Quote: (Originally Posted by RonMicjan)
when doing a neg check, I pull a good vac and close the DSV. then make sure the loop is hanging with the hoses a bit scrunched up and watch for gravity to pull the DSV earthward (unit is standing up) If the DSV does not begin to droop then the neg is good and I immediatly release it.
Hi Ron,
I'll second that. Except I move stuff/hoses around just to see if it still holds the vaccum in all positions. I caught some weak o-rings like that, some partially un-screwed IP hose fittings, Swagelok fittings forgotten to be crancked tight...
Best
Philippe