CN219263185U - Valve device - Google Patents

Abstract

The application discloses a valve device, which is provided with a valve chamber, wherein the valve device comprises a valve body, a valve port part and a valve core, and at least part of the valve chamber is positioned on the valve body; the valve port part is fixedly connected with the valve body or is of an integral structure, the valve port part is provided with a valve port, the valve port can be communicated with the valve chamber, the valve port comprises a first valve port section and a second valve port section along the extending direction of the valve port, the first valve port section is adjacent to the valve chamber relative to the second valve port section, and the inner diameter of the wall of the first valve port section is larger than the inner diameter of the wall of the second valve port section; at least part of the valve core is positioned in the valve chamber, the valve core can adjust the flow area of the first valve port section or the valve core can adjust the flow area of the second valve port section, and the cost of the valve device can be reduced.

Description

Valve device

Technical Field

The present application relates to the field of refrigeration, and in particular to a valve arrangement.

Background

The expansion valve is an important component of the refrigeration system, and has the functions of throttling, reducing pressure and regulating flow, and the opening degree of the expansion valve depends on the matching of the valve core and the valve port. The opening degree of the expansion valve required by different refrigeration systems may be different, the expansion valve needs to be redeveloped, or different expansion valves in the refrigeration systems need to be different, and if the expansion valve needs to be replaced, the expansion valve needs to be replaced integrally, so that the cost of the expansion valve is increased.

Disclosure of Invention

The present application provides a valve device that is advantageous in reducing the cost of the valve device.

In order to achieve the above object, one embodiment of the present application adopts the following technical scheme:

a valve device having a valve chamber, the valve device comprising:

a valve body, at least a portion of the valve chamber being located in the valve body;

the valve port part is fixedly connected with the valve body or is of an integral structure, the valve port part is provided with a valve port, the valve port can be communicated with the valve chamber, the valve port comprises a first valve port section and a second valve port section along the extending direction of the valve port, the first valve port section is adjacent to the valve chamber relative to the second valve port section, and the inner diameter of any part of the wall of the first valve port section is larger than the inner diameter of any part of the wall of the second valve port section;

and the valve core is at least partially positioned in the valve chamber, and can adjust the flow area of the first valve port section or the flow area of the second valve port section.

An embodiment of the application provides a valve device, the valve device includes valve body, valve port portion and case, the valve port in the valve port portion has first valve port section and second valve port section, the internal diameter of the wall of first valve port section is greater than the internal diameter of the wall of second valve port section, to the valve device of different aperture demands, can be through changing the case of equidimension for different cases can correspond with first valve port section or second valve port section, when satisfying the valve device of different aperture of production, only change the case, need not to change the valve port portion, thereby be favorable to reducing the cost of valve device.

Drawings

FIG. 1 is a schematic view of a valve device according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the valve assembly of FIG. 1 from another perspective;

FIG. 3 is a schematic view of the valve assembly of FIG. 1 from another perspective;

FIG. 4 is a cross-sectional view A-A of the valve assembly of FIG. 3;

FIG. 5 is an enlarged schematic view of the portion A in FIG. 4;

FIG. 6 is a view showing the structure of the valve body of FIG. 4;

FIG. 7 is a schematic view of the structure of the valve portion of FIG. 4;

FIG. 8 is a schematic view of a valve device according to an embodiment of the present disclosure;

FIG. 9 is a B-B cross-sectional view of the valve apparatus of FIG. 8;

FIG. 10 is an enlarged view of the portion B of FIG. 9;

FIG. 11 is a schematic structural view of a valve device according to another embodiment provided herein;

FIG. 12 is a C-C cross-sectional view of the valve apparatus of FIG. 11;

fig. 13 is an enlarged view of the C part in fig. 12.

