Fail Safe Actuators

Fail Safe Actuators are designed for applications where safety, reliability, and controlled shutdown are critical. In the event of power loss or system failure, these actuators automatically move to a predetermined safe position—typically fully open or fully closed—ensuring that flow, airflow, or isolation is maintained in a way that protects people, equipment, and infrastructure.
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Electric Fail Safe Actuators

Spring Return Electric Actuators
Battery Backup Electric Actuators

Spring Return Pneumatic Actuators

Spring return pneumatic actuators are designed for applications where safety and reliability are critical. Unlike double-acting actuators, these units use an internal spring pack to automatically drive the actuator to a predefined safe position if the air supply is lost. This ensures that valves or dampers move to either fully open or fully closed during a fault, power outage, or emergency condition.
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Belimo Fail-Safe Actuators

Belimo’s range of fail-safe actuators spans multiple series, including TF, LF, NF, SF, EF, and GK, with operating voltages from 24V through to 230V. Designed for dependable emergency operation, these actuators move to their safe position in under 35 seconds, with controlled motor run times of up to 150 seconds.

Covering damper sizes from approximately 0.5m² to 8m² and delivering nominal torque ratings from 2.5Nm to 40Nm, the range supports a wide variety of HVAC and building control applications. This breadth ensures the correct actuator can be specified for everything from compact air-handling units to large-scale ventilation systems where fail-safe performance is essential.

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Industries

Valpes Battery Backup Electric Actuators

Valpes battery backup electric actuators deliver torque outputs from 10 to 2400 Nm and are designed to automatically return to their original position in the event of power loss. They are compatible with the ER PLUS, VR/VS, VRX/VSX (ATEX), DV/DVX (DNV-GL and ATEX), VT PLUS, and MT ranges, providing broad application flexibility across industrial and hazardous environments.

GS6 models are equipped with AXMART® Bluetooth® technology, enabling wireless monitoring, configuration, and diagnostics. With an S4 50% duty rating, multivoltage capability, IP66 to IP68 protection, and an integrated failure feedback relay, these actuators ensure dependable on-off control in demanding conditions. Features such as fast battery replacement and configurable “fail to close” or “fail to open” behaviour via AXMART v3 deliver a practical, high-performance fail-safe solution.

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J&J Battery Backup Electric Actuators

The J&J J4CS electric valve actuator features true multi-voltage plug-and-play capability, allowing seamless operation across 24–240V AC or DC using its built-in auto-conversion sensor system. This simplifies site standardisation and removes the need for different actuator variants when voltages change.

With a 75% duty rating, it offers a cost-effective alternative to pneumatic systems while reducing ongoing maintenance requirements. An integrated fail-safe battery backup ensures the valve automatically returns to a predefined open or closed position during power loss, making it ideal for critical applications where reliability is essential.

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Frequently Asked Questions

A fail safe actuator is designed to move a valve or damper to a predefined safe position when power or control is lost. This ensures systems respond predictably during faults, outages, or emergencies.

They typically use spring return or battery backup technology. Spring return models store mechanical energy, while battery-backed units use internal power to complete a final movement when supply power is lost.

They protect people, equipment, and processes by ensuring valves and dampers do not remain in an unsafe position during failures. This is critical in cooling, fire safety, gas, and pressure systems.

They are widely used in data centres, HVAC systems, fire and smoke control, power generation, oil and gas, water treatment, and industrial process plants.

Spring return actuators move instantly using stored mechanical energy. Battery backup actuators complete a controlled movement using internal power, even during extended outages.

Yes. Most models can be configured to move either fully open or fully closed depending on the safety requirement of the application.

Spring return types require power to hold the non-safe position. Battery-backed units can hold position and then move when power is lost.

Response times vary by model, but many are designed to reach the safe position in seconds, ensuring rapid protection during emergencies.

Yes. They are engineered for high cycle life and continuous duty in demanding environments such as HVAC plants and industrial systems.

Modern fail safe actuators are designed to integrate directly with BMS and control platforms, providing status feedback, alarms, and remote control.

They require minimal maintenance, typically involving periodic functional checks, inspection of mechanical components, and battery replacement where applicable.

Selection depends on torque requirements, voltage, environmental conditions, response time, and whether spring return or battery backup is preferred for the application.

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Fail Safe Actuators