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