Rotary Valve with Angled Wings

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A rotary valve, controlling liquid or gas flow through connected pipes, operates via a transverse plug's rotation within passages. The basic stopcock is an example. Rotary valves have diverse uses such as brass instrument pitch adjustment, steam and exhaust control in steam engines (e.g., Corliss), open hearth furnace air and fuel flow reversal, chromatography sample loading, two-stroke engine types, and hydraulic automotive power steering control.