Comparison of Control Valves
Control valve plays important role in increasing process profitability , control accuracy & energy saving.
Controlling the valve
A control loop consists of a sensing element, a controller and the final control element the valve and its actuator. The sensing element transmits a signal to a single controller or a distributed control system (DCS).
The controller compares the signal with the setpoint, and then makes any needed corrections by sending a signal to the control valve. The correction is measured and verified by the sensing element, completing the loop. the I/P transducer/electromagnetic/pneumatic changes an signal to control the valve. A control valve should react instantaneously to any change in the signal. To be effective, a valve should: operate over a wide range of flows (have a wide rangeability)accurately respond to any signal across its operating range; exhibit little dead time or hysteresis; react to incremental adjustments from the controller (resolution); and respond with the required speed (stroking speed).
In this view, here sharing the generic comparison for selection of Valves.
Credits - Amit Upadhyay