The company announces its need for supply of check valves, horizontal, swing, carbon steel, flanged, raised face, bs 1868/ap1 6d/ koc-mp-015, bolted cover, ASTM A 182/f6, ASTM A182/f6, manual, class 600, 10 inch, sour service- nance mr 0175 horizontal swing check valve. All material to clause 6.6 of koc standad koc – mp -015. Bolted cover, full bore. standard: bs -1868/apl 6d/koc-mp-015. bolted material: ASTM 193 B7& ASTM 194 2h. No visible leakgae allowed in all tests. No repair allowed. Valve to conform to nace mr 0175. restricted to approved list of manufacturer code : 23.4.seal welded seat ring acceptable.