Valve specifications and categories shall conform to the requirements of the pipeline design document:
1. The type of valve should be indicated according to the international number requirements.If the enterprise standard, to indicate the model description.
2. The working pressure of the valve shall 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 shall be greater than the actual working pressure of the pipeline.
3. The valve manufacturing standard shall state the national standard model according to which the valve is manufactured. If the enterprise standard is adopted, the enterprise document shall be attached to the procurement contract.