In addition, the bias means control {TAIL ~ deformation} of {HEAD ~ the valve member} so as to prevent undesirable, excessive opening of the valve 
In addition , the bias means control { TAIL ~ deformation } of { HEAD ~ the valve member } so as to prevent undesirable , excessive opening of the valve
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH