Phase-Change Valve Flow Control Without Mechanical Contact
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Solution Overview
Problem
Conventional valves rely on moving mechanical parts and surface contact to control fluid flow, which can be ineffective in handling corrosive, radioactive, or high-temperature fluids, and require complex mechanisms to manage flow rates accurately.
Innovation Solution
The use of a heat exchange element to induce a phase change in the fluid, forming a solid plug that can grow or shrink to control the flow rate by varying the heat transfer rate, allowing the valve to transition between open and closed states without mechanical parts or surface contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valves use moving mechanical parts and surface contact to control fluid flow, then the valve structure is simple and easy to manufacture, but the valve becomes ineffective in handling corrosive, radioactive, or high-temperature fluids and requires complex mechanisms to manage flow rates accurately
Solution Approach 1:
The patent replaces conventional mechanical valve components (plugs, diaphragms, plungers) with a heat exchange element that uses thermal energy to control fluid flow. The heat exchange element induces phase change in the subject fluid to form a solid plug, eliminating the need for mechanical moving parts that contact the fluid. This substitution resolves the contradiction by providing reliability in harsh environments without requiring complex mechanical mechanisms.
Solution Approach 2:
The patent utilizes phase transition of the subject fluid as the core mechanism for flow control. The heat exchange element transfers thermal energy to or from the subject fluid, causing it to transition between liquid and solid phases. When the fluid solidifies, it forms a plug that blocks flow; when melted, flow is restored. This phase transition mechanism provides simple yet effective flow control without complex mechanical parts, resolving the technical contradiction.
2Measurement precision
If conventional valves use moving mechanical parts to control flow, then the device structure is simple, but the flow rate control precision is limited and mechanical wear occurs
Solution Approach 1:
The patent changes the physical state parameter of the subject fluid (from liquid to solid phase) to achieve flow control. By controlling the thermal energy transferred through the heat exchange element, the system can precisely adjust the degree of solidification and resulting flow restriction. This parameter change approach enables precise flow rate control without complex mechanical adjustment mechanisms, resolving the contradiction between precision and structural simplicity.
3Reliability
If conventional valves rely on surface contact between plug and seat, then the manufacturing is easy, but the valve is ineffective for corrosive fluids and requires frequent maintenance
Solution Approach 1:
The patent extracts and eliminates the mechanical plug and seat components that require surface contact from the valve system. Instead, flow control is achieved through phase change of the subject fluid itself, which forms a solid plug without requiring separate mechanical sealing components. This extraction of mechanical contact elements resolves the contradiction by eliminating corrosion and wear issues while maintaining manufacturing simplicity through the use of a single heat exchange element.
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 solution enables precise control of fluid flow rates in challenging environments, reducing reliance on mechanical parts and surface contact, and is particularly effective for corrosive or radioactive fluids, such as those used in nuclear reactors, by using a heat exchange element to manage the phase change of the fluid.
Implementation Method 1
the heat exchange element positioned and configured to induce a localized phase change in the subject fluid to form a uniform a solid plug from the subject fluid
Implementation Method 2
A heat transfer rate of the heat exchange element may be variable to control a rate of flow of the subject fluid through the valve
Data Source
AI summary
Valves may include an opening sized and shaped to permit a subject fluid to flow through the opening when the opening is unobstructed. A heat exchange element may be located proximate to the opening, the heat exchange element positioned and configured to induce a localized phase change in the subject fluid to form and unform a solid plug from the subject fluid around at least a portion of the heat exchange element. A heat transfer rate of the heat exchange element may be variable to control a rate of flow of the subject fluid through the valve by controlling a size of the solid plug from the subject fluid.