Integral Pressure Limiting Valve for Common Rail Reservoirs
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Solution Overview
Problem
High pressure reservoirs in direct fuel injection systems, such as common rails, require pressure limiting valves that are complex and costly due to standalone mechanical designs, with adjustment challenges leading to production inefficiencies and rejected valves.
Innovation Solution
An integral pressure limiting valve arrangement where the housing is part of the reservoir wall, with a spring-biased closing member sealing an overpressure relief orifice, allowing adjustable pressure threshold settings and reduced sealing areas, enhancing material efficiency and adjustability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standalone pressure limiting valve is used, then the valve can be individually adjusted and checked, but the design complexity and manufacturing cost increase due to complementary geometries required on both the rail and valve
Solution Approach 1:
The valve housing is integrated directly into the common rail structure, eliminating the need for separate standalone valve assemblies. The closing member moves within a cavity formed in the rail wall itself, and the biasing spring is contained within the same structural element, merging what were previously separate components into a unified design that reduces complexity while maintaining adjustability
2Adaptability or versatility
If a standalone pressure limiting valve is used, then the valve can be individually adjusted, but the manufacturing cost increases due to additional sealing areas and complementary geometries
Solution Approach 1:
By integrating the valve housing into the common rail, the number of separate sealing interfaces is reduced. The closing member seals against a valve seat formed within the rail cavity, eliminating the need for additional sealing between separate valve and rail components. This integration reduces manufacturing steps and material requirements
3Manufacturing precision
If the valve housing is fixedly arranged on the rail, then the pressure threshold can be set, but the technical complexity and associated cost increase
Solution Approach 1:
The closing member is designed to be movable within the integrated housing, allowing dynamic adjustment of the pressure threshold by varying the spring preload or closing member position. This dynamic capability is achieved within the integrated structure without requiring complex external adjustment mechanisms, maintaining precision while reducing overall system complexity
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
This solution simplifies the design, reduces material costs, and allows for individual pressure threshold adjustments, improving manufacturing efficiency and reducing rejected valves by integrating the valve housing with the reservoir wall and enabling adjustable pressure settings.
Implementation Method 1
a closing member, permanently biased by a spring toward a closed position
Implementation Method 2
When the pressure in the reservoir exceeds the predetermined threshold the closing member is pushed by the high pressure fluid away from the valve seat
Data Source
AI summary
A high pressure container arrangement includes a reservoir having an outer wall and an over pressure relief orifice through which high pressure fluid may flow when the fluid pressure inside the reservoir exceeds a predetermined pressure threshold. The high pressure container arrangement also includes a pressure limiting valve having a housing in which is arranged a closing member permanently biased by a spring toward a closed position and, when the pressure in the reservoir exceeds the predetermined threshold the closing member is pushed in an open position. The housing of the pressure limiting valve is integral to the wall of the reservoir.