Valve device and gas system

Abstract

The invention provides a valve device and a fuel gas system. The valve device is beneficial to quick cut-off to realize valve closing. The valve device comprises a valve body part, a valve rod part and a stop pin assembly, the valve body part is provided with a matching wall, the valve rod part comprises a valve rod and a sealing part, the valve rod is provided with an abutting part, and the stop pin assembly comprises a stop pin; in the first working state, the sealing part and the matching wall are staggered in the axial direction; in the second working state, the sealing part moves by a first distance in the axial direction relative to the first working state, the sealing part abuts against the matching wall in the radial direction to close the valve device, and the abutting part abuts against the stop pin; in a third working state, the sealing part moves a second distance along the first direction relative to the second working state; the valve body component or the valve rod is provided with a reset face, and in the third working state, the valve rod component can rotate so that the abutting portion can be in contact fit with the reset face arranged on the valve body component, or the stop pin can be in contact fit with the reset face arranged on the valve rod, and the valve rod component moves and resets in the second direction.

Description

[0001] This application claims priority to Chinese Patent Application No. 202411603553.6, filed on November 11, 2024, entitled "A Valve Device and a Gas System", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of valve technology, specifically to a valve device and a gas system. Background Technology

[0003] A gas system includes a main gas switch, main gas pipes, branch gas pipes, burners, and stopcocks. Each branch gas pipe is connected to the main gas pipe via a stopcock, which controls the flow of gas between the branch and main pipes. Each branch gas pipe has a corresponding burner to which gas is supplied. The gas system corresponds to gas-using equipment, such as ovens. These devices have control panels to control the gas flow. However, the main gas switch is often located far from the control panel or is concealed. This means that in the event of a stopcock malfunction leading to a gas leak or fire, the gas supply cannot be quickly shut off. Summary of the Invention

[0004] The purpose of this application is to provide a valve device and a gas system, wherein the valve device facilitates rapid shut-off to achieve valve closure.

[0005] To solve the above-mentioned technical problems, this application provides a valve device, including a valve body component, a valve stem component, and a stop pin assembly. The valve body component is provided with a mating wall, the valve stem component includes a valve stem and a sealing part, the valve stem is provided with a stop part, and the stop pin assembly includes a stop pin. The stop pin assembly is installed on the valve body component.

[0006] The valve device is in the first working state, the sealing part is axially offset from the mating wall, and the valve device is open;

[0007] The valve device is in a second working state. The sealing part moves axially a first distance relative to the first working state. The moving direction is a first direction. The sealing part abuts against the mating wall radially to close the valve device. The abutting part abuts against the stop pin in a second direction. The first direction and the second direction are opposite.

[0008] The valve device is in a third working state, the sealing part moves a second distance in a first direction relative to the second working state, and the abutting part and the stop pin are axially offset.

[0009] The valve body component or the valve stem has a reset surface. In the third working state, the valve stem component can rotate so that the abutment part contacts and engages with the reset surface of the valve body component, or so that the stop pin contacts and engages with the reset surface of the valve stem. The valve stem component moves along the second direction to return to the first working state.

[0010] The valve device in this application, by incorporating a stop and a stop pin, allows the valve stem component to move axially when valve closure is required. This allows the stop to pass the stop pin, which then holds it at its axial limit, maintaining the valve stem component in a second operating state of valve closure. In other words, valve closure can be achieved simply by moving the valve stem component, making operation convenient. For example, when applied to a gas system, it can quickly cut off gas supply, improving safety. To reopen the valve device, the valve stem component needs to be rotated a certain angle, engaging with the reset surface. Under the action of the reset surface, the valve stem component returns to its first operating state. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the valve device in one embodiment of this application;

[0012] Figure 2 for Figure 1 Axial sectional view of the central valve assembly;

[0013] Figure 3 for Figure 1 Axial sectional view of the valve assembly from another angle;

[0014] Figure 4 for Figure 1 A schematic diagram of the structure of the first valve body;

[0015] Figure 5 for Figure 4 A schematic diagram of the structure of the first valve body section viewed axially.

[0016] Figure 6 for Figure 4 A schematic diagram of the first valve body section viewed axially from another perspective;

[0017] Figure 7 for Figure 1 Schematic diagram of the structure of the second valve body;

[0018] Figure 8 for Figure 7 A cross-sectional view of the second valve body along the axial direction;

[0019] Figure 9 for Figure 1 A three-dimensional structural diagram of the valve stem component;

[0020] Figure 10 for Figure 9 Front view of the valve stem assembly;

[0021] Figure 11 for Figure 3 A three-dimensional structural diagram of the center stop pin;

[0022] Figure 12 for Figure 3 Front view of the center stop pin;

[0023] Figure 13 for Figure 12 The left view;

[0024] Figure 14 for Figure 2 A schematic diagram of the structure of the valve stem component after it has been moved down a certain distance;

[0025] Figure 15 for Figure 3 A schematic diagram of the structure of the valve stem component after it has been moved down a certain distance;

[0026] Figure 16 for Figure 14 A schematic diagram of the structure of the valve stem component after it has been moved down a certain distance;

[0027] Figure 17 for Figure 15 A schematic diagram of the structure of the valve stem component after it has been moved down a certain distance;

[0028] Figure 18 for Figure 4 A schematic diagram of the first valve body without the limiting part installed;

[0029] Figure 19 for Figure 4 Schematic diagram of the middle limiting part;

[0030] Figure 20 for Figure 19 Front view of the middle limiting part;

