by pressing the pusher by {HEAD ~ the operating portion} to cause {TAIL ~ the spool} to slide, liquid pressure from the pump port is supplied to the output port 
to cause
by pressing the pusher by { HEAD ~ the operating portion } to cause { TAIL ~ the spool } to slide , liquid pressure from the pump port is supplied to the output port
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH