| 摘要 |
1. Device to collect samples of liquid flowing in a conduit (2; 21) or to inject a liquid into this conduit (2; 21) comprising a valve (1; 20) mounted on the said conduit (2; 21), the body (3; 23; 35) of which is traversed through by the stem of an axially movable needle member (6; 24; 38), one end of this stem being provided with a frustoconical point for the obturation of a through passage (4; 22; 37) provided in the body (3; 23; 35), the other end being connected to outer control means (7; 25; 45) permitting to operate the said needle member, sealing means (8; 47) being interposed between the said stem and the said body (3; 23; 35), characterized by the fact that the arrangement of the needle member (6; 24; 38) is such that, when it is closed, the ending face of its frusto-conical point is flush with the outer end of the said through passage (4; 22; 37). |