[0031] Figure 21 for Figure 4 Enlarged schematic diagram of the position of the middle limiting part;

[0032] Figure 22 for Figure 18 Enlarged schematic diagram of the mounting slot location;

[0033] Figure 23 for Figure 17 Sectional view along line AA in the middle;

[0034] Figure 24 for Figure 23 Enlarged view of part B in the middle;

[0035] Figure 25 for Figure 16A schematic diagram of the structure of the valve stem component after it has been moved down a certain distance;

[0036] Figure 26 for Figure 17 A schematic diagram of the structure of the valve stem component after it has been moved down a certain distance;

[0037] Figure 27 for Figure 26 Schematic diagram of cross-section along the CC direction;

[0038] Figure 28 for Figure 27 Enlarged view of part D in the middle;

[0039] Figure 29 for Figure 1 Top view of the central valve assembly;

[0040] Figure 30 This is a schematic diagram of the valve stem component of the valve device in another embodiment of this application;

[0041] Figure 31 for Figure 30 Enlarged schematic diagram of part E in the middle;

[0042] Figure 32 for Figure 21 A structural schematic diagram of the limiting part position in the valve stem assembly;

[0043] Figure 33 for Figure 30 Front view of the valve stem assembly;

[0044] Figure 34 This is a structural schematic diagram of the valve device in another embodiment of this application, and is an axial cross-sectional view. At this time, the valve stem component is in the first state.

[0045] Figure 35 for Figure 34 A structural schematic diagram of the central valve device from another angle;

[0046] Figure 36 The diagram shown is a structural schematic of the first valve body portion of the valve device in another embodiment of this application;

[0047] Figure 37 for Figure 36 Axial sectional view of the first valve body section;

[0048] Figure 38 This is a schematic diagram of the gas system in an embodiment of this application.

[0049] The annotations in the attached figures are explained as follows:

[0050] 100 valve device;

[0051] 10 Valve stem assembly; 101 Valve stem; 101a Second mounting hole; 1011 Valve stem guide; 1011a Second annular groove; 1012 Straight wall; 102 Sealing part; 1021 Sealing end; 1021a First annular groove; 1022 Limiting boss; 1023 First sealing ring; 103 Abutment part; 104 Second sealing ring;

[0052] 20 Valve body component; 201 First valve body portion; 21 First channel portion; 21a First flow channel; 22 Mounting portion; 22a First mounting hole; 23 First valve body; 231 Reset surface; 232 Top wall of groove; 233 Side wall of first groove; 234 Side wall of second groove; 235 Restricting surface; 23a First cavity; 23b First slide groove; 23c Mounting groove; 23d Through hole; 24 First connecting portion; 202 Second valve body portion; 2021 Second valve body; 20211 Mating wall; 20212 Stop surface; 2022 Second channel portion; 2023 Second connecting portion; 202a Second flow channel; 202b Second cavity; 20a Valve cavity; 2024 Third connecting portion;

[0053] 30 connecting bolts;

[0054] 40. Stop pin assembly; 401. Stop pin; 4011. Small diameter section; 4011a. Inclined surface; 4012. Large diameter section; 4012a. Straight surface; 40121. Stepped surface; 402. Plug; 403. Second elastic component;

[0055] 50 First elastic component;

[0056] 60 Limiting part; 601 Limiting boss; 6011 Limiting surface; 6012 First guide surface; 6013 Second guide surface; 602 Limiting base; 100a First slide rail;

[0057] 10a Second Slide;

[0058] 1011b Valve stem groove; 1011b1 Second slide groove; 1011b2 Reset groove; 10111 Bottom wall; 10111a Abutment part; 10112 Reset surface; 10113 Third guide surface; 10114 Upper circumferential wall of slide rail; 10115 Side wall of third groove; 10115a Notch; 10116 Lower circumferential wall of slide rail; 10117 Upper circumferential wall of slide rail; 10118 Side wall of fourth groove; 10119 Reset boss;

[0059] 200 Main gas circuit switch; 300 Main gas pipe; 400 Branch gas pipe; 500 Burner; 600 Control valve. Detailed Implementation

[0060] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. In the embodiments of this application, the terms "first," "second," etc., are only used to distinguish the same or similar structures, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0061] Please refer to Figures 1 to 3 understand, Figure 1 This is a schematic diagram of the valve device 100 in one embodiment of this application; Figure 2 for Figure 1 Axial sectional view of the central valve device 100; Figure 3 for Figure 1 Another axial sectional view of the central valve device 100 from another angle.

[0062] This embodiment provides a valve device 100, which can be a gas safety valve, but can also be applied to other situations where the flow rate of the medium needs to be regulated. When the valve device 100 is a gas safety valve, the medium is gas. Figure 2 The arrows in the middle indicate the direction of gas flow.

[0063] The valve device 100 includes a valve body component 20, a valve stem component 10, and a stop pin assembly 40. The valve body component 20 has a valve cavity 20a. In this embodiment, the valve body component 20 is a split structure, including a first valve body portion 201 and a second valve body portion 202. The first valve body portion 201 has a first cavity 23a, and the second valve body portion 202 has a second cavity 202b. The valve cavity 20a includes both the first cavity 23a and the second cavity 202b. The valve stem component 10 includes a valve stem 101 and a sealing portion 102. A portion of the valve stem component 10 is located within the valve cavity 20a of the valve body component 20. The valve body component 20 is provided with a mating wall 20211, such as... Figure 2 As shown, the portion of the wall corresponding to the valve cavity 20a is the mating wall 20211, which is an annular wall. The valve stem component 10 can move axially so that its sealing part 102 and the mating wall 20211 abut against each other, specifically, it abuts against the mating wall 20211 radially, thereby closing the valve device 100. At this time, the valve device 100 is in the second working state. Alternatively, the valve stem component 10 can move axially away from the mating wall 20211, thereby opening the valve device 100. At this time, the valve device 100 is in the fully open first working state, i.e., the first working state is the open valve state. In the second working state, the valve device 100 is closed.

