Hydraulic Cartridge Valve Screen Element Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic valves are not effectively protected against contaminant particles, and their design often results in a longer axial length and increased complexity, making them costly and difficult to produce.
Innovation Solution
A hydraulic valve with axially movable valve piston and slotted holes protected by a metal band screen element, featuring a filter mask with a welding portion and a support band that envelops the valve bushing, allowing for a simple and cost-effective configuration with a short axial length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing hydraulic valve designs are used, then protection against contaminant particles is insufficient, but adding more protective measures increases device complexity and axial length
Solution Approach 1:
The screen element combines the filter mask and support band into a single integrated component. The support band is formed as one piece with the filter mask, eliminating the need for separate protective components and reducing overall device complexity while maintaining effective contaminant protection.
Solution Approach 2:
The screen element is nested within the valve bushing structure, with the support band fitting into a groove of the valve bushing. This nested arrangement allows the protective screen element to be integrated into the existing valve structure without significantly increasing axial length or overall complexity.
2Reliability
If existing hydraulic valve designs are used, then protection against contaminant particles is insufficient, but adding more protective measures increases axial length
Solution Approach 1:
The filter mask is designed as a thin, band-like structure that provides effective filtration across the slotted hole. This thin-film approach allows contaminant protection without requiring thick or extended protective structures, thereby maintaining a compact axial length.
Solution Approach 2:
The screen element transitions from a traditional three-dimensional protective structure to a predominantly two-dimensional band structure that wraps around the slotted hole. This dimensional reduction allows effective protection while minimizing axial length requirements.
3Ease of manufacture
If existing hydraulic valve designs are used, then production is costly and difficult, but simplifying the design may compromise protection effectiveness
Solution Approach 1:
The screen element is segmented into functional zones: the filter mask portion that provides filtration and the support band portion that provides structural support and positioning. This segmentation allows each part to be optimized for its specific function while being manufactured as a single integrated component, simplifying production.
Solution Approach 2:
The support band has varying thickness along its length, with different thickness zones optimized for different functions (filtration support vs. structural support). This parameter variation allows the component to achieve multiple functions with a single manufacturing process, reducing production complexity and cost.
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 provides reliable protection against contaminant particles while maintaining a compact design, facilitating easy assembly and production, and ensuring secure contact between the screen element and valve bushing without gaps for particle entry.
Implementation Method 1
an end portion of the support band at least partially covers the weld portion of the filter mask and is welded together with the weld portion
Implementation Method 2
a support band extends from a second end of the filter mask, wherein the support band is arranged in the second groove and envelops the valve bushing
Implementation Method 3
the screen element is configured as a metal band which covers the slotted hole with a filter portion
Data Source
AI summary
A hydraulic valve, in particular a cartridge valve including a valve piston that is supported axially movable in a valve bushing and by which at least one operating connection, advantageously two operating connections are alternatively connectable with a supply connection and a tank drain, wherein the connections are configured with respect to a longitudinal axis of the valve bushing as slotted holes that extend over a limited distance in a circumferential direction and which are respectively protected by a screen element configured as a metal band which covers the slotted hole with a filter portion, wherein the screen element is arranged in a first groove enveloping the slotted hole and envelops the valve bushing in a second groove originating from the first groove on two sides, characterized in that the screen element includes a filter mask which includes a welding portion at a first end.