Integrated Filter Valve Assembly for Fuel System 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 featuring a by-pass valve system that automatically opens when the filter medium becomes clogged and a shut-off valve system that prevents fuel leakage during filter replacement, allowing for maintenance without shutting off the fuel system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional 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, complex, and costly
Solution Approach 1:
The bypass valve and shut-off valve are integrated into a single valve assembly that is mounted inside the filter housing, combining multiple functions into one compact unit. This merging of components reduces the overall complexity and size of the bypass system while maintaining the ability to provide continuous fuel supply when the filter medium becomes clogged
Solution Approach 2:
The valve assembly is nested within the filter housing, with the bypass valve and shut-off valve pistons housed inside the same structure. This nesting arrangement allows the bypass system to be compact and integrated, eliminating the need for separate external bypass components and reducing system complexity
2Ease of manufacture
If the filter medium is removed and replaced conventionally, then the filter can be maintained, but the fuel system and engine must be switched off, leading to downtime
Solution Approach 1:
The shut-off valve piston automatically closes the fluid flow path before the filter housing is removed from the manifold. This preliminary action of shutting off the fuel flow in advance allows the filter to be replaced without requiring the engine to be switched off, thereby eliminating downtime while maintaining the ability to perform filter maintenance
3Ease of repair
If the filter housing is removed for filter replacement, then the filter medium can be replaced, but fuel leakage may occur during removal
Solution Approach 1:
The shut-off valve piston closes the fluid flow path from the fluid inlet to the inner chamber before the filter housing is removed. This preliminary shutdown of the fuel flow prevents fuel leakage during the filter replacement process, making maintenance safer and easier while eliminating the harmful effect of fuel spillage
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 lightweight, simple, and reliable bypass system that minimizes downtime and fuel leakage, enabling quick and efficient filter replacement without disrupting the fuel supply, while maintaining system reliability and performance.
Implementation Method 1
in response to a pressure differential across the filter medium exceeding a predetermined value
Implementation Method 2
a by-pass valve spring arranged to move the by-pass valve piston
Implementation Method 3
a shut off valve spring arranged to move the shut off valve piston
Data Source
Figure 1~3
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Figure 6
AI summary
A filter assembly comprising: a manifold (1) having a fluid inlet (2) and a fluid outlet (3), a filter housing (4) having a filter medium (6) provided therein, the filter medium defining an inner filter chamber (7) and defining an outer filter chamber (8) 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; characterised by the filter assembly further comprising a valve assembly mounted inside the manifold, and a by-pass channel (12) defined inside the manifold between the fluid inlet and the fluid outlet, the valve assembly comprising a valve body (200) and a by-pass valve system and a shut off valve system, wherein the by-pass valve system comprises: a by-pass valve piston (10) having a piston body, and a by-pass valve spring (11) arranged to move the by-pass valve piston, in response to a pressure differential across the filter medium exceeding a predetermined value, from an open position to a by-pass position, wherein in the open position, the by-pass valve spring is biased to hold the by-pass valve piston such that the piston body blocks flow through the by-pass channel (12) and a flow path is defined from the fluid inlet to the inner chamber via the piston, and in the by-pass position, the by-pass valve spring is compressed such that the piston body does not cover the by-pass channel, to provide a fluid flow path from the inlet to the outlet via the by-pass channel; and wherein the shut off valve system comprises: a shut off valve piston (100), and a shut off valve spring (16) arranged to move the shut off valve piston, in response to removal of the filter housing from the manifold, from an open position to a shut off position, wherein in the open position, a fluid flow path is defined from the fluid inlet to the inner chamber, and in the shut off position the shut off valve spring moves the shut off valve piston to close the fluid flow path from the fluid inlet to the inner chamber and to close the flow path to the outlet.