> Hello! > Look carefully at what you described. The ball valve is the culprit, rated for vacuum or not. If the valve is closed, there should be no effect on the pressure if you shut off the pump. Also, as John below says, the packing in those valves is highly suspect. The only packing I have found that will hold a perfect seal is a compressed teflon plug onto mirror polished surfaces. Anything else will dry out and leak. You could try re-lubing it with good vacuum grease, but that will only be a temporary fix. To truly have a leak proof system you will have to change out that valve it looks like. You can find a high vacuum bellows sealed valve on ebay for a lot less than you paid for the needle valve!
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