Key benefits l Ease of integration - valve size matches pipe size, resulting in reduced installation time and installation costs l Flexible design - ports can be configured to suit installation l Low pressure drop - compared to other valve types l Small physical size l Hand wheel allows manual adjustment of valve (optional on pneumatic valve) - simplified set up and maintenance Typical applications For engines, turbines, gearboxes and heat exchangers: l Charge air cooling l Secondary cooling systems l Fuel and lube oil preheating l Co-generation l Engine jacket water For refineries, chemical plants and oil reproduction: l Waste heat boilers l Product coolers l Product heaters l Product condensers Electric G valve Pneumatic G valve 3-Way Temperature Control Valves now even more compact Model G and Accessories DS_AM_G_0910 www.amot.com G valve compared with a typical equivalent competitor’s specification.
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Key benefits
lEase of integration - valve size matches pipe size, resulting in reduced installation time and installation costs
l Flexibledesign-portscanbeconfigured to suit installation
lLow pressure drop - compared to other valve types
lSmall physical size
lHand wheel allows manual adjustment of valve (optional on pneumatic valve) - simplifiedsetupandmaintenance
Typical applications
For engines, turbines, gearboxes and heat exchangers:
lCharge air cooling
lSecondary cooling systems
lFuel and lube oil preheating
lCo-generation
lEngine jacket water
For refineries, chemical plants and oil reproduction:
lWaste heat boilers
lProduct coolers
lProduct heaters
lProduct condensers
Electric G valve
Pneumatic G valve
3-Way Temperature Control Valves
now even more
compact
Model G and Accessories
DS_AM_G_0910 www.amot.com
G valve compared with a typical equivalent competitor’sspecification.
AMOT G valves are 3-way control valves consisting of a heavy duty rotary valve and either a quarter turn electric or pneumatic actuator.Thevalvesprovideahighdegreeof accuracy and repeatability for accurate temperature control and are equally accurate inmixingordivertingserviceoverawideflowrange.
The heavy duty rotor design provides tight temperature control without high maintenance requirements.Thesystemisavailableinthreestandardcontrolconfigurations:electric;pneumatic;andelectro-pneumatic,offeringflexibilityformostrequirements.Designed
for high vibration service, the AMOT G valves arequalifiedtoLloyd’sMarineRequirementsforshipboardservice.Valvescanbedirectlymounted to reciprocating machinery, such as dieselengines,withoutvibrationisolation.The heavy duty actuators are specially reinforced to providevibrationresistance.
The standard valves are suitable for a variety offluidssuchaswater,water/glycol,seawater,lubricatingandhydraulicoils.Optionalbodymaterials are available for services involving synethicorfireresistantoils,deionizedwaterandammoniaorfreoninoil.
Applications
Overview
Charge Air Temperature ControlThe intercooler is used to cool high temperature turbochargerair.
In this application the G Valve regulates the flowofcoolingwaterthroughanintercooler,increasingefficiency,enhancingperformanceand helping to meet today’s environmental requirements.Charge
aircooler
RTD
Charge air
Diverting Applications
Jacket water cooling in diverting applications regulates the outlet coolant water temperature fromadieselorgasengine.Thevalveeithersends water to a cooler or bypass loop, accuratelymaintainingthetemperature.
The temperature is normally measured at the outletfromtheheatsource.
Heatremoval
Heatload
Pump
RTD
Mixing Applications
Lubricating oil temperature control is normally configuredinamixingapplicationcontrollingthereturntemperaturetotheheatload.Thetemperature is normally measured as close as possibletothesumpreturn.
Heatremoval
Heatload
Pump
RTD
3-Way Temperature Control Valves - Model G
page4 DS_AM_G_0910
Electric System
The electric actuator is a rugged, compact and lightweight quarter turn actuator having enclosureprotectiontoIP65.
The actuator is powered by an electric motor drivingaworm-typegearbox.Thewormgearboxpreventsreversedriveduetofluidforces.Itisfittedwithmanualoverrideasstandard,enablingvalveoperationwithoutpower.
Athermalcutoutisfittedpreventingoverheating.Limit switches at each end of stroke disconnect motorpowerwhenendstrokeisreached.Thesecanalsobeusedforremoteindication.
See page 11 for more information on the electric actuator.
