Liquid Fuel Valve Leak Detection via Pneumatic Pressure Testing
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Solution Overview
Problem
Current valve monitoring systems for liquid fuels, particularly heating oil, are inadequate due to the technically demanding nature of incompressible liquids under high pressure, lacking a suitable method for leak detection and evaluation, unlike gas systems which handle quasi-ideal, single-phase substances.
Innovation Solution
A shut-off device testing device that automatically checks the tightness of liquid fuel valves by creating a defined measuring chamber in the liquid passage, applying a test pressure lower than the fuel pressure, and using a pressure detection device to evaluate pressure changes, with a small measuring volume to minimize temperature and inhomogeneity influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve monitoring system for liquid fuels is implemented, then safety standards can be maintained, but the system becomes technically demanding due to incompressible liquids under high pressure
Solution Approach 1:
The patent applies pneumatic principles by using a pressure generator to introduce test gas into a measuring chamber formed in the liquid fuel line. This allows leak detection in liquid fuel systems using gas pressure methods, bridging the technical gap between gas and liquid fuel monitoring while maintaining safety standards.
Solution Approach 2:
The patent introduces a measuring chamber as an intermediary component between the liquid fuel line and the pressure detection system. This chamber allows indirect measurement of leaks by monitoring pressure changes of test gas, simplifying the direct interaction between liquid fuel and sensing mechanisms.
2Reliability
If a pressure difference is applied to seal a valve disk in liquid fuel systems, then valve sealing is achieved, but leak detection becomes difficult due to inhomogeneous substance behavior
Solution Approach 1:
The patent segments the fuel line into a defined measuring chamber between two shut-off devices, isolating a specific volume for leak testing. This segmentation allows precise pressure monitoring in a controlled space, improving measurement precision despite the inhomogeneous nature of liquid fuels with dissolved or undissolved air.
Solution Approach 2:
The patent changes the physical parameter being measured from liquid flow to gas pressure. By introducing test gas into the measuring chamber and monitoring pressure changes, the system achieves reliable leak detection that is not affected by the inhomogeneous compressibility of liquid fuels.
3Measurement precision
If a large measuring volume is used for leak detection, then pressure changes are more detectable, but temperature and inhomogeneity influences increase
Solution Approach 1:
The patent uses a small, partial measuring volume (less than 100 ml) rather than a large volume. This limited volume minimizes the influence of temperature changes and inhomogeneities while still providing sufficient pressure change detection capability for leak monitoring, achieving the right balance between sensitivity and reliability.
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
Enables precise and safe leak detection for liquid fuel valves, maintaining safety standards comparable to those for gaseous fuels, ensuring accurate valve monitoring and preventing leaks in oil combustion systems.
Implementation Method 1
a pressure generating device (150) which is connected to the measuring chamber (54) for acting on the pressure in the measuring chamber (54) with a test pressure
Implementation Method 2
a pressure detection device (43) for detecting a pressure change in the measuring chamber (54)
Data Source
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AI summary
The invention relates to a shut-off device inspection unit (40), which is preferably automatic, for checking the sealing of a shut-off device (32) for liquid fuels, wherein the shut-off device (32) preferably automatically closes or opens a liquid conduit (52) between a first region and a second region of a liquid fuel line for the liquid fuel to which a fuel pressure is applied. The shut-off device inspection unit (40) comprises: a metering chamber (54) which is defined in the liquid conduit (52) between the shut-off device (32) and a preferably automatic closing device (56) and can be separated from the first region by closing the shut-off device (32) and from the second region by closing the closing device (56), a pressure generating device (150) which is connected to the metering chamber (54) for acting on fluid located in the metering chamber (54) with a test pressure which is lower than the fuel pressure, and a pressure sensing device for sensing a pressure change in the metering chamber (54). The invention further relates to uses of such shut-off device inspection units.