Patent ID: 7383854

Claim:
A solenoid valve for fluid media comprising: a valve housing having a valve chamber that communicates with an inlet via an inlet conduit and communicates with an outlet via an outlet conduit and valve seat; a solenoid system disposed on the valve housing and having a solenoid coil with solenoid armature, an end of which is attached to a valve disk by means of a valve stem that extends through the valve chamber; and a diaphragm that provides a seal between the valve chamber and interior of the solenoid system, the diaphragm having an inner edge and an outer edge, the inner edge being fixed on the valve stem or the valve disk, and the outer edge being fixed on the valve housing, wherein the diaphragm is fixed at a location on its outer edge to the valve housing at a mouth of the inlet conduit where it enters the valve chamber, so that an inner surface of the diaphragm that is disposed in the valve chamber extends from the outer edge in a basically uniform downward curve to the inner edge at the valve stem or valve disk, wherein at least when the valve is in a closed position with the valve disk in a sealing relationship with the valve seat, all portions of said surface of the diaphragm are disposed below the outer edge, further wherein a recess is provided in the valve chamber for collecting calcification particles by providing a floor in the region around the valve seat that is lower than the valve seat and the mouth of the inlet conduit.