G2 Gas Fitter Practice Exam

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Prepare for the G2 Gas Fitter Test. Study using flashcards and multiple choice questions, with hints and detailed explanations for each question. Ensure your success!

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Which valve stops the supply of gas when de-energized by a safety control?

Fast closing valve
Safety shut-off valve
Zero governor
Control valve

The correct answer is: Safety shut-off valve

The safety shut-off valve is specifically designed to stop the flow of gas when prompted by a safety control de-energization. This design enables it to act quickly in situations where there's a malfunction or unsafe condition, thereby preventing potential hazards such as leaks or explosions. Safety shut-off valves are integral to gas systems, ensuring that if an safety control device detects an unsafe condition, the gas supply can be effectively halted to mitigate risks. This is in contrast to the other options; for instance, a fast-closing valve, while it may close quickly, does not specifically serve the function of a safety control mechanism. A zero governor regulates pressure but does not stop gas flow entirely, and a control valve typically modulates the flow based on demand rather than providing a shutdown function in response to safety measures. Thus, the safety shut-off valve is critical for immediate response to hazardous situations, making it the correct choice.