CN212718025U - Valve assembly - Google Patents

Abstract

The application provides a valve assembly, comprising a valve body, a valve rod and a matching pipe part; the valve body comprises a first valve body part and a second valve body part; the valve body has a valve cavity, the first valve body part has a first cavity, the second valve body part has a second cavity; the valve rod is at least partially positioned in the valve cavity; the valve body is provided with a valve port; the valve rod can move in the valve cavity to close or open the valve port so as to isolate or communicate the first cavity from or with the second cavity; the matching pipe part comprises a main pipe body, a first pipe part and a second pipe part; the main pipe body is connected between the first pipe part and the second pipe part; the cavity of the main pipe body is communicated with the cavity of the first pipe part and the cavity of the second pipe part; the first pipe portion and the second pipe portion each include a constricted pipe portion; the first pipe portion further includes a first connecting pipe portion connected to the constricted pipe portion of the first pipe portion; the valve assembly also includes an adhesive layer between the first connecting tube portion and the first valve body portion. This application is favorable to reducing the quantity of the welding position of valve module, simplifies the welding process.

Description

Valve assembly

Technical Field

The application relates to the field of air conditioning system valves, in particular to a valve assembly.

Background

In the operation process of the air conditioning system, the stop valve can play a role in controlling the on-off of the refrigerant flow path. Pulsation noise occurs when the refrigerant flows in the pipe system, and thus a silencer is also required to be installed in the pipe system to effectively reduce the pulsation noise. In the related art, a section of connecting pipe for welding with other elements is usually welded at two ends of the silencer, a section of connecting pipe for welding with other elements is usually welded on the stop valve, the number of welding positions of an assembly formed by the silencer and the stop valve is large, and the welding process is complex.

SUMMERY OF THE UTILITY MODEL

The present application provides a valve assembly that facilitates a reduction in the number of weld locations.

The application provides a valve assembly, comprising a valve body, a valve rod and a matching pipe part;

the valve body comprises a first valve body portion and a second valve body portion; the valve body having a valve cavity, the first valve body portion having a first chamber, the second valve body portion having a second chamber; the valve rod is at least partially positioned in the valve cavity; the valve body is provided with a valve port; the valve rod can move in the valve cavity to close or open the valve port so as to isolate or communicate the first cavity from the second cavity;

the matching pipe part comprises a main pipe body, a first pipe part and a second pipe part; the main pipe body is connected between the first pipe part and the second pipe part, and a cavity of the main pipe body is communicated with a cavity of the first pipe part and a cavity of the second pipe part; the first tube portion and the second tube portion each comprise a constricted tube portion; the pipe diameter of one side of the reducing pipe part, which is far away from the main pipe body, is smaller than that of one side connected with the main pipe body; the first pipe portion further includes a first connecting pipe portion connected to the constricted pipe portion of the first pipe portion;

the valve assembly further comprises an adhesive layer, the adhesive layer is located between the first connecting pipe portion and the first valve body portion, at least partial region of the first connecting pipe portion and at least partial region of the first valve body portion are both in contact with the adhesive layer, and therefore the valve body and the matching pipe portion are fixedly bonded.

Because the valve assembly has the adhesive layer that is located between first connecting pipe portion and the first valve body portion, be favorable to adopting the bonding mode to realize the fixed between valve body and the cooperation pipe portion like this, therefore be favorable to reducing the holistic welding position's of valve assembly quantity to simplify the welding process.

Drawings

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

FIG. 2 is a schematic structural diagram of a valve body provided in an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of the valve body of FIG. 2;

FIG. 4 is a schematic structural diagram of a fitting tube portion according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a connection structure between a first sub-pipe and a first valve body according to an embodiment of the present disclosure;

FIG. 6 is an enlarged view of a portion of the structure shown in FIG. 5 of the present application;

FIG. 7 is an enlarged view of another connection structure of the first sub-pipe portion and the first valve body portion according to the embodiment of the present disclosure;

FIG. 8 is a schematic view of a second connection structure between the first sub-pipe and the first valve body according to an embodiment of the present disclosure;

FIG. 9 is a schematic view of a third connection structure between the first sub-pipe and the first valve body according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of a fourth connection structure between the first sub-pipe and the first valve body according to an embodiment of the present disclosure;

fig. 11 is a schematic view of a connection structure between a fifth first sub-pipe portion and a first valve body portion according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Referring to fig. 1, the present embodiment provides a valve assembly 10 including a valve body 20, a valve stem 30, and a mating tube portion 40.