[0064] In this embodiment of the application, the direction in which the valve stem component 10 moves axially to close the valve device 100 is defined as the first direction, which is also... Figure 3The downward direction is defined as the first direction, and the opposite direction is the second direction or the upward direction. The vertical direction, i.e., the axial, circumferential, and radial directions of the valve device 100, are all defined based on this.

[0065] like Figure 2 , 3 As shown, the valve body component 20 includes a first channel portion 21 and a second channel portion 2022. The first channel portion 21 is disposed in the first valve body portion 201, and the second channel portion 2022 is disposed in the second valve body portion 202. The first channel portion 21 and the second channel portion 2022 can extend radially. The first channel portion 21 has a first flow channel 21a, and the second channel portion 2022 has a second flow channel 202a. The first flow channel 21a connects to a first cavity 23a, and the second flow channel 202a connects to a second cavity 202b. The first cavity 23a and the second cavity 202b extend approximately axially and are axially joined together. The upper part of the second cavity 202b corresponds to the aforementioned mating wall 20211. The wall of the second cavity 202b has an interface connecting to the second flow channel 202a, and the mating wall 20211 is located above this interface.

[0066] When the sealing part 102 and the mating wall 20211 abut radially, the first flow channel 21a and the second flow channel 202a are disconnected. When the sealing part 102 axially disengages from the mating wall 20211, the first cavity 23a and the second cavity 202b remain connected, and the first flow channel 21a and the second flow channel 202a remain connected. The valve device 100 is opened to be in the first working state. The external port of the first flow channel 21a can be used as a gas outlet, and the external port of the second flow channel 202a can be used as an inlet. When the valve device 100 is opened, gas can enter the valve cavity from the second flow channel 202a and flow out from the first flow channel 21a.

[0067] The structure of the valve body component 20, valve stem component 10, and stop pin assembly 40 of the valve device 100 in this embodiment will be described in detail below.

[0068] like Figures 4 to 7 As shown, Figure 4 for Figure 1 A schematic diagram of the structure of the first valve body 201; Figure 5 for Figure 4 A schematic diagram of the structure of the first valve body 201 viewed axially; Figure 6 for Figure 4 A schematic diagram of the first valve body 201 viewed from another angle along the axial section; Figure 7 for Figure 1 Schematic diagram of the structure of the second valve body 202; Figure 8 for Figure 7 A cross-sectional view of the second valve body 202 along the axial direction.

[0069] As mentioned above, the valve body component 20 in this embodiment is a split structure, including a first valve body portion 201 and a second valve body portion 202, which are axially connected. The first valve body portion 201 includes a first valve body 23, the aforementioned first channel portion 21, and a first connecting portion 24. The first valve body portion 201 can be an integral structure. The first valve body 23 is a generally axially extending cylindrical structure. The first channel portion 21 is radially disposed on the side of the first valve body 23, and the side of the first valve body 23 is also provided with a radially extending first connecting portion 24.

[0070] The second valve body 202 includes a second valve body 2021, the aforementioned second channel portion 2022, and a second connecting portion 2023. The second valve body 202 can be an integral structure. After the first valve body 23 and the second valve body 2021 are axially connected, the first connecting portion 24 and the second connecting portion 2023 are also connected. The connecting holes on the first connecting portion 24 and the second connecting portion 2023 correspond, thereby allowing passage through... Figure 1 The connecting bolts 30 shown are used for connection and fixation. The mating end faces of the first valve body part 201 and the second valve body part 202 are sealed, for example, a sealing ring is embedded in one of the mating end faces. The valve body component 20 is set as a split structure, which facilitates processing and assembly of parts. It can be seen that it can also be set as a whole without affecting the assembly.

[0071] The second valve body 202 may be provided with a third connecting part 2024 for connecting with the client. The third connecting part 2024 is provided with an annular groove that can accommodate a sealing structure. The sealing structure may also be a sealing ring for sealing cooperation with the client.

[0072] Let's look again. Figure 9 and Figure 10 , Figure 9 for Figure 1 A three-dimensional structural schematic diagram of the valve stem component 10; Figure 10 for Figure 9 Front view of valve stem component 10.

[0073] In this embodiment, the valve stem component 10 includes a valve stem 101 and a sealing portion 102. The valve stem 101 is a rod extending axially. In this embodiment, the sealing portion 102 includes a sealing end 1021 and a first sealing ring 1023 (shown in the figure) installed on the sealing end 1021. Figure 3 The sealing part 102 is located at one end of the valve stem 101, and the sealing end 1021 and the valve stem 101 can be as follows: Figure 9 The integrated structure shown can also be configured as separate parts. The sealing end 1021 has a first annular groove 1021a, and a portion of the first sealing ring 1023 is embedded within the first annular groove 1021a, as shown below. Figure 2 , 3As shown, when the valve stem component 10 moves downward into the second cavity 202b, the first sealing ring 1023 of the sealing portion 102 of the valve stem component 10 can abut radially against the mating wall 20211 to achieve a sealing fit. It is understood that providing the first sealing ring 1023 is merely one embodiment; the entire sealing portion 102 can also be made of an elastic material or the outer peripheral wall of the sealing portion 102 can be made of an elastic material to cooperate and seal with the mating wall 20211.

