Chromatography Valve System for Rapid CO2 Depressurization
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Solution Overview
Problem
Conventional chromatography systems face challenges in controlling pressurization and depressurization, particularly during column switching, which can lead to backflow and reduce column life, and pose safety risks due to the time required for depressurization in CO2-based systems.
Innovation Solution
A flow system with a pressurized reservoir, pump, shut-off valve, and vent valve configured to actuate in a coordinated manner for complete control of pressurization and depressurization, ensuring safe and efficient operation by venting every time flow is stopped and maintaining the system in a depressurized state before column switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chromatography systems use CO2-based mobile phase with traditional valve control, then the system can achieve chromatographic separation, but the depressurization time is excessive and safety risks increase
Solution Approach 1:
The patent divides the single valve control function into three separate valves: a first valve controlling the mobile phase supply line, a second valve controlling the column outlet, and a third valve providing a vent path. This segmentation allows independent control of pressurization and depressurization pathways, enabling rapid system depressurization by opening the vent valve while closing the supply and outlet valves, thus resolving the contradiction between safety and depressurization time.
Solution Approach 2:
The patent introduces a vent line with a third valve as an intermediary pathway between the column outlet and the atmosphere. This mediator provides a dedicated depressurization route that bypasses the normal flow path, allowing rapid pressure release without affecting the chromatographic separation integrity, thereby reducing depressurization time while maintaining safety.
2Productivity
If column switching is performed without complete depressurization, then operational efficiency improves, but backflow occurs and column life is reduced
Solution Approach 1:
The patent implements preliminary depressurization by automatically closing the first and second valves and opening the third vent valve before column switching operations. This preliminary action ensures the system is fully depressurized before any column manipulation occurs, preventing backflow and protecting column integrity, thus extending column life while maintaining operational efficiency through automated control.
Solution Approach 2:
The patent employs a controller that monitors system pressure and automatically actuates the three valves in the appropriate sequence based on operational signals. The feedback mechanism ensures that depressurization is completed before column switching begins, providing intelligent control that protects columns from backflow damage while optimizing operational efficiency through automated timing and coordination of valve operations.
3Reliability
If traditional single valve control is used for pressurization, then device complexity is low, but complete control of pressurization and depressurization cannot be achieved
Solution Approach 1:
The patent segments the pressurization and depressurization control functions into three dedicated valves positioned at critical points in the system: the first valve on the mobile phase supply line, the second valve at the column outlet, and the third valve on the vent line. This segmentation provides complete and independent control over pressure management, allowing any combination of pressurization and depressurization states, thus achieving reliable pressurization control despite increased device complexity.
Solution Approach 2:
The three-valve system provides multi-functional capability, enabling the system to perform pressurization, depressurization, flow control, and column isolation functions simultaneously or independently. This universal control system can adapt to various operational modes including normal chromatographic operation, rapid depressurization, column switching, and emergency venting, achieving complete pressurization control while the integrated design minimizes unnecessary complexity.
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
This solution enhances safety by ensuring the system is depressurized quickly, reducing the risk of backflow and extending column life by preventing pressure buildup, thus improving operational efficiency and accuracy.
Implementation Method 1
a vent valve disposed between the at least one pump and the outlet port... configured to actuate in a coordinated manner with the shut-off valve and the pump control valve to control a pressurization of the flow system
Implementation Method 2
at least one pump including a pump control valve... configured to actuate in a coordinated manner with the shut-off valve and the vent valve to control a pressurization of the flow system
Data Source
AI summary
Exemplary embodiments are directed to devices, methods and systems capable of pressurization, generally involving a flow system that includes a pressurized reservoir, at least one pump including a pump control valve, an outlet port, a shut-off valve and a vent valve. The flow system is configured to be pressurized. The shut-off valve is disposed between the pressurized reservoir and the at least one pump. The vent valve is disposed between the at least one pump and the outlet port. The shut-off valve, the vent valve and the pump control valve of the at least one pump are configured to actuate in a coordinated manner to control a pressurization of the flow system. Exemplary embodiments are further directed to devices, methods and systems for column switching, generally including at least a first column, a second column and a column switching valve.