Patent ID: 11073309

Abstract:
Control temperatures for a temperature control target are controlled in a plurality of steps. A lower temperature fluid supplied from first supply means (101) and a higher temperature fluid supplied from second supply means (102) are mixed together in a first three-way valve (103) for flow rate control to form a fluid for temperature control, and the fluid for temperature control is fed to the temperature control target. The fluid for temperature control returned from the temperature control target is distributed by a second three-way valve (108) for flow rate control so as to be returned to the first supply means and the second supply means. The lower temperature fluid prevented from being supplied from the first supply means to the first three-way valve for flow rate control is returned to the first supply means by a third three-way valve (112) for flow rate control through a bypass flow passage together with the fluid for temperature control distributed by the second three-way valve for flow rate control. Meanwhile, the higher temperature fluid prevented from being supplied from the second supply means to the first three-way valve for flow rate control is returned to the second supply means by a fourth three-way valve (116) for flow rate control through a bypass flow passage together with the fluid for temperature control distributed by the second three-way valve for flow rate control.