The valve body 20 includes a first body portion 21 and a second body portion 22, the valve body 20 having a valve chamber 201, the first body portion 21 having a first chamber 210, and the second body portion 22 having a second chamber 220. The valve stem 30 is at least partially located in the valve chamber 201, the valve body 20 is provided with a valve port 202, and the valve stem 30 can move in the valve chamber 201 to close or open the valve port 202 so as to isolate or communicate the first chamber 210 with the second chamber 220. In some embodiments, the valve body 20 and the valve rod 30 are beneficial to achieve the related functions of a stop valve, and the stop valve can be connected with an indoor unit and an outdoor unit in an air conditioning system to play a role in controlling a refrigerant flow channel. The valve rod 30 may have an external thread, and the wall of the valve body 20 forming the valve cavity 201 may have an internal thread matching the external thread, so that the valve rod 30 may reciprocate in the valve cavity 201 under the action of the thread pair, and may be close to the valve port 202 or far from the valve port 202, so as to separate or communicate the first cavity 210 and the second cavity 220. In order to ensure the sealing between the valve rod 30 and the valve body 20, a soft sealing element such as an elastic sealing ring can be arranged between the valve rod and the valve body, a bonnet capable of being in threaded fit with the valve body 20 can be additionally arranged, a metal hard seal is formed between the bonnet and the valve body, and the sealing performance of the stop valve can be further guaranteed.

The first and second valve body portions 21, 22 may each have a central axis, and the central axes may be coincident, parallel, perpendicular, or at an angle. In the embodiment provided herein, reference is made to fig. 3, which illustrates that the central axis of the first valve body portion 21 is perpendicular to the central axis of the second valve body portion 22.

The valve body 20 may also include a filling structure to facilitate filling of the system with a coolant, such as the right-hand valve body portion of fig. 2 and 3, the filling structure being at least partially located within the cavity of the right-hand valve body, and the filling structure may include a valve core or the like. Of course, the valve body may not be provided with a filling structure, and the application is not limited to this.

As shown in fig. 4, the fitting pipe portion 40 includes a main pipe body 41, a first pipe portion 42, and a second pipe portion 43. The main pipe 41 is connected between the first pipe part 42 and the second pipe part 43, the corresponding cavity of the main pipe 40 communicates with the cavity of the first pipe part 42 and the cavity of the second pipe part 43, and the first pipe part 42 and the second pipe part 43 both include a reducing pipe part 440.

The fitting tube portion 40 can perform a sound deadening function because the pipe diameter P1 of the side of the constricted tube portion 440 remote from the main tube body 41 is smaller than the pipe diameter P2 of the side connected to the main tube body 41. When the fluid flows in the inner cavity of the matching pipe part 40, the abrupt change of the section of the pipe is beneficial to utilizing the change of the acoustic impedance to reflect the sound source transmitted along the pipe to the sound source direction to achieve the purpose of reducing the noise, meanwhile, the fluid enters the cavity of the main pipe body 41 through the cavity of the reducing pipe part 440, the cross-sectional area of the fluid flowing in is gradually increased, the flow rate of the fluid is slow, the pressure is reduced, the cavity at the position of the main pipe body 41 forms a buffer area, and the noise reduction is also beneficial to.

First pipe portion 42 further includes a first connecting pipe portion 421 connected to a constricted pipe portion 440 of first pipe portion 42. The valve assembly 10 further includes an adhesive layer 50, the adhesive layer 50 is located between the first connection pipe 421 and the first valve body 21, and at least a partial region of the first connection pipe 421 and at least a partial region of the first valve body 21 are both in contact with the adhesive layer 50 so as to adhesively fix the valve body 20 and the fitting pipe portion 40. The adhesive connection is advantageous in reducing the number of welding positions between the first connection pipe portion 421 and the first valve body portion 21. The first connecting tube portion 421 may be integrally formed with the constricted tube portion 440 as a whole, or a part of the tube structure of the first connecting tube portion 421 may be integrally formed with the constricted tube portion 440.

