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