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After many years of operation, steam chests and valves start to suffer from lifetime expiry, thermal cycling damage, and the interaction of creep and fatigue. These problems may be compounded by demands for more flexible operation. Older valve designs may also feature less than optimal flow paths and poor control precision.GE has a wealth of experience in upgrading valves on many fleets and machine types. The most common way to achieve these benefits is to upgrade the parts to proven, modern designs. These can be adapted to the geometry, layout, and interfacing systems of the unit under consideration.