Valve element for drilling elements, drilling elements and method for assembling the valve element to drilling elements

A valve element for selectively opening and closing both a radial aperture and an axial hole in a drilling element for drilling mud circulation;

• said valve element comprising:
• a fixing portion adapted to sealingly fix the valve element to walls of a hole defining said radial aperture of the drilling element;
• a body comprising an inlet aperture and an outlet aperture, and a duct for putting said inlet aperture and said outlet aperture in communication with each other, defining a path for the drilling mud;
• a plug adapted to be fixed to said body to selectively seal said inlet aperture of the body;
• a first sealing element adapted to be positioned in a housing formed in the axial hole of the drilling element;
• a single shutter pivoted to the body and comprising a second sealing element adapted to selectively and sealingly close said outlet aperture of the body;
• said shutter being adapted to selectively and sealingly close said axial hole by abutting against said first sealing element;
• said shutter being adapted to keep said outlet aperture of the body normally closed;
• when said valve element is associated with radial aperture of the drilling element and said valve element is in a closed configuration, said single shutter protrudes no further than a minimum diameter of said axial hole.