INDUSTRY COMPONENT

Connection Flange

A standardized flange component for connecting outlet nozzles/ports with valves in industrial piping systems.

Component Specifications

Definition
A connection flange is a precision-engineered mechanical component designed to create a secure, leak-proof joint between an outlet nozzle/port and a valve in industrial fluid handling systems. It features bolt holes, sealing surfaces, and standardized dimensions to ensure proper alignment, pressure containment, and easy maintenance access.
Working Principle
The flange creates a mechanical connection by clamping two mating surfaces together with bolts, compressing a gasket between them to form a pressure-tight seal. It transfers mechanical loads while allowing controlled fluid flow between the nozzle and valve.
Materials
Carbon steel (ASTM A105), stainless steel (AISI 304/316), alloy steel, or ductile iron with corrosion-resistant coatings where required.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Face TypeRaised face (RF), flat face (FF), ring-type joint (RTJ)
Surface Finish125-250 µin Ra for sealing surfaces
Pressure Rating150-2500 PSI
Temperature Range-20°C to 400°C
Bolt Hole Quantity4, 8, 12, or 16 holes
Bolt Circle DiameterStandardized per ASME B16.5

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, ISO 7005-1, DIN 2501, EN 1092-1

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Gasket failure leading to leaks
  • Bolt over-torquing causing flange warpage
  • Corrosion in aggressive environments
  • Improper alignment causing stress concentrations
FMEA Triads
Trigger: Incorrect bolt torque sequence
Failure: Uneven gasket compression and leakage
Mitigation: Use calibrated torque wrenches and follow cross-pattern tightening procedures
Trigger: Thermal cycling without expansion joints
Failure: Flange cracking due to thermal stress
Mitigation: Install expansion loops/bellows and use flexible gaskets

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.8mm on bolt hole circle diameter, ±0.4mm on bolt hole diameter, flatness within 0.1mm across sealing surface
Test Method
Hydrostatic pressure testing per ASME B16.34, helium leak testing for critical services, visual inspection per ASME B16.5

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 Connection Flange

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Longan Flange
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What is the difference between raised face and flat face flanges?

Raised face flanges have a small raised section around the bore for gasket compression, while flat face flanges have full contact surfaces. RF is standard for higher pressure applications.

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

Select stainless steel (316 for chlorides) or apply protective coatings. Consider fluid chemistry, temperature, and pressure when specifying materials.

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.

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