When the valve is closed, {HEAD ~ current} flows from {TAIL ~ electrode} 240 to electrode 242 through strip 245 
When the valve is closed , { HEAD ~ current } flows from { TAIL ~ electrode } 240 to electrode 242 through strip 245
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH