1. The valve model should indicate the basis of the national standard number requirements. If the enterprise standard, should indicate the relevant description of the model.
2. The working pressure of the valve shall be greater than the working pressure of the pipeline. Under the premise of not affecting the price, the working pressure of the valve shall be greater than the actual working pressure of the pipeline. Any side of the valve in closed condition shall be able to withstand 1.1 times the valve working pressure without leakage; When the valve is open, the valve body should be able to withstand twice the pressure of the valve.
3. The valve manufacturing standard, should explain the basis of the national standard number, if the enterprise standard, the procurement contract should be attached to the enterprise document
