Patent ID: 8720858

Claim:
A diaphragm valve ( 1 ) having a valve body ( 4 ) comprising: an inlet ( 5 ) and an outlet ( 6 ), a sealing membrane ( 7 ), and a connecting piece ( 11 ) connecting the sealing membrane ( 7 ) to a pressure piece ( 21 ) of drive ( 3 ), wherein the valve body ( 4 ), the sealing membrane ( 7 ) and the connecting piece ( 11 ) are rigidly connected together to form an interchangeable, sealed valve body unit ( 2 ) connectable to the drive ( 3 ), wherein the valve body unit ( 2 ) is for one time use and disposable, wherein the connecting piece ( 11 ) is molded on the sealing membrane ( 7 ), and wherein the valve body ( 4 ) and the sealing membrane ( 7 ) are welded ultrasonically to one another, wherein a diameter of the connecting piece ( 11 ) is larger than a width of a valve seat ( 8 ) formed between the inlet ( 5 ) and the outlet ( 6 ), wherein the sealing membrane ( 7 ) is designed to be convex along an entire interface with the connecting piece ( 11 ), and the valve body ( 4 ) is designed to be correspondingly concave in a corresponding area; wherein on the drive side a pressure-transmitting diaphragm ( 22 ) oriented towards the sealing membrane ( 7 ) is located in front of the pressure piece ( 21 ), said pressure-transmitting diaphragm being in contact with the sealing membrane ( 7 ) when the valve body unit ( 2 ) is attached to the drive ( 3 ); and wherein the connecting piece passes through to the other side of the diaphragm where the connecting piece connects to the pressure piece.