Patent ID: 6655409
Filing Date: 2003-12-02
Classification: F01D,F05D,F16K,Y10T

Abstract:
A valve for supplying steam to downstream machinery, comprising:a generally annular valve seat defining a steam flow passage; a control valve in said passage including a control valve head having a recess on a downstream side of said control valve, said control valve head being movable toward and away from said valve seat between closed and open positions, respectively; a stop valve having a stop valve head generally within said recess and a sealing surface for engagement with said valve seat in a stop valve closed position downstream of said control valve closed position; an outlet passage below said valve seat and in communication with an outlet for directing the supply of steam to the machinery, said outlet passage having a cross-sectional area not substantially larger than the cross-sectional area of the valve seat and said outlet, said outlet passage and said valve seat having walls forming a smooth continuous transition therebetween without abrupt changes in flow direction for directing supplied steam past said seat, through said outlet passage and to said outlet generally in a laminar flow condition substantially without formation of vortices to afford optimum steam flow characteristics with minimum losses.