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: variable quantity, which is not influenced by the control but is introduced into the control system from outside with the aim of making the final controlled variable follow it in a given relationship; Name: command variable