Patent ID: 8794268

Claim:
A hydraulic dump system for a turbine trip-and-throttle valve, comprising: a housing defining first and second flowpaths therein; an inlet coupled to the housing and fluidly coupled to a source of a fluid and to the first and second flowpaths; a first outlet coupled to the housing and selectively coupled to the first and second flowpaths; a second outlet coupled to the housing and selectively coupled to the first and second flowpaths; and first, second, and third control valves received in the housing and intersecting the first and second flowpaths, the first, second, and third control valves each being movable between a tripped position and an untripped position, wherein, when the first, second, and third control valves are in the untripped position, fluid is routed to the first outlet via the first and second flowpaths and blocked from flowing to the second outlet, when one of the first, second, and third control valves is in the tripped position, fluid in the second flowpath is diverted to the first flowpath and the second flowpath is blocked such that fluid flows to the first outlet and is blocked from flowing to the second outlet, and when at least two of the first, second, and third control valves are in the tripped position, fluid is blocked from flowing to the first outlet and flows to the second outlet.