Reference numerals in the drawings are described as follows:

100. a valve device; 101. a valve chamber; 102. a receiving chamber;

10. a valve body; 11. a first channel; 111. a first port; 112. a second port; 12. a second channel; 121. a third port; 122. a fourth port; 13. a mounting part; 131. a mounting groove; 132. an inner sidewall; 133. a bottom wall; 14. a communication passage; 141. a first communication port; 142. a second communication port; 15. a mounting cavity; 16. a third channel; 161. a fifth port; 162. a sixth port; 17. a connection hole; 171. a first duct; 172. a second orifice; 18. a receiving groove; 181. a mounting port;

20. a valve opening; 21. a valve port; 211. a first valve port segment; 212. a second valve port section; 213. a third section; 214. a fourth section; 215. a first section; 216. a second section;

30. a valve core assembly; 301. a valve core; 302. an arc surface; 31. a first valve core; 32. a valve core frame; 321. a second mating portion; 33. a second valve core;

40. a power assembly; 41. an upper cover; 42. a lower cover; 43. a membrane; 44. a transmission member; 45. a plug; 46. a first chamber; 47. a second chamber; 48. a first seal;

50. a valve stem assembly; 51. a valve stem; 511. a unit section; 52. a second seal ring; 53. a clamping piece;

60. an adjustment seat assembly; 61. an adjusting seat; 611. a first mating portion; 62. an elastic member; 63. and a third sealing ring.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

As shown in fig. 1 to 6, one embodiment of the present application provides a valve device 100, and the valve device 100 may be an expansion valve or the like; for example, the valve device 100 is a thermal expansion valve. The valve device 100 has a valve chamber 101; the valve device 100 includes a valve body 10, a power assembly 40, a valve stem assembly 50, a valve element assembly 30, and a valve port portion 20; at least part of the valve chamber 101 is positioned in the valve body 10, the valve body 10 is provided with a first channel 11 and a second channel 12, the valve port part 20 is connected with the valve body 10, the valve port part 20 is provided with a valve port 21, the valve port 21 can be communicated with the valve chamber 101, the first channel 11 is communicated with the valve chamber 101, and the second channel 12 can be communicated with the valve chamber 101 through the valve port 21; at least a portion of the cartridge assembly 30 is located in the valve chamber 101; the power assembly 40 is mounted to the valve body 10; the power assembly 40 can drive the valve core assembly 30 through the valve rod assembly 50, the valve core assembly 30 can be matched with the valve port 21, and the valve core assembly 30 can adjust the flow area of the valve port 21.

In the present embodiment, as shown in fig. 4 to 6, the structure of the valve body 10 is not strictly limited; for example, the valve body 10 has a prismatic shape. The first channel 11 has a first port 111 and a second port 112, and the second channel 12 has a third port 121 and a fourth port 122; the first port 111 is located on the outer side wall of the valve body 10, the second port 112 communicates with the valve chamber 101, the third port 121 is located on the outer side wall of the valve body 10, and the fourth port 122 can communicate with the valve chamber 101 through the valve port 21. Medium enters the first passage 11 from the first port 111, enters the valve chamber 101 through the second port 112, is throttled by the valve port 21, enters the second passage 12 through the fourth port 122, and finally exits through the third port 121. Of course, in other embodiments, the medium enters the second passage 12 from the third port 121, enters the valve port 21 through the fourth port 122, enters the valve chamber 101 after being throttled by the valve port 21, enters the first passage 11 through the second port 112, and exits through the first port 111. When the valve core assembly 30 closes the valve port 21, the first channel 11 is not communicated with the second channel 12; when the valve core assembly 30 opens the valve port 21, the first passage 11 and the second passage 12 communicate with each other. The valve body 10 also has a third passage 16, the third passage 16 having a fifth port 161 and a sixth port 162, the fifth port 161 and the sixth port 162 being located on the outer side wall of the valve body 10. Media enters the third channel 16 from the fifth port 161 and exits through the sixth port 162. Of course, in other embodiments, media enters the third channel 16 from the sixth port 162 and exits through the fifth port 161. Wherein the first port 111 and the fifth port 161 are located on the same side of the valve body 10, and the third port 121 and the sixth port 162 are located on the same side of the valve body 10. Of course, in other embodiments, the first port 111 and the fifth port 161 are located on different sides of the valve body 10, and the third port 121 and the sixth port 162 are located on different sides of the valve body 10.

