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Accessories and OptionsMetal seat – Nozzle item 5 and disc subassembly item 7The LESER metal seats (disc and nozzle) are lapped to optical flatness to ensure a tight seal.LESER safety relief valves are supplied with standard leak tightness according to <strong>API</strong> 527.Improved tightness is available on request.Type 5267.17.557.2Stellited sealing surfacesThe sealing surfaces of stainless steel disc and nozzle can be stellited by build-up welding. Stellite is a cobalt-chromium based,non-ferrous alloy with increased hardness, corrosion resistance and wear resistance up to high temperatures.LESER recommends stellited sealing surfaces for Type 526 valves (seat and disc 1.4404 / 316L) in the following cases:- high pressure applications, due to the high stress of the sealing surfaces- high temperature applications to avoid a permanent deformation of the sealing surfaces,due to the material properties of the seat and disc- applications with abrasive fluids to increase the wear resistance of the sealing surfacesThe stellited sealing surfaces of disc and nozzle are standard for high pressure and high temperature designs;see table materials page 99/07.Type 5267.15Materials for disc and nozzle see page 99/07.Hardness metal seatMaterialHardness of sealing surfacesENASMEValues from standards ormanufacturers specificationAverage valueLESER stockEN 10088-3, 1.4122 hardened Hardened stainless steel ≥ 40 HRC LWN 325.01 Harding procedure 42 – 46 HRCEN 10272, 1.4404 SA 479 316L ≤ 215 HBW EN 10272 Table 7 16 – 19 HRC 1)EN 10272, 1.4404 stellited SA 479 316L stellited ≥ 35 HRC Manufacturers specification 40 HRCOptionsHBW: BRINELL hardness acc. DIN EN ISO 6506-1 / HRC: ROCKWELL hardness acc. DIN EN ISO 6508-11)Rockwell hardness values below 20 HRC are not allowed according to DIN EN ISO 6508-1.Lower, fictitious values were created for better comparison.99/06 LWN 480.01-E
Accessories and OptionsMetal seat – Nozzle item 5 and disc subassembly item 7Materials Disc – Subassembly item 7SteelStainless steelStandard Stellited Standard StellitedItemComponentOption code:J25 + L44Option code:*7.1 Disc7.2 Lifting aid7.5 Securing ring1.4122 hardened 1.4404 stellited 1.4404 stellited 1.4404 stellitedHardened stainless steel 316L stellited 316L stellited 316L stellited1.4404 1.4404 1.4404 1.4404316L 316L 316L 316L1.4571 1.4571 1.4571 1.4571316Ti 316Ti 316Ti 316TiMaterials Nozzle – Item 5Flange rating class150 – 300 600 900 – 2500Body material: WCB 1.0619, LCBNozzle material Standard 1.4404 1.4404 stellited 1.4404 stellited316L 316L stellited 316L stellitedStellited 1.4404 stellited 1.4404 stellited 1.4404 stellited316L stellited 316L stellited 316L stellitedOption code L62 * *Body material: WC6 1.7357Nozzle material Standard 1.4404 stellited 1.4404 stellited 1.4404 stellited316L stellited 316L stellited 316L stellitedStellited 1.4404 stellited 1.4404 stellited 1.4404 stellited316L stellited 316L stellited 316L stellitedOption code * * *Body material: CF8M 1.4408Nozzle material Standard 1.4404 1.4404 1.4404 stellited316L 316L 316L stellitedStellited 1.4404 stellited 1.4404 stellited 1.4404 stellited316L stellited 316L stellited 316L stellitedOption code L62 L62 *Due to the orifice size the sealing surfaces can differ from this table. For further details please refer to page 01/78.OptionsLWN 480.01-E99/07
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APIFlanged Safety Relief ValvesSeri
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ContentsChapter/PageGeneral 00/01Ap
Page 5 and 6:
General InformationGeneralApplicati
Page 7 and 8:
Valve finderHow to find the right A
Page 9 and 10:
How to useSelection chartsGeneralTh
Page 11 and 12:
How to useGeneral8Base of calculati
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LEOLGeneralThis table is based on t
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TypeType 526Type 526Packed lever H4
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Type 526Conventional designItemMate
Page 19 and 20:
Type 526Balanced bellows designMate
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Type 5264 5 6Options Documentation
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Type 526Article numbers - OverviewA
Page 25 and 26:
d 0 = Actual orifice diameterA 0 =
Page 27 and 28:
d 0 = Actual orifice diameterA 0 =
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Type 526WeightsUS UnitsBonnetallLif
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Type 526Orifice DArticle numbers, d
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Type 526Orifice DPressure temperatu
Page 35 and 36:
Type 526Orifice EArticle numbers, d
Page 37 and 38:
Type 526Orifice EPressure temperatu
Page 39 and 40:
Type 526Orifice FArticle numbers, d
Page 41 and 42:
Type 526Orifice FPressure temperatu
Page 43 and 44:
Type 526Orifice GArticle numbers, d
Page 45 and 46:
Type 526Orifice GPressure temperatu
Page 47 and 48:
Type 526Orifice HArticle numbers, d
Page 49 and 50:
Type 526Orifice HPressure temperatu
Page 51 and 52:
Type 526Orifice JArticle numbers, d
Page 53 and 54:
Type 526Orifice JPressure temperatu
Page 55 and 56:
Type 526Orifice KArticle numbers, d
Page 57 and 58:
Type 526Orifice KPressure temperatu
Page 59 and 60:
Type 526Orifice LArticle numbers, d
Page 61 and 62: Type 526Orifice LPressure temperatu
Page 63 and 64: Type 526Orifice MArticle numbers, d
Page 65 and 66: Type 526Orifice MPressure temperatu
Page 67 and 68: Type 526Orifice NArticle numbers, d
Page 69 and 70: Type 526Orifice NPressure temperatu
Page 71 and 72: Type 526Orifice PArticle numbers, d
Page 73 and 74: Type 526Orifice PPressure temperatu
Page 75 and 76: Type 526Orifice QArticle numbers, d
Page 77 and 78: Type 526Orifice QPressure temperatu
Page 79 and 80: Type 526Orifice RArticle numbers, d
Page 81 and 82: Type 526Orifice RPressure temperatu
Page 83 and 84: Type 526Orifice TArticle numbers, d
Page 85 and 86: Type 526Orifice TPressure temperatu
Page 87 and 88: Type 526Flange facingsIndication St
Page 89 and 90: Orifice900 x 300 1500 x 300 2500 x
Page 91 and 92: Type 526Spare parts - Disc (Item 7)
Page 93 and 94: Type 526Spare parts - Stainless ste
Page 95 and 96: Type 526Spare parts - Gasket Body /
Page 97 and 98: Type 526Spare parts recommendations
Page 99 and 100: Type 526ApprovalsApprovalsOrifice D
Page 101 and 102: Type 526Capacities - SteamCapacitie
Page 103 and 104: Type 526Capacities - AirCapacities
Page 105 and 106: Type 526Capacities - WaterCapacitie
Page 107 and 108: Accessoriesand OptionsContentsChapt
Page 109 and 110: Accessories and OptionsCaps and lev
Page 111: Accessories and OptionsCaps and lev
Page 115 and 116: Accessories and OptionsSoft seal di
Page 117 and 118: Accessories and OptionsSoft sealSof
Page 119 and 120: Accessories and OptionsBalanced bel
Page 121 and 122: Accessories and OptionsLift indicat
Page 123 and 124: Accessories and OptionsHeating jack
Page 125 and 126: Accessories and OptionsO-ring dampe
Page 127 and 128: Fax OrderPlease send your request t
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