For {HEAD ~ the controlling} of the phase position and duration of {TAIL ~ the valve actuation}, the pump plunger and the spool valve are able to be rotated relative to one another, and the spool valve is able to be displaced relative to the pump plunger 
For { HEAD ~ the controlling } of the phase position and duration of { TAIL ~ the valve actuation } , the pump plunger and the spool valve are able to be rotated relative to one another , and the spool valve is able to be displaced relative to the pump plunger
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH