Control valve

Abstract

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 spaces ( 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 ).

1 . A control valve for controlling an overflow of a medium from a first pressure space into a second pressure space having a pressure differing from a pressure in the first pressure space, with a valve body prestressed against a valve seat, with a control device for moving the valve body and with a movable pressure compensating element which is subjected to the pressure difference between the pressure spaces and is connected to the valve body and which is intended for compensating the pressure forces acting on the valve body, wherein the pressure spaces ( 1 ,  2 ) are sealed off relative to one another in the region of the pressure compensating element ( 8 ,  17 ,  26 ).  
     
     
         2 . The control valve as claimed in    claim 1   , wherein the pressure compensating element ( 8 ,  17 ,  26 ) has a diaphragm ( 9 ,  20 ,  30 ) for separating the pressure spaces ( 1 ,  2 ).  
     
     
         3 . The control valve as claimed in    claim 1    or    2   , wherein a valve shaft ( 7 ,  18 ,  23 ) designed for adjusting the valve body ( 5 ,  16 ,  24 ) is connected to a disk ( 10 ,  19 ,  29 ) holding the diaphragm ( 9 ,  20 ,  30 ).  
     
     
         4 . The control valve as claimed in at least one of the preceding claims, wherein the pressure compensating element ( 8 ) is designed to subdivide a container ( 12 ) into two chambers ( 13 ,  14 ), and the first chamber ( 13 ) is connected to the first pressure space ( 1 ) and the second chamber ( 14 ) to the second pressure space ( 2 ).  
     
     
         5 . The control valve as claimed in at least one of the preceding claims, wherein the container ( 12 ) is arranged on that side of the first pressure space ( 1 )