[0074] In addition, the upper part of the valve stem 101 may be provided with a straight wall 1012 extending along the axial direction to facilitate rotation. In some embodiments, the upper part of the valve stem 101 may be connected to an operation button, so that the operation button can be directly rotated to drive the rotation during manual operation.

[0075] like Figure 9 , 10 As shown, a portion of the valve stem 101 can protrude radially to form a valve stem guide portion 1011. Now let's look at... Figure 2 , 3 The top of the first valve body 201 has a through hole 23d, through which the valve stem 101 passes. The valve stem guide 1011 and the inner wall of the upper part of the first cavity 23a slide together, which guides the valve stem component 10 to move axially. The valve stem guide 1011 can be provided with a second annular groove 1011a. A second sealing ring 104 can be embedded in the second annular groove 1011a. The second sealing ring 104 abuts against the inner wall of the first cavity 23a radially, which also achieves a sealing fit between the valve stem component 10 and the first valve body 201, preventing the gas in the valve cavity 20a from leaking from the through hole 23d of the first valve body 201.

[0076] Furthermore, in this embodiment, the valve stem 101 is provided with abutment portion 103, which protrudes radially from the valve stem 101. Specifically, Figure 9 The limiting pin structure shown is as follows: Figure 10 As shown, the valve stem 101 may be provided with a second mounting hole 101a, which may be formed radially recessed from the outer peripheral wall of the valve stem 101. The abutment portion 103 may be inserted into the second mounting hole 101a and fixedly connected, for example, by press-fitting into the second mounting hole 101a. In the axial direction, the abutment portion 103 is located above the sealing portion 102, and the abutment portion 103 may cooperate with the limiting portion 60, the stop pin 401, and the reset surface 231 described below.

[0077] You can continue to refer to this. Figure 3 and combined Figures 11 to 13 understand, Figure 11 for Figure 3 A three-dimensional structural diagram of the center stop pin 401; Figure 12 for Figure 3 Front view of center stop pin 401; Figure 13 for Figure 12The left view.

[0078] The valve device 100 in this embodiment further includes a stop pin assembly 40, which is mounted on the valve body component 20, specifically on the first valve body portion 201. The stop pin assembly 40 includes a stop pin 401. The first valve body portion 201 is provided with a mounting portion 22, which also protrudes radially from the first valve body 23. The mounting portion 22 and the first channel portion 21 are located on different sides of the first valve body 23. The mounting portion 22 is provided with a first mounting hole 22a, which is a through hole. One end of the first mounting hole 22a communicates with the valve cavity 20a, specifically with the first cavity 23a. The stop pin 401 is installed in the first mounting hole 22a, and one end of the stop pin 401 can extend into the valve cavity 20a. The stop pin assembly 40 also includes a second elastic component 403 and a plug 402. The second elastic component 403 is specifically a spring, and the plug 402 can seal the other end of the first mounting hole 22a. The second elastic component 403 is disposed between the stop pin 401 and the plug 402. In this way, when the stop pin 401 is not subjected to the force of other components, the stop pin 401 is kept in the position of extending into the first cavity 23a under the pressure of the second elastic component 403.

[0079] Figure 3 In this design, mounting hole 22a is a stepped hole, and stop pin 401 has a stepped shaft structure, including a large-diameter section 4012 and a small-diameter section 4011. The small-diameter hole of the stepped hole connects to the first cavity 23a. Part of the small-diameter section 4011 of the stop pin 401 is located in the small-diameter hole, while part can extend out of the small-diameter hole and be located within the first cavity 23a. The stepped surface 40121 formed between the large-diameter section 4012 and the small-diameter section 4011 of the stop pin 401 can abut against the stepped surface of the first mounting hole 22a. This prevents the stop pin 401 from extending excessively into the first cavity 23a, thus providing a certain limiting effect on the stop pin 401. The large-diameter section 4012 can be provided with a straight surface 4012a. Figure 13 The cross-section of the large-diameter section 4012 is approximately D-shaped. The large-diameter hole corresponding to the first mounting hole 22a and the large-diameter hole of the large-diameter section 4012 can also be D-shaped. This prevents the stop pin 401 from rotating, ensuring that the inclined surface 4011a of the stop pin 401 (mentioned below) can always face upwards, thus facilitating its engagement with the abutment part 103. Clearly, the stop pin 401 and the first mounting hole 22a only need to be in a non-rotational engagement; it is not limited to having a flat surface 4012a. For example, the cross-section of the stop pin 401 could be square, and the large-diameter hole of the first mounting hole 22a could be square, etc. This embodiment does not impose specific limitations.

[0080] like Figure 3 As shown, when projected axially, the projection surfaces of the abutment 103 and the stop pin 401 will partially overlap. Now let's look at... Figure 11 , 12 and combined Figure 14 , 15 understand, Figure 14 for Figure 2 A schematic diagram of the structure of the valve stem component 10 after it has been moved down a certain distance; Figure 15 for Figure 3 A schematic diagram of the structure of the middle valve stem component 10 after it has been moved down a certain distance.

