Electric valve

Abstract

In the embodiment of the electric valve, the sealing assembly is located between the valve element assembly and the valve seat assembly, the valve element assembly can act relative to the sealing assembly and is in contact sealing arrangement, the valve seat assembly is provided with a valve seat cavity, at least part of the mounting component is located in the valve seat cavity, and the mounting component and the wall forming the valve seat cavity are fixed in an interference fit mode. The sealing assembly is limited between the mounting component and the valve seat assembly in the axial direction of the valve component. By means of the arrangement, installation of the sealing assembly is not affected by welding heat of the valve seat assembly, and the sealing reliability of the sealing assembly can be improved.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, specifically to an electric valve. Background Technology

[0002] In related technologies, electric valves include valve seat assemblies and valve core assemblies. The valve seat assembly has a valve seat portion and a valve port. The valve core assembly can cooperate with the valve port. A sealing assembly is provided between the valve core assembly and the valve seat assembly. The sealing assembly is placed in a groove formed between the two separate valve seat assemblies, and the two valve seat assemblies are then welded together. However, in related technologies, the weld joint of the two separate valve seat assemblies is close to the sealing assembly, which may have an adverse effect on the sealing assembly and lead to a reduction in sealing performance. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve that improves the sealing reliability of the sealing assembly.

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

[0005] An electric valve includes a valve component comprising a valve seat assembly and a valve core assembly. The valve seat assembly has a valve port, and the valve core assembly is capable of engaging with the valve port. The valve component further includes a mounting component and a sealing component. The sealing component is located between the valve core assembly and the valve seat assembly. The valve core assembly is operable relative to the sealing component and contacts a sealing setting. The valve seat assembly has a valve seat cavity, and at least a portion of the mounting component is located in the valve seat cavity. The mounting component is interference-fitted with a wall forming the valve seat cavity. Along the axial direction of the valve component, the sealing component is confined between the mounting component and the valve seat assembly.

[0006] In the embodiments of the electric valve provided in this application, the sealing assembly is located between the valve core assembly and the valve seat assembly. The valve core assembly is capable of moving relative to the sealing assembly and contacting the sealing device. The valve seat assembly has a valve seat cavity, and at least a portion of the mounting component is located in the valve seat cavity. The mounting component is fixed to the wall forming the valve seat cavity by an interference fit. Along the axial direction of the valve component, the sealing assembly is confined between the mounting component and the valve seat assembly. This configuration eliminates the need for welding and assembling the valve seat assembly after the sealing assembly is installed. The sealing assembly is unaffected by the welding heat of the valve seat assembly, which helps to improve the sealing reliability of the sealing assembly. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of one embodiment of the valve component provided in this application;

[0008] Figure 2 yes Figure 1 A front view structural diagram of the central valve component;

[0009] Figure 3 yes Figure 2 A cross-sectional view of the central valve component along plane AA;

[0010] Figure 4 yes Figure 2 A cross-sectional view of the central valve component from another perspective;

[0011] Figure 5 This is a three-dimensional structural diagram of one embodiment of the mounting component;

[0012] Figure 6 yes Figure 5 A front view structural diagram of the component being installed in the middle;

[0013] Figure 7 yes Figure 6 A cross-sectional view of the mounting components along the BB plane;

[0014] Figure 8 This is a cross-sectional structural schematic diagram of another embodiment of the valve component. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0016] In the embodiments of this application, the electric valve includes an electronic expansion valve, which can be applied to refrigerant systems such as commercial, residential or vehicle thermal management systems or other systems that require heat management, such as battery thermal management, thermal management of electrical components, etc. The electric valve can regulate the refrigerant flow in the system and can also function as a switch valve.

[0017] Combination Figure 1-4 In this embodiment, the electric valve includes a valve body (not shown in the figure), a valve component 100, and a coil assembly (not shown in the figure). The valve component 100 is fixedly connected to or limited by the valve body, and the coil assembly is fixedly connected to or limited by the valve body. In this embodiment, the valve component 100 is threadedly connected to the valve body; of course, it can also be fixed or limited by snap-fit ​​or other methods. The coil assembly can be fixedly connected to or limited by the valve body by screws, snap-fit, or other methods. The valve body has a valve body cavity, and at least a portion of the valve component 100 is located in the valve body cavity. In other embodiments, the coil assembly can be fixedly connected to the valve component 100, and after the two are fixedly connected, it is then fixedly connected to or limited by the valve body. In this embodiment, the valve body is a separate valve block; in other embodiments, the valve body can also be part of a system, such as part of a heat exchanger or an integrated component flow channel plate.

[0018] Combination Figure 1-4The valve component 100 includes a valve seat assembly 1 and a valve core assembly 2. The valve seat assembly 1 has a valve port 111, and the valve core assembly 2 can cooperate with the valve port 111 to regulate the flow rate of refrigerant flowing through the valve port 111. The valve component 100 also includes a nut assembly 31, a sleeve 32, and a rotor assembly 33. The sleeve 32 is fixedly connected to the valve seat assembly 1. The coil assembly includes a stator assembly (not shown in the figure), which is located outside the sleeve 32, and the rotor assembly 33 is located inside the sleeve 32. The valve core assembly 2 is connected to the rotor assembly 33. When a predetermined current is applied to the stator assembly, an excitation magnetic field is generated, which drives the rotor assembly 33 to rotate. The rotor assembly 33 drives the valve core assembly 2 to rotate. The valve core assembly 2 is threadedly engaged with the nut assembly 31, converting the rotation of the rotor assembly 33 into axial movement of the valve core assembly 2 relative to the valve seat assembly 1. The valve core assembly 2 cooperates with the valve port 111 to adjust the flow area of ​​the valve port 111, or in other words, to adjust the opening degree of the valve port 111, thereby realizing the flow regulation of the refrigerant in the system. Of course, the axial movement of the valve core assembly 2 relative to the valve seat 1 can also be achieved by means of transmission such as planetary gears and bearings.

[0019] Combination Figure 3-7 In this embodiment, the valve component 100 includes the aforementioned valve seat assembly 1 and the aforementioned valve core assembly 2. The valve seat assembly 1 has the aforementioned valve port 111, and the valve core assembly 2 can cooperate with the valve port 111. The valve component 100 also includes a mounting component 4 and a sealing component 5. The sealing component 5 is located between the valve core assembly 2 and the valve seat assembly 1, and the valve core assembly 2 can move relative to the sealing component 5 and contact the sealing setting. The valve seat assembly 1 has a valve seat cavity 12, and at least part of the mounting component 4 is located in the valve seat cavity 12. The mounting component 4 is fixed to the wall forming the valve seat cavity 12 by an interference fit. Along the axial direction of the valve component 100, the sealing component 5 is limited to being located between the mounting component 4 and the valve seat assembly 1. With this configuration, it is not necessary to weld and assemble the valve seat assembly after the sealing component 5 is installed. The sealing component 5 is not affected by the welding heat of the valve seat assembly 1, which can avoid adverse consequences such as deformation caused by the welding heat of the sealing component 5, thus affecting the sealing reliability. By setting the installation component 4 to limit the sealing component 5, it is also beneficial to simplify the installation difficulty of the sealing component 5 and improve the flexibility of the installation of the sealing component 5.

[0020] Combination Figure 3-4In this embodiment, the valve core assembly 2 includes a valve core portion 21 and a lead screw portion 22. The valve core portion 21 and the lead screw portion 22 are connected in a transmission manner. The lead screw portion 22 can drive the valve core portion 21 to move axially up and down relative to the valve seat assembly 1. The valve core assembly 2 has a first balance hole 211, which is located on the central axis of the valve core portion 21. The valve seat assembly 1 includes a receiving portion with a receiving groove 13. The sealing assembly 5 is located in the receiving groove 13. In this embodiment, the receiving groove 13 is generally annular and has an inward and upward opening. The inward opening is located towards the valve core portion 21 of the valve core assembly 2 along the radial direction of the valve component 100. The lower end of the mounting component 4 blocks the upward opening of the receiving groove 13, restricting the upper displacement of the sealing assembly 5. By blocking the upward opening of the receiving groove 13 at the lower end of the mounting component 14, the upper displacement of the sealing assembly 5 is restricted. With this setting, the installation and mating structure and installation sequence of the sealing assembly 5 can be more flexible and are not affected by whether the valve seat assembly 1 is a split structure or whether welding is required at the split connection.

