Senior Member
Join Date: Feb 2006
Location: Sin City, Nevada
Posts: 2,886
Bikes: Catrike 700, Greenspeed GTO trike, , Linear LWB recumbent, Haluzak Horizon SWB recumbent, Balance 450 MTB, Cannondale SM800 Beast of the East
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Presta or Schrader valve? At least one reply here only applies to presta valves and that is tightening the nut too much.
My experience is that you would break off the top of the valve if you tightened the closure nut too much and you would see that right away. I've never lost a valve tightening the nut that may be there to fix the position of the valve in the rim hole.
You might have pinched to tube between the rim and tire when you mounted the new tire. That sometimes causes the tire to lift off and you shred the tube at that point. I agree the best way is to remove the tube and inflate it outside of the tire. I have a narrow 700C tire on my trike. It only requires topping off about every 10 days to avoid pinch flats. If it goes down any sooner than that I know I have a puncture.