Valve device

Abstract

The valve device comprises a valve body, a valve seat and a valve element, the valve body is fixed to the valve seat, the valve device is provided with a valve port, the valve element can block or open the valve port, the valve device is provided with an inlet part, the inlet part and the valve seat are fixed or integrally formed, and the inlet part is provided with an inner channel; the inner channel deviates from the valve element in the axial direction of the inner channel, or the inlet part is provided with a body part and a guide piece, the guide piece is connected to the outlet end of the body part, and the outlet end of the body part is opposite to the valve element in the axial direction of the inner channel of the body part; the extending direction of the guide piece intersects with the axial direction of the inner channel. According to the valve device, the front impact force of fluid on the valve element can be reduced, then the displacement deviation generated when the valve element is subjected to the fluid is reduced, and the risk of leakage in the valve closing state of the valve device is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to a valve device. Background Art

[0002] Valve devices are widely used in production and life. They are devices that use a movable part to open, close or partially block one or more openings or channels so that liquid flow, air flow or other fluids or loose materials can flow out or be regulated.

[0003] In an existing valve device, after the fluid flows into the valve device through the inlet pipe, it exerts a large positive impact force on the valve core, which easily causes the valve core to shift in position, resulting in the risk of leakage when the valve device is in the closed state. Summary of the invention

[0004] The purpose of the present invention is to at least solve the problems in the background technology and to provide a valve device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The technical solution discloses a valve device, comprising a valve body, a valve seat, and a valve core, wherein the valve body is fixed to the valve seat, at least a portion of the valve core is located on the valve body, the valve device has a valve port, the valve core can block or open the valve port, the valve device has an inlet portion, the inlet portion is fixed to or integrally formed with the valve seat, and the inlet portion has an inner channel;

[0007] Along the axial extension direction of the inner channel, the inner channel deviates from the valve core, or the inlet portion has a main body and a guide member, the guide member is connected to the outlet end of the main body, the inner channel includes a main body channel located in the main body, along the axial extension direction of the main body channel, the outlet end of the main body is opposite to the valve core, and the extension direction of the guide member intersects with the axial extension direction of the main body channel.

[0008] In the valve device of the above technical solution, along the axial extension direction of the inner channel, the inner channel deviates from the valve core, thereby reducing the frontal impact force of the fluid medium on the valve core, and further reducing the displacement deviation of the valve core caused by the impact of the fluid medium, reducing the risk of leakage in the valve device when the valve is in the closed state; or along the axial extension direction of the main body channel, the outlet end of the main body is opposite to the valve core, and the extension direction of the guide member intersects with the axial extension direction of the main body channel. The guide member guides the flow direction of the fluid medium, reduces the frontal impact force of the fluid on the valve core, and further reduces the displacement deviation of the valve core caused by the fluid, reducing the risk of leakage in the valve device when the valve is in the closed state.

[0009] The features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0011] Figure 1 is a schematic structural diagram of a valve device according to an embodiment;

[0012] Figure 2 is a schematic cross-sectional structure diagram of a valve device according to an embodiment;

[0013] Figure 3 is a schematic cross-sectional structural diagram of a valve device in another embodiment;

[0014] Figure 4 is a schematic cross-sectional structural diagram of a valve device in another embodiment;

[0015] Figure 5 is a schematic diagram of a cross-sectional structure of a valve seat according to an embodiment;

[0016] Figure 6 A schematic structural diagram of a valve sleeve according to an embodiment;

[0017] Figure 7 A schematic diagram showing a cross-sectional structure in which the inlet portion deviates from the valve core in an embodiment;

[0018] Figure 8 A top view showing an embodiment in which the inlet portion deviates from the valve core;

[0019] Fig. 9 A top view showing an alternative embodiment in which the inlet portion deviates from the valve core.