The second pipe portion 43 further comprises a second connecting pipe portion 425 connected to a constricted pipe portion 440 of the second pipe portion 43, and referring to fig. 4, the second connecting pipe portion 425 is connected to the constricted pipe portion 440 in a part thereof extending into the cavity of the main pipe body 41 and in another part thereof located outside the cavity of the main pipe body 41 and the cavity of the constricted pipe portion 440.

In one embodiment provided by the present application, the first connecting pipe 421 includes a first sub-pipe portion 422 and a second sub-pipe portion 423, the second sub-pipe portion 423 is integrally formed with the reducing pipe 440, the first sub-pipe portion 422 and the second sub-pipe portion 423 are welded or bonded and fixed integrally, specifically, an end of the first sub-pipe portion 422 is located in a cavity of the second sub-pipe portion 423, and both form a sleeve structure. This is favorable to simplifying the processing degree of difficulty of cooperation pipe portion 40, carries out the amalgamation through the multistage body and reduces the manufacturing and processing complexity.

The adhesive layer 50 is located between the first sub-pipe portion 422 and the first valve body portion 21. The valve body 20 has a stop surface 211, and an end surface 4221 of the first sub-pipe portion 422 remote from the second sub-pipe portion 423 is in at least partial area contact with the stop surface 211. The stop surface 211 may be located on the first valve body portion 21 or elsewhere on the valve body 20. Stop face 211 can carry on spacingly to the installation direction of first sub-pipe portion 422 for first sub-pipe portion 422 is convenient for fix a position and gluey, improves the stability of bonding.

The first valve body portion 21 includes a first connection fitting portion 23 and a first stepped fitting portion 24, the first connection fitting portion 23 is provided with a first passage 231, the first passage 231 is a part of the first chamber 210, the first sub-pipe portion 422 is at least partially located in the first passage 231, and in the embodiment shown in fig. 5, the first sub-pipe portion 422 is partially located in the first chamber 210 and partially located outside the first chamber 210.

The first sub-tube portion 422 has an inner surface 4221 and an outer peripheral surface 4222 circumferentially surrounding a lumen thereof, the outer peripheral surface 4222 of the first sub-tube portion 422 is in contact with the adhesive layer 50 at least in a partial region, the first connection fitting portion 23 has an annular inner wall surface 232 for forming the first passage 231, and at least a partial region of the annular inner wall surface 232 is in contact with the adhesive layer 50. A gap region for accommodating the adhesive layer 50 is provided between the outer peripheral surface 4222 of the first sub-pipe portion 422 and the annular inner wall surface 232 of the first connection fitting portion 23. During glue application, the glue may be applied to the outer peripheral surface 4222 of the end portion of the first sub-pipe portion 422, or the glue may be applied to the annular inner wall surface 232 of the first connection matching portion 23, or the glue may be applied to the outer peripheral surface 4222 of the end portion of the first sub-pipe portion 422, or may be applied to the annular inner wall surface 232 of the first connection matching portion 23, and the applied glue is cured to finally form the adhesive layer 50.

The first stepped mating portion 24 protrudes toward the first cavity 210 than the first connection mating portion 23, the blocking surface 211 is located at the first stepped mating portion 24, and the blocking surface 211 is connected to the annular inner wall surface 232. First step cooperation portion 24 is except carrying out spacing effect through blockking face 211 to first sub-pipe portion 422, and it can also prevent that the colloid from overflowing into first chamber 210 to block face 211 to be favorable to improving the stability of product, the colloid is difficult to get into first chamber 210, thereby is difficult to pollute the fluid, and is difficult to influence the precision control of other spare parts in the system.

The first step-shaped mating portion 24 has a second channel 241, the first channel 231 and the second channel 241 together form a first cavity 210, and a channel opening of the second channel 241 on a side away from the first channel 231 forms the valve port 202. The valve stem 30 is movable relative to the valve port 202 in the axial direction of the second passage 241, and when the valve stem 30 opens the valve port 202, the second passage 241 communicates the lumen of the first sub-pipe portion 422 with the valve chamber 201.

