Patent ID: 7234491

Claim:
A device for damping water hammer in hydraulic accumulators formed as a component thereof, comprising: a valve housing mountable in an accumulator housing, said valve housing having a fluid inlet connectable to an accumulator interior and an outlet end connectable to an accumulator connection to a hydraulic network; a valve component configured as a valve piston movably mounted in said valve housing between a first position providing a throttle in fluid flow between said fluid inlet and said outlet end and a second position essentially releasing that fluid flow, said valve component having a central channel, said central channel having at least one transfer area of a specified cross section and a first funnel-shaped enlargement at a first end of said central channel opening in a direction of one of said fluid inlet and said outlet end; web extensions on one end of said valve piston; cylindrical guide surfaces in said valve housing slidably receiving and guiding an outer circumferential surface of said valve component; a first level sealing surface on an end of said valve component facing said fluid inlet and engaging a level contact surface on said valve housing surrounding said fluid inlet in said first position; and a second level sealing surface on said valve component adjoining said web extensions.