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U-Shape Section Stub Flange Butterfly Valve

U-Shape Section Stub Flange Butterfly Valve: Engineered for Demanding Piping Systems

For engineers and project managers seeking a robust and space-efficient solution for critical piping connections, the U-Shape Section Stub Flange Butterfly Valve stands out. This specialized valve design is engineered to bridge piping systems with different flange standards or to facilitate connections in tight spaces where traditional valves are impractical. Its defining feature is the integrally cast U-shaped section on one end, which acts as a sturdy stub for direct butt-welding to the pipeline, ensuring a permanent, leak-proof joint. The opposite end features a standard flange (commonly ANSI or DIN), allowing for a bolted connection to adjacent equipment. This hybrid design is particularly valuable in applications requiring a secure welded connection for integrity alongside the serviceability of a flanged joint. For systems requiring a compact assembly with similar benefits, consider exploring our Short Flange U-Section Butterfly Valve Assembly, which offers a pre-configured solution for specific spatial constraints.


The construction of the U-Shape Section Stub Flange Butterfly Valve prioritizes durability and reliable performance across various industrial settings. The valve body is typically crafted from high-grade materials like carbon steel (WCB), stainless steel (CF8/CF8M), or ductile iron, selected based on pressure rating and media compatibility. A precision-machined disc, often in a lug or wafer style design, provides excellent flow control with low torque operation. Critical sealing is achieved through a resilient seat, such as EPDM or Viton, which ensures tight shut-off against a wide range of fluids, gases, and slurries. The robust stem is designed for minimal deflection and is integrated with an operator—which can be a manual lever, gearbox, or pneumatic/electric actuator—to suit the required automation level. This valve excels in handling moderate to high-pressure applications in industries including chemical processing, power generation, water treatment, and offshore platforms, where its welded/flanged combination guarantees long-term service life and minimizes maintenance.

Key Specifications & Design Features

Size (NPS / DN) Face-to-Face (approx.) ANSI 150 W.P. (psi) ANSI 300 W.P. (psi) Standard Shaft Diameter
3" / DN80 4.5 in / 114 mm 285 740 1.25 in / 32 mm
6" / DN150 6.5 in / 165 mm 285 740 1.75 in / 45 mm
10" / DN250 9.5 in / 241 mm 285 740 2.5 in / 65 mm
14" / DN350 11.5 in / 292 mm 285 740 3.0 in / 75 mm
20" / DN500 15.0 in / 381 mm 285 740 4.0 in / 100 mm

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