預作用裝置是由預作用報警閥組、控制盤、氣壓維持裝置、空氣供給裝置及管路附件等部件組成。下面川消小編為您講解更多事項：

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）水源控制閥

（1） Water source control valve

預作用閥的供水側和系統側（一頭一尾）都安裝有水源控制閥，以利于檢修。這兩個水源控制閥都應采用信號閥，平時是常開狀態。

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.從供水側直接向控制腔供水，該管路上安裝有過濾器、止回閥和壓力表。管路是常通管路無控制閥。控制腔充滿水伸縮桿會壓緊閥瓣，系統進入伺應狀態。

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，消防聯動控制器啟動系統，發信號同時打開：預作用閥組的電磁閥；排氣閥前的電動閥；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.預作用閥組的電磁閥就在控制腔的管路上，此閥打開就會將控制腔的水放出，從而伸縮桿回收，閥瓣打開，水流入報警管路。此管路上還安裝有手動快開閥，在自動開電磁閥失效后，手動打開手動快開閥，也就會將控制腔的水放出，從而伸縮桿回收，閥瓣打開，水流入報警管路。

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）報警管路

（3） Alarm pipeline

1.報警管路位于雨淋閥的上腔，閥瓣打開水就會流入報警管路，從而使得報警閥壓力開關和水力警鈴動作。

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.另外從供水側也接了一根管路通向報警閥壓力開關和水力警鈴，這就是試警鈴管路。因為該管路是從供水側接入，所以可以做到在閥瓣沒有打開的情況下，測試警鈴和壓力開關的性能。試警鈴管路必須設置常閉控制閥，此控制閥一旦開啟供水側的水就會立即進入管路，從而使得報警閥壓力開關和水力警鈴誤動作。

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）預作用系統的充氣設備

（4） Inflation equipment for pre action systems

1.預作用裝置是由預作用報警閥組、控制盤、氣壓維持裝置、空氣供給裝置及管路附件等部件組成。

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.預作用式系統報警閥以后的配水管道（系統側管網）當出現少量的泄漏時，氣壓維持裝置通過節流孔補壓，維持管網壓力。

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.氣壓維持裝置設置有帶閥門的旁通管路，主要用于管網的大規模充氣（如管網初次充氣）。

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.為了自動調節管網壓力，通常會配套專用的控制盤或壓力變送器（或電接點壓力表）實現管網壓力的自動控制。控制盤應具備自身（包括探測、控制回路）故障報警和高、低氣壓報警功能。

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.預作用裝置系統側充氣壓力范圍宜設置為0.03 MPa～0.05 MPa，即氣壓維護裝置控制的壓力范圍；管網內檢測氣壓的下限報警壓力值不應低于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.報警閥啟動后，需要自動停止系統的充氣和補壓，可以通過控制盤實現；也可以通過報警閥的壓力開關動作信號，連鎖關閉空氣供給裝置。

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）試驗管路及自動滴水閥

（5） Test pipeline and automatic drip valve

1.預作用報警閥組調試采用檢測、試驗管道進行。具體方法如下：

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

①關閉系統的水源控制閥，同時打開試驗管道控制閥。這樣做的目的是防止水流入防護區，造成不必要的水漬損失。②閥瓣在規定時間內開啟。③當報警水壓為0.05MPa，水力警鈴發出報警鈴聲。

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.自動滴水閥自動滴水閥安裝在雨淋閥的上腔，上腔平時無水，如果報警閥閥體漏水，或者管道內存有積水，會從自動滴水閥排走。還有什么問題就來我們網站http://www.xintli.net咨詢！

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.xintli.net consulting service