Pneumatic emptying valve with aluminum alloy piston

The utility model discloses a pneumatic discharge valve with an aluminum alloy piston, which relates to the technical field of aluminum alloy pistons and comprises a valve body, an inner hexagonal barrel is mounted at the bottom of the inner wall of the valve body in a threaded manner, a pneumatic component is fixedly mounted at the top of the valve body, and an aluminum alloy column is mounted at the telescopic end of the bottom of the pneumatic component in a threaded manner. An upper clamping groove and a lower clamping groove are sequentially formed in the bottom of the outer wall of the aluminum alloy column body from top to bottom, a plurality of communicating cavities are formed in the lower clamping groove and the upper clamping groove correspondingly, hexagonal sliding columns are slidably installed in the communicating cavities correspondingly, and abutting-out columns are fixedly installed on the surfaces of one sides of the hexagonal sliding columns correspondingly. According to the aluminum alloy