General requirements for pneumatic check valves:
1. The specifications and categories of pneumatic valves produced should comply with the requirements of the pipeline design documents.
2. The model of the pneumatic valve should indicate the national standard number requirements it is based on. If it is an enterprise standard, the relevant description of the model should be indicated.
3. The working pressure of pneumatic valves should be ≥ the working pressure of the pipeline. Without affecting the price, the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline; Either side of the pneumatic valve should be able to withstand 1.1 times the valve working pressure without leakage when it is closed; When the valve is open, the valve body should be able to withstand twice the working pressure of the valve.
4. The manufacturing standards for pneumatic valves should specify the national standard number they are based on. If it is an enterprise standard, the procurement contract should be accompanied by the enterprise document.