Any one of the pressure switch action to start the same solenoid valve to open the spray pump
B, when the double-contact pressure switch, the problem is simple, as long as a group of contacts wiring to the spray pump control cabinet, another group of contacts connected to the alarm host. Now the actual engineering applications, double contact pressure switch with more and more.
The current pressure switch directly open pump generally have the following two ways: 1, the project no alarm system, only the sprinkler system, then the pressure switch control line only need to take the spray control in the passive contact. 2, if the alarm system, the pressure switch must both alarm to the alarm host should also start the spray pump, specifically now two methods: A when the single-contact pressure switch, to add an intermediate relay , Then need 24V power supply, through the relay, a route to the spray pump control cabinet, another way to the alarm host.
"Automatic sprinkler system design specifications" GB 50084-2001 (2005 edition) in Article 11..1 1 provides: "wet system, dry system nozzle action, the pressure switch should be directly linked to automatically start the water pump"
