Flange
A projecting rim with bolt holes used to connect a valve to piping. Raised Face (RF) is standard for most services. Ring Type Joint (RTJ) is used for high-pressure Class 600+. Flat Face (FF) is used with cast iron. Dimensions per ASME B16.5 (NPS 1/2"–24") or B16.47 (NPS 26"–60").
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Applicable Standards
Frequently Asked Questions
What is a Flange in a valve?
A projecting rim with bolt holes used to connect a valve to piping. Raised Face (RF) is standard for most services. Ring Type Joint (RTJ) is used for high-pressure Class 600+. Flat Face (FF) is used with cast iron. Dimensions per ASME B16.5 (NPS 1/2"–24") or B16.47 (NPS 26"–60").
What materials are used for the Flange?
Flange material selection depends on the process fluid, operating temperature and pressure, and required corrosion resistance. Standard materials include carbon steel (A216 WCB/A105), austenitic stainless steel (SS316/316L), and corrosion-resistant alloys (Hastelloy C-276, Inconel 625, duplex stainless steel 2205/2507) for aggressive service. All materials must be certified with EN 10204 Type 3.1 MTCs traceable to the heat number.
What standards govern the design of the Flange?
Valve component design is governed by ASME B16.34 for pressure-temperature ratings, API 600/602 for gate valves, API 609 for butterfly valves, and API 6D for pipeline valves, as applicable. Third-party inspection to these standards ensures compliance. Vajra Industrial Solutions supplies valves with full documentation packages including dimensional inspection records and material certificates.
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