What is the name of the valve located at the point of entry (POE)?

The valve located at the point of entry (POE) is commonly referred to as the main service valve. This valve is crucial because it serves as the primary control point for the gas supply entering a residential or commercial building. It allows for the gas supply to be shut off completely during maintenance, emergencies, or inspections.

In the context of the choices provided, understanding the specific roles of each type of valve helps clarify why the main service valve is the appropriate term. The meter shut-off valve, for instance, is located near the gas meter and is typically used to shut off the gas supply to the meter itself rather than at the entry point to the property. Similarly, an isolation valve is used within the piping system to isolate sections of the gas line for repairs but is not specifically at the point of entry. The head service valve does not represent a widely recognized term in the context of gas piping, further emphasizing the main service valve's relevance at the POE.

Recognizing the primary function and placement of the main service valve reinforces its critical role in gas safety management at the entry point of gas systems.