Elastomeric Valve Assembly for Reverse Flow Prevention
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Solution Overview
Problem
Existing valve assemblies for pressure-responsive fluid flow control often fail to effectively minimize reverse fluid flow, which is crucial in various applications such as dispensing beverages and industrial processes.
Innovation Solution
A valve assembly featuring a resiliently deformable elastomeric valve member with a compound sealing surface and retention projections, which cooperates with a valve seat to allow pressure-responsive fluid flow while preventing reverse flow by using a frusto-conical sealing surface and stop members to limit deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple elastomeric valve member is used for pressure-responsive flow control, then the device complexity is reduced and manufacturing cost is lowered, but the ability to minimize reverse fluid flow deteriorates
Solution Approach 1:
The valve member is segmented into distinct functional zones: a frusto-conical valve head for sealing, an intermediate portion for deflection, and a peripheral attachment portion for mounting. This segmentation allows each zone to perform its specific function optimally while maintaining overall simplicity.
Solution Approach 2:
The valve head is formed with a frusto-conical (curved) sealing surface that cooperates with a complementary curved valve seat. This curved geometry provides superior sealing engagement compared to flat surfaces, effectively minimizing reverse fluid flow while maintaining a simple single-piece elastomeric construction.
2Ease of operation
If the valve member is made highly resilient for pressure-responsive actuation, then the responsiveness to pressure differential is improved, but the control over reverse flow increases due to excessive deflection
Solution Approach 1:
Different portions of the valve member have different structural properties: the valve head is thick and rigid for stable sealing, the intermediate portion is thin and flexible for pressure-responsive deflection, and the peripheral attachment portion is reinforced for secure mounting. This local differentiation allows the valve to respond to pressure while maintaining control.
Solution Approach 2:
The valve member is pre-formed with a specific frusto-conical geometry and attached to the valve body in a predetermined orientation. This preliminary configuration ensures that when pressure differential occurs, the valve deflects in the correct direction and maintains proper sealing engagement without requiring additional control mechanisms.
3Reliability
If a frusto-conical sealing surface is used to enhance reverse flow prevention, then the sealing engagement is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The entire valve member including the frusto-conical sealing surface is formed from a single homogeneous elastomeric material in one molding operation. This eliminates the need for separate machining or assembly steps, reducing manufacturing precision requirements while maintaining superior sealing geometry.
Solution Approach 2:
The elastomeric valve member with its frusto-conical geometry is molded as a composite structure integrated with the rigid valve body. This combination of materials and geometries achieves reliable sealing while the molding process inherently provides the necessary dimensional accuracy without requiring post-manufacturing precision work.
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 controls fluid flow, allowing forward flow while significantly reducing reverse flow, enhancing sealing engagement and preventing backflow in applications like medical infusion systems and beverage dispensing.
Implementation Method 1
The valve member comprises resiliently deformable elastomeric material, with at least part of the valve head being outwardly deflectable to an open configuration when a sufficient pressure differential exists across the valve assembly
Data Source
AI summary
The present invention is directed to a pressure-responsive valve assembly which functions in the nature of a check valve to control fluid flow across the assembly. The assembly includes a valve body which defines first and second internal flow passages, and includes a valve seat through which at least one flow port extends for joining the first and second passages in fluid communication with each other. A flexible, resiliently deformable valve member is positioned in operative association with the valve seat, and can be deflected, in response to a sufficient pressure differential, to move out of sealing engagement with the valve seat, to thereby permit fluid flow through the valve assembly.