[0021] Combination Figure 3-4 In this embodiment, the sealing assembly 5 includes a first sealing ring 51 and a first annular member 52. The first sealing ring 51 is made of rubber material and has greater elasticity than the first annular member 52; for example, it can be an O-ring. The first sealing ring 51 is pressed between the inner peripheral wall of the receiving groove 13 and the first annular member 52. The first sealing ring 51 can undergo a certain amount of shrinkage deformation, thereby ensuring that the inner peripheral wall of the first annular member 52 is in close contact with the outer peripheral wall of the valve core 21. The first annular member 52 is made of resin material, such as PEEK (polyether ether ketone) or PPS (polyphenylene sulfide). The inner peripheral wall of the first annular member 52 contacts and seals with the valve core 21. The resin material of the first annular member 52 helps to reduce the friction between the valve core 21 and the first annular member 52. In this embodiment, the combination of the first sealing ring 51 and the first annular member 52 can improve the sealing performance and minimize the friction between the valve core 21 and the sealing assembly 5. Furthermore, in this embodiment, the sealing component 5 is first placed in the receiving groove 13 of the valve seat component 1, and then the upper displacement of the sealing component 5 is restricted by the mounting component 4. This can prevent the first annular part 52 made of resin material from deforming during installation and being unable to recover, thus affecting the sealing performance of the sealing component 5.

[0022] Combination Figure 3-7In this embodiment, the mounting component 4 is generally cylindrical, comprising an upper cylindrical portion 41 and a lower cylindrical portion 42. The lower cylindrical portion 42 is closer to the valve port 111 than the upper cylindrical portion 41. The lower end face of the lower cylindrical portion 42 blocks the upward-facing opening of the receiving groove 13, restricting the upper displacement of the sealing assembly 5. In this embodiment, the mounting component 4 is made of resin material, such as PEEK (polyether ether ketone) or PPS (polyphenylene sulfide), which helps to reduce the weight of the mounting component 4, thereby reducing the weight of the valve assembly 100. The outer peripheral wall of the upper cylindrical portion 41 is press-fitted with the inner peripheral wall of the valve seat cavity 12 forming the valve seat assembly 1, thereby fixing the mounting component 4 to the valve seat assembly 1. This arrangement simplifies the installation of the mounting component 4, making its installation easier. In this embodiment, the valve seat assembly 1 includes a limiting surface 14, and the aforementioned receiving groove 13 is recessed from the limiting surface 14. A portion of the lower end face of the lower cylindrical portion 42 abuts against the limiting surface 14, thereby limiting the position of the mounting component 4 relative to the lowest end of the valve seat assembly during installation. In this embodiment, the outer diameter of the lower cylindrical portion 42 is smaller than the outer diameter of the upper cylindrical portion 41. This design helps to further reduce the material used in the mounting component 4 and lighten its weight. In another embodiment, the mounting component 4 is made of aluminum, which also helps to reduce its weight. The mounting component 4 can also be press-fitted to the valve seat assembly 1 by an interference fit, simplifying the installation of the mounting component 4. In other embodiments, the mounting component 4 can also be made of stainless steel, brass, or other materials. In this case, the mounting component 4 can be press-fitted to the valve seat assembly 1 by an interference fit or fixed by welding or other methods.

[0023] In this embodiment, a portion of the inner peripheral wall of the lower cylindrical portion 42 is guided and engaged with the valve core assembly 2. Specifically, at least a portion of the valve core 21 is located within the internal space of the mounting portion. The inner peripheral wall of the lower cylindrical portion 42 has an inner guide wall 421, and a portion of the outer peripheral portion of the valve core 21 is guided and engaged with the inner guide wall 421. This guided engagement means that the lower cylindrical portion 42 can provide guidance for the axial movement of the valve core 21. This guided engagement includes contact or small clearance engagement. This arrangement is beneficial for improving the coaxiality of the valve core assembly 2. In this embodiment, the mounting component 4 is made of resin material, which is beneficial for improving the lubrication performance of the inner guide wall 421 of the lower cylindrical portion and is more conducive to providing sliding guidance for the axial movement of the valve core 21. In this embodiment, the outer diameter of the portion of the valve core 21 that contacts the inner guide wall 421 is larger than the outer diameter of the portion of the valve core 21 that contacts the sealing assembly 5. This arrangement can avoid affecting the sealing performance of the sealing assembly 5.

