Liquid circuit

A liquid circuit comprising a liquid storage vessel, a liquid pump, a consumer device, a filter element having an unfiltered liquid side and a filtered liquid side, and a controller with a temperature detection unit for determining the temperature of a liquid in the liquid circuit;

• said controller comprising a valve, responsive to the temperature of the liquid, for returning excess liquid not needed by the consumer device at least partially to the filter element;
• wherein said filter element and said controller are integrated into a common liquid filter system comprising a housing having an unfiltered liquid inlet communicating with the unfiltered liquid side of the filter element, a filtered liquid outlet communicating with the filtered liquid side of the filter element, a liquid return which communicates with the controller, and a liquid outlet which communicates with the controller;
• said liquid storage vessel being connected to the unfiltered liquid inlet by an unfiltered liquid line;
• said filtered liquid outlet being connected to the consumer device by a filtered liquid line;
• said consumer device being connected to the liquid return by a liquid return line, and said liquid outlet being connected to the storage vessel by a liquid drain line;
• wherein the controller is connected by a connection line to the unfiltered side of the filter element, and the temperature detection unit is arranged between the liquid storage vessel and the consumer device.