# US 10,119,416 B2 · Main steam valve and steam turbine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,119,416 B2 - Document ID: US10119416B2 - Status: Granted - Kind: B2 - Application number: 15/517,784 - Filed: 2015-10-21 - Published: 2017-10-26 - Granted: 2018-11-06 - Earliest claimed: 2014-10-28 - Assignees: Mitsubishi Hitachi Power Systems, Ltd. - Applicants: Mitsubishi Hitachi Power Systems, Ltd. - Inventors: Tomoshige Takata; Katsuhisa Hamada; Kensuke Futahashi - Web page: https://patentgrep.com/patent/US10119416B2 ## CPC - F01D 25/10: Heating, e.g. warming-up before starting - F01D 17/085: {to temperature} - F01D 17/145: {by means of valves, e.g. for steam turbines (valves in general F16K)} - F16K 1/34: Cutting-off parts, e.g. valve members, seats (F16K1/06, F16K1/12, F16K1/14, F16K1/26 take precedence) - F16K 1/54: Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve - F16K 47/08: for decreasing pressure {or noise level} and having a throttling member separate from the closure member {, e.g. screens, slots, labyrinths} - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} ## Abstract A main steam valve includes a cylindrical guide centered about an O-axis, a valve body disposed inside the guide so as to be slidable in the O-axis direction, a valve shaft on which the valve body moves in the O-axis direction between open and closed positions, and a casing having a flow path and a valve seat formed on an inner surface thereof. The flow path guides out a fluid guided into the casing from the inflow direction along the O-axis direction. The valve body abuts against the valve seat when the valve body is in the closed position. A valve chamber, formed in the casing, has a baffle plate provided in a region between an outer circumferential surface of the guide and an inner surface of the casing. The baffle plate interrupts swirling vortex flow with spiral vortex core extending in the circumferential direction of the O-axis of the guide. ## Claims ### Claim 1 A main steam valve comprising: a cylindrical guide extending centered about an axis; a valve body disposed inside the guide so as to be slidable in an axis direction; a valve shaft on which the valve body moves in the axis direction between an open position and a closed position; a casing having a flow path formed therein and having a valve seat formed on an inner surface thereof, the flow path guiding out, in an outflow direction that intersects an inflow direction, a fluid guided into the casing from the inflow direction along the axis direction, the valve body abutting against the valve seat when the valve body is in the closed position; and a valve chamber formed inside the casing, the valve chamber having a baffle plate provided in a region between an outer circumferential surface of the guide and an inner surface of the casing, the baffle plate interrupting a swirling vortex flow with spiral vortex core that extends in a circumferential direction of the axis of the guide, wherein the baffle plate includes a first plate portion that extends in the outflow direction of the fluid in a region of the valve chamber that is between the outer circumferential surface of the guide and the inner surface of the casing and that is on an opposite side in the outflow direction of the fluid, an end portion of the first plate portion on an inner side in a radial direction forms a gap with the outer circumferential surface of the guide, and the end portion of the first plate portion on the inner side in the radial direction is inclined so as to be closer to the outer circumferential surface of the guide toward a deep side in the inflow direction. ### Claim 2 (depends on 1) A steam turbine comprising the main steam valve according to claim 1. ### Claim 3 (depends on 1) The main steam valve according to claim 1, wherein the baffle plate includes a second plate portion that extends in a direction orthogonal to the axis direction, in a width direction that intersects the inflow direction and the outflow direction of the fluid, in the region of the valve chamber between the outer circumferential surface of the guide and the inner surface of the casing. ### Claim 4 (depends on 3) The main steam valve according to claim 3, wherein the second plate portion includes at least one of a near-side plate portion formed only on a near side in the inflow direction of the fluid or a deep-side plate portion formed only on the deep side in the inflow direction of the fluid. ### Claim 5 (depends on 3) The main steam valve according to claim 3, wherein the second plate portion is provided at a position in the circumferential direction around the axis within a range from 45° to 130° with respect to a position at which the first plate portion is disposed. ### Claim 6 (depends on 3) The main steam valve according to claim 3, wherein the second plate portion is provided at a position in the circumferential direction around the axis within a range from 80° to 100° with respect to the position at which the first plate portion is disposed. ### Claim 7 (depends on 3) The main steam valve according