Valve device

Abstract

In the valve device provided by the embodiment of the invention, a valve element assembly comprises a valve element main body and a guide part, the guide part is provided with a guide hole, a rod part comprises an extension part, at least part of the extension part is located in the guide hole, and the extension part is in guide fit with the guide part. In this way, deflection of the valve element assembly is prevented, the coaxiality of the valve element assembly and the valve port is improved, and therefore the precision of the valve device is improved.

Description

Technical Field

[0001] This application relates to the technical field of fluid control, and particularly relates to a valve device. Background Art

[0002] The valve device includes a rotor assembly, a valve stem part, a valve seat assembly, and a valve core assembly. The rotor assembly can drive the lead screw part to rotate. The valve seat assembly has a valve port. The lead screw part can drive the valve core assembly to axially move relative to the valve port. However, in the related art, the deflection angle of the valve core assembly relative to the valve port is relatively large, and the coaxiality between the valve core assembly and the valve port is poor, resulting in a reduction in the accuracy of the valve device. Summary of the Invention

[0003] The purpose of this application is to provide a valve device that is beneficial to preventing the deflection of the valve core assembly.

[0004] To achieve the above purpose, an embodiment of this application adopts the following technical solution:

[0005] A valve device, the valve device includes a rod member and a valve core assembly. The valve core assembly includes a valve core body and a guiding part. The valve core body and the guiding part are of an integral structure, or fixedly connected, or limitedly connected. The guiding part has a guiding hole. The rod member includes an extending part, and at least part of the extending part is located in the guiding hole, and the extending part is in guiding cooperation with the guiding part.

[0006] In the valve device provided by the embodiment of this application, the valve core assembly includes a valve core body and a guiding part. The guiding part has a guiding hole. The rod member includes an extending part, and at least part of the extending part is located in the guiding hole, and the extending part is in guiding cooperation with the guiding part. This is beneficial to preventing the deflection of the valve core assembly, improving the coaxiality between the valve core assembly and the valve port, and thus improving the accuracy of the valve device. Brief Description of the Drawings

[0007] Figure 1 is the front view structural schematic diagram of the first embodiment of the valve device provided by this application;

[0008] Figure 2 is Figure 1 the sectional view structural schematic diagram of the valve device in [Figure 28] along the A-A plane;

[0009] Figure 3 is Figure 1 the sectional view structural schematic diagram of another perspective of the valve device in [Figure 34] (valve closed state);

[0010] Figure 4 is Figure 1 the sectional view structural schematic diagram of another perspective of the valve device in [Figure 40] (valve open state);

[0011] Figure 5 is Figure 2Schematic diagram of the three-dimensional structure of a perspective of the middle spool assembly;

[0012] Figure 6 is Figure 5 Schematic diagram of the three-dimensional structure of a perspective of the structure of the middle spool assembly with the mounting ring removed;

[0013] Figure 7 is Figure 6 Schematic diagram of the sectional structure of a perspective of the middle structure;

[0014] Figure 8 is Figure 7 Schematic diagram of the three-dimensional structure of a perspective of the nut member;

[0015] Figure 9 Schematic diagram of the sectional structure of a variant of the first embodiment of the valve device provided by the present application;

[0016] Figure 10 Schematic diagram of the sectional structure of a perspective of the second embodiment of the valve device provided by the present application;

[0017] Figure 11 Schematic diagram of the sectional structure of a perspective of the third embodiment of the valve device provided by the present application;

[0018] Figure 12 Schematic diagram of the sectional structure of a perspective of the fourth embodiment of the valve device provided by the present application;

[0019] Figure 13 is Figure 12 Schematic diagram of the front view structure of a perspective of the rod member;

[0020] Figure 14 is Figure 12 Schematic diagram of the front view structure of a perspective of another embodiment of the rod member;

[0021] Figure 15 Schematic diagram of the sectional structure of a perspective of the fifth embodiment of the valve device provided by the present application. Detailed implementation mode

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. In order to fully understand the present invention, numerous specific details are mentioned in the following detailed description. However, those skilled in the art should understand that the specific components, devices and features illustrated in the drawings and described herein are merely exemplary and should not be considered as limiting.

