| US 7,481,058 B2 | ||
| High temperature steam valve and steam turbine plant | ||
| Masafumi Fukuda, Saitama (Japan); Hideo Hosaka, Kawasaki (Japan); and Tsutomu Ooishi, Yokohama (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Sep. 08, 2005, as Appl. No. 11/220,984. | ||
| Claims priority of application No. 2004-260587 (JP), filed on Sep. 08, 2004. | ||
| Prior Publication US 2006/0048513 A1, Mar. 09, 2006 | ||
| Int. Cl. F01K 13/00 (2006.01) | ||
| U.S. Cl. 60—645 [60/670] | 6 Claims |
| 1. A high temperature steam valve comprising:
a valve casing having a main steam inlet, a main steam outlet and a valve chest located therein;
a valve seat positioned in the valve chest;
a valve element facing the valve seat; and
a valve rod slidably penetrating the valve casing to drive the valve element, wherein
a cooling steam passage is provided in such a manner as to surround a valve-rod penetrating portion of the valve casing, cooling
steam being fed from outside into the cooling steam passage, and the cooling steam being exhausted toward the valve rod in
the valve chest through the cooling steam passage,
wherein the cooling steam passage comprises:
a cooling steam inlet hole for introducing the cooling steam from outside;
a cooling steam manifold communicating with the cooling steam inlet hole and formed so as to surround the valve-rod penetrating
portion;
a plurality of cooling steam holes branching off from the cooling steam manifold and being formed in parallel with the valve-rod
penetrating portion; and
a cooling steam exhaust hole running off steam having passed the cooling steam holes into the valve chest.
|