Patent ID: 7784279

Claim:
A steam valve comprising: a valve casing; a valve seat secured to the valve casing; a main valve body axially slidable to abut to or to detach from the valve seat; a bypass valve body axially slidably disposed in the main valve body, the bypass valve body having a steam passage therein and an annular wall that axially protrudes out of the main valve body when the bypass valve body is in a full open position, the annular wall having a plurality of steam inlet ports configured such that steam enters the steam passage through the steam inlet ports; a cylindrical flow guide surrounding the annular wall, the flow guide secured to a top of the main valve body and configured to guide steam flowing from outside of the flow guide to a space positioned between the annular wall and the flow guide; and a strainer surrounding the main valve body and the flow guide, the strainer being secured to the valve casing, wherein a cylindrical wall of the flow guide includes a plurality of steam paths configured to incline toward a peripheral direction of the flow guide so as to generate swirl flow between the flow guide and the annular wall.