Pilot Operated Safety Relief Valve
Pilot Operated Safety Relief Valve71/76/78/86 Series
POSRVSARASIN-RSBDQuality assurance (division)Weir Power & Industrial operates qualityprogrammes to cover the full scope of theiractivities. Comprehensive quality systems have beendeveloped to serve the power, oil and gas andindustrial markets which they serve.The company holds approvals to or complies with: ASME Section III ‘N’, ‘NPT’, ‘NV’ASME Section I ‘V’ASME Section VIII ‘UV’BS EN ISO 9001: 2000NF EN ISO 9001: 2000NF EN ISO 14001: 2000API Q1 TO API LICENCES API 6D (6D-0182) ANDAPI 6A (6A-0445)API STD 520API STD 526API STD 527API STD 2000ISO 41266A-04456D-0182The Quality systems have been approved for thesupply of products to meet the requirements of thePressure Equipment Directive (PED) and compliancemodules A, D1, H, B&D have been applied incategories I through IV respectively.Sarasin-RSBD Pilot OperatedSafety Relief ValvesThe Sarasin-RSBD pilot-operated safety relief valve isan autonomous valve. It does not need any auxiliarysource of power to operate. The advancedtechnology of Sarasin-RSBD valves has been adoptedby the nuclear industry, French and U.S. Navies, Oil& Gas, LNG and Petrochemical industries. It iscomplementary to the range of spring-loaded safetyrelief valves and covers a wide field of applicationsunder severe conditions.Advantages of the Sarasin-RSBD Pilot-OperatedSafety Relief Valve Leak-free pilot Limited maintenance Perfect tightness (no production loss) Perfect operation even with capacities smallerthan those rated with all kinds of fluids Excellent repeatability and reliability Adjustable blowdown No pressure/flow limit With additional equipment (solenoid valve),the safety relief valve can be used as adischarge valve. Perfect operation on steam with dedicated DCMpilotThe company is committed to compliance withlegislation and has an established environment andhealth and safety policy.An ongoing commitment to customer care is metthrough the process of continuous improvementand the further development of our systems andprocesses towards meeting ISO 9001:2000.Valve Testing FacilitiesAll pressure containing items are hydrostaticallytested, seat leakage tested and functionally tested.In addition, gas, packing emission, cryogenic andadvanced functional testing can be arranged.CONTENTSPOSRV Introduction4POSRV Benefits5Standard Features6Pop Pilot DGS (gas only)8Modulating Pilot DCS (gas & liquid)10High Temperature Pilot DCM1371 Series1576 Series1678 Series2586 Series34Codifications35Material testing facilities Non-destructive examination by radiography,ultrasonics, magnetic particle and liquidpenetrant. Chemical analysis by computer controlled directreading emission spectrometer. Mechanical testing for tensile properties atambient and elevated temperatures, bend andhardness testing. Charpy testing at ambient,elevated and sub-zero temperatures.Further technical information can be obtained fromour Web site: http://www.weirpowerindustrial.comPOSRV 4-0710Weir Power & Industrial First choice for power and industrial protection3
POSRVSARASIN-RSBDThe Sarasin-RSBD POSRV range complies with mostof the industrial applications met nowadays:offshore, refining, LNG terminals, etc. However itmay be, it has to be recognised a POSRV operatesdifferently from a spring loaded SRV. In this wayprocess characteristics can sometimes cause risks ortroubles on spring loaded SRV. A POSRV is often thesolution. It is then recommended to the processpeople to clearly define the overpressure scenario inorder to select the correct POSRV with – if necessary– its correct options.GeneralSarasin-RSBD, a world leader in overpressureprotection solutions, offers a unique range of pilotoperated safety relief valves. Sarasin-RSBD’sexperience in pressure safety valves, starting at theend of the