Valve device

Abstract

A valve device is characterized in that the valve device comprises a valve body, a valve element and a check ring, the valve body is provided with a valve cavity and a valve port, and the valve element can move in the valve cavity in the axial direction to block or be away from the valve port; a clamping groove is formed in the inner circumferential wall of the valve body, and part of the check ring is located in the clamping groove. A step part is arranged on the outer circumferential wall of the valve element and comprises a step side wall and a step face, the check ring can abut against the step face, and the distance between the step side wall and the inner circumferential wall of the valve body is smaller than the wire diameter of the check ring. According to the embodiment, by arranging the step side wall of the step part, the distance between the step side wall and the inner peripheral wall of the valve body is smaller than the line diameter of the check ring, after the valve device is assembled, the check ring cannot penetrate through the distance between the step side wall and the inner peripheral wall of the valve body to fall off or pop up, and the safety performance of the valve device is improved.

Description

Technical Field

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

[0002] Please refer to Figure 1 , 2 , Figure 1 A schematic diagram of a valve device of the background technology; Figure 2 for Figure 1 Enlarged view of part I in the middle.

[0003] The valve device comprises a valve body 1', which is provided with a valve cavity 1b' and a valve port 1a'. The bottom of the valve body 1' is provided with a first interface part 6', and the side of the valve body 1' is provided with a second interface part 7'. A valve core 2' is also provided in the valve body 1', and the valve core 2' can move axially to block or open the valve port 1a', so as to disconnect or connect the first interface part 6' and the second interface part 7'. The valve core 2' is threadedly connected to the valve body 1'. The valve cap 4' is opened, and the valve core 2' can be rotated by operating a wrench, so that the valve core 2' can move axially along the valve body. An annular groove is provided on the side wall of the valve core 2', and a portion of the sealing ring 3' is accommodated in the annular groove 2b'. The sealing ring 3' cooperates with the inner wall of the valve body 1' to achieve sealing. A clamping groove is provided on the inner wall of the valve body 1', and a portion of the retaining ring 5' is located in the clamping groove to limit the valve core 2'. When the operating valve core 2' moves upward, it abuts against the retaining ring 5' and stops. In this solution, when the valve core is in the extreme upward position, the top of the valve core 2' is lower than the top of the slot of the valve body 1'. If the processing size exceeds the tolerance, for example Figure 2 If the groove depth t shown is too large, or the retaining ring is not properly assembled, there is a possibility that the retaining ring will fall out of the groove or even pop out, causing an accident. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a valve device, which can reduce the possibility of the retaining ring falling off or popping out of the slot. To this end, at least one embodiment of the present application adopts the following technical solution:

[0005] A valve device, characterized in that it includes a valve body, a valve core, and a retaining ring, the valve body is provided with a valve cavity and a valve port, the valve core can move axially in the valve cavity to block or move away from the valve port; the inner circumferential wall of the valve body is provided with a groove, and part of the retaining ring is located in the groove; the outer circumferential wall of the valve core is provided with a step portion, the step portion includes a step side wall and a step surface, the retaining ring can abut against the step surface, and the distance between the step side wall and the inner circumferential wall of the valve body is smaller than the wire diameter of the retaining ring.

[0006] In the above embodiment, by providing a step side wall of the step portion, the distance between the step side wall and the inner circumferential wall of the valve body is made smaller than the wire diameter of the retaining ring. After the valve device is assembled, the retaining ring cannot pass through the distance between the step side wall and the inner circumferential wall of the valve body and fall off or pop out, thereby improving the safety performance of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram of the structure of a valve device of the background technology;

[0008] Figure 2 for Figure 1 Enlarged view of part I in the middle.

[0009] Figure 3 This is a structural cross-sectional view of a valve device according to an embodiment of the present application;

[0010] Figure 4 for Figure 3 Schematic diagram of the structure of the middle valve core;

[0011] Figure 5 for Figure 4 A top view of

[0012] Figure 6 for Figure 3 A magnified view of Part II;

[0013] Figure 7 A structural cross-sectional view of a valve device according to another embodiment of the present application;

[0014] Figure 8 for Figure 7 Enlarged view of Part III. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0016] Please refer to Figure 3 , Figure 3 This is a structural cross-sectional view of a valve device in one embodiment of the present application.