G ValvePIDController8071/2D,IP67enclosure
For the electric valve, the actuator of the G valve assembly uses an electric motor which rotates in either direction in response to the ON-OFF signalsreceived.Themotordrivesagearboxconnected to the rotor shaft and turns the valve rotor clockwise or counter-clockwise, a maximum of90degrees.Attheendoftravel,limitswitches are incorporated to isolate the electrical supply to the motor when the valve rotor has reachedeitherendoftherotation.Afeedbackpotentiometer is standard and provides position indicationtothecontrolsystem.
Electric Valve
The electric valve system incorporates the use of an electrically actuated three-way control valve withanelectroniccontroller.The8071DPIDController can be either panel or wall mounted (seepage14formoreinformation).Thesystemis completed with a temperature sensor type 8060(seepage16fordetails).
The electric G Valve system is simple to install with standard four core cable, and provides more accurate measurement and control than typical pneumaticallyoperatedsystems.
Temperature Probe8060
System Types
Electric G Valve
3-Way Temperature Control Valves - Model G
page5 DS_AM_G_0910
Electro-Pneumatic System The electro-pneumatic valve system combines both electric and pneumatic technology, consisting of a pneumatically actuated three-way control valve with an electro-pneumatic converter,type8064A.Seepage18formoredetails.
The probe sends a resistance signal to the electroniccontroller,whichinturnsendsa4to20mAsignaltoanI/Pconverterthatconvertsthistoapneumaticsignal.
The electro-pneumatic system combines the features and functionality of the AMOT electronic controlsystemwiththefail-safeactionbenefitsofapneumaticallyactuatedvalve.
G ValveElectro-Pneumatic Converter 8064A
Temperature Controller 8071D
Temperature Probe 8060
Pneumatic Valve The pneumatic valve uses a spring return pneumatic actuator and positioner to control the rotation of the valve in response to an input signal from a pneumatic or electro-pneumatic controlsystem.Thepneumaticcontrolsystemsends a pneumatic signal ranging from 3 to 15psitotheactuatortocorrectlypositionthevalveatthedesiredtemperaturesetting.Thepneumatic control system usually consists of a P+I pneumatic controller, sensor and the necessary air supply conditioning equipment (regulators,filtersandwatertraps).
Pneumatic System The pneumatic valve system incorporates a pneumatically actuated three-way control valve with controller and integral temperature sensor, theSG80,whichcanbepanelorwallmounted.FormoreinformationontheSG80,seepage19.ThepneumaticGvalvesystemisidealwhenthere is a lack of electricity or when a fail-safe systemisneeded.
The pneumatic actuator is a rugged, quarter turn, double piston actuator operating on a scotchyokeprinciple.
Theactuatorisfittedwithspringreturnasstandardallowingfail-safeconfigurationifnecessary.Itisalsofittedwithavalvepositionerenablingaccurateandrepeatablemovement.See page 12 for more information on the pneumaticactuator.
SG80TemperatureController and Sensor
System Types continued
Pneumatic G Valve
G Valve
3-Way Temperature Control Valves - Model G
page6 DS_AM_G_0910
SpecificationFlow to: 3000m3/hr 13,200USgpm
Sizes: Standard flow High flow
80mm-450mm3”-18” 50mm-400mm2”to16”
Body/rotor materials: Bronze For seawater, shock resistance, or magnetic permeability
Ductile iron High performance iron, for fresh water, lubricating oils
Steel For high strength and high pressure ratings
Stainless steel Corrosive and special applications
l Low pressure drop - enables savings on either valve or pump size
l High accuracy providing better temperature control
Valve Body
3-Way Temperature Control Valves - Model G
page7 DS_AM_G_0910
The unique construction of the AMOT G valve providestotalflexibilitybyallowingyoutoselectthe valve port positions most ideally suited to meetyourapplicationrequirements.Therearetwomaintypesofmodeofoperation:90°rotorthat allows either ports 1 or 3 to be selected as thecommonport;and180°rotorthatrequiresport2tobethecommonport.Arrowindicatesvalve movement with increasing temperature or mA,asviewedfromabove(seediagram).
Electric actuator (basic actuator codes A & B)
Pneumatic actuator direct acting Pneumatic actuator reverse acting
Cold position Hot position 3 PSI (cold) 15 PSI (hot) No signal 15 PSI (cold) 3 PSI (hot) No signal
Valve selection curves for valves with 90orotor.Forvalveswith180o rotor multiply pressure drops by2.
AMOT type G valves are designed to produce minimal pressuredrop.Thenormalrecommendationinsizingthevalvesistoselectapressuredropbetween0.01to0.3bar(1.5and4.5PSI).
