Valve Actuator Control for Position Drift and Accurate Seating
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Solution Overview
Problem
Conventional valve actuators face challenges in accurately controlling torque and maintaining the fully seated or closed position of valves due to variations in operating conditions, such as material buildup and wear, which can lead to incomplete valve closure and increased maintenance needs.
Innovation Solution
A control system for valve actuators that monitors characteristics during movement, detects position drift, and adjusts the valve element's position to ensure accurate seating by dynamically altering the approach speed and torque application, using sensors and adaptive algorithms to maintain optimal valve operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed torque threshold is set at startup, then the actuator can provide sufficient torque for initial operation, but the valve may not reach full seated position when operating conditions change over time
Solution Approach 1:
The torque threshold is changed from a fixed value to a dynamically adjustable parameter. The control system continuously monitors valve position and operating conditions, then automatically adjusts the torque threshold to match current requirements, enabling the actuator to adapt to wear, material buildup, and other changing conditions without manual intervention
Solution Approach 2:
The system implements feedback control by monitoring valve position through sensors and comparing it against the target seated position. Based on this feedback and detected position drift, the control system adjusts the torque threshold and repositions the valve to ensure complete seating, creating a closed-loop control system that maintains reliability despite changing conditions
2Reliability
If the actuator applies high torque to ensure valve closure, then the valve can overcome material buildup and wear, but the actuator may cease operation due to exceeding the fixed torque threshold
Solution Approach 1:
The torque threshold is dynamically adjusted based on detected position drift and current operating conditions. When the system detects that the valve has drifted from its seated position due to wear or material buildup, it increases the torque threshold to allow the actuator to apply higher torque without triggering the shutdown condition, ensuring continuous operation while maintaining valve closure
Solution Approach 2:
The system changes the torque parameter from a fixed threshold to a variable threshold that adapts to operating conditions. By monitoring position drift and calculating the additional torque required to reseat the valve, the system modifies the torque parameter in real-time, allowing the actuator to operate continuously even when higher torque is needed to overcome wear and material buildup
3Manufacturing precision
If the valve is configured for a fixed fully seated position, then the actuator can achieve precise initial positioning, but the position drifts over time due to wear and material buildup
Solution Approach 1:
The system continuously monitors valve position using sensors and compares it against the target seated position. When position drift is detected due to wear or material buildup, the feedback control system calculates the required adjustment and commands the actuator to reposition the valve, maintaining precise seating despite changing physical conditions
Solution Approach 2:
The system performs preliminary detection of position drift before it significantly impacts valve performance. By continuously monitoring position and detecting drift early, the control system can proactively adjust the valve position to compensate for wear and material buildup, preventing incomplete seating and maintaining precision over time
Data Source
AI summary
Valve systems and related methods include valve actuators and control systems configured to monitor at least one characteristic of the valve system during movement of a valve element to a position in the valve system and to determine a drift of the position based on the monitored at least one characteristic of the valve system.