Hydraulic Pilot Valve with Feedback for Fast Switching
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Solution Overview
Problem
Conventional hydraulic pilot valves in hydraulic systems face challenges in quickly and accurately switching between open and closed positions, particularly in high-pressure applications, where the reliability of fluidic communication between ports is critical for efficient operation of hydraulically actuated devices.
Innovation Solution
A fast switching hydraulic pilot valve design featuring a spool that moves between first and second positions within a valve bore, utilizing an actuator and pressure feedback mechanisms to control fluidic communication between ports, with an optional spring for biasing the spool, and a solenoid controlled via PWM drives for precise actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional hydraulic pilot valve is used, then the valve can control fluid flow between ports, but the switching speed between open and closed positions is slow and unreliable in high-pressure applications
Solution Approach 1:
The patent implements hydraulic feedback by connecting a feedback port to the spool chamber, allowing pressure from the controlled port to act on the spool and accelerate its movement. This feedback mechanism creates a self-reinforcing effect where pressure differential drives the spool faster toward its target position, enabling rapid and reliable switching even in high-pressure applications.
Solution Approach 2:
The patent utilizes hydraulic pressure differentials to drive spool movement instead of relying solely on mechanical actuation or spring force. By applying pressure from the controlled port to the spool chamber and using feedback pressure, the system achieves fast and reliable switching through hydraulic forces that scale with system pressure.
2Ease of operation
If an actuator is used to move the spool to the first position, then fluidic communication between ports can be established, but the valve may fail to return to the closed position reliably
Solution Approach 1:
The feedback connection from the controlled port to the spool chamber ensures that pressure differential automatically drives the spool back to the closed position. When the actuator deactivates, the feedback pressure mechanism ensures reliable return without requiring additional mechanical springs or counter-balancing forces.
Solution Approach 2:
The valve uses its own controlled pressure to drive spool movement and return. The system is self-actuating through hydraulic feedback, where the controlled port's pressure serves both the load and the spool actuation, eliminating dependence on external spring forces or complex return mechanisms.
3Reliability
If a spring is used to bias the spool to the second position, then the valve can return to closed position, but the system becomes more complex and may fail in high-pressure applications
Solution Approach 1:
The patent replaces mechanical spring biasing with hydraulic pressure differential. The spool chamber is connected to the controlled port, allowing hydraulic pressure to directly bias the spool to the closed position. This eliminates the need for springs and reduces mechanical complexity while maintaining reliability in high-pressure applications.
Solution Approach 2:
The valve uses the controlled pressure itself to provide the biasing force needed for spool return, rather than requiring an independent spring mechanism. This self-service approach reduces component count and eliminates potential failure points associated with springs in high-pressure environments.
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
Enables rapid and reliable switching between open and closed states, ensuring efficient fluidic communication and maintaining valve operation even in the event of spring failure, through the use of pressure feedback and PWM control, enhancing the performance and reliability of hydraulic systems.
Implementation Method 1
an actuator configured to move the spool to the first position within the valve body when the actuator is actuated
Implementation Method 2
Exposure of the spool to a pressure at an end of the spool proximate the actuator allows for movement of the spool to a second position within the valve bore
Data Source
AI summary
Provided is a fast switching hydraulic pilot valve with hydraulic feedback for quickly and accurately switching between opened and closed positions of the hydraulic valve. The hydraulic valve includes a valve body, a valve bore defined by the valve body, a plurality of valve ports extending through the valve body and into the valve bore, and an actuator. Actuation of the actuator allows for movement of the spool to a first position within the valve bore, thereby providing for one of opening or closing the hydraulic valve. Exposure of the spool to a pressure at an end of the spool proximate the actuator allows for movement of the spool to a second position within the valve bore, thereby providing for the other of opening or closing the hydraulic valve.