{HEAD ~ control} means on the opposite side of said diaphragm from said closure valve, having a head bearing against said diaphragm, for acting through said {TAIL ~ diaphragm} to move said closure valve toward and away from closure 
{ HEAD ~ control } means on the opposite side of said diaphragm from said closure valve , having a head bearing against said diaphragm , for acting through said { TAIL ~ diaphragm } to move said closure valve toward and away from closure
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 TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH