预作用装置是由预作用报警阀组、控制盘、气压维持装置、空气供给装置及管路附件等部件组成。下面川消小编为您讲解更多事项：

The pre action device is composed of pre action alarm valve group, control panel, air pressure maintenance device, air supply device, and pipeline accessories. Below, the editor of Chuanxiao will explain more matters to you:

（一）水源控制阀

（1） Water source control valve

预作用阀的供水侧和系统侧（一头一尾）都安装有水源控制阀，以利于检修。这两个水源控制阀都应采用信号阀，平时是常开状态。

Water source control valves are installed on both the water supply side and the system side (head to tail) of the pre action valve for easy maintenance. Both water source control valves should use signal valves, which are usually in a normally open state.

（二）控制腔

（2） Control chamber

1.从供水侧直接向控制腔供水，该管路上安装有过滤器、止回阀和压力表。管路是常通管路无控制阀。控制腔充满水伸缩杆会压紧阀瓣，系统进入伺应状态。

1. Directly supply water to the control chamber from the water supply side, which is equipped with a filter, check valve, and pressure gauge. The pipeline is a normal flow pipeline without a control valve. The control chamber is filled with water, and the telescopic rod will compress the valve disc, causing the system to enter a waiting state.

2.如有火情，消防联动控制器启动系统，发信号同时打开：预作用阀组的电磁阀；排气阀前的电动阀；消防水泵。

If there is a fire, the fire linkage controller starts the system and sends a signal to open the solenoid valve of the pre action valve group; Electric valve in front of exhaust valve; Fire water pump.

3.预作用阀组的电磁阀就在控制腔的管路上，此阀打开就会将控制腔的水放出，从而伸缩杆回收，阀瓣打开，水流入报警管路。此管路上还安装有手动快开阀，在自动开电磁阀失效后，手动打开手动快开阀，也就会将控制腔的水放出，从而伸缩杆回收，阀瓣打开，水流入报警管路。

3. The solenoid valve of the pre action valve group is located on the pipeline of the control chamber. Opening this valve will discharge the water in the control chamber, allowing the telescopic rod to recover, the valve disc to open, and water will flow into the alarm pipeline. There is also a manual quick opening valve installed on this pipeline. After the automatic opening solenoid valve fails, manually opening the manual quick opening valve will also discharge the water in the control chamber, allowing the telescopic rod to recover, the valve disc to open, and water will flow into the alarm pipeline.

（三）报警管路

（3） Alarm pipeline

1.报警管路位于雨淋阀的上腔，阀瓣打开水就会流入报警管路，从而使得报警阀压力开关和水力警铃动作。

1. The alarm pipeline is located in the upper chamber of the deluge valve. When the valve disc is opened, water will flow into the alarm pipeline, causing the pressure switch of the alarm valve and the hydraulic alarm bell to operate.

2.另外从供水侧也接了一根管路通向报警阀压力开关和水力警铃，这就是试警铃管路。因为该管路是从供水侧接入，所以可以做到在阀瓣没有打开的情况下，测试警铃和压力开关的性能。试警铃管路必须设置常闭控制阀，此控制阀一旦开启供水侧的水就会立即进入管路，从而使得报警阀压力开关和水力警铃误动作。

In addition, a pipeline is also connected from the water supply side to the alarm valve pressure switch and hydraulic alarm bell, which is the test alarm bell pipeline. Because the pipeline is connected from the water supply side, it is possible to test the performance of the alarm bell and pressure switch without opening the valve disc. The test alarm bell pipeline must be equipped with a normally closed control valve. Once this control valve is opened, water on the water supply side will immediately enter the pipeline, causing the alarm valve pressure switch and hydraulic alarm bell to malfunction.

（四）预作用系统的充气设备

（4） Inflation equipment for pre action systems

1.预作用装置是由预作用报警阀组、控制盘、气压维持装置、空气供给装置及管路附件等部件组成。

1. The pre action device is composed of pre action alarm valve group, control panel, air pressure maintenance device, air supply device, and pipeline accessories.

2.预作用式系统报警阀以后的配水管道（系统侧管网）当出现少量的泄漏时，气压维持装置通过节流孔补压，维持管网压力。

When there is a small amount of leakage in the water distribution pipeline (system side pipe network) after the pre acting system alarm valve, the air pressure maintenance device supplements the pressure through the throttle hole to maintain the pressure of the pipe network.

3.气压维持装置设置有带阀门的旁通管路，主要用于管网的大规模充气（如管网初次充气）。

3. The air pressure maintenance device is equipped with a bypass pipeline with valves, mainly used for large-scale inflation of the pipeline network (such as initial inflation of the pipeline network).

4.为了自动调节管网压力，通常会配套专用的控制盘或压力变送器（或电接点压力表）实现管网压力的自动控制。控制盘应具备自身（包括探测、控制回路）故障报警和高、低气压报警功能。

In order to automatically adjust the pressure of the pipeline network, a dedicated control panel or pressure transmitter (or electric contact pressure gauge) is usually equipped to achieve automatic control of the pipeline network pressure. The control panel shall have its own (including detection and control circuit) fault alarm and high and Low-pressure area alarm functions.

5.预作用装置系统侧充气压力范围宜设置为0.03 MPa～0.05 MPa，即气压维护装置控制的压力范围；管网内检测气压的下限报警压力值不应低于0.02 MPa。

5. The range of inflation pressure on the system side of the pre action device should be set to 0.03 MPa~0.05 MPa, which is the pressure range controlled by the air pressure maintenance device; The lower limit alarm pressure value for detecting air pressure in the pipeline network should not be less than 0.02 MPa.

6.报警阀启动后，需要自动停止系统的充气和补压，可以通过控制盘实现；也可以通过报警阀的压力开关动作信号，连锁关闭空气供给装置。

After the alarm valve is activated, it is necessary to automatically stop the inflation and pressure replenishment of the system, which can be achieved through the control panel; The air supply device can also be interlocked and closed through the pressure switch action signal of the alarm valve.

（五）试验管路及自动滴水阀

（5） Test pipeline and automatic drip valve

1.预作用报警阀组调试采用检测、试验管道进行。具体方法如下：

1. The pre action alarm valve group is debugged using detection and testing pipelines. The specific methods are as follows:

①关闭系统的水源控制阀，同时打开试验管道控制阀。这样做的目的是防止水流入防护区，造成不必要的水渍损失。②阀瓣在规定时间内开启。③当报警水压为0.05MPa，水力警铃发出报警铃声。

① Close the water source control valve of the system and open the test pipeline control valve at the same time. The purpose of doing so is to prevent water from entering the protective zone and causing unnecessary water damage The valve disc opens within the specified time. ③ When the alarm water pressure is 0.05MPa, the hydraulic alarm bell will sound an alarm bell.

2.自动滴水阀自动滴水阀安装在雨淋阀的上腔，上腔平时无水，如果报警阀阀体漏水，或者管道内存有积水，会从自动滴水阀排走。还有什么问题就来我们网站http://www.cx-fire.com咨询！

2. The automatic drip valve is installed in the upper chamber of the deluge valve. The upper chamber is usually free of water. If the alarm valve body leaks or there is accumulated water in the pipeline, it will be discharged from the automatic drip valve. If you have any further questions, please come to our website http://www.cx-fire.com consulting service