Transcription
CompactperformanceThreadedSafety Relief ValvesSeries 437Type 437 · 438 · 439Series 459Type 459 · 462CATALOGThe Safety Valve
Series 459Packed lever H4Series 459Balanced bellowsdesignFrontview 462 H4 GG4cFrontview 462 H2 GG SB4cSeries 459Cap H2Series 459Flanged versionFrontview 462 H2 GG4cSeries 459Plain lever H3Frontview 462 H3 GG4c
Threaded Safety Relief Valves Spring LoadedContentsContentsGeneralApplications5Features and Benefits5Codes and Standards5Overview6Series 45933Materials10Materials34How to Order Numbering System Article Numbers Available Connections121415How to Order Numbering System Article Numbers Available Connections404243Dimensions and Weights16Dimensions and Weights44Pressure Temperature Ratings18Pressure Temperature Ratings46Accessories and Options Caps and Levers Metal Seat Soft Seal Heating Jacket20212224Spare Parts25Approvals Series 43727Accessories and Options Caps and Levers Balanced Bellows Metal Seat Soft Seal Heating Jacket Lift Indicator485051525455Capacities Type 43728Spare Parts56Capacities Type 438 / 43930Approvals Series 45958Specification Sheet32Capacities Series 45959Specification Sheet62Series 4379Series 437Cap H2Series 437Packed lifting deviceH4LWN 471.01Series 437Flanged version3
Threaded Safety Relief Valves Spring LoadedGeneralLESER s compact performance valves are spring loadedLESER s compact performance valves are designed andsafety relief valves of specially com-manufactured to highest standards andpact design, developed in close coop-compliant with and approved accord-eration with plant engineers and ser-ing to ASME (Sec. VIII, Div. 1), thevice specialists to protect specialCanadian CRN, the European PEDprocesses and installations againststandard (CE), the German AD 2000-overpressure.Merkblatt A2 and those of many otherExtensive testing at the LESER ASME-countries, covering requirements fromcertified test lab together with up toend-users, OEM s and engineeringdate manufacturing processes ensurecompanies worldwide.the reliability of these state of the artproducts.Type 437 / 438 / 439Type 459 / 4624LWN 471.02
Threaded Safety Relief Valves Spring LoadedApplications · Features and Benefits · Codes and StandardsApplicationsFeatures and BenefitsCodes and StandardsLESER s compact performance valvesrepresent the ultimate solution for critical applications such asLESER s compact performance valvescover a large variety of types, materialsand options to fit any application:Scope of Design Four valve sizes from 1/2” through11/2” Four orifice sizes from 0.3*D through F Threaded or flanged connectionsANSI or DIN, Inlet rating: class 150#to 2500# Standard metal sealing: Type 437 andType 459 or Soft seal: Type 438, 439 and 462 Optional stainless steel bellows forback pressure compensation Packed or plain lifting lever orgastight cap Heating jacket available for high viscosity fluidsLESER s compact performance valvescomply with the following codes andstandards: Air/gas compressors and pumpsTechnical gases and CO2 plantsChemical equipment and pipingPressure vessels and piping systemscontaining gas, air, liquid or steamLPG/LNG terminals, carriers etc.Cryogenic systems and oxygenapplicationThermal relief ASME Section VIII – National Boardcertified capacities (single trim forsteam, gas and liquid service): UVstampASME Section II - materialsASME B 16.34 and ASME B16.5API 527, NACE MR 0175CRNEN