An expansion valve includes: a main body portion having a valve chamber and a valve seat; a valve body configured for moving forward and backward relative to the valve seat; a case fixed to the main body portion; an excitation portion; a rotor that is driven to rotate by the excitation portion; and a forward and backward moving mechanism that converts a rotational movement of the rotor into a linear movement to move the valve body forward and backward. The valve chamber has a bellows housed therein externally mounted on the valve body and configured for expanding and contracting in association with the forward and backward movement of the valve body, and a space between the bellows and the valve body is held in a vacuum state.

An expansion valve includes: a main body portion having a valve chamber and a valve seat; a valve body configured for moving forward and backward relative to the valve seat; a case fixed to the main body portion; an excitation portion; a rotor that is driven to rotate by the excitation portion; and a forward and backward moving mechanism that converts a rotational movement of the rotor into a linear movement to move the valve body forward and backward. The valve chamber has a bellows housed therein externally mounted on the valve body and configured for expanding and contracting in association with the forward and backward movement of the valve body, and a space between the bellows and the valve body is held in a vacuum state.

A heat pump system provides at least six modes of heating, cooling, and/or domestic water heating operation, where domestic water heating may occur concurrently with heating or cooling a space in a structure. The heat pump system comprises a desuperheater positioned downstream of the compressor and operable as a desuperheater, a condenser or an evaporator, a source heat exchanger operable as either a condenser or an evaporator, a load heat exchanger operable as either a condenser or an evaporator, a reversing valve positioned downstream of the desuperheater heat exchanger and configured to alternately direct refrigerant flow from the desuperheater heat exchanger to one of the load heat exchanger and the source heat exchanger and to alternately return refrigerant flow from the other of the load heat exchanger and the source heat exchanger to the compressor, and an expansion valve positioned between the load heat exchanger and the source heat exchanger.

A heat pump system provides at least six modes of heating, cooling, and/or domestic water heating operation, where domestic water heating may occur concurrently with heating or cooling a space in a structure. The heat pump system comprises a desuperheater positioned downstream of the compressor and operable as a desuperheater, a condenser or an evaporator, a source heat exchanger operable as either a condenser or an evaporator, a load heat exchanger operable as either a condenser or an evaporator, a reversing valve positioned downstream of the desuperheater heat exchanger and configured to alternately direct refrigerant flow from the desuperheater heat exchanger to one of the load heat exchanger and the source heat exchanger and to alternately return refrigerant flow from the other of the load heat exchanger and the source heat exchanger to the compressor, and an expansion valve positioned between the load heat exchanger and the source heat exchanger.

A block fitting assembly includes a first block, a second block, and a first sealing element disposed between the first block and the second block. A clamping device applies a clamping force for compressing the first sealing element between the first block and the second block in an axial direction of the block fitting assembly. A first heel structure projects axially from one of the first block or the second block and projects towards the other of the first block or the second block. The first heel structure is configured to be spaced apart from or to contact the other of the first block or the second block depending on a temperature of the first block.

An electronic expansion valve including a rotor, a stator and a circuit board the rotor includes a permanent magnet, and the permanent magnet includes at least two pairs of magnetic poles; the stator includes a coil and a bobbin, wherein the coil is supported by the bobbin, and the bobbin is disposed at the periphery of the permanent magnet. Also included is a Hall sensor, which is disposed on the periphery of the permanent magnet; the Hall sensor and the coil are electrically connected to the circuit board; the Hall sensor includes a sensing portion, and the sensing portion is used for sensing magnetic pole change of the permanent magnet; the sensing portion is always located between the two ends of the permanent magnet during the entire operating process of the rotor.

An electronic expansion valve including a rotor, a stator and a circuit board the rotor includes a permanent magnet, and the permanent magnet includes at least two pairs of magnetic poles; the stator includes a coil and a bobbin, wherein the coil is supported by the bobbin, and the bobbin is disposed at the periphery of the permanent magnet. Also included is a Hall sensor, which is disposed on the periphery of the permanent magnet; the Hall sensor and the coil are electrically connected to the circuit board; the Hall sensor includes a sensing portion, and the sensing portion is used for sensing magnetic pole change of the permanent magnet; the sensing portion is always located between the two ends of the permanent magnet during the entire operating process of the rotor.

Some embodiments of the present invention provide an electronic expansion valve and assembling method of electronic expansion valve, the electronic expansion valve includes: a housing; a guide sleeve; a screw; a rotor being drivingly connected with the screw; and a valve needle assembly movably disposed in the housing, one end of the screw being connected with the valve needle assembly so as to drive the valve needle assembly to move axially by means of the screw. A guide segment and a press-fit segment which are in communication with each other are disposed between an inner wall of the housing and an outer wall of the guide sleeve, a spacing between the guide sleeve and the housing located on the guide segment is greater than a spacing between the guide sleeve and the housing located on the press-fit segment.

Some embodiments of the present invention provide an electronic expansion valve and assembling method of electronic expansion valve, the electronic expansion valve includes: a housing; a guide sleeve; a screw; a rotor being drivingly connected with the screw; and a valve needle assembly movably disposed in the housing, one end of the screw being connected with the valve needle assembly so as to drive the valve needle assembly to move axially by means of the screw. A guide segment and a press-fit segment which are in communication with each other are disposed between an inner wall of the housing and an outer wall of the guide sleeve, a spacing between the guide sleeve and the housing located on the guide segment is greater than a spacing between the guide sleeve and the housing located on the press-fit segment.

An electronic expansion valve comprises: a valve body, the valve body comprising a main body section, an extension section, and a step section, wherein a valve seat core being in a tubular shape and having openings at two ends, wherein the valve seat core comprises a tubular body and a limiting step formed at one end of the tubular body, the tubular body penetrates through the extension section, the limiting step abuts against the inner wall of the step section, and one end of the tubular body away from the limiting step extends out of the extension section; and an air outlet pipe, which is sleeved in the extension section and abuts against an outer wall of the step section, a groove is defined by an inner wall of the air outlet pipe, the extension section, and an outer wall of the tubular body in a surrounding mode.