Key points of valve selection

Update:28 Aug 2020

1. Correctly select 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 as a prerequisite. When selecting the valve type, the designer should first grasp the structural characteristics and performance of each valve.

2. Clarify the purpose of the valve in the equipment or device

Determine the working conditions of the valve: the nature of the applicable medium, the working pressure, the working temperature, and the operation control method.

3. Selection of valve material

When selecting the material of the valve housing, internal parts and sealing surface, in addition to considering the physical properties (temperature, pressure) and chemical properties (corrosiveness) of the working medium, the cleanliness of the medium (with or without solid particles) should also be grasped. In addition, refer to the relevant regulations of the country and the user department.

The correct and reasonable selection of valve material can obtain economical service life and good performance of the valve.

4. Determine the end connection of the valve

In threaded connection, flange connection, and welding end connection, the first two are 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 easier to install and disassemble, but they are heavier and more expensive than screw-connected valves, so they are suitable for pipe connections of various diameters and pressures.

Welding connection is suitable for heavy load conditions and is more reliable than flange connection. 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 where the use conditions are heavy and the temperature is high.

5. Other

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

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