Pneumatic butterfly valve is the basic knowledge to pay attention to when purchasing
1. The specification and category of pneumatic butterfly valve shall meet the requirements of pipeline design documents.
2. The type of pneumatic butterfly valve shall be marked with the preparation requirements of national standards. In case of enterprise standard, relevant description of the type shall be indicated.
3. The working pressure of the pneumatic butterfly valve requires the working pressure of the pipeline. On the premise of not affecting the price, the working pressure that the pneumatic butterfly valve can bear shall be greater than the actual working pressure of the pipeline; Any side of the pneumatic valve shall be able to withstand 1.1 times when it is closed. The working pressure value of the pneumatic butterfly valve will not leak; When the pneumatic butterfly valve is opened, the valve body shall be able to withstand 1.5 times the working pressure of the pneumatic valve.
4. The manufacturing standards of pneumatic valves shall be based on national standards. If it is a company standard, the purchase contract shall include company documents.
