RDV rotary disc gate valve The valve plate is driven by the rotating shaft, so that the motion of the valve switch is rotating. The piston rod of the pneumatic actuator does not contact with the medium directly, which prolongs the service life of the actuator. The sealing pair is made of hard metal, ceramics and other wear-resisting materials, which has good mechanical and wear-resisting properties. It solves the problem that the sealing surface is easy to be eroded due to material erosion and has a low life. Therefore, it has a longer service life, can bring ideal use effect and economic benefit to users, and is conducive to equipment maintenance and operation adjustment, so as to make the overall operation safe and economical. Significant improvement.