[0081] The end face of the stop pin 401 facing the valve cavity 20a has a bevel 4011a, so that... Figure 3 From this perspective, after the valve stem component 10 moves downward a certain distance, it can reach... Figure 15 At this position, the abutment 103 will abut against the stop pin 401 axially. Under the action of external force F1, when the valve stem component 10 is in... Figure 15 As the valve stem continues to move downward, under the action of the inclined surface 4011a of the stop pin 401, the abutment part 103 generates a radial force F2 that pushes the stop pin 401. The stop pin 401 overcomes the force of the second elastic member 403 and moves away from the first cavity 23a. The second elastic member 403 is then compressed, and the abutment part 103 can move axially downward past the stop pin 401. The valve stem part 10 can then move downward to the position of the mating wall 20211, specifically to the upper part of the second cavity 202b of the second valve body part 202, so that the first sealing ring 1023 of its sealing part 102 can abut radially against the mating wall 20211, thereby closing the valve device 100. Figure 16 and Figure 17 As shown, Figure 16 for Figure 14 A schematic diagram of the structure of the valve stem component 10 after it has been moved down a certain distance. Figure 17 for Figure 15 A schematic diagram of the structure of the valve stem component 10 after it has been moved down a certain distance. Figure 16 , 17 When the valve device 100 is in the closed state, that is, in the second working state, the distance that the valve stem component 10 moves axially from the first working state to the second working state can be defined as the first distance.

[0082] It can be seen that the inclined surface 4011a of the stop pin 401 is limited to the interaction between the abutment part 103 and the abutment part 103, which pushes the stop pin 401 to make way, thereby passing over the stop pin 401. Obviously, the inclined surface 4011a is set facing the abutment part 103 upward. To achieve this purpose, the inclined surface can also be set on the abutment part 103, and the stop pin 401 can also be without an inclined surface. The angle α between the inclined surface 4011a and the radial direction can be between 45° and 65°. If the angle α is too small, it is easy to cause excessive self-locking and fail to meet the displacement requirements.

[0083] In addition, the valve device 100 in this embodiment also includes a limiting part 60, which can be further combined. Figure 4 Understand and refer to Figures 18 to 20 understand, Figure 18 for Figure 4A schematic diagram of the first valve body 201 without the limiting part 60 installed; Figure 19 for Figure 4 Schematic diagram of the middle limiting part 60; Figure 20 for Figure 19 Front view of the middle limit part 60.

[0084] In this embodiment, the limiting part 60 is a block structure independent of the valve body component 20. Exemplarily, the limiting part 60 includes a limiting base 602 and a limiting boss 601 protruding from one side surface of the limiting base 602. A peripheral wall of the limiting boss 601 includes a limiting surface 6011, a first guide surface 6012, and a second guide surface 6013 connected sequentially. The limiting surface 6011 of the limiting part 60 extends axially, and the first guide surface 6012 has a first end and a second end. In the second working state, the first end of the first guide surface 6012 is closer to the valve stem component 10. The first end of the first guide surface 6012 connects to the lower end of the limiting surface 6011 facing the second direction, and the second end connects to the second guide surface 6013. The first guide surface 6012 gradually extends upwards from the first end to the second end, i.e., it is an inclined surface overall, or it can be... Figure 20 As shown, it includes a straight surface with one end parallel to the radial direction and an upwardly inclined slope. The two ends of the second guide surface 6013 are the third end and the fourth end. In the second working state, the fourth end of the second guide surface 6013 is closer to the valve stem component 10. The third end of the second guide surface 6013 is connected to the second end of the first guide surface 6012. The fourth end of the second guide surface 6013 is connected to the upper end of the limiting surface 6011 facing the second direction. The second guide surface 6013 gradually extends from the third end to the fourth end from bottom to top. The inclination direction of the second guide surface 6013 is opposite to the inclination direction of the first guide surface 6012.

[0085] Let's look again. Figure 18 The first valve body 201 is provided with an installation groove 23c on the inner wall of the first cavity 23a. At least the limiting base 602 of the limiting part 60 can be embedded in the installation groove 23c, for example, pressed into the installation groove 23c. After installation, the limiting boss 601 of the limiting part 60 protrudes at least partially from the inner wall of the first valve body 201 in the radial direction.

[0086] like Figure 21 and Figure 22 As shown, Figure 21 for Figure 4 Enlarged schematic diagram of the middle limiting part at position 60; Figure 22 for Figure 18 Enlarged schematic diagram of the mounting slot 23c position.

[0087] The inner wall of the first valve body 201 is also provided with a first sliding groove 23b extending axially. A portion of the abutment portion 103 on the valve stem component 10 is inserted into the first sliding groove 23b and can slide axially along the first sliding groove 23b. The first sliding groove 23b can guide and limit the abutment portion 103. It can be seen that the first sliding groove 23b can be omitted.

[0088] The first groove 23b has a first side and a second side distributed circumferentially. The first groove 23b has a groove peripheral wall surrounding the groove opening. The definition of the groove peripheral wall of other grooves below can be understood by reference. The groove opening of the first groove 23b faces radially. The groove peripheral wall includes a groove top wall 232 and a first groove side wall 233 located on the first side and extending axially. The limiting boss 601 is located on the second side of the first groove 23b. The second side of the first groove 23b has no groove side wall at the position corresponding to the limiting boss 601 in the circumferential direction. The first groove 23b also has no groove side wall at the position corresponding to the position below the limiting boss 601. For example, the second side of the first groove 23b is designed as an open opening, or only a section of the second groove side wall 234 is provided on the second side. The second groove side wall 234 is also spaced apart from the limiting boss 601 in the axial direction to form a notch e.

