# US 10,480,662 B2 · Steam valve and steam turbine system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,662 B2 - Document ID: US10480662B2 - Status: Granted - Kind: B2 - Application number: 15/770,372 - Filed: 2016-10-21 - Published: 2018-09-06 - Granted: 2019-11-19 - Earliest claimed: 2015-10-30 - Assignees: Mitsubishi Hitachi Power Systems, Ltd. - Applicants: Mitsubishi Hitachi Power Systems, Ltd. - Inventors: Kensuke Futahashi; Hiroyuki Kanazawa; Kengo Imaoka; Katsuhisa Hamada - Web page: https://patentgrep.com/patent/US10480662B2 ## CPC - F01D 17/145: {by means of valves, e.g. for steam turbines (valves in general F16K)} - F16K 1/443: {the seats being in series} - F01D 17/10: Final actuators (valves in general F16K {; blades with variable camber F01D5/148}) - F01D 25/00: Component parts, details, or accessories, not provided for in, or of interest apart from, other groups - F16K 1/32: Details (details of more general applicability F16K25/00 - F16K51/00) - F16K 1/42: Valve seats (for double-seat valves F16K1/44) - F16K 1/44: Details of seats or valve members of double-seat valves - F16K 27/02: of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) - F16K 47/02: for preventing water-hammer or noise - F05D 2220/31: in steam turbines - Y10T 137/87917: Flow path with serial valves and/or closures - 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)} - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A steam valve includes a valve casing, a first valve body having a first cylindrical part and a first end wall part, a second valve body having a second cylindrical part and a second end wall part, a first valve stem capable of vertically biasing the first valve body, a second valve stem capable of vertically biasing the second valve body, a flow guide disposed inside the first cylindrical part and having a projection configured to project downwardly from the first cylindrical part and the second cylindrical part when the first cylindrical part and the second cylindrical part are apart from the valve seat, and a support supporting the flow guide. The support extends from the valve casing or the second valve body to the flow guide through a through hole formed in the first valve body to support the flow guide such that the flow guide is tiltable. ## Claims ### Claim 1 A steam valve comprising: a valve casing including: a valve chamber; an inlet flow passage opening to the valve chamber; an outlet flow passage opening to the valve chamber; and a valve seat surrounding an opening of the outlet flow passage; a first valve body accommodated in the valve chamber, the first valve body including: a first cylindrical part having a first end vertically abuttable on the valve seat; and a first end wall part formed integrally with a second end side of the first cylindrical part; a second valve body accommodated in the valve chamber, the second valve body including: a second cylindrical part coaxially disposed with respect to the first cylindrical part and having a first end vertically abuttable on the valve seat at an outer position than the first cylindrical part; and a second end wall part formed integrally with a second end side of the second cylindrical part; a first valve stem capable of vertically biasing the first valve body; a second valve stem capable of vertically biasing the second valve body; a flow guide disposed inside the first cylindrical part, the flow guide having a projection configured to project downwardly from the first cylindrical part and the second cylindrical part when the first cylindrical part and the second cylindrical part are apart from the valve seat; and a support which supports the flow guide, the support extending from the valve casing or the second valve body to the flow guide through a through hole formed in the first valve body to support the flow guide such that the flow guide is tiltable with respect to the valve casing or the second valve body. ### Claim 2 (depends on 1) The steam valve according to claim 1, wherein the support has rigidity allowing the flow guide to tilt with respect to the valve casing or the second valve body. ### Claim 3 (depends on 1) The steam valve according to claim 1, wherein the flow guide has a spherical seat allowing the flow guide to tilt with respect to the second valve body. ### Claim 4 (depends on 1) The steam valve according to claim 1, wherein the support comprises at least one rod penetrating the first cylindrical part in a radial direction of the first cylindrical part and extending between the second cylindrical part and the flow guide. ### Claim 5 (depends on 1) The steam valve according to claim 1, wherein the support comprises at least one rod penetrating the first end wall part and vertically extending between the second end wall part and the flow guide. ### Claim 6 (depends on 1) The steam valve according to claim 1, further comprising a plurality of vanes each mounted to the valve casing and arranged around the valve seat, wherein at least one of the plurality of vanes forms a part of the support, and the support extends between the valve casing and the flow guide via the at least one vane. ### Claim 7 (depends on 1) The steam valve according to claim 1, further comprising: a second-valve-body pressure equalization mechanism capable of connecting an upper space surrounded by the second cylindrical part between the first end wall part and the second end wall part to a space outside the second cylindrical part; and a first-valve-body pressure equalization mechanism capable of connecting a lower space surrounded by the first cylindrical part between the first end wall part and the projection to the upper space, wherein the flow guide has a pressure equalization hole penetrating the projection and connecting the outlet flow passage to the lower space. ### Claim 8 (depends on 1) A steam turbine system comprising: the steam valve according to claim 1; and a steam turbine configured to be supplied with steam from the steam valve.