Rotary Spool Servo Valve for High-Flow Reliable Control
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Solution Overview
Problem
Conventional servo valve systems are bulky, complex, and prone to failure due to large size and multiple moving parts, which complicates manufacturing, assembly, and reduces responsiveness and reliability, especially when handling high fluid flows and high operation frequencies.
Innovation Solution
A servo valve assembly with a simplified design featuring a spool assembly and drive assembly using permanent magnets and coils to rotate the spool, reducing the number of complex parts and improving manufacturing ease, while maintaining compactness and responsiveness, by aligning spool openings with fluid channels to control fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional servo valve systems use large valve orifices and multiple moving parts to handle high fluid flows, then the fluid flow capacity is improved, but the device size increases and reliability decreases
Solution Approach 1:
The patent extracts and eliminates unnecessary moving parts from the conventional servo valve system. Specifically, it removes the flapper, nozzle, and feedback spring mechanisms, retaining only the essential spool valve component. This extraction reduces the number of potential failure points while maintaining the core fluid flow control function, thereby improving reliability without sacrificing flow capacity.
Solution Approach 2:
The patent segments the servo valve into distinct functional zones within a single spool component: a metering zone for flow control and a feedback zone for position sensing. This segmentation allows each zone to be optimized independently for its specific function while being integrated into a unified structure, improving both reliability and flow handling capability.
2Adaptability or versatility
If conventional servo valve systems use multiple moving parts and complex construction, then the fluid flow control capability is improved, but the device complexity increases and manufacturing difficulty increases
Solution Approach 1:
The patent merges the metering function and feedback function into a single integrated spool valve structure. The spool contains both the metering openings for flow control and the feedback openings for position sensing, eliminating the need for separate flapper, nozzle, and feedback spring assemblies. This merging maintains full fluid flow control capability while dramatically reducing construction complexity.
Solution Approach 2:
The spool valve component performs multiple functions simultaneously: it meters fluid flow through its metering openings, provides position feedback through its feedback openings, and acts as the sole moving part for control. This multi-functionality eliminates the need for separate dedicated components for each function, reducing overall device complexity while maintaining adaptability.
3Productivity
If conventional servo valve systems use long fluid paths and multiple channels, then the fluid flow management is improved, but the response time increases
Solution Approach 1:
The patent extracts and eliminates the long fluid paths and multiple intermediate channels found in conventional systems. By removing the flapper-nozzle feedback mechanism and feedback springs, the fluid path is shortened to direct connections between the spool valve and actuator. This extraction maintains effective fluid flow management while significantly reducing response time.
4Quantity of substance
If conventional servo valve systems use large component sizes to handle high flows, then the fluid flow capacity is improved, but the device volume increases
Solution Approach 1:
The patent segments the fluid flow control into concentrated zones within the spool valve: small precision metering openings for flow control and small feedback openings for position sensing. This segmentation allows high fluid flow capacity to be achieved through optimized flow dynamics in compact zones rather than requiring large overall component dimensions, thereby reducing device volume.
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 efficient handling of large fluid flows at high frequencies with fewer expensive and complex parts, simplifying manufacturing and assembly, and enhancing the reliability and responsiveness of the servo valve system.
Implementation Method 1
a spool assembly and drive assembly which rotates the spool to align the spool openings with the fluid channels
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A servo valve comprising: a fluid transfer valve assembly comprising a supply port (61) and a control port (62); a valve spool (70) arranged to regulate flow of fluid from the supply port (13) to the control port in response to a control signal; and a drive means (50) configured to move the valve spool relative to the fluid transfer assembly in response to the control signal to regulate the fluid flow; wherein the drive means is arranged to rotate the spool relative to the fluid transfer assembly, the spool provided with openings (71,72) arranged to selectively align with or block flow channels (67, 68) in the fluid transfer assembly according to the direction and degree of rotation of the spool.