Hydrostatic Valve Arrangement for Flushing Pressure Control
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Solution Overview
Problem
Reversible hydrostatic drives face issues with pressure loss and cavitation during flushing due to the inability of traditional flushing valves to quickly adjust to dynamic changes in hydraulic circuits, leading to potential damage and inefficiency.
Innovation Solution
A hydrostatic valve arrangement with a pressure valve and an adjusting device that allows for finer control over the flushing process by adjusting the opening pressure, enabling continuous regulation of the flushing pressure medium flow, and incorporating a directional valve with multiple positions and a throttle for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional flushing valve is used to discharge heated pressure medium, then the pressure medium can be flushed from the hydraulic circuit, but the valve body cannot follow the high adjustment dynamics of hydraulic machines, causing pressure drops and cavitation
Solution Approach 1:
The invention makes the flushing valve dynamically adjustable by replacing the traditional pressure-dependent valve body positioning with an active adjusting device (electromagnetic or electro-hydraulic) that can rapidly change the opening cross-section in response to control signals, matching the adjustment dynamics of hydraulic machines while maintaining pressure stability
Solution Approach 2:
The control device receives information about the operating state of the hydraulic circuit and automatically adjusts the opening cross-section of the flushing valve accordingly, creating a feedback loop that prevents pressure drops and cavitation by anticipating or responding to dynamic changes in the circuit
2Reliability
If a pressure limiting valve is used to maintain pressure during flushing, then pressure stability is improved, but the flushing quantity can only be controlled in binary states (maximum or zero)
Solution Approach 1:
The invention replaces the binary on/off control of traditional pressure limiting valves with a continuously adjustable opening cross-section controlled by an adjusting device, enabling proportional control of flushing quantity while maintaining pressure stability through dynamic adaptation to circuit conditions
Solution Approach 2:
The invention changes the controlling parameter from binary valve states to a continuously variable opening cross-section, allowing the flushing quantity to be modulated across a wide range while the control device maintains pressure stability by adjusting the cross-section in response to circuit conditions
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 solution allows for precise control between flushing and shutoff states, preventing pressure drops and cavitation, enhancing the efficiency and reliability of hydrostatic drives by enabling adaptive pressure management during dynamic operations.
Implementation Method 1
The force equilibrium includes at least one pressure equivalent, in particular the spring force of a spring, which acts on the valve body in the direction of a blocking or increasing throttling of the pressure medium flow path
Implementation Method 2
an opening pressure, which acts in the direction of an opening or decreasing throttling of the pressure medium flow path and is dependent on the pressure at the output connection
Data Source
AI summary
A hydrostatic valve arrangement for flushing pressure medium from a working line of a hydraulic circuit includes a flushing valve with a first flushing connection for connecting to a first working line and an output connection for connecting to a pressure medium sink. The arrangement also includes a pressure valve arranged in a pressure medium flow path of the arrangement from the output connection in the direction of the pressure medium sink. The pressure valve has a valve body on which a force equilibrium is formed. The force equilibrium includes a pressure equivalent that acts on the valve body in a direction that blocks the pressure medium flow path and an opening pressure that acts in a direction that opens the pressure medium flow path and is dependent on the pressure at the output connection. The arrangement further includes an adjusting device for shifting the force equilibrium.