Toilet bowl flushing device

A toilet bowl flushing device comprising:

• water supply means for supplying flushing water to a toilet bowl, said water supply means including flow rate control valve means for controlling a rate of flow of flushing water to be supplied to the toilet bowl;
• actuator means for actuating said flow rate control valve means through a reciprocally movable plunger, said actuator means being operable in an inching manner so that the plunger is axially moved in increments or decrements of minute distance;
• and
• control means operable according to a predetermined flow rate pattern program for controlling operation of said actuator means to vary the rate of flow of flushing water by moving the plunger in a stepwise manner in one flushing cycle with respect to time from a time to start flushing the toilet bowl to a time to finish flushing the toilet bowl.