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