What is a Wet System Composed of?
3 Answers
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.
I've been driving for over 20 years and frequently handle wet dual-clutch transmission systems. This thing has quite a sophisticated composition: at its core is the clutch assembly, featuring multiple metal friction plates immersed in oil, which lubricates, cools, and prevents slipping; then there's the hydraulic control system, including oil pumps, pipelines, and valve bodies, precisely regulating clutch operation; a cooling system is essential, like oil coolers or fans, to maintain stable oil temperature; the electronic control unit processes sensor signals for intelligent gear shifting; and there are seals to prevent oil leaks. The entire structure ensures fast and smooth shifting, making it much more durable than dry types when driving at high speeds, with less risk of overheating. Regular oil changes are crucial, as dirty oil can clog pipelines and affect performance.
When repairing cars, I often encounter wet system failures, which consist of a clutch plate set soaked in oil, a hydraulic drive module, an oil cooling device, and a control module. The clutch plates reduce wear through oil lubrication; the hydraulic part uses pumped oil pressure to control engagement and disengagement; the oil cooler dissipates heat to prevent high-temperature damage; and the ECU integrates data processing to optimize operations. This design is suitable for frequent gear-shifting scenarios, such as in traffic jams where I test-drove it with quick response and low noise. Maintenance focuses on checking oil levels and cleaning the filter screen to avoid clogging.
