IPC Main Group
E21B 34/00 Valve arrangements for boreholes or wells
Introduced: January 1980
Last revised: January 2006
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
3 direct subcodes
Child Classifications
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- E21B 34/02 in well heads
- E21B 34/06 in wells
- E21B 34/16 Control means therefor being outside the borehole