Tractrix valve

摘要

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.