Patent ID: 11920432
Assignee: DOWNHOLE PRODUCTS LIMITED
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 19:
20. A toe valve for use in a wellbore, comprising:
a tubular mandrel;
a housing extending along a periphery of the mandrel;
couplings at longitudinal ends of the toe valve for assembly as part of a casing or liner string;
a valve piston disposed in an annulus formed between the housing and the mandrel, movable between an open position and a closed position, disposed between a valve port of the housing and a valve port of the mandrel in the closed position, and having a face in fluid communication with a bore of the mandrel;
a hydraulic activator disposed in a wall of the housing for locking the valve piston in the closed position in a first mode and for releasing the valve piston in a second mode;
hydraulic fluid disposed in the annulus between the valve piston and the hydraulic activator; and
an atmospheric chamber in fluid communication with the hydraulic activator.