Selection of control valve

Oct 12,2021

Requirements for control travel time: The selected control valve actuator should be able to meet the requirements of the valve travel and process for the level of leakage. In some occasions, if the pressure control valve (including the vent valve) is selected, the actual possible pressure difference should be considered for appropriate amplification, that is, the actuator is required to provide a larger force. Otherwise, when there is an abnormal situation in the process, the actual pressure difference before and after the control valve is relatively large, which may cause the danger of not being able to close or open.
A. Importance of control valve selection
control valve is an actuator in an automatic control system, and its application quality directly reflects the system's adjustment quality. As a terminal component in process control, people have a new understanding of its importance than in the past. In addition to the quality of the product itself and whether the user correctly installs, uses, and maintains the application of the control valve, correct calculation and selection are important. Due to errors in calculation and selection, the system starts and stops, and some even cannot be put into use. Therefore, users and system designers should understand the importance of valves on site and pay enough attention to the selection of regulating valves.
B. Principles of control valve selection
1. According to the process conditions, select the appropriate structure and material.
2. According to the characteristics of the process object, select the flow characteristics of the control valve.
3. According to the process operating parameters, select the appropriate control valve diameter size.
4. According to the requirements of the process, select the required auxiliary devices.
5. Reasonably choose the implementing agency. The response speed of the actuator should be able to meet the process

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