ISO 4126-1PED 97 / 23 / EC (CE-marking),VdTUEV-SV 100,AD 2000-Merkblatt A2OthersCompact design and High Performance Single trim for steam, gas and liquidfor less spare parts and easier maintenance Broad set pressure range up to11600 psig Self-draining body design, avoidsresidues and reduces corrosion One-piece spindle reduces friction Unobstructed seat bore for maximum capacity compared to nominalsize Heavy duty design Type 459M Various materials: chrome steel, stainless steel, Monel ‚ or Hastelloy All parts machined from bar stockfor complete valves from specialmaterials within short time Variety of capacities and versions,multiple choice of connections to fitany applicationEase of plant design, installation,operation and maintenance Replaceable nozzle and disc Hardened or optional stellited metalsealing for longer product life Soft seat for superior tightness Ringless design, no adjustmentsLWN 471.035
Threaded Safety Relief Valves Spring LoadedGeneral · OverviewOverviewSeries 437 Series 459Type 437: Metal to metal seatType 438: Soft seal, o-ringType 439: Soft seal, vulcanizedCommon Features Very compact design Medium capacity Two standard body materials:chrome steel, stainless steel All parts machined from bar stock –various material options available Various connections Type 459: Metal to metal seatType 462: Soft seal, o-ringCommon Features Compact design High capacity compared to nominalsizes: for most common valve size3/4” x 1” up to 1.5 D-orifice capacity* Four different orifice sizes available Wide range of set pressures Optional balanced bellows Three body materials: cast iron, carbon steel, stainless steel Various connectionsThe diagram gives a quick overviewabout the main features of LESER’scompact performance valves: capacityand tightness.TightnessSeries 437Series 459Type 439 Vulcanizedsoft sealType 438 O-ring discType 437 Sealing plateType 462 O-ring discType 459 Sealing plateType 437 Metal to metalType 459 Metal to metalCapacity /OrificeSelection of Threaded Safety Relief ValvesCriteriaSeriesTypeSet Pressure 2700psig 6000psigHigh Flow Capacityis required D Orifice F OrificeThermal Expansion applicationSoft SeatsMetal SeatsTemperature 536 FTemperature -50 FVariable Back Pressure occursThreaded Connections are requiredFlanged Connections are requiredNote:61437437–––– –1 – – FlangedSRV459438–––– 439–––– –––– –––– 459 462 e.g. 526 – –––1 –– – ––– – – Disc with sealing plate (e.g. PTFE) is available.LWN 471.04
Threaded Safety Relief Valves Spring LoadedGeneral · OverviewMetal to metal seatType 437 and 459 provide for the protection of installations where the metalto metal seat with its wide temperaturerange and good chemical resistance issuitable.SetPressure[psig]Type 437 and 459 can be equippedwith an optional sealing plate disc forlow temperature soft seat applications.4590.044inch24590.099 inch2437LongVersion0.122 inch2437StandardVersion0.122 inch24590.206 inch24590.373 inch2Capacity /OrificeMetal to metal seatType 437CapacitySet pressureSealingDesignLWN 471.05Orifice 0.5*Dup to 2610 psigmetal to metalvery compactType 459CapacitySet pressureSealingDesignOrifice 0.3*D through Fup to 11600 psigmetal to metalcompact,optional bellows,heavy duty design 459MSchnitt 459 H2 male4c7
