Selector Valve for Switching CO2 and Solvent in Chromatography
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Solution Overview
Problem
Liquid chromatography systems configured for CO2-based chromatography cannot easily switch to HPLC or UPLC without time-consuming and labor-intensive reconfiguration, limiting their versatility and safety.
Innovation Solution
A solvent delivery system with a manually or automatically controllable selector valve that allows switching between a source of pressurized fluid, such as CO2, and a solvent source at atmospheric pressure, enabling the system to operate as either HPLC or UPLC, and facilitating diagnostics and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pump is dedicated to CO2 intake in CO2-based chromatography system, then CO2-based chromatography function is ensured, but the system cannot be configured for HPLC or UPLC without time and labor intensive reconfiguration
Solution Approach 1:
The pump system is designed to perform multiple functions by accepting different fluid sources. A selector valve enables the pump to intake either CO2 from a CO2 source or liquid solvent from a solvent source, allowing the same hardware to function for both CO2-based chromatography and HPLC/UPLC without dedicated pumps for each mode.
Solution Approach 2:
The system incorporates a dynamically switchable fluid intake mechanism through the selector valve, which can change the pump's fluid source between CO2 and liquid solvent based on operational requirements. This dynamic reconfiguration eliminates the need for physical reassembly or dedicated hardware for different chromatography modes.
2Adaptability or versatility
If a pump is dedicated to CO2 intake in CO2-based chromatography system, then CO2-based chromatography function is ensured, but reconfiguration requires labor intensive work
Solution Approach 1:
The pump system is designed to perform multiple functions by accepting different fluid sources. A selector valve enables the pump to intake either CO2 from a CO2 source or liquid solvent from a solvent source, allowing the same hardware to function for both CO2-based chromatography and HPLC/UPLC without dedicated pumps for each mode.
3Reliability
If CO2 is maintained at elevated pressure to remain liquid, then CO2-based chromatography operates correctly, but switching to HPLC/UPLC requires system reconfiguration
Solution Approach 1:
The selector valve acts as an intermediary device that manages the transition between different fluid sources and pressure conditions. It enables the pump to switch between CO2 (at elevated pressure) and liquid solvent (at different pressure conditions) without requiring system reconfiguration, thereby maintaining reliable operation across different chromatography modes.
4Productivity
If the system is configured for CO2-based chromatography with dedicated CO2 pump, then CO2 chromatography performance is optimized, but HPLC/UPLC operation is not possible without reconfiguration
Solution Approach 1:
The pump system is designed to perform multiple functions by accepting different fluid sources. A selector valve enables the pump to intake either CO2 from a CO2 source or liquid solvent from a solvent source, allowing the same hardware to function for both CO2-based chromatography and HPLC/UPLC without dedicated pumps for each mode.
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
Enables seamless switching between CO2-based, HPLC, and UPLC modes, reducing system downtime and operator risk, while allowing for efficient fluid management and maintenance, thus enhancing the system's operational flexibility and safety.
Implementation Method 1
a selector valve configured to switch between a first position, in which the selector valve provides a fluidic pathway between the inlet of the actuator and a source of fluid maintained at a first pressure, and a second position, in which the selector valve provides a fluidic pathway between the inlet of the actuator and a source of pressurized fluid maintained at a pressure greater than atmospheric pressure
Data Source
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AI summary
A liquid chromatography system includes a pumping system with a selector valve in fluidic communication with a pump inlet. The selector valve switches between a first position, in which the selector valve fluidically couples a solvent reservoir to the pump inlet, and a second position, in which the selector valve fluidically couples a pressurized source of liquefied carbon dioxide (for example) to the pump inlet. The liquid chromatography system can perform as a HPLC system (or as an UPLC system) when the selector valve is in the first position and as a CO2-based chromatography system when the selector valve is in the second position. The selector valve can have a third position in which both the fluidic pathway between the solvent reservoir and the pump inlet and the fluidic pathway between the pressurized source and the pump inlet are blocked. This shut-off position advantageously facilitates system maintenance.