The valve member has a first state in which it permits {HEAD ~ fluid} to flow from {TAIL ~ the first port} to the second port and a second state in which it permits fluid to flow from the second port to the third port 
The valve member has a first state in which it permits { HEAD ~ fluid } to flow from { TAIL ~ the first port } to the second port and a second state in which it permits fluid to flow from the second port to the third port
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL 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 OTH OTH OTH OTH