Valve device

Abstract

A valve device (100). A valve seat component (11) of the valve device (100) is provided with a step portion (115), and a lower end face of a sealing pad (12) abuts against the step portion (115). A first circulation passage (31) is provided between the lower end face of the sealing pad (12) and the step portion (115), and the first circulation passage (31) can be communicated with a space or gap formed between the sealing pad (12) and the valve seat component (11). In this way, a refrigerant in the space or gap can be removed by means of the first circulation passage (31), thereby avoiding adverse effects caused by refrigerant accumulation, and improving the sealing reliability of the valve device (100). In the valve device (100) according to another solution, the valve device (100) is provided with a second circulation passage (32), and the second circulation passage (32) can be communicated with the space or gap formed between the sealing pad (12) and the valve seat component (11), thereby avoiding adverse effects caused by refrigerant accumulation, and improving the sealing reliability of the valve device (100).

Description

A valve device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 12, 2023, with application number 2023106943639 and invention name “A Valve Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of fluid control technology, and in particular to a valve device. Background Art

[0003] The valve device includes a valve needle and a valve seat component. The valve seat component has a sealing gasket, and the sealing gasket has a valve port. The valve needle can cooperate with the valve port to adjust the flow state of the valve port. In the related technology, there is an installation gap or installation space between the sealing gasket and the main part of the valve seat component. Refrigerant may accumulate in the installation gap or installation space. The pressure change caused by the refrigerant state there may affect the shape or position of the sealing gasket, thereby affecting the sealing reliability of the valve device.

[0004] Summary of the Invention

[0005] The purpose of this application is to provide a valve device, which is conducive to improving the sealing reliability of the valve device.

[0006] To achieve the above objectives, one embodiment of the present application adopts the following technical solution:

[0007] A valve device, which includes a valve needle, a valve seat component and a sealing gasket, the sealing gasket is installed on the valve seat component, the sealing gasket has a valve port, the valve needle can cooperate with the sealing gasket to adjust the flow area of ​​the valve port; the valve seat component has a step portion, the lower end surface of the sealing gasket abuts against the step portion, and a first flow passage is provided between the lower end surface of the sealing gasket and the step portion, and the first flow passage can connect the space or gap formed between the sealing gasket and the valve seat component.

[0008] A valve device, which includes a valve needle, a valve seat component and a sealing gasket, the sealing gasket is installed on the valve seat component, the sealing gasket has a valve port, the valve needle can cooperate with the sealing gasket to adjust the flow area of ​​the valve port; the valve seat component has a step portion, the lower end surface of the sealing gasket abuts against the step portion, and the valve device has a second flow passage, which can connect the space or gap formed between the sealing gasket and the valve seat component.

[0009] An embodiment of the present application provides a valve device, wherein the valve seat component of the valve device has a step portion, the lower end surface of the sealing gasket abuts against the step portion, and a first flow passage is provided between the lower end surface of the sealing gasket and the step portion. The first flow passage can connect to the space or gap formed between the sealing gasket and the valve seat component. In this manner, the refrigerant in the space or gap can be discharged through the first flow passage, thereby avoiding the adverse effects of refrigerant accumulation and improving the sealing reliability of the valve device.

[0010] In a valve device provided in another embodiment of the present application, the valve device has a second flow passage, which can connect to the space or gap formed between the sealing gasket and the valve seat component. This arrangement can also avoid the adverse effects of refrigerant accumulation and improve the sealing reliability of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a front view schematic diagram of the structure of a first embodiment of the valve device of the present application from one perspective;

[0012] FIG2 is a schematic cross-sectional view of the valve device along plane AA in FIG1 ;

[0013] FIG3 is a schematic structural diagram of the valve component in FIG2 from one perspective;

[0014] FIG4 is a schematic cross-sectional view of the valve component along plane BB in FIG3 ;

[0015] FIG5 is an enlarged structural diagram of portion A in FIG4 ;

[0016] FIG6 is a schematic cross-sectional view of the valve component in FIG3 from another perspective;

[0017] FIG7 is a schematic perspective view of the first valve seat component;

