The Selection and Application of Butterfly Valves

The butterfly valve is suitable for flow regulation. Because the pressure loss of butterfly valves in the pipeline is relatively large (it is about three times that of gate valves), the influence of the pressure loss on pipe systems should be fully considered when the butterfly valve is to be selected. Also, take into consideration the firmness of the disc bearing the pressure of the medium in the pipe when the valve is closed. In addition, Consider the limitation of the working temperature of the elastic valve seat material at high temperature.

The butterfly valve has a short structure length, fast opening and closing speed and good fluid control characteristics. The structure principle of butterfly valves is suitable for making valves with a large diameter. Generally, when a valve is used for throttling, regulation and mud, the valve structure length is required to be short and the valve has fast opening and closing speed, so the butterfly valve is recommended.

When the butterfly valve is used for throttling and regulation under special working conditions, strict sealing is required, or the valves are used under the conditions of severe wear, low temperature (cryogenic process), etc., triple eccentric or double eccentric butterfly valves with special designed metal seals and adjusting devices should be used.

The centerline type butterfly valve is suitable for the pipeline requiring complete sealing, zero leakage in gas tests, long service life and working temperature ranging from -10℃ to 150℃, such as the pipeline transporting fresh water, sewage, seawater, brine solutions, steam, gas, food, pharmaceuticals, oil products.

The soft seal eccentric butterfly valve is suitable for bidirectional opening and closing and regulation of ventilation and dust extraction pipes, and is widely used in gas pipelines of metallurgy, light industry, electric power and petrochemical systems.

As a regulating and cut-off device, the metal-to-metal linear seal double eccentric butterfly valve is suitable for pipelines of the urban heat supply, the steam supply, the water supply, gas, oil products, acid and alkali, etc.

The metal-to-metal face seal triple eccentric butterfly valve can be used as a program control valve for large pressure swing adsorption (PSA) gas separation devices, and can also be widely used in petroleum, petrochemical industry, chemical industry, metallurgy, electric power and other fields. Thus, this butterfly valve is a good substitute for gate valves and globe valves.