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:
Jul. 28, 1992
Filed:
Jul. 15, 1991
Joseph D Hurley, Casselberry, FL (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A system is provided for independently testing trip valves in a multi-valve electro-hydraulic trip control system for a steam turbine. The electro-hydraulic trip control system features first and second channels arranged in series to control the pressure of a hydraulic fluid supplied to the actuator of the steam turbine throttle valve. Each of the channels has first and second trip valves arranged in parallel. First and second orifices are arranged in parallel with the first and second channels, respectively. First and second pressure switches are adapted to sense the pressure in the hydraulic fluid downstream of the first orifice. A programmable controller is programmed to test each of trip valves individually by individually opening and closing each of the trip valves sequentially and determining whether the signals from the pressure switches indicate that the trip valve being tested has opened. The programmable controller is programmed to indicate a valve failure should one of the trip valves fail to open.