Valve Disc Assembly Pressure Distribution
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Solution Overview
Problem
Existing valve technologies with ceramic discs face challenges in achieving fluid-tightness due to material compatibility issues and the need for precise surface planarity, which increases costs and mechanical strain, while also requiring stiff ceramic materials to manage thermal and pressure stresses.
Innovation Solution
A valve assembly with a pair of ceramic discs, where an inner ceramic disc is interposed between an outer ceramic disc and a partition plate, with a plunger that shifts the outer disc relative to the inner disc and partition plate, ensuring fluid-tightness by distributing pressure uniformly across a gasket and maintaining disc alignment through a trough-shaped interface, allowing for parallel movement that prevents fluid leakage regardless of flow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic discs are used as valve elements, then mechanical strength and dielectric strength are improved, but manufacturing precision requirements increase due to the need for planar surfaces
Solution Approach 1:
A plunger is introduced as an intermediary component between the actuating force and the ceramic disc. The plunger transfers the closing force to the disc while allowing for tolerance compensation, thereby reducing the manufacturing precision requirements for the ceramic disc surfaces while maintaining the strength benefits of ceramic material
Solution Approach 2:
The design changes the pressure distribution parameters by introducing a plunger that applies force at a specific point, creating a lever effect that amplifies the closing force on the ceramic disc. This parameter change allows for relaxed manufacturing tolerances while achieving the required sealing pressure
2Strength
If ceramic discs are used as valve elements, then mechanical strength is improved, but device complexity increases due to alignment requirements
Solution Approach 1:
The plunger serves as a mediator that simplifies the alignment requirements between the actuating mechanism and the ceramic disc. By introducing this intermediate component with appropriate tolerances, the overall device complexity is reduced while maintaining the mechanical strength benefits of ceramic material
Solution Approach 2:
The valve mechanism is segmented into distinct components (plunger, ceramic disc, housing) with independent tolerance zones. This segmentation allows each component to be manufactured and assembled with relaxed tolerances, reducing overall device complexity while maintaining performance
3Strength
If ceramic discs are used as valve elements, then dielectric strength is improved, but mechanical strain increases due to thermal and pressure stresses
Solution Approach 1:
The plunger acts as a stress-distributing intermediary between the actuating force and the ceramic disc. It distributes the mechanical strain over a larger area and provides a compliant interface that accommodates thermal expansion, thereby reducing peak stresses on the ceramic disc while maintaining dielectric strength
4Reliability
If planar surfaces are ground and polished on ceramic discs, then fluid-tightness is improved, but cost increases
Solution Approach 1:
The plunger is introduced as a mediator that compensates for surface irregularities through its own tolerance design and pressure distribution. This allows the ceramic disc surfaces to be manufactured with lower precision while still achieving fluid-tight sealing, thereby reducing manufacturing costs while maintaining reliability
5Stability of the object's composition
If stiff ceramic material is used, then strain reduction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The plunger serves as a tolerance-compensating intermediary that allows stiff ceramic material to be used for strain reduction while compensating for the resulting manufacturing precision difficulties. The plunger's design absorbs the dimensional variations, enabling the use of rigid ceramic material without requiring extremely precise surface planarity
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
The solution ensures fluid-tightness and reduces mechanical strain on ceramic discs, allowing for relaxed technical tolerances and cost-effective production by maintaining alignment and pressure distribution, thus enhancing the mechanical and dielectric strength of the valve assembly.
Implementation Method 1
The plunger does, however, allow (substantially) no displacement of the outer disc in a direction parallel to an envisaged direction of fluid flow
Implementation Method 2
As a fluid flows in the direction of the partition plate, a pressure is applied on an outer surface of the outer disc. That pressure exceeds the pressure inside the trough-shaped area. The outer ceramic disc is then pressed against the inner ceramic disc.
Data Source
Figure 1
Figure 2~3
AI summary
A disc assembly for a valve member, the disc assembly comprising: a plunger (2) and a movable disc (4) anchored to the plunger (2), a partition plate (9) and a fixed disc (5) interposed between the partition plate (9) and the movable disc (4), wherein the fixed disc (5) and the partition plate (9) each comprise a duct (6a, 6b), the ducts (6a, 6b) receiving the plunger (2), wherein a first pressure of a fluid applied to the movable disc (4) from inside a trough-shaped portion (8) and a second pressure of a fluid applied to the movable disc (4) from outside the trough-shaped portion (8), the second pressure exceeding the first pressure, are configured to apply a force to movable disc (4) that presses an abutting surface of movable disc (4) against an abutting surface of a protruding portion (7) of the fixed disc (5).