Patent ID: 7380768

Claim:
A seal assembly for a control valve wherein the valve comprises a valve body, a valve bonnet, and a valve cage, the seal assembly comprising: an annular seal placed between the valve cage and the valve bonnet, the annular seal having in combination an elastic region, a compression surface, and at least one sealing surface wherein the valve cage has a channel adjacent to the valve bonnet for receiving the annular seal; and the valve bonnet having a shoulder to engage the compression surface of the seal to deform the elastic region of the seal to place the sealing surface of the seal in contact with at least one of the valve bonnet or the valve cage to form a fluid seal, wherein the unloaded annular seal is comprised of a hollow truncated cone having a first edge proximate the shoulder and defined by a first diameter and a second edge defined by a second diameter wherein the compression surface is associated with the first edge, the sealing surface is associated with the second edge, and the elastic region is interposed between the first edge and the second edge.