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Main features and applications: 1 Compact structure, reasonable design, good valve rigidity, smooth passage and small flow resistance coefficient 2 The sealing surface is made of stainless steel and hard alloy, with long service life 3 It is made of flexible graphite packing, reliable sealing, easy and flexible operation 4 The driving mode is divided into dynamic, electric, pneumatic and gear transmission The structural type is elastic wedge single ram, rigid wedge single ram and double ram 5 It is widely used in petrochemical industry, thermal power plant and other oil and water steam pipelines as the opening and closing device to connect or cut off the medium in the pipeline