supply of check valves :-forged carbon steel lift check valve with socket weld ends as per the following specification: size - 1 / 2 class 800 moc: body - astm a 105; cover - astm a 105; disc-a 276-410 ( h ) ; seat - st6 ( integral ) ; spring - a313-ss302; hex . bolt - astm a 193 gr . b7; gasket- spiral wound ss 304 with graphite; end connections - socket weld ends as per asme b16 . 11; valve design as per bs 5352; valve testing as per api 598; pressure temperature rating as per asme b16 . 34; note: 1 ) hydrostatic test certificate ( as per api-598 ) to be furnished along with supply . 2 ) valve to be sypplied suly painted by al . paint if min . 40 micron dft & packed with proper flange cap protector . , forged carbon steel lift check valve with socket weld ends as per the following specification: size - 3 / 4 class 800 moc: body - astm a 105; cover - astm a 105; disc-a 276-410 ( h ) ; seat - st6 ( integral ) ; spring - a313-ss302; hex . bolt - astm a 193 gr . b7; gasket- spiral wound ss 304 with graphite; end connections - socket weld ends as per asme b16 . 11; valve design as per bs 5352; valve testing as per api 598; pressure temperature rating as per asme b16 . 34; note: ( 1 ) mtc and hydrotest certficate is to be furnished . ( 2 ) valve guarantee certificate is to be provided along with supply , check valve 1 . 5 800# sw body a105 , body seat ring a182 f304 stellited disc a182 f304 , type of disc ball , lift check valve , 1 , 800 # , sw ends conforming to ansi b 16 . 11 , design as per api 600 , testing as per api 598 , body & cover astm a 105 , studs astm a 193 gr . b7 , nuts astm a 194 gr . 2h . disc a 182 f6 , gasket graphite + ss 304