Butterfly valves are suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, the robustness of the butterfly plate to bear the pressure of the pipeline medium when it is closed should also be considered. In addition, consideration must be given to the operating temperature limitations of the resilient seat material at high temperatures. Butterfly valve structure length and overall height is small, open and close fast, and has good fluid control characteristics, the structure principle of the butterfly valve is most suitable for the production of large diameter valve. When the butterfly valve is required to control the flow, the most important thing is to choose the correct size and type of the butterfly valve, so that it can work properly and effectively.
In general, in throttling, regulating and mud media, short structure lengths and fast opening and closing speeds (1/4 RPM) are required. Low pressure cut-off (low pressure difference), recommended to choose butterfly valve.
Butterfly valve can be selected when double adjustment, shrinkage, low noise, cavitation and gasification phenomenon, a small amount of leakage to the atmosphere, and abrasive medium.
In special working conditions throttling adjustment, or strict sealing, or severe wear, low temperature (cold) and other working conditions when the use of butterfly valve, it is necessary to use a special design of metal seal belt regulating device three eccentric or double eccentric special butterfly valve.
Butterfly valve is suitable for requirements to achieve complete sealing, gas test leakage is zero, high life requirements, working temperature in -10 degrees ~ 150 degrees of fresh water, sewage, seawater, salt water, steam, natural gas, food, medicine, oil and all kinds of acid and alkali and other pipeline.
Eccentric butterfly valve is suitable for bidirectional opening and closing and regulation of ventilation and dust removal pipeline, widely used in metallurgical, light industry, electric power, petrochemical system of gas pipeline and waterway.
Metal-to-metal wire sealing double eccentric butterfly valve is suitable for city heating, gas supply, water supply and other gas, oil, acid and alkali pipelines, as a regulating and throttling device.
Metal-to-metal surface sealing triple eccentric butterfly valve is not only used as a program control valve for large pressure swing adsorption (PSA) gas separation device, but also widely used in petroleum, petrochemical, chemical, metallurgy, electric power and other fields, a good substitute for gate valves, globe valves.