Patent ID: 7252500
Filing Date: 2007-08-07
Classification: B29C

Abstract:
1. In a check valve assembly for an injection molding apparatus having a rotatably and axially translatable feed-screw within a barrel bore for moving a plasticized polymeric material through the valve assembly towards an exit chamber of the apparatus, the check valve assembly characterized by; (A) a body member having a first forward valve seat surface and a first rearward valve seat surface, and (B) an axially slideable valve member movable from a valve-opened position, allowing plasticized material to move through the valve, to a valve-closed position prohibiting any material from entering the valve, the slidable member having, (C) the valve seats and the outside diameter surface constituting frictional wear surfaces (D) the improvement comprising a plurality of cylindrical recesses extending into at least part of the valve seats, said recesses filled with abrasion resistant disks securely attached therein, said disks effectively reducing frictional wear between relatively co-acting frictional wear surfaces and between the surfaces and the plasticized material as it is moved through the check valve assembly.