The valve is closed by swinging the valve element through 90 degrees thus moving the valve element passage out of {HEAD ~ registry} with {TAIL ~ the ports} 13 13 of the chamber 
with
The valve is closed by swinging the valve element through 90 degrees thus moving the valve element passage out of { HEAD ~ registry } with { TAIL ~ the ports } 13 13 of the chamber
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH