Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for

Introduced: September 1968

Of 9 combined children, 7 exist in both systems.

2 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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F01D 21/003 CPC only CPC only
F01D 21/006 CPC only CPC only
F01D 21/02 Shutting-down responsive to overspeed IPC+CPC Available in IPC and CPC
F01D 21/04 responsive to undesired position of rotor relative to stator , e.g. indicating such position +1 CPC IPC+CPC Available in IPC and CPC
F01D 21/10 responsive to unwanted deposits on blades, in working-fluid conduits or the like IPC+CPC Available in IPC and CPC
F01D 21/12 responsive to temperature IPC+CPC Available in IPC and CPC
F01D 21/14 responsive to other specific conditions IPC+CPC Available in IPC and CPC
F01D 21/16 Trip gear IPC+CPC Available in IPC and CPC
F01D 21/20 Checking operation of shut-down devices IPC+CPC Available in IPC and CPC