INDUSTRY COMPONENT

Bonnet Flange

A bonnet flange is a critical sealing component in valve assemblies that connects the valve body to the bonnet, ensuring pressure containment and operational integrity.

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

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bonnet Flange.

bonnet flange valve flange pressure boundary flange bolted flange connection valve sealing component industrial valve parts Bonnet Flange in Machinery and Equipment Manufacturing

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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.8 / 5.0 (25 reviews)

"Testing the Bonnet Flange now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Bonnet Flange meets all ISO standards."

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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