# US 2019/0168608 A1 · Fuel shutoff valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168608 A1 - Document ID: US20190168608A1 - Status: Published application - Kind: A1 - Application number: 16/268,524 - Filed: 2019-02-06 - Published: 2019-06-06 - Earliest claimed: 2016-08-09 - Assignees: Kyosan Denki Co., Ltd. - Applicants: Kyosan Denki Co., Ltd. - Inventors: Akinari SUGIYAMA - Web page: https://patentgrep.com/patent/US20190168608A1 ## CPC - B60K 15/03519: {Valve arrangements in the vent line} - B60K 15/035: characterised by venting means - F16K 24/044: {the float being rigidly connected to the valve element, the assembly of float and valve element following a substantially translational movement when actuated, e.g. also for actuating a pilot valve} - F16K 31/22: with the float rigidly connected to the valve - F16K 31/28: with two ore more floats actuating one valve - B60K 2015/03566: {comprising means for stopping the venting of fuel vapor, e.g. during refuelling or engine stop} - F02M 35/10222: {Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission} - F02M 37/0023: {Valves in the fuel supply and return system} - Y10T 137/0874: Vent opening or closing on tipping container - Y10T 137/3099: Float responsive - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - 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)} - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A fuel shutoff valve includes a valve, a float, and an auxiliary member. The valve is configured to open or close an air passage of a fuel tank. The float floats on fuel and moves in a valve closing direction to close the valve, or in a valve opening direction opposite to the valve closing direction to open the valve. The auxiliary member has a predetermined weight, and abuts on the float to apply a weight on the float in the valve opening direction, or separating from the float not to apply the weight on the float in the valve closing direction. ## Claims ### Claim 1 A fuel shutoff valve comprising: a valve configured to open or close an air passage of a fuel tank; a float floating on fuel and moving in a valve closing direction to close the valve, or moving in a valve opening direction opposite to the valve closing direction to open the valve; and an auxiliary member having a predetermined weight, the auxiliary member abutting on the float to apply a weight on the float in the valve opening direction, or separating from the float not to apply the weight on the float in the valve closing direction, wherein the auxiliary member is disposed on an outer side of the float in a radial direction. ### Claim 2 (depends on 1) The fuel shutoff valve according to claim 1, wherein the auxiliary member is provided between the valve and the float to separate from the float and abut on the valve to apply the weight on the valve in the valve closing direction. ### Claim 3 (depends on 2) The fuel shutoff valve according to claim 2, wherein the valve has a housing defining the air passage and a main valve seat fixed on the air passage, and a main valve body that is movable to be seated on the main valve seat, and the auxiliary member has a stopper surface configured to abut on the housing to restrict a deformation of the main valve body. ### Claim 4 (depends on 1) The fuel shutoff valve according to claim 1, wherein the auxiliary member has an abutting portion that abuts on the float in the valve opening direction, and the float has a shoulder portion configured to receive the auxiliary member. ### Claim 5 (depends on 4) The fuel shutoff valve according to claim 4, wherein the float has a large diameter portion, a small diameter portion smaller than the large diameter portion in diameter, and the shoulder portion located between the large diameter portion and the small diameter portion, and the auxiliary member is a tubular member disposed on an outer side of the float in a radial direction. ### Claim 6 (depends on 1) The fuel shutoff valve according to claim 1, wherein the valve has a main valve configured to open or close the air passage, and a pilot valve configured to open or close a pilot passage smaller than the air passage, the pilot passage communicating an upstream and a downstream of the main valve, the main valve has a main valve seat provided on the air passage and a main valve body configured to open or close the air passage in cooperation with the main valve seat, and the pilot valve has a pilot valve seat provided on the pilot passage and a pilot valve body configured to open or close the pilot passage in cooperation with the pilot valve seat. ### Claim 7 (depends on 6) The fuel shutoff valve according to claim 6, wherein the pilot passage is provided in the main valve body, and the pilot valve body is provided between the main valve body and the float and transmits a movement of the float to the main valve body. ### Claim 8 (depends on 6) The fuel shutoff valve according to claim 6, further comprising: a movable connector disposed between the main valve body and the float to connect the main valve body and the float with each other so as to enable opening or closing of the pilot valve. ### Claim 9 (depends on 6) The fuel shutoff valve according to claim 6, wherein the pilot valve seat and the pilot valve body are made of a hard resin material. ### Claim 10 (depends on 6) The fuel shutoff valve according to claim 6, wherein the main valve seat is made of a hard resin material, and the main valve body is made of a material that is softer than the main valve seat.