Rotary Valve Flow Mixing and Cracking Pressure Control
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Solution Overview
Problem
Conventional medical systems require a large number of valves to manage fluid flows in dialysis systems, leading to complexity and potential errors in fluid composition, especially in controlling fluid flow rates and mixing ratios.
Innovation Solution
The development of rotary valves that are rotatable about a central axis, featuring a plug movable between axial positions to control fluid flow direction and pressure, allowing for adjustable cracking pressures and fluid flow rates, and capable of mixing ratios, simplifying the system by reducing the number of valves needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valves are used to manage fluid flows in dialysis systems, then fluid flow control is achieved, but the number of valves increases leading to system complexity and potential errors
Solution Approach 1:
The patent combines multiple valve functions into a single rotary valve assembly with a rotating body that integrates multiple flow paths and control mechanisms. The rotary valve body incorporates multiple seals, flow channels, and actuation interfaces in one unified structure, replacing what would traditionally require multiple separate valves to achieve the same fluid management capabilities.
Solution Approach 2:
The rotary valve is designed to perform multiple functions simultaneously - it can control bidirectional fluid flow, regulate flow rates, mix fluids in specific ratios, and isolate different fluid paths all through a single device. The rotating mechanism allows one valve body to assume the roles of multiple conventional valves, providing universal fluid management for the dialysis system.
2Measurement precision
If multiple valves are used to control fluid flow rates and mixing ratios, then flow control precision is improved, but the potential for manual errors in fluid composition increases
Solution Approach 1:
The rotary valve incorporates internal flow regulation mechanisms that automatically maintain precise flow rates and mixing ratios without requiring manual adjustment. The design includes built-in flow restriction channels and proportional opening mechanisms that self-regulate fluid composition based on the valve's rotational position, eliminating the need for operators to manually calculate and adjust multiple flow parameters.
Solution Approach 2:
The valve controls fluid flow parameters by changing its rotational position, which simultaneously adjusts multiple flow rates and mixing ratios through pre-designed flow channels. This parameter-based control method allows precise fluid composition management through a single rotational action rather than multiple independent adjustments, reducing the opportunity for human error.
3Adaptability or versatility
If a rotary valve with adjustable cracking pressure is used, then fluid flow control versatility is improved, but the valve structure complexity increases
Solution Approach 1:
The rotary valve incorporates a dynamic adjustment mechanism where the cracking pressure can be changed during operation by rotating the valve body to different angular positions. The internal geometry of the rotary valve creates varying seal contact pressures and flow channel openings as it rotates, allowing the cracking pressure to be dynamically adjusted without adding separate adjustment mechanisms or increasing overall structural 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 design simplifies medical system architecture by reducing the total number of valves, enhancing operational robustness, and eliminating manual errors in dialysate preparation by enabling selective fluid flow control and mixing.
Implementation Method 1
a compressible member within the interior channel that biases the plug to the first axial position
Implementation Method 2
a protrusion of the cam is aligned with and squeezes the compressible member into a compressed configuration that exerts a first cracking pressure on the plug
Implementation Method 3
the plug closes the axial opening to prevent the fluid from flowing through the axial opening in a first direction and to prevent the fluid from flowing through the axial opening in a second direction
Implementation Method 4
In the second axial position, the plug permits the fluid to flow through the axial opening into the interior channel in the first direction
Data Source
AI summary
In one aspect, a valve includes an interior channel for permitting a fluid to flow through the valve and an opening to the interior channel, the opening including a circular portion and a tapered portion adjacent the circular portion, the tapered portion having a maximum width that is less than a diameter of the circular portion, wherein the valve is rotatable about a central axis of the valve to adjust a position of a cross-sectional area of the opening with respect to a cross-sectional area of an inlet fluid line positioned to deliver the fluid to the rotary valve.