In the present embodiment, as shown in fig. 4 to 6, the valve device 100 has a housing chamber 102, the housing chamber 102 communicating with the third passage 16; the power assembly 40 encloses at least a portion of the wall of the receiving chamber 102 with the valve body 10. Specifically, the valve body 10 is provided with a containing groove 18, the containing groove 18 is opened on the outer side wall of the valve body 10 and forms a mounting opening 181, the power assembly 40 is fixedly connected or in limited connection with the valve body 10, the power assembly 40 seals the mounting opening 181 of the containing groove 18, and at least part of the wall of the containing groove 18 and the power assembly 40 enclose at least part of the wall of the containing cavity 102. For example: the power assembly 40 is an air box head or a heat-sensitive bulb. When the power assembly 40 is an air box head, the air box head comprises an upper cover 41, a lower cover 42, a diaphragm 43 and a transmission member 44, wherein part of the lower cover 42 is positioned in the accommodating groove 18, the lower cover 42 and the valve body 10 are sealed and fixed in a threaded, welded and other modes, the outer periphery of the diaphragm 43 is positioned between the outer periphery of the lower cover 42 and the outer periphery of the upper cover 41, the diaphragm 43 and the lower cover 42 are fixed in a welded mode such as brazing, laser welding and argon arc welding, and the diaphragm 43 and the upper cover 41 are fixed in a welded mode such as brazing, laser welding and argon arc welding; a first airtight cavity 46 is formed between the upper cover 41 and the diaphragm 43, a second cavity 47 is formed between the lower cover 42 and the diaphragm 43, the second cavity 47 is communicated with the third channel 16, and medium in the third channel 16 can enter the second cavity 47; at least part of the transmission member 44 is located in the second cavity 47, the transmission member 44 is fixed or abutted with the diaphragm 43, and the transmission member 44 can slide in the second cavity 47; the transmission member 44 is in abutting or fixed connection with the valve stem assembly 50. For example: the driver 44 has a recess in which at least a portion of the valve stem assembly 50 is located. The first cavity 46 is filled with a temperature sensing medium, the temperature sensing medium can enable the diaphragm 43 to fluctuate according to temperature change, the displacement of the diaphragm 43 drives the transmission piece 44, and the transmission piece 44 drives the valve core assembly 30 through the valve rod assembly 50. The air box head further comprises a plug 45, and the upper cover 41 is provided with a filling opening which is communicated with the first cavity 46; the temperature sensing medium enters the first cavity 46 from the filling port, then the plug 45 is fixed on the upper cover 41 by welding modes such as laser welding, and the plug 45 seals the filling port. The plug 45 may be spherical, columnar, or trapezoidal in shape. A first seal 48 is provided between the lower cover 42 and the valve body 10 to enable enhanced sealability of the connection of the lower cover 42 and the valve body 10.

In this embodiment, as shown in fig. 4-6, the valve stem assembly 50 may transfer the movement of the diaphragm 43 to the valve cartridge assembly 30. The valve stem assembly 50 includes a valve stem 51, one end of the valve stem 51 is connected to the transmission member 44, and the other end of the valve stem 51 is connected to the valve cartridge assembly 30. It should be explained that: the end of the valve stem 51 may be an end face or one of the segments of the valve stem 51. The valve body 10 also has a connecting hole 17, and a portion of the valve stem 51 is located in the connecting hole 17. Wherein, when the part of the valve rod 51 is not placed in the connecting hole 17, the connecting hole 17 communicates with the second passage 12 and the third passage 16, respectively. One end portion of the valve stem 51 is located in the housing chamber 102, and the other end portion of the valve stem 51 extends into the valve chamber 101 through the third passage 16, the connection hole 17, the second passage 12, and the valve port 21. Along the axial direction of the valve stem 51, the connection hole 17 includes a first orifice 171 and a second orifice 172, the aperture of the first orifice 171 is larger than that of the second orifice 172, the first orifice 171 communicates with the third passage 16, and the second orifice 172 communicates with the valve chamber 101; a clamping piece 53 and a second sealing ring 52 are arranged between the valve rod 51 and the valve body 10, the clamping piece 53 is sleeved on the outer side of the valve rod 51, the second sealing ring 52 and the clamping piece 53 are both positioned in the first channel 171, the positions of the clamping piece 53 and the valve body 10 are relatively fixed, the clamping piece 53 limits the movement of the second sealing ring 52, the second sealing ring 52 can seal between the first channel 171 and the second channel 172, and the second sealing ring 52 can seal between the second channel 12 and the third channel 16. The valve stem 51 has a circular or polygonal cross section. The valve rod 51 is provided in one or more stages; when the valve rod 51 is provided in a plurality of stages, the valve rod 51 includes a plurality of unit stages 511; the respective unit sections 511 are connected in sequence in the axial direction of the valve stem 51. In the axial direction of the valve stem 51, adjacent unit segments 511 are connected by abutment, screw connection, welding, or the like. For example: the number of the unit sections 511 is two or more.

