Description: Difference of the total energy head at the outlet side of the pump to the total energy head at the inlet side of the pump; Name: energy circulating lift of the pump
Description: difference between the total head at the outlet side of the pump and the total head at the inlet side of the pump; Name: lift circulating pump
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