Apparatus 1 wherein said second normally closed valve means further comprises at least two normally closed valves generally in {HEAD ~ parallel} along said second flow path, {TAIL ~ each such valve} being responsive to fluid pressure in said second flow path to move from a closed first configuration to an open second configuration for fluid communication therethrough along said second flow path 
Apparatus 1 wherein said second normally closed valve means further comprises at least two normally closed valves generally in { HEAD ~ parallel } along said second flow path , { TAIL ~ each such valve } being responsive to fluid pressure in said second flow path to move from a closed first configuration to an open second configuration for fluid communication therethrough along said second flow path
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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