Patent ID: 7104274
Filing Date: 2006-09-12
Classification: F16K,Y10T

Abstract:
1. Apparatus for regulating air flow into a rim mounted pneumatic vehicle tyre, said apparatus having an elongated valve housing with an inlet end, an outlet end and a central portion, the outlet end including a rim insertion portion configured to fit into an aperture in the tyre rim, a piston disposed within said housing and including a valve member, a coil spring acting in compression between an interior shoulder of said housing and a flange on said piston whereby in use of said apparatus the piston is biased to an open position for passage of air into said tyre and is movable against said bias under force of air pressure build-up in said tyre to a closed position at which the valve member seals against a valve seat to close off said passage of air, said piston and spring being located within said central portion of the housing clear of the rim insertion portion so that said rim insertion portion is of reduced size not obstructive to the mounting of said tyre, a piston position indicating band fitted to said piston and visible through a transparent portion of a cap fitted to said housing, and said cap being turnable down onto a threaded seat to an over-ride position at which said band and piston are held to said over-ride position irrespective of tyre pressure.