# US 10,865,712 B2 · Valve assembly with oil shut-off valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,712 B2 - Document ID: US10865712B2 - Status: Granted - Kind: B2 - Application number: 15/990,743 - Filed: 2018-05-28 - Published: 2018-09-27 - Granted: 2020-12-15 - Earliest claimed: 2015-06-18 - Assignees: Pratt & Whitney Canada Corp. - Applicants: Pratt & Whitney Canada Corp. - Inventors: Charles Faubert; Johnny Vinski; Valeri Soukhostavets - Web page: https://patentgrep.com/patent/US10865712B2 ## CPC - F02C 7/06: Arrangements of bearings (bearings F16C); Lubricating ({of turbo machines F01D25/18; of machines or} engines in general F01M) - F16K 3/029: {with two or more gates} - F16K 3/26: with fluid passages in the valve member - F16K 3/32: Means for additional adjustment of the rate of flow - F16K 17/02: opening on surplus pressure on one side; closing on insufficient pressure on one side (check valves F16K15/00) - F16K 31/12: actuated by fluid ({fluid-actuated lift valves F16K1/126} ; fluid-actuated check valves F16K15/00; fluid-actuated safety valves F16K17/00) - F16K 31/1221: {one side of the piston being spring-loaded} - F16K 31/1225: {with a plurality of pistons} - F16K 31/1226: {the fluid circulating through the piston} - 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) - 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)} ## Abstract A gas turbine engine valve assembly having an oil shut-off valve and a compensating valve fluidly connected thereto. The compensating valve, in a first position, restricts access to a pressure-reducing oil flow path leading to an oil reservoir, and in a second position, provides access to the pressure-reducing oil flow path. The pressure-reducing oil flow path is defined by fluid flow between housing apertures, a laminar hole and an orifice. The valve assembly is operable between a first configuration, wherein the oil shut-off valve is in a fluid transfer position and a piston of the compensating valve is in a closed position to direct oil toward the engine component, and a second configuration, wherein the oil shut-off valve is in the shut-off position and the piston is in a open position to direct oil toward the oil reservoir via the pressure-reducing oil flow path. ## Claims ### Claim 1 A method of managing a flow of oil to a component of a gas turbine engine, comprising: conveying the flow of oil from an oil supply pump simultaneously towards an oil shut-off valve and a compensating valve, the oil shut-off valve and the compensating valve being upstream of a bearing cavity; bypassing the flow of oil from the component by at least closing the oil shut-off valve to direct oil towards an oil reservoir via the compensating valve; directing the flow of oil towards the component via the oil shut-off valve by closing the compensating valve and opening the oil shut-off valve; wherein the oil shut-off valve is operated as a function of oil pressure produced by the supply pump which is generated by a rotational speed of a gas generator of the gas turbine engine; and the compensating valve is operated independently of the oil-shut off valve as a function of a viscosity of the oil, the compensating valve including a laminar hole and an orifice which operate to make the compensating valve sensitive to oil temperature, the laminar hole extending through one of a piston and a housing of the compensating valve, and the orifice extending through the other one of the piston and the housing, the laminar hole and the orifice creating a pressure gradient across the piston to displace the piston, the laminar hole extending through the housing at the same end thereof as a biasing element acting against the piston of the compensating valve, the laminar hole and the orifice being in serial flow communication. ### Claim 2 (depends on 1) The method of claim 1, wherein bypassing the flow of oil includes opening the compensating valve. ### Claim 3 (depends on 1) The method of claim 1, wherein bypassing the flow of oil includes directing the oil radially away from a central axis of the compensating valve through apertures in the compensating valve, when the rotational speed of the gas generator of the gas turbine engine is less than 10,000 RPM. ### Claim 4 (depends on 1) The method of claim 1, wherein directing the flow of oil towards the component includes blocking apertures of the compensating valve, when the rotational speed of the gas generator of the gas turbine engine is greater than 10,000 RPM. ### Claim 5 (depends on 1) The method of claim 1, further comprising directing the flow of oil towards both the component and the oil reservoir when the oil shut-off valve is between open and closed positions, and when the compensating valve is between open and closed positions. ### Claim 6 (depends on 1) The method of claim 1, wherein directing the flow of oil towards the component further includes using the compensating valve to reduce a pressure of the oil provided to the oil shut-off valve.