Butterfly valves have a lot of kinds, fast cutting, continuous adjustment, it is mainly used for liquid, gas low pressure, large diameter pipelines, apply to the pressure loss is not big, need to flow control, need to quickly switch, temperature below 300 degrees, usually stress under 40 kg (butterfly valve pressure will not very high, generally like basic CL600), medium is commonly used in water and gas, medium requirements is not high, also can use particle medium,

As a sealed butterfly valve, it obtained the rapid development in the synthetic rubber, so it is a new kind of shut-off valve, until the 1980 s in China, the main effect of low pressure butterfly valve, valve seat adopts the synthetic rubber, in the 1990 s, with the increasing exchanges with foreign, hard seal (metal sealing butterfly valve has been developed rapidly, at present, some manufacturers can produce stable medium pressure valve
Metal sealing butterfly valve, butterfly valve should be in a wide area development, the butterfly valve can be movement and control medium as water, water, circulating water, sewage, sea water, air, gas, natural gas liquids, powder, slurry, pulp and suspended solid mixture of butterfly valve is suitable for the flow control, due to large butterfly valve in the pipeline pressure loss, about three times of gate valve, so when choosing butterfly valve, pressure loss should be considered for the influence of piping system, and considering the disc in closing the safety of the pipeline under medium pressure, in addition, must consider the temperature of the resilient seat materials under high temperature limit, the butterfly valve structure of small length, total height is small, opening and closing speed, and has good flow control characteristics, the most suitable for production of large diameter valve butterfly valve structure principle, when need butterfly valve for flow control, the most important thing is to choose the correct butterfly valve size and type, so it can normal work effectively,

In general, the throttling, adjust and mud medium, demand structure length is short, opening and closing speed (speed 1/4), low pressure by the small (pressure difference), recommend choosing butterfly valve, the two position adjustment, reducing channel, low noise, cavitation, a small amount of leakage to the atmosphere, the abrasive medium, can choose butterfly valve, the throttling, sealed tight, serious wear and tear, low temperature (low temperature), and other special conditions using a butterfly valve, for special triple eccentric or double eccentric butterfly valve, special metal sealing must be used with adjusting device, the metal to metal seal triple eccentric butterfly valve as large transformer program-controlled valve of gas separation device, can be widely used in petroleum, petrochemical, chemical, metallurgy, electricity and other fields, is a gate valve, globe valve good alternatives,