Valve Assembly Segmentation for Fluid Dispenser Leak Prevention
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Solution Overview
Problem
Existing valve assemblies for fluid dispensers face challenges in cost-effective manufacture due to stringent tolerance requirements and potential leaks from hydrostatic pressure, which limits their design flexibility and reliability.
Innovation Solution
A valve assembly design featuring two translational parts with resilient biasing and elastic elements, allowing wider tolerances and a reliable seal, with an operating element providing multiple positions to manage fluid flow effectively and reduce the risk of leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-piece valve members are used, then manufacturing precision must be very high to prevent leaks, but this increases manufacturing cost and complexity
Solution Approach 1:
The valve member is divided into two separate parts: a first valve part with a first closing surface for the inlet opening, and a second valve part with a second closing surface for the outlet opening. This segmentation allows each part to be manufactured independently with relaxed tolerance requirements, while still achieving reliable sealing at each interface.
Solution Approach 2:
An elastic element (spring) is introduced as an intermediary component between the two valve parts. This spring resiliently biases the valve parts apart, ensuring consistent contact pressure between the closing surfaces and their respective seats, thereby maintaining reliable seals even with wider manufacturing tolerances.
2Reliability
If tighter tolerances are imposed on valve components, then leak prevention improves, but manufacturing cost increases
Solution Approach 1:
By dividing the valve member into two separate valve parts, each with its own closing surface, the patent enables independent manufacturing of each component. This allows standard manufacturing tolerances to be used for each part, reducing overall manufacturing cost while maintaining effective leak prevention through the combined sealing action of both parts.
Solution Approach 2:
The patent changes the sealing mechanism from relying on precise dimensional parameters (tight tolerances) to relying on elastic deformation and resilient biasing. The elastic element compensates for dimensional variations in the valve parts and housing, maintaining reliable sealing without requiring tight manufacturing tolerances.
3Manufacturing precision
If resilient biasing is applied between valve parts, then tolerance compensation improves, but device complexity increases
Solution Approach 1:
A simple elastic element (spring) serves as the intermediary resilient biasing mechanism between the two valve parts. This single component effectively compensates for tolerances in the valve parts and housing by maintaining consistent contact pressure, without introducing complex adjustment mechanisms or additional moving parts.
Solution Approach 2:
The elastic element automatically compensates for tolerance variations and wear over time through its resilient properties. The spring continuously adjusts to maintain proper sealing pressure, providing self-regulating tolerance compensation without requiring external adjustment mechanisms or complex control systems.
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 enables cost-effective manufacturing with improved reliability and reduced risk of leaks, accommodating wider tolerances and ensuring efficient fluid dispensing across various fluid types, including liquids, pastes, and powders.
Implementation Method 1
The parts are resiliently biased apart and into closing abutment with the inlet and outlet openings, e.g. by means of an elastic element, such as a spring, positioned between the first and second parts of the valve member
Data Source
AI summary
A valve assembly for a dispenser for fluids including: a housing having at least an inlet opening and an outlet opening and a further opening connected or connectable to a fluid displacement mechanism, and a valve member including two parts translatably disposed within the housing, a first part for closing and opening the inlet and a second part for opening and closing the outlet.