HVAC Journeyman Practice Exam

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The pressure regulator in a gas piping system is primarily used for what purpose?

To increase gas pressure
To measure gas flow
To maintain consistent gas pressure
To shut off gas supply

The correct answer is: To maintain consistent gas pressure

The primary purpose of a pressure regulator in a gas piping system is to maintain consistent gas pressure. A pressure regulator works by reducing the high inlet pressure of gas supplied from the source to a lower, stable outlet pressure suitable for appliances and equipment. This consistent pressure ensures that gas appliances operate efficiently and safely, preventing fluctuations that could lead to inadequate performance or safety hazards. For instance, without a regulator, variations in incoming gas pressure could cause appliances to either receive too much gas, resulting in erratic operation, or too little gas, leading to inefficient combustion and potential shutdowns. Therefore, the ability of a pressure regulator to maintain a constant outlet pressure is crucial for the proper functioning of gas appliances and the overall safety of the gas piping system.