What is the Difference Between "Air Source Overcomes Spring Output Torque" and "Spring Output Torque"?
Hearken Valve Automation
Manufactuer of pneumatic actuators,electric actuators,actuated valves,actuator accessories such as limit switchbox etc..
In pneumatic systems, understanding the difference between “air source overcomes spring output torque” and “spring output torque” is crucial for selecting the right actuator for your application.
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These two concepts relate to how actuators interact with air and spring forces to control valve positions.
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Air Source Overcomes Spring Output Torque:
When we refer to "air source overcomes spring output torque", it describes the situation in which the air pressure supplied to a single-acting actuator must overcome the torque produced by the internal spring before the actuator can output movement.
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In single-acting actuators, the air acts to overcome the resistance of the spring, allowing the actuator to move in one direction (typically to open or extend). Once the air pressure exceeds the spring's torque, the actuator moves freely to its desired position.
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This process is essential for ensuring that the actuator operates effectively during opening when the spring is in a compressed state.
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Spring Output Torque:
On the other hand, "spring output torque" refers to the torque generated by the internal spring when the actuator is closed, and no air is supplied.
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In this case, the spring itself is responsible for outputting torque to return the actuator to its resting position, typically when air is not ventilated or the actuator is in a fail-safe state.
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When the actuator is de-energized or loses air supply, the spring’s natural force takes over to close or retract the actuator to its default position.
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Conclusion
The former is the torque that needs to overcome the spring's own torque and then output when single-acting air is opened; the latter is the torque output by the spring when closed when air is not ventilated.