Multi stage decompression relief pressure valve

The utility model discloses a multi stage decompression relief pressure valve mainly includes the valve body, the valve gap is connected to the valve body upper end and the locking lid is connected tothe lower extreme, be equipped with the cavity in the valve body, valve body one side is equipped with the air inlet of being connected with the cavity, the opposite side of valve body is equipped with the gas outlet of being connected with the cavity, be equipped with the step -down structure in the valve body, the diaphragm is located to be equipped with with valve cover connection in the valvebody upper end, still be equipped with the packing ring between diaphragm and the valve gap, be equipped with the installing support on the valve gap, be equipped with U type mounting hole on the installing support. The utility model has the advantages of simple structure and reasonable design, have the accurate advantage that steps down of high accuracy, the stable performance is reliable. 本实用新型公开了种多级降压减压阀，主要包括阀体，所述阀体上端连