Rapid blow-down valve

The utility model relates to a quick blow-down valve which comprises a blow-down valve body, a positioning rod and a rotary disc, a positioning table is arranged at the upper end of the positioning rod, the rotary disc is arranged on the positioning rod in a sleeved mode and forms a linkage structure with the positioning rod, and the lower end face of the rotary disc abuts against the positioning table. A plurality of limiting blocks are arranged on the edge of the lower end of the pressing head in the circumferential direction, through grooves are formed in the positions, corresponding to the limiting blocks, of the rotating disc, and the limiting blocks penetrate through the through grooves and extend out of the lower end face of the rotating disc. The part, extending out of the lower end face of the rotary disc, of the limiting block is connected with the positioning rod through a detachable positioning rod. According to the blow-down valve, the rotating disc can be quickly disassembled and assembled. 本实用新