Steam valve and power generation system

Abstract

A steam valve with a valve body that includes a flow path partition part that partitions a steam flow path through which steam flows; and a valve seat provided halfway through the steam flow path and having an opening part. The steam valve is provided with a stop valve, which includes a valve rod extending in an axial direction in which an axial line extends, and capable of advancing and retracting in the axial direction. The stop valve includes a child valve fixed to the tip-end of the valve rod in a tip-end part of the valve rod. The stop valve includes a parent valve that includes a penetration part into which a portion of the tip-end part of the valve rod positioned closer to the base end side of the valve rod than to the tip-end is inserted, closes the steam flow path when abutted on the valve seat.