Patent ID: 6131612
Filing Date: 2000-10-17
Classification: F16K,F22G,Y10T

Abstract:
A steam valve for a superheated steam conversion station, the steam valve comprising:a casing formed witha port having a high-pressure side and a low-pressure side and formed therebetween with an annular valve seat,an annular draw-off chamber adjacent the valve seat and opening radially inward into the port immediately adjacent the seat on the low-pressure side, anda draw-off passage extending from the draw-off chamber and opening into the low-pressure side downstream from the draw-off chamber;a closure member displaceable in the casing betweena fully closed position directly engaging the valve seat, blocking flow past the seat and through the port, and substantially closing the draw-off chamber,a partially closed position out of engagement with the valve seat, partially blocking the port and thereby permitting only restricted partial flow past the seat and through the port, and unblocking the draw-off chamber for restricted partial flow between the high-pressure side of the port and the draw-off chamber, anda fully open position out of engagement with the valve seat and completely unblocking the port for free flow past the seat and through the port; andmeans on the casing for moving the closure member between its positions.