CN217502604U

CN217502604U - Electronic expansion valve

Info

Publication number: CN217502604U
Application number: CN202221509908.1U
Authority: CN
Inventors: 陈超; 刘文金; 唐文博; 杨茂
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2022-09-27
Anticipated expiration: 2032-06-16

Abstract

The utility model discloses an electronic expansion valve, which comprises a valve seat, a valve port component, a first connecting pipe, a groove and a welding flux; one end of the valve seat is provided with a port; the valve port assembly is arranged at the port and comprises a positioning section and an extension section, wherein the positioning section is provided with a first abutting surface abutting against the inner wall of the valve seat and a second abutting surface connected with the outer wall of the extension section; one end of the first connecting pipe extends between the inner wall of the port and the outer wall of the extension section and is abutted against the second abutting surface, and a first gap is formed between the outer wall of the first connecting pipe and the inner wall of the valve seat; the groove is arranged on the first abutting surface and communicated with the first gap; and the solder is arranged in the groove. The utility model discloses the design of electron expansion valve disk seat and the components of a whole that can function independently of valve port subassembly can reduce the processing degree of difficulty of disk seat and valve port subassembly.

Description

Electronic expansion valve

Technical Field

The utility model relates to a fluid control part technical field, in particular to electronic expansion valve.

Background

The electronic expansion valve is an important part in a refrigeration system and mainly plays roles in throttling, reducing pressure and regulating flow. In the related art, an electronic expansion valve includes a valve seat, a nut, and a valve needle assembly in threaded engagement with the nut, and a driving device drives the valve needle assembly to generate axial movement to adjust the opening of a valve port, thereby implementing circulation control. The valve seat and the valve port component of the existing electronic expansion valve are generally integrally formed, the processing difficulty is high, and internal leakage is easy to occur.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing an electronic expansion valve, aim at reducing the processing degree of difficulty of disk seat and valve port subassembly.

In order to achieve the above object, the present invention provides an electronic expansion valve, including:

a valve seat having a port formed at one end;

the valve port assembly is arranged on the port and comprises a positioning section and an extension section, wherein the positioning section is provided with a first abutting surface abutting against the inner wall of the valve seat and a second abutting surface connected with the outer wall of the extension section;

one end of the first connecting pipe extends into the space between the inner wall of the port and the outer wall of the extension section and is abutted against the second abutting surface, and a first gap is formed between the outer wall of the first connecting pipe and the inner wall of the valve seat;

the groove is arranged on the first abutting surface and communicated with the first gap; and the solder is arranged in the groove.

In an embodiment, the first gap is less than 0.2 mm.

In one embodiment, the length of the first nozzle extending into the port is greater than 1 mm.

In one embodiment, the distance between the outer wall of the extension section and the inner wall of the first connecting pipe is greater than 0.2 mm.

In an embodiment, the groove is disposed at a boundary between the first abutting surface and the second abutting surface.

In one embodiment, the inner wall of the valve seat is provided with a step surface, and one side of the positioning section, which is away from the second abutting surface, abuts against the step surface.

In one embodiment, the solder is annularly disposed.

In one embodiment, the electronic expansion valve further comprises a valve needle assembly having a valve port, and the valve needle assembly is movably disposed on the valve seat to open or close the valve port.

In an embodiment, the electronic expansion valve further includes an outer shell, and the outer shell is connected to an end of the valve seat far away from the first connecting pipe and forms a receiving cavity for receiving the valve needle assembly.

In an embodiment, the electronic expansion valve further includes a nut component and a rotor component disposed in the accommodating cavity, the rotor component is connected to the valve needle component, and the nut component is in threaded connection with the valve needle component.

