Dispensing Assembly Valve Actuation and Backflow Prevention
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Solution Overview
Problem
Conventional fluid dispensing systems face issues with backflow prevention, fluid wastage, and complexity, particularly when not in use, and often require complex designs to manage pressure effectively.
Innovation Solution
A dispensing assembly with a valve system that responds to fluid pressure changes, using a flow sensing valve and check valves to control fluid flow, preventing backflow and optimizing fluid delivery by switching between open and closed positions based on pressure variations, and incorporating a venturi chamber for mixing fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional fluid dispensing systems use signal hoses or connections between valve and dispensing head, then fluid flow control is achieved, but system complexity and cost increase
Solution Approach 1:
The patent removes the complex signal hose connection system between the valve and dispensing head. Instead, it uses a simple trigger mechanism on the dispensing head that directly actuates the valve through a mechanical linkage, eliminating unnecessary intermediate components and simplifying the overall system architecture.
Solution Approach 2:
The trigger mechanism serves multiple functions: it actuates the valve to control fluid flow, provides user feedback through mechanical resistance, and integrates the control function directly into the dispensing head. This multi-functionality reduces the need for separate control systems and signal transmission components.
2Adaptability or versatility
If conventional fluid dispensing systems maintain connection with water supply when not in use, then system readiness is maintained, but fluid wastage occurs
Solution Approach 1:
The valve is designed to automatically close and seal when the trigger is released, preemptively preventing fluid wastage before it can occur. The mechanical linkage ensures the valve is in the closed position by default, and only opens when actively triggered, eliminating continuous fluid flow during non-use periods.
Solution Approach 2:
The system automatically manages its own fluid flow control through the mechanical trigger-valve linkage. When the trigger is released, the valve self-closes without requiring additional control signals or manual intervention, preventing fluid wastage autonomously and maintaining system readiness for immediate use.
3Ease of operation
If conventional fluid dispensing systems use complex valve control mechanisms, then fluid flow control precision is improved, but system cost and complexity increase
Solution Approach 1:
The patent replaces complex electro-hydraulic or electronically-controlled valve mechanisms with a simple mechanical trigger linkage system. The trigger directly mechanically actuates the valve through a connecting rod or spring-loaded mechanism, achieving precise fluid flow control through pure mechanical means, thereby reducing system complexity and cost.
Solution Approach 2:
The valve design incorporates a spring-loaded mechanism that changes the mechanical parameters of the valve actuation. The spring provides progressive resistance and ensures positive sealing, allowing precise control of fluid flow through mechanical parameter optimization rather than complex control systems.
4Loss of energy
If pressure washer shuts off motor when fluid not supplied, then energy saving is achieved, but pressure relief becomes problematic
Solution Approach 1:
The patent introduces a bypass valve or pressure relief port as an intermediary mechanism that allows excess pressure to be safely discharged when the motor is shut off. This intermediary component mediates between the pressure buildup from motor shutdown and the system integrity, preventing damage while enabling energy-saving shutdown operation.
Solution Approach 2:
The system employs periodic cycling of the motor and valve operation. When fluid flow stops, the motor shuts off periodically, and the bypass valve periodically releases pressure. This periodic action pattern allows energy saving through motor shutdown while managing pressure through rhythmic pressure relief cycles.
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 ensures controlled and efficient fluid dispensing, preventing backflow and wastage, while maintaining operational stability across varying pressure ranges, ensuring reliable performance even when not plumbed or in use.
Implementation Method 1
the valve movable from the opened position to the closed position responsive to a change in fluid pressure within the second chamber, and movable from the closed position to the opened position responsive to an opposite change in fluid pressure within the second chamber
Implementation Method 2
incorporating a venturi chamber for mixing fluids
Data Source
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AI summary
A dispensing assembly for dispensing a mixture of fluids is provided. In some embodiments, the dispensing assembly includes a first valve for selectively permitting fluid flow to a mixing chamber in which a second fluid is introduced, wherein the valve is actuated between open and closed positions responsive to fluid pressure downstream of the mixing chamber. In such embodiments, the fluid pressure downstream of the mixing chamber can change based upon whether fluid is dispensed from a spray gun, wand, nozzle, or other dispensing head of the dispensing assembly.