The role of the valve
The technical parameters of the valve include working pressure, design pressure, working temperature, working medium, sealing form, ambient temperature, etc. If multiple valves are included, the parameter tables of all valves should be listed.
Usually GB/T12225~12230 are used for standardization. First, the materials of the main parts such as the valve cover, valve seat, five-way solenoid valve and valve stem should be standardized. Other materials in contact with the medium should be made of materials whose corrosiveness is equivalent to that of the main material. manufacture. In addition, valve manufacturers generally use non-metallic materials for sealing. Non-metallic materials (pads, gaskets, fillers) should be specified for use conditions, such as corrosion resistance, temperature resistance, and design requirements, and will not cause harmful effects on the medium and other metal materials. All materials are in accordance with relevant national standards.
Valve production requirements
First, the length of the valve structure should generally be determined in accordance with the national standard GB/T12221. If it is an electric valve, the design of the electric device must comply with the standards of the Ministry of Machinery Industry JB/T8528 and GB/T12222. The pressure-bearing parts and important parts of the valve body must undergo non-destructive testing. Generally, the normally closed solenoid valve adopts the JB/T4730 mechanical department standard.
For valves that require a high leak rate, helium gas detection is also required. The pressure test includes shell test, upper sealing test and sealing test, and its test requirements meet the requirements of GB/T13927. The content of the valve body identification and nameplate must comply with the special regulations in the GB/T12220 national standard and specification.