[0017] The valve device in this embodiment includes a valve body 1, wherein the valve body 1 is provided with a valve chamber 1b. Figure 3 In the embodiment, a first interface portion 6 is provided at one axial end of the valve body 1. The first interface portion 6 is provided integrally with the valve body 1. Of course, the two can also be provided separately. The first interface portion 6 can be connected to an external pipeline 9 or other component interfaces. The valve body 1 is also provided with a valve port 1a. One end of the valve cavity 1b of the valve body 1 in the axial direction is communicated with the valve port 1a. Specifically, Figure 3The position where the valve cavity 1b and the first interface portion 6 communicate is the valve port 1a. The side of the valve body 1 is also provided with a second interface portion 8, which communicates with the side of the valve cavity 1b. When the valve port 1a is opened, the first interface portion 6 and the second interface portion 8 can communicate. When the valve port 1a is closed, the first interface portion 6 and the second interface portion 8 are disconnected. In this embodiment, the side of the valve device is also provided with a filling portion 7. Figure 3 The middle filling portion 7 and the second interface portion 8 are arranged radially opposite to each other. Of course, the filling portion may not be arranged.

[0018] like Figure 3 As shown, the valve device in this embodiment further comprises a valve core 2, which can move axially in the valve cavity 1b to block or move away from the valve port 1a, thereby closing or opening the valve port 1a.

[0019] The valve core 2 has an operating hole 2a at one end thereof which is axially away from the valve port 1a. Figure 3 In the figure, an operating hole 2a is provided at the upper end of the valve core 2. The operating hole 2a is a hole structure used to match with an external tool to operate the valve core 2. The operating hole 2a can be, for example, a hexagonal hole, and the external tool can correspondingly be a hexagonal wrench to rotate the valve core 2. Of course, the operating hole 2a can also be other structures, such as a cross hole. In addition, a sealing ring 3 is provided between the valve core 2 and the cavity wall of the valve cavity 1b. An annular groove 2b is provided on the outer peripheral wall of the valve core 2. Part of the sealing ring 3 is accommodated in the annular groove 2b. In this way, the sealing ring 3 can abut between the annular groove 2b and the cavity wall of the valve cavity 1b to seal the valve core 2 and the valve body 1. The annular groove 2b of the valve core 2 and the operating hole 2a are staggered in the axial direction. Can be combined Figure 4 , 3 understand, Figure 4 for Figure 3 Schematic diagram of the structure of the middle valve core; Figure 5 for Figure 4 The annular groove portion 2b has a groove top wall 2b1, a groove bottom wall 2b3 and a groove side wall 2b2. The groove bottom wall 2b3 is the side wall of the annular groove portion 2b on the side close to the valve port 1a. The groove top wall 2b1 is arranged opposite to the groove bottom wall 2b3. The groove side wall 2b2 connects the groove top wall 2b1 and the groove bottom wall 2b3. The opening of the annular groove portion 2b is opposite to the groove side wall 2b2. The annular groove portion 2b and the operating hole 2a are staggered in the axial direction, and the bottom wall of the operating hole 2a and the groove top wall 2b1 are staggered in the axial direction, that is, the bottom wall of the operating hole 2a and the groove top wall 2b1 of the annular groove portion 2b have a spacing H in the axial direction, and H>0.

[0020] So set up, from Figure 4It can be seen that the annular groove 2b is not provided on the outer annular side wall corresponding to the operating hole 2a of the valve core 2, that is, on the radial projection of the valve core 2, the operating hole 2a and the annular groove 2b do not overlap, so that the wall thickness of the valve core 2 corresponding to the operating hole 2a is not affected by the annular groove 2b, that is, the wall thickness here only needs to meet the strength requirement for the use of the operating hole 2a. Therefore, under the same product specifications, the outer diameter of the valve core 2 in this embodiment can be relatively reduced, and accordingly, the size of the valve body 1 matched therewith can also be reduced, and the sealing ring 3, the valve cap 5 described below, etc. can reduce the radial size, so as to achieve the purpose of reducing the product volume and weight and reducing the cost.

