| 摘要 |
<p>A valve comprising a manoeuvring stem (7) provided with at least one end portion (20) and an operating knob (12) provided with an end portion (13) to be coupled to said at least one end portion of the stem by means of one or more grooved elements (9,15), wherein the end portion of the knob and/or terminal portion of the stem comprises at least one housing seat (16) accommodating at least one holding means (11) to be snap-engaged on at least one coupling seat (10) provided on the terminal portion of the stem and/or end portion of the knob, respectively.</p> |
