IPC Subgroup
F16K 21/04 Self-closing valves, i.e. closing automatically after operation
Introduced: September 1968
Last revised: January 2006
Full Title
Fluid-delivery valves > Self-closing valves, i.e. closing automatically after operation
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- Subclass:
- VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
4 direct subcodes
Child Classifications
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- F16K 21/06 in which the closing movement, either retarded or not, starts immediately after opening
- F16K 21/14 with special means for preventing the self-closing
- F16K 21/16 closing after a predetermined quantity of fluid has been delivered
- F16K 21/18 closed when a rising liquid reaches a predetermined level