Control valve test in cam controlled valve system

Details Control valve test in cam controlled valve system Control valve test in cam controlled valve system

1983-05-26

1985-02-19

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

60660, G01M 1500

Patent

active

044997566

ABSTRACT:
A test apparatus and method tests for closure of ganged, cam operated main control valves in a steam turbine. Cam actuation of a set of upper main control valves is separated from cam actuation of a lower set of main control valves. A test controller actuates one of the sets of main control valves in the opening or closing direction and holds the other set stationary while monitoring turbine power output. When the power output has changed by a predetermined amount, the test controller halts actuation of the first-actuated set of main control valves and begins actuating the other set of main control valves in the opposite direction until the turbine power output has changed a predetermined amount in the opposite direction. The process of incrementally closing one set while incrementally opening the other set of main control valves is continued until the set of main control valves being moved in the closing direction should be fully closed. The amount of steam being fed to the opened set of main control valves indicates whether the closed set of main control valves are, in fact, closed. The test may be continued in the opposite direction by adjusting the previously open main control valves incrementally until they should be fully closed and, between increments of actuation of these main control valves, adjusting the previously closed main control valves in the opening direction until the set being closed should be, in fact, closed.

REFERENCES:
patent: 3928977 (1975-12-01), Braytenbah et al.
patent: 4059960 (1977-11-01), Osborne
patent: 4088875 (1978-05-01), Podolsky et al.
patent: 4203297 (1980-05-01), Sakai et al.

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