Quick-closing type air extraction check valve

A quick-closing type air extraction check valve comprises a valve body. A valve clack is arranged in the valve body, the side surface of the valve clack is connected with a rocker arm through a locking nut, the upper end of the rocker arm is fixedly installed on the outer surface of a valve rod through a shaft key, and the two ends of the valve rod are movably connected in shaft holes in the two ends of the valve body. A pneumatic actuating mechanism is fixedly installed on one side of the valve body through a detachable support, and comprises a driving shaft and an air cylinder, one end of the driving shaft is in transmission connection with the air cylinder, the other end of the driving shaft is in coaxial transmission connection with one end of the valve rod, and the outer surface of the driving shaft is hermetically connected with the valve body through packing. The quick-closing type air extraction check valve overcomes defects in the prior art; the driving shaft and the valve rodare connected through a