The membrane includes a bellows portion for increasing {HEAD ~ the distance} by which {TAIL ~ the membrane} can be deflected in response to the given pressure increase 
The membrane includes a bellows portion for increasing { HEAD ~ the distance } by which { TAIL ~ the membrane } can be deflected in response to the given pressure increase
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH