Single Selector Valve Assembly for Dual Eductor Carry-Over Reduction
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Solution Overview
Problem
Current selector valve systems for eductors suffer from residual carry-over when switching between chemical concentrates, are costly due to dual eductor setups, and prone to user error from complexity and labeling requirements.
Innovation Solution
A single selector valve assembly with a rotatable member and indexing system that minimizes carry-over by using a seamless flow path and color indicators, integrated with two eductors, reducing the need for separate valves and labels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate eductors and two separate selector valves are used to provide high and low flow rates, then flow rate control is achieved, but system cost and complexity increase
Solution Approach 1:
The patent combines two separate eductors and two separate selector valves into a single integrated eductor assembly with a single selector valve that has multiple positions. This merging reduces system complexity and cost while maintaining the ability to provide different flow rates through the integrated design of the eductor body and valve mechanism.
Solution Approach 2:
The single selector valve is designed with multiple positions (first position, second position, and intermediate position) that can selectively connect different passages to accommodate both high flow rate and low flow rate requirements. This multi-functional valve replaces the need for separate valves for different flow rate modes.
2Adaptability or versatility
If two separate eductors and selector valves are used, then flow rate options are provided, but user error and mishandling increase
Solution Approach 1:
By merging the selection controls into a single selector valve with clearly defined positions, the system eliminates the confusion that arises from having two separate valves. The user can only select from the available positions on the single valve, preventing the error of mismatching selector valve positions with incorrect eductor connections.
Solution Approach 2:
The patent introduces an intermediate position in the selector valve that serves as a neutral or default state between the high flow rate position and the low flow rate position. This intermediate position acts as a mediator that guides users through a safe transition state, reducing the likelihood of accidental improper connections.
3Adaptability or versatility
If channeled disks are used in selector valves, then four different chemical concentrates can be controlled, but residual carry-over occurs when switching between concentrates
Solution Approach 1:
The patent extracts or eliminates the channeled disk component from the selector valve design. By removing this component, the source of residual carry-over is eliminated, while the alternative passage configuration maintains the ability to selectively control multiple chemical concentrates without the contamination issue.
Solution Approach 2:
Instead of using channeled disks that create dead zones and carry-over, the patent inverts the approach by using a design with multiple passages that are selectively opened or closed. This reverse design approach ensures complete flow path clearance when switching between concentrates, preventing residual carry-over while maintaining multi-concentrate selection capability.
Data Source
AI summary
A selector valve assembly for use in conjunction with an eductor dispensing system which reduces the incidence of product carry-over when the valve is moved from one position to another. The selector valve assembly also reduces the incidence of improper dispensing. In a preferred manner, the selector valve assembly has a single valve member and accommodates four product inlet lines for selectively passing chemical concentrate to two eductors. The selector valve assembly is composed of a minimum of ports, thereby reducing maintenance and cost.