Novel valve sleeve type blow-down valve for natural gas station

The novel valve sleeve type blow-down valve of the natural gas station comprises a valve element and a valve element sleeve, a valve rod is arranged at one end of the valve element, a pressure relief shaft is arranged at the other end of the valve element, the pressure relief shaft comprises a flow guide section and a cylindrical section which are sequentially connected, and the diameter of the flow guide section is gradually increased towards the direction of the cylindrical section; the end, away from the flow guide section, of the cylindrical section extends into one end of the valve element sleeve and is connected with the other end of the valve element. The diameter of the cylindrical section is the same as the maximum diameter of the flow guide section; a sealing gasket is arranged at the other end of the valve element and used for covering the area between one end of the cylindrical section and the inner side of one end of the valve element sleeve. By the adoption of the scheme, the diameter and area o