Description: smallest flow rate at which the pump can operate without exceeding the noise and vibration limits specified in the order; Name: Min perm stable flow rate
Description: Lowest flow at which the pump can operate without exceeding the noise and vibration limits imposed in the order ; Name: Minimum allowable stable flow
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