QT-250 Quarter-Turn Marine Electric Valve Actuator

Product Overview

Easy-Install, User-Configurable Electric Quarter-Turn Valve Actuator for Butterfly & Ball Valves

The QT-250 is part of NAG Marine's Quarter-Turn Series of electric valve actuators, engineered for reliable operation of butterfly and ball valves in demanding marine and industrial environments. Designed for medium to high-torque flow control applications, the QT-250 delivers dependable performance, intelligent operation, and long-term reliability for automated valve systems operating in harsh conditions. Its rugged IP68-rated construction and maritime approvals ensure durability in corrosive and high-efficient monitoring and system integration.

NAG Marine Electric Valve Actuators are designed to be maintenance-free and feature fully enclosed, permanently lubricated transmissions to provide extended reliable service in harsh maritime and industrial environments.

Request Quote

Features Technical Specs View Datasheet Get Support

Features

Medium-to-High Torque Quarter-Turn Operation
Compact, space-Efficient Design
Low Power Consumption
Flexible Communication Protocol Support
IP68-Rated Rugged Construction
Maintenance-Free Operation
Real-Time Valve Status & Feedback
Maritime Type Approved
Intelligent Position & Control Monitoring

Technical Specs

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

View Datasheet

Get Support

QT-250 Quarter-Turn Marine Electric Valve Actuator

Product Overview

Easy-Install, User-Configurable Electric Quarter-Turn Valve Actuator for Butterfly & Ball Valves

QT-250 Electric Quarter-Turn Valve Actuator Datasheet

Contact Support