[0018] FIG8 is a front view schematic diagram of the structure of the first valve seat component in FIG7 from one perspective;

[0019] FIG9 is a schematic cross-sectional view of the first valve seat component along the CC plane in FIG8 ;

[0020] FIG10 is a schematic diagram of a partially enlarged structure of portion A in another embodiment of the valve device of the first embodiment;

[0021] FIG11 is a schematic cross-sectional view of another embodiment of the valve device according to the first embodiment. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to Figures 1-11 and specific embodiments. Numerous specific details are provided in the following detailed description for a comprehensive understanding of the present invention. However, those skilled in the art will appreciate that the specific components, devices, and features illustrated in the drawings and described herein are merely exemplary and should not be construed as limiting.

[0023] The valve device 100 can be used in a vehicle thermal management system or an air-conditioning system, and in particular can be used in a circulation system using CO2 as a refrigerant, wherein the vehicle thermal management system includes a new energy vehicle thermal management system. In the vehicle thermal management system, the valve device 100 is often used as a throttling element or a switching element.

[0024] 1 to 11 , schematically, the valve device 100 includes a valve component 1, a valve body 101, and a coil assembly 102. The valve component 1 is fixedly connected to the valve body 101, and the coil assembly 102 is fixedly connected to the valve body 101. The valve body 101 has a valve body cavity 1013, and at least a portion of the valve component 1 is located in the valve body cavity 1013. Of course, in other embodiments, the coil assembly 102 can be fixedly connected to the valve component 1, and the two can be fixedly connected to the valve body 101 after assembly. In this embodiment, the valve body 101 is a separate valve block. In other embodiments, the valve body 101 can also be part of a system, such as a heat exchanger or a part of a flow channel plate. The coil assembly 102 includes a stator assembly, and the valve component 1 includes a valve seat component 11, a sleeve 13, and a rotor assembly 14. The sleeve 13 is fixedly connected to the valve seat component 11. The stator assembly 1021 is located outside the sleeve 13, and the rotor assembly 14 is located inside the sleeve 13. The valve assembly 1 further includes a screw portion 15 and a nut assembly 16. The screw portion 15 is fixedly connected to the rotor assembly 14 and threadedly engaged with the nut assembly 16. Passing a predetermined current through the stator assembly 1021 generates an excitation magnetic field, which drives the rotor assembly 14 to rotate. The rotor assembly 14 then drives the screw portion 15 to rotate. The screw portion 15 can subsequently drive the valve needle 2 to move relative to the valve port 121.

[0025] In conjunction with Figures 1 to 9, in the first embodiment of the valve device 100, the valve device 100 includes a valve seat component 11 and a sealing gasket 12, that is, the valve component 1 includes the valve seat component 11 and the sealing gasket 12, the sealing gasket 12 is installed on the valve seat component 11, and the sealing gasket 12 has a valve port 121. The valve component 1 also includes a screw portion 15 and a rotor assembly 14. In this embodiment, the screw portion 15 is fixedly connected to the rotor assembly 14, and the rotor assembly 14 can drive the screw portion 15 to move. The valve component 1 includes a valve needle 2 and a second valve needle 21. The screw portion 15 is connected to the second valve needle 21, and the valve needle 2 has a second valve port 22. The screw portion 15 can make the second valve needle 21 move relative to the second valve port 22, and the second valve needle 21 can drive the valve needle 2 to move relative to the valve port 121, thereby adjusting the flow area of ​​the valve port 121 and thereby adjusting the refrigerant flow rate of the valve port 121. In this embodiment, the screw portion 15 is connected to the second valve needle 21. A bearing component is provided at the connection between the screw portion 15 and the second valve needle 21. The lower end of the screw portion 15 is formed by riveting to form a riveted portion (not shown in the figure) that supports the lower end surface of the bearing component. In this embodiment, the valve needle 2 abuts against the upper end surface of the sealing gasket 12, thereby closing the valve port 121. In other embodiments, the valve needle 2 may also abut against the inner side surface of the sealing gasket 12 to close the valve port 121. The sealing gasket 12 is made of a non-metallic material. In this embodiment, the material of the sealing gasket 12 includes a resin material. It is not ruled out that the sealing gasket 12 contains impurities or other small amounts of specific metal components. The resin material may be, for example, PTFE (Polytetrafluoroethylene), PEek (polyetheretherketone), PPS (polyphenylene sulfide), etc. In other embodiments, the sealing gasket 12 may be a composite structure of a resin material and a rubber material. For example, the side of the sealing gasket 12 abutting against the valve needle 2 is a resin material layer, and the lower side of the resin material layer is a rubber material layer. 11 , in other embodiments, the valve component 1 may not be provided with the second valve needle 21 , and the screw portion 15 is connected to the valve needle 2 , and the screw portion 15 can drive the valve needle 2 to move relative to the valve port 121 , and the valve needle 2 cooperates with the sealing gasket 12 to adjust the flow area of ​​the valve port 121 , thereby adjusting the flow rate of the refrigerant.

[0026] In combination with Figures 2 to 6, in the first embodiment, the valve seat component 11 has a valve seat cavity 116, at least part of the valve needle 2 is located in the valve seat cavity 116, the valve seat cavity 116 includes a first valve cavity 111 and a second valve cavity 112, the first valve cavity 111 is located below the second valve cavity 112, when the valve needle 2 abuts the valve port 121, the first valve cavity 111 and the second valve cavity 112 are not connected, when the valve needle 2 is separated from the valve port 121, the first valve cavity 111 and the second valve cavity 112 are connected.

[0027] 2-6 , in the first embodiment, the valve seat component 11 has a plurality of channels 113, which are spaced apart along the circumference of the valve seat component 11. The channels 113 communicate with the valve seat cavity 116. Specifically, the channels 113 communicate with the second valve cavity 112 of the valve seat cavity 116. The valve device 100 also includes a second sealing member 42 and a third sealing member 43. The second sealing member 42 is located below the channel 113, while the third sealing member 43 is located above the channel 113. The second sealing member 42 is compressed between the valve seat component 11 and the valve body 101, while the third sealing member 43 is compressed between the valve seat component 11 and the valve body 101. The valve body 101 includes a first flow channel 1011 and a second flow channel 1012. The first flow channel 1011 can serve as a refrigerant inlet channel, and the second flow channel 1012 can serve as a refrigerant outlet channel, or vice versa. In this embodiment, the first valve chamber 111 is connected to the first flow channel 1011, and the second valve chamber 112 is connected to the second flow channel 1012 through the channel 113. The first flow channel 1011 and the second flow channel 1012 are adjusted to be on or off or to adjust the flow rate through the valve port 121.

[0028] In conjunction with Figures 2 to 6, in this embodiment, the valve seat component 11 has a step portion 115, the lower end surface of the sealing gasket 12 abuts the step portion 115, and a first flow passage 31 is provided between the lower end surface of the sealing gasket 12 and the step portion 115. The first flow passage 31 can connect to the space or gap formed between the sealing gasket 12 and the valve seat component 11. In this embodiment, one end of the first flow passage 31 connects to the space or gap formed between the sealing gasket 12 and the valve seat component 11, and the other end connects to the first valve cavity 111 of the valve seat component 11. This arrangement can prevent the refrigerant accumulated in the space or gap formed between the sealing gasket 12 and the valve seat component 11 from affecting the shape or position of the sealing gasket 12 due to pressure changes caused by changes in state, thereby affecting the sealing reliability of the valve device 100. For example, there may be a situation where the refrigerant accumulated in the space or gap formed between the gasket 12 and the valve seat component 11 causes thermal expansion, resulting in pressure, causing the position of the gasket 12 to shift or deform. At this time, the position where the valve needle 2 abuts the gasket 12 may change, resulting in increased leakage at the abutment point. The provision of the first flow passage 31 can avoid this situation. In other embodiments, the valve body 101 may form the valve seat component 11, the valve seat component 11 may form a step portion 115, the lower end face of the gasket 12 abuts against the step portion 115, and a first flow passage 31 is provided between the lower end face of the gasket 12 and the step portion 115. In this embodiment, the valve seat component 11 has a limiting portion 114, the limiting portion 114 abuts against the upper end face of the gasket 12, pressing the gasket 12 between the limiting portion 114 and the step portion 115. Of course, the gasket 12 may also be installed in other ways.

