A method of manufacturing a non-lubricated double block emissions plug valve for two metal molecule junction plug unit

摘要

It is formed from a metal plug unit SOLUTION: A plug valve has two different types, the other is used for the trunnion or stem plug one. In the PREFERRED EMBODIMENT Preferred embodiments, the plug is formed from high-end stainless steel trunnion or stems from ductile cast iron. When injected into the plug-type molten iron housing a steel stem, the two metals are joined at the molecular surface of each. Mechanical bond is also formed by a pin of the iron through a hole in the stainless steel stem.