The bottom of the electric casting tank is provided with an exhaust pipe which is besprinkled with tiny holes, and oil-freecompressedair are put in the exhaust pipe to play stirring action.
在电铸槽底部设一布满微孔的排气管，并通入无油压缩空气起搅拌作用；
2
Only no oil to produce an air compressor oilfreecompressedair.
只有无油空气压缩机才能产生无油的压缩空气。
3
When air padding is allowed and appropriate, it is imperative that clean, oil-free, cooled, dry compressedair be introduced into the vapor space.