b'DOUBLE OFFSET BUTTERFLY VALVESDOUBLE OFFSET BUTTERFLY VALVESMODEL SLHBF, SLHBFFS 150 TO 1500 CLASS DOUBLE OFFSETRANGE & STANDARDSSize50NB - 1800NB (2 to 72)Class150 to 1500 ANSIGeneral DesignAPI 609 (Cat B) & ASME B16.34 APII 6076th &7th Ed. API 622 2011 2nd EditionnAP6076th &7th Ed. API622 2011 2nd EditioAPI 622 & ISO 15848-1 ISO 10497-5 ISO 15848-2ISO 10497-5Design StandardsFlangedMSS-SP-67Endurance Test Certified Firesafe Certified Fugitive Emission CerFiresafe Certi\x1fed Fugitive Emission Certifiedti\x1fedWaferMSS-SP-68/ API 609-B Wall ThicknessAPI 609Construction Wafer,lugged,flangedPressure/ Temp. ASME B16.34 & API 609-B / ISO 5752Face to FaceASME B16.10 short / MSS-SP-67 / MSS-SP-68/API 609-B/ ISO 5752 shortFlange DimensionsASME B16.5, over 600NB (24) - MSS-SP-44 or API 605 or ASME B16.47, AS 4331.1, ISO 7005-1, E1092-1 PN10 ~ 250 also availablePressure TestAPI 598, ISO 5208, EN 1266, MSS-SP67Leakage RatesFCI 70-2 Class VI up to zero leakage API 598 / ISO 5208Temperature RangeResilient Seal (Soft) -46C to 220C (-50F to 428F)Metal Seal -46C to 900C (-50F to 1652F)PRINCIPLES OF VALVE DESIGNThestandardSLHBF/SLHBFFSdesignisdoubleoffset(doubleeccentric). Availableinfiresafe&nonfiresafeinsoftandmetalseated.ThesoftseatedversionincorporatesametalseatretainerwithanRPTFEinsertforhighpressureserviceandlonglife.ThebasicconceptoftheSLHBF/SLHBFFSistoonlyutiliseathinsliceofaballvalveattheseatringarea.Thebodyisonlywideenoughtoholdthedisc,shaft&seatinplace,alltheremainingmaterialiseliminatedbecauseitservesnopurpose.Ballvalveshave2seats,butfloatingballsonlysealontheupstreamseathencethesealingeffectivenessofaHPButterflyValveisthesame.Thediscseatingedgeisasegmentofasphereandcreatesareliable,highpressuresealagainstanun-interrupted360seatsealingsurface.Thediscprofileisverythin&allowsmaximumflowwithalowpressuredrop.ThemostcommonuseoftheSLHBF/SLHBFFSistoshut-offflowinsideapipeline.Everycomponentofthevalveisdesignedtocontributetothisgoal.Thedisc,shaft,bearings,packing&discpinsallworktogethertoensurethatthediscisaccuratelypositionedwhenclosedtoallowtheseattoenergisetothedisc&createaseal.4 SUPERSEAL - Butterfly Valves'