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:
Sep. 14, 1993
Filed:
Sep. 16, 1992
Alain Hassan, Paris, FR;
Jacques Pajot, Lamorlaye, FR;
GEC Alsthom SA, Paris, FR;
Abstract
A device for causing a drop in the pressure of high pressure oil controlling admission valves of a steam turbine in the event of excess speed, the device comprising a speed trip (2) constrained to rotate with the shaft (1) of the turbine and fed downstream from a constriction (5) with low pressure oil from the low pressure lubricating oil circuit of the turbine, the device being characterized in that it comprises a hydraulically controlled valve (9) having a hollow body (23) containing a closing valve member (24) for closing a discharge orifice (12) connected to said high pressure oil circuit, said closing valve member (24) being connected to a plate (25) dividing in sealed manner the inside of the body of the hydraulically controlled valve (9) into two compartments, a 'first' one (11) of said compartments being situated on the same side as said discharge orifice (12) and also including at least one evacuation orifice (37), and the 'second', other one of the compartments (8) being fed downstream via a feed orifice (7) from a constriction (5) with oil from said low pressure oil circuit, said second compartment (8) being also connected without constriction to said speed trip (2), and in that the moving equipment (10) constituted by said closing valve member (24) and said plate (25) is guided axially by guide means (27, 28, 29), said moving equipment also being subjected to a resilient force (33) tending to move said valve member (2) away from the discharge orifice (12).