Balanced-plug cage style control valve and bonnet seal assembly

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 annular seal is comprised of a hollow truncated cone having a first diameter and a second diameter wherein the compression surface is circumscribed by the first diameter, the sealing surface is circumscribed by the second diameter, and the elastic region is formed by a third surface interposed between the first and second diameters.

A fluid control valve comprising:

• a valve body having a fluid inlet, a fluid outlet, and a fluid passageway for communicating between the fluid inlet and the fluid outlet, and a valve seat in the
• fluid passageway for controlling the fluid flow;
• a valve bonnet mounted to the valve body and defining a central longitudinal axis;
• a movable operator protruding through the valve bonnet for engaging the valve seat along the longitudinal axis;
• a valve seal comprising an annular seal including an elastic region, a compression surface, and at least one sealing surface;
• a valve cage mounted inside the valve body, the valve cage having a channel adjacent to the valve bonnet for receiving the valve seal wherein a force applied to the compression surface by the valve bonnet deforms the elastic region creating a spring force to place the sealing surface in contact with at least one of the valve bonnet or the valve cage to form a fluid seal,
• wherein the annular seal is comprised of a hollow truncated cone having a first diameter and a second diameter wherein the compression surface is circumscribed by the first diameter, the sealing surface is circumscribed by the second diameter, and the elastic region is formed by a third surface interposed between the first and second diameters.