eighteenth century, has allowed us todevelop and to refine the following range of valves: Portable POSRV (71 series)Full nozzle POSRV (76 series)Semi-nozzle POSRV (78 series)High temperature steam service full nozzlePOSRV (86 series)POSRV featuresFeaturesASME B&PVC SECTION VIII Division 1API STD 520API STD 52671 Series76 Series78 Series86 SeriesYesYes(D orifice andabove only)NoYesYesYesYesYesYesYesYes(spring loadedSRV tables)YesYesYesYesYesYesYesYesYesYesNoYesYesAPI STD 527ISO 4126-4EN 764-7ASME B16.34NACE (MR0175/ISO15156 MR0103)PED 97/23/ECATEX 94/9/ECFull liftNon-flowing pilotsPop pilotModulating pilotMaintenance free designSoft seat ring loadedSRV tables)YesYesYesYesYesYesYesYesYesYesYesYesOn applicationMetal seat designFlangedThreaded / YesYesYesYes(S.P. 100 barg)YesYesNoYesYesNoPressure limits (1)barg (psig)MinimumMaximum71 Series76 Series78 Series86 431(6250)431(6250)431(6250)180(2610)Temperature limits (1) for standard configurations C ( F)71 SeriesMinimumMaximumNote:476 Series78 Series86 0 (2) – 550 (3)(446)(446)(446)(446)(446)(842 (2) - 1022 (3))1 - For pressure and temperatures above these limits, please consult factory.2 - Temperature limit at pilot inlet3 - Temperature limit at temperature sense locationWeir Power & Industrial First choice for power and industrial protectionPOSRV 4-0710
POSRVSARASIN-RSBDBenefitsIncreased Profits: Avoid chattering (remote opening or modulating) Avoid water hammer (modulating) Increased production Increased tightness near set pressure Not as sensitive as spring loaded valve onpumping service Soft seat design provides repeatable bubbletight performance Reduced number of valves (compared to Springloaded) Reduced weight and dimensions (compared tospring loaded SRV) Reduced product loss (modulating) Reduced environmental pollution (modulating) Reduced noise (especially on modulating valve) Reduced reaction force (especially on modulatingvalve) Reduced maintenance time and cost.Safe OperationFlow Control by Nozzle DiameterIn respect of calculation code for flow calculation,there is no risk of massive over-capacity. The highlift provides the sonic flow in the nozzle, not atthe curtain area and so preserves the soft seatEasy Maintenance Top entry design (78 series)All maintenance operations can be done withouttaking out the valve from installation or specifictooling Replaceable nozzleIn case of heavy damage, nozzles of each valvetype can be easily changed: top entry jointingsemi-nozzle for 78 series, full nozzle for 71 series,76 series and 86 series Soft seat and sealQuick maintenance with 78 series soft seat (softseat for 76 series on demand) and seals for allseries.POSRV 4-0710Weir Power & Industrial First choice for power and industrial protection5
POSRVSARASIN-RSBDStandard featuresPop POSRV OperationsPop Action PilotTypical lift characteristics Immediate full lift at set pressureFully open No throttling Allows US DOT installation to be set higherthan MAOP.3% Min.Modulating Action PilotBlowdown Opening according to the required capacity,without either simmer or chatteringClose100105% Set Pressure Reliable operation even on biphasicapplication Auxiliary feeding: Allow the feeding with analternate clean gas if necessary.110Modulating POSRV OperationsTypical lift characteristicsFully open% Lift(Capacity)755025Close100105% Set Pressure110Optional featuresPilot Vented to Body Bowl/Outlet Flange To use when fluid cannot be vented toatmosphere (environmental protection) Only with modulating pilot (DCS)Remote Pressure SensingDirect pressure sense from protected equipment.It guarantees a stable opening whatever theupstream pressure drop is. In other words, itavoids chattering that can occur on springloaded design under certain conditions (i.e. PSVremote from protected equipment occurring apressure drop over the limit of 3% for springloaded PSV).NormalOperationAt SetPressurePilot Vented to Body Bowl / Outlet FlangePilot Supply Filter Set on the sensing line upstream from thepilot Used for fluid with large amount of particlesmatterEquipmenttoProject All stainless steel Element can be cleaned.Heat ExchangerRemote Pressure Sensing Coiled tube for hot temperatures Buffer tank for very hot temperature.6Weir Power & Industrial First choice for power and industrial protectionPOSRV 4-0710
