Gas Fitter Practice Test

In a gas system, what is the function of a pressure regulator?

1. To ignite gas safely

2. To increase gas pressure

3. To maintain consistent gas pressure

4. To cut off the gas supply

The correct answer is: To maintain consistent gas pressure

A pressure regulator plays a vital role in a gas system by maintaining a consistent gas pressure. The importance of this function lies in the need for safety and efficiency in gas utilization. Gas appliances are designed to operate effectively at a specific pressure range; any significant deviation can lead to inefficient performance or even hazardous conditions. By regulating pressure, the device ensures that gas is delivered to appliances at a steady level, regardless of changes in the supply pressure or demand. If the pressure fluctuates, it could cause appliances to maloperate, potentially leading to gas leaks or incomplete combustion, which generates harmful emissions. While a pressure regulator does not ignite gas or increase its pressure, it is crucial for converting the variable pressure from the supply line to a safe operating level for household use. Additionally, while some systems use shut-off valves to cut off the gas supply in case of emergencies, the primary purpose of a pressure regulator is to ensure that the gas pressure remains constant and within safe parameters for proper appliance function.