| 摘要 |
<p>A dispensing unit for liquid or pasty media comprises a container (1) onto the neck (2) of which a metering pump (5) having two parts (11, 16) is placed. A hollow-cylindrical first part (11) of the metering pump (5) adjoins the neck (2) and has a first one-way valve (6) with a first valve body (7) at an intake opening. A piston-forming second part (16) of the metering pump (5) has an outer actuating projection (17) for a stroke (h) of the metering pump (5), extends displaceably in the first part (11), and, at an intake opening which is aligned with the dispensing opening, has a second one-way valve (8) with a preferably spring-loaded, second valve body (9). Both one-way valves (6, 8) open in the same direction and the distance (a) between the two valve bodies (7, 9) is variable. The first valve body (7) arranged in the intake opening is designed as an opening stop for the second valve body (9) arranged in the opposite dispensing opening.</p> |
