[WhiteTyrus]

I was pressure testing my recovery tank at 140 PSI and my partner tapped around the PRV which is supposed to go off at 150 PSI and it blew, it stopped at 90 PSI he tapped around it again and it blew again this time down to 60 PSI. I'm curious as to whether or not because there possibly could have been water created from the air compressor that caused the PRV not to close due to Waters incompressability?

[Gray Wolf]

Originally Posted by WhiteTyrus

I was pressure testing my recovery tank at 140 PSI and my partner tapped around the PRV which is supposed to go off at 150 PSI and it blew, it stopped at 90 PSI he tapped around it again and it blew again this time down to 60 PSI. I'm curious as to whether or not because there possibly could have been water created from the air compressor that caused the PRV not to close due to Waters incompressability?

Pressure relief valves reseat at a lower pressure than they crack. The manufacture should be able to supply crack and reseat pressures.

Cheeep PRV's are not reliable as to either pressure and can begin to open at lower and lower temperature as the springs weaken.

May I suggest that you replace the PRV with something like a Swagelok with certified operating parameters.

[WhiteTyrus]

Originally Posted by Gray Wolf

Pressure relief valves reseat at a lower pressure than they crack. The manufacture should be able to supply crack and reseat pressures.

Cheeep PRV's are not reliable as to either pressure and can begin to open at lower and lower temperature as the springs weaken.

May I suggest that you replace the PRV with something like a Swagelok with certified operating parameters.

Thank you GW, this Stainless PRV's was about $100 so I thought I bought something good I'll have to check out the Swagelok

[HWY36]

Originally Posted by WhiteTyrus

I was pressure testing my recovery tank at 140 PSI and my partner tapped around the PRV which is supposed to go off at 150 PSI and it blew, it stopped at 90 PSI he tapped around it again and it blew again this time down to 60 PSI. I'm curious as to whether or not because there possibly could have been water created from the air compressor that caused the PRV not to close due to Waters incompressability?

I'm guessing it if it went off at 140 psi instead of the 150 psi that it was supposed to, it was close enough to the blow off point to be on a hair trigger. Perhaps your friend tapping around it was all the help it needed to push it over the edge; I had the exact same thing happen not long ago. Not sure why it would go off again at 90 psi though.