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A positioning device for an air valve arranged in the charging air line of a diesel engine, particularly charged by means of a pressure wave-charging device. The air valve or flap is provided with a shutoff valve incorporated into the flow path between an impingement line branching-off from a pressu

A positioning device for an air valve arranged in the charging air line of a diesel engine, particularly charged by means of a pressure wave-charging device. The air valve or flap is provided with a shutoff valve incorporated into the flow path between an impingement line branching-off from a pressure oil line of the diesel engine and an oil return flow line. The impingement line is connected with an impingement chamber for a positioning piston actuating the air valve or flap. The positioning piston is loaded by a continuously effective force and the shutoff valve is actuated, in order to impinge the positioning piston with oil, in the opening direction of the air valve or flap by a control piston loaded by the pressure in the air charging line against the force of a spring. The shutoff valve interposed between the impingement chamber and the oil return flow line, in the presence of an oil pressure for impinging the positioning piston with pressurized oil, is moved by the charging air pressure in the charging air line out of its open position into its closed position, and the closed shutoff valve, only in the absence of oil pressure for oil pressure relief of the positioning piston, can be controlled by the spring force from its closed position into the open position.

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A positioning device for an air flap valve arranged in the charging air line of a diesel engine, comprising: a shutoff valve provided for the air flap valve; said shutoff valve being incorporated into a flow path between an impingement line branching-off from a pressure oil line of the diesel engine

A positioning device for an air flap valve arranged in the charging air line of a diesel engine, comprising: a shutoff valve provided for the air flap valve; said shutoff valve being incorporated into a flow path between an impingement line branching-off from a pressure oil line of the diesel engine and an oil return flow line; an impingement chamber with which there is connected said impingement line; a positioning piston arranged within said impingement chamber and serving to actuate the air flap valve; means defining a continuously effective force for loading said positioning piston; said shutoff valve including a control piston; said shutoff valve being actuatable by means of said control piston in order to impinge the positioning piston with oil in the opening direction of the air flap valve; a spring acting upon said control piston; said control piston being loaded by the pressure prevailing in the charging air line against the force of said spring; said shutoff valve being interposed between the impingement chamber and the oil return flow line; said shutoff valve in the presence of oil pressure for impinging the positioning piston with pressurized oil, being moved by the charging air pressure in the charging air line out of its open position into its closed position; and said closed shutoff valve, only with an absence of oil pressure being controlled by the spring force of the spring from its closed position into its open position, in order to relieve the positioning piston from the action of the oil pressure.