# US 10,871,080 B2 · Steam turbine valve drive apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,080 B2 - Document ID: US10871080B2 - Status: Granted - Kind: B2 - Application number: 15/862,160 - Filed: 2018-01-04 - Published: 2018-08-02 - Granted: 2020-12-22 - Earliest claimed: 2017-01-31 - Assignees: Kabushiki Kaisha Toshiba; Toshiba Energy Systems & Solutions Corporation - Applicants: Kabushiki Kaisha Toshiba; Toshiba Energy Systems & Solutions Corporation - Inventors: Takuhiro Tsunekawa; Yuichi Nakamura; Koichi Nagaishi; Toshihiko Endo; Hisashi Goto - Web page: https://patentgrep.com/patent/US10871080B2 ## CPC - F01D 17/145: {by means of valves, e.g. for steam turbines (valves in general F16K)} - F01D 25/20: using lubrication pumps - F15B 1/022: {used as an emergency power source, e.g. in case of pump failure} - F15B 20/00: Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems - F16K 31/122: the fluid acting on a piston (F16K31/143, F16K31/163, F16K31/363, F16K31/383 take precedence) - F01K 7/16: the engines being only of turbine type (the engines using steam of critical or overcritical pressure F01K7/32; the engines being of extraction or non-condensing type F01K7/34) - F05D 2220/31: in steam turbines - F05D 2260/98: Lubrication - F15B 2211/205: Systems with pumps - F15B 2211/20515: Electric motor - F15B 2211/20561: reversible - F15B 2211/212: the pressure sources being accumulators - F15B 2211/27: Directional control by means of the pressure source - F15B 2211/61: Secondary circuits - F15B 2211/625: Accumulators - F15B 2211/7054: Having equal piston areas - F15B 2211/8755: Emergency shut-down - F15B 2211/88: Control measures for saving energy - F16N 23/00: Special adaptations of check valves (check valves in general F16K) - F16N 2013/063: {with electrical drive} - F16N 2210/02: Turbines - F16N 2280/02: electromagnetically operated - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR - 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)} - F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - F16N: LUBRICATING ## Abstract A steam turbine valve drive apparatus in an embodiment includes a piston, a cylinder, a bidirectional pump, a servo motor, and a quick closing mechanism. The cylinder houses the piston in an inner space thereof, the inner space being partitioned by the piston into a first hydraulic chamber and a second hydraulic chamber. The quick closing mechanism executes a quick closing operation of closing the steam valve unit more quickly than the closing operation. Here, the quick closing mechanism executes the quick closing operation by feeding the working oil accumulated in an accumulator to the second hydraulic chamber and draining the working oil from the first hydraulic chamber. ## Claims ### Claim 1 A steam turbine valve drive apparatus comprising: a piston provided at an operation rod that operates a steam valve installed in a flow passage for steam flowing to a steam turbine; a cylinder housing the piston in an inner space thereof, the inner space being partitioned by the piston into a first hydraulic chamber and a second hydraulic chamber; a bidirectional pump configured to execute an opening operation of the steam valve by feeding a working oil to the first hydraulic chamber and configured to execute a closing operation of the steam valve by feeding the working oil to the second hydraulic chamber; a servo motor configured to drive the bidirectional pump; and a quick closing mechanism configured to execute a quick closing operation of closing the steam valve more quickly than the closing operation, wherein the quick closing mechanism includes: a first dump valve arranged in a first quick closing oil passage configured to connect to the first hydraulic chamber, a second dump valve arranged in a second quick closing oil passage configured to connect to the second hydraulic chamber, a quick closing electromagnetic valve configured to open the first dump valve and the second dump valve during execution of the quick closing operation, a first blocking electromagnetic valve arranged in a first opening degree controlling oil passage connecting between the bidirectional pump and the first hydraulic chamber, which is configured to block the first opening degree controlling oil passage during the execution of the quick closing operation, and a second blocking electromagnetic valve arranged in a second opening degree controlling oil passage connecting between the bidirectional pump and the second hydraulic chamber, Which is configured to block the second opening degree controlling oil passage during the execution of the quick closing operation, wherein by executing the quick closing operation, the quick closing mechanism is configured to feed the working oil accumulated in an accumulator to the second hydraulic chamber and configured to drain the working oil from the first hydraulic chamber to a reservoir. ### Claim 2 (depends on 1) The steam turbine valve drive apparatus according to claim 1, wherein the quick closing mechanism is configured to execute a release operation in which the quick closing electromagnetic valve is changed from a non-excited state to an excited state to cause the bidirectional pump to feed the working oil from the reservoir to a pilot port of the first dump valve and a pilot port of the second dump valve via the quick closing electromagnetic valve to thereby close the first dump valve and the second dump valve. ### Claim 3 (depends on 2) The steam turbine valve drive apparatus according to claim 2, configured such that the working oil discharged from the bidirectional pump flows into the quick closing electromagnetic valve via a check valve. ### Claim 4 (depends on 3) The steam turbine valve drive apparatus according to claim 3, configured such that the working oil stored in the reservoir flows into the bidirectional pump via a pilot check valve. ### Claim 5 (depends on 2) The steam turbine valve drive apparatus according to claim 2, configured such that the working oil stored in the reservoir flows into the bidirectional pump via a pilot check valve. ### Claim 6 (depends on 1) The steam turbine valve drive apparatus according to claim 1, wherein the quick closing mechanism is configured to execute a feed operation in which the bidirectional pump feeds the working oil from the reservoir to the accumulator with the quick closing electromagnetic valve being in an excited state and the first dump valve and the second dump valve closed. ### Claim 7 (depends on 6) The steam turbine valve drive apparatus according to claim 6, further comprising: a hydraulic pressure detector configured to detect a hydraulic pressure of the working oil accumulated in the accumulator, wherein the quick closing mechanism is configured to execute the feed operation when the hydraulic pressure detected by the hydraulic pressure detector is less than a prescribed value. ### Claim 8 (depends on 7) The steam turbine valve drive apparatus according to claim 7, configured such that the working oil stored in the reservoir flows into the bidirectional pump via a pilot check valve. ### Claim 9 (depends on 6) The steam turbine valve drive apparatus according to claim 6, configured such that the working oil discharged from the bidirectional pump flows into the accumulator via a check valve. ### Claim 10 (depends on 9) The steam turbine valve drive apparatus according to claim 9, configured such that the working oil stored in the reservoir flows into the bidirectional pump via a pilot check valve. ### Claim 11 (depends on 6) The steam turbine valve drive apparatus according to claim 6, configured such that the working oil stored in the reservoir flows into the bidirectional pump via a pilot check valve. ### Claim 12 (depends on 1) The steam turbine valve drive apparatus according to claim 1, further comprising: a closing spring configured to bias the operation rod in a direction of closing the steam valve. ### Claim 13 (depends on 1) The steam turbine valve drive apparatus according to claim 1, further comprising: a controller; a dynamic brake device; and a switch configured to switch to electrically connect the servo motor to one of a servo driver and the dynamic brake device, wherein when the controller detects that an abnormality has occurred in the servo driver, the controller controls the switch to perform the switching to electrically connect the servo motor to the dynamic brake device to cause the dynamic brake device to stop an operation of the servo motor. ### Claim 14 (depends on 1) The steam turbine valve drive apparatus according to claim 1, further comprising: a controller; and a gas pressure detector; wherein: the accumulator is configured to be charged with gas and configured to release the working oil to an outside by expansion of the gas; the gas pressure detector is configured to detect pressure of the gas with which the accumulator is charged; and when the pressure detected by the gas pressure detector is less than a prescribed value, the controller controls the accumulator to be charged with the gas.