Red Seal Gasfitter — Class B Practice Exam

Which safety device is commonly used to prevent gas leaks in appliances?

1. Gas filter

2. Gas shut-off valve

3. Pressure regulator

4. Gas analyzer

The correct answer is: Gas shut-off valve

The gas shut-off valve is a critical safety device used in gas appliances to prevent gas leaks. Its primary function is to stop the flow of gas to an appliance when it is turned off or in case of an emergency. This helps to ensure that if there is any kind of malfunction, such as a leak or a failure of the appliance, the gas supply can be quickly and effectively shut off, minimizing the risk of a hazardous situation. The gas shut-off valve is generally located in an accessible place, allowing for swift action in emergencies. It is essential for ensuring the safety of both users and appliances, contributing to overall safety standards in gas installations. By regulating the flow of gas to the appliance, it helps protect against dangerous accumulations of gas that could lead to fires or explosions. In contrast, the other devices listed serves different functions. For instance, a gas filter removes impurities from the gas but does not have a direct role in preventing leaks. A pressure regulator maintains the appropriate pressure of gas entering an appliance, which is crucial for proper operation but does not prevent leaks themselves. Similarly, a gas analyzer is used to gauge the composition of the gas being used or to detect the presence of harmful gases, but it doesn’t prevent leakage directly. Thus,