[0029] In conjunction with Figures 2 to 6, in this embodiment, the valve seat component 11 is relatively independent from the valve body 101, and the valve seat component 11 is fixedly connected to the valve body 101, and the connection methods include threaded connection, crimping, etc. The valve seat component 11 can be a split structure, and the split parts are fixedly connected to form the valve seat component 11. The valve seat component 11 can also be an integrally formed structure. An embodiment in which the valve seat component 11 is a split structure is used as an example. In this embodiment, the valve seat component 11 includes a first valve seat component 51, a second valve seat component 52, and a third valve seat component 53. The first valve seat component 51 and the second valve seat component 52 are formed separately and fixedly connected by welding, riveting, etc. The second valve seat component 52 and the third valve seat component 53 are formed separately and fixedly connected by welding, riveting, etc.

[0030] 2-6 , in this embodiment, the step portion 115 includes a step portion bottom surface 1151 and a step portion side surface 1152. The step portion bottom surface 1151 is formed on the first valve seat component 51, and the lower end surface of the sealing gasket 12 abuts against the step portion bottom surface 1151. In this embodiment, the step portion side surface 1152 includes a portion of the first valve seat component 51 and a portion of the second valve seat component 52. In other embodiments, the step portion side surface 1152 may be formed solely by the first step portion 115 or solely by the second valve seat component 52.

[0031] 2-6 , in this embodiment, the valve device 100 further includes a first sealing member 41 , which is located between the sealing gasket 12 and the valve seat component 11 . The first sealing member 41 is compressed between the sealing gasket 12 and the valve seat component 11 , and the first flow passage 31 can connect to the space or gap below or inside the first sealing member 41 .

[0032] In conjunction with Figures 2 to 6, in a specific implementation of this embodiment, the first sealing member 41 is located between the outer peripheral portion of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11 in the radial direction of the valve device 100, and the first sealing member 41 is pressed between the outer peripheral portion of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11. The first flow passage 31 can connect to the space or gap below the first sealing member 41. In this way, the space or gap below the first sealing member 41 can be connected to the first valve cavity 111 through the first flow passage 31. The first flow passage 31 can prevent the accumulation of refrigerant in the space or gap below the first sealing member 41, and prevent the accumulation of refrigerant from causing the accumulated pressure to cause the sealing gasket 12 to deform or deviate from its position, thereby affecting the sealing performance of the valve port 121 when the valve is closed, resulting in an increase in the leakage of the valve port 121. For example, the refrigerant accumulated in the space or gap below the first sealing member 41 expands due to heat, thereby generating pressure that causes the valve port 121 to deviate or deform. In this embodiment, the first seal 41 is compressed between the gasket 12 and the side surface 1152 of the stepped portion, and the gasket 12 and the side surface 1152 of the stepped portion are sealed by the first seal 41. In another embodiment of this embodiment, the first seal 41 can also be arranged between the lower end surface of the gasket 12 and the bottom surface 1151 of the stepped portion. In this case, the first flow passage 31 can prevent the accumulation of refrigerant in the space or gap inside the first seal 41. Of course, the first seal 41 can meet both of the above-mentioned configurations.

[0033] In conjunction with Figures 2-6 , in a specific implementation of the first embodiment, the stepped bottom surface 1151 has a first groove 311. The first groove 311 is located on the stepped bottom surface 1151 and is recessed from the stepped bottom surface 1151 away from the sealing gasket 12. The first groove 311 forms a first flow passage 31, which can communicate with the space or gap below the first sealing member 41. The number of first grooves 311 can be one or more.

[0034] Referring to FIG10 , in another embodiment of the first embodiment, compared to the previous embodiment, the sealing gasket 12 has a first groove 311. The first groove 311 is located on the lower end surface of the sealing gasket 12 and is disposed from the lower end surface of the sealing gasket 12 away from the bottom surface 1151 of the stepped portion. The first groove 311 forms a first flow passage 31, which can connect to the space or gap below the first sealing member 41. The number of first grooves 311 can be one or more.

