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