Fuel Filter Module Service Valve Assembly for Common Drain
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Solution Overview
Problem
Existing fuel systems face challenges in effectively limiting debris in fuel flow while maintaining efficient serviceability, particularly in diesel engine fuel systems, where high pressure and rapid pressure changes complicate the filtration process.
Innovation Solution
A fuel filter module with a primary and secondary filter, a module housing, and a service valve assembly that allows adjustable connection between the primary and secondary filter passages, enabling efficient drainage and filter replacement without interrupting fuel flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple filters and pumps are employed to limit debris in fuel flow, then debris removal effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple filters (primary and secondary) and drainage functions into a single integrated filter module housing. This merging approach maintains effective debris removal through multi-stage filtration while reducing overall system complexity by consolidating components that would otherwise require separate housings and mounting arrangements.
Solution Approach 2:
The filter module housing serves multiple functions simultaneously: it houses both primary and secondary filters, provides common drainage for both filters through shared passages, and includes integrated service valve assemblies. This multi-functionality reduces the need for separate components and simplifies the overall fuel filtration system.
2Reliability
If traditional filtration systems are used, then debris limitation is achieved, but serviceability efficiency deteriorates
Solution Approach 1:
The filter module is designed as a separable unit that can be removed from the fuel system as a complete assembly. The service valve assemblies are positioned to allow individual filter replacement without removing the entire housing, enabling segmented maintenance that improves serviceability while maintaining effective debris limitation through the dual-filter design.
Solution Approach 2:
The service valve assemblies are pre-positioned within the housing to provide direct access to both filters. This preliminary arrangement of service access points allows maintenance personnel to quickly service filters without disassembling the housing or routing complex service lines, thereby improving serviceability efficiency while maintaining the dual-filter debris limitation capability.
3Ease of repair
If filters are serviced traditionally, then filter replacement is possible, but fuel flow interruption occurs
Solution Approach 1:
The service valve assemblies are designed to be dynamically controllable, allowing operators to isolate individual filters for service while maintaining fuel flow through the other filter. This dynamic valve control enables filter replacement operations without complete fuel flow interruption, improving productivity during maintenance while maintaining filter replacement capability.
Solution Approach 2:
The cross passages and service valve assemblies act as intermediaries that allow selective isolation of filter elements during maintenance. These intermediary components enable the servicing of individual filters while maintaining continuous fuel flow through alternative pathways, thereby allowing filter replacement without complete fuel flow interruption.
4Ease of repair
If separate filter housings are used, then serviceability is simplified, but device complexity increases
Solution Approach 1:
The patent merges multiple filter housing functions into a single integrated housing structure that accommodates both primary and secondary filters. This consolidation reduces the number of separate housings and mounting locations required, simplifying the overall device while maintaining serviceability through strategically positioned service valve assemblies that provide access to both filters within the unified housing.
Data Source
AI summary
A filter module for filtering fuel in an engine system includes a primary filter, a secondary filter, and a module housing. A drain valve is movable between a closed position blocking a drain port in the module housing, and an open position. A service valve assembly is positioned at least partially within a cross passage in the module housing and adjustable from a closed configuration blocking a primary-side fuel passage from a secondary-side fuel passage in the module housing, to an open configuration, to drain fluids from the filter module by way of the single drain port.