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Answer Posted / nanjilll
Characteristics of control valve:
1. Quick opening => Large change in flow for a small change in Valve travel.(eq. 50% opening gives 90% flow).Usually used as on/off valve
2. Linear => change in flow rate is directly proportional to the change in valve travel(40% flow for 40% valve travel)
3. Equal percentage => not linear but logirthemic variation.
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A DP transmitter is used to measure the level of an open tank. The drain line of the tank is connected to a control valve, and is configured as, if the level of the tank is 90% the valve should get open 10%. And if the tank level is 10%, the valve should get open 90%. Draw wiring diagram and explain how to configure DP transmitter and control valve using HART communicator. If the span error at output is 1%, what will be the %opening of the control valve at 60% level of the tank?
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