Tender For supply of purchase of different type valves for auxiliaries c c - cast steel gate valve size 100 mm class 150 cast steel bolted bonnet flanged end , cast steel gate valve size 150 mm class 150 cast steel bolted bonnet flanged end , gate valves cast steel bonnet class 150 carbon steel end connection flanged end size 250 nb , gate valve cast steel 12inch or 300mm dia , cast steel non return valve or swing check valve size 150 mm class 150 , nrv 250nb cast carbon steel to a 216 gr 150 swing type flanged ends , cast steel non return valve swing check valve class 150 size 300mm , wafer type butterfly valve size 150nb , wafer type butterfly valve size 200nb