1. The sealing performance of the valve should meet the requirements of medium.
2. Choose the correct type of valve. First of all, understand the structure and performance of each valve.The type of general valve is selected as cupreous sealing globe valve for medium and low pressure steam, and the steam gate valve for 8’’ and above.Butterfly valve is used on circulating water main, and rubber gate valve is used on branch pipe.Butterfly valve for low pressure air main, globe valve for branch pipe;Ball valves for common liquid materials.
3. Determine the end connection of the valve. The first two types are most commonly used in the threaded connection and flanged end connection, among which the threaded connection is much lower than the flange connection. Generally, it is a smaller size valve, which should be selected first.
4. Selection of material of main parts of valve.First of all, the physical and chemical performance of the valve should be considered.Know the cleanliness of the medium. The first two types are most commonly used in the threaded connection and flanged end connection, among which the threaded connection is much lower than the flange connection. Generally, it is a smaller size valve, which should be selected first.
5. Determine the flow rate through the valve.
6. The pressure level shall be selected in the order from low to high.
