Empty sylphon seal self -operated pressure control valve of fidelity

The utility model discloses an empty sylphon seal self -operated pressure control valve of fidelity, which comprises the following components: a valve body, the threaded connection disk seat is passed through to the valve body lower part, connect the case on the disk seat, the case outside is equipped with the valve gap, the valve gap passes through threaded connection pressure adjustment dish, be equipped with the stroke pad with the case junction in the valve gap, valve gap upper portion is equipped with the packing box, the case is equipped with the spring holder in gland upper portion position, be fixed with the pretension spring between spring holder and the pressure adjustment dish, case upper end ejector tie rod, the push rod welds with last bellows part lower extreme, threaded connection is carried out with the tray member in the push rod upper end, linking bridge passes through bolt and nut and connects membrane lid down, linking bridge will go up the upper end pretension of bellows part and seal thr