What is the primary purpose of a gas regulator in a fuel gas system?

The primary purpose of a gas regulator in a fuel gas system is to control and reduce the pressure of the gas delivered to the appliances. Regulators are essential components that ensure the gas is delivered at a safe and usable pressure, preventing damage to appliances and ensuring their efficient operation. By lowering the inlet pressure to a consistent and appropriate level, the regulator helps maintain a stable supply of gas, allowing appliances to operate effectively and safely.

The design of a gas regulator enables it to continuously monitor the downstream pressure and make adjustments as needed to accommodate changes in demand while keeping the pressure within specified limits. This function helps prevent fluctuations that could lead to unsafe conditions or inefficient combustion. Thus, the gas regulator plays a crucial role in maintaining the proper functioning of any fuel gas system, making choice B the correct answer.