[0020] Reference numerals:

[0021] 1. Valve body, 2. Valve seat, 21. Accommodating cavity, 22. Mounting port, 23. Valve port, 3. Valve core, 4. Inlet portion, 40. Main body portion, 401. Main body channel, 41. Outlet end portion, 42. Inner channel, 5. Guide member, 51. Guide plate, 52. Guide tube, 6. Valve sleeve, 61. Annular groove, 62. First side portion, 621. Retaining portion, 622. Through hole, 63. Second side portion, 64. Mounting portion, 65. Sleeve portion, 7. Step portion, 8. Groove. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Other embodiments obtained by technical personnel in the field without creative work all belong to the protection scope of the present invention. In addition, it should be understood that the following words indicating orientation or position relationship such as "up", "down", "left", "right", "high", "low", "longitudinal", "lateral", "inside", "outside", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0023] like Figure 1-Figure 6 As shown, a valve device of this embodiment comprises a valve body 1, a valve seat 2 and a valve core 3, wherein the valve body 1 is fixed to the valve seat 2, and at least a part of the valve core 3 is located in the valve body 1. The valve device has a valve port 23, and the valve core 3 can block or open the valve port 23. The valve device has an inlet portion 4, which is fixed to or integrally formed with the valve seat 2, and the inlet portion 4 has an inner channel 42; the inlet portion 4 has a main body portion 40 and a guide member 5, and the guide member 5 is connected to an outlet end portion 41 of the main body portion 40, and the inner channel 42 includes a main body portion channel 401 located in the main body portion 40, and along the axial extension direction of the main body portion channel 401, the outlet end portion 41 of the main body portion 40 is opposite to the valve core 3, and the outlet end portion 41 of the main body portion 40 intersects with the axial extension direction of the main body portion channel 401.

[0024] It can be understood that the intersection of the outlet end 41 and the axial extension direction of the main body channel 401 means that the guide member 5 does not continue to extend along the axial direction of the outlet end 41, and the outlet end 41 is opposite to the valve core 3, which means that the center line of the outlet end 41 passes through the valve core 3, or the projection of the valve core 3 on the outlet surface corresponding to the outlet end 41 is basically located at the center of the outlet surface. In this embodiment, the flow direction of the fluid medium is changed by the guide member 5, and the fluid medium is guided to flow away from the valve core 3, thereby reducing the frontal impact force of the fluid medium on the valve core 3, thereby reducing the displacement deviation of the valve core 3 caused by the fluid, and reducing the risk of leakage when the valve device is in the closed state.

[0025] In one embodiment, the valve seat 2 is cylindrical, the valve core 3 is located at the central axis of the cylindrical valve seat 2, the body 40 is cylindrical, the body 40 is connected to the side wall of the valve seat 2, and the outlet end 41 of the body 40 is directly opposite to the valve core 3, that is, directly opposite to the valve seat 2, thereby facilitating the connection between the body 40 and the side wall of the valve seat 2. The body 40 can be fixedly connected to the side wall of the valve seat 2 by welding or integral molding. Of course, in other embodiments, the valve seat 2 can also adopt other shapes such as square.

[0026] In one embodiment, the body 40 is a circular tubular inlet pipe or an interface of other shapes such as a rectangle. The inlet component of the valve device may also have a multi-section structure, in which case the section directly connected to the valve seat should be considered as the body 40. The body 40 is preferably a pipe-shaped structure having a body channel 401 of regular shape.

[0027] In one embodiment, Figure 2 As shown, the guide member 5 includes a guide plate 51, which is connected to the outlet end 41 and is inclined toward the main body channel 401. The guide plate 51 can be fixed to the outlet end 41 by welding or screwing or integrally formed, and the guide plate 51 is in the form of a plate. The guide plate 51 and the outlet end 41 are arranged obliquely, that is, the guide plate 51 is not arranged along the extension direction of the pipeline wall of the outlet end 41, but as a baffle, the guide plate 51 changes the flow direction of the fluid medium so that the flow direction of the fluid medium is not directly opposite to the valve core 3. After the fluid medium flows out through the guide plate 51, the front impact force of the fluid medium on the valve core 3 is reduced.

[0028] In one embodiment, Figure 3 As shown, the guide plate 51 is bent toward the main body channel 401 . The bent guide plate 51 can achieve a larger angle change in the flow path of the fluid medium within a shorter distance, and can also maintain smooth fluidity of the fluid medium and reduce the impact force of the fluid medium on the guide plate 51 .

[0029] The guide plate 51 can be arranged at the side end of the outlet end 41, or at the upper end or the lower end of the outlet end 41. When the guide plate 51 is arranged at the side end of the outlet end 41, the center line of the flow channel formed by the guide plate 51 and the outlet end 41 deviates from the valve core 3; when the guide plate 51 is arranged at the upper end or the lower end of the outlet end 41, the valve core 3 is still located at the center line of the flow channel formed by the guide plate 51 and the outlet end 41, but at this time, the center line of the flow channel formed by the guide plate 51 and the outlet end 41 is inclined upward or downward, and is not perpendicular to the valve core, so that the impact force on the valve core is also smaller than the impact force generated by the fluid medium flowing out of the outlet end 41 on the valve core 3 when it is arranged opposite to the valve core 3. Of course, the guide plate 51 can also be arranged at the upper side end or the lower side end of the outlet end 41, both of which can reduce the impact force of the fluid medium on the valve core 3.

