Design Features QT series electric actua tors are
designed & eng ineered for robust, reliable and for
high performance d uty onto quarter turn valves. Th e unique
reliable motor m odule, adjustable cam plate lim i t s witch,
self locking mechanism, precision g earing system and
ball bearings, the auto declutching m echanism, light force
lo ad on the hand-wheel, the adapt or drive bushing and bo t tom
ISO 5211 mounting dimensi on, are advantages aga instothers in the
field of va lve automation. CE appr ovedSELF LOCKING
MECHANISMBecause of the worm gear design system, all the electric
actuators are self locking.HEATERFor prevention of condensation due
to weather & temperature changes, and also keeps internal
components clean & dry, a 20 watt space heater is provided inside
all the electricactuators. ENCLOSUREStandard enclosure
to water jet pr oof & water tight proof IP 67 and EXCT4(on
request) HANDWHEELCorrect size of hand-wheel on the
electricactuator ensure adequate strength for safe and efficient
emergency operation. MOTORSquirrel cage motor
is of encapsulated type, on high stall torque and low
inherent force for seating &unseating of valves. All motors are
integrated with build-in thermal protection. MANUAL
OVER-RIDEEngage by pulling the lever & turning the hand- wheel.
Lever is auto declutch vvhen power supply is switched on, and
hand-wheel does not turn as extra safety feature.
TERMINAL CONNECTION & WIRINGTerminal connections are
of "WAGO" push on type, making wiring connection very easy &
without fuss. Elect rical wiring circuit isstandardized for single
& three phasevoltage. Addition termination is available on
request. INTERNAL COMPONENTS ARRANGEMENTInternal mechanical
and electrical components are designed in modular mounting
arrangement, and can be easily removed for maintenance purposes.
Additionoptional accessories are also possible. LIMIT
SWITCHESA pair of limit switches are activated by means of simple,
reliable & adjustable cam plates, mounteddirectly onto, and driven
by center column. The unique cam plate design does not allow over
travel of limitswitches. (Only on basic type) TORQUE
SVVITCHESELectric actuators on 100 Nm and above areinstalled with
torque switches for over-load protection (only basic
type) Electronic Remote ControlsInternal drive to reverse the
actuator rotation direction via remote control signals with
internal 24 V DC or external 24 V DC/AC up to 120 V DC/AC power
supply. As default, remote controls are configured as "3-wires" (1
signal to open and 1 signal to close); remote controls can be
configured as "2-wires" (signal present to open, signal absent to
close). VISIUAL POSITION INDICATORThe visual position
indicator is directly mounted onto the center drive column
to provide the visual position of the valve.
POTENTIOMETER - optionalIs available on request, is to provide &
transmit remote indication of valve position. MOUNTING &
ADAPTATIONBottom flange mounting dimension conform to ISO 5211. A
adaptor drive bushing is provided for every electric actuator, is
removable and formachining to suite valve stem size.
General ApplicationsThe QT model is available in five sizes
and is designed for on/off or modulating control of butterfly,
ball, rotary plug valves or dampers in a wide range of heavy
industrial, chemical and petrochemical plants on and
offshore. Technical DataFeaturesLow or high voltage single
phase DC or AC power supply with 3-phase optionMultiple adjustable
stroking times to suit specific applicationsInterchangeable base
plate and range of shaft inserts enable simple connection to any
valve typeIntelligent control unit prevents overheatingEpicyclical
gearing ensures reliable and smooth operationTop-mounted position
indicator Power supply:Voltage fluctuations: Frequency:Torque
output:Single phase from 24 to 48 V DC or AC at 50/60 Hz Single
phase from 100 to240 V DC or AC at 50/60 Hz3-phase from 208 - 240 V
AC, 380 - 480 V AC and500 - 575 V AC+/-10%+/- 5%From 60 Nm to 2500
Nm Constantly-engaged, hand wheel-operated manual override in
case of power failureNon-intrusive configuration, operation and
diagno stics (only on intellgence model)Local control panel for
manual valve operation with additionalLCD sreen indicators (Not
available on basic model)Simple upgrade options for modulating
control and network Ambient temperature
Standard range:Low temp range: Conduit entry:-25 °C to +70 °C /-13
°F to 158 °F-40 °C to +70 °C /-40 °F to 158 °F NPT 3/4 x 2
ApprovalsWaterproof:Explosionproof:IP 67EX DII CT4 (EX
model)Optional Modules and PerformanceOptional modules
Starter Module (Code: E)Available for the pulse passive dry contact
point for on / off from DCSAnalog position OUTPUT 4-20 mA or 0-10 V
DC 4 additional SPST output contactsAdditional LCD screen and two
magnetic knobs for on/off and locol/stop/remote switch as locol
interfaceElectronic limit swtich and torque switchModalating Module
(Code: EZ)Analog position I
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