Hi Dalibor,
yes, the oild does not just simply get sucked back, there is a
protection. I actually tried what you said about three hours ago, and as
it turns out, it also leaks with no ball valve and the pump turned off.
But I should mention that there is almost no vacuum grease on some
connections. Will re-grease them in a couple of days (when the grease
gets here) and try again then. In the meantime, I will keep my eyes open
for a different valve.
I will also mount the Pirani and nothing else tomorrow and see if I get
the same results.
Jens
Does your pump have a system what prevents the oil to be sucked back
into vacuum aparature when turned off? If so, you can try removing the
valve and measure the vacuum after turning the pump off.. it should
hold the vacuum.
And did You try to unmount all the branches from your aparature except
the pirani one? This would eliminate possible leaks on other parts of
system..
Dalibor Farnı
http://dalibor.farny.cz
sent from Samsung Galaxy Pad
Dne 2.11.2012 18:39 "jb-electronics" <[email protected]
<mailto:[email protected]>> napsal(a):
Hello Ron,
I will keep looking for a more suitable valve, but in the meantime
I will try to fix it with some grease to see if that changes anything.
Do you have a recommendation for some valves with flanges?
Jens
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!
ron
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