PURPOSE: To eliminate mechanically movable section and to enable long time operation under severe conditions by forming an enclosed loop of magnetic fluid and flowing the fluid with external magnetic force thereby carrying and pressurizing the fluid to be transported by means of the magnetic fluid.

CONSTITUTION: A fluid system comprises a pressurizing cylinder 1, magnetic fluid 8, a separator 2 for separating the fluid 9 to be transported and a return pipe 3 for the fluid 8. A drive control system comprises a linear motor 4 for moving the fluid 8, a magnetic valve 5 for controlling the flow and the pressure of the fluid 8 and a magnetic pole 6 for promoting separation of the fluids 8, 9. By such arrangement, no mechanically movable section is required and long time operation can be carried out under severe conditions of plant handling noxious material.