Filling Valve Control via Differential Pressure
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Solution Overview
Problem
Filling product filling systems face challenges in achieving precise and rapid control of filling valves due to inertia and time delays in existing control systems, which affect the accuracy and reliability of filling operations, especially when multiple filling valves are connected in parallel.
Innovation Solution
A method that involves determining differential pressure across control valves and regulating them based on this pressure to achieve quick and reliable control, decoupling from the properties of the filling product and reducing inertia, allowing for precise volume flow control through the use of parallel filling valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow meters and control loops are used to control filling valves, then volume flow can be specified and maintained, but inertia and time delay prevent immediate reaction to changes in initial conditions and supply
Solution Approach 1:
The patent replaces the mechanical flow measurement system (flow meters) with a differential pressure-based control system. By measuring the pressure difference across the filling valve and using this to calculate volume flow, the system eliminates the inertia and time delays inherent in mechanical flow meters and control loops, enabling immediate reaction to changes in initial conditions and supply.
Solution Approach 2:
The patent introduces differential pressure measurement as an intermediary parameter to control volume flow. Instead of directly measuring and controlling flow (which causes time delays), the system measures pressure difference across the valve and uses this intermediate parameter to calculate and control the desired volume flow, achieving faster and more responsive control.
2Device complexity
If multiple filling valves are connected in parallel via a common supply line, then system complexity is reduced, but initial conditions for each valve are influenced by line properties affecting control precision
Solution Approach 1:
The patent uses differential pressure measurement across each filling valve as an intermediary parameter that is independent of the common supply line properties. By measuring the pressure difference specifically at each valve rather than relying on flow measurements from a common line, the system eliminates the influence of line properties on control precision while maintaining the simplified parallel connection structure.
Solution Approach 2:
The patent segments the control measurement for each filling valve by measuring differential pressure individually across each valve. This segmentation isolates the measurement for each valve from the common supply line, ensuring that control precision for each valve is not influenced by the properties or conditions of the shared supply line.
3Adaptability or versatility
If proportional valves are used to control volume flow, then filling behavior can be optimized, but dependence on filling product properties and control loop inertia reduce responsiveness
Solution Approach 1:
The patent replaces mechanical flow control and measurement systems (proportional valves with flow meters) with a differential pressure-based control system. This substitution eliminates the dependence on filling product properties that affects mechanical systems and removes the inertia inherent in control loops, enabling both optimized filling behavior and rapid responsiveness.
Solution Approach 2:
The patent changes the control parameter from volume flow (which depends on product properties and causes inertia) to differential pressure. By controlling and measuring pressure difference across the valve rather than direct flow, the system achieves adaptability in filling control while eliminating the productivity losses associated with mechanical system inertia and product property dependence.
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 approach enables improved control behavior, ensuring accurate and uniform filling results even with multiple filling valves connected in parallel, reducing the risk of incorrect fillings and improving the overall efficiency of the filling process.
Implementation Method 1
determining a differential pressure Δpv falling across the control valve pv
Data Source
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AI summary
The invention relates to a method for filling a container with a filling product in a filling-product filling system having a control valve (12, 180), comprising the steps: determining a dropping pressure difference Δρν across the control valve (12, 180); and closed-loop and/or open-loop control of the control valve (12, 180) in accordance with the determined pressure difference Δρν.