Valve device

Abstract

The valve seat member (11) of the valve device (100) has a stepped portion (115), the lower end surface of the gasket (12) abuts against the stepped portion (115), and there is a first flow passage (31) between the lower end surface of the gasket (12) and the stepped portion (115). This first flow passage (31) can communicate with the space or gap formed between the gasket (12) and the valve seat member (11). By arranging it in this way, the refrigerant in this space or gap is discharged through the first flow passage (31), thereby avoiding adverse effects due to the accumulation of refrigerant and improving the reliability of the sealing of the valve device (100). Other valve devices (100) have a second flow passage (32) which can communicate with the space or gap formed between the gasket (12) and the valve seat member (11). This arrangement similarly avoids adverse effects due to the accumulation of refrigerant and improves the reliability of the sealing of the valve device (100).

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on June 12, 2023, with an application number of 2023106943639 and an invention title of "Valve Device", and all of its content is incorporated herein by reference.

[0002] [[ID=*]] The present invention relates to the technical field of fluid control, and specifically relates to a valve device.

Background Art

[0003] The valve device includes a valve needle and a valve seat member. The valve seat member has a gasket, the gasket has a valve port, and the valve needle cooperates with the valve port portion to adjust the flow state of the valve port. In related technologies, there is an installation gap or installation space between the gasket and the main body portion of the valve seat member. The refrigerant accumulates in the installation gap or installation space, and the pressure change due to the refrigerant state at this location may affect the shape or position of the gasket, and further may affect the sealing reliability of the valve device.

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=2 *]] The object of the present invention is to provide a valve device that can improve the sealing reliability of the valve device.

Means for Solving the Problems

[0005] To achieve the above object, the valve device of the present invention includes a valve needle, a valve seat member and a gasket. The gasket is attached to the valve seat member and has a valve port. The valve needle cooperates with the gasket to adjust the flow area of the valve port. The valve seat member has a stepped portion, the lower end surface of the gasket abuts against the stepped portion, and there is a first flow passage between the lower end surface of the gasket and the stepped portion. The first flow passage can communicate with a space or gap formed between the gasket and the valve seat member. It should be noted that there are some repeated tags in the original text which seem to be errors. I have translated the text as accurately as possible while keeping those tags as they are. If you have any further questions or need more clarification, please feel free to ask.

[0006] Furthermore, the valve device of the present invention includes a valve needle, a valve seat member, and a gasket, wherein the gasket is attached to the valve seat member and has a valve opening, the valve needle works in cooperation with the gasket to adjust the flow area of ​​the valve opening, the valve seat member has a stepped portion, the lower end surface of the gasket abuts against the stepped portion, the valve device has a second flow passage, the second flow passage is able to communicate with a space or gap formed between the gasket and the valve seat member. [Effects of the Invention]

[0007] The valve seat member of the valve device according to the present invention has a stepped portion, the lower end surface of the gasket abuts against the stepped portion, and there is a first flow passage between the lower end surface of the gasket and the stepped portion. The first flow passage can communicate with the space or gap formed between the gasket and the valve seat member. By arranging it in this way, the refrigerant in the space or gap is discharged through the first flow passage, thereby avoiding adverse effects due to the accumulation of refrigerant and improving the reliability of sealing of the valve device.

[0008] Another embodiment of the present invention provides a valve device having a second flow passage, which is capable of communicating with a space or gap formed between the gasket and the valve seat member, and this arrangement similarly avoids adverse effects due to the accumulation of refrigerant and improves the reliability of the seal of the valve device. [Brief explanation of the drawing]

[0009] [Figure 1] A front view of the first embodiment of the valve device of the present invention from one viewing angle. [Figure 2] A cross-sectional view of the valve device in Figure 1, along the AA plane. [Figure 3] Structural diagram of the valve member from one viewing angle in Figure 2. [Figure 4] Cross-sectional view of the valve member shown in Figure 3, along the BB surface. [Figure 5] This is an enlarged structural view of part A in Figure 4. [Figure 6] Cross-sectional view of the valve member from a different viewing angle in Figure 3. [Figure 7] A stereoscopic view of the first valve seat member from one viewing angle. [Figure 8] Front view of the first valve seat member from one viewing angle in Figure 7. [Figure 9] A cross-sectional view of the first valve seat member along the CC surface in Figure 8. [Figure 10] A partially enlarged view of part A in another embodiment of the first embodiment of the valve device. [Figure 11] A cross-sectional view of another embodiment of the first embodiment of the valve device. [Modes for carrying out the invention]

[0010] The present invention will be further explained below with reference to Figures 1 to 11 and specific embodiments, and many specific details will be mentioned in the following detailed description in order to thoroughly understand the present invention. However, the specific units, devices, and features shown in the drawings are illustrative, not limiting.

