1. The model of the valve shall indicate the national standard number requirements. If it is an enterprise standard, the relevant description of the model should be indicated.
2. The working pressure of the valve is required to be greater than or equal to the working pressure of the pipeline. On the premise of not affecting the price, the working pressure that the valve can bear should be greater than the actual working pressure of the pipeline.
3. The valve manufacturing standard shall state the national standard number. If it is an enterprise standard, the enterprise document shall be attached to the purchase contract.
