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