In the present embodiment, as shown in fig. 4 and 5, the spool assembly 30 includes a spool 301 and a spool holder 32, at least part of the spool 301 is located in the valve chamber 101, the spool holder 32 supports the spool 301, and the spool holder 32 is provided integrally with or separately from the spool 301. The spool holder 32 abuts or is welded to the spool 301. The valve rod assembly 50 is in transmission connection with the power assembly 40 and the valve core 301, the valve core 301 can adjust the throttle area of the valve port 21, and the valve core 301 can be attached to the wall of the valve port 21. The valve core 301 may have a spherical structure or a columnar structure.

In the present embodiment, as shown in fig. 4 to 13, the valve port portion 20 is provided separately from the valve body 10, the valve port portion 20 is fixedly connected to the valve body 10, and the valve port portion 20 is hermetically connected to the valve body 10; the versatility of the valve device 100 can be increased by replacing the valve portion 20. The valve body 10 has a mounting portion 13, the mounting portion 13 has a mounting groove 131, at least a portion of the valve port portion 20 is located in the mounting groove 131, and the valve port portion 20 is sealingly connected to the mounting portion 13 to facilitate assembly of the valve port portion 20. Of course, in other embodiments, the valve port portion 20 and the valve body 10 are integrally formed, which serves to reduce the process of the valve port portion 20 and the valve body 10 and to strengthen the connection strength of the valve port portion 20 and the valve body 10.

In this embodiment, the mounting portion 13 includes an inner sidewall 132 and a bottom wall 133, where the inner sidewall 132 and the bottom wall 133 enclose at least a part of the wall of the mounting groove 131, and a part of the outer sidewall of the valve port portion 20 contacts at least a part of the bottom wall 133, and the bottom wall 133 can limit the position of the valve port portion 20 in the mounting groove 131, so as to improve the mounting accuracy of the valve port portion 20; a portion of the outer sidewall of the valve port portion 20 contacts at least a portion of the inner sidewall 132, and the valve port portion 20 is interference fit with the inner sidewall 132 to facilitate installation of the valve port portion 20. Of course, in other embodiments, the valve port 20 may be fixed to the valve body 10 by welding or threading. The valve body 10 further has a communication passage 14, a first communication port 141, and a second communication port 142, the first communication port 141 being in communication with the communication passage 14, the second communication port 142 being in communication with the communication passage 14, the first communication port 141 being located at the bottom wall 133, the first communication port 141 being in communication with the valve port 21, the second communication port 142 being in communication with the second passage 12.

In the present embodiment, as shown in fig. 4 to 13, the valve port 21 includes a first valve port section 211 and a second valve port section 212 in the extending direction of the valve port 21, the first valve port section 211 is adjacent to the valve chamber 101 with respect to the second valve port section 212, the inner diameter of any one of the walls of the first valve port section 211 is larger than the inner diameter of any one of the walls of the second valve port section 212, the valve element 301 can adjust the flow area of the first valve port section 211, or the valve element 301 can adjust the flow area of the second valve port section 211; for valve devices 100 with different opening demands, the valve core 301 can be replaced, so that different valve cores 301 can correspond to the first valve port section 211 or the second valve port section 212, and the valve devices 100 with different opening demands can be met, thereby being beneficial to reducing the cost of the valve devices 100. Wherein, along the extending direction of the valve port 21, the valve port 21 expands in diameter. Specifically, the valve port 21 extends from the second passage 12 to the valve chamber 101 in an expanded diameter. When the valve core 301 adjusts the flow area of the first valve port section 211, a part of the valve core 301 is positioned in the first valve port section 211; when the valve core 301 adjusts the flow area of the second valve port section 212, a part of the valve core (301) is positioned in the second valve port section (212).

In this embodiment, the wall of the first port section 211 includes a first section 215 and a third section 213, the third section 213 and the first section 215 being disposed along the direction of extension of the valve port 21, the third section 213 being adjacent to the valve chamber 101 relative to the first section 215. Along the extending direction of the valve port 21, the first section 215 extends in an equal diameter or an expanded diameter, the valve core 301 is matched with the first section 213, and the valve core 301 can adjust the effective flow area of the space in the first section 213. Wherein, the valve core 301 moves relative to the first segment 213, and the gap between the valve core 301 and the first segment 213 is changed, which plays a role in adjusting the effective flow area of the first valve port segment 211. When the valve spool 301 adjusts the flow area of the first port segment 211, a portion of the valve spool 301 is located within the first segment 215. The third segment 213 is expanded in diameter in the direction in which the valve port 21 extends, and the valve element 301 can be brought into contact with the third segment 213, so that wear of the valve element 301 on the third segment 213 can be reduced. The third section 213 is a plane, a curved surface or an arc surface, at least a part of the outer side wall of the valve core 301 is an arc surface 302, and the arc surface 302 can be in contact with the third section 213, so that abrasion of the valve core 301 and the third section 213 is further reduced.