[0023] Refer to Figures 1 - 3, the valve device 1 can be applied to vehicle, household or commercial air conditioning systems, and can also be used in battery cooling systems and other systems that require thermal management in the fields of vehicles and the like. In the above-mentioned various types of systems, the valve device 1 generally serves as a throttling element or a switching element, or as an element with both throttling and switching functions. In this application, a valve device 1 that can be applied to a circulation system using CO2 as a refrigerant is taken as an example for illustration.

[0024] Reference Figures 1 - 3 , an embodiment of a valve device 1 is schematically introduced. The valve device 1 can be part of an electric valve, and the electric valve further includes a coil assembly (not shown in the figure) and a valve body (not shown in the figure). The valve device 1 includes a valve seat assembly 15 and a sleeve 16. The sleeve 16 is fixedly connected to the valve seat assembly 15 and is sealed at the connection between the two. The connection methods include welding, bonding, etc. The valve body can be a separate valve block or part of other components. For example, it can be part of a heat exchanger or a flow channel plate in a cooling system. When the valve body is a separate valve block, the valve device 1 can be first fixedly connected to the valve body, and then the coil assembly is sleeved on the outer periphery of the valve device 1. The coil assembly is fixedly connected to the valve body, and the connection methods include screw connection, snap connection, etc.

[0025] Reference Figures 1 - 8, the valve device 1 further includes a rod member 11, a valve core assembly 12, a rotor assembly 13, and a support member 14. The rotor assembly 13 is located in the inner cavity formed by the sleeve 16. The valve seat assembly 15 has a valve seat inner cavity 152, and at least part of the valve core assembly 12 is located in the valve seat inner cavity 152. The rod member 11 is connected to the rotor assembly 13, and the connection methods include welding connection, clamping, etc. In this embodiment, the support member 14 has an internal thread, and the support member 14 is fixedly connected to the valve seat assembly 15, and the connection methods include welding, clamping, etc. The rod member 11 has a second external thread portion 111b. The support member 14 is sleeved on the rod member 11, and the second external thread portion 111b of the rod member 11 is in threaded cooperation with the internal thread of the support member 14. In this application, the valve device 1 further includes a bearing member 4. The inner ring of the bearing member 4 is fixedly connected or limitedly connected to the rod member 11, and the outer ring of the bearing member 4 is connected to the valve seat assembly 15. The rod member 11 cannot move up and down relative to the bearing member 4 in the axial direction. By passing a predetermined current through the stator assembly, an exciting magnetic field can be generated to rotate the rotor assembly 13. The rotor assembly 13 can drive the rod member 11 to rotate. The rod member 11 is in threaded cooperation with the support member 14, so that the rod member 11 rotates circumferentially relative to the support member 14. The rod member 11 is in transmission cooperation with the valve core assembly 12, and the rod member 11 can cause the valve core assembly 12 to axially move up and down relative to the valve port 151 provided on the valve seat assembly 15, thereby adjusting the flow area of the valve port 151, and further adjusting the flow rate of the refrigerant in the cooling system. In this embodiment, the valve seat assembly 15 includes an inlet passage 153 and an outlet passage 154. The adjustment of the flow area between the inlet passage 153 and the outlet passage 154 is achieved by the cooperation of the valve core assembly 12 and the valve port 151. The valve device further includes a second elastic member 5. The lower end of the second elastic member 5 abuts against the valve core assembly 12, and the upper end abuts against the gasket 6. Of course, the upper end can also abut against the bearing member 4 or the rod member 11.

[0026] Reference Figures 1 - 8, in this embodiment, the rod member 11 includes a first mating portion 111, the spool assembly 12 includes a spool body 121 and a transmission mating portion 122, and the first mating portion 111 is in transmission cooperation with the spool assembly 12 through the transmission mating portion 122. In the specific embodiment provided by the present application, the first mating portion 111 includes an external thread portion 111a, the transmission mating portion 122 includes a nut member 122a, the nut member 122a has a threaded hole 122a1, the first mating portion 111 can be in threaded cooperation with the nut member 122a, and the nut member 122a is fixedly connected or limitedly connected to the spool body 121. This embodiment will be described with the nut member 122a being limitedly connected to the spool body 121. In this embodiment, the spool body 121 is generally cylindrical, the spool assembly 12 includes a spool cavity 125, and at least a part of the nut member 122a is located in the spool cavity 125. The spool assembly 12 further includes a mounting ring 126, the mounting ring 126 is fixedly connected to the spool body 121, and the fixed connection methods include welding and interference fit. The nut member 122a is limited by the mounting ring 126 to the spool body 121, and the nut member 122a can have a certain axial movement space relative to the spool body 121. The spool assembly 12 further includes a first elastic member 124, one end of the first elastic member 124 abuts against the lower end surface of the nut member 122a, and the other end abuts against the guiding portion 123. Such a setting can enable the first elastic member 123 to be compressed within a small range.