[0035] In another embodiment of the first embodiment, compared to the previous embodiment, in this embodiment, the sealing gasket 12 has a first groove located at the lower end surface of the sealing gasket 12, the step portion 115 includes a step portion bottom surface 1151, and the step portion 115 has a second groove (not shown in the figure), the second groove is located at the step portion bottom surface 1151, and the second groove is arranged opposite to the first groove. The first groove and the second groove cooperate to form the first flow passage 31. The number of first grooves can be multiple, and the number of second grooves can be multiple.

[0036] In conjunction with Figures 2 to 6, in the first embodiment, the valve device 100 further has a second circulation passage 32, and the second circulation passage 32 can communicate with the space or gap on the upper side or outside of the first sealing member 41. The role played by the second circulation passage 32 is the same as that of the first circulation passage 31, both of which are to prevent the accumulation of refrigerant, which causes the position of the sealing gasket 12 to shift or deform. The first circulation passage 31 and the second circulation passage 32 work together to achieve better results. In this embodiment, the second circulation passage 32 is connected to the space or gap on the upper side of the first sealing member 41 for detailed introduction.

[0037] In conjunction with Figures 2-9, in one embodiment of this embodiment, the valve seat component 11 includes a first valve seat component 51 and a second valve seat component 52. The first valve seat component 51 and the second valve seat component 52 are fixedly connected. The fixed connection method includes welding and interference fit. Welding is used as an example for further description. The second flow passage 32 includes a first through hole 321 and a first gap 322. The first through hole 321 is located on the side wall of the first valve seat component 51. The first through hole 321 has an opening on the outer side wall of the first valve seat component 51. The first through hole 321 penetrates the first valve seat component 51 in the radial direction of the valve device 100. In this embodiment, the first valve seat component 51 has a first extension portion 511, and the first through hole 321 is disposed in the first extension portion 511. The first gap 322 is located between the first valve seat component 51 and the second valve seat component 52. The first gap 322 can communicate with the first through-hole 321. In this embodiment, the second valve seat component 52 has a second extension portion 521, at least a portion of which is located inside the first valve seat component 51. The first gap 322 is the gap between the lower end surface of the second extension portion 521 and the first valve seat component 51, and may further include a gap between the outer surface of the second extension portion 521 and the first valve seat component 51. The first through-hole 321 can communicate with the space or gap above the first sealing member 41 through the first gap 322. In this embodiment, the first valve seat component 51 and the second valve seat component 52 are fixedly connected by welding, forming a weld between the top surface of the first extension portion 511 and the second valve seat component 52. In this embodiment, the welding method is laser welding, but in other embodiments, brazing or other welding methods may also be used.

[0038] In another implementation of this embodiment, relative to the above-mentioned implementation, the first through hole 321 may not be provided, and the first extension portion 511 of the first valve seat component 51 and the second valve seat component 52 are welded to form a weld, and the weld is provided as an incomplete circle, with a number of gaps reserved between the welds. The number of gaps constitute a part of the first flow passage 31, serving to replace the first through hole 321 in the above-mentioned implementation.

[0039] In another implementation of this embodiment, the first flow passage 31 includes a first through hole 321, which is located on the side wall of the valve seat component 11. The first through hole 321 passes through the valve seat component 11 in the radial direction of the valve device 100. The first through hole 321 has an opening on the outer wall of the valve seat component 11. The first through hole 321 is directly connected to the space or gap on the upper side of the first sealing member 41.

