How to choose the right gas butterfly valve

Update:29-12-2018
Summary:

Gas butterfly valve is one of the most important valves […]

Gas butterfly valve is one of the most important valves among many gas pipeline manufacturers. Its characteristic is that the valve is small in size and does not occupy space, and the opening and closing is flexible and the service life is longer. When the butterfly valve is in the fully open position, the thickness of the disc is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics.

The butterfly valve has two sealing types: a spring seal and a metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc. Valves with metal seals generally have a longer life than elastomeric seals, but are difficult to seal completely. Metal seals can accommodate higher operating temperatures, while elastomeric seals have temperature-limited defects. If a butterfly valve is required for flow control, the main choice is the correct size and type of valve.

The structural principle of the butterfly valve is especially suitable for making large diameter valves. Butterfly valves are widely used not only in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems for thermal power plants. Common butterfly valves are clip-on butterfly valves and flanged butterfly valves. The wafer type butterfly valve uses a stud bolt to connect the valve between the two pipe flanges.

The flange type butterfly valve has a flange on the valve, and the flanges on both ends of the valve are connected to the pipe flange by bolts. The strength properties of a valve are the ability of the valve to withstand the pressure of the medium. Valves are mechanical products that withstand internal pressure and must therefore have sufficient strength and rigidity to ensure long-term use without cracking or deformation.

The butterfly valve's disc is mounted in the diameter direction of the pipe. In the cylindrical passage of the butterfly valve body, the disc-shaped disc rotates around the axis, and the rotation angle is 0#176; between ~90°, when rotated to 90°, the valve is fully open. The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. And only need to rotate 90 & # 176; can be quickly opened and closed, easy to operate, and the valve has good fluid control characteristics.