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Spring Return Electric Actuator Lomas

The ETM series spring return electric actuators are designed for fail-safe valve operation in case of power failure. They are ideal for 90° rotation of butterfly valves, ball valves, and plug valves in applications requiring an emergency fail position.

Key features include:

• Compact design for minimal space requirements
• Built-in spring module stores energy during normal operation
• Spring automatically returns valve to safe position on power loss
• Controlled return speed prevents damage to valves and piping
• High efficiency spring drive with up to 20,000 cycle life
• Simple and reliable limit switch setting
• 3D position indicator visible from multiple angles
• Meets SIL 2/3 safety standards
• Adjustable fail-safe position (open or closed)
• Modular ISO 5211 mounting flanges for installation flexibility
• Weatherproof IP67 enclosure, optional IP68 and explosion-proof models

In normal powered operation, an electric motor drives the actuator while the spring is compressed to store energy. If power is lost, the spring releases and returns the actuator to its fail-safe position in a controlled manner, either fully open or fully closed. Manual override allows operation without power.

Specifications:

• Torque range: 50 to 600 N•m
• Voltage: 110/220 VAC (models for 230/240 VAC)
• Power: 30 to 120 W
• Motor run time: 51 to 59 sec
• Spring return time: ≤30 sec
• Duty cycle: S2-15min
• Output flange: ISO 5211 F07 to F14
• Ambient temp: -25 to 65°C
• Humidity: 95% at 25°C
• Ingress: IP67 standard, IP68 and explosion-proof Exdâ…¡ optional
• Cable entry: 2 x 3/4″ NPT
• Weight: 35 to 80 kg
• Fail direction: CW standard, CCW optional
• Built-in limit switches: 2 open, 2 closed
• Control: On-off or modulating, 2-wire or 3-wire

Four models are available covering a torque range from 50 to 600 N•m. Refer to the specification table and dimension drawings for details. Use the ordering code to specify fail position, voltage, control type, manual override, color and flange.

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