G2 Gas Fitter Practice Exam

What is the term for an automatic valve that closes in less than 5 seconds when de-energized?

1. Fast closing valve

2. Safety shut-off valve

3. Zero governor

4. Vent connector

The correct answer is: Fast closing valve

The term for an automatic valve that closes in less than 5 seconds when de-energized is known as a fast closing valve. This type of valve is designed to rapidly shut off the flow of gas in response to an emergency situation or a loss of power, helping to ensure safety within gas systems. Fast closing valves are particularly important in maintaining safety standards, as they minimize the risk of gas leaks or other potentially hazardous situations by quickly stopping the flow of gas. The ability to close within a specific time frame, such as less than 5 seconds, is a critical feature of these valves, making them essential for emergency shut-off applications. The other terms in the question refer to different components or systems related to gas fitting but do not specifically describe a valve that meets the criteria stated. For instance, a safety shut-off valve is a more general term that can refer to different types of valves used for safety purposes, not specifically limited to the fast closing characteristics. A zero governor relates to pressure control in gas systems, while a vent connector is an element involved in venting gases away from appliances and does not pertain directly to the functionality described. Such distinctions are important for understanding the specific application and efficacy of the components involved in gas fitting systems.