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[ pdf ] CONTROL VALVE SELECTION AND SIZING ENGINEERING DESIGN GUIDELINES

CONTROL VALVE SELECTION AND SIZING ENGINEERING DESIGN GUIDELINES Download
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Topic under  Control Valve
Source: www.kemco.or.kr 
File size: 0.95 KB
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Last download on: Sun Sep 24, 2017 05:27:33 AM
Short Desciption:
The control valve is the most common type of final control element in a process control system. The final control element is the mechanism which alters the value of the manipulated variable in response to the output signal of an automatic controller, a manually manipulated control device, or direct manual manipulation. The operation of a control valve can be pneumatic or electrical. Many process engineers face issues to correctly select and size a control valve. Control valves have different flow characteristics and the valve selection is largely based upon the type of application or process where the valve is going to be installed. An oversized valve will introduce extra cost and have difficulties in controlling the flow at low rates whereas an undersized valve might not be able to handle the maximum capacity of the process flow.

Summary:
There are many available guidelines developed to aid engineers in selecting and sizing the valves, but these guidelines are often developed by certain companies and might only be suitable for the application of the valves provided by their own companies. The objective of this guideline is to provide the fundamental knowledge associated with control valves and a step by step guideline which is applicable to properly size control valves in a correct manner. Generally, a control valve consists of two parts: (1) an actuator which translates the output signal of the controlling device into an action involving a large force or the manipulation of large power and (2) a device responsive to the actuator force which adjusts the value of the manipulated variable. The geometry of the valve body and the material of construction will ultimately determine the valve’s characteristics. Flow properties of valve will be determined by the combined geometry of the body and plug. Common control valves are operated by a linear position actuator or some modification of such an actuator. These actuators position the valve plug in the orifice in response to a signal from the automatic controller or through a manual mechanical adjustment.
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