[0089] The valve body component 20 has a reset surface 231, which is specifically disposed on the inner wall of the first valve body part 201. As mentioned above, when it is necessary to close the valve device 100, the valve stem component 10 will be driven to move downward along the axial direction. After passing the stop pin 401, it will be limited by the stop pin 401, thereby maintaining the second working state (the valve device 100 is in the closed state). The valve stem component 10 cannot move in the reverse direction to reopen the valve device 100. The function of the reset surface 231 is to reset the valve stem component 10 so as to reopen the valve device 100. The limiting part 60 can cooperate to reset.

[0090] Please continue to refer to this. Figure 23 and Figure 24 , Figure 23 for Figure 17 Sectional view along line AA in the middle; Figure 24 for Figure 23 Enlarged view of part B in the middle.

[0091] In the first working state, the abutment part 103 is located at the upper part of the first slide groove 23b and can abut against the top wall 232 of the groove axially. The valve stem component 10 moves down to... Figure 24After reaching the indicated position, the valve device 100 is in its second operating state. The abutment portion 103 moves down along the first slide groove 23b to a position below the stop pin 401. At this time, one side of the abutment portion 103 in the circumferential direction is stopped by the first groove sidewall 233 of the first slide groove 23b of the first valve body portion 201, and the other side of the abutment portion 103 in the circumferential direction is stopped by the limiting surface 6011 of the limiting boss 601. It can be seen that the limiting portion 60 and the first slide groove 23b can further limit the abutment portion 103, preventing the limiting portion 60 from twisting in the circumferential direction in the second operating state, and ensuring the reliability of the stop pin 401.

[0092] Let's look again. Figure 17 The valve device 100 also includes a first elastic member 50, which may also be a spring. The first elastic member 50 is used to provide the valve stem member 10 with an upward elastic force in the second direction. The lower end of the sealing part 102 is provided with a limiting boss 1022. The first elastic member 50 is located in the second cavity 202b of the second valve body part 202. One end of the first elastic member 50 is sleeved on the limiting boss 1022, and the other end abuts against the bottom wall of the second valve body part 202. Thus, when the valve stem component 10 moves down to seal the sealing part 102 and the mating wall 20211, the first elastic component 50 is pressed and generates an upward force on the valve stem component 10. The first elastic component 50 will press the valve stem component 10 against the stop pin 401. The first elastic component 50 and the stop pin 401 limit the valve stem component 10 in the axial direction. The limiting surface 6011 of the limiting boss 601 and the first groove sidewall 233 of the slide groove 23b limit the valve stem component 10 in the circumferential direction. Thus, the valve stem component 10 can maintain a stable closed valve state.

[0093] When it is necessary to reopen valve device 100, such as Figures 25 to 28 As shown, Figure 25 for Figure 16 A schematic diagram of the structure of the valve stem component 10 after it has been moved down a certain distance, which can be defined as the second distance; Figure 26 for Figure 17 A schematic diagram of the structure of the valve stem component 10 after it has been moved down a certain distance; Figure 27 for Figure 26 Schematic diagram of cross-section along the CC direction; Figure 28 for Figure 27 Enlarged view of part D in the middle. Figure 28 The path of the repositioning of the abutment 103 is indicated by a dashed arrow.

[0094] exist Figure 16 , 17 Based on this, continue to drive the valve stem assembly 10 to move downwards. Figure 25 , 26In this state, the valve stem component 10 will be misaligned axially and circumferentially with the first groove sidewall 233 of the first slide groove 23b and the limiting surface 6011 of the limiting boss 601. Therefore, the abutment portion 103 on the valve stem 101 will no longer be restricted by the first groove sidewall 233 and the limiting surface 6011. At this time, the valve stem component 10 can be rotated, and the abutment portion 103 can rotate at a preset angle to contact the first guide surface 6012. For example... Figure 28 As shown, the valve body component 20 can be provided with a stop surface 20212. When the abutment part 103 moves downward to abut against the stop surface 20212, the abutment part 103 moves down into place and can cooperate with the first guide surface 6012 when rotating. The setting of the stop surface 20212 makes the downward movement of the valve stem component 10 better controlled.

[0095] In addition, such as Figure 21 , 22 As shown in Figures 27 and 28, a portion of the peripheral wall of the mounting groove 23c used to install the limiting part 60 is the aforementioned reset surface 231. The reset surface 231 can be approximately perpendicular to the bottom wall of the mounting groove 23c, which can be an arc surface coaxial with the valve device 100. The reset surface 231 and the second guide surface 6013 of the limiting boss 601 are arranged opposite to each other, forming a first slide 100a between them. The reset surface 231 has a seventh end and an eighth end, with the eighth end closer to the first slide groove 23b. From the seventh end to the eighth end, it gradually tilts in a first direction, i.e., tilts upward, consistent with the tilting trend of the second guide surface 6013. The first slide 100a formed between them also maintains a synchronous tilting direction.

