# US 2021/0332984 A1 · Flushing machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0332984 A1 - Document ID: US20210332984A1 - Status: Published application - Kind: A1 - Application number: 17/274,232 - Filed: 2019-08-29 - Published: 2021-10-28 - Earliest claimed: 2018-09-07 - Applicants: Adey Holdings (2008) Limited - Inventors: Alan Pearcy; Simon Downie - Web page: https://patentgrep.com/patent/US20210332984A1 ## CPC - F24D 19/0092: {Devices for preventing or removing corrosion, slime or scale} - B08B 9/0325: {Control mechanisms therefor} - B08B 9/032: by the mechanical action of a moving fluid, e.g. by flushing (B08B9/04 takes precedence {; by fluid jets mounted on cleaning devices B08B9/0433}) - B08B 2209/032: by the mechanical action of a moving fluid - F24D: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02) - B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL ## Abstract A flushing machine (10) comprises at least one magnetic filter (24a, 24b), a pump (26), and first and second connections (40a, 40b) for connecting to a central heating circuit (40) to (5) be flushed, and valve means (36, 38) enabling the flow direction through ## Claims ### Claim 1 A flushing machine comprising at least one magnetic filter, a pump, and first and second connections for connecting to a central heating circuit to be flushed, and a valve means enabling a flow direction through the first and second connections to be changed. ### Claim 2 (depends on 1) The flushing machine according to claim 1, in which the magnetic filter, the pump and the valve means are connected to direct a flow through the filter before the pump, irrespective of the direction of the flow through the first and second connections. ### Claim 3 (depends on 1) The flushing machine according to claim 1, in which the valve means includes at least two 2-way valves. ### Claim 4 (depends on 1) The flushing machine according to claim 1, in which there are two magnetic filters connected in series. ### Claim 5 (depends on 1) The flushing machine according to claim 1, in which a third valve and a connecting pipe are provided enabling the first and second connections to be connected together. ### Claim 6 (depends on 5) The flushing machine according to claim 5, in which a shutoff valve is provided to isolate the at least one magnetic filter and the pump in a bypass mode. ### Claim 7 (depends on 1) The flushing machine according to claim 1, in which a fourth valve is provided for diverting an outlet flow from the at least one magnetic filter to a drain outlet. ### Claim 8 (depends on 1) The flushing machine according to claim 1, in which a mains water connection is provided for connecting to a mains water supply. ### Claim 9 (depends on 8) The flushing machine according to claim 8, in which a double check valve is positioned adjacent the mains water connection for preventing backflow into the mains water supply. ### Claim 10 (depends on 1) The flushing machine according to claim 1, in which the or each valve means is electrically operated. ### Claim 11 (depends on 10) The flushing machine according to claim 10, in which a control unit is provided for operation of the valve means. ### Claim 12 (depends on 11) The flushing machine according to claim 11, in which the valve means is operated automatically on selection of a mode of operation. ### Claim 13 (depends on 12) The flushing machine according to claim 12, in which the flow direction through the first and second connections is changed automatically during a power flush. ### Claim 14 (depends on 12) The flushing machine according to claim 12, in which a magnetite sensor is provided on the or each magnetic filter. ### Claim 15 (depends on 14) The flushing machine according to claim 14, in which there are two magnetic filters connected in series and in which a magnetite sensor is provided on only the first filter in a flow path before the pump. ### Claim 16 (depends on 14) The flushing machine according to claim 14, in which the control unit is configured to automatically shut down the pump to stop power flushing when the magnetite sensor detects a predetermined level of magnetite in the filter. ### Claim 17 (depends on 1) The flushing machine according to claim 1, in which the flushing machine does not include a holding tank for flushing water. ### Claim 18 (depends on 1) A method of flushing using a flushing machine according to claim 1, comprising passing flushing water through a central heating circuit in one direction and then in another direction. ### Claim 19 (depends on 1) A flushing machine according to claim 1, in which the valve means includes at least two 2-way valves, in which a third valve and a connecting pipe are provided enabling the first and second connections to be connected together, in which a shutoff valve is provided to isolate the at least one magnetic filter and the pump in a bypass mode, in which a fourth valve is provided for diverting an outlet flow from the at least one magnetic filter to a drain outlet, and in which a double check valve is positioned adjacent the mains water connection for preventing backflow into the mains water supply, in which the operation of each of the two 2-way valves, the third valve, the shut off valve, the fourth valve, and the double check valve are electrically operated. ### Claim 20 (depends on 19) A flushing machine according to claim 19, in which a control unit is provided for operation of each of the two 2-way valves, the third valve, the shut off valve, the fourth valve, and the double check valve.