The electronic expansion valve of the utility model comprises a valve seat, a valve port component, a first connecting pipe, a groove and a welding flux; one end of the valve seat is provided with a port; the valve port component is arranged at the port and comprises a positioning section and an extension section, the extension section is connected with the positioning section, and the positioning section is provided with a first abutting surface abutting against the inner wall of the valve seat and a second abutting surface connecting the first abutting surface and the outer wall of the extension section; one end of the first connecting pipe extends between the inner wall of the port and the outer wall of the extension section and is abutted against the second abutting surface, and a first gap is formed between the outer wall of the first connecting pipe and the inner wall of the valve seat; the groove is arranged on the first abutting surface and communicated with the first gap; and the solder is arranged in the groove. The valve seat, the valve port assembly and the first connecting pipe are welded together through the tunnel furnace, the welding flux is melted during welding, and the welding flux fills a first gap between the valve seat and the first connecting pipe through capillary action, so that the valve seat, the valve port assembly and the first connecting pipe are fixedly connected. The utility model discloses electronic expansion valve's disk seat and valve port subassembly components of a whole that can function independently design, the disk seat can standardize, does benefit to parts machining such as valve port subassembly, disk seat, reduces the processing degree of difficulty, improves the internal leakage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of an electronic expansion valve according to the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is a schematic diagram of a portion of the electronic expansion valve of FIG. 1;

fig. 4 is a schematic structural diagram of a valve port assembly of the electronic expansion valve of fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Electronic expansion valve	212	Second abutting surface
100	Valve seat	220	Extension section
				110	Port(s)	230	Valve port
120	Step surface	300	First connecting pipe
				130	Connecting port	400	First gap
140	Valve cavity	500	Groove
				200	Valve port assembly	600	Solder
210	Positioning section	700	Second connecting pipe
				211	First abutting surface

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an embodiment of electronic expansion valve 10, electronic expansion valve 10 is an important part among the refrigerating system, mainly plays the effect of throttle step-down and regulation flow. The conventional electronic expansion valve 10 includes a valve seat 100, a nut, and a valve needle assembly in threaded engagement with the nut, and the valve needle assembly is driven by a driving device to move axially to adjust the opening of a valve port 230, thereby implementing circulation control. The valve seat 100, the valve port assembly 200 and the first adapter tube 300 of the electronic expansion valve of the present embodiment are welded together in a tunnel furnace, the solder 600 is melted during welding, and the solder 600 fills the first gap 400 between the valve seat 100 and the first adapter tube 300 by capillary action, thereby realizing the fixed connection of the valve seat 100, the valve port assembly 200 and the first adapter tube 300. The valve seat 100 and the valve port assembly 200 are designed separately, and the valve seat 100 can be standardized, thereby being beneficial to processing parts such as the valve port assembly 200, the valve seat 100 and the like, reducing the processing difficulty and improving the internal leakage. And the solder 600 flows out from the first gap 400 between the first adapter tube 300 and the valve seat 100 after melting, the quality after welding can be checked and controlled by the flowing-out condition of the solder 600, and whether the first gap 400 is filled with the solder 600 is judged.

The utility model discloses an electronic expansion valve 10 can use in air conditioning system, and the fluid medium that flows through electronic expansion valve 10 is the refrigerant that is used for carrying out the cold and heat exchange among the air conditioning system. At this time, the electronic expansion valve 10 is installed at an inlet of an evaporator of the air conditioning system, and the electronic expansion valve 10 serves as a boundary element between a high pressure side and a low pressure side of the air conditioning system, and throttles and reduces the pressure of the high-pressure liquid refrigerant from a receiver drier and other devices, so as to adjust and control the dosage of the liquid refrigerant entering the evaporator, and enable the dosage of the liquid refrigerant to be suitable for the requirement of an external refrigeration load. Alternatively, the electronic expansion valve 10 is applied to other types of refrigeration equipment, and the fluid medium flowing through the electronic expansion valve 10 may also be another fluid medium other than the refrigerant, as long as the electronic expansion valve 10 can throttle and depressurize the fluid medium, which is not particularly limited.

