Description: relationship between the pump power input and the rate of flow at given operating/rated conditions of speed and liquid; Name: pump power input curve
Description: relationship between the net positive suction head required and the rate of flow at given operating conditions of speed and liquid; Name: Pump power input curve
Description: input variable to a comparing element in a controlling system, which sets the desired value of the controlled variable and is deducted from the command variable; Name: reference variable