The membrane communicates with the chute such that {HEAD ~ the center portion} of the membrane is deflected in {TAIL ~ response} to a given pressure increase in the chute, in order to actuate the switch 
The membrane communicates with the chute such that { HEAD ~ the center portion } of the membrane is deflected in { TAIL ~ response } to a given pressure increase in the chute , in order to actuate the switch
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH