Pilot Operated Pressure Relief Valves Series 200, 400, 400 Iso-Dome, 500, 700 and 800 Series 200, 400, 400 Iso-Dome, 500, 700 and 800 Pilot Operated Pressure Relief Valves ANDERSON GREENWOOD flow control Introducing Our New Higher Capacity Main Valve Design Introducing Our New Higher Capacity Main Valve Design
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Pilot Operated Pressure Relief ValvesSeries 200, 400, 400 Iso-Dome, 500, 700 and 800Series 200, 400, 400 Iso-Dome, 500, 700 and 800
Pilot Operated Pressure Relief Valves
ANDERSON GREENWOODflow control
Introducing
Our New Higher Capacity
Main Valve DesignIntroducing
Our New Higher Capacity
Main Valve Design
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
In the highly specialized field of pressurerelief devices, no manufacturer can matchthe diversified products and experience of Anderson, Greenwood. With more designs than any other worldwide manu-facturer, Anderson Greenwood’s producttechnology solves applications from themost severe problem to very basic serviceconditions. These designs include a hightemperature metal seated pilot valve, pre-mium performance spring operatedvalves, API 526 flanged conventional and
balanced bellows valves and an extensiveiron and bronze product range. In additionto our well-known product quality, ISO9001 certifications have been awarded toboth our Stafford, Texas, and Manchester,England, manufacturing plants, ensuringthe ability to deliver products that meetcustomers’ precise requirements well intothe 21st century and beyond.
ANDERSON GREENWOODflow control
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Anderson Greenwood is the established and consistent leader in pilotoperated, pressure relief valve technology.More than three decades of pilot valve experience enables us to produce, supply,and support safety relief valves that:
• assure leak-free system operation veryclose to PRV set pressure
• relieve consistently within code tolerances
• reseat bubble-tight after a short andstable blowdown
• operate through many relief cycleswithout maintenance
This catalog is divided into three primaryparts, which provide step-by-step instruc-tions that make it easy for you to select avalve type, determine the proper orificearea, and order the valve.
Part 1, Selection, helps you determine the type of valve that best suits your application.
Part 2, Sizing, provides the informationyou need to choose the correct valve ori-fice area. (Sizing is actually part of valveselection, but since sizing is such an im-portant factor in selection, a separatesection is provided to help you make theproper choice.)
Part 3, Ordering, explains how to selectand order the specific model number, afteryou have chosen the appropriate valvetype and size.
UseApplication Guide
(Page 4)
Selection (to narrow your choice)
UseSizing Formulas
(Page 23)
ReviewOrifice Areas
(Page 30)
ReviewSizing Factors(Pages 24 - 29)
Sizing (to identify orifice size required)
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
• Soft Seat Design. Provides repeatablebubble-tight performance before andafter each relief cycle.
• Metal-to-Metal Seat Design. Providespilot valve performance in high temper-ature service.
• Bubble-tight Seats Near Set Pressure.Allows higher system operating pres-sure and, therefore, maximum processoutput; not as sensitive to vibrationaland pulsating service; reduces productloss.
• Pop Action Available. No main valvethrottling, which helps prevent freeze-ups in cryogenic or refrigerant typeservices.
• Modulation Action Available.Minimized product loss per relief situa-tion; reduced environmental pollution;avoids oversizing consequences; notas sensitive to inlet pressure losses aspop action.
• Field Test Connection. Quick simpleverification of set pressure while valveremains in service.
• Balanced Design. Lift not affected byback pressure; no expensive and frag-ile bellows required as with directspring valves.
• Externally Adjustable Blowdown.Allows blowdown adjustment with valvein service; no costly removal of valve orsystem shutdown required.
• Patented, Piston Wedge Ring.Prevents resonant chatter; no resultantsevere valve damage, lost product orhazard to personnel.
• Full Lift at Set Pressure. No overpres-sure required for full lift; allows D.O.T.installation to be set higher thanMaximum Allowable OperatingPressure (MAOP) when pop action isused.
• Replaceable Soft Seats and Seals.All seats and seals are easily andquickly renewable; no expensive, time-consuming lapping required.
Why Specify PilotOperated Pressure ReliefValves?
• Reduced Installation Costs
• Reduced Product Loss
• Increased Production Levels
• Reduced Maintenance Costs
• Reduced Environmental Pollution
• Increased Operating Income
Features and Benefits
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Higher Maximum Set PressuresAnderson Greenwood’s POPRVs are ableto operate at considerably higher set pres-sures than is possible with conventionalSRVs. In some cases one POPRV can re-place five conventional SRVs therebyconsiderably reducing capital and installation costs.
Lower Height ProfileBecause the Anderson GreenwoodPOPRV does not use a spring to hold the main valve seat closed, considerableheight savings are achieved in the valvedesign. The same pilot valve is used for all main valve sizes providing significantheight saving particularly on larger andhigher pressure valves. This enables thePOPRVs to be used in situations wherespace is at a premium.
Weight SavingsAs valve size and set pressure increases,a larger spring is needed to keep the seat of a conventional SRV closed — increasing the weight of the valve. Signifi-cant weight savings are provided by theAnderson Greenwood POPRV, whichuses system pressure via the pilot valve to maintain seat tightness. These weightsavings allow cost reductions on plantconstruction and, in particular, on offshoreoil and gas platforms.
Max. Set Pressure Comparison
Valve Orifice Area Direct Spring Anderson Greenwood in [mm] in2 [cm2] Operated, psig [barg] Pilot Operated, psig [barg]
8 x 10 Full Bore38.96 [251.37] N/A 1480+ [102.0+]
[200 x 250 Full Bore]
8T10 26.00 [167.75] 300 [20.7] 1480+ [102.0+]
6R8 16.00 [103.23] 300 [20.7] 1480+ [102.0+]
4P6 6.38 [41.16] 1000 [69.0] 3705+ [255.5+]
3K4 1.83 [11.86] 2220 [153.1] 3705+ [255.5+]
Height Comparison
Valve Rating Direct Spring Anderson Greenwood Heightin [mm] Operated, in [mm] Pilot Operated, in [mm] Saving
8 x 10150# 57 [1448] 30 [762] 47%
[200 x 250]
6 x 8[150 x 200]
300# 43 [1092] 26 [660] 40%
4 x 6300# 37 [940] 23 [584] 38%
[100 x 150]
3 x 4[80 x 100]
600# 34 [864] 20 [508] 41%
2 x 3600# 23 [584] 19 [483] 19%
[50 x 80]
Weight Comparison
Valve Rating Direct Spring Anderson Greenwood Weightin [mm] Operated, lb [kg] Pilot Operated, lb [kg] Saving
8 x 10150# 750 [340.9] 421 [191.4] 44%
[200 x 250]
6 x 8[150 x 200]
300# 480 [218.2] 264 [120.0] 45%
4 x 6300# 230 [104.5] 160 [72.7] 30%
[100 x 150]
3 x 4[80 x 100]
600# 160 [72.7] 92 [41.8] 42%
2 x 3600# 70 [31.8] 53 [24.1] 24%
[50 x 80]
Features and Benefits
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Set Pressure Valve Seriespsig [barg] 200 400 500 700 800
15 – 720 [1.03 – 49.64]1 X
15 – 1480 [1.03 – 101.97] X
25 – 6170 [1.72 – 413.70]3 X
50 – 1200 [3.45 – 82.74] X
1481 – 6170 [102.12 – 425.42] X
Valve Action
Pop X X
Modulating X X X
Service
Gas/Vapor X X X X X
Liquid2 X X X
Steam X X
Process Temperature, °F [°C]
Ambient to +1000 [Ambient to +538]4 X
-65 to +500 [-54 to +260] X
-423 to +500 [-252 to +260] X
-65 to +515 [-54 to +268] X
-40 to +400 [-40 to +205] X
Notes
1. 11⁄2-inch x 3-inch [40 x 80 mm] Type 546has 25 psig [1.72 barg] minimum set.
2. Use Type 249, 259, 269 for cryogenic liquid(set pressure range for this valve type is 25to 1440 psig [1.72 to 99.3 barg]).
3. Higher pressures available on special order.
4. Higher temperatures available on special order.
5. Not all valves are available for service at the extreme limits for both temperature and pressure simultaneously.
How to Select a Valve Type
To determine which pilot operated safetyrelief valve type is most appropriate foryour application, please use the followingguidelines:
1. In the Application Guide (below), notewhich valve types seem most appropri-ate for your application.
2. Read the associated descriptive andoperating information in the catalogdedicated to that type of valve (Series200, 400, 500, 700 or 800).
3. Using the formulas in Part 2, Sizing(page 25), determine the required orifice area for your service conditionsand select the orifice area that suitsyour application.
4. If you have been able to determine apilot operated valve type and orificearea that suits your application, refer to Part 3, Ordering (page 33), to selectand order a specific model number. Ifyou were not able to find a valve typeto meet your application needs, pleasecontact your Anderson Greenwoodrepresentative, or our factory direct, for assistance.
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Anderson Greenwood’s Series 200 popaction, safety valve, with non-flowing pilot,provides system overpressure protectionyou can count on. Since its 1966 introduc-tion, it has been continuously refined andremains the standard against which allother pilot operated valves are compared.This valve is well suited for gas, vapor,and most mixed phase services, includingdirty and/or wet services. The Series 200is available with effective orifice areas of0.110 through 38.96 inch2 [0.710 through251.3 cm2], valve inlet sizes 1-inchthrough 8-inch [25 mm through 200 mm],set pressures from 25 to over 6000 psig[1.72 to over 413.7 barg], and continuousservice temperatures from -423°F to+500°F [-253°C to +260°C].
Features and Benefits• Balanced Design. Proper valve opera-
tion and lift are unaffected by backpressure. Costly and fragile metal bel-lows are not required.
• Ease of Adjustment. Adjustment forset pressure allows accurate and de-pendable setting. Externally adjustableblowdown, reducing costly removal ofvalve or system downtime.
• ASME Section VIII Code Stamp.Certified National Board capacities forgas service assures user of indepen-dent third party flow rate verification.
• Reduced Maintenance Cost. Softseats greatly extend service life, mak-ing costly and time consuming metalseat lapping unnecessary.
• Suited for Dirty or Wet Service.Non-flowing pilot minimizes entrance ofdirt and formation of hydrates in thepilot. Due to low velocities within thepilot and supply tubing, most particleswill drop out upstream of pilot inletscreen. Optional cartridge type pilot fil-ter is available for extremely dirtyservices.
• Increased System Output. Becauseof total valve tightness to at least 95percent of set pressure, the systemcan be operated nearer set pressurewithout valve leakage, resulting ingreater system throughput.
• Unique Field Test Capability. Thisoption allows accurate set pressureverification with valve in service. Nosystem isolation block valve or rupturedisc required.
• Vertical Pilot Mounting. Ensures consistent set pressure and blowdown,as contrasted to erratic, horizontallymounted pilots.
• Reduced Product Loss and Pollution.Soft seats for premium tightness be-fore and after relief cycles.
• Rugged Bracket Pilot Mounting.Extremely rigid mounting protectsagainst vibration and careless han-dling. Shake table proven.
• Full Lift at Set Pressure. AllowsD.O.T. installation to be set higher than Maximum Allowable OperatingPressure (MAOP), resulting in in-creased system throughput.
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
OperationIn the normal closed position, full systempressure is sensed at the pressure pick-up in the main valve inlet. This pressure is transmitted through the pilot and intothe dome (volume above the main valvepiston). Because the piston seal area isgreater than the main seat sealing area,the net force on the piston is downward,keeping the valve tightly closed. Thehigher the system pressure, the greaterthe downward force on the piston —exactly the opposite of direct spring operated valves.
When the pilot senses set pressure, its re-lief seat snaps open and the blowdownseat snaps closed simultaneously, ventingthe dome pressure through the pilot reliefseat to atmosphere. This allows the mainvalve to open fully at set pressure. Theblowdown seat is held tightly closed duringthe relief cycle until the desired systemblowdown is achieved, at which time theblowdown seat snaps open and the reliefseat snaps closed simultaneously. Thisfully repressures the dome to systempressure and closes the main valve.
The valve reseat pressure is dependentupon the lift of the spindle off the reliefseat. Higher spindle lift results in morespring compression and a higher spindleclosing force stored in the pilot spring. Thehigher the lift, the shorter the blowdown(higher valve reseat pressure). The spin-dle lift and thus blowdown are externallyadjustable by raising or lowering the blow-down assembly of the pilot, thus changingthe spindle travel.
Specifications• Non-flowing pilot.
• Replaceable main valve seat locatedon piston to take wear.
• Pilot mounted on severe duty bracket.
• Vertical pilot mounting.
• Externally adjustable blowdown.
• Options, such as auxiliary filter, spikesnubber, and unloader mounted onmain valve with severe duty brackets.
• Field replaceable main valve nozzle.
Series 200 Specifications
Pressure
Pressure
Do
wn
Fo
rce
on
Mai
n V
alve
Pis
ton
0 Set
Mai
n V
alve
Pis
ton
Lif
t
0 Set
Clo
sing
Ope
ning
100% Lift
3% MinimumBlowdown
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
The Series 400 modulating valve, withnon-flowing pilot, incorporates an ad-vanced design in pilot operated valves.Under process conditions, both pilot andmain valve can be tight as high as 98 per-cent of set pressure. The main valve liftsproportionally, according to demand, re-stricting product loss to only that whichmust be relieved to prevent process pres-sure from exceeding the code allowance.
The Series 400 valve is well suited for gasand/or liquid services, including dirtyand/or wet services. The modulating ac-tion is strongly preferred for liquid reliefbecause it eliminates the destructive ef-fects of ‘liquid hammer.’ The Series 400valve is available with the following: effective orifice areas of 0.110 through38.96 inch2 [0.710 through 251.3 cm2]valve inlet sizes 1-inch through 8-inch [25 mm through 200 mm], set pressurebetween 15 and 1480 psig [1.03 and102.0 barg], and continuous service tem-peratures from -65°F to +500°F [-54°C to+260°C].
Features and Benefits• Unique Field Test Capability. Allows
accurate set pressure verification withvalve in service. No system isolationvalve or rupture disc required.
• Reduced Product Loss andPollution. Soft seats for premium tightness before and after relief cycles.Modulating action relieves minimumproduct to prevent overpressure.
• ASME Section VIII Code Stamp.Certified National Board capacities for both gas and liquid service assuresuser of independent third party flowrate verification.
• Suited for Dirty or Wet Service.Non-flowing pilot minimizes entranceof dirt and formation of hydrates inpilot. Due to low velocities within thepilot and supply tubing, most particleswill drop out upstream of pilot inletscreen. Optional cartridge type pilot fil-ter is available for extremely dirtyservices.
• Rugged Bracket Pilot Mounting.Extremely rigid mounting protectingagainst vibration and careless han-dling. Shake table proven.
• Reduced Noise. Modulating actionminimizes flow and resultant noise during normal system upset, reducingnoise abatement costs.
• Increased System Output. Becauseof valve tightness to 98 percent of setpressure, the system can be operatednearer set pressure without valve leak-age, resulting in greater systemthroughput.
• Reduced Maintenance Costs. Softseats greatly extend service life, mak-ing costly and time-consuming metalseat lapping unnecessary.
• Ease of Adjustment. Single adjust-ment for set pressure allows accurateand dependable setting.
• Balanced Design. Proper valve operation and lift are unaffected by back pressure. Costly and fragile metalbellows are not required.
* Patent Protected
Series 400* Modulating Valve
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
OperationWith no system pressure, the pilot inletseat is open and the outlet seat is closed.As pressure is admitted to the main valveinlet, it enters the pilot through a filterscreen. Pressure is then transmittedthrough passages in the feedback piston,past the inlet seat, into the main valvedome, which causes the main valve pistonto remain closed.
As system pressure increases and ap-proaches valve set pressure, it actsupward on the sense diaphragm, with thefeedback piston also moving upward toclose the inlet seat. This seals in the mainvalve dome pressure, since the outlet seatis also closed. A small, further increase insystem pressure opens the outlet seat,partially venting the main valve domepressure. This reduced dome pressureacts on the unbalanced feedback piston toreduce feedback piston lift, tending to‘lock in’ the dome pressure. Thus, at anystable inlet pressure, there will be no pilotflow (i.e., zero leakage).
As inlet pressure rises above set pres-sure, dome pressure reduction will providemodulating action of the main valve pistonproportional to the process upset. Thespool/feedback piston combination willmove, responding to system pressure, to alternately allow pressure in the mainvalve dome to increase or decrease. Thismoves the main valve piston to the exactlift that will keep system pressure constantat the required flow. Full main valve lift,and therefore full capacity, is achievedwith relatively little overpressure. As system pressure decreases below setpressure, the feedback piston movesdownward and opens the inlet seat to admit system pressure to the dome. Thiscloses the main valve. Due to the ex-tremely small pilot flow, the pilot ongas/vapor valves normally discharges to atmosphere through a weather and bug-proof fitting. Pilots for liquid service valveshave their discharge piped to the mainvalve outlet.
Below Set Pressure With Main Valve Closed
Pressure
Mai
n V
alve
Pis
ton
Lift
Set
Clo
sing
100% Lift
Ope
ning
Pressure
Dow
n F
orce
on
Mai
n V
alve
Pis
ton
0 Set
95% Set Pres.,Minimum
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
The Iso-Dome accessory for the 400 pilotprovides protection of the critical pilot inter-nals from the process media. The pilot isactuated by the process fluid and is ASMESection VIII Code stamped for gas and liquidservice. The Iso-Dome 400 pilot is availablewith the following: effective orifices areas of0.110 through 38.96 inch2 [0.710 through251.3 cm2 ], valve inlet sizes 1-inch through8-inch [25 mm through 200 mm], set pres-sure between 15 and 1480 psig [1.03 and102.1 barg], and continuous service temper-ature from -65°F to +500°F [-54°C to+260°C].
Features and Benefits• Critical Pilot Internals and Main
Valve Dome Protected from ProcessMedia. Expands the application of pilotoperated valve technology.
• Valve is Fail-safe. Meets ASME coderequirements.
• Allows System Operating Pressureto be Near Set Pressure. SRV tight-ness is maintained, resulting in greatersystem throughput.
• All Adjustments are Factory Sealed.Just add the clean gas supply for simpleand inexpensive field installation.
• Valve Operation Insensitive to BackPressure. Costly and fragile metal bel-lows not required.
• Unique Field Test Capability. Setpressure may be verified while valve re-mains in service protecting the system.No system isolation valve or rupture discrequired.
* Patent Protected
Iso-Dome* Series 400 Valve
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
The Anderson Greenwood Series 500 is aunique soft seated safety relief valve de-signed to handle higher temperatures. Itwas created with a specific design objec-tive: to decrease the leakage associatedwith metal-seated safety relief valvesunder extreme operating temperature con-ditions.
The result is a modulating, soft-seated, pilot operated valve offering premiumtightness with the ability to handle temper-atures from -65°F to 515°F [-54°C to268°C] and a set pressure range of 15 to 720 psig [1.03 to 49.6 barg].
