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Nitrogen regulator

pinch on Wed August 03, 2011 3:30 PM User is offlineView users profile

I have just bought a Uniweld RHP400 Nitrogen regulator for leak testing.
In the manual it states that turning the handle counter-clockwise until the handle is loose it will depressurise the regulator.
I can turn it till it falls off and still there is the same pressure in regulator and hose...how do you depressurise it ?
Anyone knows ?
Also I tried it on a Chevy Tahoe which leaks about 7 ounces of refrigerant per week, I have found the leak with dye(it was the pipes for the rear unit) but wanted to test the nitrogen equipment with a vehicle I know leaks to see how much it shows on the gauge.
Problem is I left it with 200psi pressure for 3 hours and it holds the same pressure...and yes, I closed the nitrogen bottle valve !
I expected to see some major pressure drop with that kind of leak.


Edited: Wed August 03, 2011 at 3:35 PM by pinch

Dougflas on Wed August 03, 2011 3:54 PM User is offline

the depressurize you turn handle counter clockwise until there is no tension on handle and then bleed hose. The gauge will then decrease its reading.

pinch on Sat August 06, 2011 2:33 AM User is offlineView users profile

Ok, I thought there was a reliefvalve that let the pressure out when they said depressurise.
But now I know, thanks.

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