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Old 23 January 2014, 02:40 PM
jimmy101_again jimmy101_again is offline
Join Date: 29 December 2005
Location: Greenwood, IN
Posts: 6,912

Originally Posted by GenYus234 View Post
I believe that the force required to seal a compression fitting is about compressing the (brass, copper?) ferrule. BoKu is (I think) talking about fighting the pressure of the gas as the fill hose is sometimes just held on the tire stem.
Actually no. For a quick release fitting the pressure you have to apply is proportional to the line's air pressure and the cross sectional area of the seal in the fitting. The cross sectional area though is pretty small, I would WAG it at 1/4" diameter which gives an area of about 0.05in^2 and a force of ~6 pounds at 120 PSIG. The math is similar for a typical tire filling adapter so there should be relatively little force needed to hold it in place even at high pressures.
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