Abstract: A new, unique combination of the tractrix valve and the tractrix stem seal is described as an improvement over the original patents issued. The plug and the stem seal are juxtaposed large end to large end. The stem seal functions as a fluid seal and as a journal bearing. The purpose of the tractrix valve is to prevent leaks through the seat of the valve and to the outside environment past the stem seal by use of long-term self-renewing tractrix surfaces that continue to mate after continued use.

Abstract: The preferred embodiment comprising a truncated cone valve plug, or a truncated cone with curved sides as in the tractrix valve is described. A step is fabricated into the large end of the valve plug. A secondary seal, called a Veri-Seal, is placed on the large end of the valve plug on the step at an intermediate location between the outer diameter of the plug and the stem. Pressure forces acting downward on the step on the top of the valve plug balance the pressure forces acting upward in the channel through the valve plug. By placing the Veri-Seal at this intermediate location on the top of the plug, the spring force can be minimized and the resulting torque to open and close the valve is consequently reduced.

Abstract: A new, unique combination of the Tractrix Valve and the Tractrix Stem Seal is described as an improvement over the original patents issued. The plug and the stem seal are juxtaposed large end to large end. The stem seal functions as a fluid seal and as a journal bearing. The purpose of the Tractrix Valve is to prevent leaks through the seat of the valve and to the outside environment past the stem seal by use of long-term self-renewing tractrix surfaces that continue to mate after continued use.