Referring to fig. 1 to 4, in an embodiment of the present invention, the electronic expansion valve 10 includes a valve seat 100, a valve port assembly 200, a first connection pipe 300, a groove 500, and a solder 600; a port 110 is formed at one end of the valve seat 100; the valve port assembly 200 is disposed at the port 110, the valve port assembly 200 includes a positioning section 210 and an extension section 220, the positioning section 210 has a first abutment surface 211 abutting against the inner wall of the valve seat 100, and a second abutment surface 212 connecting with the outer wall of the extension section 220; one end of the first adapter tube 300 extends into the space between the inner wall of the port 110 and the outer wall of the extension section 220, and abuts against the second abutting surface 212, and a first gap 400 is formed between the outer wall of the first adapter tube 300 and the inner wall of the valve seat 100; the groove 500 is disposed on the first abutting surface 211, and the groove 500 is communicated with the first gap 400; the solder 600 is disposed in the groove 500.

Specifically, the valve seat 100 is machined from a stainless steel material, and the valve seat 100 is disposed in a substantially cylindrical shape. It is understood that in other embodiments, the valve seat 100 may be made of other materials, and that the valve seat 100 may have other shapes than a cylinder.

The valve port assembly 200 is disposed at the port 110, the valve port assembly 200 has a valve port 230, one end of the first adapter tube 300 extends between the inner wall of the port 110 and the outer wall of the extension section 220, and abuts against the second abutment surface 212, and meanwhile, a first gap 400 is formed between the outer wall of the first adapter tube 300 and the inner wall of the port 110. The electronic expansion valve 10 further includes a second connection pipe 700, the valve seat 100 is provided with a connection port 130, the second connection pipe 700 is disposed at the connection port 130, a valve cavity 140 is formed in the valve seat 100, and the connection port 130 and the valve port 230 can be communicated through the valve cavity 140. Fluid medium may flow into the valve chamber 140 from either the connection port 130 or the valve port 230 and out the other port. In the present embodiment, the fluid medium flows into the electronic expansion valve 10 from the second connection pipe 700, and flows out from the first connection pipe 300, i.e., flows into the valve chamber 140 from the connection port 130, and flows out through the valve port 230. Meanwhile, the valve seat 100 and the valve port assembly 200 of the electronic expansion valve 10 of the present embodiment are designed separately, which is beneficial to the processing of the valve port assembly 200, the valve seat 100 and other parts, reduces the processing difficulty, and can improve the internal leakage problem of the electronic expansion valve 10.

The groove 500 may be opened on the first abutting surface 211 and communicated with the first gap 400 through a gap between the first abutting surface 211 and the inner wall of the valve seat 100, the groove 500 may also be opened on a joint between the first abutting surface 211 and the second abutting surface 212 and directly communicated with the first gap 400, a specific position of the groove 500 is not limited, and the position of the groove 500 may be any position as long as it can be communicated with the first gap 400.

In this embodiment, the material of the valve seat 100 is a stainless steel material, and the material of the first adapter 300 is a copper material, but in other embodiments, the materials of the valve seat 100 and the first adapter 300 may be other materials, and this is not particularly limited. In general, when the first adapter tube 300 and the valve seat 100 are welded together, since the copper material has a higher expansion coefficient than the stainless material, a gap is formed at the joint of the first adapter tube 300 and the valve seat 100 (i.e., at the first gap 400) after heating, and therefore, it is necessary to make the melted solder 600 flow into the gap to fill the gap, and solidify after cooling, so as to weld the first adapter tube 300 and the valve seat 100 together. Of course, in other embodiments, when the valve seat 100 and the first adapter tube 300 are made of other materials, the joint between the first adapter tube 300 and the valve seat 100 may be configured to have a gap after the assembly is completed, and the melted solder 600 flows into the gap to fill the gap, and solidifies after cooling, so as to function to weld the first adapter tube 300 and the valve seat 100 together.

