BRIEF DESCRIPTION OF THE DRAWINGS [0033]FIGS. 1A and 1B are a schematic cross sectional view and a left side view, respectively, of a flow control valve according to an embodiment of the present invention. [0034]FIGS. 2A and 2B are a top plan view and a partially cutaway view, respectively, of an actuating shaft of the relevant flow control valve. [0035]FIGS. 3A and 3B illustrate arrangement of pe