Said the flow of the pump and the pressure switch switch role
Pressure switch, if the sensor pressure to reduce, (generally supporting a regulator pump, useful water pressure will be reduced), put the signal to the pump, pump start.
Flow switch with the pressure switch, first of all, is to start the pump switch. Are installed on the pipeline, and should be accurate on the pump outlet pipe.
Flow switch, if the sensor to the water, (indicating the need for water), put the signal to the pump, the pump starts.