| 摘要 |
<p>The dosing arrangement comprises two first pumps (1, 2) and (1, 2') for a liquid medium B whose pistons (1, 1') are mutually connected by a piston rod (12), and two other pumps (3, 4) and (3', 4') for a liquid medium A which are positioned outside in continuation of and coupled to the pumps for liquid B. The two pumps for liquid B are firmly fixed to a central body (5) which is hollow and filled up with liquid B, and in which are mounted two mutually connected suction valves (6, 6') which are activated by the pistons (1, 1') by means of a push rod (9) and switched over momentarily from one extreme position to another by a spring mechanism (fig. 7) and two exhaust valves (7) whose movements are derived from the valves (6, 6'). Furthermore, the central body (5) incorporates an opening/closing arrangement (figs. 2, 4, 6, 8 and 9), which can admit a variable volume of liquid B through a valve (36) into the cylinder for liquid A (4 or 4'), which is under a suction pressure, whereby the proportion of mix can be regulated.</p> |
