# US 9,435,311 B2 · Regulator flow damping > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,311 B2 - Document ID: US9435311B2 - Status: Granted - Kind: B2 - Application number: 14/272,085 - Filed: 2014-05-07 - Published: 2015-11-12 - Granted: 2016-09-06 - Earliest claimed: 2014-05-07 - Assignees: Woodward, Inc. - Applicants: Woodward, Inc. - Inventors: Brett J. Snodgrass; Paul J. Schaefer; Brian K. Lawver - Web page: https://patentgrep.com/patent/US9435311B2 ## CPC - F02M 69/54: Arrangement of fuel pressure regulators - F02C 7/232: Fuel valves {(control of fuel supply by means of fuel metering valves F02C9/263)}; Draining valves or systems (valves in general F16K) - F02C 9/263: {by means of fuel metering valves} - Y10T 137/0379: By fluid pressure - Y10T 137/7801: Balanced valve - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The subject matter of this specification can be embodied in, among other things, a method that includes providing a fluid at a fluid inlet fluidically connected to an input fluid path, providing a fluid outlet fluidically connected to an outlet fluid path, fluidically connecting the inlet fluid path to the outlet fluid path through a valve, fluidically connecting the inlet fluid and the outlet fluid through a bypass fluid path in parallel with the valve, flowing the fluid from the inlet fluid path to the outlet fluid path through the valve and the bypass fluid path at a regulated fluid flow rate, restricting fluid flow in the bypass fluid path with a first orifice, restricting fluid flow in one of the fluid inlet path or the fluid outlet path with a second orifice, and providing the fluid at the fluid outlet at an outlet fluid flow rate. ## Claims ### Claim 1 A fuel flow regulator system for regulating flow, comprising: a fuel delivery path operable to provide a regulated fuel fluid flow between a fuel inlet and a fuel outlet; a fuel bypass valve in the fuel delivery path operable to selectively provide a restriction in the fuel delivery path in response to the pressures of the fuel inlet and the fuel outlet of the regulated fuel fluid flow, wherein the bypass valve is fluidically connected to a fluid inlet path fluidically connected with the fuel inlet and a fluid outlet path fluidically connected with the fuel outlet; a bypass fluid path fluidically connecting the fluid inlet path and the fluid outlet path and parallel with the fuel bypass valve; a first restricting orifice in the bypass fluid path; and a second restricting orifice in one of the fluid inlet path or the fluid outlet path. ### Claim 2 (depends on 1) The fuel flow regulator system of claim 1, wherein the second restricting orifice restricts the fluid outlet path. ### Claim 3 (depends on 2) The fuel flow regulator system of claim 2, further comprising a third restricting orifice in the fluid inlet path. ### Claim 4 (depends on 1) The fuel flow regulator system of claim 1, wherein the first restricting orifice has a size selected based on a minimum fluid flow rate. ### Claim 5 (depends on 4) The fuel flow regulator system of claim 4, wherein the outlet fluid flow rate is the sum of the minimum fluid flow rate and the regulated fluid flow rate. ### Claim 6 (depends on 4) The fuel flow regulator system of claim 4, wherein the second restricting orifice has a size selected based on a bypass path flow rate, and the outlet flow rate is the sum of the minimum fluid flow rate, the bypass path flow rate, and the regulated fluid flow rate. ### Claim 7 (depends on 1) The fuel flow regulator system of claim 1, wherein the fluid inlet path further comprises a filter screen configured to resist the flow of ice or contaminant particle flow. ### Claim 8 (depends on 1) The fuel flow regulator system of claim 1, wherein the fluid inlet path further comprises a heating element. ### Claim 9 A method of regulating fluid flow comprising: providing a regulated fluid flow between a fluid inlet and a fluid outlet; providing an inlet fluid path fluidically connected to the fluid inlet; providing an outlet fluid path fluidically connected to the fluid outlet; fluidically connecting the inlet fluid path and the outlet fluid path to a bypass valve in the fluid path; fluidically connecting the inlet fluid path and the outlet fluid path through a bypass fluid path parallel with the bypass valve; operating the bypass valve in response to the pressures of the fluid inlet and the fluid outlet to provide a restriction in the fluid path; restricting fluid flow in the bypass fluid path with a first restricting orifice; restricting fluid flow in one of the inlet fluid path or the outlet fluid path with a second restricting orifice; and providing the fluid at the fluid outlet at an outlet fluid flow rate. ### Claim 10 (depends on 9) The method of claim 9, wherein the second restricting orifice restricts the outlet fluid path. ### Claim 11 (depends on 10) The method of claim 10, further comprising a third restricting orifice restricting the inlet fluid path. ### Claim 12 (depends on 9) The method of claim 9, wherein the first restricting orifice has a size selected based on a minimum fluid flow rate. ### Claim 13 (depends on 12) The method of claim 12, wherein the outlet fluid flow rate is the sum of the minimum fluid flow rate and the regulated fluid flow rates. ### Claim 14 (depends on 12) The method of claim 12, wherein the second restricting orifice has a size selected based on a bypass path flow rate, and the outlet fluid flow rate is the sum of the minimum fluid flow rate, the bypass path flow rate, and the regulated fluid flow rate. ### Claim 15 (depends on 9) The method claim 9, wherein the inlet fluid path further comprises a filter screen configured to resist the flow of ice or contaminant particle flow. ### Claim 16 (depends on 9) The method claim 9, wherein the inlet fluid path further comprises a heating element.