[0040] In another embodiment of this embodiment, the valve seat component 11 includes a limiting portion 114. Specifically, in this embodiment, the second valve seat component 52 includes a limiting portion 114, which abuts the upper end surface of the sealing gasket 12. The lower end surface of the limiting portion 114 and / or the upper end surface of the sealing gasket 12 form a third groove (not shown in the figure). The third groove connects to the space or gap between the outer periphery of the sealing gasket 12 and the inner peripheral wall of the valve seat component 11. The third groove forms the second flow passage 32, or the third groove forms a portion of the second flow passage 32. The third groove forming the second flow passage 32 means that the second flow passage 32 mentioned in the previous embodiment can be omitted. The third groove forming a portion of the second flow passage 32 means that, in addition to the second flow passage 32 provided in the previous embodiment, a third groove is added as a portion of the second flow passage 32, that is, the second flow passage 32 is composed of multiple parts. Alternatively, a through hole can be provided that extends axially through the limiting portion 114 along the valve device, and the through hole connects to the third groove or directly connects to the space or gap above the first sealing member 41.

[0041] In the first embodiment of the electric valve, the first sealing member 41 is provided. However, the first sealing member 41 may not be provided as long as the sealing performance between the sealing gasket 12 and the step portion 115 is satisfied.

[0042] This application also provides a second embodiment of a valve device 100. In this embodiment, the valve device 100 includes a valve needle 2, a valve seat component 11, and a sealing gasket 12. The sealing gasket 12 is mounted on the valve seat component 11. The sealing gasket 12 has a valve port 121. The valve needle 2 can cooperate with the sealing gasket 12 to adjust the flow area of ​​the valve port 121. The valve device 100 has a second flow passage 32. The second flow passage 32 can connect the space or gap formed between the sealing gasket 12 and the valve seat component 11. The second flow passage 32 is specifically the same as the second flow passage 32 involved in the above embodiment. It should be noted that in this embodiment, only the second flow passage 32 can be provided, or the first flow passage 31 can be further provided on the basis of the second flow passage 32. The specific implementation scheme can be obtained by combining the structures in the above embodiment and will not be described in detail here. In this embodiment, a first sealing member 41 is provided. However, the first sealing member 41 can also be omitted as long as the sealing between the sealing gasket 12 and the step portion 115 is satisfied.

[0043] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A valve device (100), characterized in that: The valve device (100) comprises a valve needle (2), a valve seat component (11) and a sealing gasket (12); the sealing gasket (12) is installed on the valve seat component (11); the sealing gasket (12) has a valve port (121); the valve needle (2) can cooperate with the sealing gasket (12) to adjust the flow area of ​​the valve port (121); the valve seat component (11) has a step portion (115); the lower end surface of the sealing gasket (12) abuts against the step portion (115); a first flow passage (31) is provided between the lower end surface of the sealing gasket (12) and the step portion (115); the first flow passage (31) can connect the space or gap formed between the sealing gasket (12) and the valve seat component (11).

2. The valve device (100) according to claim 1, characterized in that The sealing gasket (12) has a first groove (311), the first groove (311) is located on the lower end surface of the sealing gasket (12), and the first groove (311) forms the first circulation passage (31); or, the step portion (115) includes a step portion bottom surface (1151), the step portion (115) has a first groove (311), the first groove (311) is located on the step portion bottom surface (1151), and the first groove (311) forms the first circulation passage (31); or, the sealing gasket (12 ) has a first groove, the first groove is located on the lower end surface of the sealing gasket (12), the step portion (115) includes a step portion bottom surface (1151), the step portion (115) has a second groove, the second groove is located on the step portion bottom surface (1151), the second groove is arranged opposite to the first groove, the first groove and the second groove cooperate to form the first flow passage (31); the valve device (100) has a first cavity (111), and the first flow passage (31) can be connected to the first cavity (111).

3. The valve device (100) according to claim 1 or 2, characterized in that: The valve device (100) further comprises a first sealing member (41), wherein the first sealing member (41) is located between the sealing gasket (12) and the valve seat component (11), the first sealing member (41) is compressed between the sealing gasket (12) and the valve seat component (11), and the first flow passage (31) is capable of connecting to a space or gap below or inside the first sealing member (41).

4. The valve device (100) according to claim 3, characterized in that The first seal (41) is located between the outer peripheral portion of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11) in the radial direction of the valve device (100), and the first seal (41) is pressed between the outer peripheral portion of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11), and the first flow passage (31) can connect to the space or gap on the lower side of the first seal (41).

