Patent ID: 8048247

Claim:
A method for manufacturing a tyre for a vehicle wheel, comprising the steps of: a) forming a green tyre; b) closing the green tyre in a vulcanisation mould having holding walls defining an inner surface of a moulding cavity, said inner surface conforming in shape to the final conformation to be given to the green tyre; c) pushing the green tyre toward said holding walls of said mould; d) evacuating a fluid present between an outer surface of said green tyre and the holding walls of said mould, said evacuating step comprising the steps of: d1) arranging at least one vent valve in said holding walls, said vent valve comprising a duct having an inlet end opening onto said inner surface of said moulding cavity and a closure member having a closing head which is axially movable relative to said duct; and d2) transferring said fluid from the moulding cavity to the duct through a connecting passage confined between an inner wall of said duct and the closing head of the closure member set to an open position; e) bringing the green tyre into contact with the closing head of the closure member to push the latter into the duct so as to achieve the closed condition of said at least one vent valve and to mechanically engage the green tyre with at least one grip element set on said closing head; f) opening the vulcanisation mould in such a manner as to separate the moulded tyre from the inner surface of said moulding cavity and to exert a pulling action on said grip element by the tyre to bring the closure member back to the open position.