| 摘要 |
<p>A check valve and, in particular, an anti-siphon valve, for medical infusion lines and the like, including an axial upstream passageway (6) and an axial downstream passageway (14), staggered and parallel with respect to each other, and a diaphragm (9) of elastic material cooperating with an annular valve seat (25) for normally keeping communication between these passageways closed. The diaphragm is composed of the end wall (18) of a cup-shaped element (17) on which a plunger (9) rests coaxially, the plunger (9) being slidable between a retracted inoperative position and an advanced operative position. Valve opening occurs following flexion of the diaphragm (18), which can be spontaneous due to a predetermined fluid pressure developing in the upstream passageway (6), or positively operated via the plunger (9). <IMAGE></p> |