Threaded Safety Relief Valves Spring LoadedGeneral · OverviewSoft sealType 438, 439 and 462 provide for theprotection of installations where a softseat for superior tightness is requiredlike for hard to hold gases.SetPressure[psig]Type 439 allows maintained tightnessclose to the set pressure especially atlower set pressures due to the advanced design of the vulcanized soft seat.4620.099 inch2438Long Version0.122 inch2438StandardVersion0.122 inch24620.206 inch24620.373 inch2439 0.122 inch2Capacity/OrificeSoft sealType 438CapacitySet pressureSealingDesign8Orifice 0.5*Dup to 2610 psigsoft seal, O-ringvery compactType 439CapacitySet pressureSealingDesignOrifice 0.5*Dup to 232 psigvulcanized soft sealvery compactType 462CapacitySchnitt 439 H2 3 4x1 male4cSet pressureSealingDesignOrifice 0.75*Dthrough Fup to 5075 psigsoft seal, O-ringcompact,optional bellowsSchnitt 462 H2 male4cLWN 471.06
Threaded Safety Relief Valves Spring LoadedSeries 437Series 437Type 437 / 438 / 439Type 437 / 438 / 439Flanged VersionLWN 471.079
Series437Threaded Safety Relief Valves Spring LoadedMaterials Type 437Materials Type 437ItemPart Name40Type 4373Chrome SteelType 4374Stainless SteelSA 479 316LSA 479 316L12Inlet bodyOutlet bodySA 479 316LSA 479 4307Disc1216 / 17SpindleSpring plateHardenedstainless steelAISI 420AISI 430F1819405457Adjusting screwwith bushingLock nutCap H2SpringPinAISI 430FPTFESteelSteelStainless steelStainless steel316LPTFE316L316LStainless steelStainless steel61BallHardenedstainless steel31618191612316L54316L316L217576171Flanged Version122.12.248Inlet bodyOutlet bodyOutlet adaptorOutlet flangeInlet flangeSA 479 316LSA 479 430316L316L316LSA 479 316LSA 479 316L316L316L316LType 437401819162.22.1125421757617148Type 437Flanged version10LWN 471.08
Threaded Safety Relief Valves Spring LoadedMaterials Type 438 · Type 439Materials Type 438 · Type 43940ItemPart NameType 4383Type 4393Chrome SteelType 4384Type 4394Stainless Steel12Inlet bodyOutlet bodySA 479 316LSA 479 430SA 479 316LSA 479 316L197Disc withsoft seal 1SpindleSpring plate316L316L16AISI 420AISI 430F316L316L1218Adjusting screwwith bushingAISI 430FPTFE316LPTFE5419405457Lock nutCap H2SpringPinSteelSteelStainless steelStainless steel316L316LStainless steelStainless steel61BallHardenedstainless steel3161216 / 17218271Flanged Version122.12.248Notes:Inlet bodyOutlet bodyOutlet adaptorOutlet flangeInlet flangeCRNBREPDMFPMFFKM12––––––SA 479 316LSA 479 430316L316L316LSA 479 316LSA 479 316L316L316L316LType 438O-ring sealNeopreneNitrileEthylene / PropyleneFluorocarbonKalrez (Type 438)ISOLAST (Type 439)Schnitt 438 H2 3 4x1 male4c4018Item 17 only Type 439162.22.1125422177571614871Type 439Vulcanized soft sealType 438Flanged versionLWN 471.0911Schnitt 438 H2 Flansch
Series437Threaded Safety Relief Valves Spring LoadedHow to Order – Numbering SystemHow to OrderNumbering System1Article Number123Set PressurePlease state unit (in gauge)!4Please do not exceed pressure rangementioned in the spring charts.437 4 . 314 2123ConnectionsPlease refer to table “AvailableConnections” on page 15.Please state one option code for each,inlet and outlet.Type 437 / 438 / 439TypeTypes of sealing437Metal seatMetal-to-metalMetal-to-metal stellitedSoft seatEPDMNBRCRFFKM(Kalrez )FKM(Viton )Plastic seatSPPCTFEPTDE-FDA12Vespel-SP1Kel-FTeflon438439 2Material Code3 – Body Material Chrome Steel4 – Body Material Stainless Steel3Valve CodeIdentifies valve size,body material and orifice,refer to page 14.4Code for lifting device2 – Screwed capH24 – Packed leverH44374.3142100 psigArticle No.Set PressureV62V71ConnectionsLWN 471.10