[0030] In one embodiment, the extension line of the guide plate 51 separates the valve core 3 and the outlet end 41 on both sides thereof. After the fluid medium flows through the guide plate 51, it diffuses and flows around before impacting the valve core 3. At this time, the impact force is much smaller than the impact force generated by the fluid medium flowing out of the outlet end 41 arranged opposite to the valve core 3 on the valve core 3, thereby reducing the positional deviation of the valve core 3 caused by the fluid medium, and reducing the risk of leakage when closing the valve. Of course, in other embodiments, the valve core 3 and the outlet end 41 can also be located on the same side of the extension line of the guide plate 51, but at this time, the center line of the flow channel formed by the guide plate 51 and the outlet end 41 still deviates from the valve core 3. In the direction of the extension section of the flow channel, after the fluid medium flows out of the flow channel, the fluid medium at the periphery will first disperse and flow around. At this time, the flow velocity of the fluid medium at the periphery is reduced, while the flow velocity of the fluid medium at the center is still higher, so that the center line of the flow channel formed by the guide plate 51 and the outlet end 41 deviates from the valve core 3, which can also reduce the impact force of the fluid medium on the valve core 3.

[0031] In one embodiment, Figure 4 As shown, the guide member 5 includes a guide tube 52 , which is connected to the outlet end 41 , and the center line of the guide tube 52 intersects with the center line of the main body channel 401 .

[0032] In one embodiment, the guide tube 52 is welded and fixed to the body 40. The guide tube 52 makes the fluid medium flow more smoothly. The diameter of the guide tube 52 is smaller than the diameter of the installation opening 22 of the valve seat. Further, in the axial extension direction of the body channel 401, the projection of the guide tube 52 is located within the projection area of ​​the body 40, thereby facilitating the body 40 connected with the guide tube 52 to be inserted into the installation opening 22. During installation, the guide tube 52 is inserted into the accommodating cavity 21 of the valve seat 2 through the installation opening 22, and then a portion of the body 40 is inserted into the installation opening 22 and welded to the valve seat 2. In other embodiments, the guide tube 52 may also be integrally formed with the body 40.

[0033] Further, part of the guide tube 52 is directly connected to the body 40, and the guide tube 52 is connected to the body 40 through a connector, one end of the connector is fixed to the inner wall of the body 40, and the other end faces the body channel 401. The inner diameter of the guide tube 52 can be made smaller than the inner diameter of the body 40 through the connector, so that the guide tube 52 can be easily installed in the installation port 22. Of course, in other embodiments, all parts of the guide tube 52 are connected to the body 40 through the connector. The connector can be welded or integrally formed at the end of the inlet portion.

[0034] Specifically, with the center line of the main body 40 as a reference, the guide tube 52 may deviate from the center line of the main body 40 to the left, to the right, to the upper side, or to the lower side. Figure 4In one embodiment shown, the guide tube 52 deviates downward from the center line of the main body 40, so that the fluid medium produces an oblique impact on the valve core, which has a smaller impact on the valve core than a vertical impact from the front. In other embodiments, the guide tube 52 can also deviate to the left or right from the center line of the main body 40, and most of the fluid medium flows from the front side to the space between the valve core 3 and the inner wall of the valve seat 2, thereby reducing the impact force of the fluid medium on the valve core 3.

[0035] In one embodiment, along the axial extension direction of the inner channel 42, the inner channel 42 deviates from the valve core 3. It can be understood that the inner channel 42 deviates from the valve core 3, which means that the center line of the inner channel 42 does not intersect with the valve core 3, or the center line of the inner channel 42 intersects with the valve core 3 but the two are not perpendicular. In this case, the setting of the guide member 5 can be cancelled.

