supply of check valves and nrvs for unit 5 and 6 of csctpp chhabra , cast iron nrv’s class – 150.wcb of following sizes: , a 80 mm , b 100 mm , c 150 mm , d 200mm , e 250 mm , f 300 mm , cast iron nrv’s class – 125. of following sizes: , a 25 mm , cast steel spring loaded , non slam disc, disc check valve, wafer ends to b16.5, 150# fluid air , a 150 nb, 4 kg/cm2, 150oc , ss nrvs, rising stem,flanged ends, (pn10, )bolted cover,swing type of following sizes: , a 25 mm , b 50 mm , cast iron spring loaded , dual flap check valve, wafer ends pn16 , a 350 nb, 16 kg/cm2 , cast carbon steel floating check valves class – 150 in following sizes:- , a 80 mm , b 100 mm , c 150 mm , forged stainless steel liftcheck valves class – 800in following sizes:- , a 25 mm , b 50mm , cast stainless steel swing type check valve, class – 150in following sizes: , a 80 mm , b 200 mm , c.i. rubber pad(silicon/neoprene) nrv threaded end with ss disc of following sizes: , a 20 mm , b 25 mm , c 40 mm , d 50 mm , e 65 mm , dmcw discharge nrv , a 600nb , copper alloy life check valve screwed in bonnet , a 40 nb , b 50 nb , caststeel wafer check valve for air lines, pn-20 rating, , a 80 nb , b 100 nb , c 200 nb , d 250 nb , e 300 nb , ball check valves , a 25 mm , b 40 mm , c 50 mm , cirl nrv , a 50 mm , b 80 mm , c 100 mm , d 150 mm , e 200 mm , cast iron wafer check valve, lug end connection, class 150 , a 400mm , b 600mm , cast iron swing check valve, class – 150in following sizes: , a 50 mm , b 100mm , c 200mm , d 250mm , e 300mm , cast iron dual plate check valve, double flange end connection class – 150 , a 80mm , b 100mm , c 150mm , d 200mm , e 400mm , cast iron nrvs class-125, swing type and bolted cover, flate faced flaged end as per ansi/asme b-16.5 design, is-5312 i) body, disc, cover & hinge- c.i. ii) disc/body seat ring- leaded tin bronze as per is:318gr. ltb-2 iii) hinge pin- ss 410(h) iv) nut, bolt, stud & washers-ht of following sizes:- , a 80nb , b 100nb , c 200nb , d 250nb