Threaded Safety Relief Valves Spring LoadedHow to Order – Numbering System4OptionsType 437 / 438 / 439OptionCode Inlet body stellited(Type 437 only) Soft seal material(Type 438 / 439 only)NBREPDMCRFKMFFKM Heating J21J23J20Documentation6Code and MediumPlease select requested documentation:1Material test certificateDIN EN 10204-3.1PartsInlet bodyOutlet bodyBonnetCap / lever coverDiscOption CodeH 01L 34L 30L 31L 23H29H01OptionsLWN 471.11L20521 . 11Code1. ASME Section VIII2. CE / VdTUEV3. ASME Section VIII CE / VdTUEV2Medium.1 Gases.2 Liquids.3 Steam.0 Steam / Gases / Liquids(valid only for CE /VdTUEV)L301.1DocumentationCode and Medium13
Series437Threaded Safety Relief Valves Spring LoadedHow to order · Article NumbersHow to orderArticle Numbers Type 437TypeOrifice[Inch2 ]Type 437standard versionBody MaterialChrome Steel SA 479 430Body MaterialStainless Steel SA 479 316LSet PressureRange [psig]CapH2Packed LeverH4Set PressureRange [psig]CapH2Packed LeverH41.5 - 13484373.26024373.26041.5 - 9864374.31424374.31441349 - 26104373.26124373.2614987 - 26104374.31524374.31540.122Type 437long version 1Article Numbers Type 438TypeOrifice[Inch2 ]Body MaterialChrome Steel SA479 430Body MaterialStainless Steel SA 479 316LSet PressureRange [psig]CapH2Packed LeverH4Set PressureRange [psig]CapH2Packed LeverH47 - 13484383.28624383.28647 - 9864384.29824384.29841349 - 26104383.28724383.2874987 - 26104384.29924384.2994Type 438standard version0.122Type 438long version1Article Numbers Type 439TypeOrifice[Inch2 ]Type 439standard version0.122Note:141Body MaterialChrome Steel SA479 430Body MaterialStainless Steel SA 479 316LSet PressureRange [psig]CapH2Packed LeverH4Set PressureRange [psig]CapH2Packed LeverH41.5 - 2324393.28824393.28841.5 - 2324394.28924394.2894The “long version” is a high pressure version with extended outlet body.LWN 471.12
Threaded Safety Relief Valves Spring LoadedHow to Order · Available ConnectionsAvailable Connections – Threaded ASME ANSI B1.20.1InletSizeMale NPTOption CodeOutletFemale NPTOption CodeSizeFemale NPTSizeOption 1”V601”V71/2”/2”/2”Male threadAvailable Connections – Flanged ASME ANSI V08V09–150–V18300600V10300600 1V199001500V11900 2V202500V12––1/2”3/4”1”Female threadMaximum inlet flange class: #1500Extended center to face dimension outlet: 4 3/4” (120 mm)Different sizes and flange classes inletand outlet can be combined.Standard flange facing is raised face(RF) according to ASME ANSI B16.5.RJ flange facing as well as other facingsare available.Flanged versionLWN 471.1315
Series437Threaded Safety Relief Valves Spring LoadedDimensions and Weights Threaded / Flanged Connections US UnitsassbMale threadFemale threadFlanged versionDimensions and Weights Threaded Connections US UnitsCenter to Face[Inch]ConnectionSize[Inch]Orifice[Inch2 ]Male11/2” x /2”1 ”x 3 ”/2/43 ”x 3 ”/4/43 ” x 1”/40.1221” x dLongVersionFemaleab33Hmax.8 35/648 35/648 35/648 21/328 13/16Hmax.19 3/89 3/89 3/89 31/649 41/641 /41 3/41 3/41 53/641 53/64/6455/6455/6455/641 7/167/167/16m3.5only Type 437 / 438Dimensions and Weights Flanged Connections US UnitsCenter to Face[Inch]ConnectionSize[Inch]Orifice[Inch2 ]Class150inletaoutletb1/2”3 ”/41216only Type 437 / 438for 1/2” ANSI 150: 3s110.1221”Notes:Flange Thickness[Inch]431/642 3 15/16/1611/163/4Height[Inch]Weight[lbs]Class300 ax.Hmax.1m111 5/161 1/41 9/161 7/161 9/161 5/810 7/161715.511 /811/6415/16LWN 471.14
Threaded Safety Relief Valves Spring LoadedDimensions and Weights Threaded / Flanged Connections Metric UnitsDimensions and Weights Threaded Connections Metric UnitsCenter to Face[mm]ConnectionSize[Inch]Orifice[mm2 ]InletMale11/2” x /2”1/2” x 3/4”3 ”x 3 ”/4/43 ” x 1”/478.51” x 62192181.6only Type 437 / 438Dimensions and Weights Flanged Connections Metric UnitsCenter to Face[mm]ConnectionSize[Inch]Orifice[mm2 otes:12Flange Thickness[mm]Height[mm]Weight[kg]Class900 /1500sClass2500StandardLongVersionsClass300 nly Type 437 / 438for 1/2” ANSI 150: 100 mmLWN 471.1517
Series437Threaded Safety Relief Valves Spring LoadedPressure Temperature Ratings Type 437 / 438 / 439 US UnitsPressure Temperature Ratings Type 437 – US Units1ValveSizeOrifice[Inch2 ]Set Pressure Range[psig]Body MaterialStandard VersionLong VersionTemperature Rangeaccording toASME [ F]min.max.min.max.min.max./2” – 1”0.122Chrome Steel1.5134813492610- 20 428/2” – 1”0.122Stainless Steel1.59869872610- 450 53611Pressure Temperature Ratings Type 438 – US Units1ValveSizeOrifice[Inch2 ]Set Pressure Range[psig]Body MaterialStandard VersionLong VersionTemperature Rangeaccording toASME [ F ]2min.max.min.max.min.max./2” – 1”0.122Chrome Steel15134813492610- 20 356/2” – 1”0.122Stainless Steel159869872610- 49 35611Pressure Temperature Ratings Type 439 – US Units1ValveSize218Standard Versionmin.max.min.max.0.122Chrome Steel1.5232- 20 356/2” – 1”0.122Stainless Steel1.5232- 49 35611Body MaterialTemperature Rangeaccording toASME [ F ]2/2” – 1”1Notes:Orifice[Inch2 ]Set Pressure Range[psig]For flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limitsThe temperature is limited by the soft seal material, please refer to soft seal selection table on page 23.LWN 471.16
Threaded Safety Relief Valves Spring LoadedPressure Temperature Ratings Type 437 / 438 / 439 Metric UnitsPressure Temperature Ratings Type 437 – Metric Units1ValveSizeOrifice[mm 2 ]Set Pressure Range[bar]Body MaterialStandard VersionLong VersionTemperature Rangeaccording toASME [ C]min.max.min.max.min.max./2” – 1”78.5Chrome Steel0.19393180- 29 220/2” – 1”78.5Stainless Steel0.16868180- 268 28011Pressure Temperature Ratings Type 438 – Metric Units1ValveSizeOrifice[mm 2 ]Set Pressure Range[bar]Body MaterialStandard VersionLong VersionTemperature Rangeaccording toASME [ C]2min.max.min.max.min.max./2” – 1”78.5Chrome Steel19393180- 29 180/2” – 1”78.5Stainless Steel16868180- 45 18011Pressure Temperature Ratings Type 439 – Metric Units1ValveSize2Standard Versionmin.max.min.max.78.5Chrome Steel0.116- 29 180/2” – 1”78.5Stainless Steel0.116- 45 18011Body MaterialTemperature Rangeaccording toASME [ C]2/2” – 1”1Notes:Orifice[mm 2 ]Set Pressure Range[bar]For flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits.The temperature is limited by the soft seal material, please refer to soft seal selection table on page 23.LWN 471.1719
Series437Threaded Safety Relief Valves Spring LoadedAccessories and Options · Caps and LeversAccessories and OptionsCaps and LeversSeries 437 is available with the following lever designs Materials – subassembly Item 40Body MaterialChrome SteelCap H2Packed lever H4, threaded designThe packed lever H4 provides somespecial features: operation by turning the knob anticlock wise remains in open position until theknob is screwed down again open and closed position is indicatedItem122121314161922232425ComponentLever coverCapKnobSpindle capBoltSupport ringPinO-ringStopperSealSeal wireSealing noseCap ked lever H4AISI 430F–AISI 430FAISI 420316SS316SSStainless SteelVitonAISI 430FPlastic316SS316LBody MaterialStainless SteelCap ed lever H4316L–316L316L316SS316SSStainless 32425232423ClosedCap H220Packed lever H4LWN 471.18
