Grease Fitting

Gang,
Quick question - without me having to do much experimentation, does
anyone out there know if a grease fitting is made well enough to hold
air pressure? I have an application in mind, but a normal schrader
valve won't work, but a grease fitting (if silver soldered in
position) probably would be okay.
Thanks.
Ken.
Reply to
Ken Sterling
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Assuming it would, are you willing to risk someone pumping grease into your widget by mistake?
Reply to
Jim Stewart
Grease fittings have a spring loaded ball that seals the hole in the fitting. The heat of silver soldering will anneal the spring and seal will be lost.
Use JB Weld to seal the threads.
JAMW
Reply to
<jamw42
I suspect a normal grease fitting ball check would not be air tight. My Applied Industrial Technology catalog lists leaktight oil fittings which look the same.
Don Young
Reply to
Don Young
Not a grease fitting expert but my little loader / backhoe has 37 fittings and almost every one of them spits some grease back out after I put grease in. My bet would be they won't work for holding air.
Steve.
Reply to
SteveF
Look around for "presta" valves. They're like schrader valves, but a lot skinnier and definitely hold air. As cheap as going to a bike shop and asking for any dead inner tubes with presta valves in 'em. If you do go with a grease fitting, I suspect one made of brass (hard to find, but I've seen 'em before) would have a better chance of actually sealing air. You could also try adding a drop of air tool oil to help it.
Reply to
B.B.
Why would a presta work better than a schrader? The schrader valves are available with 1/8" and 1/4" threads, which makes them very convenient to use, and they hold just as much pressure as the presta.
B.B. wrote:
Reply to
Mike Berger
I did not know a smaller variety of schrader valve was available.
Reply to
B.B.

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