Device for supplying coolant, and cooling water system

An apparatus for supplying coolant to a processing device to be supplied with a fluid coolant, wherein the processing device has at least two regions or tools to be cooled, the apparatus comprising:

• an open or closed coolant circuit with a supply side and a return side, wherein the regions or tools to be cooled are incorporated in the open or closed coolant circuit;
• a reduced pressure generation unit arranged in the return side, wherein the regions or tools to be cooled each have a supply side inlet and a return side outlet;
• a valve arranged respectively before each supply side inlet and after each return side outlet of the regions or tools to be cooled,
• wherein, when the reduced pressure generation unit is activated, a reduced pressure is produced in the coolant circuit in the supply side inlet and the return side outlet of each of the regions or the tools to be cooled, and
• wherein the reduced pressure generating unit is arranged downstream of the valve in the direction of flow of the fluid coolant.