[0024] Combination Figure 3-4In this embodiment, the nut assembly 31 includes an internal thread portion 311 and a nut guide portion 312. The internal thread portion 311 can be threadedly engaged with the lead screw portion 22. The nut guide portion 312 is generally cylindrical and is guidedly engaged with the inner circumferential wall of the upper cylindrical portion 41. In this embodiment, the nut guide portion 312 is press-fitted into the upper cylindrical portion 41. This press-fitting includes interference fit. The guiding fit refers to providing guidance for the nut guide portion 312 during the interference fit process. The guiding fit includes transition, interference, or small clearance fit. This arrangement helps to improve the coaxiality of the nut assembly 31. Of course, in other embodiments, the nut guide portion 312 can also be transitionally or clearance-fitted with the upper cylindrical portion 41. The installation of the nut guide portion 312 on the upper cylindrical portion 41 can also improve the guidance and improve the overall coaxiality of the nut assembly 31. In this embodiment, the installation component 4 can simultaneously improve the coaxiality of the valve core assembly 2 and the nut assembly 31, thereby improving the overall coaxiality of the valve component 100, which is beneficial to improving the control accuracy of the electric valve.

[0025] Combination Figure 3-7In this embodiment, at least a portion of the valve core 21 is located within the internal space of the mounting component 4. The first balance hole 211 is located on the central axis of the valve core 21 and has an opening at the lower end of the valve core. The valve core 21 also includes a second balance hole 212, which has an opening on the outer peripheral wall of the valve core 21 and is located on the upper side of the sealing assembly 5. The number of second balance holes 212 can be several. The second balance holes 212 connect the first balance hole 211 with the inner space of the mounting component 4. In this embodiment, the processing of the first balance hole 211 and the second balance hole 212 is relatively simple and convenient. In this embodiment, the lower cylindrical portion 42 has a third balance hole 422, which penetrates the lower cylindrical portion 42 along the radial direction of the electric valve. The third balance hole 422 connects the inner space and the outer space of the mounting component 4. The processing of the third balance hole 422 is also relatively simple and convenient. The outer diameter of the lower cylindrical portion 42 is smaller than the outer diameter of the upper cylindrical portion 41; the valve component 100 also includes a fourth balancing hole 411; the fourth balancing hole 411 extends through the upper cylindrical portion 41 along the axial direction of the valve component 100; or, the outer peripheral wall of the upper cylindrical portion 41 and / or the inner wall of the valve seat assembly 1 have a groove, which forms the fourth balancing hole 411; the fourth balancing hole 411 connects the outer space of the lower cylindrical portion 42 and the upper space of the upper cylindrical portion 41. In this embodiment, an embodiment in which the outer peripheral wall of the upper cylindrical portion 41 has a groove forming the fourth balancing hole 411 is shown schematically. By providing a groove in the upper cylindrical portion 41 as the fourth balancing hole 411, it is beneficial to reduce the processing difficulty of the fourth balancing hole 411. The first balance hole 211, the second balance hole 212, the third balance hole 422, and the fourth balance hole 411 together form part of the balance channel. This helps to balance the pressure in the channel or space below the valve port 111 and the cavity where the rotor is located when the valve core 21 closes the valve port 111, thereby reducing the opening driving force of the electric valve and thus reducing the cost of the electric valve. In this embodiment, the nut assembly 31 has a nut connecting plate 313, which is welded and fixed to the valve seat assembly 1, thereby fixing the nut assembly 31 to the valve seat assembly 1. The nut connecting plate 313 is provided with a connecting channel (not shown in the figure), which, as part of the balance channel, connects the upper and lower spaces of the nut connecting plate 313.