[0027] Reference Figures 1 - 8 , in the embodiment of the present application, since the first mating portion 111 is in transmission cooperation with the spool assembly 12 through the transmission mating portion 122, therefore, the spool assembly 12 can axially move relative to the valve port 151. In this embodiment, further, the nut member 122a further includes a limiting protrusion 122a2, the limiting protrusion 122a2 is a non-circular structure, the inner peripheral wall of the valve seat assembly 15 has a shape generally adapted to the outer periphery of the spool body 121, and the valve seat assembly 15 further has a limiting groove 155 adapted to the limiting protrusion 122a2 of the nut member 122a, and the limiting groove 155 is further recessed from the inner peripheral wall of the valve seat assembly 15. The limiting protrusion 122a2 of the nut member 122a extends into the limiting groove 155, and the limiting groove 155 restricts the circumferential rotation of the nut member 122a. Therefore, in this embodiment, the spool assembly 12 can only axially move up and down relative to the valve port 151 and cannot rotate relative to the valve port 151. Such a setting is beneficial to reducing the friction of the wall forming the valve port 151 and improving the service life of the valve device 1. In other embodiments, the transmission mating portion 122 can be a bearing. At this time, the first mating portion 111 can not be an external thread portion. For example, the first mating portion 111 can be a smooth section fixedly fitted with the inner ring of the bearing, and the outer ring of the bearing is fitted with the spool body 121, so as to realize the transmission cooperation between the rod member 11 and the spool assembly 12.

[0028] Combined with Figures 1 - 8, in the first embodiment of the present application, the valve core assembly 12 further includes a guiding portion 123. The guiding portion 123 and the valve core body 121 are of an integral structure, or are separately formed and then fixedly connected or limit-connected. The guiding portion 123 has a guiding hole 1231. The rod member 11 includes an extending portion 112, and at least a part of the extending portion 112 is located in the guiding hole 1231. The extending portion 112 is in guiding cooperation with the guiding portion 123. The extending portion 112 extends along the axial direction of the rod member 11, and a part of the extending portion 112 is located in the valve core cavity 125. The extending portion 112 is located below the first engaging portion 111. The guiding hole 1231 is coaxially arranged with the rod member 11. Refer to Figure 3 , Figure 4 , Figure 3 in which the valve device is in the closed valve state, Figure 4 in which the valve device is in the open valve state. During the operation of the valve device 1, there is always a part of the extending portion 112 located in the guiding hole 1231 and in guiding cooperation with the wall forming the guiding hole 1231. The extending portion 112 can always provide guidance for the wall forming the guiding hole 1231. With such an arrangement, the extending portion 112 of the rod member 11 can guide the guiding portion 123, preventing the valve core body 121 from deflecting relative to the extending portion 112, that is, preventing the valve core assembly 12 from deflecting relative to the rod member 11, and also reducing the deflection of the valve core assembly 12 relative to the valve port 151. Therefore, the coaxiality between the valve core assembly 12 and the valve port 151 can be improved, avoiding damage to the valve port 151, improving the accuracy of flow regulation, and reducing the flow leakage at the valve port 151 when closing the valve. At the same time, it also prevents the valve core assembly 12 from causing damage to the threads at the threaded engagement between the nut member 122a and the rod member 11 due to poor coaxiality with the rod member 11, thereby causing jamming.

[0029] In this embodiment, the extending portion 112 extends along the axial direction of the rod member 11, the guiding hole 1231 is coaxially arranged with the extending portion 112, and the guiding portion 123 is located at the lower end of the valve core assembly 12. Such an arrangement can be more beneficial to improving the coaxiality between the valve core assembly 12 and the valve port 151, reducing the deflection of the valve core assembly 12 relative to the valve port 151, and improving the accuracy of the valve device 1. In other embodiments, as Figure 9 shown, the position of the guiding portion 123 is between the first engaging portion 111 of the rod member 11 and the lower end of the valve core body 121. Such an arrangement can also improve the coaxiality between the valve core assembly 12 and the valve port 151, and at the same time can reduce the length of the rod member 11.

