现在很多相应要求的消防产品的需求量越来越大，由于北方的天气条件，对预作用报警阀的需求更加广泛，下面为了更好的使用它，跟着川消小编来了解下相关问题--预作用报警阀安装什么样的喷淋头。

At present, the demand for many fire protection products with corresponding requirements is increasing. Due to the weather conditions in the north, the demand for pre action alarm valves is more extensive. In order to better use it, we will follow the Sichuan Xiaobian to understand the related problem -- what kind of sprinkler head is installed for the pre action alarm valve.

1、采用闭式喷头。

1. The closed nozzle is adopted.

2、预作用系统平时不充水，当探头报警后，系统管道才开启充水，到了规定温度，喷头玻璃球破裂喷水。

2. The preaction system is not filled with water at ordinary times. When the probe gives an alarm, the system pipeline starts to fill with water. When the specified temperature is reached, the glass ball of the nozzle breaks and sprays water.

3、预作用系统预作用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。

3. The pre action valve of the pre action system is composed of a deluge valve and a wet alarm valve in series from top to bottom. The deluge valve is located at the water supply side, and the wet alarm valve is located at the system side, forming a pre action valve group. The system is composed of pre action valve hydraulic alarm bell, pressure switch, air compressor, air maintenance device, signal butterfly valve, etc. The closed sprinkler head is installed, and the commonly used detection system is used as the alarm and starting device.

其动作原理：

Its action principle:

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。

In case of fire, the temperature and smoke detectors installed in the protection area will send out fire alarm and other signals. After receiving the alarm signal, the fire alarm controller or the fire control center sends a command to open the solenoid valve on the deluge valve to open the deluge valve. The pressure water flows into the pipe network at the system side and becomes a wet water spraying system. At the same time, the hydraulic alarm bell sends out a bitter alarm. The action of the pressure switch is fed back to the control center to show 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。

At this time, the closed sprinkler head installed on the pipe has not been released and will not spray water. The person in charge can take appropriate actions to extinguish the fire on his own initiative to avoid the loss caused by water stains caused by the action of the nozzle. If the fire cannot be controlled and continues to develop, the glass ball of the closed sprinkler will act to spray water, and the water pump will start automatically.

提醒：预作用报警阀组如果被使用到了户外，应该具有宝珠装置，防止被风砂、雨露以及阳光侵蚀；不应该被使用到有易燃、易爆气体以及粉尘的环境；预作用报警阀组不适合使用在湿热带和干热带的环境中；预作用报警阀组应该将管道介质的温度控制不超过450℃。

Reminder: if the pre action alarm valve group is used outdoors, it should have a jewel device to prevent it from being eroded by wind, sand, rain and sunshine; It shall not be used in the environment with flammable, explosive gas and dust; The pre action alarm valve group is not suitable for use in the humid and dry tropical environment; The pre action alarm valve group shall control the temperature of the pipeline medium to no more than 450 ℃.

预作用报警阀组不适合使用在-20℃以下的环境温度；预作用报警阀组很容易出现水淹或浸水的情况；预作用报警阀组不适合使用在环境中有放射性物质的情况；对于有盐雾、霉菌以及潮湿的环境和不适合使用；预作用报警阀组还应该避免剧烈振动和容易发生火灾的环境。

The pre action alarm valve group is not suitable for use at an ambient temperature below - 20 ℃; The pre action alarm valve group is easy to be flooded or immersed; The pre action alarm valve group is not suitable for use when there are radioactive substances in the environment; It is not suitable for use in the environment with salt fog, mold and humidity; The pre action alarm valve group shall also avoid violent vibration and fire prone environment.

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