[0011] The valve device 100 of the present invention is applied to a vehicle thermal management system or an air conditioning system, particularly a circulating system using CO2 as a refrigerant, and this vehicle thermal management system includes a new energy vehicle thermal management system, and generally the valve device 100 is used as a throttling element or switching element in the vehicle thermal management system.

[0012] The valve device 100 shown in Figures 1 to 11 includes a valve member 1, a valve body 101, and a coil unit 102. The valve member 1 is fixedly connected to the valve body 101, the coil unit 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 member 1 is located in the valve body cavity 1013. Of course, in other embodiments, the coil unit 102 may be fixedly connected to the valve member 1, and after both are installed, they may be fixedly connected to the valve body 101. Furthermore, the valve body 101 in this embodiment is an individual valve block, while the valve body 101 in other embodiments may be part of a system, such as a heat exchanger or a flow path plate. Furthermore, the coil unit 102 includes a stator unit, and the valve member 1 includes a valve seat member 11, a sleeve 13, and a rotor unit 14. The sleeve 13 is fixed and connected to the valve seat member 11, the stator unit 1021 is located outside the sleeve 13, and the rotor unit 14 is located inside the sleeve 13. Furthermore, the valve member 1 further includes a screw rod portion 15 and a nut unit 16. The screw rod portion 15 is fixed and connected to the rotor unit 14 and is screw-engaged with the nut unit 16, thereby passing a predetermined current through the stator unit 1021 to generate an excitation magnetic field, which rotates the rotor unit 14, and the rotor unit 14 can rotate the screw rod portion 15. The screw rod portion 15 can move the subsequent valve needle 2 relative to the valve opening 121.

[0013] The valve device 100 of the first embodiment shown in Figures 1 to 9 includes a valve seat member 11 and a gasket 12; that is, the valve member 1 includes a valve seat member 11 and a gasket 12. The gasket 12 is attached to the valve seat member 11 and has a valve opening 121. Furthermore, the valve member 1 includes a screw rod portion 15 and a rotor unit 14. In this embodiment, the screw rod portion 15 is fixedly connected to the rotor unit 14, and the rotor unit 14 can operate the screw rod portion 15. The valve member 1 includes a valve needle 2 and a second valve needle 21. The screw rod portion 15 is connected to the second valve needle 21. The valve needle 2 has a second valve port 22. The screw rod portion 15 acts the second valve needle 21 relative to the second valve port 22, and the second valve needle 21 acts the valve needle 2 relative to the valve port 121, adjusting the flow area of ​​the valve port 121 and further adjusting the refrigerant flow rate of the valve port 121. In this embodiment, the screw rod portion 15 is connected to the second valve needle 21. Further, a bearing member is provided at the connection portion between the screw rod portion 15 and the second valve needle 21. The lower end portion of the screw rod portion 15 forms a caulking portion (not shown) that supports the lower end surface of the bearing member by caulking and crimping. In this embodiment, the valve needle 2 abuts on the upper end surface of the gasket 12 to close the valve port 121. In other embodiments, the valve needle 2 may abut on the inner side surface of the gasket 12 to close the valve port 121. The gasket 12 is made of a non-metallic material. The material of the gasket 12 in this embodiment includes a resin material. And, it is not excluded that this gasket 12 contains impurities or other small amounts of specific metal components. The resin material may be, for example, PTFE (Polytetrafluoroethylene), peek (polyether ether ketone), PPS (polyphenylene sulfide), etc. In other embodiments, the gasket 12 may have a composite structure of a resin material and a rubber material. For example, the side of the gasket 12 that abuts on the valve needle 2 is a resin material layer, and the lower side of the resin material layer is a rubber material layer. Referring to FIG. 11, in the valve member 1 in other embodiments, the second valve needle 21 is not provided. The screw rod portion 15 is connected to the valve needle 2, and this valve needle 2 can be operated with respect to the valve port 121. The valve needle 2 and the gasket 12 cooperate to adjust the flow area of the valve port 121 and further adjust the flow rate of the refrigerant.

