A vapor compression method and system including: a compressor configured to circulate a working fluid and operate at a plurality of operating conditions; an evaporator in fluid communication with the compressor, the evaporator heat exchanger comprising: a shell configured to allow the working fluid to flow therethrough; a plurality of parallel-spaced tubes disposed within the shell, the plurality of parallel spaced tubes configured to allow a heat transfer fluid to flow therethrough; and at least one baffle operably coupled to the plurality of parallel-spaced tubes, the at least one baffle configured to divide the shell into at least two chambers; an expansion valve assembly in fluid communication with the evaporator; and a control device operably coupled to the compressor and the expansion valve assembly, the control device configured to operate the valve assembly based at least in part on the plurality of operating conditions.

A refrigerant metering system/method incorporating a manual expansion valve (MEV), condenser isolation valve (CIV), flow isolation valve (FIV), and evaporator isolation valve (EIV) is disclosed. The MEV is configured to replace a conventional automated expansion valve (AEV) that controls a refrigerant flow valve (RFV) that is positioned in a heating, ventilation, and air conditioning (HVAC) system between a refrigerant condenser coil (RCC) and a refrigerant evaporator coil (REC) and permits manual metering of refrigerant by the RFV from the RCC to the REC and also allows complete shutoff of refrigerant flow by the RFV from the RCC to the REC. The MEV allows rapid HVAC repair and restoration of service where a replacement AEV is not readily available. The CIV/FIV/EIV are positioned in the refrigerant flow lines to permit the AEV and/or REC to be isolated from HVAC refrigerant flow for repairs to the AEV and/or REC.

A refrigerant metering system/method incorporating a manual expansion valve (MEV), condenser isolation valve (CIV), flow isolation valve (FIV), and evaporator isolation valve (EIV) is disclosed. The MEV is configured to replace a conventional automated expansion valve (AEV) that controls a refrigerant flow valve (RFV) that is positioned in a heating, ventilation, and air conditioning (HVAC) system between a refrigerant condenser coil (RCC) and a refrigerant evaporator coil (REC) and permits manual metering of refrigerant by the RFV from the RCC to the REC and also allows complete shutoff of refrigerant flow by the RFV from the RCC to the REC. The MEV allows rapid HVAC repair and restoration of service where a replacement AEV is not readily available. The CIV/FIV/EIV are positioned in the refrigerant flow lines to permit the AEV and/or REC to be isolated from HVAC refrigerant flow for repairs to the AEV and/or REC.

A refrigerant metering system/method incorporating a manual expansion valve (MEV), condenser isolation valve (CIV), flow isolation valve (FIV), and evaporator isolation valve (EIV) is disclosed. The MEV is configured to replace a conventional automated expansion valve (AEV) that controls a refrigerant flow valve (RFV) that is positioned in a heating, ventilation, and air conditioning (HVAC) system between a refrigerant condenser coil (RCC) and a refrigerant evaporator coil (REC) and permits manual metering of refrigerant by the RFV from the RCC to the REC and also allows complete shutoff of refrigerant flow by the RFV from the RCC to the REC. The MEV allows rapid HVAC repair and restoration of service where a replacement AEV is not readily available. The CIV/FIV/EIV are positioned in the refrigerant flow lines to permit the AEV and/or REC to be isolated from HVAC refrigerant flow for repairs to the AEV and/or REC.

A refrigerant metering system/method incorporating a manual expansion valve (MEV), condenser isolation valve (CIV), flow isolation valve (FIV), and evaporator isolation valve (EIV) is disclosed. The MEV is configured to replace a conventional automated expansion valve (AEV) that controls a refrigerant flow valve (RFV) that is positioned in a heating, ventilation, and air conditioning (HVAC) system between a refrigerant condenser coil (RCC) and a refrigerant evaporator coil (REC) and permits manual metering of refrigerant by the RFV from the RCC to the REC and also allows complete shutoff of refrigerant flow by the RFV from the RCC to the REC. The MEV allows rapid HVAC repair and restoration of service where a replacement AEV is not readily available. The CIV/FIV/EIV are positioned in the refrigerant flow lines to permit the AEV and/or REC to be isolated from HVAC refrigerant flow for repairs to the AEV and/or REC.

Disclosed is a nut assembly for an electronic expansion valve, an electronic expansion valve, and a limiting element mounting method. The nut assembly comprises a nut base, having a first end and a second end opposite to each other; a stop guide rail, sleeved on the nut base; a check ring, sleeved on the nut base and capable of helically rotating with respect to the nut base along the stop guide rail; and a limiting element, provided at the first end of the nut base The limiting element mounting method comprises the following steps: enabling the limiting element to be sleeved on the nut base, and enabling a second limiting boss to extend from a groove opening of a first limiting groove into the first limiting groove; and enabling, by means of the limiting element, the second limiting boss to slide into a corresponding second limiting groove.

A valve includes a movable valve member movable relative to a valve port between a closed position in which fluid flow through the valve port is inhibited and an open position in which fluid flow through the valve port is permitted. A valve seat is coupled to the movable valve member. The valve seat is configured to seat against and seal the valve port when the movable valve member is in the closed position and to be spaced apart from the valve port when the valve member is in the open position. A sealing member is disposed within a cavity behind the valve seat.

An electronic expansion valve and an assembly method therefor. The electronic expansion valve includes a screw rod component, a movable connection component, a valve pin component and an elastic element. One end of the elastic element abuts the movable connection component, and the other end thereof abuts the valve pin component. In the period from the valve pin component closing the valve port part to the screw rod component moving a pre-set displacement amount in the valve closing direction, the elastic element does not generate an elastic force pushing the valve pin component towards the valve port part; and in the period from the valve pin component closing the valve port part to in a case that the screw rod component moving more than the pre-set displacement amount in the valve closing direction, the elastic element generates an elastic force pushing the valve pin component towards the valve port part.

A valve drive device comprising a valve body drive mechanism including a drive gear, a driven gear for turning the valve body, and a power transmission switching part provided with a protruded part of the drive gear and a turning restriction part turnably attached to the driven gear. The turning restriction part comprises a lever part urged with an urging force toward an outer side of the driven gear. The driven gear comprises a lever turning restriction part for restricting turning of the lever part and the lever part is structured to perform a contact operation with the protruded part and a separating operation separated from a contact position with the lever turning restriction part. The valve body drive mechanism further comprises a foreign matter entry restraining part which covers at least a part of a region formed between the lever part and the lever turning restriction part.

A heat pump system comprises: a main heat exchange circuit, comprising a two-stage compressor (100a,100b), a condenser (200), a throttle element (300a,300b) and an evaporator (400), which are connected in sequence to form a circuit; an economizer, disposed between the condenser and the evaporator; a gas supplement branch, connecting a gas outlet of the economizer to a gas supplement port of the compressor, with an economizer regulating valve (600) for controlling the opening and closing of a flow path being arranged on the gas supplement branch; and a control device, wherein the control device controls the opening and closing of the economizer regulating valve based on a refrigerant state feature in the evaporator during a start-up stage of the heat pump system.