Application of fire alarm valve in buildings

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The alarm valve is used in buildings. The alarm valve is a device that automatically sprays water to extinguish the low speed external fire system, connects or cuts off the water source, and starts the alarm. In the automatic sprinkler system, the alarm valve is a vital component, which has three functions: connecting or cutting off the water source, outputting the alarm signal and preventing the water flow from returning to the water supply source, and the water supply device and alarm device of the system can be inspected through the alarm valve. The alarm valve is divided into wet alarm valve, dry alarm valve and deluge valve according to different systems

1. Wet alarm valve is used for wet sprinkler system. Its main function is: when the nozzle is opened, the wet valve can automatically open, and make the water flow into the hydraulic alarm bell to send an alarm signal

2. Dry alarm valve is used for dry sprinkler system. Its valve disc divides the valve into two parts. The outlet side is connected with the system pipeline and nozzle, filled with compressed air, and the inlet side is connected with the water source. The dry-type valve uses the torque difference between the air pressure and water pressure on both sides on the valve disc to control the closure and opening of the valve disc. Generally, it can be divided into differential dry alarm valve and closed dry alarm valve

3. Deluge valve is used for deluge sprinkler system, pre action sprinkler system, water curtain system and water spray extinguishing system. The inlet qb/t 2358 ⑼ 8 plastic film packaging bag of this valve is connected to the water source on the side of the heat sealing strength test method, and the outlet side is connected to the system pipeline and nozzle. Generally, it is an empty pipe, which is only inflated in the pre action system. The opening of the deluge valve is controlled by various fire detection devices on the clamping surface of the sample, such as plastic film, fiber, etc

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