Diaphragm Valve End-Stop Calibration Using Actuating Current
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Solution Overview
Problem
Diaphragm valves with positioning actuators face issues due to varying production tolerances and mechanical end-stop alignments, leading to increased stress and wear on the diaphragm, as well as the need for expensive pressure-responsive diaphragms and additional sensors.
Innovation Solution
A method for determining the end-of-travel positions of a diaphragm valve using a positioning actuator, where the diaphragm is moved to predefined positions by monitoring actuating current values, allowing for tolerance correction and irregularity detection, and enabling autonomous adjustment and verification of positions during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical end stops are used to define diaphragm travel positions, then the valve structure is simple and robust, but production tolerances and assembly variations cause misalignment between diaphragm end positions and mechanical end stops, increasing stress and wear on the diaphragm
Solution Approach 1:
The system performs preliminary measurement of the actual diaphragm travel positions during commissioning by monitoring actuating current values. The controller saves these measured positions as reference values before normal operation begins, allowing the system to compensate for manufacturing tolerances and assembly variations in advance.
Solution Approach 2:
The system continuously monitors the actuating current value during diaphragm movement and compares it against saved reference values. When the current value indicates that a diaphragm end position has been reached, the controller receives feedback and autonomously adjusts the positioning actuator to correct any misalignment, ensuring optimal diaphragm positioning throughout operation.
2Adaptability or versatility
If pressure-responsive diaphragms are used to compensate for position variations, then the diaphragm can adapt to position changes, but the production cost increases significantly
Solution Approach 1:
The system uses the existing positioning actuator and control electronics to automatically measure, detect, and correct diaphragm positions without requiring additional specialized components. The controller autonomously performs all position compensation functions using standard electrical components already present in the valve system.
Solution Approach 2:
The patent replaces the mechanical pressure-responsive diaphragm solution with an electrical/electronic system that uses actuating current monitoring and automated control to achieve position adaptation. This substitution eliminates the need for expensive pressure-responsive materials while providing equivalent or superior adaptability.
3Measurement precision
If additional sensors are installed to detect diaphragm positions accurately, then position measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The actuating current value serves as an intermediary parameter that indirectly indicates diaphragm position. Instead of directly measuring position with sensors, the system uses the electrical current required to move the positioning actuator as a proxy measurement, which correlates with diaphragm position throughout the travel range.
Solution Approach 2:
The existing positioning actuator and control electronics perform multiple functions: they both drive the diaphragm movement and simultaneously provide position measurement capability through current monitoring. This eliminates the need for separate dedicated position sensors and reduces overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method extends the lifespan of diaphragm valves, reduces wear, and allows for autonomous correction of operational irregularities, enhancing the valve's performance and reliability without the need for additional sensors or expensive pressure-responsive components.
Implementation Method 1
initiating displacement of the diaphragm, wherein the diaphragm is moved preferably by means of an actuator, more preferably by means of a positioning actuator
Implementation Method 2
ascertaining the first end-of-travel position of the diaphragm, wherein said first end-of-travel position is ascertained by monitoring an actuating current value
Data Source
AI summary
A method for determining the end-of-travel positions of a diaphragm in a diaphragm valve having an actuator:initiating displacement of the diaphragm into a first end-of-travel position;ascertaining the first end-of-travel position of the diaphragm, wherein said first end-of-travel position is ascertained by monitoring an actuating current value, wherein the first end-of-travel position is reached when a predefined current value is reached;saving the first end-of-travel position;moving autonomously, preferably in the opposite direction, towards a second end-of-travel position of the diaphragm;ascertaining the second end-of-travel position of the diaphragm, wherein said second end-of-travel position is ascertained by means of a predefined travel length (a) of the diaphragm from the first end-of-travel position;saving the second end-of-travel position.