Referring to the enlarged view of fig. 6, the stopper face 211 is disposed perpendicular to the axial direction of the second channel 241, and the first stepped mating portion 24 protrudes to a height greater than the thickness of the adhesive layer 50 with respect to the annular inner wall surface 232 of the first connection mating portion 23. The inner surface 4221 of the first sub-pipe portion 422 may be slightly lower than the inner wall surface of the first stepped mating portion 24 forming the second passage 241 or flush with the inner wall surface of the first stepped mating portion 24 forming the second passage 241. Alternatively, as shown in fig. 7, the blocking surface 211 is inclined with respect to the axial direction of the second channel 241, and in the case that the blocking surface 211 is inclined, it is advantageous to reduce the flow resistance of the fluid and provide the fluidity of the fluid.

Referring to fig. 6, the length L of the adhesive layer 50 in the axial direction of the second passage 241 is 1mm to 10mm, and in some embodiments, the length L of the adhesive layer 50 in the axial direction of the second passage 241 may be 2.5mm to 5 mm. The thickness D of the adhesive layer 50 is 0.05mm to 1mm, and in some embodiments, the thickness D of the adhesive layer 50 is 0.15mm to 0.35mm, so that the length and thickness of the adhesive layer 50 in the axial direction of the second passage 241 can improve the strength of the connection between the first sub-pipe portion 422 and the first valve body portion 21. The material of the adhesive layer 50 may be a high-strength epoxy-based two-component structural adhesive or a high-strength epoxy-based single-component structural adhesive.

In other embodiments of the present application, the first sub-tube portion 422 has a first sub-chamber 4223 extending through the tube body, the first valve body portion 21 includes a tubular mating portion 25, the tubular mating portion 25 has a third passage 251, and the third passage 251 is at least a portion of the first chamber 210. The valve body may also be provided with a second stepped mating portion that mates with the tubular mating portion 25, or utilize the surface structure of the valve body itself to limit the first sub-pipe portion 422.

Referring to fig. 8, tubular engagement portion 25 is at least partially disposed within first subchamber 4223, with the outer peripheral wall of tubular engagement portion 25 being in at least partial area contact with bonding layer 50, and with the inner surface 4221 of first subchamber 4223 circumferentially surrounding first subchamber 422 being in at least partial area contact with bonding layer 50. The stopper face 211 is located at the valve body 20, and the stopper face 211 is continuous with the outer peripheral wall of the tubular fitting portion 25.

To prevent the glue from escaping into the first sub-chamber 4223 and the third channel 251 of the first sub-tube part 422, the tubular mating part 25 may be provided with a receiving groove 254, the opening of the receiving groove 254 being arranged towards the inner surface 4221 of the first sub-tube part 422, the adhesive layer 50 being at least partially located in the receiving groove 254. The accommodating groove 254 can only have an opening at the top, the first sub-pipe portion 422 plugs the opening of the accommodating groove 254, in order to ensure the glue applying thickness, the depth of the accommodating groove 254 is 0.05mm to 1mm, in some embodiments, the depth of the accommodating groove 254 is 0.15mm to 0.35mm, that is, the glue thickness is ensured to meet the glue applying requirement through the depth of the accommodating groove 254, and the glue is overflow protected by the first sub-pipe portion 422 through the side wall connected with the bottom of the accommodating groove 254, so that the glue is not easy to leak to the third channel 251. The length of the receiving groove 254 in the axial direction of the third channel 251 is 1mm to 10mm, which is beneficial to ensure the glue application area and further beneficial to the connection strength between the parts, and in some embodiments, the length of the receiving groove 254 in the axial direction of the third channel 251 may be 2.5mm to 5 mm. The material of the adhesive layer 50 is high-strength epoxy-based bi-component structural adhesive or high-strength epoxy-based mono-component structural adhesive.

