Importance and principles of control valve selection

1,The importance of control valve selection
Control valve is an actuator in the automatic control system, the quality of its application is directly reflected in the system's regulatory quality. As a process control in the terminal components, people have a newer understanding of its importance than in the past. Regulating valve application of good or bad, in addition to the quality of the product itself, the user whether the correct installation, use, maintenance, correct calculation, selection is very important. Due to calculation and selection errors, resulting in the system on and off, and some even can not be put into use, so for users and system designers should recognize the importance of the regulator valve in the field, the regulator valve selection must be given sufficient attention.

2,The principle of control valve selection

(1)According to the process conditions, select the appropriate structural form and material.
(2)according to the characteristics of the process object, select the flow characteristics of the control valve.
(3) according to process operating parameters, select the appropriate control valve caliber size.
(4) according to the requirements of the process, select the required auxiliary devices.
(5)Reasonable selection of actuators. The response speed of the actuator should be able to meet the process
Requirements for the control of the stroke time: the selected control valve actuator should be able to meet the full range of regulating valve stroke and process requirements for the leakage level. In some occasions, such as the selection of pressure control valves (including venting valves), the actual possible differential pressure should be considered for appropriate amplification, that is, the actuator is required to provide a larger force. Otherwise, may be when the process of abnormal conditions, the actual pressure difference between the front and rear of the control valve is large, will not be able to close or open the danger.

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