G - Physics – 08 – B
Patent
G - Physics
08
B
340/124, 354/21
G08B 21/00 (2006.01) F01D 17/26 (2006.01) F01D 21/00 (2006.01) F01K 7/34 (2006.01) F01K 7/38 (2006.01) F16K 15/18 (2006.01) G01M 3/18 (2006.01) G01M 3/36 (2006.01)
Patent
CA 2034844
ABSTRACT OF THE DISCLOSURE 53,735 The diagnostic system evaluates the operation of a non-return (NR) valve in a steam extraction line of a steam turbine. The NR valve is connected in a steam flow path in series with an isolation valve between the turbine and a feedwater heater. The NR valve includes a flapper which is pivotable on a shaft for selectively blocking ,reverse flow through the NR valve. A counterweight is attached to the shaft external of the valve for balancing the weight of the flapper, and a power assist servo-motor is coupled to the shaft for providing an initial assist to rotation of the shaft to start the flapper in a closing direction. The system includes a first sensor coupled to the shaft supporting the flapper to provide first signals representative of shaft angular position. A second sensor is coupled to the isolation valve for providing second signals representative of the desired state of the isolation valve. A computer is coupled for receiving first and second signals and includes timing means for determining the rate of change of the shaft angular position upon receipt of the second signals. The computer further includes a means for comparing the shaft position to predetermined shaft positions corresponding to states of the second signals, and for comparing the rate of change for identifying variations in response to characteristics of the NR valve. A status report is provided by the computer to indicate the state of the operability of the NR valve.
Barton Serge Peter
Berrong David Bruce
Bereskin & Parr
Westinghouse Electric Corporation
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