ARRANGEMENT ON A PUMP UNIT

摘要

Pump units comprising a metering reciprocating pump with adjustable length of stroke are used in packing machines for filling of packing containers with a metered quantity of flowable contents, e.g. yoghurt. Adjustments in the length of stroke in order to adapt the amount of filling goods to the volume of the packing container interferes with the breaking sequence at the extreme position of the piston and alters the time for each pumping stroke. These drawbacks are avoided by means of an arrangement which includes a movable braking device (16) for the piston (6) as well as a valve arrangement (10,11) which is linked to the braking device (16) and serves to adapt the speed of the piston to the length of stroke.