| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steam valve that can be applied to pressurization and high temperature heating of steam, since strength of a cast material used conventionally for a valve casing is insufficient to reduction of an allowable load and increase of a load that are influence on a threaded hole part accompanying the pressurization and the high temperature heating of the steam to make the application difficult. <P>SOLUTION: This steam valve 90 includes: a valve casing 11 storing a valve incorporation object, and produced by use of a cast material; and an upper lid 12 closing an upper opening part 91 of the valve casing 11 by upper lid installation bolts 20. The steam valve 90 includes: a valve casing flange part 51 formed in the upper face of the valve casing; the upper lid installation bolts 20 penetrating the valve casing flange part 51 and the upper lid 12; and cap nuts 61 screwed on the upper lid installation bolts 20. <P>COPYRIGHT: (C)2012,JPO&INPIT |