[0014] As shown in FIGS. 2 to 6, the valve seat member 11 in the first embodiment has a valve seat cavity 116, and at least a part of the valve needle 2 is located in the valve seat cavity 116. This valve seat cavity 116 includes a first valve cavity 111 and a second valve cavity 112. Furthermore, the first valve cavity 111 is located below the second valve cavity 112. When the valve needle 2 contacts the valve opening 121, the first valve cavity 111 and the second valve cavity 112 are not in communication. When the valve needle 2 and the valve opening 121 are separated, the first valve cavity 111 and the second valve cavity 112 become in communication.

[0015] As shown in Figures 2 to 6, the valve seat member 11 in the first embodiment has several passages 113, which are distributed at intervals along the circumferential direction of the valve seat member 11, and the passages 113 communicate with the valve seat cavity 116, specifically the second valve cavity 112 of the valve seat cavity 116. The valve device 100 further 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 passage 113, and the third sealing member 43 is located on the upper side of the passage 113. The second sealing member 42 is tightened between the valve seat member 11 and the valve body 101, and the third sealing member 43 is tightened between the valve seat member 11 and the valve body 101. The valve body 101 includes a first flow path 1011 and a second flow path 1012. Furthermore, the first flow path 1011 may function as a refrigerant inlet passage, and the second flow path 1012 may function as a refrigerant outlet passage, or they may function in the opposite way. In this embodiment, the first valve cavity 111 communicates with the first flow path 1011, and the second valve cavity 112 communicates with the second flow path 1012 via the passage 113. The first flow path 1011 and the second flow path 1012 are connected by the valve opening 121, which controls the flow rate by switching between connection and disconnection.

[0016] In this embodiment shown in Figures 2 to 6, the valve seat member 11 has a stepped portion 115, the lower end surface of the gasket 12 abuts against the stepped portion 115, and there is a first flow passage 31 between the lower end surface of the gasket 12 and the stepped portion 115, and the first flow passage 31 can communicate with the space or gap formed between the gasket 12 and the valve seat member 11. In this embodiment, one end of the first flow passage 31 communicates with the space or gap formed between the gasket 12 and the valve seat member 11, and the other end communicates with the first valve cavity 111 of the valve seat member 11. By arranging them in this way, the refrigerant that accumulates in the space or gap formed between the gasket 12 and the valve seat member 11 will change pressure due to a change in state, which will affect the shape or position of the gasket 12 and thus avoid affecting the reliability of the seal of the valve device 100. For example, the refrigerant accumulated in the space or gap formed between the gasket 12 and the valve seat member 11 expands due to heat, creating pressure that causes the gasket 12 to shift position or deform. In this case, the contact position between the valve needle 2 and the gasket 12 may change, and the amount of leakage at the contact point will increase. By arranging the first flow passage 31, this situation can be avoided. In other embodiments, a valve seat member 11 is formed on the valve body 101, and a stepped portion 115 is formed on this valve seat member 11. The lower end surface of the gasket 12 abuts against the stepped portion 115, and a first flow passage 31 is provided between the lower end surface of the gasket 12 and the stepped portion 115. In this embodiment, the valve seat member 11 has a position limiting portion 114, which abuts against the upper end surface of the gasket 12, and the gasket 12 is tightened between the position limiting portion 114 and the stepped portion 115. Other mounting configurations may be used for the gasket 12.

[0017] In this embodiment shown in Figures 2 to 6, the valve seat member 11 and the valve body 101 are relatively independent, and the valve seat member 11 and the valve body 101 are fixedly connected, with connection methods including screw connection and crimping. The valve seat member 11 may be a separate component, and the separate component may be fixed and connected to form the valve seat member 11, or the valve seat member 11 may be an integrally molded structure. An embodiment in which the valve seat member 11 has a separate structure will be described. In this embodiment, the valve seat member 11 includes a first valve seat member 51, a second valve seat member 52, and a third valve seat member 53. The first valve seat member 51 and the second valve seat member 52 are molded separately and fixed together by welding, crimping, or other methods, while the second valve seat member 52 and the third valve seat member 53 are molded separately and fixed together by welding, crimping, or other methods.

[0018] In this embodiment shown in Figures 2 to 6, the stepped portion 115 includes a stepped portion bottom surface 1151 and a stepped portion side surface 1152. The stepped portion bottom surface 1151 is formed on the first valve seat member 51, and the lower end surface of the gasket 12 abuts against the stepped portion bottom surface 1151. In this embodiment, the stepped side surface 1152 includes a part of the first valve seat member 51 and a part of the second valve seat member 52. In other embodiments, the stepped side surface 1152 may be formed solely from the first stepped portion 115, or solely from the second valve seat member 52.

