Needle Seat Vent Valve for CO2 Chromatography Pressure Control
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Solution Overview
Problem
Conventional vent valves in CO2-based chromatography systems increase the system volume, compromising the ability of back pressure regulators to control pressure effectively, leading to slower pressure control and potential leaks at higher pressures.
Innovation Solution
The design of vent valves with a needle and seat configuration that minimizes the exposed volume of the valve body, utilizing a needle with an angular sealing surface that self-centers and aligns during translation, and a pressure assist from the system pressure to enhance sealing, reducing the internal volume and improving pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vent valves are used in CO2-based chromatography systems, then the valve can provide basic venting function, but the system volume increases which compromises pressure control ability
Solution Approach 1:
The needle is disposed inside the bore of the seat, with the needle stem positioned within the bore space. This nested configuration allows the sealing components to occupy minimal volume while maintaining full venting functionality, thereby reducing system volume without compromising pressure control reliability
Solution Approach 2:
The invention extracts only the essential venting function from a conventional valve design, eliminating unnecessary components and volume. By using a simple needle-seat configuration rather than a full valve assembly, the design achieves venting capability with minimal system volume impact
2Productivity
If conventional vent valves are used, then basic venting is achieved, but pressure control speed decreases
Solution Approach 1:
The compact nested arrangement of needle within seat bore minimizes the volume of fluid that must be pressurized or vented, enabling faster pressure response and control speed while maintaining effective venting function
3Productivity
If higher pressures are used in CO2-based chromatography, then separation efficiency improves, but leaks increase
Solution Approach 1:
The needle features an angular sealing surface at its tip, concentrating sealing capability precisely where needed at the needle-seat interface. This localized quality enhancement ensures reliable sealing under high pressure conditions, enabling efficient separations without leakage
Solution Approach 2:
The angular sealing surface design converts the high system pressure, which could cause leaks, into a beneficial force that presses the needle tip against the seat bore, enhancing the seal. The pressure that would otherwise be harmful is instead utilized to improve sealing performance
4Reliability
If needle with angular sealing surface is used, then sealing is enhanced, but manufacturing complexity increases
Solution Approach 1:
The angular sealing surface is formed by changing the geometric parameters of the needle tip during manufacturing. This parameter change creates an self-centering effect that enhances sealing reliability while remaining compatible with standard manufacturing processes
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 configuration allows for improved pressure control and reduced leakage, enabling faster and more precise control of pressure in CO2-based chromatography systems, enhancing the efficiency and reliability of chromatographic separations.
Implementation Method 1
The needle can include an angular sealing surface between the needle stem and the needle head for self-centering and aligning the needle during translation through the seat
Implementation Method 2
In addition, a pressure force, i.e., a pressure assist from the system pressure, can be implemented to enhance the durable and/or tight seal against the angular sealing surface
Implementation Method 3
The needle can be configured to be pulled through the seat to stop flow through the bore
Data Source
AI summary
Exemplary embodiments are directed to vent valves, systems and methods generally involving a valve body that includes a seat retainer, a needle and a seat. The seat includes a bore extending there through and the needle includes a needle stem and a needle head. The seat is disposed inside the seat retainer. The needle stem is disposed inside the bore. The needle is configured to be pulled through the seat to stop flow through the bore. Exemplary embodiments are further directed to a system including a stem return spring mechanism and a solenoid return spring mechanism. A processing device is configured to actuate the solenoid return spring mechanism to permit the stem return spring mechanism to pull the needle through the seat to stop flow through the bore.