A spring actuated valve uses a spring to control its position when no external force is applied.
When powered, the actuator valve moves in one direction, overcoming the spring force. When power is cut, the spring pushes the valve back to its original position.
This fail-safe design ensures automation valves return to a default state when pressure or electricity is lost.
Components of a Spring Actuated Valve
A spring actuated valve has a few key components that power its movement.
Each part has a specific role, working together to control flow and ensure a fail-safe operation.
Here’s a table highlighting the main ones along with the function they serve:
| Component | What It Does |
| Actuator Body | Holds everything together and provides support. |
| Spring | Pushes the valve back to its default position when the signal stops. |
| Piston/Diaphragm | Moves when pressure is applied, shifting the valve open or closed. |
| Valve Stem | Connects to the actuator and controls fluid flow. |
| Control Signal | Sends the command to activate the actuator and move the valve. |
Working Mechanism of a Spring Actuated Valve
A spring actuated valve moves using external pressure or force and returns to its original position when power is cut.
The process follows a simple sequence:
Power Applied (The Valve Moves)
When air, electricity, or hydraulic pressure is supplied, the force pushes the valve open or closed.
Spring Compression (Holding the Position)
The applied pressure compresses the internal spring, keeping the actuator valve in position as long as power is maintained.
Power Loss (The Spring Takes Over)
When the control signal stops, the pressure releases, and the spring expands, forcing the valve back to its starting position.
This automatic return function makes spring return electric actuators a fail-safe choice for automation valves in safety-critical applications.
How a Spring Return Electric Actuator Works
A spring return electric actuator uses an electric signal to move the valve while the spring handles the return motion.
When powered, the actuator moves the valve into place.
As soon as the power cuts off, the spring forces the valve back to its default state.
This guarantees that the valve returns to a safe position without manual intervention.
Spring Return vs. Double-Acting Actuators
A spring actuated valve works differently from a double-acting actuator.
One relies on a spring for movement when power is lost, while the other uses pressure on both sides.
Here’s a quick comparison:
| Feature | Spring Return Actuator | Double-Acting Actuator |
| Power Source | Air, electricity, or hydraulic pressure on one side | Air or hydraulic pressure on both sides |
| Spring Mechanism | Uses a spring to return to the default position | No spring; pressure controls both movements |
| Fail-Safe Function | Returns to default if power is lost | Stays in place until pressure changes |
| Common Use Cases | Safety-critical automation valves | Continuous process control |
Spring return electric actuators are preferred when fail-safe operation is required, while double-acting actuators work best for precise, bidirectional control.
Applications of Spring Actuated Valves
Industries use spring actuated valves to ensure systems shut down safely when power or pressure is lost.
- Oil & gas – Shuts off pipelines automatically when pressure drops.
- Water treatment – Regulates water flow in filtration and distribution.
- Chemical processing – Seals off pipelines to prevent leaks.
- HVAC systems – Controls airflow in heating and cooling units.
- Manufacturing – Keeps automated production lines running smoothly.
These automation valves keep operations safe and reliable, no matter the industry.
Conclusion
That’s everything you need to know about spring actuated valves and how they work.
The key takeaway is that these valves use a spring return to bring them back to a default position when power or pressure is lost. That’s why they’re widely used in automation valves where fail-safe operation is critical.If you need a spring return electric actuator built for reliability, we’ve some options designed to fit different system requirements. Contact us to learn more.
