuation (manual, pneumatic, or electric) to rotate or lift, changing its position relative to the valve seat. In the closed position, it creates a metal-to-metal or soft-seated seal against the seat, preventing fluid passage. When opened, it aligns its flow passage with the valve body ports, allowing controlled fluid movement. The sealing mechanism relies on precise machining, surface finish, and material compatibility to maintain integrity under varying pressures and temperatures.
Materials
Stainless steel (316/304), carbon steel, brass, alloy steels, or engineered polymers. Sealing surfaces may include hardened coatings (stellite, tungsten carbide) or elastomeric inserts (PTFE, EPDM, Viton) for enhanced sealing.
Technical Parameters
  • Diameter 10-500 mm
  • Leakage Class ANSI/FCI 70-2 Class IV-VI
  • Surface Finish Ra 0.4-1.6 μm
  • Pressure Rating PN10 to PN420 (150-2500 psi)
  • Temperature Range -50°C to +450°C
  • Flow Characteristic Equal percentage/Quick opening
Standards
ISO 5211, ISO 17292, API 608, ASME B16.34, DIN 3352

Industry Taxonomies & Aliases

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

valve disc valve ball inlet valve component outlet valve part flow control element industrial valve sealing ball valve component disc valve part Valve Disc/Ball Valve Disc/Ball in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Inlet/Outlet Valves

Valves controlling fluid entry and exit in dosing pumps

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Valves (Suction & Discharge)

Critical flow control components in mud pumps that regulate the intake and output of drilling fluid.

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Engineering Analysis

Risks & Mitigation
  • Seal degradation under thermal cycling
  • Cavitation erosion in high-velocity flows
  • Gallling in metal-to-metal seals
  • Corrosion in chemical service
  • Mechanical failure from over-torque
FMEA Triads
Trigger: Improper material selection for fluid service
Failure: Corrosion or chemical attack leading to seal leakage
Mitigation: Implement material compatibility charts and specify per ASTM/GOST standards; use corrosion-resistant alloys or coatings.
Trigger: Excessive actuation torque
Failure: Stem/disc connection failure or seat damage
Mitigation: Install torque limiters on actuators; follow manufacturer's torque specifications during assembly.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ISO 2768-m; sealing surface flatness within 0.01 mm; surface roughness Ra ≤ 0.8 μm for metal seats
Test Method
Hydrostatic/pneumatic seat leakage test per API 598; material certification per EN 10204 3.1; NDE per ASME Section V

Buyer Feedback

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"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Valve Disc/Ball arrived with full certification."

"Great transparency on the Valve Disc/Ball components. Essential for our Machinery and Equipment Manufacturing supply chain."

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Frequently Asked Questions

What is the difference between a valve disc and a valve ball?

A valve disc is typically a flat or tapered plate that rotates or lifts perpendicular to flow (common in butterfly or globe valves), while a valve ball is spherical with a through-hole that rotates 90° to align with flow (exclusive to ball valves). Discs offer better throttling control; balls provide faster operation and higher flow capacity.

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

Material selection depends on fluid compatibility, pressure-temperature conditions, and wear resistance. Use stainless steel for corrosive fluids, carbon steel for high-pressure steam, and coated/elastomer-seated versions for bubble-tight sealing. Always verify against industry standards like NACE MR0175 for sour service.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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