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