Butterfly valve for flow control. As the butterfly valve pressure loss in the pipeline is relatively large, about three times the gate valve, so the choice of butterfly valve, piping system should be fully taken into account the impact of pressure loss, but also consider the pressure on the butterfly plate to withstand the pressure off the firm Sex. In addition, the operating temperature of the elastomeric seat material must also be considered at high temperatures. Butterfly valve structure length and overall height is small, open and close fast, and has good fluid control characteristics, the butterfly valve structure principle is most suitable for the production of large-caliber valves. When a butterfly valve is required for control flow, it is of paramount importance that the correct size and type of butterfly valve be chosen so that it functions properly and effectively. In general, in the throttling, regulation and control of mud medium, requiring short structural length, opening and closing speed (1/4 turn). Low-pressure cut-off (pressure difference is small), the recommended choice of butterfly valve. In the two-bit regulation, narrow channel, low noise, cavitation and gasification phenomenon, a small amount of leakage to the atmosphere, with abrasive media, you can choose butterfly valve. In special operating conditions, throttling regulation, or require strict sealing, or severe wear and tear, cryogenic (cryogenic) conditions such as the use of butterfly valves, the need to use special design metal seal with the adjustment device to three eccentric or double eccentric Butterfly valve. The middle-line butterfly valve is suitable for fresh water, sewage, seawater, salt water, steam, natural gas, food, medicine, oil and so on which are required to be completely sealed, have zero gas test leak, high life expectancy and working temperature of -10 degrees to 150 degrees Acid and alkali and other pipelines. Eccentric butterfly valve soft seal for ventilation dust removal pipeline bidirectional opening and closing and regulation, are widely used in metallurgy, light industry, electricity, petrochemical systems, gas pipelines and waterways. Metal to metal wire sealing double eccentric butterfly valve is suitable for urban heating, gas supply, water supply and other gas, oil, acid and other pipelines, as the regulation and throttling device. In addition to being used as a large-scale pressure swing adsorption (PSA) gas separation device program control valve, the metal-to-metal face seal triple eccentric butterfly valve can also be widely used in the fields of petroleum, petrochemical, chemical industry, metallurgy and electric power, and the gate valve and the stop valve are good replacement product.
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