Recirculation Valve Filtration for High-Temperature Fouling Control
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Solution Overview
Problem
High temperatures can cause movable parts in overrun air recirculation valves to become fixed, leading to malfunctions due to the ingress of contaminated fluid containing stains, which result in deposits and fouling such as sooting or coking.
Innovation Solution
A separation device is integrated into the valve member or valve seat to separate out stains from the fluid, using mechanisms like labyrinth or cyclonic separation, ensuring that even in the closed state, the fluid is cleansed before entering the valve, preventing contamination and fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve is operated in high temperature conditions, then the valve can control fluid flow effectively, but stains in the fluid cause deposits and fouling that lead to fixation of movable parts and malfunctions
Solution Approach 1:
The separation device is positioned upstream in the fluid path to remove stains and contaminants from the fluid before the fluid reaches the valve member and valve seat. This preliminary cleaning action prevents deposits and fouling from forming on critical valve components, thereby maintaining reliable operation under high temperature conditions without requiring post-contamination cleanup
Solution Approach 2:
The separation device acts as an intermediary component between the contaminated fluid source and the valve mechanism. It separates and removes harmful stains from the fluid, allowing the valve to operate with clean fluid while the contaminated fluid is diverted or treated separately, thus protecting the valve from direct exposure to harmful contaminants
2Object-affected harmful factors
If a separation device is integrated into the valve, then fluid contamination is reduced, but the device complexity increases
Solution Approach 1:
The separation device is integrated directly into the existing valve structure, combining the fluid separation function with the valve body or valve member. This merging of functions eliminates the need for a separate standalone separation unit, reducing overall system complexity while still achieving effective contaminant removal before fluid reaches critical components
Solution Approach 2:
The valve structure is designed to serve multiple functions: it acts as both the fluid control valve and the housing for the separation device. The valve member or valve seat is configured to incorporate separation elements, allowing the same component to perform both flow control and contaminant removal functions simultaneously, thereby avoiding additional complex components
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 separation device effectively prevents contaminated fluid from penetrating into the valve, reducing the risk of sooting or coking and enhancing the failure safety by maintaining the valve's operational integrity even at high temperatures.
Implementation Method 1
using mechanisms like labyrinth or cyclonic separation
Implementation Method 2
a sealing element that is pretensioned by means of a spring element, by means of which the valve member is forced into a predetermined position
Data Source
AI summary
A valve for controlling at least one first flow of at least one fluid, in particular, within a motor vehicle, along a first fluid path from at least one valve inlet to at least one valve outlet, comprising at least one valve seat that is arranged—with regard to the fluid flow—between the valve inlet and the valve outlet, wherein the valve seat can be closed at least in some regions in at least one closed position by means of at least one valve member.