[0036] In one embodiment, Figure 7 , Figure 8 As shown, the inner channel 42 is perpendicular to the front of the valve seat 2, but the center line of the inner channel 42 does not intersect with the valve core 3, that is, the inner channel 42 deviates from the valve core 3. At this time, the center line of the inner channel 42 faces the space area between the valve core 3 and the valve seat 2, and most of the fluid medium faces the space area between the valve core 3 and the valve seat 2, thereby reducing the impact force of the fluid medium on the valve core 3, thereby reducing the position deviation of the valve core 3 and reducing the probability of leakage when closing the valve; on the other hand, the center line of the main body 40 does not intersect with the valve core 3. After the fluid medium flows out of the main body 40, part of the fluid close to the outside will diffuse and flow toward the circumference, and the flow rate will decrease, while the flow rate of part of the fluid close to the center is still fast. Therefore, the impact of part of the fluid medium close to the outside directly impacting the valve core 3 on the valve core 3 is small, which is significantly smaller than the impact on the valve core 3 when the main body 40 is facing the valve core 3 (that is, the center line of the main body 40 intersects with the valve core 3).

[0037] In one embodiment, in the axial extension direction of the inner channel 42, the projection of the valve core 3 is located outside the projection of the main body 40, that is, the valve core 3 is located outside the area enclosed by the extension line of the main body 40. At this time, the entire front side of the main body 40 faces the space between the valve core 3 and the inner wall of the valve seat 2 or faces the inner wall of the valve seat 2. The fluid medium flows to the space between the valve core 3 and the inner wall of the valve seat 2 or flows toward the inner wall of the valve seat 2. Only the fluid that diffuses and flows toward the circumferential side during the flow process will impact the valve core 3. At this time, the impact force is much smaller than the impact force generated by the fluid medium flowing out of the inner channel 42 relative to the valve core 3 on the valve core 3, thereby reducing the position offset of the valve core 3 caused by the influence of the fluid and reducing the risk of leakage when the valve is closed.

[0038] In one embodiment, Fig. 9As shown, the front surfaces of the main body 40 and the valve seat 2 are inclined, and most or all of the main body 40 faces the space area between the valve core 3 and the valve seat 2, thereby reducing the front impact of the fluid medium on the valve core 3.

[0039] In one embodiment, the accommodating cavity 21 of the valve seat 2 is communicated with the inner channel 42 and the valve port 23 respectively, and at least a portion of the guide member 5 is located in the accommodating cavity 21 of the valve seat 2 .

[0040] In one embodiment, Figure 2-Figure 4 , Figure 6 , Figure 7 As shown, the valve device includes a valve sleeve 6, which is sleeved on a portion of the outer periphery of the valve core 3, and the valve sleeve 6 is fixed to the valve seat 2. The valve sleeve 6 is sleeved on a portion of the outer periphery of the valve core 3, and the valve sleeve 6 is more impact-resistant than the valve core. On the one hand, the valve sleeve 6 can block the frontal impact of part of the fluid medium on the valve core 3, and on the other hand, it can limit the valve core 3, thereby further reducing the position deviation of the valve core 3 and reducing the probability of leakage when the valve is closed.

[0041] Specifically, the upper end of the valve sleeve 6 can be fixed to the upper end of the valve seat 2 by welding or integral molding, and the valve sleeve 6 has a certain length in the vertical direction so as to wrap a part of the valve core 3 .

[0042] In one embodiment, the outlet end 41 is opposite to the valve sleeve 6. It should be noted that the valve sleeve 6 has a certain length in the vertical direction and will still be offset by the impact force of the fluid medium, thereby causing the valve core 3 to be offset. In one embodiment, the valve sleeve 6 is concentrically arranged with the valve core 3, the outlet end 41 is opposite to the valve sleeve 6, and the guide 5 is obliquely connected to the outlet end 41, so that the fluid medium will not flow directly to the valve sleeve 6 under the guidance of the guide 5, thereby reducing the impact force of the fluid medium on the valve sleeve 6, thereby reducing the influence of the position offset of the valve sleeve 6 on the valve core 3.

[0043] In one embodiment, Figure 6 As shown, the valve sleeve 6 includes a mounting portion 64 and a sleeve portion 65. The mounting portion 64 has an annular groove 61 facing the inner wall of the valve seat 2. The mounting portion 64 located below the annular groove 61 has an interference fit with the inner wall of the valve seat 2. The mounting portion 64 located above the annular groove 61 has a clearance fit with the inner wall of the valve seat 2. The inner wall of the valve seat 2 has a step portion 7. When installing, first fill the annular groove 61 with solder, then place the valve sleeve 6 in the accommodating cavity 21 of the valve seat 2 until the mounting portion 64 is limited by the step portion 7. After the valve sleeve 6 is placed, solder is added to fill the gap between the mounting portion 64 and the inner wall of the valve seat 2, and then welding is performed. Compared with the spot welding technology in the prior art, this welding method can more stably weld and fix the valve sleeve 6 to the valve seat 2, ensuring the coaxiality of the valve sleeve 6 and the valve core 3.

