Pump comprising a shield valve controlled by the conveying medium

Abstract

A pump is provided having at least one shield valve controlled by the conveyed medium and having a valve disk ( 4 ) of flexible material which is clamped in a central region and is movable between an open and a closed position, in which closed position the valve disk ( 4 ) closes at least one valve opening ( 9 ). The pump according to the invention includes extensions ( 11 ) that project from the valve disk ( 4 ) and/or on a valve abutment surface ( 10 ) arranged on a side remote from the valve opening ( 9 ), for avoiding a sudden flat abutment of the valve disk ( 4 ) on the valve abutment surface and/or for limiting the valve opening movement. The pump according to the invention is distinguished by a particularly low noise operation.

1 . Pump ( 1 ) comprising at least one shield valve controlled by a conveyed medium and having a valve disk ( 4 ) of flexible material, which is clamped in a central region and is movable between an open position and a closed position, in said closed position the valve disk ( 4 ) closes at least one valve opening ( 9 ), wherein extensions ( 11 ) project from the valve disk ( 4 ) and/or on a valve abutment surface ( 10 ) arranged on a side thereof remote from the valve opening ( 9 ), for preventing a sudden flat abutment of the valve disk on the valve abutment surface and/or for limiting valve opening motion.  
   
   
       2 . Pump according to  claim 1 , wherein the extensions ( 11 ) provided on the valve disk ( 4 ) project in step form from a peripheral edge of the valve disk ( 4 ) and act on a region of the shield valve surrounding the valve abutment surface ( 10 ).  
   
   
       3 . Pump according to  claim 1  or  2 , wherein the valve disk ( 4 ) has the plurality of extensions ( 11 ) projecting generally uniformly from the peripheral edge of the disk.  
   
   
       4 . Pump according to one of claims  1 - 3 , wherein the valve abutment surface ( 10 ) has an approximately conical shape.  
   
   
       5 . Pump according to one of claims  1 - 4 , wherein a central region of the valve disk ( 4 ) is centered by a pin ( 7 ) which passes through a central perforation ( 8 ) of the valve disk ( 4 ).  
   
   
       6 . Pump according to one of claims  1 - 5 , wherein the valve disk ( 4 ) is connected by at least one of the step-shaped extensions ( 11 ) with a sealing ring ( 13 ) surrounding the valve disk ( 4 ), the sealing ring ( 13 ) is clamped between two housing portions ( 5 ,  6 ).  
   
   
       7 . Pump according to one of claims  1 - 6 , wherein the at least one extension ( 11 ) connecting the valve disk ( 4 ) and the sealing ring ( 13 ) extends at least sectionally transversely to the disk radius and runs in a spiral form.  
   
   
       8 . Pump according to one of claims  1 - 7 , wherein at least one gap ( 14 ) acting as a passage opening is provided between the sealing ring ( 13 ) and the valve disk ( 4 ).