| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F15 | USK | ENGINEERING IN GENERAL |
| F15 | KL | FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL |
| F15D | UKL | FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS (fluid-circuit elements F15C) |
| F15D 1/00 | HGR | Influencing the flow of fluids [1, 2006.01] |
| F15D 1/02 | UGR1 | | . | in pipes or conduits [1, 2006.01] |
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| F15D 1/04 | UGR2 | | . . | Arrangements of guide vanes in pipe elbows or duct bends; Construction of pipe conduit elements or elbows with respect to flow, specially for reducing losses of flow [1, 2006.01] |
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| F15D 1/06 | UGR2 | | . . | by influencing the boundary layer [1, 2006.01] |
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| F15D 1/08 | UGR1 | | . | of jets leaving an orifice (nozzles or outlets with means for mechanically breaking-up or deflecting the jet B05B, e.g. B05B 1/26) [1, 2006.01] |
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| F15D 1/10 | UGR1 | | . | around bodies of solid material [1, 2006.01] |
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| F15D 1/12 | UGR2 | | . . | by influencing the boundary layer [1, 2006.01] |
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| F15D 1/14 | UGR1 | | . | Diverting flow into alternative channels (in hydraulic engineering E02B) [1, 2006.01] |
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