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Selection of chemical valves


1. Clarify the purpose of the valve in the equipment or device
Determine the working conditions of the valve: the nature of the applicable medium, working pressure, working temperature and manipulation control methods, etc.

2. Correctly choose the type of valve
The correct choice of valve type is based on the designer's full grasp of the entire production process and operating conditions. When choosing a valve type, the designer should first grasp the structural characteristics and performance of each valve.

3. Determine the end connection of the valve
Among threaded connections, flanged connections, and welded end connections, the first two are the most commonly used. Threaded valves are mainly valves with a nominal diameter below 50mm. If the diameter is too large, it will be very difficult to install and seal the connection.

Flange-connected valves are more convenient to install and disassemble, but they are bulkier and more expensive than threaded-connected valves, so they are suitable for pipe connections of various diameters and pressures.

Welded connections are suitable for heavier conditions and are more reliable than flanged connections. However, it is difficult to disassemble and reinstall the valve connected by welding, so its use is limited to the occasions that can usually operate reliably for a long time, or use severe conditions and high temperature.

4. Selection of valve material
When selecting the material of the shell, internal parts and sealing surface of the valve, in addition to considering the physical properties (temperature, pressure) and chemical properties (corrosiveness) of the working medium, the cleanliness of the medium (whether there are solid particles or not) should also be mastered. In addition, refer to the relevant regulations of the country and the user department.

Correct and reasonable selection of valve material can obtain the most economical service life and best performance of the valve. The selection order of the valve body material is: cast iron-carbon steel-stainless steel, and the selection order of the sealing ring material is: rubber-copper-alloy steel-F4.

5. Others
In addition, the flow rate and pressure level of the fluid flowing through the valve should also be determined, and the appropriate valve should be selected by using existing information (such as valve product catalogs, valve product samples, etc.).
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