Patent ID: 7481058

Claim:
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.