In this embodiment, the generally flat surface at {HEAD ~ the top} of the dome and the diaphragm are both generally circular in shape and the center point of these circular surfaces are roughly aligned such that the central area of the diaphragm and the central area of {TAIL ~ the valve seat} are inter engaged 
In this embodiment , the generally flat surface at { HEAD ~ the top } of the dome and the diaphragm are both generally circular in shape and the center point of these circular surfaces are roughly aligned such that the central area of the diaphragm and the central area of { TAIL ~ the valve seat } are inter engaged
OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH