1. The model of the valve should indicate the requirements of the national standard number. 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 withstand should be greater than the actual working pressure of the pipeline.
3. The valve manufacturing standard should indicate the national standard number based on it. If it is an enterprise standard, the enterprise document should be attached to the purchase contract.
