This means that {HEAD ~ the arrangement} can regulate any displacement volume or {TAIL ~ displacement flow} dynamically and continuously 
regulate
This means that { HEAD ~ the arrangement } can regulate any displacement volume or { TAIL ~ displacement flow } dynamically and continuously
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH