Basic knowledge of control valves

1, control valve selection

     A, the importance of control valve selection

     Regulating valve is self-control system, actuators, and its application quality direct response to the quality of the adjustment in the system. As a process control terminal components, the importance in it than in the past has been updated knowledge. Control valve applications, good or bad, in addition to the quality of the product itself, the user is installed correctly, use, maintenance, correct calculations, selection is very important. Selection of calculation errors, causing the system to open stop-open, and some can not even put into use, so for users and system designers should be aware of the importance of valves in the field, control valve selection must be taken seriously enough.

     B, the principle of control valve selection

     1, according to process conditions, selection of suitable structural forms and materials.

     2, according to the technical characteristics of the object, select the control valve flow characteristics.

     3, according to process operating parameters, select the appropriate aperture size control valves.

     4, according to process requirements, select the required assistive devices.

     5, selecting the implementing agency. The response speed of the implementing agencies should be able to meet the technical

     To control the travel time requirements: the selected implementing agency should be able to control valves sounded very full schedule and process on the valve leakage volume level requirements. In some cases, such as the selection of pressure control valves (including the venting valves), pressure should be considered possible and practicable, appropriate amplification, which would require implementing agencies to provide a larger force. Otherwise, it may appear abnormal when the process occurs, the actual differential pressure control valve before and after the larger, will occur o ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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