[0021] The outer peripheral wall of the valve core 2 may also be provided with an external thread section 2d, and the cavity wall of the valve cavity 1b of the valve body 1 is provided with an internal thread section. The external thread section 2d of the valve core 2 and the internal thread section of the valve cavity 1b are threadedly matched, and the operation hole 2a of the valve core 2 is operated to drive the valve core 2 to rotate, thereby achieving the purpose of axial movement. At this time, the external thread section 2d of the valve core 2 is closer to the valve port 1a than the annular groove portion 2b thereof, that is, the external thread section 2d is arranged below the annular groove portion 2b.

[0022] Please continue to refer to Figure 4 In this embodiment, there is a radial spacing T between the hole wall of the operating hole 2a and the groove side wall 2b2 of the annular groove portion 2b, and the radial spacing T is less than 1mm. Since the operating hole 2a and the annular groove portion 2b are staggered in the axial direction in this embodiment, the strength requirement for operating the operating hole 2a is no longer subject to the radial distance T between the inner surface of the hole wall of the operating hole 2a and the groove side wall 2b2, so the radial spacing T can be set as small as possible, and the radial size of the valve core 2 can also be as small as possible. Under the premise that the overall strength of the valve core 2 allows, the radial spacing T can also be a negative number, that is, the aperture of the operating hole 2a can be larger than the inner diameter of the annular groove portion 2b. It can be seen from this that the volume of the valve core 2 in this embodiment can be further reduced, and the volume of the valve body 1 is also further reduced accordingly.

[0023] As mentioned above, the operating hole 2a can be a hexagonal hole, so as to facilitate the cooperation with a conventional tool wrench. When the operating hole 2a is a hexagonal hole, the radial distance T between the top angle 2a1 of the operating hole 2a and the groove side wall 2b2 of the annular groove portion 2b is less than 1 mm. That is, the maximum aperture of the operating hole 2a in this embodiment ( Figure 5 The radial distance T between the inner surface of the hole wall corresponding to the position with the maximum hole diameter (K) and the groove side wall 2b2 of the annular groove portion 2b can be set as small as possible.

[0024] In this structure, the height of the operating hole 2a can be set to be less than 1 / 2 of the height of the valve core 2, so that the strength of the operating hole can be guaranteed and the part of the valve core below the operating hole has a higher strength anti-torsion performance.

[0025] Furthermore, if Figure 3 As shown, the valve body 1 in this embodiment is also equipped with a retaining ring 5, which generally refers to an elastic retaining ring 5, that is, it has a certain deformation ability. Specifically, the cavity wall of the valve body 1 is provided with an annular groove 1c, and part of the retaining ring 5 is located in the groove 1c, which is easy to install. The retaining ring 5 can be formed by winding a metal wire, and the cross section is circular, which is simple to process and convenient for mass production. The retaining ring has a notch and can be elastically deformed toward the inside, so that when installing the retaining ring, the retaining ring can be squeezed to reduce the outer diameter, and installed from the top of the valve body 1 downward. When entering the groove 1c, the retaining ring is elastically deformed again, expands outward, and the outer diameter increases, so that it is confined in the groove 1c.

[0026] A step portion 2c is also provided on the outer peripheral wall of the valve core 2 above the annular groove portion 2c, that is, the annular groove portion 2c is closer to the valve port 1a relative to the step portion 2c. The step portion 2c includes a step side wall 2c1 and a step surface 2c2, the step surface 2c2 is away from the annular groove portion 2b, and the step surface 2c2 of the step portion 2c is arranged toward the upper side. When the valve is opened, the retaining ring 5 can abut against the step surface 2c2 in the axial direction. In this way, the retaining ring 5 can limit the valve core 2 axially to play the role of upward limiting, that is, to ensure that the valve core 2 can be limited when the valve port 1a is opened to the maximum opening. Such a configuration not only achieves the limitation of the valve core 2, but also facilitates the installation of the valve core 2. Figure 3 In the embodiment, the valve core 2 can be directly installed into the valve cavity 1b of the valve body 1 along the axial direction from top to bottom, and then the retaining ring 5 is installed, so the assembly is relatively simple and fast.

