Page 2 of 5 Many steam turbine valve manufacturers are using
advanced materials for the manufacture of valve components, such
as stellite bushings and incoloy stems, which are much stronger
and oxidation resistant. Typical valve manufacturers include
General Electric (GE), Westinghouse, Toshiba and Allis Chalmers.
The control mechanisms for valve movement such as Digital
Electro Hydraulic Control (D-EHC) via Electro Hydraulic Control
(EHC) oil supply to the valve actuator are now very reliable for
steam turbine valve control. The steam turbine valve remains the
most important link in preventing overspeed events for the
modern turbine generator. In this paper, a real life example
will be presented with an in-depth discussion of turbine valve
maintenance. A case study for valve inspection The TS Power
Plant located in Northeastern Nevada began operations in June
2008 and underwent its first valve inspection after two and half
years in 2010. The plant has a gross power output of 242 MW at
full load and the desig