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The shut-off valve is generally composed of a straight-stroke single-acting piston-type pneumatic actuator and a quick-opening single-seat shut-off mechanism. The valve body is a straight-through single seat structure, and the valve core is a quick-opening soft (or hard) sealing structure. Because of its simple structure, excellent processing, reliable operation, tight and no leakage, it can be quickly opened and closed, convenient to maintain, fireproof, explosion-proof, etc., making it ideal for automatic fast cut-off, automatic conveyance or safe venting in the automatic control system of production process controlling device. It is widely used in the production process control of chemical, petroleum, metallurgy, electric power, light industry, medicine, building materials and other industrial sectors. The air source of the pneumatic shut-off valve requires filtered (purified and dehydrated) compressed air, and the medium flowing through the valve body should be a liquid or gas without solid particles and impurities. Including emergency shut-off valve, pneumatic shut-off valve, gas shut-off valve, etc.