[0019] The valve device 100 of this embodiment, shown in Figures 2 to 6, further includes a first sealing member 41. The first sealing member 41 is positioned between the gasket 12 and the valve seat member 11 and is fastened between the gasket 12 and the valve seat member 11, and the first flow passage 31 is able to communicate with the space or gap below or inside the first sealing member 41.

[0020] In the valve device 100 of this embodiment shown in Figures 2 to 6, the first sealing member 41 is located radially between the outer periphery of the gasket 12 and the inner periphery wall of the valve seat member 11, and is tightened between the outer periphery of the gasket 12 and the inner periphery wall of the valve seat member 11, and the first flow passage 31 is able to communicate with the space or gap below the first sealing member 41. By arranging the components in this manner, the space or gap below the first sealing member 41 communicates with the first valve cavity 111 via the first flow passage 31. The first flow passage 31 prevents refrigerant from accumulating in the space or gap below the first sealing member 41, thus preventing the pressure from accumulated refrigerant from causing deformation or displacement of the gasket 12, which would affect the sealing performance of the valve opening 121 when the valve is closed, and thus preventing an increase in the amount of leakage from the valve opening 121. For example, it prevents the refrigerant accumulated in the space or gap below the first sealing member 41 from expanding due to heat generation, and further generating pressure that could shift or deform the valve opening 121. In this embodiment, the first sealing member 41 is fastened between the gasket 12 and the stepped side surface 1152, and the space between the gasket 12 and the stepped side surface 1152 is sealed by the first sealing member 41. In other embodiments of this model, the first sealing member 41 may be provided between the lower end surface of the gasket 12 and the bottom surface 1151 of the stepped portion. In this case, the first circulation passage 31 prevents refrigerant from accumulating in the space or gap inside the first sealing member 41. Of course, the first sealing member 41 may also satisfy the two arrangement methods described above.

[0021] In one specific embodiment of the first embodiment shown in Figures 2 to 6, the stepped bottom surface 1151 has a first groove 311, which is located on the stepped bottom surface 1151 and is positioned to be recessed from the stepped bottom surface 1151, back-to-back with the gasket 12, and the first groove 311 forms a first flow passage 31, which can communicate with the space or gap below the first sealing member 41. Here, the number of first grooves 311 may be one or more.

[0022] In another embodiment of the first embodiment shown in Figure 10, the gasket 12 in this embodiment has a first groove 311, compared to the previous embodiment. The first groove 311 is located on the lower end surface of the gasket 12 and is positioned back-to-back with the stepped bottom surface 1151 from the lower end surface of the gasket 12. The first groove 311 forms a first flow passage 31, which can be connected to the lower space or gap of the first sealing member 41. The number of first grooves 311 may be one or more.

[0023] In a further embodiment of the first embodiment, the gasket 12 in this embodiment has a first groove compared to the above embodiment. Furthermore, this first groove is located on the lower end surface of the gasket 12, the stepped portion 115 includes the stepped portion bottom surface 1151, and the stepped portion 115 further has a second groove (not shown). Furthermore, this second groove is located on the bottom surface 1151 of the stepped portion and is positioned opposite the first groove, forming a first flow passage 31 such that the first groove and the second groove engage with each other. There are several first-order grooves, and several second-order grooves.

[0024] The valve device 100 of the first embodiment shown in Figures 2 to 6 further has a second flow passage 32, the second flow passage 32 is able to communicate with the space or gap above or outside the first sealing member 41. The function of the second circulation passage 32 is the same as that of the first circulation passage 31, and in both cases, the refrigerant accumulates, thus avoiding displacement or deformation of the gasket 12. The first distribution channel 31 and the second distribution channel 32 can work together to achieve better results. In this embodiment, the fact that the second flow passage 32 communicates with the upper space or gap of the first sealing member 41 will be described in detail.

