Impact device between two parts which are movable with respect to each other, e.g. a valve device

摘要

The arrangement has at least two movable parts (1,2). The two parts are designed to impact on each other, and there is an adaptation which comprises an impact surface (3,4) on each part. At least one of the impact surfaces has a plastics coating which is thin wrt the movable part as a whole. The plastics material is preferably polytetrafluoroethylene (PTFE).