to claim 3, wherein the second plate portion is provided at a position in the circumferential direction around the axis that is at 90° with respect to the position at which the first plate portion is disposed. ### Claim 8 (depends on 3) The main steam valve according to claim 3, wherein the second plate portion includes a near-side plate portion formed only on a near side in the inflow direction of the fluid and a deep-side plate portion formed only on the deep side in the inflow direction of the fluid, and the near-side plate portion is provided on one side in the circumferential direction of the axis with respect to a position at which the first plate portion is disposed, and the deep-side plate portion is provided on the other side in the circumferential direction of the axis with respect to the position at which the first plate portion is disposed. ### Claim 9 (depends on 8) The main steam valve according to claim 8, wherein positions of the near-side plate portion and the deep-side plate portion partially overlap with each other in the axis direction. ### Claim 10 A main steam valve comprising: a cylindrical guide extending centered about an axis; a valve body disposed inside the guide so as to be slidable in an axis direction; a valve shaft on which the valve body moves in the axis direction between an open position and a closed position; a casing having a flow path formed therein and having a valve seat formed on an inner surface thereof, the flow path guiding out, in an outflow direction that intersects an inflow direction, a fluid guided into the casing from the inflow direction along the axis direction, the valve body abutting against the valve seat when the valve body is in the closed position; and a valve chamber formed inside the casing, the valve chamber having a baffle plate provided in a region between an outer circumferential surface of the guide and an inner surface of the casing, the baffle plate interrupting a swirling vortex flow with spiral vortex core that extends in a circumferential direction of the axis of the guide, wherein the baffle plate includes a first plate portion that extends in the outflow direction of the fluid in a region of the valve chamber that is between the outer circumferential surface of the guide and the inner surface of the casing and that is on an opposite side in the outflow direction of the fluid, an end portion of the first plate portion on an inner side in a radial direction forms a gap with the outer circumferential surface of the guide, and the end portion of the first plate portion on the inner side in the radial direction is inclined so as to separate further away from the outer circumferential surface of the guide toward a deep side in the inflow direction. ### Claim 11 A main steam valve comprising: a cylindrical guide extending centered about an axis; a valve body disposed inside the guide so as to be slidable in an axis direction; a valve shaft on which the valve body moves in the axis direction between an open position and a closed position; a casing having a flow path formed therein and having a valve seat formed on an inner surface thereof, the flow path guiding out, in an outflow direction that intersects an inflow direction, a fluid guided into the casing from the inflow direction along the axis direction, the valve body abutting against the valve seat when the valve body is in the closed position; and a valve chamber formed inside the casing, the valve chamber having a baffle plate provided in a region between an outer circumferential surface of the guide and an inner surface of the casing, the baffle plate interrupting a swirling vortex flow with spiral vortex core that extends in a circumferential direction of the axis of the guide, wherein the baffle plate includes a first plate portion that extends in the outflow direction of the fluid in a region of the valve chamber that is between the outer circumferential surface of the guide and the inner surface of the casing and that is on an opposite side in the outflow direction of the fluid, the baffle plate includes a second plate portion that extends in a direction orthogonal to the axis direction, in a width direction that intersects the inflow direction and the outflow direction of the fluid, in the region of the valve chamber between the outer circumferential surface of the guide and the inner surface of the casing, the second plate portion includes a near-side plate portion formed only on a near side in the inflow direction of the fluid and a deep-side plate portion formed only on the deep side in the inflow direction of the fluid, the near-side plate portion is provided on one side in the circumferential direction of the axis with respect to a position at which the first plate portion is disposed, and the deep-side plate portion is provided on the other side in the circumferential direction of the axis with respect to the position at which the first plate portion is disposed, and positions of the near-side plate portion and the deep-side plate portion do not overlap with each other in the axis direction.