Which type of valve is used to supply gas to the pilot gas pressure regulator?

The correct response identifies the shutoff valve as the type of valve used to supply gas to the pilot gas pressure regulator. A shutoff valve is designed to interrupt the flow of gas within a system, ensuring that when maintenance is required or when starting and stopping operations, the gas supply can be safely controlled. This is critical for safety and operational integrity within a steam system where precise control of gas flow to the regulator is necessary.

The pilot gas pressure regulator is typically responsible for controlling the pressure of the gas that feeds into the main burner, and for this to function correctly, a shutoff valve must be present. It acts as a gate, allowing or preventing the flow of gas based on its current operational demands, which is crucial in maintaining the pre-set conditions for the safe operation of the entire system.