Patent ID: 8360090

Claim:
A Schrader (American) valve/Presta (French) valve dual-purpose valve cap, comprising: a casing comprising an axle hole, an end portion outwardly extended from the periphery thereof, and a through hole cut through the end portion in communication with the axle hole; a rotating device comprising a rod-like body rotatably accommodated in the axle hole of the casing and two heads respectively located on two distal ends of the rod-like body and disposed outside the casing and rotatable with the rod-like body relative to the casing, each head having a diameter greater than the rod-like body and a screw hole extending from an outer end edge toward an inner side thereof, the screw hole of one head being adapted for receiving a Presta valve, the screw hole of the other head being adapted for receiving a Schrader valve, the rod-like body comprising an accommodation chamber, two through holes respectively disposed in communication between the accommodation chamber and the screw hole of each of the two heads and an annular groove extending around the periphery thereof, the annular groove defining an annular air passage in the axle hole in communication with the through hole of the end portion of the casing, the rod-like body defining a through hole in the annular groove in communication between the annular air passage and the accommodation chamber; two O-shaped seal rings respectively mounted on the rod-like body of the rotating device at two sides relative to the annular groove to seal the annular air passage; and a ball accommodated in the accommodation chamber; wherein two semispherical recesses respectively formed on an inside wall of the accommodation chamber at the connection area between the accommodation chamber and through hole of each of the two heads; the ball has a radius smaller than the radius of the semispherical recesses and greater than the radius of the through hole of each of the two heads.