How is the fire pressure switch connected directly to the pump?
When the pressure value reaches the upper limit of the setting value of the electric contact pressure gauge, the pressure gauge disconnects the signal circuit and makes the relay and contactor lose power, and the pump stops working. As for the two pump with a prepared, it can be used in the control cabinet, control relay and contactor are respectively two pump, with "interlocking" form, and then access switch (which can take 2 or 1 pump pump preparation, preparation, use 2 pump with 1 pumps can also have to manually start the pump power can be achieved). If the requirements and monitoring signal of fire system or other equipment to achieve linkage, it should be from the fire control center (display, automatic fire control equipment monitoring and control center equipment) connected with a linkage control signal to the control loop to the pump
Pressure pump is usually connected to the fire sprinkler pipe and fire hydrant pipe on the pump, not for the main water supply, just to ensure that the pipes within the water pressure and set. This kind of pump work, usually by the electric contact pressure gauge on the pipeline control, the pressure gauge setting range lower limit value, electric contact pressure gauge closed, switch control relay, and the relay is connected with contactor control pump (suction), automatically pump up pressure.
It is the main wiring of wet alarm valve with a pressure switch between the hydraulic alarm and time delay, the signal module to the fire control center alarm, another alarm valve export control pressure switch on directly or through the spray pump control module.