[0030] In this embodiment, the extension portion 112 is in clearance fit with the wall forming the guide hole 1231. Such a setting can not only play a guiding role to prevent the valve core assembly 12 from shaking or deflecting relative to the rod member 11, but also enable the valve core assembly 12 to move smoothly up and down axially relative to the extension portion 112. The inner diameter of the guide hole can be set, for example, to be about 0.1 mm larger than the outer diameter of the extension portion. Of course, in other embodiments, the extension portion 112 and the wall forming the guide hole 1231 can be in transitional fit, which can not only meet the requirements but also reduce the processing difficulty.

[0031] In this embodiment, the valve device 1 further includes a first balance channel 21. The valve core cavity 125 communicates with the space outside the guide portion 123 through the first balance channel 21. The valve core cavity 125 communicates with the first balance channel 21, and the valve core cavity 125 communicates with the space outside the guide portion 123 through the first balance channel 21. The valve device 1 further includes a second balance channel 22. The second balance channel 22 communicates with the spaces above and below the nut member 122a. Specifically, in this embodiment, the second balance channel 22 can communicate the valve core cavity 125 with the cavity where the rotor assembly 13 is located. The second balance channel 22 includes a reserved gap between the nut member 122a and the valve core body 121, and the reserved gap includes a reserved groove 1221 located on the outer periphery of the nut member 122a. In this embodiment, the valve core assembly 12 and the valve seat assembly 15 are sealed by a first seal portion 3. Therefore, setting the first balance channel 21 and the second balance channel 22 can communicate the space outside the guide portion 123 with the cavity where the rotor assembly 13 is located, thereby balancing the pressure between the space outside the guide portion 123 and the cavity where the rotor assembly 13 is located, which is beneficial to reducing the valve opening resistance and further can reduce the driving force of the electric valve.

[0032] In this embodiment, the first balance channel 21 is located in the guide portion 123, and at least part of the first balance channel 21 penetrates through the guide portion 123. At least part of the wall forming the first balance channel 21 is located in the guide portion 123. Such a setting can facilitate the processing of the first balance channel 21. In this embodiment, the first balance channel 21 is arranged offset from the guide hole 1231. The first balance channel 21 can be provided with one or more, and the shape can be, for example, circular, square, etc.

[0033] Reference Figure 10, in the second embodiment of the present application, the first balance channel 21 is located inside the extension portion 112. The first balance channel 21 includes a first opening 211 and a second opening 212. Along the axial direction of the guiding portion 123, the second opening 212 is located on one side of the guiding portion 123, and the first opening 211 is located on the other side of the guiding portion 123. The first opening 211 communicates with the valve core cavity 125, and the second opening 212 communicates with the space outside the guiding portion 123. In this embodiment, in a specific structure provided, the first balance channel 21 includes a radial channel 213 and an axial channel 214, and the axial channel 214 communicates with the radial channel 213. The first opening 211 communicates with the radial channel 213, the first opening 211 is located on the outer peripheral portion of the extension portion 112, and the second opening 212 is located on the bottom wall of the extension portion 112.

[0034] Reference Figure 11 , in the third embodiment of the present application, compared with the second embodiment, the first balance channel 21 is an inclined hole, and the inclined hole is inclined with respect to the axial direction of the extension portion 112. The first opening 211 and the second opening 212 are respectively located at both ends of the inclined hole. The first opening 211 communicates with the valve core cavity 125, and the second opening 212 communicates with the space outside the guiding portion 123. The processing of the inclined hole is relatively simple.

[0035] Combined with Figures 12 - 14 , in the fourth embodiment of the present application, the first balance channel 21 includes a preset gap between the wall forming the guiding hole 1231 and the extension portion 112. The wall forming the guiding hole 1231 has a groove, and / or, the outer peripheral wall of the extension portion 112 has a groove 21a, and the groove 21a constitutes the preset gap serving as the first balance channel 21. In this embodiment, the groove 21a includes a thread groove or a knurled groove, and the thread groove or the knurled groove can communicate the valve core cavity 125 with the space outside the guiding portion 123. It should be noted that the structures of the first, second, third, and fourth embodiments of the present application can be used alone or in combination with each other.

[0036] Reference Figure 15, in the fifth embodiment of the present application, compared with the first embodiment, the extension part 112 includes an extension part body 1121 and a guide sleeve 1122. The guide sleeve 1122 is sleeved on the outer periphery of the extension part body 1121. The guide sleeve 1122 is made of wear-resistant material, such as a material composed of PTFE (Polytetrafluoroethylene) and carbon powder. Of course, the wear-resistant material can also be wear-resistant resin materials such as peek. In this embodiment, the extension part body 1121 is provided with a mounting groove, and the extension part 112 is installed in the mounting groove. Setting the guide sleeve 1122 can improve the wear resistance and service life of the extension part 112, and the installation of the guide sleeve 1122 is relatively simple. In other embodiments, the extension part 112 can include an extension part body 1121 and a guide coating. The guide coating covers the outer peripheral surface of the extension part body 1121. The guide coating is made of wear-resistant material. Such a setting can also improve the wear resistance and service life of the extension part 112.

[0037] Reference Figure 11 , in the sixth embodiment of the present application, the guiding part 123 and the valve core body 121 are of a split structure. The guiding part 123 is fixedly connected or limitedly connected to the valve core body 121. The guiding part 123 is made of wear-resistant material. Such a setting can also improve the wear resistance and service life of the guiding part 123. Schematically, in this embodiment, the guiding part 123 is in interference fit and limited connection with the valve core body 121. The valve core body 121 has a supporting protrusion 1211. The top surface of the supporting protrusion 1211 of the guiding part 123 abuts, and the guiding part 123 and the supporting protrusion 1211 are in radial interference fit and limited connection. Of course, it is not necessary to have an interference fit in the radial direction. In this embodiment, the valve core assembly 12 further includes a first elastic member 124. One end of the first elastic member 124 abuts against the lower end surface of the nut member 122a, and the other end abuts against the guiding part 123, so as to limit the position of the guiding part 123 relative to the supporting protrusion 1211. Of course, in another embodiment, the guiding part 123 can be of an integral structure or a split structure with the valve core body 121. The wall forming the guiding hole 1231 is covered with a guiding coating. The guiding coating is made of wear-resistant material. It should be noted that the sixth embodiment of the present application can be further improved on the basis of the first embodiment of the present application, or can be further improved on the basis of the fifth embodiment of the present application. In addition, the structures of the foregoing embodiments can be combined with each other.

[0038] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although the present specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the technical field can still modify the present invention or make equivalent replacements. All technical solutions and their improvements that do not depart from the spirit and scope of the present invention shall be covered within the scope of the claims of the present invention.

Claims

1. A valve device (1), characterized in that: The valve device (1) comprises a rod component (11) and a valve core assembly (12); the valve core assembly (12) comprises a valve core body (121) and a guide portion (123); the valve core body (121) and the guide portion (123) are integrally structured or fixedly connected or position-limitedly connected; the guide portion (123) has a guide hole (1231); the rod component (11) comprises an extension portion (112); at least a portion of the extension portion (112) is located in the guide hole (1231); the extension portion (112) is guided and matched with the guide portion (123).

2. The valve device (1) according to claim 1, characterized in that The valve device (1) also includes a rotor assembly (13) and a valve seat assembly (15); the rotor assembly (13) is connected to the rod component (11); the rotor assembly (13) can drive the rod component (11) to rotate; the valve seat assembly (15) has a valve port (151); the rod component (11) is transmission-matched with the valve core assembly (12); the rod component (11) can make the valve core assembly (12) move axially relative to the valve port (151); the rod component (11) includes a first matching portion (111); the valve core assembly (12) includes a transmission matching portion (122); the first matching portion (111) and the valve core assembly (12) are transmission-matched via the transmission matching portion (122).

3. The valve device (1) according to claim 1 or 2, characterized in that The extension portion (112) extends along the axial direction of the rod component (11), and the extension portion (112) is located below the first matching portion (111). During the operation of the valve device (1), a portion of the extension portion (112) is always located in the guide hole (1231) and is matched with the wall that forms the guide hole (1231).

