... 16MnR steel plate 2 advanced rubber seal packing collar 3 leak-proof Industrial Steam Still Kettle Plant in XindaUsage:used in cement ... the kettles doors, so it is easy to install and leak proof, what’s more, it has a long operating life.5 ... , pressure gauge, measure temperature elements, vent valve, inlet valve, air proof ball valve, drain valve, and other necessary valves and meters ...