INDUSTRY COMPONENT

Closure Member

A closure member is the sealing component within an isolation valve that creates a leak-tight barrier to control fluid flow in industrial systems.

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Component Specifications

Definition
The closure member is the critical sealing element in isolation valves that physically blocks or permits fluid flow through the valve body. It moves between open and closed positions via valve actuation mechanisms, creating a positive seal against the valve seat to prevent leakage. This component directly interfaces with the process media and must maintain integrity under varying pressure, temperature, and chemical conditions.
Working Principle
The closure member operates by translational or rotational movement against a stationary valve seat. When actuated to the closed position, it creates compressive force against the seat surface, forming a mechanical seal that prevents fluid passage. Different designs include gate, globe, ball, and butterfly configurations, each with specific movement patterns and sealing characteristics.
Materials
Stainless steel (316/304), carbon steel, brass, bronze, alloy steels, PTFE, reinforced polymers, elastomers (EPDM, Viton), ceramic coatings. Material selection depends on media compatibility, temperature range (-50°C to 400°C), pressure rating, and corrosion resistance requirements.
Technical Parameters
  • Leakage Class ANSI/FCI 70-2 Class IV-VI
  • Surface Finish Ra 0.4-3.2 μm
  • Pressure Rating ANSI Class 150-2500, PN10-PN420
  • Temperature Range -50°C to 400°C
  • Dimensional Standards ASME B16.34, API 600
Standards
ISO 5208, API 598, ASME B16.34, DIN 3230

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Closure Member.

valve closure member isolation valve seal industrial valve component fluid control sealing gate valve disc ball valve ball butterfly valve disc valve trim Closure Member Closure Member in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Isolation Valves

Valves used to completely shut off fluid flow in cooling water systems for maintenance, repair, or isolation of sections.

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Engineering Analysis

Risks & Mitigation
  • Seal failure leading to leakage
  • Corrosion from process media
  • Mechanical wear reducing sealing effectiveness
  • Thermal expansion mismatch causing binding
  • Cavitation damage in high-velocity applications
FMEA Triads
Trigger: Material degradation from chemical attack
Failure: Loss of sealing surface integrity
Mitigation: Select corrosion-resistant materials, apply protective coatings, implement regular inspection schedules
Trigger: Excessive mechanical wear from abrasive media
Failure: Increased clearance and leakage
Mitigation: Use hardened surfaces, implement filtration systems, design for easy replacement
Trigger: Thermal cycling stress
Failure: Cracking or distortion of sealing surfaces
Mitigation: Select materials with compatible thermal expansion, design for thermal stress relief, control operating temperature ranges

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per ASME B16.34, surface finish Ra ≤ 0.8 μm for metal seats, concentricity within 0.05 mm
Test Method
Pressure testing per ISO 5208, helium leak testing for critical applications, seat leakage testing per API 598

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 a closure member and a valve seat?

The closure member is the moving component that contacts the stationary valve seat to create the seal. The seat is the fixed surface against which the closure member seals.

How do I select the right closure member material for corrosive applications?

Consider media chemistry, concentration, temperature, and pressure. Common choices include 316 stainless steel for general corrosion, Hastelloy for severe chemicals, and PTFE-coated components for aggressive environments.

What maintenance is required for closure members?

Regular inspection for wear, corrosion, and surface damage; cleaning to remove deposits; lubrication of moving parts; and replacement when leakage exceeds allowable rates or surface degradation compromises sealing.

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 Element Closure Member (Gate/Ball/Plug)