WHAT IS THE Differance b/w on/off & pid control valve?
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Answer Posted / ytd
ON/OFF CONTROL VALVE WORKING IN TWO MODE EITHER ON OR OFF.
In ON off control process has shoot up and down. This
process is not suitable for critical processes.
E.G.controlled heating / cooling for Annealing cycle.
PID control generally used in close loop process where
feedback of output is used to correct the input depend upon
the desired process.
S(o/p)= S(i/p)+/-(S(correction).
From this simple equation o/p signal is corrected but
depending upon the responce of the process `Diffential
gain' or integral gain is introduced and this simple
equation is modified.
Depending upon the process performance responce time ang
gain values are to be programmed in the PID controller.
Then PID controller follows the equation to make process
more controlled.
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