Patent ID: 6220604
Filing Date: 2001-04-24
Classification: F16J

Abstract:
A system used in a stuffing box having packing rings for preventing concentric rings forming a throat bushing from misalignment when installed in said stuffing box at the bottom thereof for preventing inflow of abrasive materials, comprising:a self-adjusting interlocking throat bushing positioned between the bottom of said stuffing box and a packing ring;a pair of concentric rings each having plannar sides, one of said rings having an annular periphery carrying a V-shaped ridge projecting into the annulus of the ring, the other of said rings having an asymmetrical V-shaped annular groove adapted to receive said ridge upon assembly, the planes of the sides of said rings being offset, upon compression by said gland the sides of said ring coming into alignment as the rings slide towards each other, the loose sliding fit permitting relative movement of said rings during compression to establish alignment and maintaining said one ring interlockingly connected to said other ring such that upon mounting of said throat bushing at the bottom of said stuffing box and tightening of the gland thereof, the rings adjust to prevent packing extrusion, with the coaction of the V-shaped ridge and groove preventing the rings from coming apart.