The soft seat in the Series 500 main valveis more resistant to particulate damagethan a metal seat, has a longer servicelife, and can be quickly replaced while thevalve body remains installed in the line.
Its unique design enables the main valveto be tight at pressures up to set point.After relieving and reseating, it stays bub-ble-tight, cycle after cycle. Applications forthe Series 500 include hot water, steam(ASME section VIII Unfired PressureVessels), hot hydrocarbon vapors or liq-uids, and corrosive services.
Features and Benefits• Reduced Product Loss and
Pollution. Soft seats for premium tight-ness before and after relief cycles.
• All Teflon® Soft Goods. All seats andseals are Teflon® providing additionalchemical compatibility with the ladingfluid.
• Increased System Output. Becauseof total valve tightness to at least 95percent of set pressure, the systemcan be operated nearer to set pressurewithout valve leakage. The result isgreater system production capability.
• Reduced Maintenance Costs.Resilient seats greatly extend servicelife. Costly and time consuming metalseat lapping is unnecessary.
• Balanced Design. Proper valve opera-tion and lift are unaffected by backpressure. Costly and fragile metal bel-lows are not required.
• ASME Section VIII Stamp. CertifiedNational Board capacities for steam,gases, and liquids assures user of in-dependent third party flow rateverification.
• Unique Field Test Capability. Allowsaccurate set pressure verification withvalve in service. No system isolationvalve or rupture disc is required. Singleindicator button is available.
• Reduced Noise. Modulating actionminimizes flow and resultant noise during normal system upset reducingnoise abatement costs.
• Ease of Adjustment. Adjustment forset pressure allows accurate and de-pendable setting.
Note
1. Teflon® is a registered trademark of the E. I.duPont de Nemours Company.
Series 500 Soft Seated Valve
OperationIn normal operation, the system pressureacts on the area contained by the mainvalve seat at the bottom of the free-float-ing differential area piston and on the topof the piston. Since the top of the piston is larger than the bottom (seat area), thereis a large downward net force holding thepiston closed. Under static conditions, theseating force increases as the systempressure increases and approaches setpoint.
When the set pressure is reached, the pilot opens and partially depressurizes thedome. This reduces the force on the top ofthe piston to the point where the upwardforce on the seat area can overcome thereduced downward loading. This causesthe piston to lift, resulting in modulatedflow through the main valve.
When the relief demand has been satis-fied, the pilot closes, full system pressureis diverted to the dome, and the pistonmoves downward, closing the main valve.
A patented, pressure responsive pistondrag system in the larger Series 500valves eliminates resonant chatter and the severe valve and/or piping damage it can cause. The wedge ring creates apressure-actuated sliding friction force between the piston and liner, preventingresonant chatter.
Specifications• Durable but replaceable Teflon® seat
in main valve, located on piston to takethe wear. A totally captive seat designeliminates seat extrusion at elevatedtemperatures.
• Teflon® seals throughout main valveand pilot for optimum chemical resis-tance, such as needed for variouschemicals in boiler feed water.
• Dual diaphragm pilot for minimum firstleak-to-relief pressure.
• Single point set pressure adjustment.
• Flowing style pilot for even warm-up ofpilot as system pressure approachesset pressure, resulting in consistent op-timum performance.
• Indicator button for field test capability.
• Field replaceable main valve nozzle.
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
The Series 700 pilot operated safety valveis unique as an all metal seated pilot andmain valve. This extends the use of pilot technology to temperatures up to1000°F [538°C]. The valve is suitable forsteam and/or gas service. The Series 700is available with effective areas of 0.503through 26.00 in2 [3.245 through 167.7cm2].
Features and Benefits• All Metal-to-Metal Seating Surfaces.
Trim specifically designed for hightemperature service, plus enhancedchemical compatibility.
• Patented Flexible Disc. Reduces impact wear while increasing seattightness.
• Dampened Trim. Dampening cham-bers control the opening and closingresponse, increasing valve cycle life.
• Non-Flowing Pilot. Reduces seatwear and minimizes entrance of dirtand particulates in the pilot.
• Adjustable Blowdown. Blowdowncan be adjusted between 3% and 15%by turning the blowdown adjustmentsleeve. Upper and lower blowdownrings and pins are not required, savingtime, parts and costs.
• ASME Section VIII Code Stamp.Certified National Board capacities forsteam and gas service assures user ofindependent third party flow rate verifi-cation.
• Unique Field Test Capability, this op-tion allows accurate set pressureverification with valve in service. Nosystem isolation block valve or rupturedisc required.
700 Manifolded Dual Pilots*(Optional)• For maximum operating conditions, it
is recommended to use dual pilots withbuilt-in switching mechanism.
• The safety lock allows the operator toisolate only one pilot while the activepilot protects the system.
• In-service testing and replacement ofpilot under operating condition with fullsystem protection.
* Patented
Series 700 Safety Valve
Dual Pilots
Manifold
Changeover valves
Safety lock
Field test connection
Series 700 Specifications
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
OperationSteam ServiceIn the closed position, when operatingbelow set point, the valve internal pressureis equal to the system pressure and the pis-ton is pressure balanced.
System pressure is directed to three keyareas of the valve:
1. The Dome, via the dome charging ori-fice;
2. The Pilot, via the integral pressure sens-ing connection and the external pilot inletsensing line; and
3. The Unloader, via the sensing line con-nections from the pilot dome and theintegral sensing connection from thedome through the cap.
The seating force is produced by systempressure acting on the internal exposeddisc surface area. As system pressure in-creases, the seating force increasesproviding maximum seat tightness up to setpoint when the valve opens.
When system pressure reaches set pointand overcomes the pilot spring force, thepilot pops open and sets into motion fourkey reactions:
1. The normally open reseat piston movesinto full lift and closes against the blow-down seat preventing further systempressure from flowing through the pilot.This is the non-flow pilot feature.
2. Unloader dome pressure is ventedthrough the pilot vent to atmosphere. Withthe internal pilot pressure relieved, thepilot spring is now sensing system over-pressure in the pilot inlet sensing line viathe spindle-disc-spacer rod-reseat piston.
3. The venting of unloader dome pressurecreates a pressure imbalance whichopens the unloader piston. Main domepressure is now being vented into thevalve outlet, and the pressure drop back-seats the drain plunger, preventingsystem pressure from charging the dome.
Blowdown Seat (Closed)
Relief Seat(Open)
Unloader PistonUnloader Dome
Spacer
Pilot Disc
System Pressure
Piston
Pressure Sensing (Integral)Main Valve
BlowdownSeat (Open)
Relief Seat(Closed)
Pilot Vent
Disc
Nozzle
Dome
Pilot
Unloader
Dome Charging Orifice
System Pressure
Drain Plunger
Normal Closed Position
Relieving Position
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
4. The depressurization of the piston domepressure produces a pressure imbalancewhich moves the piston/disc assemblyoff the nozzle seat. As the media beginsto exit through the valve outlet, thedownstream disc surface area is sub-jected to system overpressure and thepiston/disc assembly goes into full lift in-stantaneously.
When system overpressure has been fullyrelieved, the pilot spring closes the pilotdisc onto the relief seat. The valve nowgoes into the blowdown phase and setsinto motion the above mentioned four keyreactions in reverse:
1.The pilot disc-spacer rod pushes the re-seat piston off the blowdown seat andthe internals of the pilot spring-spindle-disc assembly are once again sensingsystem pressure.
2.With the pilot closed and the pilot ventisolated, system pressure is now di-rected to the unloader dome.
3.Recharging the unloader dome causesthe unloader piston to close and stopsthe depressurization of the piston domepressure.
4.System pressure is now charging thepiston dome via the dome charging ori-fice. The pressure imbalance is nowclosing the piston/disc assembly.
With the main disc closed and outlet pres-sure on the disc eliminated, the systempressure acting on the internal exposedarea of the disc once again re-establishesmaximum seat tightness.
Air, Gas or Vapor ServiceFor air, gas and vapor service, the assem-bly of the main valve and pilot is modifiedas follows:
1.The unloader is deleted and the pilotdome connected directly to cap.
2.The unloader discharge port in the valveoutlet is plugged.
3.The dome charging orifice in the pistonis deleted.
4.A snubber is installed at the pilot inlet todampen system pulsations.
The operation of the main valve and pilotin air, gas and vapor service is the sameas the steam valve.
The pilot is able to vent and depressurizethe main dome with sufficient speed toprovide proper opening and closing perfor-mance without the use of an unloader.
For mixed phase flow, consult the factoryto determine if unloader is required.
Series 700 Operation
Piston
Pressure Sensing (Integral) Main Valve
Snubber
BlowdownSeat (Open)
Relief Seat(Closed)
Pilot Vent
Disc
NozzleDome
Pilot
System Pressure
Drain Plunger
Normal Closed Position
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
The Series 800 modulating valve utilizesthe most advanced design in pilot operatedvalves. The non-flowing, modulating pilotcan be set at pressures up to 6170 psig[425.52 barg]. Under these process condi-tions, the pilot and main valve can be tightup to 98 percent of set pressure.
Since the pilot is modulating, the mainvalve lifts proportionally according to de-mand, restricting product loss to only thatwhich needs to be relieved to prevent theprocess pressure from exceeding thecode allowance. The pilot provides stablelift even on hard liquid systems due to itsunique trim. The 800 Series can also beused in gases or mixed phase lading flu-ids, including dirty and/or wet services.
The Series 800 valve is available with thefollowing: effective orifice areas of 0.110through 9.489 in2 [0.710 through 61.21cm2], valve inlet sizes 1-inch through 4-inch [25 mm through 100 mm], set pres-sures between 1481 and 6170 psig[102.13 and 425.52 barg], and continuoustemperatures from -40°F to +400°F [-40°Cto + 205°C].
Features and Benefits• High Set Pressure Capability.
Provides modulating, non-flowing pilotvalve performance to 6170 psig[425.42 barg].
• Unique Field Test Capability. Allowsaccurate set pressure verification withvalve in service with minimal amount of test gas.
• Reduced Product Loss andPollution. Soft seats for premium tight-ness before and after relief cycles.Modulating action relieves minimumproduct to prevent overpressure.
• ASME Section VIII Code Stamp.Certified National Board capacities forboth gas and liquid service assuresuser of third party flow rate verification.
• Suited for Dirty or Wet Service.Non-flowing pilot minimizes entrance ofdirt and formation of hydrates in pilot.Due to low velocities within the pilotand supply tubing, most particles willdrop out upstream of pilot inlet screen.Optional cartridge type pilot filter isavailable for extremely dirty services.
• Rugged Bracket Pilot Mounting.Extremely rigid mounting protectsagainst vibration and careless han-dling.
• Reduced Noise. Modulating actionminimizes flow and resultant noise during normal system upset, reducingnoise abatement costs.
• Increased System Output. Becauseof valve tightness to 98 percent of setpressure, the system can be operatednearer set pressure without valve leak-age, resulting in greater systemthroughput.
• Ease of Adjustment. Single adjust-ment for set pressure allows accurateand dependable setting.
• Reduced Maintenance Costs. Softseats greatly extend service life, mak-ing costly and time-consuming metalseat lapping unnecessary.
• Balanced Design. Proper valve operation and lift are unaffected by back pressure. Costly and fragile metalbellows are not required.
Series 800 Modulating Valve
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
OperationWith no system pressure, the pilot inletseat is open and the outlet seat is closed.As pressure is admitted to the main valveinlet, it enters the pilot through a filterscreen. Pressure is then transmittedthrough passages in the feedback piston,past the inlet seat, into the main valvedome, which causes the main valve pistonto remain closed.
As system pressure increases and ap-proaches valve set pressure, it actsupward on the sense O-ring seal, with the feedback piston moving upward toclose the inlet seat. This seals in the mainvalve dome pressure, since the outlet seatis also closed. A small, further increase insystem pressure opens the outlet seat,partially venting the main valve domepressure. This reduced dome pressureacts on the unbalanced feedback piston to reduce feedback piston lift, tending to‘lock in’ the dome pressure. Thus, at anystable inlet pressure, there will be no pilotflow (i.e., zero leakage).
As inlet pressure rises above set pres-sure, dome pressure reduction willprovide modulating action of the mainvalve piston proportional to the processupset. The spool/feedback piston combi-nation will move, responding to systempressure, to alternately allow pressure inthe main valve dome to increase or de-crease. This moves the main valve pistonto the exact lift that will keep system pres-sure constant at the required flow. Fullmain valve lift, and therefore full capacity,is achieved with relatively little overpres-sure. As system pressure decreasesbelow set pressure, the feedback pistonmoves downward and opens the inlet seatto admit system pressure to the dome.This closes the main valve. The pilot ex-haust is always piped to the main valveoutlet.
Series 800 Operation
Main Valve
Dome
Tubed to MainValve Outlet
Sense Seal
Pilot Outlet Seal
Pilot Inlet Seal
Below Set Pressure With Main Valve Closed
Tubed to MainValve Outlet
FeedbackPiston
At or Slightly Above Set Pressure Main Valve Partially Open andModulating
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Valves are selected on the basis of theirability to meet an expected relieving con-dition, flowing a sufficient amount of fluidto prevent excessive pressure increase.This means that the size of the valve orifice must be calculated taking the required flow, performance characteris-tics, lading fluid properties, and otherfactors into consideration.
The sizing procedure presented utilizesthe recommended practice of API 520Part I. The valve orifice areas and nozzledischarge coefficients shown are effectivevalues in that they are not specific to aparticular valve type. The use of theseeffective orifice areas and effectivenozzle discharge coefficients will al-ways allow for the selection of a valveorifice area that will meet or exceed therequired capacity.
The calculation of the actual certifiedvalve capacity can be performed with theAnderson Greenwood sizing software pro-gram enclosed in the catalog binder.
To select the minimum required orificearea that will flow the required capacity ofthe system you wish to protect, pleaserefer to the following information which ap-pears in this section:
1. Sizing Formulas
2. Correction Factors
3. Valve Orifice Areas
Once you have determined the requiredorifice area for your service conditions, refer to Part 3, Ordering (page 31), to select a specific valve model number.
How to Size a Valve
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Back Pressure Correction Factor for Series 700 – Gas, Vapor
Note
1. When discharge piping other than the typical90 degree elbow is used, the piping and/orpressure vessel designer must determinethe maximum back pressure to properly select the outlet flange rating.
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Once you have determined the basic type(e.g., Series 200, 400, etc.) of valve re-quired in Part 1 and determined yourrequired orifice area in Part 2, please referto the following information to specify andorder the pressure relief valve best suitedfor your application.
Note: To ensure proper delivery and expedite processing, please include themodel number and any additional informa-tion requested below in all specifications,purchase requisitions, and orders, as applicable.
Constructing A Model NumberTo construct the model number, identifythe seven components on the ValveModel Numbering chart on page 45. Use the resulting assembled numberwhen ordering your valve.
Specifying Other Information for Your OrderThe following information might be re-quired, depending on the type of valveand other requirements:
Special RequirementsPlease specify the details of any specialprocedures you require during valve man-ufacturing.
These might include unlisted accessories,special quality assurance, material trace-ability, non-standard plating and surfacefinishes, non-destructive test require-ments, etc. Include required levels ofinspection and the parties or organizationswho will perform the inspections, if any.Note: Special requirements can impactprice and delivery.
Valve TaggingIf paper tags are requested at the time thevalve is ordered, they will be furnished atno additional cost. Other types of taggingare offered at additional cost. If you wouldlike metallic tags, please identify the spe-cific tag material, and tag numbers whenyou place your order.
DocumentationData submittals are not furnished for or-dered products unless specified. Certainstandard drawings, test reports, and certi-fications are available at no cost, uponrequest.
Packing for ShipmentAll products are packed for normal do-mestic shipment from point of assembly orstocking. Special packaging requirements,such as export boxing, should be speci-fied in your purchase order.
Ordering InformationTo properly process your order and avoiddelay, please specify the following:
• Quantity
• Inlet Size and Flange Rating andFacing (see page 44)
• Outlet Size and Flange Rating andFacing (see page 56)
• Anderson Greenwood Type ModelNumber (see page 45)
• Orifice Size (see page 30)
• Material Requirements (see pages 32 - 43)
– Main Valve Body– Main Valve Trim– Pilot
• Soft Goods (see page 44)
• Set Pressure
• Allowable Overpressure
• Service (Gas, Vapor, Liquid, Steam)
• Temperature (Operating and Relief)
• Operating Pressure
• Back Pressure (ConstantSuperimposed, Variable Superimposedand Built-up)
• Required Relief Capacity
• Molecular Weight (Gas) or SpecificGravity (Liquid)
• Ratio of Specific Heats (Gas)
• Optional Accessories (see pages 46 -50)– Field Test Connection– Field Test Indicator– Manifold Dual Pilot– Backflow Preventer– Pilot Supply Filter– Pressure Spike Snubber– Remote Pressure Sense Connection– Pilot Discharge Tubed to Main Valve
Item Description /S /S1 /S2 /S3Ambient to 1000°F Ambient to 600°F 601°F to 800°F 801°F to 1000°F[Ambient to 538°C] [Ambient to 316°C] [318°C to 427°C] [427°C to 538°C]
1 Body SA351-CF8M SS SA216-WCB CS SA216-WCB CS SA217-WC6 AS
2 Cap SA240-316 SA516-70 SA516-70 SA387-11
3 Nozzle A351-CF8M SS A351-CF8M SS A351-CF8M SS A351-CF8M SS
2. Broad pressure limits pertain only to thematerial. Actual limits for specific valvesizes, valve types, and operating conditionsvary. Consult factory.
4. Viton® maximum temperatures ratings (accumulated):3000 hours at 450°F [232°C]1000 hours at 500°F [260°C]240 hours at 550°F [288°C]48 hours at 600°F [316°C].
5. For other soft goods, please contact factory.
6. Series 500 only.
Notes
Maximum Pressure Rating, psig [barg]
Flange Material Temperature, °F [°C]Class -423 to -21 -20 to 100 200 300 400 500 600 700 800
[-253 to -30] [-29 to 38] [93] [149] [205] [260] [316] [371] [427]
Letter – API Equivalent— – Full Bore (Largest practical orifice area for a given valve inlet size)
Inlet x Outlet, Inches
Main Valve Materials
/S – SS Body and Trim/S1 – CS Body, SS Trim/S2 – CS Body, High-temperature Trim (Series 700 only)/S3 – WC6 Alloy Steel Body, High-temperature Trim (Series 700 only)
/S1/NACE – CS Body and SS Trim Compliance With NACE MR0175S/NACE – SS Body and Trim Compliance With NACE MR0175
/SPL – Special
Note
1. For a full lift valve, the area controlling thevalve capacity is the main valve nozzle bore.For a restricted lift valve, the area controllingthe valve capacity is the ‘curtain area’ be-tween the main valve nozzle and thebottom of the lifted piston.
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
In addition to the beneficial features avail-able through the use of pilot operatedsafety valves, a variety of accessories andoptions are available to provide additionalfunctions. Some simplify the process ofperiodic testing, an important safety re-quirement today. Others assist in thesuccessful operation of the safety valveunder adverse or special applications.
