procurement of two way vent valves complete assembly with actuator and its spares and spares of 18 swing disc complete assembly for ahp i of unit no 1 and 2 at sgtps mppgcl birsinghpur , two way vent valve complete assembly with actuator and its spares , two way vent valve complete assembly material: casing-alloy cast iron – hardness 180-200 bhn valve seat & disc- high chrome/steel ceramic seating face , valve seat for two way vent valve moc- high chrome/steel ceramic seating face , valve disc for two way vent valve moc- high chrome/steel ceramic seating face , spares for 18” swing disc gate complete assembly with actuator , seat and disc(complete set) for 18”swing disc gate valve assembly(transfer hopper) material disc:ms to is 2062 seat:alloy cast steel hardness 250 to 300 bhn , centre bolt withbush