[0027] The distance X between the step side wall 2c1 and the inner peripheral wall of the valve body 1 is smaller than the diameter Y of the retaining ring. An annular space is formed between the step side wall 2c1 and the inner peripheral wall of the valve body 1, and the radial distance of the space is smaller than the diameter Y of the retaining ring. In this way, after the retaining ring is assembled in place, the valve core 2 is inserted from the top of the valve body 1 downward, and the groove 1c of the valve body 1 and the step 2c will constrain the retaining ring 5 in the limited space. Figure 6 In the state shown, the valve core 2 moves upward to the limit position, and the step surface 2c2 abuts against the retaining ring 5. As long as the spacing X is smaller than the wire diameter Y of the retaining ring, even if the processing size exceeds the tolerance as described in the background technology, such as the groove depth is too small, or the retaining ring is not assembled in place, the retaining ring cannot be disengaged from the groove, let alone the situation of passing through the gap between the step side wall and the inner peripheral wall of the valve body and popping out. That is, the above structure basically eliminates the possibility of the retaining ring being disengaged from the groove from the source of design.

[0028] At least a portion of the valve core 2 that is radially corresponding to the operating hole 2a forms a portion of the step side wall 2c1, that is, in the axial direction, at least a portion of the step side wall 2c1 is at the same height as at least a portion of the operating hole. This structure is more convenient for processing the step portion and the operating hole. The distance from the slot 1c to the top of the valve body 1 is less than the height of the step side wall 2c1, so that when the retaining ring 5 abuts against the step surface 2c2, the top of the valve core 2 is higher than the top of the valve body 1. In this way, the height of the top of the valve core 2 extending out of the valve body 1 can be flexibly set according to the needs of the operating hole, and the strength of the operating hole can be ensured. In this embodiment, the operating hole 2a and the annular groove 2b are staggered in the axial direction, so the valve core 2 can be extended in the axial direction. In this way, the valve body 1 does not need to be modified in any way, and the valve core 2 only needs to be extended in the axial direction by a certain distance to set the required operating hole 2a. Compared with the entire valve body 1, the change of the valve core 2 is easier to achieve, and the impact on the volume can also be ignored.

[0029] In addition, it should be noted that the stepped side wall 2c1 does not necessarily have to extend to the top of the valve core with a constant diameter. In other words, the stepped side wall 2c1 itself can also be provided with a stepped portion so that the outer diameter of the portion close to the top of the valve core becomes smaller. That is, as long as a portion of the stepped side wall above the stepped surface 2c2 has a preset distance X from the inner peripheral wall of the valve body, the blocking of the retaining ring can be achieved.

[0030] The valve device may further include a valve cap 4, the valve cap 4 is provided with an internal thread, the outer peripheral wall of the valve body 1 may be provided with an external thread, and the valve cap 4 and the valve body 1 are threadedly connected. Figure 3 In the embodiment, the upper part of the valve body 1 is provided with an external thread section, which is threadedly connected with the valve bonnet 4. At this time, the end of the valve core 2 protruding from the valve body 1 can be located in the valve bonnet 4, so that the valve bonnet 4 can protect the valve body 1 and the valve core 2. It can be seen that when the valve bonnet 4 is threadedly connected with the valve body 1, it also has a certain distance from the end face of the valve body 1 in the axial direction, so the internal space of the valve bonnet 4 can accommodate the extended valve core 2, and the size of the valve device in the axial direction remains unchanged, or the valve bonnet 4 can also increase a certain height according to the extension distance of the valve core 2 to accommodate the extended valve core 2. Since the valve bonnet 4 itself has a certain accommodation space, even if the valve bonnet 4 needs to increase in height, the increased height is small, and can be ignored for the overall volume of the valve device.

[0031] Please continue to refer to Figure 4 In this embodiment, when the step portion 2c is set to cooperate with the retaining ring 5, the outer diameter of the step side wall 2c1 of the step portion 2c is greater than the inner diameter D1 of the annular groove portion 2b, so as to maximize the wall thickness of the operating hole 2a, reduce the impact of the set step portion 2c on the wall thickness of the side wall of the operating hole 2a, and ensure the strength of the side wall of the operating hole 2a. Figure 4It is shown in the figure that when the step portion 2c is not provided, the wall thickness of the operation hole 2a is D2, D2 is also the outer diameter of the annular groove portion 2b, and the outer diameter of the step side wall 2c1 is between D1 and D2.

[0032] Combine the following Figure 7 , Figure 8 , describing another embodiment of the present application.

