Continuous operation is possible when the mean hydraulic power obtained based on the pressure and flow rate during operation of 1 cycle is lower than the hydraulic power for the continuous rating range in the figure above and also the root-mean-square of the load pressure is within the maximum pressure for the continuous rating range.

(With the double pump type unit shown in the figure above with independent flow selected, continuous operation with the pressure held at 20.6 MPa is possible. However, for cycles that include pressure holding for 3 minutes or longer, a bleed off circuit equivalent to the capacity of a single pump running at 150 min-1 must be provided at the pump discharge side to cool the pump.)