Coal, coal slurry, coal ash, cinder, coal cinder water silicon, aluminum silica, alumina catalyst
Coke tar, asphalt titanium ore, gold ore, nickel ore titanium dioxide
Limestone sulfate sand, stone tail ore
Concrete exhaust all kinds of block materials, powder, paste, oil shale
Disc valve have SD, DD, LD, LB, TW, DV and LN seven basic series, all of the series is designed for switching applications, generally is not used to adjust, each disc valve type has its unique applications.

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