INDUSTRY COMPONENT

Body Flanges

Body flanges are critical sealing components in control valve assemblies that connect valve bodies to pipelines while maintaining pressure integrity.

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Component Specifications

Definition
Body flanges are precision-machined interface components in control valve systems that provide a bolted connection between the valve body and adjacent piping. They feature standardized bolt patterns, gasket surfaces, and pressure ratings to ensure leak-proof sealing under varying operational conditions including temperature fluctuations, pressure differentials, and fluid dynamics. These flanges serve as both structural supports and sealing interfaces in industrial fluid handling systems.
Working Principle
Body flanges create a sealed interface through compressive force applied by bolts, which compresses a gasket between mating surfaces to prevent fluid leakage. The flange faces are machined to specific surface finishes (typically Ra 3.2-6.3 μm) to optimize gasket compression and sealing effectiveness while maintaining alignment and structural integrity under operational stresses.
Materials
Common materials include ASTM A105 carbon steel, ASTM A182 F304/F316 stainless steel, duplex stainless steels (2205), and alloy steels (A350 LF2). Material selection depends on service conditions: pressure rating (Class 150-2500), temperature range (-196°C to 538°C), and fluid compatibility (corrosive/erosive media).
Technical Parameters
  • Face Type Raised face (RF), Ring-type joint (RTJ), Flat face (FF)
  • Surface Finish 125-250 AARH (3.2-6.3 μm Ra)
  • Pressure Rating ANSI Class 150-2500
  • Temperature Range -196°C to 538°C (material dependent)
  • Bolt Circle Diameter As per ASME B16.5 standards
  • Dimensional Standard ASME B16.5, EN 1092-1
Standards
ASME B16.5, EN 1092-1, API 6D, ISO 7005-1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Body Flanges.

control valve flanges valve body flanges industrial flanges ANSI flange standards pressure sealing components fluid control fittings Body Flanges Body Flanges in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Control Valve Body

The main structural housing of a control valve that contains and supports the internal flow control components.

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Engineering Analysis

Risks & Mitigation
  • Gasket blowout under pressure surges
  • Stress corrosion cracking in chloride environments
  • Bolt fatigue from thermal cycling
  • Misalignment causing uneven gasket compression
FMEA Triads
Trigger: Improper bolt torque sequence or insufficient preload
Failure: Uneven gasket compression leading to leakage paths
Mitigation: Implement calibrated torque wrench procedures with cross-pattern tightening sequence; use strain-controlled bolting methods for critical services
Trigger: Thermal cycling exceeding material expansion coefficients
Failure: Flange warping or bolt relaxation causing joint integrity loss
Mitigation: Specify materials with matched thermal expansion; incorporate flexible gasket designs; implement regular thermal cycle monitoring

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.8 mm on bolt circle diameter, ±0.4 mm on bolt hole spacing, flatness within 0.1 mm across sealing surface
Test Method
Hydrostatic testing per API 598 (1.5x rated pressure), helium leak testing for critical services, liquid penetrant examination per ASME V Article 6

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 are the main differences between RF and RTJ flange faces?

RF (Raised Face) flanges have a raised sealing surface with serrations for gasket compression, suitable for most applications. RTJ (Ring-Type Joint) flanges have a groove for metal ring gaskets, providing superior sealing for high-pressure/temperature services (typically above Class 900).

How do I select the correct flange material for corrosive service?

Material selection requires evaluating fluid composition, temperature, pressure, and corrosion mechanisms. Stainless steel (316/316L) resists general corrosion, duplex steels handle chloride stress corrosion, and alloy coatings protect against specific chemical attacks. Always consult NACE MR0175 for sour service applications.

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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