Which component on the station inlet is described as providing isolation of the gas supply?

• A. A main vacuum line
• B. A primary valve
• C. A secondary valve
• D. A pressure gauge

Answer: (B)

Isolating the gas supply at the station inlet is done with the primary valve. This valve acts as the main shut-off, allowing you to stop flow from the pipeline into the station for maintenance or safety. The other components don’t provide isolation: the main vacuum line is for suction, not gas shut-off; the pressure gauge only measures pressure; a secondary valve may offer additional downstream isolation, but the primary valve is the component specifically designed to isolate the supply.