| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To save energy of secondary pumps under low load without causing insufficient differential pressure of a loading apparatus having a large load requirement under low load of another loading apparatus at a terminal end. <P>SOLUTION: Valve differential pressuresΔPV1-ΔPV3 measured in loading apparatuses 12-1 to 12-3 are transmitted to a control device 11. The control device 11 obtains the valve differential pressuresΔPV1-ΔPV3 from the loading apparatuses 12-1 to 12-3, extracts a minimum differential pressureΔPVmin from the obtained valve differential pressuresΔPV1-ΔPV3, determines a set value PSsp of the water supply pressure so that the extracted minimum differential pressureΔPVmin becomes a prescribed value (0.3 kg/cm<SP>2</SP>, for example) or more, and controls the rotational speed of secondary pumps 6-1 to 6-3 and the opening of a bypass valve 8 so that a measurement value PSpv of the water supply pressure becomes the set value PSsp. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
