| 摘要 |
Dosing apparatus for adding a metered quantity of liquid additive to slurry or other flowable material handled by a ram-type positive displacement main pump (10) includes a positive displacement motoring pump (32) whose outlet (44) connects into a material carrying portion of the main pump e.g. its inlet (22). The motoring pump is driven by a rocking lever (48) connecting it to the main pump ram (14) through adjustment means comprising a lead screw (62) along an arm (50) of the lover for selectively shifting a slide block (68) linked to the motoring pump piston rod (42); the slide block being secured against movement on the lever arm once adjustment has been effected by clamping means (74). <IMAGE>
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