[0044] In one embodiment, along the axial extension direction of the inner channel 42, the inner channel 42 deviates from the valve sleeve 6. The structure and principle of this embodiment are similar to the embodiment in which the inner channel 42 deviates from the valve core 3.

[0045] In one embodiment, the valve sleeve 6 is located outside the area surrounded by the extension line of the outlet end 41. At this time, only the fluid that diffuses and flows toward the circumferential side during the flow of the fluid medium will impact the valve sleeve 6. The impact force at this time is much smaller than the impact force generated by the fluid medium flowing out of the outlet end 41 opposite to the valve sleeve 6 on the valve sleeve 6, thereby reducing the position deviation of the valve core 3 caused by the position deviation of the valve sleeve 6.

[0046] In one embodiment, at least part of the valve sleeve 6 is still located within the area surrounded by the extension line of the outlet end 41, but the inner channel 42 deviates from the valve sleeve 6, and at this time, part of the fluid medium near the outside can still directly impact the valve sleeve 6. However, after the fluid medium flows out of the outlet end 41, part of the fluid near the outside will diffuse and flow toward the circumference, and the flow rate will decrease, while the flow rate of part of the fluid near the center is still relatively fast. Therefore, the impact of part of the fluid medium near the outside directly impacting the valve sleeve 6 on the valve core 3 is significantly smaller than the impact on the valve core 3 when the outlet end 41 is directly facing the valve sleeve 6, thereby still reducing the position deviation of the valve sleeve 6, and further reducing the position deviation of the valve core 3 caused by the position deviation of the valve sleeve 6.

[0047] In one embodiment, Figure 6 As shown in FIG. 1 , the valve sleeve 6 includes a first side portion 62 facing the outlet end portion 41 and a second side portion 63 away from the outlet end portion 41. The bottom end portion of the first side portion 62 has a stopper 621, and the stopper 621 is lower than the second side portion 63. The stopper 621 is higher than the second side portion 63, which means that the stopper 621 is lower than the second side portion 63 and closer to the bottom end portion of the valve seat 2. Figure 6 The bottom end of the first side portion 62 facing the outlet end 41 has a resisting portion 621, which is integrally formed with the first side portion 62. The resisting portion 621 extends the limited protection length of the valve sleeve 6 on the valve core 3, thereby increasing the resisting effect of the valve sleeve 6 on the fluid medium; and the length of the second side portion 63 in the vertical direction is shorter than that of the first side portion 62 having the resisting portion 621, so as to ensure the flow rate of the fluid medium in the valve opening state, and the fluid medium on the side away from the outlet end 41 has a relatively weak impact force on the valve core 3 or the valve sleeve 6.

[0048] In one embodiment, Figure 5As shown, the lower end of the valve seat 2 is provided with a groove 8, part of the resisting portion 621 is located in the groove 8, and the gap between the resisting portion 621 and the groove side wall corresponding to the groove 8 is not greater than the gap between the valve sleeve 6 and the valve core 3, so that the position deviation of the resisting portion 621 caused by the impact force of the fluid medium is limited by the groove 8, reducing the influence of the position deviation on the valve core 3. Further, the cross section of the resisting portion 621 is semicircular, and the semicircular resisting portion 621 can effectively resist the impact force of the fluid medium, and also take into account the flow rate. When the valve is opened, the fluid medium enters the accommodating cavity 21 of the valve core 3 from the installation port 22, and after being resisted by the valve sleeve 6 and the resisting portion 621, it flows around it to the side of the valve sleeve 6 away from the installation port 22, and then flows through the back of the semicircular resisting portion 621 through the valve port 23 and flows out.

