At what temperature does the valve of a cycling sprinkler open to allow water flow?

The valve of a cycling sprinkler is designed to open at a certain temperature to enable water flow in response to a fire. The standard temperature for many types of these sprinklers is often set at 165° F. This temperature is chosen because it balances the need to activate the system promptly in the event of a fire while minimizing unnecessary activations due to heat fluctuations or minor incidents.

When the ambient temperature around the sprinkler reaches 165° F, the glass bulb or fusible link in the sprinkler head will break, triggering the flow of water. This ensures that the fire suppression system activates effectively to help control or extinguish a fire. Knowing this temperature is crucial for safety planning and ensuring that fire systems operate correctly when needed.