Fuel Valve Assembly Vent Passage Check Valve
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Solution Overview
Problem
The operation of locomotive engines using pressurized gaseous fuel is hindered by fuel leakage into pneumatic systems, causing non-functional components and affecting engine operation.
Innovation Solution
A valve assembly with a vent passage and check valve configuration that selectively vents leaked fuel, preventing it from entering the pneumatic chamber and ensuring efficient fuel flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pneumatic system is used to displace the valve element, then the valve assembly can control fuel flow effectively, but fuel may leak into the pneumatic chamber and render components non-functional
Solution Approach 1:
The valve assembly is divided into separate functional zones: a fuel passage section and a pneumatic chamber section. The vent passage creates an intermediate drainage zone that segments the potential leak path, preventing direct communication between the fuel flow path and the pneumatic chamber. This segmentation isolates the harmful effect (fuel leakage) to a controlled vent area rather than allowing it to affect the entire pneumatic system.
Solution Approach 2:
The vent passage acts as an intermediary element between the fuel flow path and the pneumatic chamber. It provides a designated intermediate pathway that captures leaked fuel through the check valve mechanism, serving as a buffer zone that prevents direct contamination of the pneumatic chamber. This intermediary structure mediates the potential harmful interaction between fuel and pneumatic components.
2Reliability
If the vent passage is positioned upstream of the pneumatic chamber, then leaked fuel can be captured before entering the chamber, but the device complexity increases
Solution Approach 1:
The vent passage is integrated directly into the valve body structure, merging the venting function with the existing fuel flow path geometry. The check valve mechanism is incorporated within the same assembly, combining multiple functions (flow control, leakage capture, and venting) into a single integrated component rather than adding separate external systems. This merging approach minimizes additional complexity while achieving the reliability goal.
Solution Approach 2:
The valve assembly structure serves multiple functions: it controls the main fuel flow through the valve element, provides a vent passage for captured leakage, and incorporates a check valve mechanism all within a single integrated body. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while maintaining effective leakage prevention.
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 effectively prevents fuel leakage into pneumatic systems, maintaining operational efficiency and ensuring reliable engine performance by directing leaked fuel away from critical components.
Implementation Method 1
a check valve disposed in the vent passage and configured to selectively vent the fuel entering the vent passage
Implementation Method 2
a first piston slidably disposed in the first bore and configured to reciprocate between a first position and a second position
Data Source
AI summary
A valve assembly of a fuel supply system includes a first body defining a first bore, an inlet port to receive fuel into the first bore, and an outlet port. The valve assembly further includes a pneumatic chamber disposed in fluid communication with the first bore. The valve assembly further includes a first piston to move between a first position and a second position. The first piston restricts and allows flow of fuel from the inlet port to the outlet port, in the first position and the second position, respectively. The valve assembly further includes a vent passage located upstream of the pneumatic chamber and configured to receive fuel leaked from a flow path defined between the inlet port and the outlet port. The valve assembly also includes a check valve disposed in the vent passage and configured to selectively vent the fuel entering the vent passage.