Check valve damping

Abstract

The present invention relates to a check valve unit () having a shaft bearing body () with an at least substantially cylindrical mounting portion () extending along an axial direction (A) and an axially extending valve shaft () mounted therein. The latter is displaceable along the axial direction (A). The check valve unit () further includes a valve head () with a sealing surface (), wherein the valve head () is disposed on a distal end () of the valve shaft () in the axial direction (A), the distal end () facing away from the mounting portion (). Further, a damping reservoir () is provided inside the shaft bearing body (). A volume of the damping reservoir () is changed by axial movement of the valve shaft (). In order to obtain a well-defined times for opening and closing under given conditions and to make the check valve unit () less prone to making noise, at least two channels () are provided in parallel, each of them constituting a fluid connection between the damping reservoir () and an outside (). The damping reservoir () is, apart from the channels (), at least substantially enclosed. Each channel () has a length being at least ten times a hydraulic diameter of the respective channel ().