POSRVSARASIN-RSBDBack Flow PreventerWithoutBack Pressure Operating PressureWith Prevents unexpected reverse flow whichoccurs through the POSRV, when the exhaustof the pilot is connected onto the outletflange. In this scenario, the downstreampressure (superimposed back pressure) canbe sometimes greater than the sensedpressure (differential pressure). It can occurfor many reasons. One of them appears onmultiple valves when they are connected onthe same collector Prevents unexpected vacuum upstream thepilot (i.e. at start-up).Manual Blowdown Valve (Manual Unloader)Normal OperationBack Pressure Operating PressureBack Flow PreventerAllows the POSRV to open and depressurise theequipment. It is set on the line between the pilotand the main valve dome. When open, it ventsthe dome faster than the pilot recharge inpressure. So the dome pressure is reduced andthe main valve opens. Nevertheless it is preferredto use the pilot lifting lever (no continuous flowthrough the pilot exhaust).Field Test ConnectionTesting of set pressure and functioning of mainvalve during normal operation of the protecteddevice, whatever the equipment pressurelevel is.Pilot Lifting LeverRemote Unloader (Remote Opening)Allows opening the valve from a control roomwhatever the equipment pressure level is.COMPRESSEDGASNormal OperationSetting ControlDual FilterUsed to ease maintenance and improveproduction.Dual PilotField Test ConnectionUsed to ease maintenance and improveproduction.SolenoidValvePressure Differential SwitchSenses main valve opening and sends a signal(pneumatic or electric).Normal OperationSetting ControlRemote UnloaderPOSRV 4-0710Weir Power & Industrial First choice for power and industrial protection7
POSRVPop Pilot DGS - Gas only Non-flowing pop action pilot for gas service Due to its simple concept and easy maintenance,this pilot can be used on all standard gasapplications The immediate full lift of the valve avoids allfreezing risk and instability due to up-streampressure dropSARASIN-RSBD Pilot Tightness Pressure (before opening): 95% ofset pressure Immediate full lift of the main valve at setpressure (without overpressure) Field adjustable blow down: 2% to 5% of setpressure (factory standard is 5%). Non-overpressure and short blow down limit theproduct loss to the required quantity and reduceopening time.Features: Gas application Non-flowing Set Pressure range: 1.8 to 431 barg (26.1 to 6250psig) Temperature range: -50 C to 230 C (-58 F to 446 F) Maximum Expected Working Pressure: 95% ofset pressureDGS Pilot operations8Weir Power & Industrial First choice for power and industrial protectionPOSRV 4-0710
POSRVSARASIN-RSBDPop Pilot DGS - Gas onlyMaterials for standard applications, hightemperature, and corrosive SocketSeatNozzleSpring washerAdjusting boltLocknutNutBall springSpringBallStrainerCapCap gasketO-ringVentBearingGuideSpacer rodDisc ballSpring spindleO-ringO-ringO-ringBonnet gasketSpindleSS 316LSS 316LSS 316LA 564 Gr 630 (17-4PH)A 564 Gr 630 (17-4PH)SS 316LA 564 Gr 630 (17-4PH)SS 316LSS 316LSS 316LSSSSSSCeramicSSSSKlinger(B)SSA 564 Gr 630 (17-4PH)SS 316LSS 316LCeramicSS 316L(A)(B)(A)KlingerA 564 Gr 630 (17-4PH)(A) : FKM, NBR, EPDM, FFKM(B) : FKM, EPDM, FFKM, FEP FKMPOSRV 4-0710Weir Power & Industrial First choice for power and industrial protection9
