a rotary valve element in said valve sleeve, said rotary valve element and said valve sleeve having a common axis, said {HEAD ~ rotary valve element} and said {TAIL ~ valve sleeve} having registering valve lands 
a rotary valve element in said valve sleeve , said rotary valve element and said valve sleeve having a common axis , said { HEAD ~ rotary valve element } and said { TAIL ~ valve sleeve } having registering valve lands
OTH OTH OTH 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 HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH