# US 11,112,152 B2 · System design for noise reduction of solenoid valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,152 B2 - Document ID: US11112152B2 - Status: Granted - Kind: B2 - Application number: 16/354,377 - Filed: 2019-03-15 - Published: 2019-07-11 - Granted: 2021-09-07 - Earliest claimed: 2017-03-10 - Assignees: Lennox Industries Inc. - Applicants: Lennox Industries Inc. - Inventors: Brandon Ullrich; Ammar Kailani - Web page: https://patentgrep.com/patent/US11112152B2 ## CPC - F16L 55/02718: {placed transversely} - F25B 41/20: Disposition of valves, e.g. of on-off valves or flow control valves (expansion valves F25B41/31) - F25B 49/02: for compression type machines, plants or systems - F25B 2400/0401: for compressors - F25B 2400/0409: for evaporators - F25B 2500/07: Exceeding a certain pressure value in a refrigeration component or cycle - F25B 2500/12: Sound - F25B 2500/26: characterised by the startup of the refrigeration cycle - F25B 2500/27: characterised by the stop of the refrigeration cycle - F25B 2600/2501: Bypass valves - F25B 2700/191: near an expansion valve - F25B 2700/1931: Discharge pressures - F25B 2700/1933: Suction pressures - F25B 2700/195: of the condenser - F25B 2700/197: of the evaporator - F25B 2700/21151: at the suction side of the compressor - F25B 2700/21152: at the discharge side of the compressor - F25B 2700/21163: of the refrigerant at the outlet of the condenser - F25B 2700/21175: of the refrigerant at the outlet of the evaporator - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS ## Abstract A bypass line is described that is capable of equalizing pressure within an HVAC system. The bypass line can also cause less noise than other solutions. A bypass line under the present disclosure can comprise a line from a high pressure side to a low pressure side of an HVAC system. Valves and orifices can be disposed within the bypass line. The valves and orifices help to slow the speed of fluid from high pressure to low pressure locations, thus reducing noise during pressure equalization. ## Claims ### Claim 1 A bypass line within a heating, ventilation, and air conditioning (HVAC) system comprising: a fluid line connected to a high pressure side of a compressor and a low pressure side of the compressor of the HVAC system; a valve within the fluid line disposed between the high pressure side and the low pressure side; an orifice disposed within the fluid line and arranged upstream from the valve in a refrigerant flow direction, wherein the orifice comprises a diameter that is smaller than a diameter of the fluid line, wherein a first end of the orifice is directly connected to the high pressure side of the compressor and a second end of the orifice is directly connected to the valve; wherein, when the valve is open, refrigerant flows through the fluid line from the high pressure side to the low pressure side via the orifice and the valve, wherein the refrigerant contacts the orifice prior to contacting the valve; wherein flow of refrigerant from a high pressure side of the orifice is initially slowed upon contact with the orifice; and wherein the flow of refrigerant from a high pressure side of the valve is subsequently slowed upon contact with the valve. ### Claim 2 (depends on 1) The bypass line of claim 1, wherein, when the valve is closed, the refrigerant ceases to flow through the fluid line from the high pressure side to the low pressure side. ### Claim 3 (depends on 1) The bypass line of claim 1, wherein the valve is arranged downstream from the high pressure side in the refrigerant flow direction. ### Claim 4 (depends on 1) The bypass line of claim 1, wherein the orifice and the valve are each configured to slow the flow of refrigerant. ### Claim 5 (depends on 1) The bypass line of claim 1, wherein the valve is coupled to a controller configured to open and close the valve. ### Claim 6 (depends on 5) The bypass line of claim 5, wherein one or more sensors are coupled to the controller. ### Claim 7 (depends on 5) The bypass line of claim 5 wherein the controller is operable to open the valve when the HVAC system powers down. ### Claim 8 (depends on 5) The bypass line of claim 5 wherein the controller comprises a connection to one or more sensors. ### Claim 9 (depends on 8) The bypass line of claim 8, wherein the controller is operable to open and close the valve based at least in part on a measurement from the one or more sensors. ### Claim 10 (depends on 1) The bypass line of claim 1, wherein the valve is coupled to a pressure switch, wherein when a pressure reaches a predetermined value the pressure switch opens the valve. ### Claim 11 (depends on 1) The bypass line of claim 1, wherein the valve is coupled to a temperature switch, wherein when a temperature reaches a predetermined value the temperature switch opens the valve. ### Claim 12 A method of equalizing pressure within a heating, ventilation, and air conditioning (HVAC) system comprising: connecting a high pressure side of a compressor to a lower pressure side of the compressor of the HVAC system using a bypass line; receiving a request for pressure equalization in the HVAC system; opening a valve within the bypass line so that refrigerant flows from the high pressure side to the low pressure side; providing, within the bypass line, an orifice comprising a diameter that is smaller than a diameter of the bypass line, wherein the refrigerant contacts the orifice prior to contacting the valve, wherein a first end of the orifice is directly connected to the high pressure side of the compressor and a second end of the orifice is directly connected to the valve; wherein flow of refrigerant from a high pressure side of the orifice is initially slowed upon contact with the orifice; and wherein the flow of refrigerant from a high pressure side of the valve is subsequently slowed upon contact with the valve. ### Claim 13 (depends on 12) The method of claim 12, wherein the orifice is arranged upstream from the valve in a refrigerant flow direction. ### Claim 14 (depends on 13) The method of claim 13, wherein the valve is arranged downstream from the high pressure side in the refrigerant flow direction. ### Claim 15 (depends on 12) The method of claim 12 further comprising providing a second orifice within the bypass line. ### Claim 16 (depends on 12) The method of claim 12 further comprising providing a controller coupled to the valve and operable to open and close the valve. ### Claim 17 (depends on 16) The method of claim 16 further comprising providing one or more sensors coupled to the controller, wherein the controller opens and closes the valve base at least in part on a measurement from the one or more sensors. ### Claim 18 A heating, ventilation, and air conditioning (HVAC) system for circulating refrigerant, comprising: a condenser configured to condense at least a portion of the refrigerant; an expansion device configured to receive the refrigerant from the condenser; an evaporator coil configured to receive the refrigerant from the expansion device; a compressor configured to receive the refrigerant from the evaporator coil; and a bypass line connecting a high and low pressure sides of the HVAC system, the bypass line comprising; a fluid line connected to a high pressure side of the compressor and a low pressure side of the compressor of the HVAC system; a valve within the fluid line disposed between the high pressure side and the low pressure side; an orifice disposed within the fluid line and arranged upstream from the valve in a refrigerant flow direction, wherein the orifice comprises a diameter that is smaller than a diameter of the fluid line, wherein a first end of the orifice is directly connected to the high pressure side of the compressor and a second end of the orifice is directly connected to the valve; wherein, when the valve is open, refrigerant flows through the fluid line from the high pressure side to the low pressure side via the orifice and the valve, wherein the refrigerant contacts the orifice prior to contacting the valve; wherein flow of refrigerant from a high pressure side of the orifice is initially slowed upon contact with the orifice; and wherein the flow of refrigerant from a high pressure side of the valve is subsequently slowed upon contact with the valve. ### Claim 19 (depends on 18) The HVAC system of claim 18, wherein, when the valve is closed, the refrigerant ceases to flow through the fluid line from the high pressure side to the low pressure side. ### Claim 20 (depends on 18) The HVAC system of claim 18, wherein the valve is arranged downstream from the high pressure side in the refrigerant flow direction.