Integrated Filter Valve Assembly for Leak-Free Maintenance
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Solution Overview
Problem
Current filter bypass systems are large, complex, and costly, and require engine shutdown for filter replacement, leading to undesirable downtime and potential fuel leakage during maintenance.
Innovation Solution
A compact, integrated valve assembly within the filter manifold that automatically actuates a bypass and shut-off function, using a preloaded piston and Belleville spring to manage fluid flow, ensuring continuous fuel supply and preventing leakage during filter replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bypass system is provided to allow fuel flow when the filter medium is clogged, then the engine can continue to receive fuel, but the bypass system becomes large and complex
Solution Approach 1:
The patent combines the bypass valve and shut-off valve into a single integrated valve assembly housed within the filter housing. This merging of functions reduces the overall complexity and size of the bypass system while maintaining the reliability of continuous fuel supply to the engine.
Solution Approach 2:
The valve assembly performs multiple functions: it acts as a bypass valve to allow fuel flow around the filter medium when clogged, and simultaneously functions as a shut-off valve to stop fuel flow during filter replacement. This multi-functionality eliminates the need for separate bypass and shut-off systems, reducing complexity.
2Ease of repair
If the filter medium is removed and replaced conventionally, then the filter can be maintained, but the fuel system must be switched off leading to downtime
Solution Approach 1:
The shut-off valve automatically activates before the filter medium needs to be replaced, shutting off fuel flow to the filter housing in advance. This preliminary action allows the filter to be removed and replaced without requiring the entire fuel system to be switched off, minimizing engine downtime.
Solution Approach 2:
The valve assembly is automatically actuated by the filter housing itself during removal. As the filter housing is detached from the manifold, the valve piston is automatically moved to the shut-off position, eliminating the need for manual intervention or engine shutdown.
3Ease of repair
If the filter housing is detached from the manifold, then the filter can be replaced, but fuel leakage may occur during removal
Solution Approach 1:
The shut-off valve automatically activates before the filter housing is fully detached, shutting off fuel flow in advance. This preliminary action prevents fuel leakage during the removal process by ensuring the fuel supply to the filter housing is cut off before disconnection occurs.
Solution Approach 2:
The valve piston acts as an intermediary mechanism between the filter housing and the fuel supply system. It automatically moves to the shut-off position as the filter housing is detached, mediating the transition and preventing fuel leakage during the removal process.
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 a reliable, lightweight, and cost-effective bypass system that maintains engine operation during filter clogging and allows for quick, leak-free filter replacement without shutting down the fuel system, reducing maintenance time and costs.
Implementation Method 1
a disk spring positioned across the bypass channel such that, in its default state, the disk spring extends across the bypass channel to prevent flow from the fluid inlet to the fluid outlet via the bypass channel and wherein, when the pressure differential across the disk spring exceeds a predetermined threshold, the disk spring deforms to open the bypass channel
Implementation Method 2
the valve assembly comprising a shut off valve piston and a shut off valve spring arranged in engagement with the valve piston to bias the valve piston into a first position
Data Source
AI summary
A filter assembly includes a manifold having a fluid inlet and a fluid outlet, a filter housing having a filter medium provided therein. The filter medium defines an inner filter chamber and defining an outer filter chamber between the filter medium and the filter housing, the filter housing being removably attached to the manifold so as to provide a fluid flow path from the inlet into the inner filter chamber, through the filter medium into the outer chamber and out of the outlet. The filter assembly also has a valve assembly mounted inside the manifold. The valve assembly also includes a shut off valve piston and a shut off valve spring arranged in engagement with the valve piston to bias the valve piston into a first position and an adaptor ring located between the shut off valve piston and the filter housing and provided with an annular outlet seal.