Fluid Circuit Flow Switching with Isolation Valves
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Solution Overview
Problem
Existing fluid circuit systems with two parallel treatment elements face challenges in switching fluid flow between branches without pressure drops, leading to potential shutdowns due to the use of three-way valves, which can be delicate and prone to failure, and result in suboptimal operation or continuous flow disruptions.
Innovation Solution
A system utilizing two-way inlet and outlet isolation valves, equal pressure branches, and pressure detection means to switch fluid flow between treatment elements without pressure drops, ensuring continuous operation and maintenance without flow rate or pressure variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a three-way valve is used to switch fluid flow between parallel filtration branches, then the fluid can be directed to one branch while isolating the other, but a pressure drop occurs during switching and the valve operation becomes delicate and prone to failure
Solution Approach 1:
The patent divides the switching mechanism into multiple independent components: two separate two-way valves (one for each branch) instead of a single three-way valve. Each two-way valve independently controls one branch, eliminating the complex balancing act required by three-way valves and preventing pressure drops during switching.
Solution Approach 2:
The patent introduces isolation valves as intermediary components that completely isolate each filtration branch from the main circuit during switching. This intermediary mechanism ensures that when one branch is active, the other is hermetically sealed, preventing any pressure leakage or drop and enabling reliable switching without delicate valve balancing.
2Adaptability or versatility
If a three-way valve is used for flow switching, then flow direction can be changed, but the differential pressure switch misinterprets pressure drop as a fault causing installation shutdown
Solution Approach 1:
By segmenting the flow control into two independent two-way valves rather than one three-way valve, the system eliminates the pressure drop phenomenon that triggers false fault detection. Each valve independently manages its branch without affecting the other, maintaining stable differential pressure that prevents misinterpretation by the differential pressure switch.
Solution Approach 2:
The patent converts the potential harm of pressure drops (which cause false shutdowns) into a benefit by using complete isolation valves that maintain stable pressure differentials. The isolation mechanism, intended for maintenance purposes, also serves to prevent pressure fluctuations that would trigger false fault conditions, thereby ensuring continuous operation.
3Ease of repair
If a three-way valve is used to isolate a filtration branch, then the branch can be cleaned or replaced, but the valve may seize up or wear making operation impossible and requiring installation stoppage
Solution Approach 1:
The patent segments the isolation function into two separate two-way valves, each dedicated to one branch. This segmentation simplifies the mechanical design of each valve, reducing wear and seizure risks compared to a three-way valve. Each valve only needs to perform a single function (isolate its branch), making them more reliable and easier to operate over time.
Solution Approach 2:
The patent employs simple two-way isolation valves that are mechanically simpler and more robust than three-way valves. These simpler valves can be easily replaced if they do fail, and their straightforward design minimizes wear and seizure issues, ensuring long-term operational reliability for filter maintenance operations.
Data Source
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AI summary
The invention relates to a system for switching the flow of a fluid in a fluid circuit comprising two fluid treatment elements (F1, F2) mounted in parallel. The switching system serves to switch the flow to one or the other of the treatment elements (F1, F2). The system is characterized in that it comprises an isolation valve (VI1, VI3) mounted at the inlet of each treatment element (F1, F2), and two pressure equalization branches (BE1, BE2), each having a fluid outlet (S1, S2) downstream of a respective isolation valve (VI1, VI3) and in fluid communication with the inlet of a respective treatment element (F1, F2). The common fluid inlet of the pressure equalization branches (BE1, BE2) is located upstream of said isolation valves (VI1, VI3), and a pressure equalization valve (VE1, VE2) is mounted on each pressure equalization branch. (BE1, BE2).