To use the graph it is advised to use the following method: 1.Startwithapressuredropof0.05baron theverticalaxis,readacrosstothecurve. 2.Followthislinedowntotheflowratesbelow untilyoufindthevalueclosesttoyourflowrate. 3.Followthelineacrosstothelefttodetermine suitablevalvesize. For stable control the valve should be selected so as to provideapressuredropwithfullflowofbetween0.01and0.3bar(1.5and4.5psi).
Viscosity:Findtheviscosityofthefluidinwhichthevalveistooperate.TheviscosityisnormallyexpressedinCentistrokes.WhereISOoilisused,the grade number is also the viscosity eg ISO VG46is46centistrokesat40°C(104°F).
Viscositycorrection:Byusingthecorrectiongraphbelow,theflowcoefficientcorrectionfactorcanbeestablished.Thecorrectionfigureobtainedfromthegraphshouldthenbemultipliedbytheoriginalflowcoefficientwhichcan then be used in the standard valve sizing formulae.
Engine oils
Oil CST
SAE5W 6.8
SAE 10W 32
SAE 20 46
SAE 20W 68
SAE 30 100
SAE40 150
SAE50 220
Gear oils
Oil CST
SAE75W 22
SAE80W 46
SAE85W 100
SAE 90 150
SAE140 460
SAE Oil Viscosities
Some approximate viscosities (CST) of SAE oils at40°C(104°F)areshownbelow,basedonleadingoilmanufacturers’publisheddata.
Some approximate viscosities (CST) ofSAEoilsat40°C(110°F)areshownbelow, based on leading oil manufacturers publisheddata.
Viscosity Correction
Co
rrect
ion
Fact
or
3-Way Temperature Control Valves - Model G
page 10 DS_AM_G_0910
The G valve is designed to produce minimal pressuredrop.Thenormalrecommendationwhen determining the size of an AMOT G valveisapressuredropbetween0.01and0.3bar(1.5and4.5psi).Note: Kv and Cv values are applicable to 90° rotor versions only.For180°versionsdividetheKvvalueby2.
Valve Flowrate
Size DN
Standard flow
80 100 150 200 250 300 350 400 450
High flow 50 80 100 150 200 250 300 350 400
Kv 82 207 323 729 1296 2025 2918 3972 5187
Cv 96 242 378 851 1513 2364 3405 4635 6053
ThebasicformulatodeterminetheKvofavalveis:
DpSGKv = Q
Q = Flow (m3/h)
Dp = Pressure drop (bar)
SG=Specificgravityoffluid
Kv=Valveflowcoefficient
ThebasicformulatodeterminetheCvofavalveis:
Dp
SGCv = QQ=Flow(USgallons/min)
Dp = Pressure drop (psi)
SG=Specificgravityoffluid
Cv=Valveflowcoefficient
There are two other ways that this formula can be used to
findtheflowinm3/horpressuredropofavalveinbar:
DpSGQ = Kv
KvQ
Dp = SG DpSGQ = Cv
CvQ
Dp = SG 2
2
SeethetablebelowforexamplesofKvandCv:
Valve SizingValve Sizing Calculations
Pressure Drop
There are two other ways that this formula can be used to
TheAMOTGValveisnotatightshutoffvalve.When used in a reasonably balanced pressure system there will be some small amounts of leakagebetweenports.Theactualamountofleakage will vary with the pressure difference betweentheseports.ConsultAMOTforfurtherinformation if the application is sensitive to leakage rates or if high pressure differences are likelytooccur.
Performance Size (DN) Duty cycle 20°C Stroke time (secs) Max currrent (A)
Standard High flow 50 Hz 60 Hz 220V 110V
80-300 50-250 65% 25 21 0.88 1.7
350&400 300&350 100% 31 26 0.92 1.9
450 400 100% 31 26 1.62 3.62
Electric Actuator
3-Way Temperature Control Valves - Model G
page 12 DS_AM_G_0910
TheAMOTactuator/valvepositionerisconfiguredtoacceptanindustrystandard4-20mApositiondemand input signal, and uses this to operate internalsolidstateswitchingtodrivethemotor. The microprocessor based unit uses the signal from the contactless position sensor to accurately position the actuator, taking into account motor responsetimeandactuatorovershoot. The positioner is split into two parts, housed in the terminalbox.Thereisapowermodule,inwhichall high voltage circuits are fully encapsulated to withstandhighvibration,andacontrolboard.Thisdesignallowsforeasymaintenance.
