Precautions on the Selection of Butterfly Valve

The butterfly plate of the butterfly valve is installed in the diametrical direction of the pipe. In the cylindrical channel of sanitary butterfly valve body, a disc-shaped butterfly plate rotates around the axis. The rotation angle is between 0 and 90 degrees. When it rotates to 90 degrees, the valve is in a fully open state.

The butterfly valve has a simple structure, a small in size, and is lightweight. It is composed of a few parts. And it only needs to rotate 90 degrees to quickly open and close, so the operation is simple. And the valve has good fluid control characteristics.

When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance for the medium when it flows through the valve body. Therefore, the pressure drop caused by the valve is very small, so it has good flow control characteristics.

There’re two types of sealing: elastic sealing and metal sealing.

For an elastic sealing valve, the sealing ring can be embedded in the valve body or attached to the peripherals of the butterfly plate. The service life of valves using metal sealing is usually longer than that of the valves using elastic sealing, but it is difficult to achieve complete sealing.

Valves using metal sealing can tolerate high operating temperatures, while valves using elastic sealing have the disadvantage of being limited to the temperature. If the butterfly valve is used for flow control, it’s important to properly select the size and type of the valve.

The structural mechanism of the butterfly valve is especially suitable for the production of large diameter valves. Butterfly valves are not only widely used in oil, gas, chemicals, water treatment, and other industries, but also used in the water cooling system of thermal power plants.

Commonly used butterfly valves are clamp-type butterfly valves and flange-type butterfly valves. Clamp type butterfly valve uses a double-headed bolt to connect the valve between the two pipe flanges. Flange type butterfly valve uses a bolt to connect the flanges at both ends of the valve to the pipe flange.

Valve’s strength performance refers to its capacity to sustain the pressure of the medium. Valve is a mechanical product that is subject to internal pressure, so it must have sufficient strength and rigidity to ensure long-term use without cracking or deformation.