Alarm valve is automatically sprinkler system is turned on or shut off the water, and start the alarm device. Automatic sprinkler system, alarm valve is a critical component, its role is turned on or shut off the water output alarm signal and prevent water flow down back to the water supply source, and through the alarm valve system of water supply device and alarm means for testing. The alarm valve depending on the system is divided into wet alarm valve, dry alarm valve and deluge valve. The alarm valve nominal diameter generally 50,65,80,100,125,150,200 MM seven. 1, wet alarm valve for wet sprinkler system. Its main function is: When the nozzle is open, wet valve can be automatically opened, and water flows into the water alarm alarm signal. The wet valve according to the structure in the form three types: the seat wet type valve, the pilot valve wet-type valve, butterfly valve wet valve. Fire extinguishers of Shenzhen, Shenzhen extinguisher annual inspection, fire extinguisher box, fire equipment, fire maintenance, Nanshan, Shenzhen Tian Lake Fire Nanshan safety fire equipment repair center [http://www.szytxffm.net the Shenzhen extinguishers, www.0755119.net Shenzhen Fire fire engineering in Shenzhen, Shenzhen, fire equipment, fire-fighting equipment in Shenzhen, Shenzhen Fire for the record, fire safety, Nanshan, Shenzhen Fire Maintenance and dry alarm valve is used to dry alarm system. The shutter valve is divided into two parts, the outlet side connected with the system of the number of tubes and nozzles, filled with compressed air, and the inlet side is connected with the water. Dry alarm valve torque difference of both sides of the air pressure and water pressure on the valve control valve closed and open, and generally can be divided into two kinds of differential dry alarm valve and closed dry alarm valve. 3, deluge valve for rain sprinkler systems, pre-action sprinkler system, water curtain system and water spray fire-extinguishing system. This inlet side of the valve and the water is connected to the outlet side is connected to the system piping and sprinklers, generally empty pipe, pre-action system only inflatable. The deluge valve opening device controlled by a variety of fire detectors. Double disc type, diaphragm, lever-type piston-type and temperature-sensitive type deluge valve several. The monitor is used to monitor the working status of the system and send status information to an electrical signal to the alarm controller. Its main flow indicator, valves limit pressure monitor, pressure monitors, air pressure retainer and water level monitoring, etc.. Flow indicator flow signal is converted into an electrical signal, installed in the beginning of water distribution mains or distribution mains. Its role is when the fire sprinklers turn on the sprinkler or pipe leak or control center to show the the nozzle spray area and floors, from the role of auxiliary electric alarm. The valve stopper is one trip switch is also called the signal valve, usually configured in the total control of the gate valve of the dry pipe and through large diameter and a branched pipe valve for monitoring the gate valve opened state, Once the the hygiene part or all closed, Jixiang alarm system controller alarm signal. Pressure monitor is a working point can be adjusted within a certain range of the pressure switch, automatic switch control device is often used as a regulator pump automatic sprinkler system. Alarm alarm is an audible alarm signal device, including water alarm pressure switch. Water alarm audible warning device is starting a flow of impact. Its characteristics as the structure is simple, durable and reliable, high sensitivity, less maintenance, and sprinkler many of the missing parts of each system. The pressure switch is an electrical switch by hydraulic or pneumatic drive, usually together with water alarm installation. Pressure switch hydraulic closed weak circuit implementation alarm. When the alarm valve to open the valve, pressure water through pipes into the delay first inflow pressure switch cavity, then promote the diaphragm moves up, the top of the column is also rising at the same time, the lower spring plate from the top contact contact closure, connect circuit, an electric signal input alarm control box, an alarm signal to start the fire pump.