# US 10,480,346 B2 · Hydraulic control device for an emergency stop valve of a steam turbine and steam turbine arrangement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,346 B2 - Document ID: US10480346B2 - Status: Granted - Kind: B2 - Application number: 15/316,261 - Filed: 2015-06-03 - Published: 2017-06-01 - Granted: 2019-11-19 - Earliest claimed: 2014-06-03 - Assignees: Voith Patent GmbH - Applicants: Voith Patent GmbH - Inventors: Matthias Leykauf - Web page: https://patentgrep.com/patent/US10480346B2 ## CPC - F01D 21/02: Shutting-down responsive to overspeed - F01D 17/26: fluid, e.g. hydraulic - F01D 21/18: involving hydraulic means - F15B 20/001: {Double valve requiring the use of both hands simultaneously} - F15B 20/008: {Valve failure} - F05D 2220/31: in steam turbines - 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 - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A hydraulic control device for an emergency stop valve of a steam turbine has a module for reducing a hydraulic pressure by rapid opening of an outflow valve and/or unloading or loading an actuator for actuating the emergency stop valve. In an operating medium supply and/or conducting system a control valve arrangement with at least three safety valves is provided, which are hydraulically interconnected such that they open the outflow valve or unload or load the actuator only when a safety circuit by way of at least two safety valves of the control valve arrangement has assumed an emergency stop position. A precontrol valve that is independent from the remaining safety valves is hydraulically connected upstream of each safety valve. A safety valve that is connected downstream of a respective precontrol valve can be hydraulically decoupled from the same during the operation. ## Claims ### Claim 1 A hydraulic control device for an emergency stop valve of a steam turbine, comprising: a module for reducing a hydraulic pressure by rapid opening of an outflow valve and/or changing a load on an actuator for actuating the emergency stop valve; a control valve arrangement with at least three safety valves provided in an operating medium supply and/or conducting system, said at least three safety valves being hydraulically interconnected to open the outflow valve or change a load on the actuator only when a safety circuit by way of at least two safety valves of said control valve arrangement have assumed an emergency stop position; at least three precontrol valves, with a respective said precontrol valve hydraulically connected upstream, in a flow direction from a pressure source towards a pressure sink, of each said safety valve and independent from remaining said safety valves, wherein the respective said safety valve that is connected downstream of a respective said precontrol valve can be hydraulically decoupled from the respective said precontrol valve during operation, and wherein said three precontrol valves are connected in parallel. ### Claim 2 (depends on 1) The control device according to claim 1, wherein said three precontrol valves are hydraulically coupled to one another. ### Claim 3 (depends on 2) The control device according to claim 2, which comprises a common connection line with a pressure source and a common connection line with a pressure sink hydraulically coupling said precontrol valves to one another. ### Claim 4 (depends on 1) The control device according to claim 1, wherein each individual said precontrol valve is configured to assume at least two valve positions, namely: a first valve position, in which a connector for direct or indirect coupling of said precontrol valve to a pressure source is fluidically connected with a connector for a direct or indirect fluidic connection with a connector on said safety valve; and a second valve position, in which a connector for direct or indirect coupling of said precontrol valve with a pressure source is fluidically separated from a connector for direct or indirect fluidic connection with a connector on said safety valve. ### Claim 5 (depends on 1) The control device according to claim 1, wherein each said precontrol valve is a multiple transfer valve. ### Claim 6 (depends on 5) The control device according to claim 5, wherein each said multiple transfer valve is a 6/2-way valve. ### Claim 7 (depends on 1) The control device according to claim 1, wherein each said safety valve is a safety transfer valve, comprising: at least two connectors including a connector for direct or indirect coupling with a pressure source and a connector for direct or indirect coupling with a pressure sink; at least two valve positions, including: a first valve position in which said connector on said safety transfer valve for fluidic connection with said precontrol valve connected upstream of the respective said safety transfer valve is fluidically disconnected or shut off with a connector on said safety transfer valve (1.5) for coupling with a pressure sink; and a second valve position in which said connector on said safety transfer valve for fluidic connection with said precontrol valve connected upstream of the respective said safety transfer valve is fluidically connected to a connector on said safety transfer valve for coupling with a pressure sink. ### Claim 8 (depends on 7) The control device according to claim 7, wherein each said safety transfer valve is a multiple transfer valve, comprising two connectors in each case for a fluidic connection with connectors on said precontrol valve connected upstream of said safety transfer valve, a connector for coupling with a pressure sink, and a connector for a fluidic coupling with a connector on one of the other said precontrol valves. ### Claim 9 (depends on 8) The control device according to claim 8, wherein each said safety transfer valve is a 4/2-way valve. ### Claim 10 (depends on 1) The control device according to claim 1, which further comprises a test control valve arrangement including at least one transfer valve for carrying out a partial stroke test. ### Claim 11 (depends on 10) The control device according to claim 10, wherein said at least one transfer valve of said test control valve arrangement is one of two 2/2-way valves arranged in series. ### Claim 12 (depends on 1) The control device according to claim 1, which comprises an external outflow valve connected between the actuator interacting with the emergency stop valve and the module. ### Claim 13 (depends on 1) A steam turbine arrangement, comprising a steam turbine, a steam mass flow supply assigned to said steam turbine, and an emergency stop valve in said steam mass flow supply, and a hydraulic control device according to claim 1 assigned to said emergency stop valve.