In other embodiments, as shown in fig. 9, the tubular fitting portion 25 is provided with a plurality of concave portions 255 on a side away from the third channel 251, a convex portion 256 is formed between two adjacent concave portions 255, the concave portions 255 are opened towards the inner surface 4221 of the first sub-pipe portion 422, the two adjacent concave portions 255 are separated by the convex portion 256, and the plurality of concave portions 255 and the plurality of convex portions 256 form an uneven tongue-and-groove surface on at least a partial region of the side of the tubular fitting portion 25 away from the third channel 251. The tongue-and-groove surface can be formed on the bottom of the receiving groove 254 in fig. 8, or can be formed directly on the surface of the tubular fitting portion 25 on the side away from the third channel 251. This tongue-and-groove face is favorable to adhesive linkage 50 to improve the joint strength of tubulose cooperation portion 25 and first sub-pipe portion 422, and can play the effect that prevents excessive glue to a certain extent.

The first connection pipe 421 and the first valve body 21 are fixed to each other by the adhesive layer 50 in the direction of the center axis of the first valve body 21. In other embodiments, first sub-tube portion 422 has a first sub-chamber 4223 extending through its tube, first valve body portion 21 includes a tubular mating portion 25, and tubular mating portion 25 has a third passageway 251, third passageway 251 being at least a portion of first chamber 210, third passageway 251 being in communication with first sub-chamber 4223. As shown in fig. 10, the first connecting pipe portion 421 and the first valve body portion 21 may be adhesively fixed by the adhesive layer 50 in a direction perpendicular to the central axis of the first valve body portion 21, that is, the adhesive layer 50 may be located between the end surface 4225 of the free end of the first connecting pipe portion 421 and the first valve body portion 21. The free end of the first connecting tube portion 421 may form a flared edge 4224 facing away from the first subchamber 4223, an end surface 4225 is formed on a side of the flared edge 4224 facing the first valve body portion 21, and the end surface 4225 may be perpendicular to the axial direction of the third passage 251. In order to prevent the flash, the first connecting tube portion 421 may also be provided with, for example, a projection on the side of the adhesive layer 50 close to the central axis of the third passage 251, or the first valve body portion 21 may be provided with a projection on the side of the adhesive layer 50 close to the central axis of the third passage 251, or the like.

In other embodiments, referring to fig. 11, first sub-tube portion 422 has a first sub-chamber 4223 extending through its tube, first valve body portion 21 includes a tubular mating portion 25, tubular mating portion 25 has a third passageway 251, third passageway 251 is at least a portion of first chamber 210, and third passageway 251 is in communication with first sub-chamber 4223. The first valve body portion 21 may be provided with a groove 252, the groove 252 is located at the periphery of the third channel 251, the first sub-pipe portion 422 has a containing matching portion 4226 matching with the groove 252, the containing matching portion 4226 can be contained in the groove 252, at least part of the bonding layer 50 is also contained in the groove 252, the bonding layer 50 is located between the containing matching portion 4226 and the groove wall of the groove 252, specifically, the surface of the containing matching portion 4226 may be coated with a colloid and then inserted between the grooves 252, and the groove walls containing the matching portion 4226 and the groove 252 are both in contact with the bonding layer 50, so that the two components are bonded and fixed through the bonding layer 50.

The material of first sub-pipe portion 422 includes one or more in iron, copper alloy, the aluminum alloy, and the material of first sub-pipe portion 422 also can be nonmetal, when the material of valve body 20 is inequality with the material of the body part that realizes amortization functions such as main pipe body 41, reduces different kind of metallic material welded difficulty and reduces different kind of metallic material welded electrochemical corrosion problem like this.

In addition, in the embodiment of this application, first sub-pipe portion 422 can be the complete takeover of integrative extension, reduces the takeover spare part quantity when stop valve and muffler are connected among the relevant art, is favorable to realizing the design that integrates. Of course, in some embodiments, it may be possible to reduce the length of first sub-pipe portion 422 or even eliminate first sub-pipe portion 422, thus allowing closer proximity between the converging pipe portion 440 of the muffler and the valve body 20 of the shut-off valve, which may be beneficial in reducing the space occupied by the system. Adopt adhesive linkage 50 to realize fixing between first connecting pipe portion 421 and the first valve body portion 21, be favorable to reducing the quantity of whole air conditioning system's welding position to simplify the welding process, use adhesive linkage 50 to realize the sealed to the coupling part, it is simple to make, sealed effectual, and reduce the electrochemical corrosion's that different kinds of metals brought hidden danger.

