干式报警阀的动作原理以及设置要求
来源：http://www.cx-fire.com/ 日期：2023-07-03
干式报警阀的动作原理：（以差动比为5：1的干式报警阀为例）
The operating principle of the dry alarm valve: (Taking the dry alarm valve with a differential ratio of 5:1 as an example)
火灾发生时，喷头开启，节流孔的补气速度远小于喷头喷放速度，系统侧管网气压迅速降低，当气压降到供水侧水压的五分之一以下时，阀瓣上、下腔的平衡被破坏，干式阀开启，水流进入系统侧管网。
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.
干式阀开启后，水流从中间室流向报警水道，驱动水力警铃和压力开关动作，同时滴水阀在水压的作用下自动关闭。
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.
压力开关连锁启动消防水泵和电动阀，快速排气阀排气，加速管网充水。
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在准工作状态（警戒状态）时，报警阀以后的配水管道（系统侧管网）充有一定压力的气体，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 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系统侧管网的气压值，需要根据干式报警阀入口前的水源压力，结合干式报警阀的工作性能确定（不同厂家的干式报警阀组，工作差动比有所区别）
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报警阀的阀体被阀瓣分成上、下两腔，上腔（系统侧）连接充有压缩气体的系统侧管网，下腔（供水侧）连接水源。
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报警阀的阀瓣扣在气密封座和水密封座上，其中气密封座的直径大于水密封座的直径，两个密封座被中间室隔离，中间室连通报警水道，通过滴水阀与大气相通。
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气密封座的面积（阀瓣上面面积）大于水密封座的面积（阀瓣下面接触水的面积），系统侧只需要较小的气体压力就能平衡供水侧较高的水压
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为了干式报警阀的耐用程度（防止动作部件粘结）和保证更好的气密性，通常需要在系统侧底座加注底水
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为防止阀瓣组件在动作以后重新回到其关闭位置上，干式报警阀应设置有防复位锁止机构。
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干式报警阀的滴水阀，通过小孔与大气相通，用于排出中间室的少量渗水，防止系统误动，滴水阀在水流加大时自动关闭。
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.
That's all for the explanation of the operation principle and setting requirements of the dry alarm valve. We hope you can prepare well after reading it to avoid improper operation affecting its use. If you have any needs, please contact us to order http://www.cx-fire.com Come on!