[0096] The abutment part 103 enters the end of the first slide 100a under the guidance of the first guide surface 6012. In fact, the inner wall of the first valve body 23 is also provided with a limiting surface 235 that is in contact with the reset surface 231. There is also a slide between the first guide surface 6012 and the limiting surface 235. Under the limiting guidance of the first guide surface 6012 and the limiting surface 235, the abutment part 103 enters the first slide 100a. As the valve stem component 10 is pushed upward by the elastic force of the first elastic component 50, the abutment part 103 will slide relative to the first slide rail 100a in the first slide rail 100a under the reaction force. In fact, the first slide rail 100a of the valve body component 20 remains stationary. Due to the inclined design of the first slide rail 100a, the valve stem component 10 will be forced to rotate in the opposite direction by a preset angle, so that the abutment part 103 slides over the first slide rail 100a and enters the first slide groove 23b. The second groove sidewall 234 and the limiting boss 601 are spaced apart, and the gap formed between them is the port of the first slide rail 100a. It can slide into the first slide groove 23b from this port. The position of sliding in is exactly the position of the abutment part 103 in the first slide groove 23b in the valve opening state, that is, the valve stem component 10 is reset and returns to the first working state. It can be seen that after the first elastic component 50 is set, when the valve stem component 10 rotates to the reset surface 231 at a preset angle, the external force is removed, and the first elastic component 50 will automatically push the valve stem component 10 to move along the reset surface 231 to reset, making the operation simpler. Of course, if the first elastic component 50 is not set, the valve stem component 10 can also be manually pulled to achieve reset.

[0097] In this embodiment, the purpose of the first guide surface 6012 is to guide the abutment 103 to be offset from the limiting surface 6011 of the limiting boss 601 in the circumferential direction, and to guide the abutment 103 to gradually enter the first slide rail 100a. The first guide surface 6012 may not be inclined upward from the first end to the second end, that is, it can be set without radial inclination. Inclined setting can guide the valve stem component 10 to move upward, shorten the stroke required for the valve stem component 10 to rise in the first slide rail 100a, reduce the length design of the first slide rail 100a, and also facilitate quick reset. Alternatively, the second groove sidewall 234 may not be provided, and the second side of the first slide rail 23b may be completely open, with the abutment 103 directly located at the top of the first slide rail 23b after sliding in.

[0098] Please refer to Figure 29 understand, Figure 29 for Figure 1 Top view of the central valve device 100.

[0099] In this embodiment, when the valve stem component 10 resets, it moves downward a certain distance from the second working state and then enters the third working state. At this time, the valve stem component 10 disengages from the circumferential stop and can rotate. When it rotates to the end of the first slide rail 100a and begins to reset, the rotation angle is... Figure 29 The preset angle shown can be set between 40° and 55°. Within this angle range, it is easy to operate and also helps to ensure the reliability of switching from the second tooling state to the third working state.

[0100] Please continue to refer to this. Figures 30 to 33 understand, Figure 30 This is a schematic diagram of the structure of the valve stem component 10 of the valve device 100 in another embodiment of this application; Figure 31 for Figure 20 Enlarged schematic diagram of part E in the middle; Figure 32 for Figure 31 A schematic diagram showing the positions of the abutment part 10111a and the reset surface 10112 in the valve stem component 10. Figure 33 for Figure 30 Front view of valve stem component 10.

[0101] This embodiment is based on the same principle as the above embodiment, except that the reset surface 10112 is set on the valve stem component 10, and the abutment part is no longer a limiting pin structure. Other structures are basically the same. The structure of the valve stem component 10 in this embodiment is described in detail below.

[0102] The valve stem guide portion 1011 of the valve stem component 10 is provided with a valve stem groove 1011b. A part of the valve stem groove 1011b is a second sliding groove 1011b1 extending axially. The second sliding groove 1011b1 has a bottom wall 10111. The bottom wall of the groove structure is the wall opposite to the groove opening. The bottom wall 10111 of the second sliding groove 1011b1 is also a wall extending axially. The bottom wall 10111 of the second sliding groove 1011b1 is provided with an abutment portion 10111a. Specifically, the bottom wall 10111 has a stepped surface. The stepped surface of the bottom wall 10111 is set upward, and the stepped surface is the abutment portion 10111a. The peripheral wall portion of the second slide groove 1011b1 includes an upper peripheral wall 10117 and a lower peripheral wall 10116, which are distributed vertically opposite to each other. The upper peripheral wall 10117 faces a first direction, and the lower peripheral wall 10116 faces a second direction. The peripheral wall portion of the second slide groove 1011b1 also includes a fourth groove side wall 10118 and a third groove side wall 10115, which are distributed circumferentially and arranged opposite to each other. The fourth groove side wall 10118 and the third groove side wall 10115 extend axially. One end of the stop pin 401 extending out of the first mounting hole 22a can be inserted into the second slide groove 1011b1.

[0103] Can be combined Figure 34 , 35 understand, Figure 34 This is a structural schematic diagram of the valve device 100 in another embodiment of this application, which is an axial cross-sectional view. At this time, the valve stem component 10 is in the first working state. Figure 35 for Figure 33 A structural schematic diagram of the central valve device 100 from another angle.

[0104] In the first working state of valve opening, the stop pin 401 is inserted into the second slide groove 1011b1 and located at the lower end of the second slide groove 1011b1. It can axially abut against the lower peripheral wall 10116 of the second slide groove 1011b1. Under the action of the second elastic member 403, the stop pin 401 also abuts radially against the bottom wall 10111 of the second slide groove 1011b1. When valve closing is required, the valve stem component 10 is driven downward to move. Relatively speaking, the stop pin 401 gradually moves upward towards the abutment part 10111a. After passing the abutment part 10111a, the stop pin 401 is located above the abutment part 10111a under the action of the second elastic member 403. At this time, it is in the second working state of valve closing. Since the stop pin 401 abuts downward against the abutment part 10111a, the valve stem 101 cannot move upward and remains in the closed state.

