Socket Welding Flange

A Socket Welding Flange is a necked forged flange with an internal socket groove at one end. During installation, the steel pipe is inserted into the socket and secured with an external fillet weld, eliminating the need for beveling the pipe end or using a butt weld backing plate. The products are primarily manufactured according to ASME B16.5 standards, covering pressure ratings from Class 150 to Class 2500, making them the preferred detachable connection for small-diameter, high-pressure piping systems.

Standard Sealing Surface Types

1. RF (Raised Face): The industry mainstream type, compatible with spiral wound gaskets and PTFE gaskets, suitable for general operating conditions.

2. RJ (Ring Joint): Designed for extreme high temperature and high pressure conditions, compatible with metal ring gaskets.

3. MFM (Matching Face): Prevents gasket erosion and compression, improving sealing stability under harsh conditions.

Working Principle and Welding Process

1. Pipe Insertion: Insert the pipe into the socket until it contacts the internal step, then slightly retract to allow for thermal expansion clearance.

2. Fillet Welding: Perform continuous external fillet welds at the junction of the pipe outer wall and the flange neck.

3. Sealing and Stress Relief: The weld provides structural fixation and sealing; the internal clearance absorbs thermal expansion, preventing weld cracking.

4. Non-Destructive Testing: The weld can be subjected to PT penetration testing to ensure the precision sealing performance of critical small-diameter systems.

Core Structural Advantages

1. Self-centering Socket Welding Flange: The built-in socket welding flange enables automatic pipe alignment, simplifying installation and ensuring high coaxiality.

2. Integral Forged Structure: The one-piece forged neck design provides excellent rigidity and stable pressure resistance.

3. Efficient and Convenient Welding: Only external fillet welds are required, enabling fast construction and eliminating the need for full penetration welding.

4. Thermal Stress Protection: A dedicated expansion gap is provided at the bottom of the pipe to release high-temperature thermal stress and prevent joint failure.

Specifications and Material Options

1. Standard Sizes: Primarily DN15–DN50 (NPS 1/2″–2″), optimized for small-diameter high-pressure systems.

2. Pressure Ratings: Commonly used specifications are Class 300/600 and above, suitable for medium and high-pressure conditions.

3. Material Types: Available in ASTM A105 carbon steel, 304/316L stainless steel, alloy steel, and low-temperature forged steel.

Application Scenarios and Service Capabilities

DIYE VALVE Socket Welding Flanges are widely used in the oil and gas, chemical, power generation, and international engineering projects. We offer standard sizes in stock as well as fully customized solutions for non-standard sizes and special materials. Each product comes with a complete original manufacturer's quality inspection report, material certificate, flaw detection data, and a full set of export documents, ensuring full compliance with the requirements of various projects worldwide.

Technical Parameters