b'DOUBLE OFFSET BUTTERFLY VALVESDOUBLE OFFSET BUTTERFLY VALVESMODEL SLHBF, SLHBFFS 150 TO 1500 CLASS DOUBLE OFFSETFEATURES - DOUBLE OFFSETThe SLHBF Range is based on a unique quarter-turn design. The double offset shaftanddiscconfigurationtogetherwiththeadvancedhightechnologyseatsystemprovidesareliableruggedmulti-purposebutterflyvalverange.Atthepointofthediscopening,thedoubleoffsetdiscprovidesacam-likeaction,thuspreventingexcessiveseatwear&ensuringalongmaintenancefreelife.- Seatremovalispossiblewithoutdisassemblyoftheshaftanddisc.- Bodyinsertprotectsseatfromabrasionanderosion.- Graphoil or PTFE seal-ring & packing.- 2Piecestemforextraflow.ActuatorbracketaccordingtoISO5211,whichallowsreplacementofthestemsealswithoutremovaloftheactuator.PTFE-Seat System - SLHBF/SLHBFFSInthepreferredflow-direction,thePTFE-Seatsystemprovidesoptimumperformance.Inthisdesign,thelinepressureactsasapositiveforceintheseatsystemeveninfluctuatingworkingconditions.Theseatringisretainedbyametalseatretainerandiswellprotectedbythevalve-body,thuspreventingseatdistortion.Bi-directional* - SLHBF/SLHBFFSTheprimaryPTFE-seatringisbackedupbyasecondarymetalring.Thismetalseatprovidesamechanicalloadtoenergizethe PTFE-seat. ThemetalsealingringsecuresandencapsulatesthePTFEringtoensurerigidity.Incombinationwiththe line pressure a Bi-directional* sealing against the line pressure is obtained. * Bi-directionalflow,however,bi-directionalleaktightshutoffmustbespecifiedwithorder.Fire Safe - SLHBFFSThemodelSLHBFFShasasecondarymetalseatwhichgivesbi-directionalsealingintheeventofthePTFEseatinsertbeingburnedawayinafire.Metal to Metal Seat - SLHBF/SLHBFFSHightemperatureserviceandAbrasiveservice.Bi-directionalandinherentlyfiresafedesign.Theprimarymetalsealenablesthisexecutiontobeusedupto670C.Seat-ringsavailablearestainlesssteelANSI316L-chromiumplated,(maximumallowedtemperature:310C)andInconel625(maximumallowedtemperature:760C).AsaresulttheMetaltoMetalrangemeetsthefullpressureandtemperatureratingaccordingtoANSIclassratings.SeatleakagecanbespecifiedtoAPI598(ISO5208LeakageClassA),API6D,FCI70-2ClassVIetc.Upper BushGland Bolt/NutGland FlangeStemPacking GlandPackingDiscLock PinLower BushSeat ASSY.Seat RetainerRetainer BoltsBodyGasket Indicativeexplosiononly,designwillEnd Cover varydependingonsize,class,seatingBolt type,trim,endconnections,etc.Refertoas-builtdrawing.4 SUPERSEAL - Butterfly Valves SUPERSEAL - Butterfly Valves 5'