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