Referring to fig. 1 to 4, the solder 600 is disposed in the groove 500, and specifically, when the first adapter tube 300 and the valve seat 100 are soldered, the solder 600 flows into the first gap 400 by capillary action after melting and flows out to the outer surface of the valve seat 100 along the first gap 400, so that an operator can visually observe the flowing-out condition of the solder 600, thereby facilitating manual quality inspection and control after soldering, and then, after the solder 600 is cooled, the first adapter tube 300 and the valve seat 100 are soldered together, and the whole soldering process is completed. The capillary action refers to a phenomenon in which the infiltrating liquid rises in a thin tube. Capillary action occurs essentially because of capillary forces-a very thin tube is inserted into the water, a concave surface is formed in the tube due to wetting, and the middle concave surface pulls the water below upward due to the tendency of the liquid surface to flatten out automatically, which is the capillary force.

The electronic expansion valve 10 of the present invention comprises a valve seat 100, a valve port assembly 200, a first connecting pipe 300, a groove 500 and a solder 600; a port 110 is formed at one end of the valve seat 100; the valve port assembly 200 is disposed at the port 110, the valve port assembly 200 includes a positioning section 210 and an extension section 220, the positioning section 210 has a first abutting surface 211 abutting against the inner wall of the valve seat 100, and a second abutting surface 212 connecting with the outer wall of the extension section 220; one end of the first adapter tube 300 extends between the inner wall of the port 110 and the outer wall of the extension section 220 and abuts against the second abutting surface 212, and a first gap 400 is formed between the outer wall of the first adapter tube 300 and the inner wall of the valve seat 100; the groove 500 is arranged on the first abutting surface 211, and the groove 500 is communicated with the first gap 400; and solder 600 is disposed in the recess 500. The valve seat 100 and the valve port assembly 200 of the electronic expansion valve of the embodiment are designed separately, and the valve seat 100 can be standardized, thereby facilitating the processing of parts such as the valve port assembly 200, the valve seat 100 and the like, reducing the processing difficulty and improving the internal leakage. And the solder 600 flows out from the first gap 400 between the first adapter tube 300 and the valve seat 100 after melting, the quality after welding can be checked and controlled by the flowing-out condition of the solder 600, and whether the first gap 400 is filled with the solder 600 is judged.

Referring to fig. 1 to 4, in an embodiment of the present invention, the first gap 400 is smaller than 0.2 mm. Specifically, in order to ensure that the solder 600 in the liquid state flows into the first gap 400 by capillary action and flows out to the outer surface of the valve seat 100 along the first gap 400 when the solder 600 is melted into the liquid state, so that the outflow of the solder 600 can be observed by the naked eye of the operator, it is necessary to ensure the gap size of the first gap 400, and preferably, the first gap 400 is less than 0.2 mm.

Referring to fig. 2, in an embodiment of the present invention, the length of the first connection pipe 300 extending into the port 110 is greater than 1 mm. Specifically, the length of the first adapter tube 300 inserted into the first end is set to be D, and in order to ensure the stability and the firmness of the welding between the first adapter tube 300 and the valve seat 100, the length D of the first adapter tube 300 extending into the port 110 should be kept to be D > 1 mm. Meanwhile, since the amount of the solder 600 is constant, the length D of the first adapter tube 300 extending into the port 110 is not too long, which is determined according to practical situations and is not particularly limited.

Referring to fig. 1, in an embodiment of the present invention, a distance between an outer wall of the extension section 220 and an inner wall of the first connection pipe 300 is greater than 0.2 mm. Specifically, in order to prevent the solder 600 from flowing between the outer wall of the extension part 220 and the inner wall of the first adapter tube 300 after melting and not flowing into the first gap 400 by capillary action, it is necessary to set the distance between the outer wall of the extension part 220 and the inner wall of the first adapter tube 300 to be greater than the distance of the first gap 400, that is, the distance between the outer wall of the extension part 220 and the inner wall of the first adapter tube 300 to be greater than 0.2mm, so as to ensure that the melted solder 600 can flow into the first gap 400 by capillary action.

