Procedure and basis for valve selection

Select step

1. Define the purpose of the valve in the equipment or device, determine the working conditions of the valve: applicable medium, working pressure, working temperature, etc.
2. Determine the nominal size and connection mode of the pipe connected to the valve: flange, thread, welding, etc.
3. Determine the way to operate the valve: manual, electric, pneumatic or hydraulic, electropneumatic linkage, etc.
4. Select the type of valve: closed-circuit valve, regulating valve, safety valve, etc.
5. Determine the type of valve: gate valve, globe valve, ball valve, butterfly valve, throttle valve, safety valve, pressure reducing valve, steam trap, etc
6. Determine the selected valve shell and inner parts of the material according to the medium, working pressure, working temperature in the pipeline transmission: ductile iron, gray cast iron, malleable cast iron, carbon steel, alloy steel, stainless acid steel, copper alloy, etc..
7. Determine valve parameters.

Basis for valve selection

1. The use, working condition and operation mode of the selected valve.
2. The properties of the working medium: working pressure, temperature, corrosion performance.
3. Requirements for valve fluid characteristics: flow resistance, discharge capacity, sealing grade, etc.
4. Installation dimension and external dimension requirements: nominal size, connection mode and connection dimension with pipe, external dimension or weight limit, etc.
5. Additional requirements for reliability, service life of valve products and explosion-proof performance of electric devices.