who is the pressure, and what is the relationship between the flow indicator, the younger do not understand,
When the automatic sprinkler system, a nozzle spray water, the upper part of the alarm valve pressure is lower than the lower pressure, the alarm valve open, the water into the fire extinguishing system piping, and into the delay and hydraulic alarm pipeline, alarm bell alarm, in the same The pressure switch on the pipeline action, and the pressure switch connected to the signal line to the fire pump to start the pump.
which signal do you say? Is the wet alarm valve, the pressure switch and the valve is not much of a relationship.
the water flow indicator is installed on the system piping, if there is water flow will feedback information to the fire control room, so that a section of a pipe area through the water, fire extinguishing system is normal. This is not related to the pressure switch.
