Overmolded Liquid Container Valve With Semi-Helical Leak Closure
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Solution Overview
Problem
Existing liquid container valves fail to prevent leakage during transport and storage while being cost-effective and easy to manufacture, and they often require complex mechanisms to allow gravity-driven flow when inverted.
Innovation Solution
A normally closed overmolded valve made entirely of recyclable plastic, featuring semi-helical plastic springs that maintain the valve in a closed position during upright storage and open with an upward force when the container is inverted, allowing gravity-driven flow through a cylindrical substrate with radially spaced vent openings and snap-fitted components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex valve mechanism is used to prevent leakage during transport, then leakage prevention is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The valve is segmented into distinct functional components: a valve body with vent openings, a movable valve member, and semi-helical springs. This segmentation allows each component to perform its specific function efficiently while simplifying the overall design and manufacturing process compared to integrated complex mechanisms.
Solution Approach 2:
The valve member is inverted relative to conventional designs, with the stem extending downward instead of upward. This inversion, combined with the semi-helical spring configuration, creates a simpler mechanism that reliably prevents leakage during transport while easily allowing flow when inverted for use.
2Reliability
If a complex valve mechanism is used to prevent leakage during transport, then leakage prevention is improved, but manufacturing cost increases
Solution Approach 1:
The valve is segmented into distinct functional components: a valve body with vent openings, a movable valve member, and semi-helical springs. This segmentation allows each component to be manufactured separately using standard plastic molding processes, reducing overall manufacturing cost while maintaining reliable leakage prevention.
Solution Approach 2:
The valve is designed as a disposable component made entirely of recyclable plastic, eliminating the need for expensive materials or complex assembly processes. The simple molded construction makes it cost-effective to manufacture and replace.
3Ease of operation
If traditional valve designs are used, then valve function is achieved, but ease of assembly is reduced and manufacturing complexity increases
Solution Approach 1:
Multiple functional features are merged into single components: the valve body integrates vent openings, sealing surfaces, and spring mounting features. The valve member combines the closure element, stem, and spring attachment in one molded piece, dramatically simplifying assembly.
Solution Approach 2:
The semi-helical springs are designed to automatically engage with the valve member and valve body during insertion, eliminating the need for separate spring installation steps. The valve assembly is designed to self-align and self-assemble, making it trivial to install.
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 effectively prevents leakage during transport and storage, is cost-effective, easy to assemble, and ensures sustainable operation by utilizing fewer components and recyclable materials, while allowing efficient gravity-driven flow when needed.
Implementation Method 1
a pair of semi-helical plastic springs which yieldably urge the valve to its closed position
Implementation Method 2
opens to permit liquid to flow, by gravity, downwardly therethrough
Data Source
AI summary
An overmolded valve is provided for use in a container having a throat. The valve is inserted into the throat of the container and prevents liquid from flowing from the container during shipment or storage. When the container is inverted for use with a dosing and/or dispensing apparatus, the valve remains closed until it is opened by an upward force to permit liquid to flow from the container, by gravity, to the dosing and/or dispensing apparatus. The valve closes when the upward force is removed. A pair of plastic semi-helical springs urge the valve to the closed position.