A bypass valve actuator having exhaust system

The utility model provides a bypass valve actuator with an exhaust system. The device comprises a shell, a diaphragm, a linkage rod assembly, a spring and a spring seat, the shell is provided with anair inlet pipe and a linkage rod passing hole. wherein the diaphragm is arranged in the shell; an inner cavity of the shell is divided into a pressure cavity and a driven cavity; the air inlet pipe iscommunicated with the pressure cavity; the linkage rod is communicated with the driven cavity through the hole; one end of the linkage rod assembly is arranged in the driven cavity; the spring is sleeved on a rod body of the linkage rod, one end of the spring is contacted with the inner wall of an end cap of the linkage rod, the other end of the spring is arranged on a spring seat, pressure is exerted on the shell body through the spring seat, and an auxiliary exhaust hole is formed in the side wall of the driven cavity. According to the bypass valve actuator provided by the utility model, the communication mode of th