Patent ID: 11879553
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A steam valve comprising:
a valve body having a steam flow path through which steam flows, and a valve seat that is provided in the middle of the steam flow path and has an opening portion, and
a stop valve having a valve rod that extends in an axis direction in which an axis extends and is movable forward and backward in the axis direction, a slave valve that is provided at a tip of the valve rod in a tip portion of the valve rod, and a main valve that includes a penetrating portion, into which a portion located closer to a base end side of the valve rod than the tip is inserted, in the tip portion of the valve rod, closes the steam flow path by abutting against the valve seat, and is formed with a through-hole into which the steam flows when the slave valve is opened,
wherein the main valve functions as a valve seat of the slave valve, is not fixed to the valve rod, and is configured to be movable forward and backward in the axis direction,
a first inclined surface is formed on the tip portion of the valve rod so that an outer diameter of the valve rod is increased from a tip side of the valve rod toward the base end side of the valve rod,
a second inclined surface that is inclined at the same inclination angle as the first inclined surface is formed inside a portion of the main valve located on the base end side of the valve rod,
the first inclined surface and the second inclined surface are separated from each other in a state in which the slave valve and the main valve are closed,
the first inclined surface and the second inclined surface abut against each other when the slave valve and the main valve are in a fully opened state,
the first inclined surface includes two pairs of first inclined planar portions and four curved surfaces, that is disposed with the axis interposed therebetween, and
the second inclined surface has two pairs of second inclined planar portions that abut against the two pairs of the first inclined planar portions when the slave valve and the main valve are in a fully opened state.