[0025] The valve seat member 11 of this embodiment, shown in Figures 2 to 9, includes a first valve seat member 51 and a second valve seat member 52. The first valve seat member 51 and the second valve seat member 52 are fixedly connected, and the fixing connection method includes welding and interference fit. The example of welding will be used to further illustrate this point. The second flow passage 32 includes a first through hole 321 and a first gap 322. The first through hole 321 is located in the side wall of the first valve seat member 51, and has an opening in the outer wall of the first valve seat member 51. The first through hole 321 penetrates the first valve seat member 51 along the radial direction of the valve device 100. In this embodiment, the first valve seat member 51 has a first extension 511, and the first through hole 321 is provided in the first extension 511. The first gap 322 is located between the first valve seat member 51 and the second valve seat member 52 and is able to communicate with the first through hole 321. In this embodiment, the second valve seat member 52 has a second extension 521, at least a portion of which is located inside the first valve seat member 51. The first gap 322 is the gap between the lower end surface of the second extension 521 and the first valve seat member 51, and may further include the gap between the outer surface of the second extension 521 and the first valve seat member 51. The first through-hole 321 can communicate with the space or gap above the first sealing member 41 via the first gap 322. In this embodiment, the first valve seat member 51 and the second valve seat member 52 are fixed and connected by welding, and a welded joint is formed between the top surface of the first extension portion 511 and the second valve seat member 52 by welding. In this embodiment, the welding method is laser welding, but in other embodiments, a welding method such as soldering may be used.

[0026] In contrast to the above embodiment, in another embodiment of this embodiment, the first through-hole 321 may not be provided. The first extended portion 511 of the first valve seat member 51 and the second valve seat member 52 are welded together to form a welded joint, which is installed to form an incomplete circle. Several gaps are provided between the welded joints, which constitute a part of the first flow passage 31 and act as a substitute for the first through-hole 321 in the above embodiment.

[0027] In a further embodiment of this example, the first flow passage 31 includes a first through hole 321. The first through-hole 321 is located in the side wall of the valve seat member 11 and penetrates the valve seat member 11 along the radial direction of the valve device 100. The first through-hole 321 has an opening in the outer wall of the valve seat member 11 and communicates directly with the space or gap above the first sealing member 41.

[0028] In other embodiments of this embodiment, the valve seat member 11 includes a position limiting portion 114. Specifically, in this embodiment, the second valve seat member 52 includes a position limiting portion 114, which abuts against the upper end surface of the gasket 12, and the lower end surface of the position limiting portion 114 and / or the upper end surface of the gasket 12 form a third groove (not shown). Furthermore, this third groove communicates with the space or gap between the outer periphery of the gasket 12 and the inner periphery wall of the valve seat member 11, forming a second flow passage 32, or the third groove forms a part of the second flow passage 32. The fact that the third groove forms the second flow passage 32 means that the second flow passage 32 mentioned in the above embodiment does not necessarily need to be provided. The fact that the third groove forms part of the second flow passage 32 means that, in the above embodiment, the second flow passage 32 is provided, and then the third groove is added as part of the second flow passage 32, that is, the second flow passage 32 is composed of multiple parts. Furthermore, through holes may be provided that penetrate the position limiting portion 114 along the axial direction of the valve device, and such through holes are connected to the third groove or communicate directly with the space or gap above the first sealing member 41.

[0029] In the first embodiment of the electric valve described above, the first sealing member 41 is provided, and assuming that the sealing between the gasket 12 and the stepped portion 115 is satisfied, the first sealing member 41 may be omitted.

[0030] A second embodiment of the present invention, the valve device 100, includes a valve needle 2, a valve seat member 11, and a gasket 12. The gasket 12 is attached to the valve seat member 11 and has a valve opening 121, and the valve needle 2 works in cooperation with the gasket 12 to adjust the flow area of ​​the valve opening 121. The valve device 100 has a second flow passage 32, which is able to communicate with the space or gap formed between the gasket 12 and the valve seat member 11, and the second flow passage 32 is specifically the same as the second flow passage 32 involved in the above embodiment. In this embodiment, only the second flow passage 32 may be provided, or the first flow passage 31 may be further provided above the second flow passage 32. Specific embodiments are obtained by combining the structures in the above embodiment and are not described in detail here. In this embodiment, the first sealing member 41 is provided, and assuming that the airtightness between the gasket 12 and the stepped portion 115 is satisfied, the first sealing member 41 may be omitted.

[0031] The embodiments described above are used to illustrate the present invention without limiting it, but modifications or equivalent substitutions may be made to the present invention, and any improvements that do not depart from the spirit and scope of the invention will fall within the scope of the claims of the present invention.

Claims

1. A valve device (100) including a valve needle (2), a valve seat member (11), and a gasket (12), The gasket (12) is attached to the valve seat member (11) and has a valve opening (121). The valve needle (2) works in cooperation with the gasket (12) to adjust the flow area of ​​the valve opening (121), The valve seat member (11) has a stepped portion (115), The lower end surface of the gasket (12) is in contact with the stepped portion (115), A first flow passage (31) is provided between the lower end surface of the gasket (12) and the stepped portion (115). The valve device (100) is characterized in that the first flow passage (31) can communicate with the space or gap formed between the gasket (12) and the valve seat member (11).