Userconfigurationallows:
lTheinputcanbeselectedfrom4-20mA, 0-20mA,0-5V,0-10Vand2-10Vbyswitches. l 4-20mAoutput,whichshowsactualvalve position,canbeconfiguredtoretransmitthe demandinputsignal.
lAswitchallowsforeasyconfigurationof which end of stroke corresponds with a 4mAdemand.
lThe action on sensor fail can be selected frommovingtoeitherthe4mAorthe20mA positions,butisfactorysettonotmoving.
lThe deadband can be increased to aid performancewithnoisyinputsignals.
lWhen necessary, such as after maintenance, the actuator can be recalibrated at the touch ofabutton.
Electronic Positioner
Overview of Pneumatic ActuationKey features and benefits
lA rugged quarter turn, double piston, rack and pinion pneumatic actuator with spring returnandvalvepositionerasstandard.
There are three LEDs on the terminal box on the side of the actuator, providing clear visual indicationofactuatorstatus.Twoalarmoutputsallowforremotefaultmonitoring.
Electronic Positioner
3-Way Temperature Control Valves - Model G
page 13 DS_AM_G_0910
Example Code 06 GG S D B S 32 E B D B BA -AA Code Description
Valv
e B
od
y S
ele
ctio
n
ValveSize
Nominal Bore Size Comments02 2 Inch (DN50) High Flow only03 3 Inch (DN80)04 4 Inch (DN100)06 6 Inch (DN150)08 8 Inch (DN200)10 10 Inch (DN250)12 12 Inch (DN300)14 14 Inch (DN350)16 16 Inch (DN400)18 18 Inch (DN450) Standard Flow only
Valve Model Model TypeGG Model G Valve
Valve Flow TypeValve Flow Type (Refer to flow coefficient table for Cv/Kv data)
S Standard Flow ValveH High Flow Valve
Valve Body and Rotor Material
Body and Rotor MaterialB BronzeD Ductile IronR Stainless SteelS Carbon Steel
Valve Flange Connection Standard and Class
Flange Class Flange Standard CommentsA PN6 EN 1092B PN10 EN 1092C PN16 EN 1092J 150 ASMEL 10K JISM 5K JISN 150 MIL-PRF-20042E Bronze Valves only
Rotor Type Rotor TypeS Standard Rotor
Valve Mode of Operation
Rotor PositionCold Process
Rotor PositionHot Process
Rotation Starting From Cold Position
12 Port 1 Port 2Clockwise23 Port 2 Port 3
31 Port 3 Port 121 Port 2 Port 1
Anticlockwise32 Port 3 Port 213 Port 1 Port 3
Valv
e A
ctu
ato
r S
ele
ctio
n
Valve Actuation TypeActuator Type
E ElectricP Pneumatic
Actuator Supply Power or Air Connections
Power Supply or Air Connection
Ele
c A 100 -120 Vac 50/60HzB 200 - 240 Vac 50/60Hz
Pne 1 G1/4 (1/4" BSPP)
2 1/4" NPT
Actuator Hardware Options
Hardware OptionsHardware Options
Ele
ctric A Standard - No Additional Hardware
B PositionerC 1KΩ PotentiometerD Positioner + 1KΩ Potentiometer
Pne 0 Standard - No Additional Hardware
1 Manual Override
Actuator Control Input Signal
Start of Stroke at Cold Rotor Position
Finish of Stroke at Hot Rotor Position
Comments
Ele
c A Relay Switched Line Power Positioner OptionalB 4mA 20mA Positioner Hardware
Options B or D OnlyC 20mA 4mA
Pne 1 3psi 15psi
2 15psi 3psi
Actuator Feedback Signal
Feedback Signal Comments
Ele
ctric
AA None
BA Position Retransmit Requires Positioner: Hardware Options B or D AND Input Signal Options B or C
CAPosition Retransmit 4-20mA (Start/Finish)
Requires Positioner: Hardware Options B or D AND Input Signal Options A
DAPosition Retransmit 20-4mA (Start/Finish)
Requires Positioner: Hardware Options B or D AND Input Signal Options A
Pne 00 None
Customer Special Options -AA Standard Product -*** Customer Special Code Assigned
How to OrderUsethetablebelowtoselecttheuniquespecificationofyourGvalve.
3-Way Temperature Control Valves - Model G
page14 DS_AM_G_0910
PID Valve Controllers 8071/8072D and Solid State Relays 47581L001
Key features and benefits
lFully programmable PID-based control -allowseasysystemconfiguration