[0049] In one embodiment, Figure 6 As shown, the resisting portion 621 is provided with a plurality of through holes 622, and the ratio of the area of ​​the through holes 622 to the surface area of ​​the resisting portion 621 is not greater than 0.7. If the area of ​​the through holes 622 is too large, the resisting effect of the resisting portion 621 will be reduced, and the impact force of the fluid medium on the valve core 3 will still be relatively large. Preferably, the ratio of the area of ​​the through holes 622 to the surface area of ​​the resisting portion 621 is not greater than 0.5, part of the fluid medium flows through the through holes 622 through the valve port 23 and flows out, and part of the fluid bypasses the resisting portion 621 and flows through the valve port 23 and flows out. The resisting portion 621 provided with the through holes 622 can, on the one hand, block part of the fluid medium from directly impacting the valve core 3 head-on, and on the other hand, ensure the flow rate of the fluid medium as much as possible. Furthermore, a plurality of through holes 622 are evenly distributed in the resisting portion 621.

[0050] In one embodiment, the distance between the valve sleeve 6 and the inner wall of the valve seat 2 is greater than the inner diameter of the main body 40, so that a flow channel with an inner diameter greater than the inner diameter of the main body 40 is formed between the valve sleeve 6 and the valve seat 2, so that the fluid medium is decelerated when entering the large flow channel from the small flow channel, further reducing the impact force of the fluid medium on the valve core 3, thereby reducing the position deviation of the valve core 3.

[0051] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution, conception, and design obtained by equivalent replacement or modification of the technical solution and inventive concept of the present invention by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A valve device, comprising a valve body (1), a valve seat (2), and a valve core (3), wherein the valve body (1) is fixed to the valve seat (2), the valve device has a valve port (23), and the valve core (3) can block or open the valve port (23), characterized in that: The valve device comprises an inlet portion (4), the inlet portion (4) is fixed to or integrally formed with the valve seat (2), and the inlet portion (4) comprises an inner channel (42); Along the axial extension direction of the inner channel (42), the inner channel (42) deviates from the valve core (3), or the inlet portion (4) has a main body portion (40) and a guide member (5), the guide member (5) is connected to the outlet end (41) of the main body portion (40), the inner channel (42) includes a main body portion channel (401) located in the main body portion (40), along the axial extension direction of the main body portion channel (401), the outlet end (41) of the main body portion (40) is opposite to the valve core (3), and the extension direction of the guide member (5) intersects with the axial extension direction of the main body portion channel (401).

2. The valve device according to claim 1, characterized in that The guide member (5) comprises a guide plate (51), the guide plate (51) is connected to the outlet end (41), and the guide plate (51) is inclined or curved toward the main body channel (401).

3. The valve device according to claim 1, characterized in that The guide member (5) comprises a guide tube (52), the guide tube (52) is connected to the outlet end (41), and the center line of the guide tube (52) deviates from the center line of the outlet end (41).

4. The valve device according to claim 1, 2 or 3, characterized in that: The valve seat (2) has a receiving cavity (21), the receiving cavity (21) is respectively connected to the main body channel (401) and the valve port (23), and at least part of the guide member (5) is located in the receiving cavity (21) of the valve seat (2).

5. The valve device according to claim 1, characterized in that Along the axial extension direction of the main body channel (401), the outlet end (41) deviates from the valve core (3), and in the axial extension direction of the main body channel (401), the projection of the valve core (3) is located outside the projection of the main body (40).

6. The valve device according to claim 1, 2, 3 or 5, characterized in that: The valve device comprises a valve sleeve (6), wherein the valve sleeve (6) is sleeved on a portion of the outer circumference of the valve core (3), and the valve sleeve (6) is fixed to the valve seat (2).

7. The valve device according to claim 6, characterized in that The valve sleeve (6) comprises a first side portion (62) facing the outlet end portion (41) and a second side portion (63) away from the outlet end portion (41), and the bottom end portion of the first side portion (62) has a stop portion (621), and the stop portion (621) is lower than the second side portion (63).

8. The valve device according to claim 7, characterized in that A groove (8) is provided at the lower end of the valve seat (2), part of the resisting portion (621) is located in the groove (8), and a gap between the resisting portion (621) and a groove side wall corresponding to the groove (8) is not greater than a gap between the valve sleeve (6) and the valve core (3).

9. The valve device according to claim 7 or 8, characterized in that The blocking portion (621) is provided with a plurality of through holes (622), and the ratio of the area of ​​the through holes (622) to the surface area of ​​the blocking portion (621) is not greater than 0.

7.

10. The valve device according to claim 7 or 8, characterized in that The distance between the valve sleeve (6) and the inner wall of the valve seat (2) is greater than the inner diameter of the main body (40).

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