[0026] Combination Figure 3-4In this embodiment, the valve seat assembly 1 includes a connecting sleeve 15, an upper valve seat portion 16, and a lower valve seat portion 17. The valve component 100 also includes the aforementioned sleeve 32. Both the sleeve 32 and the connecting sleeve 15 are made of stainless steel. The sleeve 32 and the connecting sleeve 15 are welded together. Specifically, in this embodiment, the sleeve 32 and the connecting sleeve 15 are fixed by laser welding, which is a relatively simple fixing method. In other embodiments, they can also be fixed by brazing or other methods. In this embodiment, the connecting sleeve 15 is annular, and the upper valve seat portion 16 has a mounting groove 161. The mounting groove 161 is annular, and at least a portion of the connecting sleeve 15 is located in the mounting groove 161, which limits the positioning of the connecting sleeve 15. In this embodiment, the connecting sleeve 15 is welded to the upper valve seat portion 16. Specifically, in this embodiment, the upper valve seat portion 16 is made of aluminum. The upper valve seat portion 16 and the connecting sleeve 15 are welded together by high-frequency induction welding. After welding, the solder overflows into the gap between the connecting sleeve 15 and the upper valve seat portion 16, thereby firmly fixing the two together and sealing them with the annular weld formed by welding. In other embodiments, it can also be fixed by brazing or other methods. In this embodiment, the upper valve seat portion 16 is made of aluminum, which helps to reduce the weight of the upper valve seat portion 16, thereby reducing the overall weight of the valve component 100. Of course, in other embodiments, the upper valve seat can be made of stainless steel or other materials.

[0027] Combination Figure 3-4 In this embodiment, the valve seat assembly 1 includes the aforementioned lower valve seat portion 17, which is separately formed from the upper valve seat portion 16 and fixedly connected. In this embodiment, the lower valve seat portion 17 is made of stainless steel, and the valve port 111 is located on the lower valve seat portion 17. The lower valve seat portion 17 and the upper valve seat portion 16 are fixedly connected by riveting or interference fit, which simplifies the connection process. The valve port 111 is integrally formed from the stainless steel lower valve seat portion 17, which ensures the wear resistance of the valve port 111 and improves the service life of the valve component 100.

[0028] refer to Figure 8 In another embodiment of this invention, the lower valve seat portion 17 is made of aluminum, and the upper valve seat portion 16 is integrally formed with the lower valve seat portion 17. This arrangement also helps to reduce the weight of the valve seat assembly 1. In this embodiment, the valve seat assembly 1 also includes a valve port portion 11, with a valve port 111 located in the valve port portion 11. The valve port portion 11 and the lower valve seat portion 17 are separately formed, and the valve port portion 11 is made of stainless steel, which helps to improve the wear resistance of the valve port 111. In this embodiment, the valve port portion 11 and the lower valve seat portion 17 are fixedly connected by riveting. In other embodiments, they can be fixedly connected by interference fit or other methods. Of course, the upper valve seat portion 16 and the lower valve seat portion 17 can also be separately formed and fixedly connected by riveting or interference fit, which also helps to reduce the weight of the valve seat assembly 1.

[0029] In other embodiments, the upper valve seat portion 16 and the lower valve seat portion 17 of the valve seat assembly 1 can both be made of stainless steel. In this case, the upper valve seat portion 16 and the lower valve seat portion 17 are integrally formed structures, or they can be separate structures and are fixedly connected by welding or other methods.

[0030] 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 the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An electric valve, characterized in that, The valve assembly (100) includes a valve seat assembly (1) and a valve core assembly (2). The valve seat assembly (1) has a valve port (111). The valve core assembly (2) is capable of engaging with the valve port (111). The valve assembly (100) also includes a mounting component (4) and a sealing component (5). The sealing component (5) is located between the valve core assembly (2) and the valve seat assembly (1). The valve core assembly (2) is capable of moving relative to the sealing component (5) and contacting the sealing setting. The valve seat assembly (1) has a valve seat cavity (12). At least a portion of the mounting component (4) is located in the valve seat cavity (12). The mounting component (4) is interference-fitted with the wall forming the valve seat cavity (12) along the axial direction of the valve assembly (100). The sealing component (5) is limited to being located between the mounting component (4) and the valve seat assembly (1).

2. The electric valve according to claim 1, characterized in that, The valve seat assembly (1) includes a receiving portion having a receiving groove (13), the sealing assembly (5) is located in the receiving groove (13), the receiving groove (13) has an inward and upward opening, and the lower end of the mounting member (4) blocks the upward opening of the receiving groove (13) to restrict the upper displacement of the sealing assembly (5).

