The valve further comprises {HEAD ~ orifice means} to permit {TAIL ~ metered flow} between the chambers 
to permit
The valve further comprises { HEAD ~ orifice means } to permit { TAIL ~ metered flow } between the chambers
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH