1. The valve model number should specify the applicable national standard number. If it is a company standard, relevant specifications for the model number should be provided.
2. The valve's working pressure should be ≥ the pipeline's working pressure. Without affecting the price, the valve's operating pressure should be greater than the actual operating pressure of the pipeline.
3. The valve's manufacturing standard should specify the applicable national standard number. If it is a company standard, the company's documentation should be attached to the purchase contract.
