Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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F01L
CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
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25/00
Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
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F01L25/04
by working-fluid of machine or engine, e.g. free-piston machine
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F01L25/06
Arrangements with main and auxiliary valves, at least one of them being fluid-driven
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