INDUSTRY COMPONENT

Closure Member (Gate/Ball/Plug)

Closure member for isolation valves that controls fluid flow through seating mechanisms.

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Component Specifications

Definition
A critical valve component that physically blocks or permits fluid passage in isolation valves. It includes gate, ball, or plug designs that move linearly or rotationally against a seat to create a seal. The closure member's geometry, surface finish, and material determine sealing effectiveness, pressure rating, and flow characteristics.
Working Principle
Operates by translational or rotational motion to engage with a stationary seat. Gate valves use a wedge-shaped disc that slides perpendicular to flow; ball valves rotate a spherical ball with a bore; plug valves employ a tapered or cylindrical plug with a port. All create a seal through mechanical interference and pressure-assisted contact.
Materials
Carbon steel (ASTM A216 WCB), stainless steel (316/304), brass, bronze, alloy steels, PTFE-coated metals, ceramic, or engineered polymers. Hardness: 150-400 HB. Surface finish: 0.4-1.6 μm Ra for metal seats, <0.8 μm for soft seats.
Technical Parameters
  • Leakage Class ANSI/FCI 70-2 Class IV-VI
  • End Connection Flanged, threaded, welded
  • Pressure Rating ANSI Class 150-2500
  • Actuation Torque 10-500 Nm
  • Temperature Range -50°C to 600°C
  • Flow Coefficient (Cv) 5-5000
Standards
ISO 5208, API 598, ASME B16.34, DIN 3230

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Closure Member (Gate/Ball/Plug).

valve closure member gate valve disc ball valve ball plug valve plug isolation valve component fluid control sealing Closure Member (Gate/Ball/Plug) Closure Member (Gate/Ball/Plug) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Isolation Valve

A valve used to completely isolate a section of piping or equipment from the rest of the system for maintenance, safety, or operational control.

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Engineering Analysis

Risks & Mitigation
  • Seat wear leading to leakage
  • Corrosion from aggressive media
  • Mechanical failure under cyclic loading
  • Improper installation causing misalignment
FMEA Triads
Trigger: Abrasive particles in fluid flow
Failure: Erosion of sealing surfaces
Mitigation: Use hardened materials, install upstream filters, implement regular inspection schedules
Trigger: Thermal cycling
Failure: Differential expansion causing binding
Mitigation: Select materials with similar thermal coefficients, design with clearance allowances, use expansion joints

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ISO 2768-m, sealing surface flatness within 0.0005 mm/mm
Test Method
Hydrostatic shell test at 1.5x rated pressure, seat leakage test per ISO 5208

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 gate, ball, and plug closure members?

Gate members slide linearly for on/off service with minimal pressure drop; ball members rotate 90° for quick operation; plug members provide tight sealing with tapered designs for throttling applications.

How do material choices affect closure member performance?

Materials determine corrosion resistance, temperature limits, and wear characteristics. Stainless steel offers corrosion resistance, carbon steel provides strength for high pressure, while coated surfaces enhance sealing in abrasive services.

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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Closure Member Closure System