[0033] The core of each embodiment of the present application is to set the step side wall of the step portion so that the distance between the step side wall and the inner circumferential wall of the valve body is smaller than the wire diameter of the retaining ring, so as to prevent the retaining ring from falling off or popping out, thereby improving the safety performance of the valve device. The above-mentioned first embodiment provides a valve device with a specific structure, especially a valve core structure. Obviously, the technical concept of the present application is not only applicable to the case of the first embodiment, but also can be improved by improving the technical solution of the background technology to obtain the second embodiment of the present application. Compared with the first embodiment, the main difference is that there is a difference in the valve core structure. For the convenience of description and to avoid the description being too lengthy, the same figure mark is used for the components in the second embodiment that have basically the same structure and function as those in the first embodiment, and only a brief description is given, focusing on the different structures.

[0034] The valve device includes a valve body 1. The valve body 1 can refer to the structure of the first embodiment and has a valve cavity 1b. A first interface portion 6 is provided at one axial end of the valve body 1. The first interface portion 6 can be connected to an external pipeline 9 or other component interface. The valve body 1 is provided with a valve port 1a. One end of the valve cavity 1b of the valve body 1 in the axial direction is connected to the valve port 1a. A second interface portion 8 is provided on the side of the valve body 1. The second interface portion 8 is connected to the side of the valve cavity 1b. When the valve port 1a is opened, the first interface portion 6 and the second interface portion 8 can be connected. When the valve port 1a is closed, the first interface portion 6 and the second interface portion 8 are disconnected. In this embodiment, a filling portion 7 is also provided on the side of the valve device. The filling portion 7 and the second interface portion 8 are arranged opposite to each other in the radial direction. The valve device can also include a valve cap 4. The valve cap 4 is provided with an internal thread. The outer peripheral wall of the valve body 1 can be provided with an external thread. The valve cap 4 is threadedly connected to the valve body 1. The upper part of the valve body 1 is provided with an external thread section, which is threadedly connected to the valve cap 4. The cavity wall of the valve body 1 is provided with an annular groove 1c, and part of the retaining ring 5 is located in the groove 1c. The structures of the groove 1c and the retaining ring 5 can refer to the description of the first embodiment, and will not be repeated here.

[0035] The valve core 21 can move axially in the valve cavity 1b to block or move away from the valve port 1a. Specifically, the outer peripheral wall of the valve core 21 is provided with an external thread section, and the cavity wall of the valve cavity 1b of the valve body 1 is provided with an internal thread section. The external thread section of the valve core 2 and the internal thread section of the valve body are threadedly matched. By operating the operating hole 21a of the valve core 21, the valve core 2 can be driven to rotate, thereby achieving the purpose of axial movement. The valve core 21 is provided with an operating hole 21a at one end away from the valve port 1a. The operating hole 21a can be a hexagonal hole. When the valve device needs to be operated, the valve core 21 can be rotated using a hexagonal wrench. A sealing ring 3 is provided between the valve core 21 and the cavity wall of the valve cavity 1b. The outer peripheral wall of the valve core 21 is provided with an annular groove portion 2b. Part of the sealing ring 3 is accommodated in the annular groove portion 2b to seal between the valve core 21 and the valve body 1. Different from the first embodiment, the annular groove 2b and the operating hole 21a are not offset in the axial direction, that is, in the height direction, the radial projections of the annular groove 2b and the operating hole 21a overlap.

[0036] On the outer peripheral wall of the valve core 21, above the annular groove 2c, a step portion 2c is provided. The step portion 2c includes a step side wall 21c1 and a step surface 21c2. The step surface 21c2 is provided away from the annular groove 2b. Figure 8 As shown in the cross-sectional view, the step surface 21c2 and the side wall of the valve core 21 form an angle. When the valve core 21 moves upward to the limit position, the step surface 21c2 abuts against the retaining ring 5 to limit the valve core 21.

