... is made out of an integral 16MnR pressure steel plate. An integral 16MnR steel plate ... top of the door of kettles installs counterweight device .So it is convenient to open. Also, ... produced according to national standard GB150-1998 STEELED PRESSURE VESSEL, and inspected by The State Bureau ... autoclave set up such fittings as safety valve, pressure gauge, measure temperature elements, vent valve, inlet ...