Valve Leak Detection Using Movable Gas Sensor
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Solution Overview
Problem
Conventional pressure-resistance inspection methods for valves, such as the water bubble leak method, sniffer method, and vacuum chamber method, are prone to errors, require skilled operation, and are inefficient due to the need for post-treatment and complex setups, especially when dealing with valves of different sizes and shapes.
Innovation Solution
A pressure-resistance inspection apparatus with a movable gas sensor, capable of detecting external hydrogen leaks, is used to isolate the test valve and move the sensor close to the outer surface for accurate detection, eliminating the need for post-treatment and allowing automation and mass processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If water bubble leak method is used, then leak detection can be performed, but inspection requires skilled operation and post-treatment is needed
Solution Approach 1:
The patent replaces the mechanical/visual inspection method (water bubble leak method requiring visual checking of air bubbles) with an automated sensor-based detection system. The sensor automatically detects leaked gas and sends signals to a control unit, eliminating the need for skilled visual inspection and post-treatment operations.
Solution Approach 2:
The inspection system performs self-service by automatically detecting leaks through the sensor and control unit without requiring operator intervention for bubble observation or post-treatment. The system autonomously completes the inspection process, removing the burden of skilled operation and post-treatment steps.
2Measurement precision
If sniffer method is used, then leak detection is possible, but inspection time increases and probe operation requires skill
Solution Approach 1:
The patent replaces the manual probe-based sniffer method with an automated sensor system positioned within the cover. The sensor automatically detects leaked gas without requiring manual probe movement, significantly reducing inspection time and eliminating the need for skilled probe operation.
Solution Approach 2:
The sensor is pre-positioned within the cover structure, ready to detect leaks as soon as the test piece is placed inside. This preliminary positioning eliminates the time required for manual probe movement and positioning during inspection, enabling immediate detection upon placement.
3Measurement precision
If vacuum chamber method is used, then leak detection can be performed, but inspection efficiency decreases due to vacuum setup time
Solution Approach 1:
The patent replaces the complex vacuum chamber system with a simple sensor-based detection method. The sensor directly detects leaked gas in atmospheric conditions, eliminating the time-consuming vacuum setup and teardown processes while maintaining leak detection capability.
Solution Approach 2:
The patent extracts the essential leak detection function from the complex vacuum chamber system, isolating only the necessary sensing capability. This extraction removes the unnecessary vacuum setup time and other complex operations, improving inspection efficiency while preserving the core leak detection function.
4Measurement precision
If sensor wall completely covers container, then leak detection sensitivity improves, but gas flow is hindered and leak sensing fails
Solution Approach 1:
The patent applies local quality by positioning the sensor to face specific high-probability leak areas rather than attempting complete 360-degree coverage. The sensor is strategically oriented toward flange parts and joint portions where leaks most commonly occur, maintaining detection sensitivity while allowing gas flow from other directions.
Solution Approach 2:
Instead of having the sensor wall completely surround the container (which blocks gas flow), the patent inverts the approach by using an open cover structure with the sensor positioned to detect gas as it naturally flows outward from leak points. This inverted configuration eliminates gas flow obstruction while maintaining detection capability.
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 apparatus enables quick and accurate detection of external leaks and their positions on valves of varying sizes and shapes, preventing errors and facilitating automation, while avoiding the complexities of traditional methods.
Implementation Method 1
the sensor is a gas sensor movable to a retention region of the search gas externally leaked from the test valve
Data Source
AI summary
Provided are a pressure-resistance inspection apparatus for valves and its inspection method, and hydrogen gas detection unit capable of detecting external leakage and specifying its position of occurrence even for valves with different sizes and shapes by performing pressure-resistance inspection with a simple structure quickly with high accuracy while preventing errors in test results, without requiring post-treatment for the valves, and also capable of mass processing by automation. Provided are a cover 2 in which a test valve 1 is accommodated in a state of being isolated from outside and a sensor 22 inside this cover 2 and capable of moving to a position close to an outer surface of the test valve 1 filled with a search gas. This sensor 22 is a gas sensor capable of detecting external leakage of the search gas from the test valve 1.