Referring to fig. 1, fig. 2 and fig. 4, in an embodiment of the present invention, the groove 500 is disposed at a boundary between the first abutting surface 211 and the second abutting surface 212. In this embodiment, the groove 500 can directly communicate with the first gap 400 without passing through a gap between the first abutting surface 211 and the inner wall of the valve seat 100, so that the positioning section 210 of the valve seat 100 assembly can be in clearance fit with the inner wall of the valve seat 100 and also in interference fit with the inner wall of the valve seat 100, thereby preventing the valve port assembly 200 from sliding into the valve cavity 140 during installation and being instably installed when the diameter of the port 110 is the same as the diameter of the valve cavity 140.

Referring to fig. 1 to 4, in another embodiment of the present invention, the inner wall of the valve seat 100 is provided with a step surface 120, and one side of the positioning section 210 departing from the second abutting surface 212 abuts against the step surface 120. Specifically, the step surface 120 is attached to a side of the positioning section 210 of the valve port assembly 200 away from the second abutting surface 212, so as to facilitate installation of the valve port assembly 200, to enable the installation position of the valve port assembly 200 to be accurate, and to prevent the valve port assembly 200 from sliding into the valve cavity 140 during installation and being instable when the diameter of the port 110 is the same as the diameter of the valve cavity 140.

In an embodiment of the present invention, the solder 600 is disposed in a ring shape. Specifically, the solder 600 is shaped in a circular ring. Of course, in other embodiments, the solder 600 may be disposed in a block shape, and the plurality of solders 600 are arranged at intervals along the circumferential direction of the valve port assembly 200, or the solder 600 may be disposed in a sphere shape, and the plurality of solders 600 are arranged at intervals along the circumferential direction of the valve port assembly 200, and the shape of the solder 600 has various designs, as long as the solder 600 can fully fill the gap between the outer wall surface of the first adapter tube 300 and the inner wall surface of the valve seat 100 when the valve seat 100 and the first adapter tube 300 are welded, which is not particularly limited.

In an embodiment of the present invention, the electronic expansion valve 10 further includes a valve needle assembly (not shown), the valve needle assembly 200 has a valve port 230, and the valve needle assembly is movably disposed on the valve seat 100 to open or close the valve port 230. A guide sleeve (not shown) is further disposed in the valve seat 100, and is fixedly mounted on the valve seat 100, and the guide sleeve is used for guiding the movement of the valve needle assembly. Specifically, the valve needle assembly is movably disposed on the valve seat 100 and passes through the guide sleeve to open or close the valve port 230, such that the first adapter 300 and the second adapter 700 are communicated or blocked. The valve needle assembly has a screw and a valve needle connected to the screw, and the valve needle assembly is mounted on the valve seat 100, and the valve needle passes through the guide sleeve to open or close the valve port 230. Further, the valve port 230 is communicated with the connection port 130, and the valve port 230 is used for the valve needle of the valve needle assembly to extend into, so as to block the fluid medium in the electronic expansion valve 10 from being discharged out through the valve port 230. When the valve needle assembly closes the valve port 230, that is, the connection port 130 and the valve port 230 are disconnected from each other, the electronic expansion valve 10 is closed, and the fluid medium cannot flow from the second connection pipe 700 to the first connection pipe 300; when the valve needle assembly unseals the valve port 230, that is, the connection port 130 and the valve port 230 communicate with each other, the electronic expansion valve 10 is opened, and the fluid medium can flow from the second connection pipe 700 to the first connection pipe 300. The guide sleeve may be integrally provided with the valve seat 100 or may be separately provided, which is not particularly limited.