5. The valve device (100) according to claim 3, characterized in that The valve device (100) has a second flow passage (32), and the second flow passage (32) is connected to the space or gap on the upper side or the outer side of the first sealing member (41); the valve device (100) includes a valve body cavity (1013), and the second flow passage (32) can be connected to the valve body cavity (1013).

6. The valve device (100) according to claim 5, characterized in that The second flow passage (32) includes a first through hole (321), the first through hole (321) is located on the side wall of the valve seat component (11), the first through hole (321) penetrates the valve seat component (11) along the radial direction of the valve device (100), and the first through hole (321) has an opening on the outer side wall of the valve seat component (11).

7. The valve device (100) according to claim 5, characterized in that The valve seat component (11) includes a first valve seat component (51) and a second valve seat component (52), the first valve seat component (51) and the second valve seat component (52) are fixedly connected, the second flow passage (32) includes a first through hole (321) and a first gap (322), the first through hole (321) is located on the side wall of the first valve seat component (51), the first through hole (321) has an opening on the outer side wall of the first valve seat component (51), the first through hole (321) passes through the first valve seat component (51) along the radial direction of the valve device (100), the first gap (322) is located between the first valve seat component (51) and the second valve seat component (52), and the first gap (322) can be connected to the first through hole (321).

8. The valve device (100) according to any one of claims 3 to 7, characterized in that: The valve seat component (11) includes a limiting portion (114), the limiting portion (114) abuts against the upper end surface of the sealing gasket (12), and the lower end surface of the limiting portion (114) and / or the upper end surface of the sealing gasket (12) form a third groove, and the third groove connects the space or gap between the outer peripheral portion of the sealing gasket (12) and the inner peripheral wall of the valve seat component (11), and the third groove forms a second flow passage (32), or the third groove forms part of the second flow passage (32).

9. The valve device (100) according to any one of claims 4 to 7, characterized in that: The valve device (100) further comprises a screw portion (15) and a rotor assembly (14), wherein the rotor assembly (14) is capable of driving the screw portion (15) to move; the screw portion (15) is connected to the valve needle (2), and the screw portion (15) is capable of causing the valve needle (2) to move relative to the valve port (121); or, the valve device (100) further comprises a second valve needle (21), wherein the screw portion (15) is connected to the second valve needle (21), the valve needle (2) has a second valve port (22), the screw portion (15) is capable of causing the second valve needle (21) to move relative to the valve port (121), and the second valve needle (21) is capable of driving the valve needle (2) to move relative to the valve port (121).

10. The valve device (100) according to claim 9, characterized in that The sealing gasket (12) is made of a non-metallic material, and the valve needle (2) abuts against the upper end surface of the sealing gasket (12), or the valve needle (2) abuts against the inner side surface of the sealing gasket (12).

11. The valve device (100) according to claim 10, characterized in that The valve seat component (11) has a channel (113), and the valve seat component (11) also includes a valve seat cavity (116), at least a portion of the valve needle (2) is located in the valve seat cavity (116), and the channel (113) is connected to the valve seat cavity (116). The valve device (100) also includes a second sealing member (42) and a third sealing member (43), the second sealing member (42) is located on the lower side of the channel (113), and the third sealing member (43) is located on the upper side of the channel (113). The valve device (100) also includes a valve body (101), and the second sealing member (42) is pressed between the valve seat component (11) and the valve body (101). The second sealing member (42) is pressed between the valve seat component (11) and the valve body (101).

12. A valve device (100), characterized in that: The valve device (100) comprises a valve needle (2), a valve seat component (11) and a sealing gasket (12); the sealing gasket (12) is installed on the valve seat component (11); the sealing gasket (12) has a valve port (121); the valve needle (2) can cooperate with the sealing gasket (12) to adjust the flow area of ​​the valve port (121); the valve seat component (11) has a step portion (115); the lower end surface of the sealing gasket (12) abuts against the step portion (115); the valve device (100) has a second flow passage (32); the second flow passage (32) can connect the space or gap formed between the sealing gasket (12) and the valve seat component (11).

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