Larry C Jacobs

US Patent:

8011667, Sep 6, 2011

Filed:

Oct 29, 2008

Appl. No.:

12/290268

Inventors:

Jason C. Ferris - Kalamazoo MI, US
Larry E. Jacobs - Kalamazoo MI, US
Steven D. DeSmit - Kalamazoo MI, US
Daryl L. Griffith - Three Rivers MI, US
Anne L. Saad - Kalamazoo MI, US

Assignee:

Flowserve Management Company - Irving TX

International Classification:

F16J 15/34

US Classification:

277371, 277408

Abstract:

A mechanical seal face has a significant increase in the ability of the seal to tolerate poor lubrication conditions such as dry running. The mechanical seal employs a thin, non-corrugated flat sheet of flexible thermally conductive graphite material placed between one of the mechanical seal faces and a metal surface such as a metal surface defined by a shaft sleeve or gland serving as a seal ring holder. The graphite sheet is located axially between a back face of the more thermally conductive mechanical seal ring and the metal face holder part. The conductive seal face material preferably is a ceramic or cermet material such as silicon carbide, tungsten carbide, silicon nitride, aluminum oxide, or a metallic material such as stainless steel. Fluid pressure and spring forces are used to create a compressive load between the seal face, graphite sheet, and metal part to maximize continuous contact between the opposed faces of these parts and the opposite sides of the graphite sheet, and heat buildup at contacting seal faces flows away therefrom to the metal part through the thermally conductive sheet.

US Patent:

20140232069, Aug 21, 2014

Filed:

Feb 13, 2014

Appl. No.:

14/179863

Inventors:

- Irving TX, US
Larry E. Jacobs - Kalamazoo MI, US

International Classification:

F16J 15/34

US Classification:

277365

Abstract:

An O-ring balance shift mechanism is provided in a dry lift-off face mechanical seal to maintain necessary hydraulic closing forces on the seal faces when pressurized from either the inside or outside diameter of the balance shift mechanism to shift the diameter balance of the seal rings radially under reversed pressure conditions. This mechanism includes a shift ring with two O-rings wherein the shift ring is H-shaped or S-shaped in two alternate embodiments. The O-rings are radially spaced from each other and move axially with the shift ring during reverse pressure conditions.