The flange butterfly valve from Dexiang Group is a soft-seated, fully flanged concentric butterfly valve. The valve is engineered for industrial and water-work performance. Its flexible design uses a fully flanged body with a rubber seat for pressure stability and long-term shut-off, and the smaller body structure makes it simple to install and maintain.

Specifications

The size range is DN50 to DN600. The design standard is API 609 Category A, JIS 2032 and GB/T122383. The body style is full flanged, and the flange drilling follows API 609 Category A, ASME B16.1 Class 125, ASME B16.5 Class 150, EN 1092 PN6, PN10 and PN16, and JIS B2213. The testing standard is API 598, JIS B203 and GB/T13927.

The body material can be cast iron, ductile iron, WCB, stainless steel or AL-BR. The disc can be ductile iron, stainless steel or nylon coated. The seat can be EPDM, PTFE, NBR, FKM or Viton, and the stem is stainless steel SS410, SS420 or 2Cr13. The face-to-face dimensions follow ASME B16.5, JIS B2213 A and GB/T17241.6.

The maximum allowable operating pressure is 250 psi, or 17.2 bar. The temperature range is minus 29 to 120 degrees Celsius, depending on the seat and the application. The shut-off rating is bidirectional bubble-tight. The buyer should confirm the seat material and the temperature for the actual medium, because a seat that suits water may not suit steam or a chemical.

Features

The stem uses a circlip and retaining ring assembly. The anti-backlash assembly is secured inside the valve body by an internal circlip with a thrust washer, and it can be disassembled with professional tools. That design prevents accidental pull-out of the stem and keeps the disc position stable.

The stem is a precision hexagonal section that drives the disc without screws or pins. The extended valve body neck meets the 50 millimeter pipeline insulation requirement and provides space for actuator mounting. The stem bearing uses a corrosion-resistant PTFE or bronze bushing that absorbs lateral thrust under heavy loads. The stem seal combines self-adjusting V-ring packing with an O-ring for bidirectional sealing.

The disc has a spherical machined and hand-polished sealing surface. That surface gives bidirectional bubble-tight shut-off, reduces operating torque and extends the seat life. The valve also has a primary and secondary seal. The buyer should ask for the torque curve and the actuator sizing if the valve will be automated.

Applications

The valve is used for potable water, wastewater, seawater, HVAC, data centers, sugar and ethanol, and other industrial services. The product page also lists chemical, natural gas, power, metallurgical, oil, water conservancy, energy and HVAC industries in the solution menu. The buyer should match the body, disc and seat materials to the medium and the environment.

For a seawater or a desalination application, the buyer should confirm the corrosion resistance of the body and the disc. For an HVAC or a data center application, the buyer should confirm the pressure rating and the shut-off requirement. For a sugar or ethanol line, the buyer should confirm the seat compatibility with the process fluid.

The valve can be supplied with a pneumatic or electric actuator. The buyer should confirm the actuator torque, the control signal, the fail position and the mounting standard. A valve and an actuator that are sized separately can fail to work together, so the supplier should confirm the complete assembly.

Ordering Notes

The order should state the size, the pressure rating, the body and disc material, the seat material, the stem material, the flange standard, the actuator and the quantity. The buyer should also ask for the test report, the drawing and the warranty.

A sample or a bench test is the practical way to check the torque, the sealing and the actuator response. The buyer should keep the test record as the reference for the batch.

Dexiang can be contacted through the details on the product page. The buyer should send the medium, the pressure, the temperature and the pipe standard so that the supplier can recommend the valve and the actuator.

The flange butterfly valve is one part of a piping system, and the result depends on the valve, the seat, the actuator and the installation. A correct material and a bench test reduce the risk of a leak or a seized valve.