Patent ID: 7513758
Filing Date: 2009-04-07
Classification: F04B,F16L,Y10S

Abstract:
1. A pipe seal for an abrasive materials pump, comprising: a core base ring formed of a first material selected for strength and fracture toughness, the base ring having a first side and an opposing second side and having at least one aperture extending from the first side to the second side; a plurality of tiles of a first size formed of a second material secured to the base core ring along a radial surface of the aperture; a plurality of tiles of a second size formed of a third material and secured to the first side of the base core ring at a first radial distance from the center of the aperture; a plurality of tiles of additional sizes formed of a fourth material and secured to the first side of the base core ring at a second radial distance from the center of the aperture; wherein the fourth material is harder than the first material; wherein the second material is harder than the fourth material; and wherein the third material is harder than the second material.