Steam valve

#This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2014-071306, filed on Mar. 31, 2014; the entire contents of which are incorporated herein by reference.

#Embodiments described herein relate generally relate to a steam valve.

#In a steam turbine system, steam valves such as a steam stop valve, a steam control valve are provided at a pipe. In the steam turbine system, a flow rate and so on of steam transferred from a boiler to a steam turbine is adjusted by the steam valves such as the steam control valve.

#FIG. 1 is a sectional view illustrating a part of a steam control valve in a first embodiment.

#FIG. 2 is a sectional view illustrating a part of a steam control valve in a second embodiment.

#FIG. 3 is a sectional view illustrating a part of a steam control valve in a third embodiment.

#A steam valve according to an embodiment includes a casing, a valve rod, a valve element, and a valve seat. At the casing, the steam flows from an inlet into an inner space, and flows out of an outlet. The valve rod is accommodated in the inner space of the casing. The valve element is coupled to the valve rod at the inner space of the casing. The valve seat is fixed to the casing at the inner space of the casing, and includes a part where the valve element is in contact by moving together with the valve rod along an axis of the valve rod. Each of the valve seat and the casing includes a plane facing via a gap at a downstream side than a part where the valve seat and the valve element are in contact at the inner space. The valve seat has a cover part which covers the gap at the inner space.

#Embodiments are described with reference to the drawings.

#FIG. 1 is a sectional view illustrating a part of a steam control valve in a first embodiment. In FIG. 1, a part where a valve seat is mounted on a casing is enlargedly illustrated at the steam control valve V2 as same as FIG. 11.