POSRVSARASIN-RSBDModulating Pilot DCS - Gas and Liquid Non-flowing modulating pilot for gas and/orliquid Its particularity is to vent the dome only abovethe set pressure. This original feature operatesindependently of the maximum workingpressure, temporary pressure rising very close tothe set pressure (98%) without any dischargefrom the pilot Additionally, the overpressure needed to obtainthe full lift of the main valve is less that 3%. Thispoint reduces the risk of simmering and thusreduces seat ageing This pilot is to be used on liquid, mixed gas-liquidor gas when “smooth” operation is required.Features: Gas, liquid and mixed phases application Non-flowing Pressure range: 2 to 431 barg (29 to 6250 psig) Above please consult the factoryAuxiliary feedingPilot’s critical internal parts and main valves domeare isolated from the protected system. Effectively,the line which pressurises the dome is isolated fromthe one which senses the pressure and so anauxiliary clean fluid can be used to close the mainvalve. The fail-safe operation is kept (i.e. the mainvalve will open in the case of auxiliary fluid failure). Temperature range: -50 C to 295 C (-58 F to 563 F) and 600 C (1112 F) with HeatExchanger Maximum Expected Working Pressure: 95% of setpressure Pilot Tightness Pressure (before opening): 98% ofset pressure Modulating upto 3% overpressure, then full lift(for modulating over 3%. please consult factory) Blowdown: 2% to 5% of set pressure (factorystandard is 5%).10Weir Power & Industrial First choice for power and industrial protectionPOSRV 4-0710
SARASIN-RSBDPOSRVDCS Pilot operationsPOSRV 4-0710Weir Power & Industrial First choice for power and industrial protection11
POSRVSARASIN-RSBDModulating Pilot DCS - Gas and liquidMaterials for standard applications, hightemperature, low temperature and ston design for pressures over 36 barg (522 psig)Diaphragm design for pressures upto 36 barg (522 tCapExhaust nozzleDiscFeeding bracePistonGuideBallSpindleDrain plugSpringSpring washerAdjusting boltLock-nutCap studNutDrain spindle O-ringSeat O-ringO-ringDisc O-RingBraceNut of drain spindleLock washerMembrane (1)Guide ringDrain spindleFeeding seatDetection pistonDisc springExhaust springStrainerRingBug screenElastic ringWasherNozzle O-ringShuttle (2)Backup RingBody GasketStandardMaterialsSS 316LSS 316LSS 316LSS 316LSS 316LSS 316LSS 316LSS 316LSS or ceramicSS 316LSS 316LCoated CSSS 316LSS 316LSS 316LSSSS(A)(A)(A)(A)A 564 Gr 630 (17-4PH)SSSS(A)Thermoglide SS 316LA 564 Gr 630 (17-4PH)SS 316LAlloy X750Alloy X750SSAlloy 600SSSSSS 316L(A)SS 316LPTFE(A)Exotic MaterialEM1EM6EMSS 316LSS 316LEMEMEMSS 316LSS 316LSS or ceramicSS 316LEMCoated CSSS 316LSS 316LSS oy X750EMEMEMEMEM(A)(A)(A)(A)SSSS(A)Thermoglide EMEMEM(A)Thermoglide EMSS 316LAlloy X750Alloy X750EMAlloy 600SSEMEM(A)EMPTFE(A)EMAlloy X750Alloy X750EMAlloy 600SSEMEM(A)EMPTFE(A)(A) FKM (dipolymer), Steam FKM, NBR, EPDM, FFKM12Weir Power & Industrial First choice for power and industrial protectionPOSRV 4-0710
POSRVSARASIN-RSBDHigh Temperature Pilot DCMStage 1Stage 2The DCM high temperature pilot detector is aclosed neutral bi-stable design. Leak tightness isachieved by the use of metallic seals throughout.PrincipleThe DCM pilot detector is continuously pressurized.It combines the three key functions required of apilot-operated safety relief valve: Pressure detection 3-way control 3-way power.Features Minimum setting pressure : Pr 20 Bar (298 PSI)The operating pressure PS inside the equipmentbeing protected is less than Pr-3 (Pr set pressure),the pilot detector is open and the valve piston ispressurized.THE SAFETY RELIEF VALVE IS CLOSED.The pressure PS rises to reach a value equal to 0,95Pr, the 3-way control hydraulically isolates thevolume. The piston at the valve head remainsunder pressure.THE SAFETY RELIEF VALVE REMAINS CLOSED. Temperature of the fluid in the pilot : max T 565 C (1050 