| 摘要 |
PURPOSE:To make it possible to use a steam valve under the condition of steam having a higher pressure and a higher temperature, by forming the splines of a valve rod and a main valve in vertically two-stepped structures so that the shoulder parts of teeth of these two-stepped splines are simultaneously contacted together when the valve rod is pulled up. CONSTITUTION:The splines 13, 13' of a main valve 1 and a valve rod 4 are formed in vertically two-stepped structures so that the shoulder parts of teeth of the two-stepped splines are simultaneously contacted together when the valve rod 4 is pulled up. With this arrangement, the pressure between the contacted surfaces of the shoulder parts of the spline teeth may be made small upon initiation of the opening of main valve 1, and therefore, the strength of the splines may be increased, thereby the steam valve may be satisfactorily used under the condition of high pressure and high temperature. |