In this embodiment, the wall of the second valve port section 212 includes a second section 216 and a fourth section 214, the fourth section 214 and the second section 216 being disposed along the direction of extension of the valve port 21, the fourth section 214 being adjacent the valve chamber 101 relative to the second section 216. Along the extending direction of the valve port 21, the second section 216 extends in an equal diameter or an expanded diameter, and the cooperation of the valve core 301 and the second section 216 can adjust the effective flow area of the second valve port section 212. Wherein, the valve core 301 and the second section 216 move relatively, and the clearance between the valve core 301 and the second section 216 is changed, which plays a role in adjusting the effective flow area of the space in the second section 216. When the valve core 301 adjusts the flow area of the second valve port section 212, a portion of the valve core 301 is positioned in the first section 215, a portion of the valve core 301 is positioned in the second section 216, and the valve core 301 has a gap with the first section 215. The fourth segment 214 is expanded in diameter in the extending direction of the valve port 21, and the valve element 301 can be in contact with the fourth segment 214, so that wear of the valve element 301 on the fourth segment 214 can be reduced. The fourth segment 214 is a plane or a curved surface, and the arc surface 302 of the valve core 301 can contact with the fourth segment 214, so that abrasion of the valve core 301 and the fourth segment 214 is further reduced. Along the axial direction of the valve port 21, the first segment 215 is greater than or equal to 0.4mm and/or the second segment 216 has a length greater than or equal to 0.4mm; in the radial direction of the valve port 21, the difference between the inner diameter of the first section 215 and the inner diameter of the second section 216 is greater than or equal to 0.2mm, so as to ensure that when the second valve core 33 adjusts the throttle area of the second valve port section 212, the working medium does not throttle in advance through the gap between the second valve core 33 and the first section 215. Preferably, the first segment 215 is greater than or equal to 0.5mm and/or the second segment 216 has a length greater than or equal to 0.5mm, the difference between the inner diameter of the first segment 215 and the inner diameter of the second segment 216 is greater than or equal to 0.4mm,

in the present embodiment, as shown in fig. 8 to 13, the spool 301 includes a first spool 31 or a second spool 33, at least part of the first spool 31 is located in the valve chamber 101, the first spool 31 is capable of adjusting the flow area of the first valve port section 211, at least part of the second spool 33 is located in the valve chamber 101, the second spool 33 is capable of adjusting the flow area of the second valve port section 212, the first spool 31 has a spherical structure, the second spool 33 has a spherical structure, and the diameter of the first spool 31 is larger than the diameter of the second spool 33; the valve device 100 can replace the first valve element 31 or the second valve element 33 to realize different opening demands of the valve device 100.

In the present embodiment, as shown in fig. 3, the valve device 100 further includes an adjustment seat assembly 60, and the adjustment seat assembly 60 includes an adjustment seat 61 and an elastic member 62; the valve body 10 has a mounting cavity 15; the regulating seat 61 is connected to the valve body 10, at least part of the wall of the mounting chamber 15 and part of the regulating seat 61 forming at least part of the wall of the valve chamber 101; the elastic members 62 respectively abut against the adjustment seat 61 and the spool holder 32. The position of the adjustment seat 61 is adjusted in the axial direction of the valve stem 51, and the adjustment seat 61 can adjust the load of the elastic member 62. The adjustment seat 61 is mounted to the valve body 10 by means of threads or the like; a third sealing ring 63 is arranged between the adjusting seat 61 and the valve body 10, the third sealing ring 63 is in contact with the adjusting seat 61, the third sealing ring 63 is in contact with the valve body 10, and the third sealing ring 63 can enable the adjusting seat 61 to be in sealing connection with the valve body 10. The adjusting seat 61 includes a first mating portion 611, where the first mating portion 611 is a first groove structure or a first boss structure, and at least a portion of the elastic member 62 is located on the first groove structure or sleeved on the outer side of the first boss structure. The valve core frame 32 includes a second mating portion 321, where the second mating portion 321 is a second groove structure or a second boss structure, and at least a portion of the elastic member 62 is located on the second groove structure or sleeved on the outer side of the second boss structure. The adjusting seat assembly 60 and the power assembly 40 are arranged on the opposite side of the valve body 10; the adjusting seat assembly 60 and the power assembly 40 are disposed at both sides of the valve body 10 in the axial direction of the valve stem 51. For example, the elastic member 62 is a spring.

