Microvalve Control Valve for Sensitive Fluid Isolation
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Solution Overview
Problem
Microvalves struggle to effectively control the flow of certain fluids, such as biological fluids, without heating them, due to limitations in existing designs.
Innovation Solution
A valve assembly with a first stage microvalve controlling a second stage valve, where the first fluid acts on the second stage to move it between open and closed positions, isolating the second fluid from the first fluid and using a diaphragm and piston mechanism to regulate flow without heating the second fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a microvalve is used to control fluid flow, then the valve size is reduced and precision is improved, but the ability to control sensitive fluids without heating them deteriorates
Solution Approach 1:
The valve is divided into two separate stages: a first stage microvalve for controlling fluid flow with high precision, and a second stage valve for regulating flow of sensitive fluids. The microvalve operates at a reduced scale with features in the micrometer range to achieve precise control, while the second stage valve handles the sensitive fluid to prevent heating, thus resolving the contradiction between precision and harmful thermal effects
Solution Approach 2:
A diaphragm is introduced as an intermediary component between the first stage microvalve and the second stage valve. The diaphragm is positioned between the first fluid from the microvalve and the second sensitive fluid, allowing the microvalve to control the system while the diaphragm prevents direct contact that would cause heating of the sensitive fluid
2Device complexity
If a single stage valve is used, then the device complexity is reduced, but the ability to isolate and protect sensitive fluids from the control fluid deteriorates
Solution Approach 1:
The valve system is segmented into two distinct stages with separate fluid circuits. The first stage microvalve controls the first fluid, while the second stage valve regulates the second sensitive fluid. This segmentation allows each stage to be optimized for its specific function, with the first stage providing precise control and the second stage protecting the sensitive fluid, thereby improving reliability without excessive complexity
Solution Approach 2:
The diaphragm serves as a mediator that physically separates the first fluid circuit from the second fluid circuit. It transmits the control action from the first stage microvalve to the second stage valve while maintaining complete isolation between the two fluids, ensuring that the sensitive second fluid never contacts the control first fluid
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
The valve assembly efficiently controls the flow of isolated fluids, preventing undesired temperature changes, particularly beneficial for sensitive fluids like blood and blood products.
Implementation Method 1
the first fluid acts on the second valve stage to move the second valve stage between open and closed positions
Implementation Method 2
using a diaphragm and piston mechanism to regulate flow
Data Source
AI summary
A valve assembly is configured to regulate the flow of an isolated fluid therethrough and includes a first valve stage configured to control the flow of a first fluid through a first fluid circuit, and a second valve stage configured to control the flow of a second fluid through a second fluid circuit. The first valve stage is connected to the second valve stage such that the first fluid acts on the second valve stage to move the second valve stage between open and closed positions. The second fluid flowing through the second valve stage is also isolated from the first fluid flowing through the first valve stage.