| 摘要 |
A valve system 10 comprises a valve 12 positioned in a conduit 14 of a power generation system for inhibiting gas flow 16 through the conduit, and a device 20 for moving the valve 12 in either direction between its closed and open conditions. The device 20 comprises an electro-mechanical actuator 21 which may be a ball-screw, a part of which is connected to the valve 12 and is linearly movable by an electric motor 25 to open or close the valve 12.
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