A fluid seal assembly for a rotary valve comprising a valve housing having {HEAD ~ a cylindrical valve opening} and a rotary valve sleeve in {TAIL ~ said valve opening} 
A fluid seal assembly for a rotary valve comprising a valve housing having { HEAD ~ a cylindrical valve opening } and a rotary valve sleeve in { TAIL ~ said valve opening }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL