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CompactPerformanceSafety Relief ValvesSeries 437Series 459EXTENDED CATALOGThe-Safety-Valve.com

High operating to setpressure ratio, high backpressureor low total ServiceMediumcontrolledValve FinderHow to find the right Product GroupNoClean Serviceapplication?Critical Service / highly corrosiveapplication?NoYesAPINoSteam, gas and liquid applicationwith low capacity in relationto valve size?YesModulateActionSpring loadedAPI specifiedapplication?Safety Relief ValvesNoNoOrifice FHighPerformanceRequiredOrifice ingdiscAdditional componentsbeyond safety valvesChangeover valveOrifice F

GeneralContentsCompact PerformanceGeneral information4Type 45941Designs42Materials4344Type 4377Article numbersDesigns8Dimensions and weightsMaterials9 Threaded connections4510 Flanged connections47Article numbersDimensions and weights Threaded connections11 Flanged connections13Pressure / temperature ratings49Approvals51Pressure / temperature ratings15Type 459 HDD52Approvals16Designs53Materials5417Article numbers55Designs18Dimensions and weightsMaterials19 Threaded connections56Article numbers20 Flanged connections58Type 438Dimensions and weights Threaded connections21 Flanged connections23Pressure / temperature ratings60Approvals61Pressure / temperature ratings25Type 46262Approvals26Designs63Materials6465Type 43927Article numbersDesigns28Dimensions and weightsMaterials29 Threaded connections66Article numbers30 Flanged connections68Dimensions and weights Threaded connections31 Flanged connections33Pressure / temperature ratings70Approvals72Pressure / temperature ratings35Type 462 HDD73Approvals36Designs74Materials75Article numbers76Series 43737Available options37, 113Available connectionsDimensions and weights Threaded connections77Flanged connections79 Threaded connections38 Flanged connections39Pressure / temperature ratings81Spare parts90Approvals82Capacities93Series 45983Available options83, 122Available connections Threaded connections84 Flanged connections85LESER Original Spare Parts Kits86Capacities101Type 437Type 437Type 437Type 459Type 459Type 459Packed knob H4Packed knob H4Long versionPull button H3Cap H2Plain lever H3Cap H2Balanced bellows design3

GeneralGeneral InformationThe Compact Performance product group stands for compact dimensions with high capacity relative great variety of threaded and flanged connections wide pressure rangeLESER Compact Performance Safety Valves are designed to meet all industrial applications up to F orificeopen rapidly with an overpressure of max. 5 % (Series 459)resp. 10 % (Series 437) to the full design lifthave a maximum blowdown of minus 10 % for steam/gasservice and minus 20 % for liquid serviceare developed in a close cooperation with plant engineersand service specialistsserve for protection of processes and equipmentare approved by all important approval organisationsworldwide which ensures the worldwide applicability,for example:European Community: CE-marking according to thePressure Equipment Directive (PED) 2014/68/EU andEN ISO 4126-1 USA: UV-stamp according to ASME Section VIIIDivision 1, National Board certified capacities Germany: VdTÜV approval according to PED,EN ISO 4126-1, TÜV SV 100 and AD 2000-Merkblatt A2 Canada: Canadian Registration Number accordingto the requirements of particular provinces China: AQSIQ based on the approval according toASME Section VIII Division 1 and AD 2000-Merkblatt A2 Eurasian Custom Union: Approval acc. to EurasianCustom Union (EAC - Eurasian Conformity) Furthermore, all LESER Compact Performance Safety Valvesare designed, marked, produced and approved accordingto the requirements of the following regulations (directives,codes, rules and standards):EN ISO 4126-7, EN 12266-1/-2, EN 1092 Part I and II flanging, ASME PTC 25, ASME-Code Sec. II, ASME B 16.34,ASME B16.5 flanging, API Std. 527, API RP 576,AD 2000-Merkblatt A4, AD 2000-Merkblatt HP0.UV4

