Three-Port Valve Diaphragm Spring Centering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Three-port valves used in extreme environments like space vehicles face issues with off-centering of valve members due to vibratory stress, leading to potential damage and reduced reliability and response speed.
Innovation Solution
Incorporating diaphragm springs that provide high stiffness in their plane to maintain centering with negligible friction, along with an actuator for controlled movement and a return spring for automatic positioning, ensuring the valve members remain aligned and centered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rod is guided through a narrow bore in the casing to prevent off-centering, then the valve members remain centered, but friction increases causing the valve to slow down and risk jamming
Solution Approach 1:
The patent introduces diaphragm springs as intermediary elements between the rod and the casing. These springs provide centering forces to keep valve members aligned with their seats without requiring direct mechanical contact through narrow bores. The diaphragm springs act as mediators that transmit centering forces while allowing frictionless movement of the rod along the movement axis, thus resolving the contradiction between maintaining centering and preserving response speed.
2Ease of operation
If the rod is allowed to move freely without guidance, then friction is minimized and response speed is improved, but the valve members move off-center leading to damage and reduced reliability
Solution Approach 1:
The patent replaces the traditional mechanical guidance system (narrow bore) with a spring-based centering mechanism. Instead of using rigid mechanical constraints that create friction, the invention uses the elastic properties of diaphragm springs to provide centering forces. This substitution eliminates frictional forces while maintaining the centering function, thereby improving response speed while preserving reliability.
3Reliability
If a narrow bore is used to guide the rod, then off-centering is prevented, but the valve structure becomes more complex and friction increases
Solution Approach 1:
The patent employs diaphragm springs, which are flexible elastic elements, to provide centering forces. These thin film-like springs replace the rigid narrow bore structure, offering a more elegant solution that maintains centering while reducing structural complexity. The flexible nature of the diaphragm springs allows them to conform to the movement of the rod without creating rigid constraints, thus simplifying the overall valve structure while maintaining reliability.
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 solution enables high-reliability, zero-friction switching between positions, enhancing the valve's ability to withstand vibratory environments and maintain rapid response and reliability.
Implementation Method 1
at least one diaphragm spring supporting the movable element in a plane substantially perpendicular to a movement axis between the first and second positions. Since such a diaphragm spring presents stiffness in its own plane that is much greater than the stiffness it presents on an axis perpendicular to its own plane, it thus enables the centering of the movable element to be maintained with friction that is nearly zero.
Implementation Method 2
a return spring for urging the movable element towards the first position
Data Source
AI summary
A three-port valve including a casing and a movable element received in the casing. The casing includes a fluid inlet, first and second fluid outlets, a first fluid-flow passage between the fluid inlet and the first fluid outlet, and a second fluid-flow passage between the first and second fluid outlets. The movable element includes a rod, a first valve member fastened to a first end of the rod and configured to be received towards the rod in a first valve seat for closing the first fluid-flow passage, and a second valve member fastened to a second end of the rod and configured to be received towards the rod in a second valve seat of the casing for closing the second fluid-flow passage. The valve also includes at least one diaphragm spring supporting the movable element in a plane substantially perpendicular to a movement axis between first and second positions.