Cam-Profile Servo Valve for Compact High-Flow Pressure Control
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Solution Overview
Problem
Conventional servo valve systems are bulky, complex, and prone to contamination and leakage, especially when handling large fluid flows at high pressures and frequencies, requiring large orifice areas and multiple moving parts that increase power consumption and vulnerability to failure.
Innovation Solution
A compact servo valve assembly with a torsion spring positioning mechanism and a cam-profiled flapper element that eliminates the need for extensive fluid channels and feedback sensors, allowing for dynamic fluid flow control and reduced size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional servo valve systems use large orifice areas to handle large fluid flows at high pressures, then fluid flow capacity is improved, but device size and weight increase
Solution Approach 1:
The valve body is divided into multiple sections with separate fluid channels for different functions (supply, exhaust, control). This segmentation allows compact arrangement of flow paths while maintaining adequate orifice areas for high fluid flow capacity, resolving the contradiction between handling large flows and keeping the valve compact.
2Measurement precision
If conventional servo valve systems use multiple moving parts to achieve precise control, then control precision is improved, but device complexity and vulnerability to failure increase
Solution Approach 1:
The control valve and main valve are integrated into a single compact assembly with shared components. The control piston is directly coupled to the main valve spool, eliminating the need for separate feedback mechanisms and reducing the number of moving parts while maintaining precise control through direct mechanical linkage.
Solution Approach 2:
The main valve spool serves multiple functions: it acts as both the control element for fluid distribution and the position feedback element. The same component that controls fluid flow also provides position information through its displacement, reducing the need for additional specialized parts and simplifying the overall system.
3Stress or pressure
If conventional servo valve systems use large valve components to handle high pressure fluid flows, then pressure handling capacity is improved, but power consumption increases
Solution Approach 1:
The system uses hydraulic fluid under pressure to transmit control forces from the control piston to the main valve spool. This hydraulic transmission mechanism allows small control forces to move large valve components, reducing the power consumption of the control motor while maintaining adequate pressure handling capacity through properly sized orifices and pressure chambers.
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 results in a more responsive, lightweight, and reliable servo valve system that efficiently manages high fluid flows with lower power consumption and reduced vulnerability to contamination and leakage, while maintaining precise control and compact design.
Implementation Method 1
a torsion spring positioned inside the valve housing and engaged to the flapper element to bias the flapper element towards a neutral position
Implementation Method 2
a cam-profiled flapper element that eliminates the need for extensive fluid channels and feedback sensors, allowing for dynamic fluid flow control
Implementation Method 3
a motor controlled by a control current which controls fluid flow to or from an actuator
Data Source
AI summary
A servo valve includes: a fluid transfer valve assembly comprising a supply port and a control port (PA, PB); a moveable valve spool arranged to regulate flow of fluid from the supply port to the control port in response to a control signal; and a drive means configured to axially move the valve spool relative to the fluid transfer assembly in response to the control signal to regulate the fluid flow. The drive means comprises an elongate member arranged to rotate in response to the control signal. The elongate member has a cam profile in the fluid flow path such as to vary the pressure acting on the ends of the spool as the cam profile rotates.