INDUSTRY COMPONENT

Disc/Ball

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

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Component Specifications

Definition
The Disc/Ball is a critical sealing component in check valves, designed to move freely within the valve body to allow unidirectional flow. When fluid flows in the forward direction, pressure lifts the disc/ball from its seat; when flow reverses or stops, gravity or backpressure forces it back against the seat, creating a tight seal to prevent backflow. This component ensures system integrity by maintaining pressure and preventing contamination in pipelines.
Working Principle
The Disc/Ball operates on a simple mechanical principle: it responds to fluid pressure differentials. Forward flow creates pressure that displaces the component from its seat, allowing passage. Reverse flow or absence of forward pressure causes the disc/ball to return to its seated position, blocking the flow path. In swing check valves, a hinged disc pivots; in ball check valves, a spherical ball moves linearly; both rely on fluid dynamics and gravity for operation.
Materials
Common materials include stainless steel (e.g., AISI 316 for corrosion resistance), brass (for low-pressure applications), carbon steel (for high-strength needs), and engineered polymers like PTFE or Nylon (for chemical compatibility). Material selection depends on fluid type, pressure, temperature, and environmental conditions.
Technical Parameters
  • Diameter 10-500 mm
  • Seal Type Metal-to-metal or soft-seat (e.g., elastomer)
  • Pressure Rating Up to 6000 psi
  • Temperature Range -50°C to 400°C
  • Flow Coefficient (Cv) Varies by size and design
Standards
ISO 5208, DIN 3230, ASME B16.34

Industry Taxonomies & Aliases

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

check valve disc valve ball backflow prevention sealing component fluid control industrial valves swing check valve ball check valve Disc/Ball Disc/Ball in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Check Valves

One-way valves that prevent backflow in fluid systems

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Check Valves (Inlet & Outlet)

One-way valves that prevent backflow in pump fluid systems

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Engineering Analysis

Risks & Mitigation
  • Seal failure leading to backflow
  • Corrosion or wear from abrasive fluids
  • Sticking due to debris accumulation
  • Water hammer from rapid closure
FMEA Triads
Trigger: Material degradation from chemical exposure
Failure: Loss of sealing, causing backflow and system contamination
Mitigation: Use corrosion-resistant materials like stainless steel or coatings; implement regular inspection and replacement schedules.
Trigger: Debris buildup on seating surface
Failure: Disc/Ball fails to close fully, allowing leakage
Mitigation: Install filters upstream; design valves with self-cleaning features; perform routine maintenance.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Seating surface flatness within 0.001 inches per inch; dimensional tolerances per ISO 2768-m
Test Method
Pressure testing per ISO 5208 for leakage rates; material certification per ASTM standards; functional testing under simulated flow conditions.

Buyer Feedback

★★★★☆ 4.6 / 5.0 (17 reviews)

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

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

"The Disc/Ball we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements."

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Frequently Asked Questions

What is the difference between a disc and a ball in check valves?

A disc is typically a flat or slightly curved plate used in swing check valves, pivoting on a hinge; a ball is spherical and used in ball check valves, moving linearly. Discs suit larger pipelines, while balls offer quicker response in smaller systems.

How do I select the right material for a Disc/Ball?

Consider fluid compatibility (e.g., stainless steel for corrosive fluids), pressure and temperature ratings, and industry standards. Consult valve specifications and conduct material testing if needed.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Disc Holder/Stem Disc/Seat