Hydraulic Steering Valve Layout for Lower Pressure Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydraulic steering devices experience significant pressure losses due to the placement of the release and shutoff valve between the flow regulation valve arrangement and the steering cylinder, leading to inefficiencies when no steering request is made.
Innovation Solution
The release and shutoff valve is positioned between the flow regulation valve arrangement and the supply system, allowing it to close when no steering movement is requested, while the return flow valves open, thereby compensating load pressure and reducing internal pressure losses, allowing for larger oil flow and optimized valve design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the release and shutoff valve is connected between the flow regulation valve arrangement and the steering cylinder, then the steering cylinder can be controlled, but pressure losses increase significantly
Solution Approach 1:
The release and shutoff valve is extracted from its traditional position between the flow regulation valve arrangement and steering cylinder, and repositioned between the supply system and flow regulation valve arrangement. This extraction and relocation eliminates the valve from high-pressure zones during normal operation, significantly reducing pressure losses while maintaining steering control reliability through the alternative connection path via the by-pass line.
2Reliability
If the release and shutoff valve is in closed position when no steering is requested, then load pressure is compensated, but the hydraulic conveyor device must operate against pressure
Solution Approach 1:
A by-pass line with a second valve is introduced as an intermediary element. When the release and shutoff valve is closed to maintain cylinder position, the by-pass line provides an alternative path for hydraulic fluid to return to the tank, allowing the pump to operate at lower pressure while the steering cylinder maintains its position through the closed release and shutoff valve.
3Quantity of substance
If the valves of the flow regulation valve arrangement are optimized for larger through-flow, then oil quantity increases, but pressure losses increase with the traditional valve configuration
Solution Approach 1:
The hydraulic circuit is segmented into multiple paths: the main path through the release and shutoff valve for steering operations, and an alternative path through the by-pass line with the second valve for pressure relief and flow management. This segmentation allows the flow regulation valve arrangement to be optimized for larger through-flow capacity without proportionally increasing pressure losses, as excess flow can be diverted through the by-pass line.
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 configuration reduces pressure losses, maintains the steering cylinder's position, relieves load on the flow regulation valve arrangement, and enables increased oil flow, enhancing steering support and efficiency.
Implementation Method 1
the release and shutoff valve is in the closed position... the load pressure can be compensated
Implementation Method 2
hydraulic steering device... steering cylinder which is hydraulically connected to a supply system
Data Source
AI summary
The invention relates to a hydraulic steering device that hydraulically connects a steering cylinder to a supply system, whereby the supply system is hydraulically operatively connectable to the steering cylinder via a steering valve to form a main flow connection and the supply system is hydraulically operatively connectable to the steering cylinder via a flow regulation valve arrangement to form a branch flow connection that circumvents the main flow connection, whereby the flow regulation valve arrangement is triggerable by an electric control unit and the flow regulation valve arrangement comprises valve groups that are triggerable individually, which are respectively connected in the forward flow and return flow of the branch flow connection and a release-shutoff valve is assigned to the flow regulation valve arrangement. It is provided that the release-shutoff valve is connected between the flow regulation valve arrangement and the steering cylinder.