supply of check valve at rcf trombay unit , wafer type check valve of following specifications: size-4 , pressure class asa 150 , design specification: a ) eccentric disc shaft connection b ) opens on extremely low pressure differential c ) 100% tight shut off in return direction d ) one piece body e ) disc seat sealing by o ring f ) short face to face dimensions g ) flange sealing is obtained by gasket . material of construction a ) body & disc - ss 316 cast ( cf8m ) b ) hinge pin - aisi 316 c ) sealing - ptfe . , wafer type check valve of following specifications: size-8 , pressure class asa 150 , design specification: a ) eccentric disc shaft connection b ) opens on extremely low pressure differential c ) 100% tight shut off in return direction d ) one piece body e ) disc seat sealing by o ring f ) short face to face dimensions g ) flange sealing is obtained by gasket . material of construction a ) body & disc - ss 316 cast ( cf8m ) b ) hinge pin - aisi 316 c ) sealing - ptfe . , check valve 3 150# , end connections 150# rf flange as per ansi b 16 . 5 , type: swing check valve , material: body and cover astm a 216 wcb , cove r stud/ nuts: a193 b7/ a194 2h , hinge pin aisi 410/ a 182 f6 , disc < ( >&< ) > bo dy seat , ring: a217 ca-15 or a216 wcb+13% cr facing , design as per bs 18 68 testing as per api 598/bs 5146 , face to face asper ansi b 16 . 10 , check valve , swing type , 4 , 150# , flange end connection . end connection conforming to ansi b 16 . 5 , pressure < ( >&< ) > temperature as per ansi b 16 . 34 , end to end dimensions as per ansi b 16 . 10 , valve shall be hydraulically tested as per api 598 , valve design as per api 600 . moc of valve: body < ( >&< ) > cover - astm a 216 gr . wcb . studs - astm a 194 gr . b7 . nuts - astm a 193 gr . 2h . hinge pin - aisi 410/a 182 f6 . disc < ( >&< ) > body seat ring - astm a 217 ca-15