F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F01 MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
F01L CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
F01L1/00 Valve-gear or valve arrangements, e.g. lift-valve gear
F01L1/26 characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
F01L1/267 with means for varying the timing or the lift of the valves