3. The electric valve according to claim 1 or 2, characterized in that, The sealing assembly (5) includes a first sealing ring (51) and a first annular member (52). The first sealing ring (51) is made of rubber material and is pressed between the inner peripheral wall of the receiving groove (13) and the first annular member (52). The first annular member (52) is made of resin material and has a sealing fit with the valve core assembly (2).

4. The electric valve according to any one of claims 1-3, characterized in that, The mounting component (4) is generally cylindrical and includes an upper cylindrical part (41) and a lower cylindrical part (42). The lower end face of the lower cylindrical part (42) blocks the upward opening of the receiving groove (13). The outer peripheral wall of the upper cylindrical part (41) is press-fitted with the inner peripheral wall forming the valve seat assembly (1). The mounting component (4) is made of resin material or metal material.

5. The electric valve according to claim 4, characterized in that, Part of the inner peripheral wall of the lower cylindrical portion (42) is guided and engaged with the valve core assembly (2). The valve component (100) also includes a nut assembly (31). The valve core assembly (2) includes a valve core portion (21) and a lead screw portion (22). The lead screw portion (22) is threadedly engaged with the nut assembly (31). The nut assembly (31) also includes a nut guide portion (312). The nut guide portion (312) is guided and engaged with the inner peripheral wall of the upper cylindrical portion (41).

6. The electric valve according to claim 4 or 5, characterized in that, The valve core assembly (2) includes a valve core portion (21), at least a portion of which is located within the interior space of the mounting component (4). The valve core assembly (2) has a first balancing hole (211) located on the central axis of the valve core portion (21). The valve core portion (21) also includes a second balancing hole (212), which has an opening on the outer peripheral wall of the valve core portion (21) and connects the first balancing hole (211) with the interior space of the mounting component (4).

7. The electric valve according to claim 6, characterized in that, The lower cylindrical portion (42) has a third balancing hole (422), which penetrates the lower cylindrical portion (42) along the radial direction of the valve component (100) and connects the inner space and the outer space of the mounting component (4).

8. The electric valve according to claim 7, characterized in that, The outer diameter of the lower cylindrical portion (42) is smaller than the outer diameter of the upper cylindrical portion (41); the valve component (100) further includes a fourth balancing hole (411); the fourth balancing hole (411) penetrates the upper cylindrical portion (41) along the axial direction of the valve component (100); or, the outer peripheral wall of the upper cylindrical portion (41) and / or the inner wall of the valve seat assembly (1) have a groove, which forms the fourth balancing hole (411); the fourth balancing hole (411) connects the outer space of the lower cylindrical portion (42) and the upper space of the upper cylindrical portion (41).

9. The electric valve according to claims 1-8, characterized in that, The valve seat assembly (1) includes a connecting sleeve (15) and an upper valve seat portion (16). The valve component (100) also includes a sleeve (32). The sleeve (32) and the connecting sleeve (15) are both made of stainless steel. The sleeve (32) is welded and fixed to the connecting sleeve (15). The connecting sleeve (15) is welded and fixed to the upper valve seat portion (16).

10. The electric valve according to claim 9, characterized in that, The upper valve seat (16) is made of aluminum material, and the upper valve seat (16) and the connecting sleeve (15) are fixed by high frequency induction welding; the upper valve seat (16) has a mounting groove (161), and at least part of the connecting sleeve (15) is located in the mounting groove (161).

11. The electric valve according to claim 10, characterized in that, The valve seat assembly (1) also includes a lower valve seat portion (17); The lower valve seat (17) is made of stainless steel. The upper valve seat (16) and the lower valve seat (17) are separately formed and fixedly connected. The lower valve seat (17) is an integral structure. The valve port (111) is located in the lower valve seat (17). The lower valve seat (17) is made of aluminum. The upper valve seat (16) and the lower valve seat (17) are integrally formed or separately formed. The valve seat assembly (1) also includes a valve port (11). The valve port (111) is located in the valve port (11). The valve port (11) is made of stainless steel. The valve port (11) is fixedly connected to the lower valve seat (17).

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