An electronic loop controller outputs a signal of 14 mA to a linear responding control valve (where 4 mA is shut and 20 mA is wide open) as shown in the Figure. Control valve Controller 14 mA Valve position 72 SI. No 1 2 Flow Rate (L/min) 0 20 40 60 80 Valve opening (%) 0 25 50 75 100 3 4 5 Explain the working principle of the pneumatic valve for the applied signal of 4-20 mA and determine the flow rate when the applied signal is 14 mA