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