4. The valve device (1) according to claim 3, characterized in that The guide hole (1231) is coaxially arranged with the extension portion (112); the guide portion (123) is located at the lower end of the valve core assembly (12); or, the guide portion (123) is located between the first matching portion (111) of the rod component (11) and the lower end of the valve core body (121).

5. The valve device according to claim 3 or 4, characterized in that: The extension portion (112) is clearance-matched or transition-matched with the wall forming the guide hole (1231).

6. The valve device (1) according to any one of claims 3 to 5, characterized in that: The extension part (112) comprises an extension part body (1121) and a guide sleeve (1122), wherein the guide sleeve (1122) is sleeved on the outer periphery of the extension part body (1121); or the extension part (112) comprises an extension part body (1121) and a guide coating, wherein the guide coating covers the outer peripheral surface of the extension part body (1121); the guide sleeve (1122) or the guide coating is made of a wear-resistant material.

7. The valve device (1) according to any one of claims 3 to 6, characterized in that: The guide portion (123) and the valve core body (121) are separate structures, the guide portion (123) and the valve core body (121) are fixedly connected or limit-connected, and the guide portion (123) is made of wear-resistant material; or, the guide portion (123) and the valve core body (121) are an integral structure or a separate structure, the wall forming the guide hole (1231) is covered with a guide coating, and the guide coating is made of wear-resistant material.

8. The valve device (1) according to any one of claims 1 to 7, characterized in that: The valve core assembly (12) has a valve core cavity (125), and part of the extension portion (112) is located in the valve core cavity (125). The valve device (1) also includes a first balancing channel (21), and the valve core cavity (125) is connected to the first balancing channel (21).

9. The valve device (1) according to claim 8, characterized in that At least a portion of the first balancing channel (21) passes through the guide portion (123), at least a portion of the wall forming the first balancing channel (21) is located on the guide portion (123), and the first balancing channel (21) is arranged to deviate from the guide hole (1231).

10. The valve device (1) according to claim 8 or 9, characterized in that The first balancing channel (21) is located in the extension portion (112), and the first balancing channel (21) includes a first opening (211) and a second opening (212). The first opening (211) is connected to the valve core cavity (125), and along the axial direction of the guide portion (123), the second opening (212) is located on one side of the guide portion (123), and the first opening (211) is located on the other side of the guide portion (123).

11. The valve device (1) according to claim 10, characterized in that The first balancing channel (21) comprises an axial channel (214) and a radial channel (213), the axial channel (214) being in communication with the radial channel (213), the first opening (211) being in communication with the radial channel (213), the first opening (211) being located at an outer peripheral portion of the extension portion (112), and the second opening (212) being located at a bottom wall of the extension portion (112); or the first balancing channel (21) comprises an inclined hole, the inclined hole being arranged obliquely relative to an axial direction of the extension portion (112), and the first opening (211) and the second opening (212) being located at two ends of the inclined hole, respectively.

12. The valve device (1) according to any one of claims 8 to 11, characterized in that: The first balancing channel (21) includes a preset gap between the wall forming the guide hole (1231) and the extension portion (112), the wall forming the guide hole (1231) has a groove (21a), and / or the outer peripheral wall of the extension portion (112) has a groove (21a), the groove (21a) constitutes the preset gap of the first balancing channel (21), and the groove (21a) includes a thread groove or a knurled groove.

13. The valve device (1) according to any one of claims 1 to 12, characterized in that The first matching portion (111) includes an external threaded portion (111a), the transmission matching portion (122) includes a nut member (122a), the nut member (122a) has a threaded hole (122a1), the first matching portion (111) can be threadedly matched with the nut member (122a), and the nut member (122a) is fixedly connected or limit-connected to the valve core body (121).

14. The valve device (1) according to claim 13, characterized in that At least a portion of the nut member (122a) is located in the valve core cavity (125); the valve core assembly (12) further comprises a mounting ring (126); the mounting ring (126) is fixedly connected to the valve core body (121); the nut member (122a) is limited by the mounting ring (126) to be located on the valve core body (121); the valve device (1) further comprises a second balancing channel (22); the second balancing channel (22) is connected to the space on the upper and lower sides of the nut member (122a); the second balancing channel (22) comprises a reserved gap between the nut member (122a) and the valve core body (121).

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