GeneralGeneral InformationApplicationsGeneral Design FeaturesLESER Compact Performance Safety Valves offer ultimateprotection against unallowable overpressures in all applications for steam, gases and liquids where smaller capacitiesare required.LESER Compact Performance Safety Valves cover a largevariety of types, materials and options to fit any application: Typical applications for LESER Compact PerformanceSafety Valves are:air/gas compressors and pumpstechnical gases and CO2 plants cylinder filling stations chemical equipment and piping pressure vessels and piping systems containing gas,air, liquid or steam LPG / LNG terminals, carriers etc. cryogenic systems and oxygen applications thermal relief high pressure extraction plants connection sizes from 3/8" to 1 1/2" and 5 orifices(D through F) provide high suitability to the applicationThreaded connections, male and female, according toall international standards guarantee worldwide applicabilityFlanged connections according ANSI, DIN and JISguarantee a worldwide applicabilityInlet pressure ratings up to PN 850 to fit all required designpressures2 standard based / inlet body materials, Chrome steel andstainless steel as well as 3 standard body materials, ductileiron, steel and stainless steel can be selected according tothe applicationAll parts can be machined from bar materials to coverspecial material requirements such as Hastelloy , Duplex,Super Duplex, Tantalum or Titanium withinunrivalled lead timeSet pressures from 0.1 to 850 bar / 1.5 to 12325 psigmake Compact Performance safety valves suitable for allindustrial processesOperating temperatures from -273 C bis 450 C / -454 Fto 1022 F (acc. to DIN EN) cover a wide range of applicationsLESER Nanotightness as standard for metal-to-metal sealings. The nanotightness exceeds the requirements for functional tightness of API 527 by 50% which means e.g. lesspollution when discharge to atmosphere, 50% reduction inmedium loss and increased plant efficiencyOne design and spring (single trim) for steam, gas andliquid applications reduces the number of spare partsand ensures low cost maintenance managementRingless design needs no trim adjustments for easymaintenanceOne-piece spindle reduces friction which leads to highoperation accuracySelf-draining body design, avoids residues and reducescorrosionOptions Special connections specified by the customer foroptimised adaptation to the plantStellited or hardened metal sealing for longer product lifeSoft seat solutions for superior tightnessStainless steel bellows for back pressure compensationHeating jackets for applications with high viscosity fluidsBase / inlet body, body, bonnet and all internal parts canbe produced in special materials exactly to meet customerspecification requirements5

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Type 437Type 437Packed knob H4Conventional designType 437Safety Relief ValvesContentsType 437Packed knob H4Flanged connectionPageDesigns8Materials9Article numbers10Dimensions and weights Threaded connections11 Flanged connections13Pressure / temperature ratings15Approvals16Type 437Cap H2Long version7

Type 437Type 437Designs40Cap H218Adjusting screwwith bushingLock nut1916Spring plate12Spindle54Spring2Outlet body17Spring plate57Pin61Ball7Disc1BodyAxial needlebeering69Conventional designThreaded connectionOutlet flange2.4Outlet adaptor2.1Inlet flange48Long versionThreaded connectionConventional designFlange connection8