2. The gasket (12) has a first groove (311), The first groove (311) is located on the lower end surface of the gasket (12) and forms the first flow passage (31), or the stepped portion (115) includes the stepped portion bottom surface (1151), The stepped portion (115) has a first groove (311), The first groove (311) is located on the bottom surface (1151) of the stepped portion and forms the first flow passage (31), or the gasket (12) has the first groove, The first groove is located on the lower end surface of the gasket (12), The stepped portion (115) includes the stepped portion bottom surface (1151), The stepped portion (115) further has a second groove, The second groove is located on the bottom surface (1151) of the stepped portion and is positioned opposite to the first groove. The first groove and the second groove are designed to engage with each other to form the first flow passage (31), The valve device (100) has a first cavity (111), The valve device (100) according to claim 1, characterized in that the first flow passage (31) is able to communicate with the first cavity (111).

3. The valve device (100) further includes a first sealing member (41), The first sealing member (41) is positioned between the gasket (12) and the valve seat member (11) and is fastened between the gasket (12) and the valve seat member (11). The valve device (100) according to claim 1 or 2, characterized in that the first flow passage (31) is able to communicate with a space or gap below or inside the first sealing member (41).

4. In the radial direction of the valve device (100), the first sealing member (41) is positioned between the outer periphery of the gasket (12) and the inner circumferential wall of the valve seat member (11), and is tightened between the outer periphery of the gasket (12) and the inner circumferential wall of the valve seat member (11). The valve device (100) according to claim 3, characterized in that the first flow passage (31) is able to communicate with the space or gap below the first sealing member (41).

5. The valve device (100) has a second flow passage (32), The second flow passage (32) is capable of communicating with the space or gap above or outside the first sealing member (41), The valve device (100) includes a valve body cavity (1013), The valve device (100) according to claim 3, characterized in that the second flow passage (32) is able to communicate with the valve body cavity (1013).

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

7. The valve seat member (11) includes a first valve seat member (51) and a second valve seat member (52) that are fixed and connected. The second flow passage (32) includes a first through hole (321) and a first gap (322), The first through-hole (321) is located in the side wall of the first valve seat member (51), has an opening in the outer wall of the first valve seat member (51), and penetrates the first valve seat member (51) along the radial direction of the valve device (100). The valve device (100) according to claim 5, characterized in that the first gap (322) is located between the first valve seat member (51) and the second valve seat member (52) and is able to communicate with the first through hole (321).

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

9. The valve device (100) further includes a screw rod section (15) and a rotor unit (14), The rotor unit (14) is capable of operating the screw rod portion (15), The screw rod portion (15) is connected to the valve needle (2) and is capable of operating the valve needle (2) relative to the valve port (121), or the valve device (100) further includes a second valve needle (21), The screw rod portion (15) is connected to the second valve needle (21), and the valve needle (2) has a second valve port (22). The screw rod portion (15) is capable of moving the second valve needle (21) relative to the valve opening (121), The valve device (100) according to any one of claims 4 to 7, characterized in that the second valve needle (21) is capable of operating the valve needle (2) relative to the valve port (121).

10. The gasket (12) is manufactured from a non-metallic material. The valve device (100) according to claim 9, characterized in that the valve needle (2) is in contact with the upper end surface or inner surface of the gasket (12).

11. The valve seat member (11) has a passage (113), The valve seat member (11) further includes a valve seat cavity (116), At least a portion of the valve needle (2) is located in the valve seat cavity (116), The passage (113) communicates with the valve seat cavity (116), The valve device (100) further 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 passage (113), The third sealing member (43) is located on the upper side of the passage (113), The valve device (100) further includes a valve body (101), The second sealing member (42) is fastened between the valve seat member (11) and the valve body (101). The valve device (100) according to claim 10, characterized in that the second sealing member (42) is fastened between the valve seat member (11) and the valve body (101).

12. A valve device (100) including a valve needle (2), a valve seat member (11), and a gasket (12), The gasket (12) is attached to the valve seat member (11) and has a valve opening (121). The valve needle (2) works in cooperation with the gasket (12) to adjust the flow area of ​​the valve opening (121), The valve seat member (11) has a stepped portion (115), The lower end surface of the gasket (12) is in contact with the stepped portion (115), The valve device (100) has a second flow passage (32), The valve device (100) is characterized in that the second flow passage (32) can communicate with the space or gap formed between the gasket (12) and the valve seat member (11).

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