Fluid Backflow Prevention System with Diaphragm-Check Valve
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Solution Overview
Problem
Conventional backflow prevention mechanisms for plumbing fixtures, such as check valves and air-gap devices, have limitations in effectively preventing cross-contamination of backflow fluid with clean incoming fluid, especially in complex plumbing setups.
Innovation Solution
A fluid backflow prevention system comprising a housing with a diaphragm and a check valve, where the diaphragm is configured to engage and disengage the check valve to block or allow fluid flow through a backflow path, preventing backflow into the incoming fluid portion and ensuring clean fluid remains separate from contaminated fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve with spring and ball element is used to prevent backflow, then backflow prevention is achieved, but the device complexity increases and mechanical parts are required
Solution Approach 1:
The patent removes the spring and ball element components from the check valve mechanism, extracting only the essential flow-blocking function. This simplification eliminates complex mechanical parts while maintaining backflow prevention capability through a more straightforward valve design.
Solution Approach 2:
The simplified check valve is designed to operate autonomously using the fluid's own pressure differential to open and close the valve. The valve automatically responds to flow conditions without requiring external control mechanisms, springs, or moving parts, achieving self-regulating backflow prevention.
2Device complexity
If an air-gap device is used to prevent backflow, then backflow prevention is achieved using simple physics principles, but the device cannot actively respond to pressure changes
Solution Approach 1:
The check valve incorporates dynamic elements that automatically adjust the valve position in response to changing pressure differentials. The valve transitions between open and closed states based on real-time flow conditions, providing active adaptability while maintaining a simple overall device structure.
Solution Approach 2:
The valve utilizes pneumatic and hydraulic principles by relying on the fluid's own pressure differential to control valve operation. The pressure-driven mechanism eliminates the need for external power sources or complex control systems, achieving adaptability through fundamental fluid mechanics.
3Reliability
If multiple waterways are enclosed within a housing to separate clean and wastewater, then cross-contamination is prevented, but the housing complexity and manufacturing difficulty increase
Solution Approach 1:
The housing is divided into distinct segments or sections, each enclosing specific waterways for clean water and wastewater. This segmentation allows for modular manufacturing and assembly, reducing overall housing complexity while ensuring effective separation of fluid paths to prevent cross-contamination.
Solution Approach 2:
The patent employs a nested structure where components are arranged concentrically or in overlapping configurations within the housing. This nesting approach maximizes space utilization, simplifies the housing geometry, and maintains clear separation between waterways while reducing manufacturing steps.
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 system effectively prevents fluid backflow into the incoming fluid portion, thereby eliminating cross-contamination and ensuring the integrity of clean water supplies in plumbing fixtures.
Implementation Method 1
The diaphragm is configured to deflect upward (i.e., engage) with the check valve to block the flow of fluid through a backflow path
Implementation Method 2
The diaphragm further configured to deflect downward (i.e., disengage) with the check valve to unblock the flow of fluid through the backflow path
Data Source
AI summary
A fluid backflow prevention system may comprise a housing having a first segment enclosing an incoming fluid portion, a backflow shell, and a cap, the housing having a second segment enclosing a clip coupled to an outgoing fluid portion, the first and second segments being coupled together via a waterway extending from the first segment to the second segment. The housing further encloses a backflow shell having a diaphragm and a check valve, the diaphragm configured to deflect upward with the check valve to block the flow of fluid through a backflow path defined within the backflow shell which enables fluid flow through a plurality of waterways defined within the housing, the diaphragm further configured to deflect downward with the check valve to unblock the flow of fluid through the backflow path thereby permitting fluid to flow out of the system rather than back through the incoming fluid portion.