P6W12D pressure control is a pressure control equipment which is designed for the fire protection system. Its characteristic is : it has a DPDT (double pole double throw) rapid action switch, at the same time it can make two different kinds of signal to control the pump of the fire protection system, and send out the alar signal. It is an automatic controller which works when it receives the pressure signal. In the equipment, when the controlled pressure is higher than the setting pressure, the pressure controller will send the signal to cut off the circuit (or alarm) to make the water pump stop working, and send out the alarm signal.