PURPOSE: To facilitate the adjustment of transportation characteristics by providing a piston pump assembly at each of the outer side and inner side periphery of a piston support body and a flow control valve in the suction hole of the outer side piston assembly discharging relatively large quantity of fluid in an article supplying fluid to each of portions to be supplied with.

CONSTITUTION: An out side piston assembly 6 comprising many pistons 5 and an inner side piston assembly 8 comprising many pistons 7 are made to abut on the rocking disk 3 on the shaft 2 supported by a bearing 1, and the pistons 5 and 7 are fitted in the cylinder holes 5A and 7A of the piston supporting body 10 respectively. The pistons 5 and 7 are reciprocated by the rotation of a rocking disk 3 to discharge the fluid sucked in a rocking disk chamber 4 from a suction hole 11 to a level adjusting device through a discharge hole 32. In this case, a control valve 12 is provided in the middle of the suction hole 11, and the drive of the control valve 12 is controlled by an electro-magnet depending upon the temperature of cooling water.