Patent ID: 8627893

Claim:
An apparatus for controlling a fluid flow, the apparatus comprising: a body having a fluid conduit, a first flow line in fluid communication with the fluid conduit, and a second flow line; a rod configured to translate in the body, the rod having a flow passage in fluid communication with the second flow line and selective communication with the fluid conduit, wherein the rod has an end positioned outside of the body; a first and second sleeve members disposed in the body, each sleeve member having a bore in communication with the fluid conduit; a disk member selectively blocking flow across the fluid conduit, wherein the disk member is disposed in the rod and between the first and second sleeve members, and wherein the disk member includes: a shaft having a longitudinal axis; a sealing member disposed on the shaft; a flange formed on the shaft; a first ring member in contact with the flange, the first ring member having a pressure applying surface in contact with the sealing member, wherein the pressure applying surface is non-orthogonal to the longitudinal axis; and a second ring member disposed on the shaft, the sealing member being positioned between the second ring member and the pressure applying surface; and an actuator operably coupled to the disk member using the rod.