The Working Principle of the Pressure Tank

How does the fire pump work? How does pressure tank work? How does the fire pump deliver water? What is the driving force behind the operation of the fire pump? As we all know, the compositions of the fire pump include the impeller, the pump body, the pump shaft, the bearing, the seal ring, the motor, and other components. In addition, the working power is inseparable from the pressure tank.

The pressure tank is used in the closed water circulation system to balance the amount of water and pressure, to avoid frequent opening of the safety valve and frequent replenishment of the automatic water supply valve. Pressure tanks are sometimes called surge tanks.

So, what is the working principle of the pressure tank?

The pressure tank is mainly composed of a valve cover, an inflation port, an airbag, a carbon steel can body and others. When the pressure tank is connected to the water system, it acts as an accumulator. When the system water pressure is greater than the nitrogen pressure between the carbon steel tank of the expansion tank and the airbag, the system water will be squeezed into the expansion tank under the pressure of the system. As thus, the nitrogen gas between the tank body and the airbag is compressed, the volume is reduced, and the pressure is increased. In addition, the pressure tank will increase the storage space of the entire water of the system, so that the system pressure is reduced until the pressure of the system water and the nitrogen pressure between the tank and the airbag reach a new balance to stop the water inflow.