| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F15 | USK | ENGINEERING IN GENERAL |
| F15 | KL | FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL |
| F15C | UKL | FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES (transducers F15B 5/00; fluid dynamics in general F15D; computers comprising fluid elements G06D , G06G) |
| F15C 1/00 | HGR | Circuit elements having no moving parts |
| F15C 1/02 | UGR1 | |
| F15C 1/04 | UGR2 | | . . | Means for controlling fluid streams to fluid devices, e.g. by electric signals |
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| F15C 1/06 | UGR2 | | . . | Constructional details; Selection of specified materials |
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| F15C 1/08 | UGR1 | | . | Boundary-layer devices, e.g. wall-attachment amplifiers [2] |
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| F15C 1/10 | UGR2 | | . . | for digital operation, e.g. to form a logical flip-flop, OR-gate, NOR-gate |
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| F15C 1/12 | UGR3 | | . . . | Multiple arrangements thereof for performing operations of the same kind, e.g. majority gates, identity gates |
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| F15C 1/14 | UGR1 | | . | Stream-interaction devices; Momentum-exchange devices, e.g. operating by exchange between two orthogonal fluid jets |
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| F15C 1/16 | UGR1 | | . | Vortex devices, i.e. devices in which use is made of the pressure drop associated with vortex motion in a fluid |
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| F15C 1/18 | UGR1 | | . | Turbulence devices, i.e. devices in which a controlling stream will cause a laminar flow to become turbulent |
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| F15C 1/20 | UGR1 | | . | Direct-impact devices, i.e. devices in which two collinear opposing power streams are impacted |
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| F15C 1/22 | UGR1 | |
| F15C 3/00 | HGR | Circuit elements having moving parts (valves, construction of valves F16K) |
| F15C 3/02 | UGR1 | |
| F15C 3/04 | UGR1 | | . | using diaphragms (connection of valves to inflatable elastic bodies B60C 29/00) |
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| F15C 3/06 | UGR1 | |
| F15C 3/08 | UGR1 | |
| F15C 3/10 | UGR1 | | . | using nozzles or jet pipes |
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| F15C 3/12 | UGR2 | | . . | the nozzle or jet pipe being movable |
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| F15C 3/14 | UGR2 | | . . | the jet from the nozzle being intercepted by a flap |
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| F15C 3/16 | UGR1 | |
| F15C 4/00 | HGR | Circuit elements characterised by their special functions |
| F15C 5/00 | HGR | Manufacture of fluid-circuit elements; Manufacture of assemblages of such elements |
| F15C 7/00 | HGR | Hybrid elements, i.e. circuit elements having features according to groups F15C 1/00 and F15C 3/00 [2] |