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Accessories and OptionsBalanced bellows – Subassembly item 15LESER is able to provide a balanced bellows design throughthe use of stainless steel bellows.A BBalanced bellows are generally used for two applications:- to compensate for back pressure- to seal off the bonnet from the outlet chamberCompensation for back pressureThe back pressure acts on the reverse side of the disc, creating a forcein the closing direction (F c ) of the safety valve. The magnitude of this forcedepends on the seat area and the level of the back pressure. The balancedbellows constitute an opposite area with the same area like the seat. Theback pressure acts on, thereby reducing or eliminating the closing force. Thisreduction of the force in the closing direction can be viewed as a compensatingforce acting in the opening directon (F o ).p aA SF OF CA quantitative representation is shown in the table below:Actual area Back pressure Actual force Direction of force Compensation criteriaSeat area = A S p a F C = p a x A S closing A S = A BBellows area = A B p a F O = p a x A B opening F C = F OSealing the bonnet from the outlet chamberLESER‘s balanced bellows reliably seal the bonnet from the outlet chamber; protecting the guide,moving parts and the spring from problems associated with the fluid, such as dirt, corrosion, impurities of temperature.Operating conditionsOptionsTemperature limits [°C] up to 550 °C[°F] up to 1000 °FMinimum set pressure Orifice Steam /Air Water[bar] [psig] [bar] [psig]D 3,5 50,8 3,5 50,8E 3,5 50,8 3,5 50,8F 0,6 8,7 2,0 29G 3,2 46,4 2,8 40,6H 2,8 40,6 2,8 40,6J 3,5 50,8 5,0 72,5K 2,2 31,9 2,5 36,3L 3,5 50,8 3,5 50,8M 2,6 37,7 2,2 31,9N 1,8 26,1 1,8 26,1P 2,2 31,9 2,2 31,9Q 1,3 18,8 2,3 33,5R 1,0 14,5 1,4 20,3T 1,2 17,4 2,5 36,399/12 LWN 480.01-E
Accessories and OptionsBalanced bellows – Subassembly item 15Balanced bellowsType 526 Orifice D – 6 R 8 6 R 10 – 8 T 10DesignNPT 1 / 215.21115.315.1Bonnet spacer*–Bellows housing* *The bellows housing protects the bellows against turbulences during discharge to avoid bellows vibration and to guarantee a longer life-time.ControlthreadASME B1.20.1 NPT 1 / 2 * *A control thread ASME B1.20.1 NPT 1 / 2 is fitted into the bonnet to monitor the condition of the bellows.A discharge pipe can be fitted to the NPT 1 / 2 control thread to allow safe discharge of aggressive or toxic fluids.Bellows materialsFor standard bellows materials please refer to page 01/05. Hastelloy ® and Inconel ® are available as well.Option codeOpenbonnetClosedbonnetStandard bellows J68 J68Low pressure bellows – –Other materials than stand. S15 + material designation S15 + material designationStandard bellows J78 J78Low pressure bellows – –Other materials than stand. S15 + material designation S15 + material designationThe dimensions and weights of a safety valve with balanced bellows are displayed in the tables “Dimensions and weights”.The temperature range is displayed in the tables “Pressure temperature ratings”.Balanced bellows conversion kitsLESER balanced bellows conversion kits are available to convert from a convential design into a balanced bellows design withlittle effort. The conversion kits contain all the necessary parts for conversion as well as instructions.Conversion kitsItem Component Quantity Material Remarks8 Guide11Bonnet spacer /Cooling spool12 Spindle15 Bellows55 Stud60 Gasket–InstallationinstructionFor article no. and spare parts please refer to spare part page 01/79.1 1.4404316L1 1.4404316L1 1.4404316L1 1.4571316Ti4, 8, 12 depends on valve size 1.4401B8M2, 3 depends on valve size Graphite / 1.4401Graphite / 3161 LWN 037.05OptionsLWN 480.01-E99/13
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APIFlanged Safety Relief ValvesSeri
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ContentsChapter/PageGeneral 00/01Ap
Page 5 and 6:
General InformationGeneralApplicati
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Valve finderHow to find the right A
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How to useSelection chartsGeneralTh
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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
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Type 526Balanced bellows designMate
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Type 5264 5 6Options Documentation
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Type 526Article numbers - OverviewA
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d 0 = Actual orifice diameterA 0 =
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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
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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
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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
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Type 526Orifice LArticle numbers, d
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Type 526Orifice LPressure temperatu
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Type 526Orifice MArticle numbers, d
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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 and 112: Accessories and OptionsCaps and lev
Page 113 and 114: Accessories and OptionsMetal seat -
Page 115 and 116: Accessories and OptionsSoft seal di
Page 117: Accessories and OptionsSoft sealSof
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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