1. The valve model should indicate the national standard number based on which it is based. If it is a company standard, the relevant model information should be included.
2. The valve operating pressure must be ≥ the pipeline operating pressure. Without affecting the price, the valve's operating pressure should be greater than the actual pipeline operating pressure.
3. The valve manufacturing standard should indicate the national standard number based on which it is based. If it is a company standard, company documents should be attached to the purchase contract.
