# US 5,350,153 A · Core design for electromagnetically actuated valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,350,153 A - Document ID: US5350153A - Status: Granted - Kind: A - Application number: 08/084,814 - Filed: 1993-06-28 - Granted: 1994-09-27 - Earliest claimed: 1992-10-05 - Assignees: Aura Systems, Inc. - Inventors: Fernando B. Morinigo; William C. Blaire; Dennis Bulgatz - Web page: https://patentgrep.com/patent/US5350153A ## CPC - F16K 31/0679: {with more than one energising coil} - F01L 9/20: by electric means - H01F 7/1638: {Armatures not entering the winding} - H01F 2007/1676: {Means for avoiding or reducing eddy currents in the magnetic circuit, e.g. radial slots} - 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)} - F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract An improved electromagnetically actuated valve is disclosed. The improved valve design includes a layer of structurally stable, non-magnetic material, preferably Kapton or Chrome, disposed intermediate the core element and the electromagnetic element of the valve, and a core element and electromagnetic element fabricated from a high electrical resistive iron material. The layer of non-magnetic structurally stable material and high resistance core element serve to eliminate the hysteresis effect in the magnetic force of the valve. The core element may also include radially extending or axially extending perforations through the core element. The axial and radial perforations serve to reduce the weight of the core design and the axial perforations serve to reduce the effect of the air spring created in the gap as the core element approaches the electromagnetic element during operation of the valve. ## Claims ### Claim 1 In an electromagnetically actuated valve having at least one electromagnetic assembly including an electromagnetic element and a coil disposed within the electromagnetic element, and at least one core element defining an upper surface, a lower surface, an outer edge surface and a central axis and being biased in an initial spaced apart relationship from the electromagnetic element, an improvement comprising: a layer of structurally stable, non-magnetic material disposed intermediate the electromagnetic element and the core element; and, at least one radial aperture extending radially at least partially through the core element intermediate the upper surface and the lower surface. ### Claim 2 (depends on 1) An electromagnetically actuated valve in accordance with claim 1 wherein said layer of structurally stable, non-magnetic material is coated onto the core element. ### Claim 3 (depends on 1) An electromagnetically actuated valve in accordance with claim 1 wherein said layer of structurally stable, non-magnetic material is coated onto a portion of the electromagnetic element. ### Claim 4 (depends on 1) An electromagnetically actuated valve in accordance with claim 1 wherein said layer of material is comprised of Kapton. ### Claim 5 (depends on 1) An electromagnetically actuated valve in accordance with claim 1 wherein said a layer of material is comprised of Chrome. ### Claim 6 (depends on 1) An electromagnetically actuated valve in accordance with claim 1 wherein said layer of structurally stable non-magnetic material is approximately 2-3 thousandths of an inch in thickness. ### Claim 7 (depends on 1) An electromagnetically actuated valve in accordance with claim 1 wherein the improvement further comprises the core element and electromagnetic element being fabricated from a high electrical resistivity material. ### Claim 8 (depends on 7) An electromagnetically actuated valve in accordance with claim 7 wherein the high resistivity material is silicon iron. ### Claim 9 (depends on 1) An electromagnetically actuated valve in accordance with claim 1 wherein the improvement further comprises the core element defining at least one non-radially oriented aperture, said non-radially oriented aperture being offset from the central axis of the core element. ### Claim 10 (depends on 9) An electromagnetically actuated valve in accordance with claim 9 wherein the diameter of said aperture is approximately one-eighth of an inch. ### Claim 11 In an electromagnetically actuated valve having an electromagnetic element, a coil disposed within the electromagnetic element, and an annular-shaped core element having an upper surface, a lower surface and an outer edge surface, and defining a central axis, and being biased in a normally spaced apart relationship from the electromagnet, an improvement comprising: said core element defining at least one radial aperture extending radially at least partially through the core element intermediate the upper surface and the lower surface. ### Claim 12 (depends on 11) An electromagnetically actuated valve in accordance with claim 11 wherein said radial aperture begins at the outer edge surface of the core element. ### Claim 13 (depends on 12) An electromagnetically actuated valve in accordance with claim 12 wherein said radial aperture extends approximately five-sixteenths of an inch toward the central axis from the outer edge surface of the core element. ### Claim 14 (depends on 11) An electromagnetically actuated valve in accordance with claim 11 wherein the diameter of said radial aperture is approximately one-eighth of an inch. ### Claim 15 (depends on 11) An electromagnetically actuated valve in accordance with claim 11 wherein said core element further defines at least one axially oriented aperture, said axially oriented aperture being offset from the central axis. ### Claim 16 (depends on 15) An electromagnetically actuated valve in accordance with claim 15 wherein the diameter of said axially oriented aperture is approximately one-eighth of an inch.