{HEAD ~ A check valve} 10 is provided in {TAIL ~ feed line} 1 to prevent the return flow of inert gas which has been contaminated by magnesium in the casting furnace 
is provided in
{ HEAD ~ A check valve } 10 is provided in { TAIL ~ feed line } 1 to prevent the return flow of inert gas which has been contaminated by magnesium in the casting furnace
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL 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