The operation of the valve device 100 is described as follows:

the medium enters the valve chamber 101 from the first channel 11, the first valve core 31 adjusts the throttling area of the valve port 21, the valve port 21 throttles the medium, and the throttled medium enters the second channel 12 and then flows out from the second channel 12; when the medium passes through the third channel 16, part of the medium enters the second cavity 47, the medium entering the second cavity 47 influences the temperature of the temperature sensing medium, when the temperature of the temperature sensing medium changes, the diaphragm 43 fluctuates, the transmission piece 44 moves under the action of the diaphragm 43, the transmission piece 44 drives the valve rod 51 to move, and the valve rod 51 drives the first valve core 31 or the second valve core 33.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When technical features of different embodiments are embodied in the same drawing, the drawing can be regarded as a combination of the embodiments concerned also being disclosed at the same time.

The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application.

Claims (14)

1. A valve device, the valve device (100) having a valve chamber (101), characterized in that the valve device (100) comprises:

-a valve body (10), at least part of said valve chamber (101) being located in said valve body (10);

a valve port portion (20), wherein the valve port portion (20) is fixedly connected with the valve body (10) or is of an integral structure, the valve port portion (20) is provided with a valve port (21), the valve port (21) can be communicated with the valve chamber (101), the valve port (21) comprises a first valve port section (211) and a second valve port section (212) along the extending direction of the valve port (21), the first valve port section (211) is adjacent to the valve chamber (101) relative to the second valve port section (212), and the inner diameter of any part of the wall of the first valve port section (211) is larger than the inner diameter of any part of the wall of the second valve port section (212);

-a valve body (301), at least part of the valve body (301) being located in the valve chamber (101), the valve body (301) being capable of adjusting the flow area of the first valve port section (211) or the valve body (301) being capable of adjusting the flow area of the second valve port section (212).

2. The valve device according to claim 1, wherein the wall of the first valve port section (211) comprises a first section (215), the first section (215) extending in equal or enlarged diameter along the direction of extension of the valve port (21); the wall of the second valve port section (212) comprises a second section (216), and the second section (216) extends in an equal diameter or expanded diameter along the extending direction of the valve port (21);

-the valve spool (301) is capable of adjusting a flow area within the first section (215); alternatively, the valve spool (301) is capable of adjusting the flow area within the second section (216).

3. The valve device according to claim 2, characterized in that the length of the first section (215) is greater than or equal to 0.4mm and/or the length of the second section (216) is greater than or equal to 0.4mm;

the difference between the inner diameter of the first section (215) and the inner diameter of the second section (216) along the radial direction of the valve port (21) is greater than or equal to 0.2mm.

4. A valve device according to claim 3, wherein the wall of the first valve port section (211) further comprises a third section (213), the third section (213) being arranged with the first section (215) in the direction of extension of the valve port (21), the third section (213) being adjacent to the valve chamber (101) relative to the first section (215), the third section (213) being enlarged in the direction of extension of the valve port (21), the valve body (301) being contactable with the third section (213);

the wall of the second valve port section (212) further comprises a fourth section (214), the fourth section (214) and the second section (216) are arranged along the extending direction of the valve port (21), the fourth section (214) is adjacent to the valve chamber (101) relative to the second section (216), the fourth section (214) is expanded along the extending direction of the valve port (21), and the valve core (301) can be contacted with the fourth section (214).

5. Valve device according to claim 4, characterized in that the third section (213) is a plane or an arc and the fourth section (214) is a plane or an arc;

the outer side wall of the valve core (301) is at least partially an arc-shaped surface (302), and the arc-shaped surface (302) can be in contact with the third section (213) or the fourth section (214).

