In the pump plunger and spool valve, on the one hand a control groove that runs obliquely to the stroke direction is provided, and on the other hand a spill opening that cooperates therewith is provided, which together bring about {TAIL ~ a relief} of pressure of {HEAD ~ the pump chamber} when they overlap 
In the pump plunger and spool valve , on the one hand a control groove that runs obliquely to the stroke direction is provided , and on the other hand a spill opening that cooperates therewith is provided , which together bring about { TAIL ~ a relief } of pressure of { HEAD ~ the pump chamber } when they overlap
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