QT-250 Quarter-Turn Marine Electric Valve Actuator

Featured Specifications

  • Preceise quarter-turn control
  • 250 Nm max torque
  • Designed for butterfly and ball valves
  • IP68 aluminum housing (stainless steel available)
  • Easy installation/retrofit
  • User-configurable torque, closing time
  • Permanently lubricated
  • Low power consumption
  • Manual emergency override
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QT_250_Multiturn_Actuator

Description

QT250 is suitable for a wide range of small to medium sized butterfly- and ball valves with an operating torque of 50-250 Nm, The quarter turn series offers a high level of precision on the control of valves.

NAG 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.

Technical Specifications

Technical Data 
Torque* 36-185ft/lbs (250 Nm max)
Valve Stem Connector** Valve Spindle Adaptor. SQ17, 38mm depth.
Valve Applications Butterfly and Ball Valves with partial turn operation
Valve Flange F04, F05, F07. According to ISO5211.
Min-Max Closing Time 0-100% / 0-90° 13-60 sec
*Configurable using Eltorque Manager - download free at: www.eltorque.no/downloads
Mechanical
Dimensions (H, W, D) 9.01, 6.14, 8.22 in (229, 156, 209 mm)
Weight 26.5 lbs (12 kg)
Housing IP68 (continuous submersion, 32ft/10m - 72hr)
Corrosion resistant aluminum housing
Operating Temperature -13° to 131°F (-25° to 55°C)
Over Temp. Protection Current controlled
Under Temp. Protection Stator coils used as heating element
Finish Black
Electrical
Supply Voltage 110-240 V AC/DC (50/60 Hz)
Power Consumption Max: 240 VA
Cables & Cable Glands 
  • 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 installation manual for specific requirements)
  • Circular MIL connectors for power/control/configuration
​Control 
Interface Options

Digital: 2x digital input (Open & Close)
3x digital output (Open, Closed & Alarm)

Analog: analog input (set position) analog output (feedback position) digital output (open, closed & alarm)
Modbus Fieldbus: Max 31 nodes per/network
CANopen Fieldbus: Max. 127 nodes/network, allows positioning and other extended controls.
Network 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
  • 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
Apprx. Number of Turns
Closed - Open
21: 0-100% / 0-90°
Certifications 
  • CE-Marked
  • Type approved by DNV, GL, CCS, ABS, (Product Design Assessment - PDA), BV, & LR

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