Patent ID: 6167902
Filing Date: 2001-01-02
Classification: F16K,Y10T

Abstract:
New and improved Bottom Entry Cryogenic Valve comprising: a) a single piece cast body, with no brazing or weldments, having an outer surface and an inner surface, said inner surface forming a housing having a top end, a main body section and a bottom entry end, the top end having a diameter that is smaller than the diameter of the bottom entry end, the main body section having a fluid entry opening and a fluid exit opening; b) a removable stem bushing sized and shaped to fit within the said single piece cast body bottom entry end having a cavity with a threaded surface facing toward the said single piece body inner surface; c) a valve stem having a top portion, a mid portion, a flange portion and a threaded bottom end, said valve stem mid portion having threads on a portion, said valve stem being supported partially within the single piece cast body with the valve stem top portion extending from the single piece cast body top end, and the valve stem mid portion, valve stem flange portion and valve stem threaded bottom end located within the single piece cast body main body section, said valve stem threaded bottom end being threadedly received within said removable stem bushing cavity that permits actuation from a first or open position to a second or closed position; d) a seal nut/bearing formed in the shape of an elongated tubular member, being a cylinder having an internal surface and an outer surface, the internal surface has two portions, a top portion and a bottom or nut portion, the seal nut/bearing top portion having a diameter that is sized and shaped to permit the valve stem to support the seal nut/bearing securely, the seal nut/bearing bottom or nut portion having threads with a diameter that is greater than the diameter of the seal nut/bearing top portion, the threads are sized and shaped to engage frictionally with the threads on the valve stem mid portion, the seal nut/bearing outer surface has four sections, a top bearing section, a mid sleeve section, a nut section and a flange section, the valve nut/bearing outer surface is sized and shaped to fit within the single piece cast body main body section making contact, and yet permitting movement; and e) a valve seal member sized and shaped to be supported on the valve stem mid portion below the seal nut/bearing and above the valve stem flange portion, and also sized and shaped to not engage the single piece cast body inner surface when the valve stem is in a first or open position and to engage the single piece cast body inner surface when the valve stem is in a second or closed position.