Gas Shut-Down Valve Leak Testing System
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Solution Overview
Problem
Existing methods for testing gas shut-down valves in combustion engines are inadequate for detecting small leaks, which can lead to explosions, as they do not effectively assess the sealing ring's integrity during operation.
Innovation Solution
A specialized system with a holder chamber that divides into two portions, using non-burnable pressurized gas to test for leaks at the valve seat and sealing ring, with control oil to open the valve and sealing oil to prevent test gas entry, and a gas discharge tube to detect escaped gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing testing methods are used, then the testing process is simple, but small leaks at the valve seat and sealing ring cannot be detected
Solution Approach 1:
The holder chamber is divided into two separate portions: a first portion containing the valve body and a second portion containing the sealing ring. This segmentation allows independent pressurization of each chamber, enabling precise detection of leaks at different locations (valve seat vs. sealing ring) and improving measurement precision without overwhelming system complexity
Solution Approach 2:
A non-burnable test gas is introduced as an intermediary substance to detect leaks. The gas is supplied to the second portion at high pressure (about 300 bar), and any leakage through the sealing ring or valve seat can be detected by monitoring gas escape, providing sensitive leak detection while maintaining safety
2Measurement precision
If high pressure test gas is supplied to detect small leaks, then leakage detection sensitivity improves, but the risk of gas entering the valve and causing explosion increases
Solution Approach 1:
A non-burnable test gas is used instead of flammable gas to create an inert testing environment. This allows high-pressure gas (about 300 bar) to be supplied to the second portion for sensitive leak detection without creating explosion risks, as the gas cannot combust even if it enters the valve or contacts fuel
Solution Approach 2:
The chamber segmentation isolates the high-pressure test gas to the second portion, separating it from the valve interior (first portion) through the sealing ring. This physical separation allows high-pressure gas supply for sensitive detection while preventing gas entry into the valve that could cause explosions
3Reliability
If the valve is tested in closed condition with pressurized gas, then the valve seat closure can be checked, but the sealing ring integrity during operation cannot be assessed
Solution Approach 1:
The testing system dynamically simulates operational conditions by supplying sealing oil to the sealing ring at pressures higher than the test gas pressure, mimicking the valve's sealed state during operation. This dynamic pressurization from multiple directions allows assessment of sealing ring integrity under conditions corresponding to actual valve operation, enhancing both reliability verification and operational adaptability
Solution Approach 2:
The holder chamber design provides multi-functionality: it can test both the valve seat closure (by pressurizing the first portion) and the sealing ring integrity (by pressurizing the second portion), assessing multiple aspects of valve performance in a single integrated system, thereby improving both reliability verification and operational condition simulation capability
Data Source
Figure 1
Figure 2~3b
Figure 4~5
AI summary
Method of testing a gas shut-down valve for a combustion engine, by which method the valve is placed in a chamber of a holder 1 and the valve in closed condition is influenced by a non-burnable test gas under pressure to check whether the valve seat and the sealing ring 6 of the valve are close. Further the opening and closing functions of the valve are to be checked.