| 摘要 |
<p>The invention concerns a positive displacement pumping device comprising a pumping member (1) associated with a dispensing member (3) including a body (10) containing a dispensing chamber (11) comprising orifices (12, 14, 13) connecting it to the pumping member, to an intake conduit (30) connected to a feeding vessel (2), and to a delivery conduit (32), and wherein a dispensing element (17) is mounted mobile along a longitudinal axis of the dispensing chamber (11), the connecting orifices (14, 13) and the intake conduit facing each other coaxially with the longitudinal axis of the dispensing chamber on either side of the orifice (12) connecting to the pumping member, and being adjacent seats (34, 33) facing inside the dispensing chamber with which co-operate check valve forming parts (16, 15) provided at the ends of the dispensing element (17) to enable one or the other of the connecting orifices (13, 14) to be closed.</p> |
