Closure Member: Temperature Range -50°C to 400°C

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 5208, API 598, ASME B16.34, DIN 3230

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Closure Member

Manufacturer profiles associated with Closure Member.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Closure Member