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Accessories and OptionsO-ring damper – Subassembly item 40The O-ring damper can be employed to suppress or reduce oscillations of moving parts in a safety valve.Background:In every spring loaded safety valve the movable parts disc, spindle, lower spring plate and the spring form a so called springmasssystem. As with all spring-mass systems, these parts can become excited by unfavorable operating conditions (e.g. inletpressure drop) or by vibrations transferred from other equipment. Vibrations occuring at resonance frequency can cause thesafety valve to undergo rapid, uncontrolled opening and closing, which will cause the valve to function improperly and notallow it to relieve the certified capacity.In general two kinds of uncontrolled oscillations exists (definitions according to ASME PTC 25-2001, chapter 2.7):chatter:flutter:“Abnormal rapid reciprocating motion of the movable parts of a pressure relief valve in which the disc contactsthe seat.” Causes for chattering are, among other things, high pressure losses in the inlet piping, excessivebuilt-up back pressure and operation of the valve in the partial load range.“Abnormal rapid reciprocating motion of the movable parts of a pressure relief valve in which the disc does notcontact the seat.” Causes for fluttering are vibrations with small or hardly measurable amplitude, where highfrequency vibrations accumulate from external influences. The vibrations are usually induced by separate units(e.g. motors, pumps) and transmitted via a mechanical connection or the medium to the safety valve.LESER developed the O-ring damper at LESER‘s certified test labs based on long experience in the operation of safety valves.The O-ring damper is able to completely stabilize function or reduce oscillations to slow, uncritical movements. Also, the safetyvalve will still operate within the required ranges of the applicable codes and standards. Due to its design, the O-ring damper isable to be used for any type of oscillation.LESER offers the O-ring damper incorporated in the gastight cap H2 or in a modified lifting device H4 with packed lever.For applications with lubricating fluids, e.g. oil, the balanced bellows design must be selected to protect the O-ring damperfrom the fluid.Available designsCap H2Packed lever H4Design8222832728222832715131412OptionsOption Conventionel design J65 J66codeBalanced bellows design J65, J78 J66, J78Temperature range O-ring-20 °C – +180 °C-4 °F – +356 °F99/18 LWN 480.01-E
Accessories and OptionsO-ring damper – Subassembly item 40AvailabilitySeries 526Valve sizeCap H2 and Packed lever H4Pressure rangeSafety valves with O-ring damper are not designated in the ASME code.For applications according to CE/VdTUEV O-ring damper are available on request.LESER has ensured proper performance of the O-ring damper through extensive tests at its certified test labs.If an O-ring damper is required further testing must be performed, which will require a longer lead time; please contact sales@leser.com.MaterialsItem Component Cap H2 Packed lever H41 Lever cover2 Cap H213 Parallel pin14 Securing ring15 Spindle22 Opposite ring27 Bush27 Nozzle82 Spring83 O-ring– 1.4408– CF8M1.4404 1.4404316L316L– A4– Steel– 1.4571– 316Ti– 1.4404– 316L1.4404 1.4404316L316L1.4404 –316L –– PFTE 15% glas– - " -1.4310 1.4310Stainless steelStainless steelViton ® Viton ®- " - - " -OptionsLWN 480.01-E99/19
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APIFlanged Safety Relief ValvesSeri
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ContentsChapter/PageGeneral 00/01Ap
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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
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Type 526Orifice EPressure temperatu
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Type 526Orifice FArticle numbers, d
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Type 526Orifice FPressure temperatu
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Type 526Orifice GArticle numbers, d
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Type 526Orifice GPressure temperatu
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Type 526Orifice HArticle numbers, d
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Type 526Orifice HPressure temperatu
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Type 526Orifice JArticle numbers, d
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Type 526Orifice JPressure temperatu
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Type 526Orifice KArticle numbers, d
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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
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Type 526Orifice NArticle numbers, d
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Type 526Orifice NPressure temperatu
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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 and 118: Accessories and OptionsSoft sealSof
Page 119 and 120: Accessories and OptionsBalanced bel
Page 121 and 122: Accessories and OptionsLift indicat
Page 123: Accessories and OptionsHeating jack
Page 127 and 128: Fax OrderPlease send your request t
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