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A butterfly valve is a mechanism that regulates the flow of materials within large pipe diameters by the quarter-turn rotation of a disc. 

Air pressure reducing valve, The outlet pressure of the pressure reducing valve is almost equal to the inlet pressure, no decompression.

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Generally, a petrochemical plant has thousands of valves, among which the number of check valves are important pipeline pressure-bearing components in petrochemical plants. chec valves accounts for about 5% of the number of process valves.