Abstract: Disclosed is a filter device (10), particularly a liquid filter, comprising a filter element (16) that is disposed in a filter housing (12, 14) and a heater (28) for heating medium flowing through the filter device (10). The inventive filter device (10) is characterized in that the heater (28) is designed with at least one heating circuit (30) that is molded into the filter housing (12, 14). Alternatively or additionally, the heater (28) is designed with at least one heating circuit (30) which is provided with an electrical contact (34) in at least one of the final zones thereof, said electrical contact (34) being riveted to the heating circuit (28).

Abstract: A metering device for introducing liquid reducing agent into an exhaust gas pipe. A metering valve is supplied with contents from a working tank by a delivery unit and dispenses the tank contents in a discharge direction. The delivery unit establishes a negative pressure between the delivery unit and the metering valve when the delivery direction is reversed. The negative pressure causes gas to be drawn off through the metering valve against the discharge direction. The delivery direction is reversed by either a feed pump with a reversible effective direction or a feed pump and a repolarization valve which communicates with the feed pump and transposes an inlet and an outlet of the feed pump.

Abstract: A metering valve assembly having a metering valve for metering an aqueous urea solution for posttreatment of exhaust gases from internal combustion engines, the liquid being capable of being fed in a feeding direction to the metering valve and a mixing chamber being provided, in which the liquid is miscible with a gas in a gas flow. The metering valve is evacuatable contrary to the feeding direction.

Abstract: The invention relates to a metering device for introducing liquid reducing agent into an exhaust gas pipe. The metering device has a working tank with contents, a delivery unit which is connected to the working tank and the delivery direction of which can be reversed, and a metering valve which is connected to the delivery unit. The metering valve is supplied with contents by the delivery unit and is designed to dispense the tank contents in a discharge direction. The metering valve is designed and connected to the delivery unit in such a way that the delivery unit establishes a negative pressure between the delivery unit and the metering valve when the delivery direction is reversed. The negative pressure causes gas to be drawn off through the metering valve against the discharge direction. The invention also relates to a method for operating a metering device for introducing liquid reducing agent into an exhaust gas tract.

Abstract: Disclosed is a filter device (10), particularly a liquid filter, comprising a filter element (16) that is disposed in a filter housing (12, 14) and a heater (28) for heating medium flowing through the filter device (10). The inventive filter device (10) is characterized in that the heater (28) is designed with at least one heating circuit (30) that is molded into the filter housing (12, 14). Alternatively or additionally, the heater (28) is designed with at least one heating circuit (30) which is provided with an electrical contact (34) in at least one of the final zones thereof, said electrical contact (34) being riveted to the heating circuit (28).

Abstract: A metering valve assembly having a metering valve for metering an aqueous urea solution for posttreatment of exhaust gases from internal combustion engines, the liquid being capable of being fed in a feeding direction to the metering valve and a mixing chamber being provided, in which the liquid is miscible with a gas in a gas flow. The metering valve is evacuatable contrary to the feeding direction.

Abstract: A method for mutual adaptation of a delivery module and a metering module of an exhaust emissions control system that has an exhaust gas conduit and a control module, the delivery module having a reservoir that has a venting valve and contains a uric acid solution that is conveyed via a delivery pump to a pressure regulating valve; and in the metering module, an air stream being compressed with the aid of a pump, conveyed to a pressure accumulator, and conveyed via a regulating valve, together with the uric acid solution, out of the pressure regulating valve to a metering valve, and being conveyed from there to an atomizer unit disposed in the exhaust gas conduit, the value of a reference pressure based on the pressure forming in the exhaust gas conduit being stored in the control module.