Multi-Part Valve Diaphragm With Plastic End Stop for Re-Tensioning
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Solution Overview
Problem
Tension relaxation in diaphragm valves due to factors like temperature, material selection, and applied tensioning force leads to unpredictable clamping forces, resulting in potential leaks and reduced service life.
Innovation Solution
A diaphragm with a clamping region featuring recesses for tensioning means made of plastics material, providing a defined end stop during assembly and re-tensioning, ensuring consistent clamping force through parallel aging of the diaphragm and tensioning means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tensioning force is applied to the diaphragm during assembly, then the diaphragm achieves proper sealing function, but tension relaxation occurs over time due to temperature and material aging, leading to reduced clamping force and potential leaks
Solution Approach 1:
The patent introduces a tensioning element made of plastics material that is pre-installed in the diaphragm's clamping region. This tensioning element undergoes parallel aging with the diaphragm material, experiencing the same temperature and stress conditions. The preliminary action of installing the tensioning element ensures that both the diaphragm and tensioning element age together, maintaining consistent tension characteristics throughout the service life and preventing tension relaxation that would lead to leaks.
Solution Approach 2:
The patent changes the material parameter of the tensioning element from traditional metal to plastics material. This parameter change allows the tensioning element to have similar thermal expansion and aging characteristics as the diaphragm material. The plastics material's coefficient of thermal expansion and aging behavior are matched to the diaphragm, ensuring that temperature changes and aging processes affect both components equally, thereby maintaining stable clamping force over time.
2Reliability
If the diaphragm is re-tensioned to compensate for tension relaxation, then sealing performance is restored, but excessive or insufficient clamping may occur due to unpredictable tension loss, requiring trial and error adjustment
Solution Approach 1:
The patent incorporates a feedback mechanism through the plastics tensioning element that provides direct tactile feedback to the assembler during assembly and re-tensioning. The tensioning element is designed to offer a distinct mechanical stop or resistance when the optimal clamping force is achieved. This feedback allows the assembler to immediately sense when the correct tension is applied, eliminating the need for trial and error adjustments and ensuring consistent sealing performance.
Solution Approach 2:
The patent replaces the traditional mechanical adjustment system with a plastics-based tensioning element that provides inherent mechanical feedback. Instead of relying on complex adjustment mechanisms or subjective assessment of clamping force, the plastics tensioning element itself provides a built-in mechanical indicator through its deformation characteristics and resistance properties, simplifying the re-tensioning operation and improving ease of operation.
3Force
If traditional metal tensioning means are used, then initial clamping force is sufficient, but the tensioning means does not age parallel with the diaphragm material, leading to differential aging and unpredictable tension loss
Solution Approach 1:
The patent applies the principle of homogeneity by making the tensioning element from plastics material that is compositionally similar to the diaphragm material. Both components now share the same material family, thermal properties, and aging characteristics. This material homogeneity ensures that both the diaphragm and tensioning element respond identically to temperature changes and aging processes, eliminating differential aging and ensuring stable, predictable clamping force throughout the service life.
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
Ensures precise re-tensioning and reproducible sealing, preventing leaks and extending the service life of the diaphragm while reducing maintenance costs.
Implementation Method 1
Since the tensioning means is exposed to the same temperatures and clamping forces as the diaphragm in its clamping region, the tensioning means ages together with the rest of the diaphragm
Implementation Method 2
Clamping portions belonging to the diaphragm valve compress the clamping region of the diaphragm during assembly until they butt up against the resistance of the tensioning means
Implementation Method 3
The aged tensioning means is then available, at a reduced height, to provide a deformation resistance upon re-tightening
Data Source
AI summary
The invention relates to a diaphragm for a diaphragm valve having a functional region and a clamping region surrounding the functional region, at least one main body of the diaphragm freeing at least one opening in the clamping region, in which at least one gripping aid comprising a plastics material is provided.