What is the shutoff valve located at the immediate connection of each source to the piped distribution system called?

The term for the shutoff valve located at the immediate connection of each source to the piped distribution system is commonly referred to as a Source Valve. This valve serves a critical function in managing the flow of fluids from the source into the distribution infrastructure. It acts as a gatekeeper, allowing for the control and isolation of the source from the rest of the system. This is particularly important for maintenance and emergency situations, where it may be necessary to stop flow without impacting the entire distribution system.

A Source Valve is typically placed directly at the point where the supply (such as a pipe leading from a water main, reservoir, or well) connects to the piping system, ensuring that operators can quickly access and control the flow from that source as needed. The distinct naming helps differentiate it from other types of valves that may be used further down the line, such as the main valve or control valve, which serve different purposes within the system.