CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES

Introduced: September 1968

Description

F01L encompasses cyclically operating valves that control fluid flow in reciprocating or rotary machines and engines through periodic opening and closing actions synchronized with machine operation. This subclass includes intake and exhaust valves for internal combustion engines, steam engine valves, and analogous valve mechanisms in compressors and pumps. The classification covers valve actuating mechanisms, timing systems, and related hardware designed for timed, repetitive operation rather than continuous modulation. Related valve technologies for non-cyclic applications are classified elsewhere, such as in F16K for general valve construction.

Of 34 combined children, 18 exist in both systems.

16 codes are CPC-only extensions.

Note: 16 CPC extensions are marked as secondary classification only.

14 shared codes have differing titles between IPC and CPC.

Child Classifications

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F01L 1/00 Valve-gear or valve arrangements, e.g. lift-valve gear (lift-valve and valve-seat assemblies per se F01L3/00; slide-valve gear F01L5/00; actuated non-mechanically F01L9/00; valve arrangements in working piston or piston rod F01L11/00; modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations F01L13/00) IPC+CPC Available in IPC and CPC
F01L 11/00 Valve arrangements in working piston or piston-rod IPC+CPC Available in IPC and CPC
F01L 13/00 Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations +4 CPC IPC+CPC Available in IPC and CPC
F01L 15/00 Valve-gear or valve arrangements, e.g. with reciprocatory slide valves, other than provided for in groups F01L17/00 - F01L29/00 (valve drive or external valve-adjustment during operation, tripping-gear or tripping of valves F01L31/00) IPC+CPC Available in IPC and CPC
F01L 17/00 Slide valve-gear or valve arrangements with cylindrical, sleeve, or part annularly-shaped valves surrounding working cylinder or piston IPC+CPC Available in IPC and CPC
F01L 19/00 Slide valve-gear or valve arrangements with reciprocatory and other movement of same valve, other than provided for in F01L17/00, e.g. longitudinally of working cylinder and in cross direction IPC+CPC Available in IPC and CPC
F01L 21/00 Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting elements, e.g. in free-piston machines IPC+CPC Available in IPC and CPC
F01L 2201/00 Electronic control systems; Apparatus or methods therefor 2nd only CPC only CPC only
F01L 2250/00 Camshaft drives characterised by their transmission means 2nd only +3 CPC CPC only CPC only
F01L 23/00 Valves controlled by impact by piston, e.g. in free-piston machines IPC+CPC Available in IPC and CPC
F01L 2301/00 Using particular materials 2nd only +1 CPC CPC only CPC only
F01L 2303/00 Manufacturing of components used in valve arrangements 2nd only +2 CPC CPC only CPC only
F01L 2305/00 Valve arrangements comprising rollers 2nd only +1 CPC CPC only CPC only
F01L 2307/00 Preventing the rotation of tappets 2nd only CPC only CPC only
F01L 2309/00 Self-contained lash adjusters 2nd only CPC only CPC only
F01L 2311/00 Differential gears located between crankshafts and camshafts for varying the timing of valves 2nd only CPC only CPC only
F01L 2313/00 Rotary valve drives 2nd only CPC only CPC only
F01L 25/00 Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means IPC+CPC Available in IPC and CPC
F01L 27/00 Distribution or expansion valve-gear peculiar to free-piston machines or engines and not provided for in F01L21/00 - F01L25/00 IPC+CPC Available in IPC and CPC
F01L 2710/00 Control of valve gear, speed or power 2nd only +2 CPC CPC only CPC only