In the related technology, a connecting pipe is welded on both the silencer and the stop valve, and the connecting pipe of the silencer and the connecting pipe of the stop valve are connected by welding a connecting pipe. So that the air conditioning system has more welding points and complex processing procedures. In order to reduce the number of welding points, if a connecting pipe of the silencer is omitted, when the connecting pipe of the stop valve is directly welded with the silencer, the silencer is generally made of iron, the connecting pipe is generally made of copper, the connecting pipe and the silencer are made of dissimilar metals, in order to reduce the problem that iron is easy to corrode, high-temperature spraying needs to be carried out on the surface of the silencer and the position welded with the connecting pipe, a corrosion-resistant protective coating is added, and the sealing effect of a sealing element in the stop valve can be influenced by the high temperature of a spraying process. If the takeover of cancellation stop valve, the takeover that utilizes the muffler directly welds with the stop valve, because the stop valve lies in that this takeover welding back needs to wash with the brazing flux, and the inner wall of muffler can not be stained with water, can have the corrosion hidden danger, therefore the correlation technique all has more problem in the mode that adopts welded connection. The valve assembly in the application is provided with the bonding layer between the first connecting pipe part 421 and the first valve body part 21, so that the valve body 20 and the matching pipe part 40 are fixed in a bonding mode, the connection between the valve body and the matching pipe part can be fixedly connected by reserving certain curing time after glue application, welding spots and processes of an original brazing process are greatly reduced, the production efficiency of products is improved, and the number and the cost of connecting pipes are saved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A valve assembly (10) comprising a valve body (20), a valve stem (30), and a mating tube portion (40);

the valve body (20) comprises a first valve body portion (21) and a second valve body portion (22); the valve body (20) having a valve cavity (201), the first valve body portion (21) having a first chamber (210), the second valve body portion (22) having a second chamber (220); the valve rod (30) is at least partially positioned in the valve cavity (201); the valve body (20) is provided with a valve port (202); the valve rod (30) can move in a valve cavity (201) to close or open the valve port (202) so as to isolate or communicate the first cavity (210) with the second cavity (220);

the mating tube portion (40) includes a main tube body (41), a first tube portion (42), and a second tube portion (43); the main pipe body (41) is connected between the first pipe part (42) and the second pipe part (43), and the cavity of the main pipe body (41) is communicated with the cavity of the first pipe part (42) and the cavity of the second pipe part (43); the first tube portion (42) and the second tube portion (43) each comprise a constricted tube portion (440); the pipe diameter (P1) of one side of the reducing pipe part (440) far away from the main pipe body (41) is smaller than the pipe diameter (P2) of one side connected with the main pipe body (41); the first pipe portion (42) further comprises a first connecting pipe portion (421), and the first connecting pipe portion (421) is connected with the constricted pipe portion (440);

the valve assembly (10) further comprises an adhesive layer (50), the adhesive layer (50) is located between the first connecting pipe portion (421) and the first valve body portion (21), and at least partial areas of the first connecting pipe portion (421) and at least partial areas of the first valve body portion (21) are both in contact with the adhesive layer (50) so that the valve body (20) and the matching pipe portion (40) are fixedly adhered to each other.

2. The valve assembly (10) of claim 1, wherein the first connecting tube portion (421) includes a first sub-tube portion (422) and a second sub-tube portion (423); the second sub-pipe portion (423) and the reducing pipe portion (440) are integrally formed, and the first sub-pipe portion (422) and the second sub-pipe portion (423) are welded or bonded; the adhesive layer (50) is located between the first sub-pipe portion (422) and the first valve body portion (21);

the valve body (20) has a stop surface (211), and the end face of the first sub-pipe part (422) far away from the second sub-pipe part (423) is in contact with the stop surface (211) at least in partial areas.

3. The valve assembly (10) of claim 2, wherein the first valve body portion includes a first connection mating portion (23) and a first stepped mating portion (24); the first connecting matching part (23) is provided with a first channel (231), and the first channel (231) is a part of the first cavity (210);

the first sub-pipe portion (422) is at least partially located in the first passage (231); an outer peripheral surface (4222) of the first sub-pipe portion (422) is in contact with the adhesive layer (50) at least in a partial region; the first connection fitting part (23) has an annular inner wall surface (232) for forming the first channel (231), the annular inner wall surface (232) being in contact with the adhesive layer (50) at least in some regions; the first step matching part (24) protrudes towards the first cavity (210) than the first connection matching part (23), the blocking surface (211) is positioned at the first step matching part (24), and the blocking surface (211) is connected with the annular inner wall surface (232).