Please refer to the options and acces-sories availability table on page 52. Onrequest, other options may be availablefor some models for special situations,such as position indicators, purge connec-tions, multiple pilots, differential pressuresensing, etc.
A. Field Test Connection:• In-service verification of set pressure.
• Simplifies the periodic testing of safetyvalves.
Anderson Greenwood pilot operatedsafety valves may be readily tested forverification of set pressure during normalsystem operation with this option. FieldTest Connection is an option on mostmodels. The customer furnishes a pres-sure source, plus a test gauge andmetering valve for the portable field test-ing system. When test pressure is slowlyadmitted through a metering valve, thepilot and the main valve dome are pres-surized, simulating an increased systempressure.
When set pressure is reached (pop actionpilots only), the pilot will actuate. This ac-tuation pressure may then be comparedwith the nameplate value. Dependingupon the current system pressure, and the characteristics of the specific pilot, the main valve may also briefly open andclose, or partially open and close, provid-ing verification that the main valve pistonis free to move.
When the Field Test Connection is usedwith the modulating type pilots, the pilotwill begin cracking at a pressure justbelow the nameplate setting. In order toaccurately establish the set pressure, an-other accessory, the Field Test Indicator,is recommended.
B. Field Test Indicator:• Simplifies verification of modulating
pilot set pressures.
• Only one test connection and pressuregauge required.
This is a mechanical indicator, availableonly for modulating pilots, allowing for the accurate verification of set pressure.Since the set pressure of all modulatingsafety valves in this catalogue are definedas the point when the dome pressure isreduced to 70 percent of set pressurewhen system pressure reaches the name-plate setting, the indicator is implemented.This gives positive verification that setpressure has been reached. The verifica-tion process for modulating pilots requiresthis option, in addition to the Field TestConnection.
C. Manifold Dual Pilot:• In-Service Replacement of Pilot.
• Extended Outage Cycle. The MDP isavailable both as an option and as aretrofit kit. The dual cartridge pilots aremanifolded in a miniature safety selec-tor valve which allows for in-servicereplacement of the pilot without shut-ting the system down while maintainingfull system overpressure protection.Also, field test connection and manualblowdown are built into the manifold.
Accessories and Options
A
C
B
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
D. Backflow Preventer:• Prevents accidental reverse flow
through safety valve.
This option, sometimes called a ‘vacuumblock,’ prevents a pilot operated safetyvalve from reverse flow, when sufficientvacuum is present at the inlet flange. Thebackflow preventer also prevents reverseflow when the pressure at the outlet flange(superimposed back pressure) is greaterthan the current system pressure. Reverseflow will occur with any standard type ordesign of pilot operated safety valve, whensufficient reverse differential pressure exists. Reverse flow, should it be inducedby a reverse differential pressure, will beprevented by this option.
All backflow preventers operate by permit-ting the introduction of outlet pressure intothe dome of the main valve, thereby hold-ing the piston firmly onto the nozzle,overcoming the effect of a reverse differ-ential pressure across the safety valve.The option also includes a built-in provi-sion to prevent reverse flow through thepilot that would otherwise pass throughthe pilot supply line, back into the system.
A Backflow Preventer should be specifiedwhenever:
• A vacuum may be present at the inletconnection due to unusual operatingconditions or a temporary vacuum con-dition that may occur under startupconditions.
• The discharge of the safety valve isconnected to a downstream pressurevessel, where pressure may vary fromtime to time, in excess of the pressurein the upstream system.
• The discharge of multiple safety valvesis combined into a single manifold orvent system, creating superimposedback pressures in excess of the currentupstream system pressure.
E. Pilot Supply Filter:• Protects pilot from excessive particu-
late matter in flow stream.
This is a mechanical filter that is availablefor gas and liquid applications where thereis a possibility of large amounts of particu-late matter in the fluid stream. The filter is optional for liquid or gas service for anypilot model. The pilot supply filter will berigidly mounted to the main valve cap.
F. Pressure Spike Snubber:• Overcomes pressure ‘spikes’ in gas
systems, that would cause prematureactuation.
This option may be provided on the Series200 or 400 non-flowing type pilots, only on gas applications. The snubber is rec-ommended for use on pulsating gascompressor applications, where instanta-neous pressure values (pressure spikes)approach or exceed the set pressure andmay cause inadvertent valve actuation.The device acts as a pulsation dampener;consisting of a series of fixed orifices,combined with small volume chambersthat dampen the transient pressure rises.The average static system pressure is unaffected, so no change in set pressureis experienced with this option. The pres-sure spike snubber is compact and ismounted to the main valve cap. Pleasenote that it is to be applied only for gas applications.
For vapor applications, the Series 700non-flowing pilot is supplied with pressurespike snubber as standard.
Accessories and Options
D
E
F
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
• Safety valve will respond to actual system pressure conditions.
• Eliminates undesirable cycling due to excessive inlet pressure losses.
• Improves safety, under adverse operating conditions.
This optional feature permits the pilot tosense system pressure at a location thatmost accurately reflects the actual operat-ing pressure of the protected system. A remote pressure sense connection eliminates the false system pressure indication that will occur during relievingconditions, due to pressure losses in theinlet piping to the safety valve. Most ap-plicable codes recommend that the inletpiping system be designed for a maximumanticipated pressure loss of 3 percent. Ifthis is not possible, the remote pressuresense connection should be specified.
Please note that the addition of a remotepilot sense line allows the pilot to correctlysense system pressure and to keep thevalve from rapid cycling or chattering.With remote sensing the piston type, pilotoperated safety valves described in thiscatalogue will remain stable against theeffects of high inlet pressure loss phe-nomena. However, relieving capacity willbe proportionately reduced wheneverthere is inlet pressure loss to the safetyvalve.
Please note that valves furnished for remote pilot sense, may be converted to integral sense, or vice versa, since the pressure pickup is installed in all instances, and the integral sense connec-tion is closed off with a removable 1/2-inchNPT threaded pipe plug.
H. Pilot Discharge Tubed to MainValve Outlet:
• Eliminates any local venting of fluidmedia from pilot.
This option is desirable when the safetyvalve is within a closed environment andeven the small amount of gas dischargedfrom the pilot is to be avoided. When liq-uid service is specified, the appropriatepilot should be chosen and the factorystandard will be to add this option.
I. Remote Valve Lift Indicator:• Provides remote signal to allow the
plant operator to know when a safetyvalve has operated.
