Wet alarm valve, pressure switch reported fire, the template lights red, display input action, pressure 0.8, spray pump pressure 0.7,
To solve this situation: (1) the end of the water, open to the maximum and the duration of water to be long; (2) the pressure switch is more sensitive; (3) at the same time more than two ends of the water. If a real fire occurs, the sprinkler is blown out of the water, is continuous water, and generally not a sprinkler was burned, each sprinkler is 25 pipe, then the pressure before and after the valve will not be balanced , The pressure switch, the alarm is easy to alarm.
And the water flow out of the valve after the flow to the bypass of the water pressure and flow larger, can make the pressure switch, alarm bell alarm. And the end of the water discharge device is 25 of the tube, when the water flow is relatively small, if the water time is short, wet alarm valve to open a short time, from the constant pressure pipe to add water into the sprinkler system before and after the pressure quickly balanced , So that the wet alarm valve closed, bypass the flow of water pressure and flow are very small, coupled with the role of the delay device, which can not reach the pressure switch and alarm action, alarm requirements, the greater the easier spray system This is the case because the capacity in the sprinkler system is large.
Wet alarm valve can be imagined as a one-way valve, when the valve before the pressure is greater than the valve pressure will automatically open, both ends of the pressure balance when closed. Wet alarm valve installed in the main spray pipe is more than 150 or 100 of the tube. Start the spray pump when the pump pressure, so that the valve before the pressure is much greater than the valve after the pressure.
