Patent ID: 6854519

Claim:
A subsurface safety valve system, comprising: a) a tubular body having a borehole formed therethrough; b) a valve member pivotably coupled to the tubular body to selectively close the borehole of the subsurface safety valve; c) a tubular member at least partially disposed in the borehole and slidably coupled with the tubular body, the tubular member adapted to selectively displace the valve member in the borehole; d) the safety valve further having a chamber formed therein with at least one chamber wall, the chamber coupled to the borehole; e) an actuator slidably mounted within the chamber to establish a stroke and coupled to the tubular member in the borehole, the actuator having at least one spherical engagement portion; and f) a leading, annular, line contact surface disposed in the chamber, the line contact surface facing the at least one spherical actuator engagement portion and adapted to seat against the at least one spherical engagement portion at a selected portion of the actuator stroke.