The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 01, 1991
Filed:
Jun. 05, 1990
Abraham Lipschitz, Warwick, RI (US);
EG&G Sealol, Inc., Wellesley, MA (US);
Abstract
A hydrostatic seal includes a high pressure cavity in one of two opposed sealing faces between a shaft and housing for supplying a pressurized barrier fluid between the opposed sealing faces, and an arrangement for preventing passage of the barrier fluid into the interior of the housing and for preventing the passage of machine fluid from the housing into the high pressure cavity. The arrangement includes a first circumferential dam for providing a narrow gap between the high pressure cavity and the interior of the housing and a system for maintaining the pressure of the barrier fluid in the high pressure cavity substantially equal to the pressure of the machine fluid in the housing. A discharge cavity is provided in one of the sealing faces for discharging barrier fluid from between the opposed barrier faces and preventing barrier fluid from leaking between the housing and the shaft to the ambient. A second circumferential dam is positioned between the high pressure cavity and the discharge cavity, and a third circumferential dam is positioned between the discharge cavity and the ambient.