Servovalve Venting Passage With Multi-Plane Labyrinth Paths
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Solution Overview
Problem
Hydraulic valves, such as servovalves, face challenges in venting passages that allow contaminants like dust and sand to enter the valve when exposed to severe environments, while also needing to manage pressure differentials and condensation effectively.
Innovation Solution
The hydraulic valve incorporates a venting passage with labyrinth paths extending over two planes at an angle, preventing contaminants from entering while allowing gas and condensation to escape, and equalizing pressure differentials by extending between the body and cover, with the labyrinth paths featuring multiple bends and directions to obstruct entry of contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a venting passage is provided to allow condensation and gas to escape, then pressure equalization and condensation release are improved, but contaminants such as dust and sand can enter the valve interior
Solution Approach 1:
The venting passage transitions from a single-plane straight path to a multi-plane labyrinth path with bends and direction changes. This dimensional complexity in the passage layout creates a protective effect while maintaining venting functionality, allowing pressure equalization without direct contaminant access to the interior.
Solution Approach 2:
The venting passage is divided into multiple segments with bends and direction changes rather than a single continuous straight path. This segmentation creates multiple obstacles that contaminants must navigate, effectively filtering out particles while allowing gas and condensation to pass through the complex path to the exterior.
2Ease of manufacture
If a straight venting passage is used, then manufacturing simplicity is improved, but contaminants can easily enter the valve interior
Solution Approach 1:
The venting passage is designed to extend over two planes with angular relationships (e.g., approximately 90 degrees) between them, creating a labyrinth path that is more resistant to contaminant ingress while remaining manufacturable through standard machining or molding processes.
3Object-affected harmful factors
If a labyrinth path with multiple bends is implemented, then contaminant entry is prevented, but passage length and structural complexity increase
Solution Approach 1:
The labyrinth path achieves contaminant protection by utilizing multiple planes and angular bends rather than simply extending the passage length in a single plane. This approach provides effective contamination prevention while controlling the overall structural complexity through efficient use of three-dimensional space.
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 effectively prevents contamination and allows for pressure equalization and condensation release, ensuring the valve remains clean and functional in harsh environments.
Implementation Method 1
the first and/or second path is a labyrinth path in its respective plane... which may prevent or inhibit contaminants from entering the valve
Implementation Method 2
It may also allow any pressure differential between the interior and exterior of the hydraulic valve, such as a pressure differential created by taking the hydraulic valve to altitude, to equalise
Implementation Method 3
Venting passages are used, for example in hydraulic valves such as servovalves, to allow condensed water or other liquid, such as that formed by vapour condensation, to exit the valve
Data Source
AI summary
A hydraulic valve is disclosed comprising a venting passage for allowing fluidic communication between an interior and an exterior of the hydraulic valve, the venting passage having a first portion following a first path extending in a first plane, and a second portion following a second path extending in a second plane, wherein the first plane is at an angle to the second plane, and wherein the first and/or second path is a labyrinth path in its respective plane.