| 摘要 |
<p>The invention relates to a fluid product dispensing pump (100; 200; 300) consisting of: a push rod (120; 220; 320) comprising a support wall (121; 221; 321) defining an outer support surface (1211; 2211; 3211) and an inner surface (1212; 2212; 3212), and a peripheral skirt (122; 222; 322) which extends from the inner surface of the support wall; a pump chamber (1) comprising an inlet check valve and an outlet; a dispensing port (125; 225; 325) through which the fluid product is dispensed; a main piston (136; 236; 336) which is used to vary the volume of the pump chamber; and a differential piston (131, 132, 133; 231, 232, 233; 331, 332, 333) which can move inside the pump chamber in response to a pressure variation therein. According to the invention, the differential piston can move away from the support wall when the pressure in the pump chamber increases and the push rod and the differential piston can move along an actuation axis (X) which extends essentially perpendicular to the support wall. The invention is characterised in that the differential piston is formed as a single piece together with a mobile inlet check valve member (138; 238; 338) which co-operates with an inlet check valve seat (1161; 2161; 3161).</p> |
