What is the name of the safety switch in the chilled water line activated by water flow?

The safety switch in the chilled water line that is activated by water flow is known as a flow switch. Its primary function is to detect whether the water is flowing through the system as intended. When water flow is present, the flow switch remains closed, allowing the system to operate normally. If the flow stops or drops below a certain threshold, the flow switch opens, triggering an alarm or shutting down the system to prevent potential damage caused by low flow conditions. This is crucial for protecting equipment like chillers or cooling coils that could be susceptible to overheating or failure without proper water flow.

In contrast, the other options relate to different functions. Pressure switches monitor the pressure within a system, triggering actions if pressure goes above or below set limits. Temperature switches react to changes in temperature and may shut off systems when temperatures exceed or fall below specific thresholds. Cut-off switches are more general and may refer to any switch that can terminate operation due to various parameters, but they are not specific to water flow conditions like flow switches are. Thus, flow switches are specifically designed and utilized in chilled water systems to ensure proper and safe operation based on water flow.