Valve Spool Groove Geometry for Low-Force Quick Switching
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Solution Overview
Problem
Existing quick-acting valves require significant force to open due to opposing hydrodynamic axial forces, which hinder efficient movement and energy consumption.
Innovation Solution
The design features a valve slide with axially spaced grooves, including inlet-side and outlet-side cone sections with specific angles of inclination, supporting the opening movement by generating axial forces that assist in overcoming the return spring's force, and a central cone section with minimal inclination to facilitate quick opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional groove designs with symmetric conical sections are used, then the valve structure is simple and manufacturing is easy, but significant axial force is required to open the valve due to opposing hydrodynamic forces
Solution Approach 1:
The patent applies asymmetry by designing the first groove with a drain-side conical section having an inclination angle of less than 40 degrees (preferably 25-35 degrees), which is significantly less than the conventional symmetric design. This asymmetric groove geometry creates favorable hydrodynamic conditions that generate axial force in the opening direction, reducing the force required to open the valve while maintaining manufacturing feasibility.
Solution Approach 2:
The patent applies local quality by creating different conical sections with specific inclination angles at different locations within the groove. The drain-side conical section has a specific angle (less than 40 degrees) optimized for generating opening force, while the inlet-side conical section has a different angle (less than 90 degrees) optimized for generating additional opening force. This localized optimization of groove geometry addresses the force requirement without requiring complete redesign of the entire valve structure.
2Productivity
If the valve spool is moved quickly to enable rapid switching, then productivity is improved, but the energy consumption increases due to the force required to overcome hydrodynamic resistance
Solution Approach 1:
The patent converts the harmful hydrodynamic resistance into a beneficial force by designing the asymmetric groove geometry that generates axial force in the opening direction. The flow through the specially angled conical sections creates pressure distribution that produces a force assisting the opening movement, thereby converting the energy that would normally be lost to hydrodynamic resistance into useful work that aids rapid switching while reducing overall energy consumption.
3Force
If symmetric conical sections with standard inclination angles are used, then manufacturing precision requirements are moderate, but the axial force in closing direction is too high, hindering efficient opening movement
Solution Approach 1:
The patent applies parameter changes by modifying the inclination angle parameter of the drain-side conical section to be less than 40 degrees (preferably 25-35 degrees), which is a significant deviation from conventional symmetric designs. This parameter change fundamentally alters the hydrodynamic characteristics, reducing the axial force in the closing direction by creating favorable pressure distribution that generates opening force, while the specified angle range provides clear manufacturing guidelines that balance precision requirements with performance benefits.
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 reduces the axial force required for closing and enhances the opening movement, allowing for rapid and efficient operation of the quick-acting valve, especially in normally-open configurations, while minimizing energy consumption.
Implementation Method 1
When flow passes through the first groove in the closing direction, an axial force in the opening direction is generated via this inlet-side conical section. The angle of inclination of the outlet-side cone section results in a reduced axial force in the closing direction when flowing through the first groove.
Data Source
Figure 1
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Figure 4~4a
AI summary
Revealbart is a quick-switching valve with two grooves in the valve spool that allow flow simultaneously in different axial directions. The first groove is optimized to amplify an axial force opposite to the flow direction through the groove. The second groove is optimized for its volumetric flow rate even at small opening cross-sections.