Every process plant is made of several thousands of control loops, which are networked together to form a network. A control loop is designed to control the process variables such as flow, pressure, level, and temperature in a required range. Each of these loops are subjected to certain internal disturbances. These disturbances may affect the process variable. When a disturbed loop interacts with other loops, the result is often disastrous. Hence, various types of are used to collect the information on the process variables at a desired set point. The information collected by these devices are processed by the controller. It decides how to get the process variable back to its desired position after a disturbance. Once all the measurement, comparison, and the calculation is done, a final control element implements the action decided by the controller. The control valve is most often the final control element of the process industries.
In short, the control valve regularizes the flow of gas, water, steam, and chemical compounds, to compensate for the disturbance of the load. It helps keep the process variable close to the desired point.
Generally, the globe valves are used as the control valves. The ends of these valves are flanged, which aids in easy maintenance.
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