干式報警閥的動作原理以及設置要求
來源：http://n3462.cn/ 日期：2023-07-03
干式報警閥的動作原理：（以差動比為5：1的干式報警閥為例）
The operating principle of the dry alarm valve: (Taking the dry alarm valve with a differential ratio of 5:1 as an example)
火災發(fā)生時,，噴頭開啟，節(jié)流孔的補氣速度遠小于噴頭噴放速度,，系統(tǒng)側管網(wǎng)氣壓迅速降低,，當氣壓降到供水側水壓的五分之一以下時，閥瓣上,、下腔的平衡被破壞,，干式閥開啟，水流進入系統(tǒng)側管網(wǎng),。
When a fire occurs, the nozzle opens, and the air supply speed of the throttle hole is much lower than the nozzle's discharge speed. The air pressure in the system side pipe network rapidly decreases. When the air pressure drops to less than one-fifth of the water pressure on the supply side, the balance between the upper and lower cavities of the valve disc is disrupted, and the dry valve opens, allowing water to enter the system side pipe network.
干式閥開啟后,，水流從中間室流向報警水道，驅動水力警鈴和壓力開關動作,，同時滴水閥在水壓的作用下自動關閉,。
After the dry valve is opened, water flows from the middle chamber to the alarm channel, driving the hydraulic alarm bell and pressure switch to operate. At the same time, the drip valve automatically closes under the action of water pressure.
壓力開關連鎖啟動消防水泵和電動閥，快速排氣閥排氣,，加速管網(wǎng)充水,。
The pressure switch interlocks to start the fire water pump and electric valve, and the fast exhaust valve exhausts the air, accelerating the water filling of the pipeline network.
Requirements for the setting of Chuanxiao dry alarm valve:
1在準工作狀態(tài)（警戒狀態(tài)）時，報警閥以后的配水管道（系統(tǒng)側管網(wǎng)）充有一定壓力的氣體,，當出現(xiàn)少量的泄漏時,，氣壓維持裝置通過節(jié)流孔補壓，維持管網(wǎng)壓力,。
When in the quasi working state (alert state), the water distribution pipeline (system side pipe network) after the alarm valve is filled with a certain pressure of gas. When a small amount of leakage occurs, the pressure maintaining device compensates through the throttle hole to maintain the pressure of the pipe network.
2系統(tǒng)側管網(wǎng)的氣壓值,，需要根據(jù)干式報警閥入口前的水源壓力，結合干式報警閥的工作性能確定（不同廠家的干式報警閥組，工作差動比有所區(qū)別）
The air pressure value of the 2 system side pipeline network needs to be determined based on the water source pressure before the inlet of the dry alarm valve, combined with the working performance of the dry alarm valve (different manufacturers' dry alarm valve groups have different working differential ratios)
3報警閥的閥體被閥瓣分成上,、下兩腔,，上腔（系統(tǒng)側）連接充有壓縮氣體的系統(tǒng)側管網(wǎng)，下腔（供水側）連接水源,。
The valve body of the 3 alarm valve is divided into upper and lower chambers by the valve disc. The upper chamber (system side) is connected to the system side pipe network filled with compressed gas, and the lower chamber (water supply side) is connected to the water source.
4報警閥的閥瓣扣在氣密封座和水密封座上,，其中氣密封座的直徑大于水密封座的直徑，兩個密封座被中間室隔離,，中間室連通報警水道,，通過滴水閥與大氣相通。
The valve disc of the 4 alarm valve is buckled on the gas seal seat and water seal seat, with the diameter of the gas seal seat greater than the diameter of the water seal seat. The two seal seats are isolated by the middle chamber, which is connected to the alarm water channel and is connected to the atmosphere through a drip valve.
5氣密封座的面積（閥瓣上面面積）大于水密封座的面積（閥瓣下面接觸水的面積）,，系統(tǒng)側只需要較小的氣體壓力就能平衡供水側較高的水壓
The area of the 5 gas seal seat (above the valve disc) is greater than the area of the water seal seat (below the valve disc), and the system side only needs a smaller gas pressure to balance the higher water pressure on the water supply side
6為了干式報警閥的耐用程度（防止動作部件粘結）和保證更好的氣密性,，通常需要在系統(tǒng)側底座加注底水
In order to ensure the durability of the dry alarm valve (preventing adhesion of the operating components) and better airtightness, it is usually necessary to add bottom water to the system side base
7為防止閥瓣組件在動作以后重新回到其關閉位置上，干式報警閥應設置有防復位鎖止機構,。
To prevent the valve disc assembly from returning to its closed position after action, the dry alarm valve should be equipped with an anti reset locking mechanism.
8干式報警閥的滴水閥,，通過小孔與大氣相通，用于排出中間室的少量滲水,，防止系統(tǒng)誤動,，滴水閥在水流加大時自動關閉。
The drip valve of the 8 dry alarm valve is connected to the atmosphere through a small hole and is used to discharge a small amount of water seepage from the middle chamber to prevent system misoperation. The drip valve automatically closes when the water flow increases.
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