# US 2013/0156547 A1 · Adaptive Eductor System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156547 A1 - Document ID: US20130156547A1 - Status: Published application - Kind: A1 - Application number: 13/331,062 - Filed: 2011-12-20 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: General Electric Company - Inventors: Ning Fang; Benjamin Joseph Simpson; Duane Howard Anstead; Adam Mitchell Record; Donald James Welty - Web page: https://patentgrep.com/patent/US20130156547A1 ## CPC - F01D 11/04: using sealing fluid, e.g. steam - F01D 25/183: {Sealing means} - F02C 7/06: Arrangements of bearings (bearings F16C); Lubricating ({of turbo machines F01D25/18; of machines or} engines in general F01M) - F05D 2260/601: using an ejector or a jet pump - F05D 2260/609: Deoiling or demisting - F05D 2270/301: Pressure - Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An apparatus is provided having a first zone with a fluid flow at a first pressure, and a second zone with a fluid flow at a second pressure. A sump cavity is provided in fluid communication with the first zone and a sump vent. An eductor system may be provided with a fluid flow path therethrough and in fluid communication with the second zone and the sump vent. The eductor system may be provided with an altitude sensing valve and may also be provided with gage pressure sensing valve. The eductor system may further be provided with a second gage pressure sensing valve and may also be provided with an orifice plate. The gage pressure sensing valves may react to the gage pressure of the second zone. ## Claims ### Claim 1 An eductor for a gas turbine engine comprising: a first zone having a first fluid flow at a first pressure; a second zone having a second fluid flow at a second pressure; a lubrication sump cavity in fluid communication with said first zone and a sump vent; and an eductor valve system having a fluid flow path therethrough in fluid communication with said second zone and said sump vent, and comprising an altitude sensing valve and a gage pressure sensing valve. ### Claim 2 (depends on 1) The eductor for a gas turbine engine of claim 1, wherein said altitude sensing valve remains open at up to and below an altitude height and remains closed at all other conditions. ### Claim 3 (depends on 1) The eductor for a gas turbine engine of claim 1 further comprising: an orifice plate in series through said fluid flow path with said gage pressure sensing valve. ### Claim 4 (depends on 1) The eductor for a gas turbine engine of claim 1 further comprising: a second gage pressure sensing valve in series through said fluid flow path with said altitude sensing valve. ### Claim 5 (depends on 4) The eductor for a gas turbine engine of claim 4, wherein said gage pressure sensing valve remains open at and below a first gage pressure and remains closed at all other conditions. ### Claim 6 (depends on 5) The eductor for a gas turbine engine of claim 5, wherein said second gage pressure sensing valve remains open at and below a second gage pressure and remains closed at all other conditions. ### Claim 7 (depends on 6) The eductor for a gas turbine engine of claim 6, wherein said first gage pressure is less than or equal to said second gage pressure. ### Claim 8 (depends on 4) The eductor for a gas turbine engine of claim 4, wherein said gage pressure sensing valve and said second gage pressure sensing valve react to the gage pressure of said second zone. ### Claim 9 An eductor for a gas turbine engine comprising: a first zone having a first fluid flow at a first pressure; a second zone having a second fluid flow at a second pressure; a lubrication sump cavity in fluid communication with said first zone and a sump vent; and an eductor valve system having a fluid flow path therethrough in fluid communication with said second zone and said sump vent, and comprising an altitude sensing valve in parallel through said fluid flow path with a gage pressure sensing valve. ### Claim 10 (depends on 9) The eductor for a gas turbine engine of claim 9, wherein said altitude sensing valve remains open at up to and below an altitude height and remains closed at all other conditions. ### Claim 11 (depends on 9) The eductor for a gas turbine engine of claim 9 further comprising: an orifice restrictor plate in series with said gage pressure sensing valve. ### Claim 12 (depends on 9) The eductor for a gas turbine engine of claim 9 further comprising: a second gage pressure sensing valve in series through said fluid flow path with said altitude sensing valve. ### Claim 13 (depends on 9) The eductor for a gas turbine engine of claim 9, wherein said gage pressure sensing valve remains open at and below a first gage pressure of said second zone and remains closed at all other conditions. ### Claim 14 (depends on 13) The eductor for a gas turbine engine of claim 13 further comprising: a second gage pressure sensing valve in series through said fluid flow path with said altitude sensing valve; wherein said second gage pressure sensing valve remains open and below a second gage pressure of said second zone and remains closed at all other conditions. ### Claim 15 (depends on 14) The eductor for a gas turbine engine of claim 14, wherein said first gage pressure is different than said second gage pressure. ### Claim 16 (depends on 14) The eductor for a gas turbine engine of claim 14, wherein said first gage pressure is less than or equal to said second gage pressure. ### Claim 17 (depends on 14) The eductor for a gas turbine engine of claim 14 further comprising a nozzle in fluid communication with said lubrication sump cavity through said sump vent and a vent tube. ### Claim 18 An apparatus comprising: a gas turbine engine having a low pressure compressor zone and a high pressure compressor zone; said low pressure compressor zone having a fluid flow at a first pressure corresponding to a power output of said engine; said high pressure compressor zone having a fluid flow at a second pressure corresponding to said power output of said engine; a lubrication sump cavity in fluid communication with said low pressure compressor zone and a sump cavity vent; and an eductor valve system having a fluid flow path therethrough in fluid communication with said high pressure compressor zone and said sump vent, and comprising an altitude sensing valve, a first gage pressure sensing valve, and a second gage pressure sensing valve; wherein said altitude sensing valve is in parallel through said fluid flow path with said first gage pressure sensing valve; and wherein said altitude sensing valve is in series through said fluid flow path with said second gage pressure sensing valve. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein said first gage pressure sensing valve and said second gage pressure sensing valve react to the gage pressure of said second zone. ### Claim 20 (depends on 18) The apparatus of claim 18 further comprising an orifice restrictor in series through said fluid flow path with said first gage pressure sensing valve.