Check valve

止回阀这种类型阀门的作用是只允许介质向一个方向流动，而且阻止反方向流动。通常这种阀门是自动工作的，在一个方向流动的流体压力作用下，阀瓣打开；流体反方向流动时，由流体压力和阀瓣的自重合阀瓣作用于阀座，从而切断流动。

Check valve the function of this type of valve is to only allow the medium to flow in one direction and prevent the flow in the opposite direction. Normally, this valve works automatically. Under the pressure of fluid flowing in one direction, the valve flap opens; When the fluid flows in the opposite direction, the fluid pressure and the self weight of the valve disc act on the valve seat to cut off the flow.

信号蝶阀

Signal butterfly valve

信号蝶阀就是普通蝶阀加了一组信号线并和监视模块一起连接到消防报警主机，信号（输入模块）模块指示灯常亮是阀门关闭，模块信号指示灯闪亮是阀门正常打开。消防中的信号蝶阀就是消防管网中的开关，因为消防管网的水必须保持畅通，这样才能保证灭火的及时性，所以信号蝶阀一旦关闭，信号模块就会报反馈信息给主机，通知监控消防管网处于关闭状态。而普通蝶阀的开闭不能通过报警主机得知，只能现场查看。

The signal butterfly valve is an ordinary butterfly valve with a set of signal lines and is connected to the fire alarm host together with the monitoring module. If the indicator light of the signal (input module) module is always on, the valve is closed, and if the indicator light of the module is flashing, the valve is normally opened. The signal butterfly valve in fire fighting is the switch in the fire fighting pipe network. The water in the fire fighting pipe network must be kept unblocked so as to ensure the timeliness of fire fighting. Therefore, once the signal butterfly valve is closed, the signal module will report the feedback information to the host to inform the monitoring center that the fire fighting pipe network is closed. The opening and closing of ordinary butterfly valves can not be known through the alarm host, but can only be checked on site.

阀

Safety valve

阀在系统中起保护作用。当系统压力超过规定值时，阀打开，将系统中的一部分气体/流体排入大气/管道外，使系统压力不超过允许值，从而保证系统不因压力过高而发生事故。阀属于自动阀，平时不需要人去开启或者关闭，当管道内气体（液体）压力超过规定值时，压力会自动顶开阀上的弹簧装置，将超压部分的气体（液体）排出。

The safety valve plays a safety protection role in the system. When the system pressure exceeds the specified value, the safety valve is opened to discharge part of the gas / fluid in the system into the atmosphere / pipeline, so that the system pressure does not exceed the allowable value, so as to ensure that the system will not have accidents due to the high pressure. The safety valve is an automatic valve. Normally, no person is required to open or close it. When the pressure of gas (liquid) in the pipeline exceeds the specified value, the pressure will automatically open the spring device on the safety valve to discharge the gas (liquid) in the overpressure part.

低泄高封阀

Low relief high seal valve

低泄高封阀的作用是为了防止系统由于驱动气体泄漏的累积而引起系统的误动作而在管路中设置的阀门。它安装在系统启动管路上，正常情况下处于开启状态，只有在进口压力达到设定压力时才关闭，其主要作用是排除由于气源泄漏积低泄高封阀聚在启动管路内的气体。轻微泄漏的气体压力不足以顶动弹簧，气体顺着弹簧两边的出气孔排出，一旦气体压力超过低泄高封阀设定的数值，气压顶动弹簧封住出气孔，保证驱动气体的压力能打开启动气瓶。

The function of the low leakage high sealing valve is to prevent the system from misoperation due to the accumulation of drive gas leakage. It is installed on the start-up pipeline of the system and is normally open. It is closed only when the inlet pressure reaches the set pressure. Its main function is to remove the gas accumulated in the start-up pipeline due to the leakage of the gas source. The slightly leaked gas pressure is not enough to push the spring, and the gas will be discharged along the air outlets on both sides of the spring. Once the gas pressure exceeds the value set by the low pressure relief high pressure sealing valve, the air pressure pushing spring will seal the air outlet to ensure that the pressure of the driving gas can open the starting gas cylinder.

浮球阀

Float valve

大圆球为空心，密度远低于水，浮漂始终都要漂在水上，当水面上涨时，浮漂也跟着上升。浮漂上升就带动连杆也上升。连杆与另一端的阀门相连，当上升到一定位置时，连杆支起橡胶活塞垫，封闭水源。当水位下降时，浮漂也下降，连杆又带动活塞垫开启。常用于消防水池和屋顶水箱的补水，到了规定的液位值，自动停止补水。

The large round ball is hollow and its density is far lower than that of water. The float always floats on the water. When the water surface rises, the float also rises. When the float rises, the connecting rod also rises. The connecting rod is connected to the valve at the other end. When it rises to a certain position, the connecting rod supports the rubber piston pad to close the water source. When the water level drops, the float also drops, and the connecting rod drives the piston pad to open. It is commonly used for water replenishment of fire pool and roof water tank. When the specified liquid level is reached, the water replenishment will be automatically stopped.

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