| 摘要 |
There is an apparatus for regulating air flow into a rim mounted pneumatic vehicle tire. The apparatus has an elongated valve housing 1 ' with an inlet end 1 A', an outlet end 2 ' and a central portion between the outlet and inlet. The outlet end includes a rim insertion portion 3 ' configured to fit into an aperture in the tire rim. There is a piston 8 ' disposed within the housing. The piston includes a valve member 19 '. A coil spring 22 ' acts between the housing and piston so that in use of the apparatus the piston is biased to a open position for passage of air into the tire and is movable against the spring bias under air pressure build-up in the tire to a closed position at which the valve member seals against a valve seat. The piston and spring are located in the central portion of the housing clear of the rim insertion portion. The rim insertion portion is of a reduced size not obstructive to the mounting of the tire.
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