What will happen, if we set a non-return valve after the delivery line of a screw compressor such as ATLAS COPCO- GAe30?

 

it does not break problems that can impair your machine, but it is not advisable to do so, because the tone compressor sensor does not give the exact value in your air network , which affects compressor rest time as well as its regulation

discharge pressure is7.2 bar with a2 inch delivery line and a2 inch NRV.

Tell you how much the line pressure is adjusted to your pressure valve screw?

If you are putting NRV pressure less than discharge pressure of Air from air compressor, than it will Open and let got the air.
But if it has more holding capacity than the air pressure, the result could be uncertain.