CPC Subgroup
E21B 34/06 in wells
Full Title
Valve arrangements for boreholes or wells > in wells
6 direct subcodes
Child Classifications
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- E21B 34/08 responsive to flow or pressure of the fluid obtained (E21B34/10 takes precedence)
- E21B 34/10 operated by control fluid supplied from outside the borehole
- E21B 34/12 operated by movement of casings or tubings
- E21B 34/14 operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools