Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Koichi Nagaishi

Yuichi Nakamura

Toshihiko Endo

Hisashi Goto

Takuhiro Tsunekawa

A steam turbine valve drive apparatus in an embodiment includes a piston, a cylinder, a bidirectional pump, a servo motor, and a quick closing mechanism. The cylinder houses the piston in an inner space thereof, the inner space being partitioned by the piston into a first hydraulic chamber and a second hydraulic chamber. The quick closing mechanism executes a quick closing operation of closing the steam valve unit more quickly than the closing operation. Here, the quick closing mechanism executes the quick closing operation by feeding the working oil accumulated in an accumulator to the second hydraulic chamber and draining the working oil from the first hydraulic chamber.

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Yokohama, Japan

Koichi Nagaishi