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Pneumatic discharge valve is a valve controlled by a pneumatic actuator, mainly composed of valve body, valve disc, sealing ring, valve stem, bracket, valve gland, handwheel, flange, nut, positioning screw and other parts. Easy to operate, open freely, and move flexibly and reliably; The valve disc assembly and maintenance are simple, the sealing structure is reasonable, and the replacement of the sealing ring is convenient and practical.