Extraction Fitting Valve Body Segmentation for Sealing
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Solution Overview
Problem
Existing removal fittings for liquid containers face challenges in achieving secure sealing and chemical resistance, limiting the material selection for the valve body, which compromises mechanical properties and increases the number of individual parts required for manufacturing.
Innovation Solution
The valve body is designed such that only the inside surface facing the liquid volume is covered by the valve seal, allowing for optimization of mechanical properties without considering chemical resistance, and the valve seal is cohesively connected to the valve body, enabling production through injection molding and reducing the number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the valve body is made of material optimized for mechanical properties (e.g., fiber-reinforced plastic), then the rigidity and structural strength are improved, but the chemical resistance to liquid contact deteriorates
Solution Approach 1:
The valve body is divided into two functional zones: the outer surface (facing outlet) is made of fiber-reinforced plastic for mechanical strength, while the inner surface (contacting liquid) is covered with a valve seal made of chemically resistant material. This segmentation allows each zone to have optimized material properties for its specific function.
Solution Approach 2:
Different material properties are applied to different locations of the valve body. The inner surface requires chemical resistance and is covered by the valve seal, while the outer surface requires mechanical strength and is made of fiber-reinforced plastic. This local differentiation resolves the contradiction between mechanical properties and chemical resistance.
2Object-affected harmful factors
If the valve seal covers the entire surface of the valve body, then chemical resistance is improved, but the mechanical rigidity of the valve body deteriorates due to material constraints
Solution Approach 1:
The valve seal coverage is segmented to only cover the inner surface that contacts the liquid, while leaving the outer surface exposed. This selective coverage provides chemical resistance where needed without compromising the overall mechanical rigidity of the valve body.
Solution Approach 2:
Instead of covering the entire valve body surface with the valve seal, only the necessary inner surface is covered. This partial action provides sufficient chemical resistance for the liquid contact area while minimizing the impact on mechanical properties.
3Ease of manufacture
If the valve body and valve seal are manufactured as separate parts, then ease of manufacture is improved, but the number of individual parts increases
Solution Approach 1:
The valve body and valve seal are merged into a single integrated component manufactured in one injection molding process. The valve seal is formed as an integral part of the valve body, eliminating the need for separate manufacturing and assembly steps while reducing the total number of parts.
Solution Approach 2:
The single injection molding process serves multiple functions: it manufactures both the valve body structure and the valve seal coating in one operation. This multi-functionality resolves the contradiction between manufacturing ease and part complexity.
Data Source
Figure 1
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AI summary
The invention relates to an extraction fitting (10) for liquid containers (15), particularly for connecting to the throat (14) or the outlet of a transport and storage container for liquids, comprising a fitting housing (11) in which a valve body that can be pivoted with a valve shaft and is used to open and close a flow cross-section of an outflow pipe is arranged, the valve body comprising a valve seal which is at least partially arranged on a peripheral edge of the valve body in such a way that, in a shut-off position of the valve body, a valve gap formed between the valve body and an inner wall of the outflow pipe is sealed by the valve seal in a radial seal plane, and at least one inner side (20) of the valve body, facing a liquid volume, for shut-off, is covered by the valve seal such that a liquid contact surface arranged on the inner side (20) is embodied by the valve seal.