# US 2025/0082970 A1 · Ventilation apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0082970 A1 - Document ID: US20250082970A1 - Status: Published application - Kind: A1 - Application number: 18/722,431 - Filed: 2022-12-21 - Published: 2025-03-13 - Earliest claimed: 2021-12-21 - Assignees: Aviation Works Ltd - Applicants: Aviation Works Limited - Inventors: Rob Boyle; Tim Wakeford - Web page: https://patentgrep.com/patent/US20250082970A1 ## CPC - A62B 7/02: with compressed oxygen or air - A62B 7/14: for high-altitude aircraft - A62B 9/02: Valves {(non-return valves mounted in breathing masks or helmets A62B18/10)} - B64D 11/00: Passenger or crew accommodation; Flight-deck installations not otherwise provided for - B64D 2231/02: Supply or distribution systems - A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00) - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT ## Abstract An apparatus for preparing a ventilation gas mixture, the apparatus comprising: a first gas feed configured to receive carbon dioxide via a first gas valve; a second gas feed configured to receive oxygen via a second gas valve; a gas mixing device 5 configured to receive the carbon dioxide and the oxygen from the first and second gas feeds and combine the carbon dioxide with the oxygen in the gas mixing device to form a ventilation gas mixture; an adjuster configured to adjust the first and second gas valves between an open position and a closed position in order to adjust the relative amounts of carbon dioxide and oxygen forming the ventilation 10 gas mixture; and wherein the adjuster is configured to adjust the first and a second gas valves based on an air pressure applied to the apparatus. ## Claims ### Claim 1 An apparatus for preparing a ventilation gas mixture, the apparatus comprising: a first gas feed configured to receive carbon dioxide via a first gas valve; a second gas feed configured to receive oxygen via a second gas valve; a gas mixing device configured to receive the carbon dioxide and the oxygen from the first and second gas feeds and combine the carbon dioxide with the oxygen in the gas mixing device to form a ventilation gas mixture; an adjuster configured to adjust the first and second gas valves between an open position and a closed position in order to adjust the relative amounts of carbon dioxide and oxygen forming the ventilation gas mixture; and wherein the adjuster is configured to adjust the first and second gas valves based on an air pressure applied to the apparatus. ### Claim 2 (depends on 1) The apparatus of claim 1 wherein the adjuster is configured to adjust the first and second gas valves based on an air pressure applied to the adjuster. ### Claim 3 (depends on 1) The apparatus of claim 1 wherein the adjuster comprises a diaphragm, connected to the second gas valve, wherein the second gas valve is adjusted based on an air pressure applied to the diaphragm. ### Claim 4 (depends on 3) The apparatus of claim 3 wherein the diaphragm is also connected to the first gas valve, wherein the first gas valve is adjusted based on the air pressure applied to the diaphragm. ### Claim 5 (depends on 3) The apparatus of claim 3 wherein the adjuster comprises a first arm connected to the first gas valve and the diaphragm, wherein the first gas valve is adjusted through movement of the first arm, the movement of the first arm based on the air pressure applied to the diaphragm. ### Claim 6 (depends on 3) The apparatus of claim 3 wherein the adjuster comprises a second arm connected to the second gas valve and the diaphragm, wherein the second gas valve is adjusted through movement of the second arm, the movement of the second arm based on the air pressure applied to the diaphragm. ### Claim 7 (depends on 1) The apparatus of claim 1 wherein the adjuster is configured to adjust the first and second gas valves towards an open position as the air pressure applied to the apparatus decreases. ### Claim 8 (depends on 1) The apparatus of claim 1 wherein the adjuster is configured to adjust the first and second gas valves towards a closed position as the air pressure applied to the apparatus increases. ### Claim 9 (depends on 1) The apparatus of claim 1 where the first and second gas valves are configured to move substantially simultaneously. ### Claim 10 (depends on 1) The apparatus of claim 1 wherein the first and second gas valves are arranged to be adjusted electronically by the adjuster based on an air pressure that is determined by an air pressure sensor and in communication with the adjuster. ### Claim 11 (depends on 1) An aircraft comprising the apparatus according to claim 1. ### Claim 12 A method of adjusting first and second gas valves in an apparatus, wherein the apparatus comprises a gas mixing device, the method comprising the steps of: receiving, in a gas mixing device, carbon dioxide from a first gas feed via a first gas valve; receiving, in the gas mixing device, oxygen from a second gas feed via a second gas valve; combining, in the gas mixing device, the carbon dioxide with the oxygen to form a ventilation gas mixture; and adjusting, by an adjuster, the first and second gas valves between an open position and a closed position in order to adjust the relative amounts of carbon dioxide and oxygen forming the ventilation gas mixture; wherein adjusting the first and second gas valves is based on an air pressure that is applied to the apparatus.