预作用报警阀是将火灾探测报警技术和自动喷水系统结合起来，对保护对象起双重保护作用的自动喷水灭火装置。具有干式系统的特点。预作用报警阀通常安装于那些既需要用水灭火，但又不允许发生非火灾原因而喷水的地方。适用于贮藏真本的图书馆、档案室、博物馆、贵重物品贮藏室、电脑机房等。下面川消小编为您讲解更多：

The pre action alarm valve is an automatic sprinkler system that combines fire detection and alarm technology with an automatic sprinkler system to provide dual protection for the protected object. It has the characteristics of a dry system. Pre action alarm valves are usually installed in places that require water to extinguish fires, but do not allow water to be sprayed for non fire reasons. Suitable for storing rare and authentic books in libraries, archives, museums, storage rooms for valuable items, computer rooms, etc. Below, the editor of Chuanxiao will explain more to you:

预作用系统的预作用报警阀是由雨淋阀和湿式报警阀上下串接而成，雨淋阀位于供水侧，湿式报警阀位于系统侧而成为预作用阀组。系统由预作用阀水力警铃、压力开关、空压机、空气维护装置、信号碟阀等组成，安装闭式洒水喷头，并以常用的探测系统作为报警和启动的装置。

The pre action alarm valve of the pre action system is composed of a deluge valve and a wet alarm valve connected in series. The deluge valve is located on the water supply side, and the wet alarm valve is located on the system side, forming the pre action valve group. The system consists of a pre action valve hydraulic alarm bell, pressure switch, air compressor, air maintenance device, signal disc valve, etc., equipped with a closed sprinkler head, and commonly used detection systems as alarm and start devices.

其动作原理：一旦发生火灾，安装在保护区感温感烟火灾探测器发出火灾报等信号。火灾报警控制器或消防控制中心，接到报警信号后发出指令打开雨淋阀上电磁阀，使雨淋阀开启，压力水流进系统侧管网，变成湿式喷水系统，同时水力警铃发出报苦，压力开关动作反馈给控制中心显示管路已充水，并启动消防泵。

Its operating principle: In the event of a fire, a temperature and smoke sensing fire detector installed in the protected area will emit a fire alarm and other signals. After receiving the alarm signal, the fire alarm controller or fire control center sends a command to open the electromagnetic valve on the deluge valve, causing the deluge valve to open. The pressure water flows into the system side pipe network, becoming a wet water spraying system. At the same time, the hydraulic alarm bell emits a distress signal, and the pressure switch action feedback to the control center shows that the pipeline has been filled with water, and the fire pump is started.

此时管道上安装闭式洒水喷头尚未释放，不会喷水。人尚可主动地经主管人员采取适当行动将火扑灭，避免喷头动作水渍造成的损失。如果火灾控制不住继续发展，致使闭式喷头玻璃球动作喷水，水泵自动启动。更多相关产品信息了解就来我们网站http://www.cx-fire.com咨询！

At this point, the closed sprinkler head installed on the pipeline has not yet been released and will not spray water. People can actively take appropriate actions by the supervisory personnel to extinguish the fire and avoid losses caused by water stains caused by nozzle action. If the fire cannot be controlled and continues to develop, causing the closed nozzle glass ball to act and spray water, the water pump will automatically start. For more information on related products, come to our website http://www.cx-fire.com consulting service