Device for preventing water from entering diaphragm head of pneumatic diaphragm type regulating valve

The utility model belongs to the technical field of oilfield development and production, and particularly relates to a device for preventing water from entering a membrane head of a pneumatic membrane type regulating valve, which comprises a valve body and a membrane cover, and is characterized by further comprising an exhaust pipe, the membrane cover is positioned at the top of the valve body, the exhaust pipe is arranged at the top of the membrane cover, and a membrane, a tray and a spring are arranged in the membrane cover. The lower end face of the diaphragm is connected with the push rod, the upper end face of the diaphragm is connected with the tray, the tray is elastically matched with the upper end face of the diaphragm cover through the spring, the exhaust pipe is of an inverted-U-shaped structure, a dryer is arranged on the exhaust pipe, and a molecular sieve is arranged in the dryer. The service life of the pneumatic actuating mechanism is greatly prolonged, the using performance of the whole valve