Patent ID: 11891879
Assignee: PRAGMA WELL TECHNOLOGY LIMITED
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A downhole valve for location in a tubular, the downhole valve comprising:
a housing;
a flow path between a valve inlet and a valve outlet;
at least one valve mechanism; and
at least one piston member;
wherein:
the at least one valve mechanism is operable by actuation of the at least one piston member to selectively open and close the flow path between the valve inlet and valve outlet;
the at least one piston member is actuatable to selectively open and close the flow path between the valve inlet and valve outlet by a pressure differential between an annulus pressure at the valve and a pressure at the valve outlet, and
the annulus is defined between the valve and the tubular in which the valve is located.