28

2020

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05

Basis for selecting valves

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1. The purpose, operating conditions and operation control method 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 a flammable or explosive medium, the viscosity of the medium, etc. 3. Requirements for valve fluid characteristics: flow resistance, discharge capacity, flow characteristics, sealing grade, etc. 4. Installation dimensions and overall dimension requirements: nominal diameter, connection method and connection size to the pipeline, overall dimensions or weight limit, etc. 5. Additional requirements for the reliability, service life of valve products and the explosion-proof performance of electric devices.

While understanding the steps for selecting valves, you should also further understand the basis for selecting valves.

1. The purpose, operating conditions and operation control method 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 a flammable or explosive medium, the viscosity of the medium, etc.

3. Requirements for valve fluid characteristics: flow resistance, discharge capacity, flow characteristics, sealing grade, etc.

4. Installation dimensions and overall dimension requirements: nominal diameter, connection method and connection size to the pipeline, overall dimensions or weight limit, etc.

5. Additional requirements for the reliability, service life of valve products and the explosion-proof performance of electric devices.

 

Pay attention to the following when selecting parameters:

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

According to the above-mentioned basis and steps for selecting valves, when selecting valves reasonably and correctly, you must also have a detailed understanding of the internal structures of various types of valves so that you can make the right choice for the preferred valve.

The final control of a pipeline is the valve. The valve opening and closing parts control the flow pattern of the medium in the pipeline. The shape of the valve flow channel gives the valve certain flow characteristics. This must be taken into consideration when selecting the most suitable valve for installation in the pipeline system.