Threaded Safety Relief Valves Spring LoadedAccessories and Options · Metal SeatMetal Seat (Type 437)The LESER metal seats (disc and nozzle)are lapped to optical flatness to ensurea tight shut off. LESER safety reliefvalves are supplied with a standardleak tightness according to API 527.Type 4373Standard material for the disc is a hardened stainless steel. The combinationof a hard disc material and a softer seatmaterial (316L) provides for improvedwear resistance and longer product life.Type 4374Disc and seat are provided in 316Lmaterial for highest corrosion resistance.Any other material which is availablefrom bar stock can be supplied as well(e.g. Hastelloy , Monel , Alloy20, ).57577.37.37.17.17.27.211Metal seatStellited sealing surfacesDisc Materials subassembly Item 7ItemPart NameType 4373Body MaterialChrome SteelType 4374Body MaterialStainless Steel7.1DiscHardenedstainless steelHardness 40 – 50 HRC316L7.27.357Lifting aidNutPinAISI 430FSteel316316L316L316ItemPart NameOptional stellited sealing surfaces7.1Disc316L stellitedHardness 40 – 45 HRC1Inlet Body316L stellitedHardness 40 – 45 HRCLWN 471.19Stellited sealing surfacesFor high temperature applications, orapplications with abrasive fluids wearresistant sealing surfaces are recommended.The sealing surfaces of the disc, seator nozzle can be stellited by build-upwelding. The minimum thickness of thestellite is 0.06 inch.In addition to the corrosion resistance,the stellited surface also offers a highresistance to impact and suddenchanges in temperature.21
Series437Threaded Safety Relief Valves Spring LoadedAccessories and Options · Soft SealSoft SealO-ring disc(Type 438)Vulcanized soft seal(Type 439)Disc with sealing plate (Type 437, optional)57Codeletter .3O-ring disc Type 438Vulcanized soft seal disc Type 439Disc with sealing plate Type 437ApplicationType 437, 438 and 439 are providedwith a soft seal disc for superior tightness maintained tightness close to theset pressureDisc with vulcanized soft sealType 439 with a vulcanized soft seatallows maintained tightness close tothe set pressure especially at lower setpressures.Disc with sealing plateFor applications, where the increasedtightness of a soft seal is required butthe temperature is too low or too highfor an o-ring-disc, e.g. liquefied gases.Note:Features and Benefits three different designs for extendedapplication range minimized leakage and product loss large selection of soft seal materials simple replacement of soft seal standard ARP o-ring sizes one standard durometer per o-ringmaterial reduced maintenance costsCode letter: Please refer to soft sealselection table1For temperature limits and mediumresistance refer to the soft seal selection table.Materials – subassembly Item 7Type 438 O-ring discItem22Type 439 Vulcanized soft seal discType 437 Disc with sealing platePart NameMaterialPart NameMaterialPart NameMaterial7.1Disc316LDisc316L withvulcanized soft seal,refer to soft sealselection tableDisc316L7.2Lifting aid316LLifting aid316LLifting aid7.3O-ring57PinRefer to soft sealselection table–Nut316LSealing platePin316Pin316LRefer to soft sealselection table316LWN 471.20
