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