close to a disc disc, the valve body around a fixed axis rotation to open, close and regulating fluid called butterfly valve. Butterfly valve is the recent development of the fastest valves varieties, has simple structure, small volume, light weight, material consumption province, installation size small, quick, 90 switch & deg; Reciprocating rotation, low driving torque, etc. For truncation, connected, regulate medium in pipe has good flow control characteristics and close the sealing performance. Butterfly plate the streamline design, make the fluid resistance small, is a kind of energy-saving products.

metal sealing butterfly valve has been developing rapidly, with high temperature resistant, good low temperature resistance, strong corrosion resistance, high strength alloy material in the application of butterfly valve, make the metal sealing butterfly valve under high temperature, low temperature, strong erosion has been widely used, such as operating conditions and parts replaced the globe valve and gate valve.

the purpose of the butterfly valve butterfly Industrial Valves can be used in the cutting medium, can also be used to adjust flow. More used in the low voltage and medium and large diameter of the valve. At present domestic butterfly Industrial Valves parameters are as follows: nominal pressure & le; PN63； Nominal size (~ 4800; Working temperature t≤ 600℃。

butterfly valve size has more than DN10000 abroad. Seal materials commonly used rubber, plastics, but the use of low working temperature; If use a metal or other high temperature resistant material sealing ring, can be used in high temperature.

as a result of the butterfly valve plate movement with polished, so most of the butterfly valve can be used in the medium with suspended solids, based on the strength of the seal can also be used for powder and granular media, the need to pay attention, multi-layer metal hard seal butterfly Industrial Valves is not applicable to this condition, this is because once a particles into nonmetal interlining, will affect the sealing performance, and even be ruined.

the structure of the butterfly valve length and smaller overall height, opening and closing speed, when fully open, with a small fluid resistance, when open to about 15 & deg; ~70° Sensitive, and can carry on flow control, the structure principle of butterfly valve is best suited for production of large diameter valves.