4. The valve assembly (10) of claim 3, wherein the first step mating portion (24) is provided with a second channel (241), the first channel (231) and the second channel (241) together forming the first cavity (210); a channel opening of the second channel (241) on a side away from the first channel (231) forms the valve port (202); the valve stem (30) being movable relative to the valve port (202) in an axial direction of the second passage (241); when the valve rod (30) opens the valve port (202), the second passage (241) communicates the lumen of the first sub-pipe portion (422) with the valve chamber (201).

5. Valve assembly (10) according to claim 4, wherein the blocking face (211) is perpendicular to the axial direction of the second channel (241) or the blocking face (211) is arranged obliquely with respect to the axial direction of the second channel (241).

6. The valve assembly (10) of claim 4, wherein the length of the adhesive layer (50) in the axial direction of the second passage (241) is 1mm to 10mm, and the thickness of the adhesive layer (50) is 0.05mm to 1 mm; the material of the bonding layer (50) is epoxy group double-component structural adhesive or epoxy group single-component structural adhesive.

7. The valve assembly (10) of claim 2, wherein the first sub-tube portion (422) has a first sub-cavity (4223) extending through a tube thereof; the first valve body portion (21) includes a tubular fitting portion (25); the tubular fitting (25) has a third channel (251), the third channel (251) being at least part of the first cavity (210); said tubular fitting (25) being located at least partially in said first subcavity (4223); the tubular fitting part (25) is at least partially in contact with the adhesive layer (50); the first sub-tube portion (422) is in contact with the adhesive layer (50) at least in a partial region around an inner surface (4221) of a lumen thereof in a circumferential direction.

8. The valve assembly (10) of claim 7, wherein the tubular mating portion (25) is provided with a receiving groove (254), an opening of the receiving groove (254) being provided toward an inner surface (4221) of the first sub-pipe portion (422); the bonding layer (50) is at least partially positioned in the accommodating groove (254), and the first sub-pipe part (422) seals an opening of the accommodating groove (254); the depth of the accommodating groove (254) is 0.05 mm-1 mm; the length of the accommodating groove (254) along the axial direction of the third channel (251) is 1-10 mm; the material of the bonding layer (50) is epoxy group double-component structural adhesive or epoxy group single-component structural adhesive.

9. The valve assembly (10) of claim 7, wherein the side of the tubular mating portion (25) remote from the third passage (251) is provided with a plurality of recesses (255), the openings of the recesses (255) being arranged towards the inner surface (4221) of the first sub-pipe portion (422), a protrusion (256) being formed between two adjacent recesses (255); the plurality of concave parts (255) and the plurality of convex parts (256) enable the tubular matching part (25) to form an uneven mortise surface at least in partial area on the side away from the third channel (251).

10. The valve assembly (10) of claim 2, wherein the first sub-tube portion (422) has a first sub-cavity (4223) extending through a tube thereof; the first valve body portion (21) includes a tubular fitting portion (25); the tubular fitting (25) has a third channel (251), the third channel (251) being at least part of the first cavity (210);

the first sub-pipe part (422) is provided with a flanging (4224) facing away from the first sub-cavity (4223), and an end surface (4225) of the flanging (4224) opposite to the first valve body part (21) is at least partially in contact with the bonding layer (50); the tubular fitting part (25) is at least partially in contact with the adhesive layer (50);

or, the tubular matching part (25) is provided with a groove (252), the groove (252) is positioned at the periphery of the third channel (251), the first sub-pipe part (422) is provided with a containing matching part (4226), the containing matching part (4226) is contained in the groove (252), the bonding layer (50) is at least partially contained in the groove (252), at least partial area of the containing matching part (4226) is in contact with the bonding layer (50), and at least partial area of the groove wall of the groove (252) is in contact with the bonding layer (50);

the first sub-pipe portion (422) is made of one of iron, copper alloy and aluminum alloy.

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