Keeping output air pressure constant.

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Discussion Overview

The discussion revolves around maintaining a constant output air pressure of 1 psi from a variable source pressure ranging from 125 to 175 psi. Participants explore potential solutions and challenges related to pressure regulation in an automotive context.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • Victor reports that his air pressure regulator is unable to maintain a constant output of 1 psi, experiencing fluctuations of +/- 2 psi with changes in source pressure.
  • Some participants suggest that the issue may be due to a high flow rate or a defective regulator, proposing that a two-stage regulator might be necessary given the high input pressure.
  • Another participant mentions finding a different regulator, the Fisher Controls 912N, which reportedly performs better in maintaining constant pressure.
  • One suggestion includes adding a reservoir (air tank) to the system to act as a damper, potentially stabilizing the output pressure.

Areas of Agreement / Disagreement

Participants express differing views on the cause of the pressure fluctuations and the effectiveness of various solutions, indicating that the discussion remains unresolved with multiple competing approaches suggested.

Contextual Notes

The discussion does not clarify the specific flow rates involved or the exact characteristics of the regulators mentioned, leaving some assumptions unaddressed.

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

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