[0037] The distance X between the step side wall 21c1 and the inner peripheral wall of the valve body 1 is smaller than the diameter Y of the retaining ring. An annular space is formed between the step side wall 21c1 and the inner peripheral wall of the valve body 1, and the radial distance of the space is smaller than the diameter Y of the retaining ring. In this way, after the retaining ring is assembled in place, the valve core 21 is inserted from the top of the valve body 1 downward, and the groove 1c of the valve body 1 and the step portion 21c will constrain the retaining ring 5 in the limited space. Figure 8 In the state shown, the valve core 2 moves upward to the limit position, and the step surface 21c2 abuts against the retaining ring 5. As long as the spacing X is smaller than the wire diameter Y of the retaining ring, even if the processing size exceeds the tolerance as described in the background technology, such as the groove depth is too small, or the retaining ring is not assembled in place, the retaining ring cannot be disengaged from the groove, let alone the situation of passing through the gap between the step side wall and the inner peripheral wall of the valve body and popping out. That is, the above structure basically eliminates the possibility of the retaining ring being disengaged from the groove from the source of the design.

[0038] Similar to the first embodiment, the step side wall 21c1 does not necessarily have to extend to the top of the valve core with the same diameter. Figure 8As shown, a reduced diameter portion 21c4 is also provided above the step side wall 21c1, and the outer diameter of the reduced diameter portion 21c4 is smaller than the outer diameter of the step side wall 21c1, and a transition portion 21c3 is used to transition between the step side wall 21c1 and the reduced diameter portion 21c4. The step side wall is closer to the valve port relative to the reduced diameter portion 21c4 and the transition portion 21c3. The reduced diameter portion 21c4 and the transition portion 21c3 can also be regarded as another step portion structure. That is, in this embodiment, it is only necessary to ensure that the step side wall 21c1 has a certain height, and the spacing X between the step side wall 21c1 and the inner peripheral wall of the valve body is smaller than the wire diameter Y of the retaining ring to achieve the corresponding technical effect. The provision of the reduced diameter portion 21c4 and the transition portion 21c3 can further reduce the material usage of the valve core 21, which is conducive to reducing the manufacturing cost.

[0039] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A valve device, characterized in that: The invention comprises a valve body (1), a valve core and a retaining ring (5), wherein the valve body (1) is provided with a valve cavity (1b) and a valve port (1a), and the valve core can move axially in the valve cavity (1b) to block or move away from the valve port (1a); the inner peripheral wall of the valve body (1) is provided with a retaining groove (1c), and part of the retaining ring (5) is located in the retaining groove (1c); the outer peripheral wall of the valve core is provided with a step portion, and the step portion includes a step side wall and a step surface, and the retaining ring (5) can abut against the step surface, and the distance (X) between the step side wall and the inner peripheral wall of the valve body (1) is smaller than the wire diameter (Y) of the retaining ring (5).

2. The valve device according to claim 1, characterized in that The cross section of the retaining ring (5) is circular, and the retaining ring (5) is formed by winding a metal wire.

3. The valve device according to claim 2, characterized in that The retaining ring (5) has a notch, and the retaining ring (5) can be elastically deformed toward the inside.

4. The valve device according to claim 1, characterized in that An operating hole is formed at one end of the valve core axially away from the valve port (1a), and at least a portion of the outer wall of the valve core radially corresponding to the operating hole forms a portion of the step side wall.

5. The valve device according to claim 4, characterized in that The distance from the slot (1c) to the top of the valve body (1) is less than the height of the step side wall, and when the retaining ring (5) abuts against the step surface, the top of the valve core is higher than the top of the valve body (1).

6. The valve device according to claim 4, characterized in that The step portion comprises a reduced diameter portion (21c4) and a transition portion (21c3); the step side wall is closer to the valve port than the reduced diameter portion (21c4) and the transition portion (21c3); when the retaining ring (5) abuts against the step surface, the top end of the valve core is higher than the top end of the valve body (1).

7. The valve device according to claim 6, characterized in that The outer diameter of the reduced diameter portion (21c4) is smaller than the outer diameter of the step side wall.

8. The valve device according to claim 5 or 6, characterized in that: An annular groove (2b) is formed on the outer peripheral wall of the valve core. The annular groove (2b) is closer to the valve port (1a) than the step portion (2c). There is an axial distance between the annular groove (2b) and the bottom wall of the operating hole (2a).

9. The valve device according to claim 5 or 6, characterized in that: The height of the operating hole (2a) is less than 1 / 2 of the height of the valve core (2, 21).

10. The valve device according to claim 5 or 6, characterized in that The valve device further comprises a valve bonnet (4), the valve bonnet (4) being threadedly connected to a portion of the outer wall of the valve body (1), and the top end of the valve core (2, 21) is located inside the valve bonnet (4).

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