Tapping Armature Valve Seal Covering for Stiffness and Chemical Resistance
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Solution Overview
Problem
Existing tapping armatures face challenges in achieving reliable sealing and mechanical stiffness while maintaining chemical resistance, limiting the choice of materials for the valve body.
Innovation Solution
The valve body is designed such that the inner side facing the liquid is covered by the valve seal, preventing direct liquid contact and allowing the valve body to be optimized for mechanical properties without specific chemical resistance requirements, using materials like polypropylene for the seal and body, which can be produced in a single injection moulding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the valve body is made from a material with high stiffness for reliable torque transmission, then the mechanical strength is improved, but the chemical resistance deteriorates when the material is exposed to liquid
Solution Approach 1:
The valve body is segmented into two distinct material zones: the outer shell is made from a stiff material (e.g., fibre-reinforced plastic) for mechanical strength, while the inner side that contacts liquid is made from a chemically resistant material (e.g., polypropylene) for chemical resistance. This segmentation allows each zone to be optimized for its specific function without compromise.
Solution Approach 2:
Different regions of the valve body have different material properties: the outer region requires high stiffness for torque transmission, while the inner region requires chemical resistance for liquid contact. The invention applies local quality by making the inner side of the valve body from a chemically resistant material while the outer shell maintains structural stiffness.
2Object-affected harmful factors
If the valve body is made from a material with high chemical resistance, then the chemical resistance is improved, but the mechanical stiffness deteriorates
Solution Approach 1:
The valve body is segmented into two distinct material zones: the outer shell is made from a stiff material (e.g., fibre-reinforced plastic) for mechanical strength, while the inner side that contacts liquid is made from a chemically resistant material (e.g., polypropylene) for chemical resistance. This segmentation allows each zone to be optimized for its specific function without compromise.
3Reliability
If the valve seal is made flexible for snug fitting to the outlet tube, then the sealing capability is improved, but the structural stability deteriorates
Solution Approach 1:
The valve body incorporates a localized flexible element (the valve seal) at the specific location where sealing is needed, while the rest of the valve body maintains its structural stiffness. The inner side of the valve body is made from a chemically resistant material that provides both structural stability and the necessary flexibility for the valve seal to conform to the outlet tube surface.
Data Source
AI summary
A tapping armature for liquid containers, in particular for being connected to the outlet neck or outlet opening of a transport and storage container, having an armature housing in which a valve body for opening and closing a flow cross-section of an outlet tube is pivotable with the help of a valve shaft, the valve body including a valve seal arranged, at least partially, at a peripheral edge of the valve body, such that, in a shut-off position of the valve body, a valve gap formed between the valve body and an internal wall of the outlet tube is sealed in a radial sealing plane by the valve seal, wherein at least one inner side of the valve body that faces a liquid volume for shut-off is covered by the valve seal such that a liquid contact face arranged on the inner side is realised by the valve seal.