Pinch Valve Sealing Geometry for Low-Force Leak Prevention
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Solution Overview
Problem
Pinch valves often require high actuation forces to achieve a tight seal and can be cumbersome to operate, with potential leaks occurring at moderate force levels, making them difficult to control and reopen.
Innovation Solution
The pinch valve arrangement incorporates an engagement protrusion and a non-circular cross section in the valve portion, allowing for reduced actuation forces and increased reliability, with the engagement protrusion providing a high contact force in the engaged state and the non-circular cross section enabling sealing with minimal movement, along with a self-opening feature due to hydrostatic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high actuation force is applied to achieve a tight seal, then sealing reliability is improved, but the valve becomes difficult to operate and requires excessive force
Solution Approach 1:
The valve body is divided into multiple sealing zones with different geometries (first sealing zone with larger diameter, second sealing zone with smaller diameter). Each zone contributes to the overall sealing function, distributing the sealing effort and reducing the actuation force required for any single zone to achieve a tight seal.
Solution Approach 2:
Different regions of the valve have different geometric properties - the first sealing zone has a larger diameter and the second sealing zone has a smaller diameter. This local variation in geometry allows each zone to optimize its sealing contribution, with the larger zone providing initial sealing and the smaller zone providing enhanced sealing, thereby improving overall reliability without requiring excessive actuation force.
2Ease of operation
If moderate actuation force is applied, then ease of operation is improved, but leaks occur at the seal interface
Solution Approach 1:
The sealing function is segmented into two distinct zones. The first sealing zone with larger diameter provides initial sealing at moderate forces, while the second sealing zone with smaller diameter provides additional sealing assurance. This segmentation ensures that leaks are prevented even when only moderate actuation force is applied.
Solution Approach 2:
The first sealing zone with larger diameter acts as a preliminary sealing mechanism that engages first during valve actuation. This preliminary sealing action occurs at lower forces, preventing leaks before the second sealing zone is fully engaged, thereby ensuring sealing reliability at moderate actuation levels.
3Ease of manufacture
If the valve structure is simplified, then ease of manufacture is improved, but the ability to provide tight sealing is reduced
Solution Approach 1:
The valve incorporates localized geometric variations (different diameters in different sealing zones) within an otherwise simple overall structure. These local quality modifications provide enhanced sealing capability without requiring complex additional components or structures, maintaining ease of manufacture while improving sealing reliability.
Solution Approach 2:
Two sealing zones are merged into a single integrated valve body structure. The first and second sealing zones work together as a unified sealing system, combining their sealing contributions to achieve reliable sealing. This merging approach provides tight sealing without requiring separate complex sealing mechanisms or multiple valve components.
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 design reduces the actuation force required for sealing, enhances reliability, and provides a self-opening mechanism to prevent overpressure damage, improving the overall performance and efficiency of the pinch valve.
Implementation Method 1
the engagement protrusion is arranged to provide a high contact force in the engaged state
Implementation Method 2
a self-opening feature due to hydrostatic pressure
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present disclosure relates to a pinch valve arrangement (60) arranged to be used in a hydraulic circuit (30), the pinch valve arrangement (60) comprising an at least sectionally deformable fluid line (98), a pinching unit (64) comprising an engagement element (90) that is arranged to engage a defined valve portion (102) of the fluid line (98) for controlling a fluid flow through the fluid line (98), and an engagement protrusion (92) at the engagement element (90), wherein the engagement protrusion (92) occupies a subsection of a longitudinal extension of the engagement element (90), and wherein a main extension direction of the engagement protrusion (92) is perpendicular to the longitudinal dimension. The present disclosure further relates to a foodstuff dispensing apparatus (10) comprising a hydraulic circuit (30) incorporating at least one pinch valve arrangement (60), and to a use of a pinch valve arrangement (60).