Threaded Safety Relief Valves Spring LoadedAccessories and Options · Soft SealType 437 Sealing plate Type 438 O-ring, Type 439 Vulcanized soft sealSoft Seal SelectionAbbrevationASTM1418DesignationTrade nameCRNeoprene (Chloroprene)KNBRBuna - N (Nitrile-Butadiene)EPDMTminCode- Optionletter1 CodeTmaxApplication 2[ F][ C][ F][ C]J21-40-40212100Paraffin oil, silicone oil and grease, water andwaterbased solvents, refrigerants, ozoneNJ30-13-25230110Hydraulic oil, vegetable and animal greaseand oilBuna - EP (Ethylene-Propylene Diene)DJ22-49-45302150Hot water and superheated steam up to 302 F,several organic and inorganic acids,silicone oil and grease, FDA compliantFPM(FKM)Viton (Fluorocarbon)LJ23-4-20356180For high temperature service (no superheated steam),mineral oil and grease, silicone oil and grease, vegetable and animal grease and oil, ozone, FDA compliantcompound available on requestFFKM3Kalrez (Perfluoro)CJ20320482250Nearly all chemicals, standard compound isKalrez 6375 with steam resistance, FDA compliantcompound available on requestSPVESPEL SP-1 (Polyimide)TJ49-454-270572300High temperature and high pressure applications(no steam), for chemical resistance refer tomanufacturers guidePCTFEKel-F ogenic and refrigeration application,flammable media, gaseous oxygene applicationup to 725 psig at 140 ºFPTFETeflon (Polytetrafluoroethylene)AJ44-300-184302150Nearly all chemicalsOtherNotes:123Please contact LESER LLCThe code letters will be stamped on the disc. For soft seal materials other than listed the code letter X will be used.Pressure and temperature service must be considered in any case.For type 439: material is ISOLAST .Set Pressure LimitsSealing plate discPressure Rangemin.MaterialRegistered Trademarksmax.[psig][bar][psig][bar]VESPELSP-1 150102610180Kel-F 1.50.12610180Teflon LWN 471.211.50.114510Buna-N , Teflon ,Viton , VESPEL SP-1 ,Neoprene , Kalrez Buna EP Kel-F ISOLAST CompanyDuPontBayer3MBusak Shamban23
Series437Threaded Safety Relief Valves Spring LoadedAccessories and Options · Heating JacketHeating Jacket (Type 437)ApplicationPressure relief valves in systems to beprotected from media which are viscous, sticky or have a tendency tocrystallize out of solution can be fittedwith a heating jacket.For type 437 the outlet body is fittedwith a fabricated heating jacket. Theposition of the heating connections isshown in figure 1.Specifications of the heating jacketThe operating data for the heating jacketare shown on a separate name ax260 psig410 FAvailable heating connectionsConnectionOption CodeCouplings FNPTS02 H29Type 437 with heating jacket24LWN 471.22
Threaded Safety Relief Valves Spring LoadedSpare Parts · Discs · O-ringSpare PartsDiscs – Type 437 metal to metal seat (Item 7)ValveSizeOrifice[Inch2 ]Type 4373Hardenedstainless steelType 4374Stainless Steel316Lall0.122200.8739.9000200.8749.9000Discs – Type 438 soft seal with o-ring, disc material: 316L (Item 7)ValveSizeOrifice[Inch2 ing sizeARP-no.7/16 x 3/32ARP 1117/16 x 3/32ARP 111CRNeopreneEPDMEthyleneFPM (FKM)VitonNBRNitrileFFKMKalrez thyleneFPM (FKM)VitonNBRNitrileFFKMKalrez 07.2681502.0107.2691O-ring – Type 438 soft seal (Item 7.3)ValveSizeOrifice[Inch2 ]all0.122O-ring sizeARP-no.7/16 x 3/32ARP 111Discs – Type 439 with vulcanized soft seal (Item 7)ValveSizeOrifice[Inch2 ]all0.122LWN 471.23CRNeopreneEPDMEthyleneFPM (FKM)VitonNBRNitrileFFKMISOLAST 49.9081200.9049.909125
