Patent ID: 11952864
Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. An isolation valve comprising:
a ball section having a ball valve element rotatable between an open position and a closed position;
an actuation section coupled with the ball section to rotate the ball valve element; and
a trigger section that actuates the actuation section, and thus the ball section, in response to a pressure differential,
wherein the actuation section comprises:
an actuation mandrel comprising an upper actuation mandrel coupled to a lower actuation mandrel;
a piston housing that at least partially encases the actuation mandrel, wherein the piston housing and the actuation mandrel define a hydraulic chamber between an inner diameter of the piston housing and an outer diameter of the actuation mandrel;
a collet piston disposed in the piston housing, the collet piston separating the hydraulic chamber into an upper hydraulic chamber and a lower hydraulic chamber; and
a holding collet disposed in the piston housing that supports the collet piston during a stroke of the actuation mandrel that is triggered by the trigger section,
wherein the collet piston is configured to assume a rest position on the actuation mandrel before and during the stroke of the actuation mandrel that is triggered by the trigger section, and
wherein the collet piston is configured to disengage from the actuation mandrel after the stroke of the actuation mandrel that is triggered by the trigger section.