Keeping output air pressure constant.

[xxrusianxx]

Hello everyone, I am new here and just wanted to take this time to say hi. My name is Victor I am an automotive technician from Boston MA,
I'm really glad I came across this Forum it has deffinetly peaked my interest. With that being said... I do have a question.

I am working on a project which requries 1 psi air pressure. My air source is 125 to 175 psi. So far I have obtained a 0-5 psi air pressure regulator (Dwyer MPR2-0) and can succsessfully set it to 1 psi. However, when my source pressure drops or raises it has a significant effect on my output pressure (+/- 2 psi). Question being, how can I keep my output pressure constant at 1 psi with a variable source pressure?

 

[Dr_Morbius]

Hmm. That's odd. The output pressure should remain constant as long as the input is greater than the set point. Only thing I can think of is that your flow rate is too high or your regulator is defective. You might also need to use a 2 stage regulator since the source pressure is so much higher than your output.

 

[xxrusianxx]

After doing some research I found a different regulator that does a better job at keeping constant pressure.
Fisher Controls 912N

 

[Jobrag]

If you don't have one already try putting a resevoir (air tank) on the 1 PSI part of your system to act as a damper.