6. The valve device according to any one of claims 1 to 5, wherein the valve spool (301) comprises a first valve spool (31) or a second valve spool (33), the first valve spool (31) being capable of adjusting the flow area of the first valve port section (211), the second valve spool (33) being capable of adjusting the flow area of the second valve port section (212);

the first valve core (31) is of a spherical structure, the second valve core (33) is of a spherical structure, and the diameter of the first valve core (31) is larger than that of the second valve core (33).

7. The valve device according to claim 2, wherein the wall of the first valve port section (211) further comprises a third section (213), the third section (213) being arranged with the first section (215) along the extension direction of the valve port (21), the third section (213) being adjacent to the valve chamber (101) relative to the first section (215), the third section (213) being enlarged in the extension direction of the valve port (21), the valve body (301) being contactable with the third section (213);

the wall of the second valve port section (212) further comprises a fourth section (214), the fourth section (214) and the second section (216) are arranged along the extending direction of the valve port (21), the fourth section (214) is adjacent to the valve chamber (101) relative to the second section (216), the fourth section (214) is expanded along the extending direction of the valve port (21), and the valve core (301) can be contacted with the fourth section (214).

8. Valve device according to claim 7, characterized in that the third section (213) is a plane or an arc and the fourth section (214) is a plane or an arc;

the outer side wall of the valve core (301) is at least partially an arc-shaped surface (302), and the arc-shaped surface (302) can be in contact with the third section (213) or the fourth section (214).

9. A valve device according to any one of claims 1 to 5, 7 and 8, wherein the valve body (10) comprises a mounting portion (13), the mounting portion (13) having a mounting groove (131), at least part of the valve port portion (20) being located in the mounting groove (131), the valve port portion (20) being in sealing connection with the mounting portion (13).

10. The valve device according to claim 9, wherein the mounting portion (13) comprises an inner side wall (132) and a bottom wall (133), the inner side wall (132) and the bottom wall (133) enclosing at least part of the wall of the mounting groove (131);

a part of the outer side wall of the valve port part (20) is in contact with at least a part of the bottom wall (133), a part of the outer side wall of the valve port part (20) is in contact with at least a part of the inner side wall (132), and the valve port part (20) is in interference fit with the inner side wall (132).

11. A valve device according to claim 6, characterized in that the valve body (10) comprises a mounting portion (13), the mounting portion (13) having a mounting groove (131), at least part of the valve port portion (20) being located in the mounting groove (131), the valve port portion (20) being in sealing connection with the mounting portion (13).

12. Valve device according to claim 11, wherein the mounting portion (13) comprises an inner side wall (132) and a bottom wall (133), the inner side wall (132) and the bottom wall (133) enclosing at least part of the wall of the mounting groove (131);

a part of the outer side wall of the valve port part (20) is in contact with at least a part of the bottom wall (133), a part of the outer side wall of the valve port part (20) is in contact with at least a part of the inner side wall (132), and the valve port part (20) is in interference fit with the inner side wall (132).

13. The valve device according to claim 10 or 12, characterized in that the valve body (10) has a first channel (11) and a second channel (12), the first channel (11) being in communication with the valve chamber (101), the second channel (12) being capable of communicating with the valve chamber (101) through the valve port (21);

the valve body (10) is further provided with a communication channel (14), a first communication port (141) and a second communication port (142), the first communication port (141) is communicated with the communication channel (14), the second communication port (142) is communicated with the communication channel (14), the first communication port (141) is located in the bottom wall (133), the first communication port (141) is communicated with the valve port (21), and the second communication port (142) is communicated with the second channel (12).

14. The valve device according to claim 13, wherein the valve body (10) has a mounting cavity (15), the valve device (100) further comprising:

-a power assembly (40), said power assembly (40) being mounted to said valve body (10);

a valve rod assembly (50), wherein the valve rod assembly (50) is in transmission connection with the power assembly (40) and the valve core (301), and the power assembly (40) acts on the valve core (301) through the valve rod assembly (50);

a spool holder (32), the spool holder (32) being connected to the spool (301);

the valve body comprises a valve body (10) and is characterized by comprising an adjusting seat assembly (60), wherein the adjusting seat assembly (60) comprises an adjusting seat (61) and an elastic piece (62), the adjusting seat (61) is connected with the valve body (10), at least part of walls of the mounting cavity (15) and parts of the adjusting seat (61) form at least part of walls of the valve chamber (101), and the elastic piece (62) is respectively abutted against the valve core frame (32) and the adjusting seat (61).

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