Tender For supply of c. s. swing check valve as per bs-1868; size 6" (150 nb) ; raised flanged ends as per asme/ansi b16.5, , cast steel gate valve 8" ( 200 nb) as per attached specifications , cast steel nrv 8" ( 200 nb) as per attached specifications) , gate valve class 300, size- 6" (150nb) as per attached specifications