bids are invited for 3 inch nrv - cs non return valve, bolted cover, flanged 150 class, body and cover astm a216 gr. wcb, trim 13 percent cr, rating 150 class, mfg std bs1868 or similar, insp & test std bs 6755 or similar, ends flanged to asme b16.5 asa 150 class , 4 inch nrv - cs non return valve, bolted cover, flanged 150 class, body and cover astm a216 gr. wcb, trim 13 percent cr, rating 150 class, mfg std bs1868 or similar, insp & test std bs 6755 or similar, ends flanged to asme b16.5 asa 150 class , 6 inch nrv - cs non return valve, bolted cover, flanged 150 class, body and cover astm a216 gr. wcb, trim 13 percent cr, rating 150 class, mfg std bs1868 or similar, insp & test std bs 6755 or similar, ends flanged to asme b16.5 asa 150 class , 12 inch nrv - cs non return valve, bolted cover, flanged 150 class, body and cover astm a216 gr. wcb, trim 13 percent cr, rating 150 class, mfg std bs1868 or similar, insp & test std bs 6755 or similar, ends flanged to asme b16.5 asa 150 class , 2 inch gate valve - cs rising stem gate valve, os and y bolted bonnet, body and bonnet astm a216 gr. wcb, trim 13 percent cr, rating 150 class, mfg std api 600 or similar, insp & test std api 598 or similar ends flanged to asme b16.5 asa 150 class , 3 inch gate valve - cs rising stem gate valve, os and y bolted bonnet, body and bonnet astm a216 gr. wcb, trim 13 percent cr, rating 150 class, mfg std api 600 or similar, insp & test std api 598 or similar ends flanged to asme b16.5 asa 150 class , 4 inch gate valve - cs rising stem gate valve, os and y bolted bonnet, body and bonnet astm a216 gr. wcb, trim 13 percent cr, rating 150 class, mfg std api 600 or similar, insp & test std api 598 or similar ends flanged to asme b16.5 asa 150 class , 6 inch gate valve - cs rising stem gate valve, os and y bolted bonnet, body and bonnet astm a216 gr. wcb, trim 13 percent cr, rating 150 class, mfg std api 600 or similar, insp & test std api 598 or similar ends flanged to asme b16.5 asa 150 class