Series437Threaded Safety Relief Valves Spring LoadedSpare Parts · Inlet BodiesInlet Bodies Types 437 Threaded connections – Material 316L (Item 1)Male NPTFemale NPTSizeOrifice[Inch2 ]Part Number10.1223/4”1”/2”SizeOrifice[Inch2 ]Part ��0.122136.5849.9211/2”Inlet Bodies Types 438 / 439 Threaded connections – Material 316L (Item 1)Male NPTSizeOrifice[Inch2 ]Part Number10.1223/4”1”/2”26Female NPTSizeOrifice[Inch2 ]Part ��0.122136.6849.9211/2”LWN 471.24
Threaded Safety Relief Valves Spring LoadedApprovals Series 437 · Rated slopeApprovals Series 437Coefficient of Discharge 1CountryTypeFluidApproval No.437S/GLS/GL0.122438 / 58UnitedStatesASME Sec. VIIICanadaCRN437 / 438 / 439S/G/LOG0772.9C0.122Refer to ASME Sec. VIIICountryCodeTypeFluidApproval No.OrificeCertified Coefficient of DischargeK drEuropePED 97 / 23 / 500.350.400.33437438 / 439αw437GermanyAD 2000Merkblatt A2OthersNotes:1438 / 439S/GLS/GLChina:Russia:CSBQTSDIN GOSTShip classification authorities:BV, DNV, GL, LROS, RINATUEV-SV 9800.1220.500.350.400.33Acc. to ASME Sec. VIII the certified coefficient of discharge K is calculated by K 0.9 * KDFor sizing acc. to ASME Sec. VIII K must be used in the sizing equations.Rated slopeWithin the capacity certification according to ASME Sec. VIII the coefficientsof discharge for series 437 are issued as“rated slope values” instead of K values.LWN 471.25Rated slope values can be convertedinto K values. The table above showsthe converted K values. The originalrated slope values are listed below.FluidRated slope Type 437Rated slope Type 438 /439S2.86 lb / hr / PSIA2.55 lb / hr / PSIAG1.02 SCFM / PSIA0.904 SCFM / PSIAL1.54 GPM PSID1.49 GPM / PSID27
Series437Threaded Safety Relief Valves Spring LoadedCapacities US Units · STEAM · AIR · WATERType 437STEAMAIRWATERASME Section VIII[lb/ hr]ASME Section VIII[S.C.F.M.]ASME Section VIII[US - G.P.M.]Capacities US UnitsCapacities US UnitsSet pressure[psig]Orifice0.122 Inch2Set pressure[psig]Orifice0.122 Inch2Set pressure[psig]Orifice0.122 551.153.656.058.360.562.672.380.8Capacities for saturated steam according to ASME Section VIII (UV), based onset pressure plus 10 % overpressure.Capacities at 30 psig and bellow arebased on 3 psig overpressure.28Capacities US UnitsCapacities for air according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 60 F.Capacities at 30 psig and below arebased on 3 psig overpressure.Capacities for water according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 68 F.Capacities at 30 psig and below arebased on 3 psig overpressure.LWN 471.26
Threaded Safety Relief Valves Spring LoadedCapacities Metric Units · STEAM · AIR · WATERType 437STEAMAIRWATERASME Section VIII[kg / hr]ASME Section VIII[Sm3/ hr]ASME Section VIII[103 kg/ hr]Capacities Metric UnitsCapacities Metric UnitsCapacities Metric UnitsSet pressure[bar]Orifice78.5 mm2Set pressure[bar]Orifice78.5 mm2Set pressure[bar]Orifice78.5 5.916.517.117.718.2
compact performance valves: capacity and tightness. LWN 471.04 Threaded Safety Relief Valves Spring Loaded General · Overview 6 Overview Tightness Capacity / Orifice Type 439 Vulcanized soft seal Type 438 O-ring disc Type 437 Sealing plate Type 437 Metal to metal Type 462 O-ring disc Type 459 Sealing plate Type 459 Metal to metal Series 437 .
