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QT-800 Electric Valve Actuator

from Eltorque

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Quarter-turn Electric Valve Actuator

NAG Marine QT Series electric valve actuators offer a high level of precision valve control. They are an ideal solution for small to medium sized butterfly and ball valve control requirements with an operating torque range of 184-590 foot-pounds.


NAG Marine MT Series electric valve actuators are designed to be maintenance free, and feature completely enclosed, permanently lubricated transmissions to ensure extended reliable service in the harshest operating conditions.


About QT-800



  • 800 Nm max torque
  • Designed for butterfly and ball valves
  • IP68 aluminum housing
  • Easy installation/retrofit
  • User-configurable torque, closing time, & position
  • Permanently lubricated
  • Low power consumption
  • Manual emergency override


  • + Technical Specifications

    Torque * 185-500ft/lbs (250-800 Nm max.)
    Valve Stem Connector ** See notes
    Valve Applications ** Butterfly & ball valves with partial turn operation (typical)
    Valve Flange ** See notes
    Dimensions (H,W,D) 12.9, 7.5, 9.45 in (330, 190, 240 mm)
    Weight 46 lbs (21 kg)
    Housing IP68 (continuous submersion, 32 ft / 10 m - 72 hrs)
    corrosion resistant aluminum housing
    Operating Temp -13° to 131°F (-25° to 55°C)
    Over Temp Protection Current controlled
    Under Temp Protection Stator coils used as heating element
    Finish Black, silver
    Supply Voltage 110-240V AC/DC (50/60 Hz)
    440V AC (60Hz)
    Power Consumption Max: 200 VA
    Cables & Cable Glands
    Power Up to five (5) M20 cable glands allow for serial connection of power supply and fieldbus wiring
    Actuator housing includes threaded mounting holes
    Use IP68 glands for all wires to maintain IP rating
    Optimized for fieldbus installation (refer to intstallation manual for specific requirements)
    Interface Options Digital:
    2x digital input (open & close)
    3x digital output (open, closed & alarm)
    CANopen Fieldbus: Max. 127 nodes/network - allows positioning & extended control
    Valve Position Sensor Absolute position sensor, provides correct feedback even after power failure
    Resolution 0.39% / 0.35° & 360° range
    Configuration & Set-Up USB connection to PC with Eltorque Manager v.3
    Configurable Parameters Valve type
    Open & Closed positions
    Speed, torque, valve position, valve seat region position
    Inverted I/O or fieldbus parameters depending on control interface
    Emergency & Safety
    Manual Operation Standard fixed hand wheel, mechanical valve-position indicator
    Appx. Turns
    21 - 0-100% / 0-90°
    Markings CE marked
    Approvals Type approved by DNV, GL, CCS, ABS (Product Design Assessment - PDA), BV and LR
    Electromagnetic Interference (EMI) Built to meet or exceed MIL-STD-461E
    Type Approvals DNV, GL, CCS, ABS, (Product Design Assesment-PDA), BV & LR
    Markings CE marked
    * Configurable using Eltorque Manager v.3 - download free at:
    ** Adapted flange bracket and stem connection is required and must be ordered with the actuator
    Customer must provide a valve/manifold drawing to ensure proper mechanical interfacing.



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