Patent ID: 9528344
Filing Date: 2016-12-27
CPC Classification: E21B

Claim Text:
1. A safety valve configured for being disposed in a wellbore through a fluid-producing formation, the safety valve comprising: a piston assembly controllable from a surface of the wellbore; a flow tube; a closing assembly for allowing and preventing fluid flow through an end of the flow tube; and a connecting assembly positioned between the flow tube and the piston assembly, the connecting assembly being configured to allow the flow tube to move toward the surface of the wellbore in response to a closing force exerted on the flow tube by the closing assembly and at least partially independent of movement toward the surface of the wellbore by at least part of the piston assembly; wherein the connecting assembly comprises a ring that is removably coupled to the flow tube, the ring comprising a first longitudinal end configured to couple with the piston assembly and a second longitudinal end configured to couple with a power spring, the first longitudinal end having a first diameter and a second longitudinal end having a second diameter larger than the first diameter, the second longitudinal end defining a boundary of a chamber configured to receive part of the flow tube as the flow tube moves toward the surface of the wellbore in response to the closing force, wherein a take-up spring is disposed in the chamber, the take-up spring being normally biased away from the surface of the wellbore.