F) Pressure/temperature : ASME 2500 class ratingin appropriate materials Working pressure : PS 95% Pr Blowdown not adjustable 7%Stage 4Stage 3 Fluid : Steam saturated or superheated Liquids : water (for others, please contact us) Natural or industrial gases (sour gas - NACE) Weight : 30 kg (66,2 lb) Size : H 355mm (14in); Ø maxi : 185mm (7.3in) Integrated filters : 250u to the pilot feed and 40u3-way control valve protection.Valve opening lowers pressure PS inside theequipment being protected to a value less than Pr.The pilot detector hydraulically isolates the drainfrom the valve head.A FURTHER DECREASE IN PRESSURE PS TRIPSTHE PILOT DETECTOR AND CAUSES RETURNTO PHASE 1.POSRV 4-0710The pressure PS in the equipment being protectedreaches the set point Pr, the pilot detector trips andthe fluid contained by the top face of the piston inthe valve head is drained.THE RELIEF-VALVE OPENS AT Pr SETPOINT.Weir Power & Industrial First choice for power and industrial protection13
POSRVSARASIN-RSBDPart ListBodySS 316LFlangeSS 316LHead bodySS 316LHead coverSS 316L3-way cartridgeStainless steelPiston bellows setStainless steelDetection headStainless steelSpring washerFe15 D07FilterMetallic sealWeir Power & Industrial First choice for power and industrial protectionStainless steelPower distributorDetection head bellows set14MaterialStainless steelSS 316LStainless steel/NickelPOSRV 4-0710
POSRVSARASIN-RSBD71 SERIES – Full nozzle - PortableMaterials for standard applications, very lowtemperature and corrosive fluids.The 71 series is a portable pilot operated valve.The design of 71 series is dedicated to small flow. Itcan also be used as discharge valve.The 71 series is only supplied with our pop actingpilot DGS (gas only).The dimensions A and B of the 71 series complywith the ones of our 9 series (spring loaded portablevalve).1001522214The 71 series can be supplied threaded, flanged,with welded or hub ends.334626The available orifice is D (API 0.71 cm2 - actual 171821222526323346100DesignationStandard material-29 C to 260 CMaterial code AStandard material forcorrosive fluid & very lowtemperature below -29 CMaterial code XBodyCoverPistonNozzlePiston RingGuide RingPiston SealDiscRingFittingDome Line FittingPlug GasketCover GasketNozzle GasketDome LineNutWasherPlugU BoltReturn SpringPilot (body)SA 216 Gr WCCSS 316LSS 316LSS 316LSS 316LThermoglide PTFESS 316LSSSS 316LSS 316LSS 316LSS 316LSS 316LSS 316LSS 304SS 304SS 316LSS 304LSS 316LSS 316LSA 351 Gr CF3MSS 316LSS 316LSS 316LSS 316LThermoglide PTFESS 316LSSSS 316LSS 316LSS 316LSS 316LSS 316LSS 316LSS 304SS 304SS 316LSS 304LSS 316LSS 316LNote :1. Other materials on request.2. Other orifices on request.POSRV 4-0710Weir Power & Industrial First choice for power and industrial protection15
POSRVSARASIN-RSBD76 SERIES – Full nozzle- API STD 526Tables 2 to 15 dimensionsMaterials for standard applications, hightemperature, low temperature and corrosivefluids.35502The 76 series is a versatile pressure relief valve.The design of 76 series particularly fit togetherextreme conditions as Cryogenic, Liquefied NaturalGas and Steam.The dimensions of the 76 series complies with thedimensions of the API STD 526 Table 2 to 15 (springloaded SRV).4011a101183828468This valve is particularly suitable when exchangingwith an API spring loaded SRV as it will fit into itsdimensions and avoid costly piping modification.Please note that if you wish to connect the sensingline on the valve inlet with a flange finish differentthan Raised Face (through the nozzle basethickness), the A dimension (on small PSV sizes)could deviate from API STD 526. Please consult thefactory.5611326187TagDesignationStandard material-29 C to 260 CMaterial Code AStandard materiallow temperature-45 C to -29 CMaterial Code LStandard materialcorrosive and very lowtemperature below -46 