| 摘要 |
<p>The pipe fitting includes a movable seat equipped with an appendix enagageable from its front side by the mouth during the approach of the pipe fitting to the mouth. As a result of such engagement, the movable seat moves to a latching position to put itself on a flange portion of the mouth and to keep the latter in close contact with the end of the pipe fitting. In the meantime the movable seat releases an elastically stressed bar which in its turn unlocks a check-valve in the fitting, allowing to open. Once it is free, the bar keeps moreover the movable seat in its latched position.</p> |
