| 摘要 |
The invention relates to a wheel valve ( 1 ) for the tyre of a vehicle, comprising a non-return valve ( 11 ), two half-bodies ( 3,4 ) defining a cavity and assembled with a membrane ( 6 ) inserted therebetween acting as a sealing joint between said half-bodies, said non-return valve comprising a tubular element ( 12 ) which is connected to the membrane and inside which the closing element ( 18 ) can move between a seat ( 17 ) and a base ( 20 ), said closing element being applied against the seat by means of the pressure prevailing in the tyre. The closing element ( 18 ) is subjected to the action of a magnetic field ensuring the maintainance thereof at the base ( 20 ) so that the valve can be kept open and that the tyre can deflate slowly. It is made of a steel ball ( 18 ) which cooperates with the seat ( 17 ) and which is defined by a ring ( 1 ) which is inserted into the tubular element ( 12 ). The magnetic field is produced with the aid of a magnetized element ( 22 ) disposed in the vicinity of the membrane ( 6 ).
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