Thanks, Martin. I knew something was off.
When the valve is mostly closed and the bag is not tight, I was showing 20 inches of mercury. (See attached pic).
When the valve is mostly open, and the pump sucks the bag tight, I was showing 8 inches of mercury (the original picture).
None of this makes sense to me. The more I open the valve and the tighter the bag is sucked tight, the mercury should go up, not vise-versa correct? It seems to be doing the exact opposite for me...
|