Bonnet Flange: Temperature Range -50°C to 540°C

Component Specifications

Definition

The bonnet flange is a precision-machined flange component that forms the interface between the valve body and bonnet in industrial valves. It provides a secure, leak-proof connection through bolting and gasket sealing, allowing for maintenance access to internal valve components while maintaining system pressure integrity. This component is essential for pressure boundary containment in various valve types including gate, globe, and check valves.

Working Principle

The bonnet flange operates on the principle of bolted joint integrity and gasket compression sealing. When properly torqued, the flange creates a uniform compressive force on the gasket material, forming a pressure-tight seal that prevents fluid leakage while allowing for disassembly when maintenance is required. The flange distributes bolt loads evenly across the sealing surface to maintain consistent gasket compression under varying pressure and temperature conditions.

Materials

Common materials include ASTM A105 carbon steel, ASTM A182 F304/F316 stainless steel, ASTM A350 LF2 low-temperature carbon steel, and ASTM A694 F60 high-yield strength steel. Material selection depends on service conditions including pressure, temperature, and fluid compatibility.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Face Type	Raised face (RF), Ring-type joint (RTJ), Flat face (FF)
Surface Finish	125-250 µin Ra for gasket seating surfaces
Pressure Rating	Class 150 to Class 2500
Temperature Range	-50°C to 540°C
Bolt Circle Diameter	As per ASME B16.5 standards

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

Standards

ASME B16.5, ASME B16.47, ISO 7005-1, DIN 2633

Parent Products

This component is used in the following industrial products

Valve Housing/Body

The structural enclosure that contains and supports the internal components of a valve within an air distribution system.

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Engineering Analysis

Risks & Mitigation

Gasket blowout under overpressure conditions
Bolt relaxation leading to joint leakage
Corrosion at flange-gasket interface
Improper bolt torque causing uneven gasket compression

FMEA Triads

Trigger: Insufficient bolt torque during assembly
Failure: Gasket compression loss leading to fluid leakage
Mitigation: Implement calibrated torque procedures and periodic bolt retorquing schedules

Trigger: Thermal cycling causing differential expansion
Failure: Flange warpage and loss of sealing integrity
Mitigation: Use appropriate flange materials with matching thermal expansion coefficients and consider flexible gasket designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Flange dimensions per ASME B16.5 Table 5 with face flatness within 0.8mm across diameter

Test Method

Hydrostatic pressure testing per API 598 or ISO 5208 standards with visual inspection for leaks

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

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Manufacturers of Bonnet Flange

Manufacturer profiles associated with Bonnet Flange.

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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 primary function of a bonnet flange in valve assemblies?

The primary function is to provide a secure, pressure-tight connection between the valve body and bonnet while allowing for maintenance access to internal components.

How does gasket selection affect bonnet flange performance?

Gasket selection is critical as it must match the flange material, surface finish, and service conditions to ensure proper compression and sealing under varying pressure and temperature cycles.

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.

Bonnet Flange