| 摘要 |
The invention relates to a safety valve (2) for inflating playing balls used for games and sports, consisting of a guide body (4) provided with an axial perforation and a valve body (3), movable inside said perforation. The valve body (3) has a frustoconical head (6) able to bear against the walls of a conical middle section (4b) of said axial perforation. Said valve body (3) is movable axially under the action, on the one hand, of the pressure of the inflating air and, on the other hand, of pressure means (10); it also has an annular groove in which O-ring type sealing means are seated.
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