Answer / pankaj nandasana

As you know....0.2 to 1 kg/cm2 is equal to 3-15 psig..
Generally we are considering this range...reasons are following...

1) Suppose if your have set lower limit at 0 psig, then how you can differentiate zero signal level and pipe breakage..!!!! You can not distinguish two thing..That why we select some elevated range from 0 psig.

2) Our all instrument are producing linear response in the range of 3-15 psig.

3) Pneumatic supply to all instrument is 20 psig..so alway there is bleading of air from instrument..for standardlisation purpose all are considering 3-15 psig..

Answer / ashish namdev, bina refinery [

The diaphragm design of all control valves are universal and
the out of the actuators are 3 to 15 psi.When more than the
15 psi pressure is acting to the diaphragm that will lead it
to faulty so we use the 0.2 to 1.0kg/cm2 for control valves.

Answer / guest

0.2

Answer / s k

because the control valve work within the specified pressure
range of about 0.2 to 1.0 kg/cm2.

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