procurement of spare for mil make valves installed at boiler of 1 x 500mw unit at sgtps mppgcl birsinghpu procurement of spare for mil make valves installed at boiler of 1 x 500mw unit at sgtps mppgcl birsinghpur , sh attemperation common block valve , tag no . sd 35 , model no . 38-414x1 , serial no . 252447 size 150nb class 2500 , gland packing ring set , body gasket , seal ring / pressure seal , seat ring gasket , yoke gasket , sh attemperation branch line block valve , tag no . sd 36 to 39 , model no . 38-412x1 , serial no . 252448 to 252451 size 100nb class 2500 , plug stem s / a , gland packing ring set , body gasket , seal ring / pressure seal , seat ring , seat ring gasket , yoke gasket , sh attemperation branch line control valve , tag no . sd 40 to 43 , model no . 38-41238 , serial no . 252452 to 252455 size 100nb class 2500 , plug stem s / a , gland packing ring set , body gasket , seal ring / pressure seal , seat ring , seat ring gasket , cage , yoke gasket , rh attemperation common block valve , tag no . sd 44 , model no . 38-412x1 , serial no . 252456 size 80nb class 1500 , plug stem s / a , gland packing ring set , body gasket , seal ring / pressure seal , seat ring gasket , yoke gasket , rh attemperation branch line block valve , tag no . sd 45 to 48 , model no . 38-412x1 , serial no . 252457 to 252460 size 65nb class 1500 , gland packing ring set , body gasket , seal ring / pressure seal , seat ring gasket , cage , yoke gasket , rh attemperation branch line control valve , tag no . sd 49 to 50 , model no . 38-41231 , serial no . 252461 to 252464 size 65nb class 1500 , gland packing ring set , seal ring / pressure seal , seat ring , seat ring gasket , cage , yoke gasket , hfo gun line valve tag no . ho60d , model no . 38-21126 , serial no . 260247 , size 25nb class 300 , gland packing ring set , yoke gasket , atomizing steam & scavenging valve tag no . os59d & 60d , model no . 38-21125 , serial no . 260270 , size 25nb class 300 , gland packing ring set , yoke gasket , ldo line valve tag no . lo40a , model no . 25126 , serial no . 260266 , size 25nb class 300 , plug stem s / a , gland packing ring set , body gasket , seat ring , air atomizing line valve tag no . ao20 , model no . 225126 , serial no . 260242 , size 25nb class 300 , plug stem s / a , gland packing ring set , body gasket , seat ring