Patent ID: 6367805
Filing Date: 2002-04-09
Classification: F16J

Abstract:
A combination of a stripping bushing which defines a drain opening and a front wall having a circular opening therein and an inner face which is flat; a reciprocating member which extends through said circular opening of said front wall to define an annular liquid inlet gap therebetween; and stripping apparatus for preventing liquid from passing through said stripping bushing with reciprocation of said reciprocating member, said stripping apparatus including a stripping ring located in said stripping casing and positioned around said reciprocating member for transferring liquid from said reciprocating member to said drain opening, and a disc-shaped choke ring located within said stripping casing adjacent said front wall, said choke ring defining a front annular face which is flat and extends in parallel with said inner face of said front wall and adheres to the inner face of the front wall due to adhesive forces of said liquid to reduce flow of liquid through said annular gap with reciprocating movement of said reciprocating member, said choke ring having a smaller inner diameter than said opening in said front wall of said stripping bushing.