Type 437Type Base/Inlet bodyFlange connectionLong version2Outlet body2.1Outlet adaptorFlange connection2.4Outlet flangeFlange connection7DiscLong version12Spindle3)Long Version16/17Spring plate3)Long version18Adjusting screwwith bushing19Lock nut40Cap H248Inlet flange54Spring57Pin61Ball69Axial needle beeringFlange connectionLong versionType 43731.41041) 4), 1.4404SA 479 4301) 4), SA 479 316L1.4404SA 479 316L1.41042), 1.4404 stellitedSA 479 4302) , SA 479 316L stellited1.41044)SA 479 4304)1.4404316L1.4404316L1.4122Hardened stainless steeld0 6: 1.4404 stellited d0 10: 1.4122d0 6: 316L stellitedd0 10: HSS5)1.40214201.4404316L1.4104Chrome steel1.4404316L1.4104 / PTFEChrome steel / PTFE1.0718steel1.0460SA 1051.4404316L1.4310Stainless steel1.4310Stainless steel1.3541Hardened stainless steel1.4404316LType 43741.4404SA 479 316L1.4404SA 479 316L1.4404 stellitedSA 479 316L stellited1.4404SA 479 316L1.4404316L1.4404316L1.4404SA 316Ld0 6: 1.4404 stellited d0 10: 1.4404d0 6: 316L stellitedd0 10: 316L1.4404316L1.4404316L1.4404316L1.4404316L1.4104 / PTFE1.4104 / PTFE1.4404316L1.4404316L1.4404316L1.4310Stainless steel1.4310Stainless steel1.44013161.4404316LPlease notice: Modifications reserved by LESER. LESER can upgrade materials without notice. Every part can be replaced by other material acc. to customer specification. The materials shall meet the requirements of the relevant regulations (Pressure Equipment Directive (PED), acc. to PED applied harmonized standards, AD2000-Merkblätter, VdTÜV (Werkstoffblätter) as well as further materials listed in Section 8 of the Type-Examination.1)2)3)4)5)Only for male thread DIN ISO 228-1 G3/8, G1/2, G3/4 (Option Codes V49, V54, V55).Only for d0 10 with male thread DIN ISO 228-1 G3/8, G1/2, G3/4 (Option Codes V49, V54, V55).The items 12 and 17 are combined to one unit.Material 1.4404/316L for ASME application (Option code N68 or N70)Hardened stainless steel9

Type 437Type 437Article numbersMetal seatLong versionConventional designActual Orifice diameter d0 [mm]10610Actual Orifice area A0 [mm2]78.528.378.5Actual Orifice diameter d0 [inch]0.3940.2360.394Actual Orifice area A0 [inch2]0.1220.0440.122Art. No. 4373.2)260226222612H3Art. No. 4373.2)pmax. 16 barg2603––Art. No. 4373.2)260426242614Base / Inlet body material: 1.4104 (430)1)H2H4p [barg]S/G/L 0.1 – 93S/G 180 – 365S/G/L 93 –180p [psig]S/G/L 1.5 – 1349S/G 2611 – 5294S/G/L 1349 – 2611Base / Inlet body material: 1.4404 (316L)1)2)H2Art. No. 4374.314231223152H4Art. No. 4374.314431243154p [barg]S/G/L 0.1 – 68S/G 180 – 330S/G/L 68 –180p [psig]S/G/L 1.5 – 986S/G 2611 – 4786S/G/L 986 – 2611Material 1.4404/316L for ASME application (Option code N68 or N70).Type 4373 should not be selected when a „stainless steel“ valve is required due to corrosive medium.10

Size Outlet bodyActual Orifice diameter d0 [mm]Actual Orifice area A0 [mm2]WeightRequired installation diameter d[kg][mm]Conventional design3/ "1"41078.51078.51078.5628.3628.3Long version1/ ntional design3/ "1"41/ "23/ "4Long version1/ "1"21/ "21/ "23/ "41.465Type 437Type 437Dimensions and weightsThreaded connections [Metric units]3/4"1078.51"1078.52.1802.1803/1"Inlet thread femaleSize outlet body1/ "24"Center to face [mm]DIN ISO 228-1ISO 7-1/BS 21ASME B1.20.1GRcNPTInlet 1/2" aInlet3/4", 1" aOutlet 2402332431/ "23/ "4Height [mm]Inlet 1/2" H max.Inlet 3/4", 1" H max.Inlet thread maleSize outlet body1/Conventional design3/ "1"42"Long version1/ "1"23/4"1"Center to face [mm]DIN ISO 228-1GISO 7-1/BS 21ASME B1.20.1RNPTInlet aOutlet b333033373637333033373637333033373637Inlet a313134313134313134Outlet b303737303737303737Height [mm]Size inlet threadDIN ISO 228-1GH max.ISO 7-1/BS 21RH max.ASME B1.20.1NPTH max.Length of screwed end c [mm]Size inlet threadDIN ISO 228-1GISO 7-1/BS 21RASME B1.20.1NPTConventional design1/3/ "2"42102122132142162163/8"208––3/ "812––1"2172202241/2"141922Long version3/ 382412451"182327dRequired installation diameterConventional design – female threadConventional design – male threadLong version – male thread11