A pressure compensating element (8) for a control valve (3) for controlling an overflow of a medium from a first pressure space (1) into a second pressure space (2) has a diaphragm (9) separating the pressure space (1, 2) from one another. The pressure compensating element (8) compensates forces act
A pressure compensating element (8) for a control valve (3) for controlling an overflow of a medium from a first pressure space (1) into a second pressure space (2) has a diaphragm (9) separating the pressure space (1, 2) from one another. The pressure compensating element (8) compensates forces acting on a valve body (5) of the control valve (3) and generated by pressure differences in the pressure spaces (1, 2). However, an overflow of a medium from one pressure space (1) into the other pressure space (2) takes place solely in the region of the control valve (3).
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1. A control valve for a motor vehicle for controlling an overflow of an exhaust-gas from an exhaust duct into an intake duct having a pressure differing from a pressure in the exhaust duct comprising a valve body prestressed against a valve seat, a control device for moving the valve body, and a mo
1. A control valve for a motor vehicle for controlling an overflow of an exhaust-gas from an exhaust duct into an intake duct having a pressure differing from a pressure in the exhaust duct comprising a valve body prestressed against a valve seat, a control device for moving the valve body, and a movable pressure compensating element which is subjected to pressure difference between the ducts and is connected to the valve body, said pressure compensating element has essentially the same cross-sectional area as the valve body and said pressure compensating element equalizing pressure between the ducts thereby compensating for the pressure forces acting on the valve body, wherein the ducts (1, 2) are sealed off relative to one another in a region of the pressure compensating element (8, 17, 26) and whereby the valve body can be raised with minimal force by the control device, wherein a part of the exhaust duct is surrounded by the intake duct having a C-shaped cross section, the valve body and the pressure compensating element each of which is arranged in one of the legs of the intake duct, the pressure compensating element (17) has a disc (19) fastened to valve shaft (18) and a diaphragm (20) fastened to the disc (19), the valve body (16) fastened to the valve shaft (18) and prestressed against the valve seat (21). 2. The control valve as claimed in claim 1, wherein said pressure compensating element (8, 17, 26) has said diaphragm (9, 20, 30) for separating the ducts (1, 2). 3. The control valve as claimed in claim 2, wherein said valve shaft (7, 18, 23) for adjusting the valve body (5, 16, 24) is connected to said disk (10, 19, 29) holding the diaphragm (9, 20, 30). 4. The control valve as claimed in claim 1, further comprising a container, wherein the pressure compensating element subdivides said container (12) into first and second chambers (13, 14), said first chamber (13) is connected to the exhaust duct (1) and said second chamber (14) is connected to the intake duct (2). 5. The control valve as claimed in claim 4, wherein the container (12) is positioned on a side of the exhaust duct (1) opposite the intake duct (2), and a pressure compensating duct (15) connects the intake duct (2) to the second chamber (14). 6. The control valve as claimed in claim 1, wherein the valve body (5) is returnable into a closing position by a spring element (11). 7. The control valve as claimed in claim 1, wherein the exhaust duct is parallel to the intake duct.
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