| 摘要 |
A Schrader (American) valve/Presta (French) valve dual-purpose valve cap includes a casing comprising an axle hole, an end portion, and a through hole; a rotating device comprising a rod-like body and two heads, each head having a screw hole, 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 and an annular groove, the annular groove defining an annular air passage, the rod-like body defining a through hole; two O-shaped seal rings sealed 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; 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.
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