| 摘要 |
A portion at which a steam passage opens to a slide surface of a fixed side valve plate and a movable side valve plate of a rotary valve is reinforced with a reinforcing member having chipping resistance and abrasion resistance. Therefore, it can be prevented that an edge portion of the opening of the steam passage is chipped due to pulsation or the like of the pressure of high-temperature high-pressure steam supplied thereto and a resultant fragment damages the slide surface, or that abrasion dust generated from the slide surface damages the edge portion of the opening of the steam passage. Thus, the high-temperature high-pressure steam is prevented from short-cutting from the high-pressure side to the low-pressure side via the damage of the slide surface, and the supply timing of the high-temperature high-pressure steam is prevented from being upset, thus inhibiting the reduction in efficiency of an expander.
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