Preaction system.docVIP

Preaction system: preaction system using preact alarm valve group, started by the automatic fire alarm system. Inadequate water at ordinary times, in the network in order to have pressure or non pressure gas, fire, by smoke or heat, photographic detector alarm and alarm signal delay after 30 seconds, automatic control system to open the gate and exhaust, start the prestressing effect to the water pipe network water filling valve. When the fire temperature continues to rise, automatic sprinkler sprinkler. Preaction system is wet sprinkler system with automatic detection alarm technology and the combination of the automatic control technology, it overcomes the wet and dry system faults, makes the system more reliable. Can be used for wet and dry system can use any place, can also replace the gas fire extinguishing system, but due to the wet and dry system more than normal for a set of control system for automatic detection alarm system is more complex, investment is bigger. Commonly used in building adornment demand is higher, there is no water loss, buildings and sites in a fire in a timely manner. Preaction sprinkler system pipeline, the longest distance according to the system water filling time is less than 3 minutes, the velocity of not less than 2 meters per second. After preaction valve pipe filled with gas pressure, the pressure should not be more than 0.03 million mpa. 1 P232 (2) open systems (rain) Open system adopts open sprinkler, fire detector, deluge valve, pipe and open sprinkler. A fire, the fire detection system automatically open a deluge valve, also can open the deluge valve, manual by the deluge valve to control the water distribution channel all open nozzle spray water at the same time, can spew out huge quantities of water in a flash fire area, put out the fire. The rain fire extinguishing system with large water yield, fire control area is large, the advantages of fire in a timely manner, but the water damage is greater than the closed system