Patent ID: 6651957
Filing Date: 2003-11-25
Classification: F16K

Abstract:
A tractrix valve comprising:a tractrix valve plug with a tractrix flare, a valve stem with a tractrix flare, said valve stem being rigidly attached and concentric with said tractrix valve plug and where the tractrix flare of said valve stem is in the opposite direction to said tractrix valve plug; a tractrix valve body with a tractrix shape matching said tractrix valve plug inserting said tractrix valve plug into said tractrix valve body to form a tractrix plug/body interface; a bonnet, a plurality of bolts, attaching said bonnet to said tractrix valve body with said plurality of bolts; a stem seal with an internal tractrix shape and an external cylindrical shape inserting said stem seal onto said valve stem to form a mating tractrix stem/stem seal interface and a mating stem seal/bonnet interface; a retainer ring, a plurality of bolts with springs located under the bolts, attaching said retainer ring to said bonnet by means of said plurality of bolts with springs located under said plurality of bolts for the purpose of imposing an axial force to said retainer ring, said tractrix stem/stem seal interface, and said tractrix plug/body interface to create sealing pressures required to contain fluid in said tractrix plug valve.