Gas Fitter Practice Test

A pressure regulator is a device that:

1. Measures gas flow

2. Reduces gas pressure from inlet to outlet

3. Increases gas pressure from inlet to outlet

4. Maintains a minimum outlet pressure

The correct answer is: Reduces gas pressure from inlet to outlet

The role of a pressure regulator is to reduce gas pressure from the inlet to the outlet and to ensure that the downstream system receives a stable, consistent pressure. When gas is supplied at a higher pressure from a source, the regulator adjusts this pressure to a lower, predetermined level suitable for the appliances or systems using the gas. This function is crucial for safety and efficiency, as many gas appliances and equipment are designed to operate at specific pressure levels. By controlling and reducing high pressure to a usable level, the regulator protects both the equipment and the users from potential hazards associated with excessive pressure. While measuring gas flow and maintaining a minimum outlet pressure are important tasks in the context of gas supply systems, they are not the primary purpose of a pressure regulator. Some devices may potentially incorporate features to monitor flow or pressure, but their main operation focuses on reducing the pressure. Similarly, increasing gas pressure is outside the scope of what a pressure regulator is designed to do.