The size of discharge cross section of the nozzle varies through movement of the nozzle parts which respond to {HEAD ~ pressure} created in {TAIL ~ the switch}, without the assistance of elaborate compression springs 
The size of discharge cross section of the nozzle varies through movement of the nozzle parts which respond to { HEAD ~ pressure } created in { TAIL ~ the switch } , without the assistance of elaborate compression springs
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 REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH