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 Farný http://dalibor.farny.cz sent from Samsung Galaxy Pad Dne 2.11.2012 18:39 "jb-electronics" <[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 > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msg/neonixie-l/-/97AX8xIzEIkJ. > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
