Abstract: A temperature-control apparatus for a printing machine includes a closed, temperature-control fluid circuit including a pump with a suction and pressure side, a fluid feed line feeding temperature-control fluid from a fluid source to the suction side of the pump and a fluid return line on the suction side of the pump between the pump and the load. Temperature-control fluid from the source may be pumped by the pump through the circuit to the load and recycled to the suction side of the pump. A valve is provided in the return line to the source and is controlled by a temperature sensor that senses the temperature in the circuit and selectively directs fluid to the circuit or out of the circuit and back to the source dependent upon the sensed temperature.

Abstract: A temperature-control apparatus for a printing machine: a closed, temperature-control fluid circuit including a pump with a suction and pressure side, a fluid feed line feeding temperature-controlled fluid from a fluid source to the suction side of the pump and a fluid return line between the pressure side of the pump and the load. Temperature-control fluid from the source is pumped by the pump through the fluid circuit to the load and is recycled to the suction side of the pump. A valve is connected between the pressure side of the pump and a return line to the source and is controlled by a temperature sensor that senses the temperature in the circuit and selectively directs fluid from the source through the circuit or out of the circuit and back to the source dependent upon the sensed temperature in the circuit. There may be a heater in the circuit.