In an embodiment of the present invention, the electronic expansion valve 10 further includes a housing (not shown), the housing is connected to an end of the valve seat 100 away from the first connecting pipe 300, and forms a receiving cavity for receiving the valve needle assembly. Specifically, the housing is substantially cylindrical, the housing is sleeved on an end of the valve seat 100 away from the valve cavity 140, and the housing and the valve seat 100 can be fixed by welding. The housing is connected with one end of the valve seat 100 far away from the valve cavity 140 and then encloses to form an accommodating cavity for accommodating the valve needle assembly, and the valve needle assembly is mounted on the valve seat 100 and is positioned in the accommodating cavity.

In an embodiment of the present invention, the electronic expansion valve 10 further includes a nut component (not shown) and a rotor component (not shown) disposed in the accommodating cavity, the rotor component is connected to the valve needle component, and the nut component is connected to the valve needle component by a thread. Specifically, the nut component is provided with a nut, the nut is in threaded connection with a screw rod of the valve needle component, the rotor component is fixedly connected with the screw rod, and due to the fact that the nut and the screw rod are in fit relation, the screw rod and the rotor component fixedly connected with the screw rod and the like can move in a telescopic mode along the axis direction of the screw rod, and therefore the moving process that the screw rod drives the valve needle component is achieved.

The working principle of the electronic expansion valve 10 is as follows:

the stator assembly generates a magnetic field after being electrified, the rotor made of magnetic materials rotates under the driving of the magnetic field, the rotor is fixedly connected with the screw rod, the rotation of the rotor drives the screw rod to rotate, a nut and screw rod matching relation is formed between the screw rod and the nut, and the nut assembly is fixedly arranged on the valve seat 100, so that the rotation of the screw rod relative to the nut drives the screw rod to move relative to the nut in a telescopic mode, the stator assembly drives the rotor assembly to move, and the rotor assembly drives the valve needle assembly to move;

the valve needle moves towards the valve port 230 under the driving of the screw rod, and when the valve needle closes the valve port 230, that is, the connection port 130 is disconnected from the valve port 230, the electronic expansion valve 10 is closed; when the valve needle releases the closure of the valve port 230, that is, the connection port 130 and the valve port 230 are communicated with each other, the electronic expansion valve 10 is opened, and because the opening caliber of the valve port 230 in the electronic expansion valve 10 is relatively small, the flow rate of the fluid medium is reduced, thereby implementing the process of throttling and depressurizing the fluid medium by the electronic expansion valve 10.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

a valve seat having a port formed at one end;

the groove is arranged on the first abutting surface and communicated with the first gap; and

and the solder is arranged in the groove.

2. The electronic expansion valve of claim 1, wherein the first gap is less than 0.2 mm.

3. The electronic expansion valve of claim 1, wherein the first nipple extends into the port over a length of more than 1 mm.

4. The electronic expansion valve of claim 1, wherein the distance between the outer wall of the extension section and the inner wall of the first nipple is greater than 0.2 mm.

5. The electronic expansion valve of claim 1, wherein the recess is provided at the interface of the first abutment surface and the second abutment surface.

6. The electronic expansion valve according to claim 1, wherein the inner wall of the valve seat is provided with a step surface, and a side of the positioning section facing away from the second abutment surface abuts against the step surface.

7. The electronic expansion valve according to any of claims 1 to 6, wherein the solder is annularly arranged.

8. The electronic expansion valve according to any of claims 1-6, further comprising a valve needle assembly having a valve port, the valve needle assembly being movably disposed at the valve seat for opening or closing the valve port.

9. The electronic expansion valve of claim 8, further comprising a housing coupled to an end of the valve seat remote from the first nozzle and defining a receiving chamber for receiving the valve needle assembly.

10. The electronic expansion valve of claim 9, further comprising a nut assembly and a rotor assembly disposed in the receiving chamber, the rotor assembly being coupled to the valve needle assembly, the nut assembly being threadably coupled to the valve needle assembly.