While understanding and mastering the steps of valve selection, we should also further understand the basis of valve selection.

1. The purpose, working conditions, and operation control mode of the selected valve.
2. The nature of the working medium: working pressure, working temperature, corrosion performance, whether it contains solid particles, whether the medium is toxic, whether it is flammable and explosive, the viscosity of the medium, etc
3. Requirements for valve fluid characteristics: flow resistance, discharge capacity, flow characteristics, sealing grade, etc.
4. Installation dimension and overall dimension requirements: nominal diameter, connection mode and connection size with the pipeline, overall dimension or weight limit, etc.
5. Additional requirements for the reliability and service life of valve products and the explosion-proof performance of electric devices
6. When selecting parameters, pay attention to:
7. If the valve is to be used for control purposes, the following additional parameters must be determined: operation method, maximum and minimum flow requirements, pressure drop in normal flow, pressure drop at closing, and maximum and minimum inlet pressure of the valve.

When selecting parameters, pay attention to:

If the valve is to be used for control purposes, the following additional parameters must be determined: operation method, maximum and minimum flow requirements, pressure drop in normal flow, pressure drop at closing, and maximum and minimum inlet pressure of the valve.