Cooling system for water-cooled apparatus

A system for cooling a water-cooled apparatus having a water inlet and a water outlet, the system comprising:

• a circuit in fluid communication with the water inlet and the water outlet of the water-cooled apparatus, the circuit having a valve upstream of the water inlet connected to a source of water, and an outlet in fluid communication with a sewer;
• an air-cooled cooling unit in heat exchange relationship with water in the circuit;
• and
• a pump fluidly connected to the circuit for circulating the water to and from the air-cooled cooling unit;
• the system operable between a closed-loop configuration and an open configuration, the valve being closed and the pump circulating water between the water-cooled apparatus and the air-cooled cooling unit in the closed-loop configuration, and the valve being open and water in the circuit circulating from the source of water, through the water-cooled apparatus, and to the sewer in the open configuration,
• wherein the valve includes a first three-way valve and a second three-way valve, the first three-way valve and the second three-way valve are parts of a single valve body having a valving member, the valving member having a first position in which both of the water inlet and the water outlet of the water-cooled apparatus are fluidly connected with the reservoir through the single valve body and in which fluid communication is blocked between the water-cooled apparatus and both of the water source and the sewer, the valving member having a second position in which the water inlet and the water outlet of the water-cooled apparatus are respectively fluidly connected to the water source and to the sewer through the single valve body and in which fluid communication between the water-cooled apparatus and the reservoir is blocked.