ISO9001, CE Approved No gas leaks.OEM/ODM service Explosion-proof motor/device to option Constant working liquid temperature Product Description . There are two kinds of structure: single level and two-levels structures. According to the kind of medium, it can be made by cast iron, stainless steel, cast steel, ductile iron, 316 stainless steel, complex stainless steel, Hastelloy alloy or titanium ...