Method and apparatus for manufacturing tyres for vehicle wheels

An apparatus for manufacturing tyres for vehicle wheels, comprising:

• devices designed to form a green tyre;
• at least one 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;
• and
• devices for transferring the green tyre into the moulding cavity,
• said vulcanisation mould comprising a plurality of vent valves of said moulding cavity, at least one of said valves comprising:
• a duct having an inlet end opening onto said inner surface of said moulding cavity, and
• a closure member having a closing head that is axially movable relative to the duct between:
• a closed position, at which said closing head forms a contact seat with an inner wall of said duct, said contact seat being defined in said inlet end;
• and
• an open position at which said closing head and inner wall of said duct confine a passage for connection with said moulding cavity, said contact seat being spaced apart from said inner surface of the moulding cavity so that an embedding recess is defined between the inner surface of the moulding cavity and the closing head of the closure member in the closed position.