Rotary Injection Valve Stator with Internal Sample Load Channel
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Solution Overview
Problem
Current liquid chromatography injection systems face challenges in accurately handling small sample volumes due to manufacturing limitations in tubing inner diameter tolerances, requiring higher pressures and being unsuitable for high-pressure systems, which leads to surface damage and reduced valve lifetime.
Innovation Solution
A rotary injection valve with a stator featuring an internal sample load channel formed through diffusion bonding, allowing for precise control of sample volume and pressure resistance, eliminating the need for external tubing and reducing surface wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external tubing is used for sample injection, then sample loading is possible, but manufacturing tolerance limitations cause significant volume variation and require higher pressures
Solution Approach 1:
The sample loop is merged with the stator body by forming it as an integrated internal channel within the stator, eliminating the need for separate external tubing. This integration ensures precise sample volume definition through controlled internal geometry while withstanding high pressures, as the stator body itself is designed to tolerate the required loading pressures without the limitations of external tubing.
2Duration of action of stationary object
If external tubing is used for sample injection, then sample loading is possible, but surface wear occurs and valve lifetime is reduced
Solution Approach 1:
The sample loop is merged with the stator body as an internal channel, eliminating the interface between external tubing and the stator sealing surface. This removes the source of surface wear that occurs when external tubing contacts the sealing surface, thereby extending valve lifetime.
Solution Approach 2:
The sample loop is nested within the stator body as an internal channel rather than being external. This nesting protects the sample loop from surface wear at the sealing interface, as it is embedded within the pressure-resistant stator structure rather than contacting the sealing surface directly.
3Strength
If internal sample load channel is embedded in stator, then pressure resistance and volume precision are improved, but device complexity increases
Solution Approach 1:
The sample loop and stator body are merged into a single integrated structure, with the sample loop formed as an internal channel within the stator. This integration improves pressure resistance by eliminating weak external connections and defines precise sample volumes through controlled internal geometry, while the merging process itself reduces overall device complexity by eliminating separate components.
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 accurate and efficient injection of small sample volumes across a wide range of pressures, improving valve longevity and integration into chromatographic systems by embedding the sample load channel within the stator, reducing pressure drops and loading times.
Implementation Method 1
A diffusion bonding process is performed on the aligned first and second sections of the single button body to form a single button body having a sample load channel inside the button body below the stator sealing surface.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A rotary injection valve used in chromatography includes a stator having a stator sealing surface and a sample load channel disposed inside the stator body below the stator sealing surface. The valve can have a reduced number of ports thereby allowing faster integration of the valve into a chromatographic system. Flow restriction is reduced compared to valves that use an external sample loop for a similar volume of sample. The lack of stator ports for the sample load channel eliminates the potential for carryover created by external valve couplings. Another advantage is the reduction of surface wear achieved by locating the sample load channel below the stator sealing surface.