Patent ID: 8360121

Claim:
A method of controlling an inner pressure of a tyre mounted on a rim, said method comprising the steps of: inflating an inner volume of the tyre to an operating pressure at a reference temperature; admitting a fluid compressed to a first pressure higher than the operating pressure of the tyre at the reference temperature into a tank associated with the rim; bringing the inner volume of said tyre into communication with said tank when the pressure of the inner volume of said tyre is lower than said operating pressure, by means of at least one mechanical valve opening which is controlled by an elastic element having an elastic constant, the elastic element being operatively associated with at least one moveable non-deformable closure member designed to open and close at least one port in said valve, and the elastic constant varying within a temperature range of −50° C. to +50° C. in such manner that said valve is maintained in a closed position following a reduction in the inner tyre pressure due to a temperature reduction within said range; and stopping the communication between said inner volume and the tank when said tyre pressure is substantially equal to said operating pressure, wherein said step of bringing the inner volume of said tyre into communication with said tank takes place when the pressure of the inner volume of said tyre is lower than said operating pressure by at least 5%.