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