This feature consists of a differential pres-sure switch, actuated when the mainvalve has been operated. The switch isadjusted to sense the difference betweenthe system pressure and the main valvedome pressure. Electrical indication isthen available to a remote location.Furnish full particulars on electrical poweravailable, the switch contact style and rat-ing, the type of enclosure and hazardrating. The switch will be mechanicallymounted to the main valve cap. Externalwiring enclosures are not normally fur-nished.
Accessories and Options
G
H
I
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
J. Manual Unloader:• Permits the safety valve to be opened
to depressurize the system.
• Acts as manual override to normalpressure setting, but has no effect onthe sealed pressure setting.
A manual unloader consists of a smallhand valve connected to the dome line ofthe main valve. Opening of the hand valvevents the dome pressure faster than it canbe recharged by the pilot supply. Sufficientdome pressure reduction results in pistonlift, due to unbalanced forces, simulatingpilot actuation. This option is used to allowthe safety valve to be used, along withother valves, for the emergency reductionof system pressure due to potential safetyhazards. When permitted, the manual un-loader may be substituted for a mechanicallift lever.
K. Pilot Lift Lever:• Permits manual test of safety valve
operation.
This feature is provided for those applica-tions where the mechanical lifting of thepilot is required for verification of valve operation. Lifting of the pilot spindle willpermit the main valve to lift when the sys-tem pressure is at least 75 percent ormore of set pressure. The pilot lift lever ispacked to prevent external leakage. Somesafety regulations and codes require thata lift lever be furnished for air, hot waterover 140°F [284°C] and steam applica-tions.
Remote Unloader:• Permits the safety valve to be remotely
opened to depressurize the system.
This is the same scheme as the manualunloader, except that the unloader valve isremotely operated. Either solenoid orpneumatic operation may be used. Pleasefurnish full particulars of the type of un-loader electro valve to be furnished, andthe desired valve action: normally open orclosed. For solenoid operation, specify thevoltage and current (AC or DC). Furnishthe frequency in Hertz for alternating cur-rent. The type of enclosure, such asexplosion proof, splash proof, corrosionresistant, etc., must also be specified forelectrical operators. Unless otherwisespecified, no separate wiring enclosure isfurnished.
If the remote unloader is supplied, it willbe mechanically mounted to the safetyvalve with the pressure connection to thedome line of the main valve. Venting willbe to the atmosphere through a weatherfitting.
NACE Option:• Essential option for sour gas service.
This is a material option to meet the stresscorrosion problems associated with sourgas service. The materials in both the pilotand main valve will meet the requirementsof NACE MR-01-75.
Accessories and Options
J
K
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Pilot Valve Test Drum:• Simplifies field and maintenance shop
resetting and repair.
This is an option for the shop testing andresetting of the pilot, and is offered forcustomer maintenance and repair shops.It consists of a small accumulator, approx-imately 0.01 cubic meter (0.25 cubic feet)
volume, with the necessary fittings, valvesand test gauges for mounting and testingof the pilot. The test drums are made toorder for the pilot models specified.Please furnish the set pressure range and the pilot models to be tested. Thecustomer furnishes the pressure supply to the accumulator. Tools for adjustingand servicing the pilot are not included.
Supply (System)Pressure Gauge
High PressureNitrogen orAir Supply
MeteringValve
Vent Valve
Test Drum
Pilot Valve
Pilot SupplyLine
Pilot Valve test apparatus used toadjust set pressure and blowdown.
Options and Accessories Availability Table
Accessory/Option Pilot Series200 400 500 700 800
Field Test Connection O N/A O O N/A
Field Test Connection w/Indicator N/A O O1 N/A O
Backflow Preventer O O O N/A O
Remote Pressure Sense Connection O O O O O
Manual Unloader4 O O O O O
Remote Unloader2 O O O O O
Pilot Supply Filter O O O S O
Pilot Lift Lever O O O O O
Pressure Spike Snubber O O3 N/A S7 O3
NACE Trim O O O N/A O
Pilot Discharge Tubed to Main Outlet Valve N/A O5 S N/A S
Remote Valve Lift Indicator6 O O O O O
Manifolded Dual Pilots N/A N/A N/A O N/A
Notes
Option Codes: S - Standard
O - Optional: available upon request
N/A - Not available for this model valve.
Materials: Options and accessories will utilizematerials of construction consistentwith those of the main valve and pilotvalve. Consult the factory represen-tative for specific details.
1. This option is recommended wheneverField Test Connection is specified.
2. Furnish full particulars. See option descrip-tion on page 49.
3. Gas service only.
4. The effective Cv of the unloader shall be atleast 0.4 (Kv = 0.35), including any associ-ated tubing or piping.
5. When liquid service is specified, this optionis standard.
6. Furnish complete details on type of signaloutput desired and power supply available.
7. Standard for vapor service.
Anderson Greenwood POPRV CatalogSeries 200, 400, 400 Iso-Dome, 500, 700, and 800
Valve Outlet Flange Rating1 Maximum Set Pressurepsig [barg]
API Orifice 2J3 300# 5475 [377.5]
API Orifice 6R8 150# 1200 [82.7]
API Orifice 8T10 150# 1175 [81.0]
Full Bore 11⁄2FB2 300# 2500 [172.4]
Full Bore 2FB3 150# 1150 [79.3]
Full Bore 3FB4 150# 723 [49.9]
Full Bore 4FB6 150# 1225 [84.5]
Full Bore 8FB8 x 8 150# 1400 [96.5]
Full Bore 8FB10 150# 4502 [31.0]
Outlet Flange Ratings
When pressure relief valves are used with discharge tailpipes or are piped todischarge headers, the PRV outlet flangerating must be selected based on thepressure at the flange during a relief cycleor other worst-case condition.
The valves listed in this catalogue showinlet/outlet flange combinations suitable
for valves discharging direct to the atmos-phere through a tailpipe with an L⁄D ratio of 15, set at the maximum, 100°F [38°C],inlet flange pressure rating or the pressure limits shown below. A tailpipe with a longradius, 90 degree elbow and 12-inch ofstraight pipe has a L⁄D ratio of approxi-mately 15.
1. Higher rated outlet flanges are available forhigher set pressures.
2. This limit is for steam only. Otherwise, themaximum set pressure is the same as forthe inlet flange rating.
Note: Pressure limits are for CS bodied valves.SS valve ratings are 97% of those shown.
Notes
Pilot Operated Pressure Relief Valve CatalogRevised July 1998Catalog: POPRV-US.96