vacuum pump problems.

vacpurge

New Member
soo.

ive had some oil in the chamber for about 5 days straight now. under full vacuum. I went to check it out and maybe try pulling on it a bit more because of the degassing. I always turn the pump on FIRST and THEN open the ball valve up. this time I did and the gauge dropped right down to like 19"... that was as much as the pump could handle!!!

soo. is my 109$ pump all of a sudden worn out? or could it be the oil, which I recently changed....?

weird, I worked fine 5 days ago, did nothing but sit outside in the nice temp, now it wont pull a decent vacuum.. wtf????
 

vacpurge

New Member
crazy. the first oil I used worked for months! like 50 pulls!!! this stuff is 1 month and maybe 15 pulls! ill change and let ya know. thanks.
 

vacpurge

New Member
well.. im an idiot.


in order to stop the chamber from somehow pulling oil back into the chamber through the ball valve, I usually unhook the line from the vacuum pump!!! I forgot it was unscrewed all the way on and just sitting there.. im surprised I was even able to pull a 19" vacuum!

so, here another question. all my fittings are threaded, simple. 1/4" I believe. could I get a 1/4" threaded check valve, or another ball valve so that I got two of them to stop the chamber from pulling my pump oil back into the line? it somehow gets my vacuum pump oil to sit on the CLOSED ball valve... so when I open the ball valve, a few drops of oil drip into the chamber. wtf??? is my ball valve not holding? the vacuum level seems fine..
 

Fadedawg

Well-Known Member
well.. im an idiot.


in order to stop the chamber from somehow pulling oil back into the chamber through the ball valve, I usually unhook the line from the vacuum pump!!! I forgot it was unscrewed all the way on and just sitting there.. im surprised I was even able to pull a 19" vacuum!

so, here another question. all my fittings are threaded, simple. 1/4" I believe. could I get a 1/4" threaded check valve, or another ball valve so that I got two of them to stop the chamber from pulling my pump oil back into the line? it somehow gets my vacuum pump oil to sit on the CLOSED ball valve... so when I open the ball valve, a few drops of oil drip into the chamber. wtf??? is my ball valve not holding? the vacuum level seems fine..
The line from the pump to the valve is under vacuum when you shut it off and will pull some oil from the pump. If that is a problem, you can shut the valve and disconnect the line before shutting off the pump, or put the valve closer to the pump.
 

vacpurge

New Member
ah! that makes sense, I never thought of after the valve still being under vacuum.

so even if I jut unscrewed it from the pump real quick, then screwed it back on would get rid of the vacuum so its ready to use for next time?
 

Guzias1

Well-Known Member
ah! that makes sense, I never thought of after the valve still being under vacuum.

so even if I jut unscrewed it from the pump real quick, then screwed it back on would get rid of the vacuum so its ready to use for next time?

yup, you are closing off the chamber right at your lid, anything between that and your pump is under vac, unless released (IE. remove hose from vac)

i would only do so on long purges. initial quick purges usually dont need this if you are closing off the chamber correctly..
 

Fadedawg

Well-Known Member
ah! that makes sense, I never thought of after the valve still being under vacuum.

so even if I jut unscrewed it from the pump real quick, then screwed it back on would get rid of the vacuum so its ready to use for next time?
Correct, if you close the valve and then unhook the hose before shutting off, you won't be aspirating any oil from the pump.

You can also install a valve closer to the pump, so that the vacuum reservoir (plenum) produced by the hose is smaller.
 
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