CMaterial Code X1268101111a323540465056828387BodySleeve AssemblyNozzlePiston RingPiston SealDiscSoft SeatDrain PlugStudSleeve Assembly GasketReturn SpringNutPistonSoft Seat RetainerRetainer ScrewSensing Line FittingSA 216 Gr WCCSA 350 Gr LF2 SS 316LSS 316LThermoglide PTFE GraphiteSS 316L(1)CSSA 193 Gr B7KlingerSSSA 194 Gr 2HSS 316LSS 316LSSSSSA 352 Gr LCCSA 350 Gr LF2 SS 316LSS 316LThermoglide PTFE GraphiteSS 316L(1)CSSA 193 Gr B7KlingerSSSA 194 Gr 2HSS 316LSS 316LSSSSSA 351 Gr CF8MSS 316LSS 316LThermoglide PTFE GraphiteSS 316L(1)SSSA 320 Gr B8KlingerSSSA 194 Gr 8SS 316LSS 316LSSSSNote:1 - FKM, NBR, EPDM, FFKM16Weir Power & Industrial First choice for power and industrial protectionPOSRV 4-0710
POSRVSARASIN-RSBD76 SERIES – Full nozzle - API STD 526Tables 2 to 15 dimensionsMaterials for Cryogenics and LiquefiedNatural Gas.Liquefied Natural Gas and more generally cryogenicapplications require special features for the 5019240End-users and contractors must be aware that anyleakage on cryogenic applications could create anice ball around the seat and affect the pressuresafety valve’s reliability.In order to prevent any leakage due to seatdamage, Sarasin-RSBD recommends the use of asoft seat.468TagDesignationMaterial forCryogenics and LNGbelow -46 CMaterial code 794959697100105BodySleeve AssemblyNozzlePiston RingPiston SealDiscSoft SeatBracketBracket NutSensing LineDome LineInlet Pilot FittingOutlet Pilot FittingsDrain PlugLine End Male AdapterStudCover Plate GasketReturn SpringNutPistonBackflow PreventerSoft Seat RetainerRetainer ScrewSensing Line FittingBracket ScrewBracket NutStrapStrutPilot (body)Lifting Eye BoltSA 351 Gr CF8MSS 316LSS 316LThermoglide PTFE GraphiteSS 316LSee Soft Disc Material tableSS 316LSS 316LSS 316SS 316SSSSSSSSSA 320 Gr B8KlingerAlloy X750SA 194 Gr 8SS 316LSS 316LSS 316LSSSSSS 316LSS 316LSS 316LSS 316LSS 316LCS108835611a1182632187Soft Seat MaterialSet Pressure (barg)Seat Material1 SP APTFEA SP BPCTFEB SP CPEEKA, B and C: demands on the size of the valve please consult factoryPOSRV 4-0710Weir Power & Industrial First choice for power and industrial protection17
POSRVSARASIN-RSBD76 SERIES – Full nozzle - API STD 526Tables 2 to 15 dimensionsCorrosive and sour gas serviceMany process streams in the oil and gas industrycontain enough H2S to cause sulfide stress cracking(SSC) in susceptible materials. It exists in twodifferent domains in which two different standardsmay be applicable: Oil and Gas production: NACE MR0175/ISO 15156 Part 1 - 2001 : General principles for selectionof cracking-resistant materials Part 2 - 2003 : Cracking-resistant carbon andlow alloy steels, and the use of cast irons. Part 3 - 2003 : Cracking-resistant CRAs(corrosion-resistant alloys) and other alloys. Oil and gas refining: NACE MR0103Weir Power & Industrial France manufactures alarge variety of valves used in sour service. Based onour experience and the last edition of the standards,the definition of the actual critical components in apressure safety valve should be mutually agreedbetween the purchaser and Weir Power &Industrial.Please note, materials are applicable for NACEMR0175/ISO 15156 according to the differentparagraphs of the standard. As a first approach, wecan note the following:MaterialsParagraphSA 352 Gr LCCSA 216 Gr WCCSA 217 Gr WC6SA 479 Gr 316LUNS S31803UNS N06625UNS N07750MR0175/ISO 15156-2 ¶ A2-1-2MR0175/ISO 15156-2 ¶ A2-1-2MR0175/ISO 15156-2 ¶ A2-1-2MR0175 ISO 15156-3 ¶ A2-2 Table 2MR0175/ISO 15156-3 ¶ A7-2 Table 24MR0175/ISO 15156-3 ¶ A4-2 Table 13MR0175/ISO 15156-3 ¶ A2-9 Table 36The last revisions of NACE MR0175/ISO 15156 showsresults of the inadequacy of some standardmaterials commonly used in the oil and gasindustry. We then highlight this point and ask theend-user to clearly specify the conditions of use(fluid details, pressure and temperature) in order tobe able to select acceptable materials.As an example of selection, Weir Power and Industrial can advise the following valve configuration.The conditions here are not so restrictive: temperature limited to 149 C (300 F).SGA application : applicable on primary side onlyPart N Part NameMaterialApplicable Paragraph1342514BodyNozzleDiscSleeve AssemblyPistonSpringOther partsSA 216 Gr WCCUNS S31803 (Duplex)UNS S31803 (Duplex)UNS S31803 (Duplex)SA 479 Gr 316LAlloy X750StandardMR0175/ISO 15156-2 ¶ A2-1-2MR0175/ISO 15156-3 ¶ A7-2 Table A24MR0175/ISO 15156-3 ¶ A7-2 Table A24MR0175/ISO 15156-3 ¶ A7-2 Table A24MR0175/ISO 15156-3 ¶ 1 Table A1SGB application : applicable on primary and secondary sidesPart N Part NameMaterialApplicable Paragraph1342514BodyNozzleDiscSleeve AssemblyPistonSpringOther partsSA 216 Gr WCCUNS S31803 (Duplex)UNS S31803 (Duplex)UNS S31803 (Duplex)SA 479 Gr 316LAlloy X750StandardMR0175/ISO 15156-2 ¶ A2-1-2MR0175/ISO 15156-3 ¶ A7-2 Table A24MR0175/ISO 15156-3 ¶ A7-2 Table A24MR0175/ISO 15156-3 ¶ A7-2 Table A24MR0175/ISO 15156-3 ¶ 1 Table A1Note : Above 233 C (500 F), parts 2-3-4 will be proposed in UNS N06625 (Alloy 625).18Weir Power & Industrial First choice for power and industrial protectionPOSRV 4-0710
POSRVSARASIN-RSBD76 SERIES – Full nozzle- API STD 526Tables 2 to 15 dimensionsDUPLEXApplication : corrosive fluid and offshore35502401084685611326187Part N Part NameMaterial code D1Material code D61268101132354046505687BodySleeve AssemblyNozzlePiston RingPiston SealDiscDrain PlugStudSleeve Assembly GasketReturn SpringNutPistonSensing Line FittingSA 216 Gr WCCSA 350 Gr LF2 SS 316LDuplexThermoglide PTFE GraphiteDuplexCSSA 193 Gr B7KlingerSSSA 194 Gr 2HSS 316LSSDuplex (1)Duplex (1)Duplex (1)Thermoglide PTFE GraphiteDuplex (1)Duplex (1)Duplex (1)Alloy X750Duplex (1)Duplex (1)SSNote : 1 – Duplex standard (22%) UNS 31803, superduplex (25%) UNS 32750 or 32760 on requestPOSRV 4-0710Weir Power & Industrial First choice for power and industrial protection19
POSRVSARASIN-RSBD76 SERIES – Full nozzle- API STD 526 Tables 2 to 15 dimensionsPressure limits (1)barg (psig)Gas/LiquidPop (DGS)SteamModulating (DCS)DCSStandardconfigurationSpecial configurationwithout Heat ExchangerSpecial configurationincl. Heat (2175)Temperature limits (1) CGas/Liquid( F)Pop (DGS)StandardconfigurationSteamModulating (DCS)SpecialStandardconfiguration lconfiguration configurationwithout HeatExchangerSpecialconfigurationincl. 0(446)295(563)600(1112)Note:1 - For pressures and temperatures above these limits, please consult factory.2 - Temperature limit at pilot inlet3 - Temperature limit at temperature sense location4 - The temperature and pressure limits depend on the soft good nature. Please contact the factory for Pilot Vented to Body BowlRemote Pressure SensingPilot Supply FilterHeat ExchangerBack Flow PreventerManual Blowdown ValveSeparate Feeding (dirty service)Field Test ConnectionPilot Lift LeverRemote Unloader (remote opening)Dual FilterDual PilotPressure Differential SwitchConfigurationsPop actionModulating actionNon-flowingBlowdownSeat Tightness before opening (% of Set Pr.)Back Pressure limitswith pilot vented to atmospherewith pilot vented to body efied Natural GasCryogenicWater Hammer ReductionPumping system20Pop (DGS)Modulating sYesYesYesYesYesYesYesYesYesYesYesNoYes2% to 5%95%NoYesYes2% to 5%98%97%97%00Depends on set pressure level –Consult factoryYesNoNoNoNoNoNoYesYesYesYesYesYesYesWeir Power & Industrial First choice for power and industrial protectionPOSRV 4-0710
POSRVSARASIN-RSBD76 SERIES – Full nozzle- API STD 526 Tables 2 to 15 dimensionsDischarge coefficientK (ASME Section VIII div. 1/ISO 4126)Gas, Vapor, SteamKD (API STD 520)LiquidGas, Vapor, SteamLiquid0.9750.650.848Pressure/Temperature Rating Table (barg / C)SA 216 Grade WCCSA 351 Grade CF8MTemperaturefrom -29 C15030060090015002500 Temperaturefrom -196 C1503006009001500 78.1263.5156.6Note: 1 - For pressures and temperatures above these limits, please consult factory.POSRV 4-0710Weir Power & Industrial First choice for power and industrial protection21
POSRVSARASIN-RSBD76 SERIES - Full nozzle - API STD 526 Tables 2 to 15 dimensionsOrifices Tables - Inlet x Outlet combinations according API STD 526 6Th Ed. 2009 (spring loaded SRV tables)POSRV 76 .7855.065HIO1.5 31.5 3JI O2 32 33 43 43 43 5318.406LIO34344646464 6*FLANGERATINGASMEB 16.5IO150300L1503006009001500 .1814.34028.000NIO4646464646-POSRV 76 series7.06912.91545.606 83.3226.38011.05041.16171.290PQIOI 8686 106 10-22.190143.161SI888-O101010-28.274 39.440182.413 254.45126.000167.742TUIOIO810 10 14810 10 14810 -46.750 61.630301.612 397.612V**IOI10 14 1210 14 -FlangeRatingASMEWB 16.5OIO2x12 150- 300L- 300 150- 600- 900- 1500 300Inlet and outlet size combinations as well as orifice sizes sho
API Q1 TO API LICENCES API 6D (6D-0182) AND API 6A (6A-0445) API STD 520 API STD 526 API STD 527 API STD 2000 ISO 4126 The Quality systems have been approved for the supply of products to meet the requirements of the Pressure Equipment Directive (PED) and
4, 5 port pilot operated valve 4TB 5 port pilot operated valve (pneumatic valve) 4L2-4/LMFO 3, 4, 5 port pilot operated valve (pneumatic valve) 4KA/4KB 5 port pilot operated valve (pneumatic valve) 4F 5 port pilot operated valve (ISO conformed valve) PV5G/PV5/CMF 3 port direct acting valve (small pneumatic valve) 3MA0/3MB0
Technical leaflet Pilot operated main valves for regulating pressure and temperature, type PM Design, function PM1 The PM main valve is a pilot operated valve whose function is determined by the pilot valve used. The main valve with pilot valve(s) controls refrigerant flow by modulation or on/off in accordance with the pilot valve or main valve
Solenoid Controlled Pilot Operated Directional Valves Solenoid Controlled Pilot Operated Directional Valves These valves are composed of a solenoid operated pilot valve and a pilot operated slave valve. When a solenoid is energised the pilot valve directs the flow to move the spool of the slave valve, thus changing the direction of flow in the .
Pilot-operated servo valve Type ICS ICS pilot-operated servo valves belong to the ICV (Industrial Control Valve) family. The valve comprises three main components: valve body, function module and top cover. ICS pilot-operated servo valves are pilot operated valves for regulating pressure, temperature and ON/OFF function in refrigeration systems.
Solenoid Controlled Relief Valves These valves are a combination of a pilot operated relief valve and a solenoid operated directional valve. Piping between the two is eliminated as the solenoid valve is directly mounted on the relief valve and connected with the relief valve vent. Pump pressure may be unloaded remotely by an electrical signal .
Data sheet Pilot-operated servo valve, type ICS Danfoss DCS MWA) 2016.01 DKRCI.PD.HS2.A9.22 520H8639 5 Function ICS 1 Pilot The ICS main valve is a pilot operated valve. The types of pilot valves used determine the function. The ICS main valve with pilot valve(s) controls refrigerant flow by modulation or on/off in
ICS 1 Pilot The ICS main valve is a pilot operated valve. The types of pilot valves used determine the function. The ICS main valve with pilot valve(s) controls refrigerant flow by modulation or on/off in accordance with the pilot valve and main valve status. The manual spindle can be used to open the valve plate.
Relief Valves Relief Valves Set pressure: 4 atm (gauge) Helium relief valve Anderson Greenwood pilot operated relief valve, Model No. 25905K34/S with a discharge area of 1186 mm 2 Nitrogen relief valve Flowsafe F84-8 ¾ X 1F SS 0.261 in 2 Relief Valve Magnet Failu
