{TAIL ~ The diaphragm} floats freely above the generally flat top of {HEAD ~ the dome}, not in any significant way clamped, pinched or held against the truncated dome shaped valve seat 
{ TAIL ~ The diaphragm } floats freely above the generally flat top of { HEAD ~ the dome } , not in any significant way clamped , pinched or held against the truncated dome shaped valve seat
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH