Description: relationship between the npshr and the rate of flow at given operating/rated conditions of speed and liquid; Name: pump npsh 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 NPSH 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