When {HEAD ~ a fluid pressure} in the extension chamber exceeds {TAIL ~ a certain level}, the pressure relief assembly allows fluid to flow through the relief passageway 
exceeds
When { HEAD ~ a fluid pressure } in the extension chamber exceeds { TAIL ~ a certain level } , the pressure relief assembly allows fluid to flow through the relief passageway
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH