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What is a Wet System Composed of?

1 Answers

VonMatteo

07/29/25 4:16pm

Wet system consists of wet alarm valve assembly, closed sprinkler heads, water flow indicators, control valves, end water test devices, piping, and water supply facilities. Working principle of wet system: When a fire occurs, the ambient temperature around the fire source continues to rise. When the ambient temperature reaches the activation temperature of the closed sprinkler head, the thermal element of the sprinkler head activates, causing the sprinkler to open and discharge water to extinguish the fire. As water flows through the pipeline, the water pressure on one side (system side) of the pipe network decreases, causing the wet alarm valve disc to open due to the pressure difference between the upper and lower sides, supplying water to the system for firefighting. The water flow indicator installed in the main pipe of the affected area activates due to water flow, converting the water flow signal into an electrical signal. Upon receiving the electrical signal from the water flow indicator, the alarm control panel emits audible and visual alarm signals, indicating the fire-affected area. Simultaneously, the wet alarm valve opens, allowing a portion of water to flow into the alarm pipeline. After a delay of 5-90 seconds through the retarder, the water flow impacts the hydraulic mechanism, causing the alarm bell to sound. The rising pressure at the alarm port activates the pressure switch, which directly sends an electrical signal to the fire pump control cabinet to start the fire pump for pressurizing and supplying water, while also transmitting the signal to the fire control center, achieving the purpose of continuous automatic sprinkler fire extinguishing.

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