Differenzdruck

Differential pressure, otherwise known as total dynamic head, is the difference between the discharge pressure and the inlet pressure.

Differential pressure is a function of the system and must be calculated or measured. Measurements can be made at the gauge ports near the inlet and outlet ports of the pump.

Differential Pressure = (Outlet Pressure) – (Inlet Pressure)

Yes! For example, a pump is at the bottom of a very tall, very full tank and the pump has a very short discharge pipe. The head pressure acting on the pump's inlet side may be greater than the discharge pressure due to viscous line losses. In this scenario you could omit the pump and let gravity empty the tank but a pump can expedite this and allows you to control the rate of flow.