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What do these letter codes in the turbine drain system mean?

2019-08-08View Original

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What do E22 and E20 marked in the diagram, as well as Kh4 within the rectangle, mean? Please, fellow Sichuanese, help answer this
Reply #22019-08-08
E22 labyrinth seal drain, E20 high-pressure cylinder drain, Kh4 low-pressure cylinder drain

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