how pressure reduce through pressure control valve? suppose we have to reduce 2

how pressure reduce through pressure control valve? suppose
we have to reduce 20 kg pressure to 10 kg pressure , then
what we do ? open the valve or close the valve , initially
it is 20 % is upon ( for ur knowledge ).

Question Posted / priyanka

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how pressure reduce through pressure control valve? suppose we have to reduce 20 kg pressure to 10 ..

Answer / senthil r.m

My dear,
In control valve we ll compare the setpoint(operator interference value) and the actual pressure on the line.this deviation is given to the control valve.When the error is positive(means pressure is high),the C/V starts closing and when the error is negative(means pressure is low),the C/V opens and maintains the pressure.
One more thing,why u need to fix the low limit of control valve to open 20%.Depending on the deviation the controller controls the process pressure.
Finally,the controller tuning is must for this control.play with the gain and integral time and deadband to make steady process..

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0 No

how pressure reduce through pressure control valve? suppose we have to reduce 20 kg pressure to 10 ..

Answer / daxish_02

If pipe size is same before and after so this answer is correct..
basic fundamental behind the general formula that is
pressure=force/area......ok
here pipe size is fixed...ok
assume 20% valve open....than area of pipe cover after the valve is more so we get some pressure..
assume that valve open 40% so area of material flowing through valve increase so pressure decrease after the valve.....

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1 No

how pressure reduce through pressure control valve? suppose we have to reduce 20 kg pressure to 10 ..

Answer / ashraf

First, know where the valve is.If it is at upstream,(High
pressure line to vessel), then close valve and open vent
valve till pressure reduces to 10 kg. If it is at
Downstream,open the valve.

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1 Yes

1 No

how pressure reduce through pressure control valve? suppose we have to reduce 20 kg pressure to 10 ..

Answer / g.s.arun

to open the byepass valve ,to reduce the pressure 20kg to 10 kg.

Is This Answer Correct ?

1 Yes

4 No

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