Patent ID: 6302136
Filing Date: 2001-10-16
Classification: F16K,F16T,Y10T

Abstract:
A steam valve comprising:a conduit comprising a first opening, a second opening, and a steam fluid passageway therethrough for flow of steam fluid between said openings, said steam fluid passageway including a valve seat that includes a valve seat mating surface; anda valve plug including a major surface which includes a valve plug mating surface, said valve plug being moveable relative to said valve seat between at least a first position and a second position;wherein in said first position said mating surfaces cooperate to substantially prevent flow of steam fluid through said steam fluid passageway from said first opening to said second opening, and wherein in said second position said mating surfaces are spaced at a distance from each other to allow steam fluid to flow from said first opening to said second opening through said steam fluid passageway, and wherein said valve seat mating surface has a metal nitride coating thereon.