[0105] Continue to refer to Figure 31 , 32 The other part of the valve stem groove 1011b is a reset groove 1011b2, which is located on one side of the slide groove 1011b1 in the circumferential direction. The bottom wall of the reset groove 1011b2 and the third groove side wall 10115 of the slide groove 1011b1 are radially flush. The bottom wall of the reset groove 1011b2 is provided with a second slide rail 10a. The second slide rail 10a has an axially opposite upper slide rail wall 10114 and a lower slide rail wall. The lower slide rail wall serves as a third guide surface 10113, wherein the height of the third guide surface 10113 in the axial direction is higher than the height of the abutment part 10111a. The third groove side wall 10115 of the second slide groove 1011b1 has a notch 10115a (shown in...). Figure 33 The notch is also the port of the second slide 10a, which is connected to the slide groove 1011b1. When the stop pin 401 and the abutment part 10111a abut in the axial direction, the stop pin 401 is stopped on one side of the second slide groove 10118 in the circumferential direction and on the other side of the circumferential direction by the third groove side wall 10115. The valve stem component 10 remains stable relative to the stop pin 401, thus maintaining the valve in a closed position.

[0106] When the valve device 100 needs to be reopened, the valve stem component 10 can continue to be driven downward. In the closed state, there is a gap between the stop pin 401 and the circumferential wall 10117 of the slide groove 1011b1. When the valve stem component 10 continues to move downward, the stop pin 401 moves upward. After moving a certain distance, the stop pin 401 and the side wall 10115 of the third groove are offset in both the axial and circumferential directions. The stop pin 401 corresponds to the notch 10115a that connects the second slide 10a and the second slide groove 1011b1 in the circumferential direction, and is in the third working state. If the valve stem component 10 is rotated at a preset angle in this position, the stop pin 401 can slide into the second slide 10a and slide a certain distance along the second slide 10a.

[0107] like Figure 31 , 32 As shown, part of the peripheral wall of the reset groove 1011b2 is a reset surface 10112. The reset surface 10112 can be perpendicular to the plane containing the axis of the valve device 100. The two ends of the reset surface 10112 are the fifth end and the sixth end, respectively. The fifth end is the end that connects to the second slide rail 10a, and the sixth end is the end that connects to the lower peripheral wall 10116 of the lower end of the second slide groove 1011b1. When the stop pin 401 slides into the second slide rail 10a and reaches the fifth end of the reset surface 10112, it no longer... When a rotational force is applied, the valve stem component 10 tends to move upward under the action of the first elastic component 50. This, in turn, generates a downward reaction force on the stop pin 401. The stop pin 401 moves relative to the valve stem component 10 along the reset surface 10112, causing the valve stem component 10 to rotate in the opposite direction by a preset angle until the stop pin 401 slides into the lower end of the second slide groove 1011b1 and re-abuts against the lower peripheral wall 10116 of the slide groove, thus completing the reset of the valve stem component 10 and reopening the valve device 100. The preset angle setting in this embodiment can be the same as the angle setting in the above embodiments. Figure 32 As shown, the bottom wall of the reset groove 1011b2 also has a reset boss 10119. A slide is formed between a portion of the peripheral wall of the reset boss 10119 and the reset surface 10112 to guide the stop pin 401 to slide along the reset surface 10112, thereby causing the valve stem component 10 to reset.

[0108] in addition, Figure 34 , 35 In the embodiments, the valve body component 20 can be an integral structure. However, in the above embodiments, the limiting part 60, which performs limiting and guiding functions on the inner wall of the valve body component 20, increases the manufacturing difficulty. Therefore, the limiting part 60 is set independently, and the valve body component 20 is set as a split structure accordingly, facilitating the assembly of the independently set limiting part 60. Figure 34 , 35In this embodiment, the reset, guide, and limit structures are all set on the valve stem component 10. The valve stem component 10 can be machined on its outer surface, which is easy to achieve. In this case, the valve body component 20 does not need to be set as a split structure. Of course, it is also possible to set it as a split structure.

[0109] Of course, the limiting part 60 and the valve body component 20 can also be integrated. For example... Figure 36 The diagram shown is a structural schematic of the first valve body 201 of the valve device 100 in another embodiment of this application; Figure 37 for Figure 36 A cross-sectional view of the first valve body 201 along the axial direction. When the limiting part 60 and the valve body component 20 are integrally provided, the limiting part 60 can be machined on the inner wall surface of the first valve body 23 of the first valve body 201. A groove can be opened on the inner wall surface, and a protrusion has a center in the groove. In this way, a portion of the groove forms a mounting groove 23c, and the protrusion serves as a limiting boss 601. A first slide 100a is formed between the peripheral sidewall of the groove and the protrusion. Figure 36 , 37 The structure in can be compared Figure 4 , 5 Understanding, structural and Figure 4 , 5 The embodiments are basically the same, except that the limiting part 60 and the first valve body 23 are integrated into one structure. The specific working principle can be understood by referring to the above embodiments, and will not be repeated here.

[0110] Please continue to refer to 38. Figure 38 This is a schematic diagram of the gas system in an embodiment of this application.

[0111] The gas system includes a main gas circuit switch 200, a main gas pipe 300, branch gas pipes 400, a burner 500, and a control valve 600. The control valve is, for example, a stopcock valve. The main gas pipe 300 is equipped with the control valve 600, and each branch gas pipe 400 is connected to the main gas pipe 300 via the control valve 600, which controls the on / off state of the branch gas pipe 400 and the main gas pipe 300. Each branch gas pipe 400 is equipped with a corresponding burner 500, which supplies gas to the burner 500. The gas system includes gas-using equipment, such as an oven. The gas-using equipment has a control panel for controlling the gas flow (not shown in the figure). However, the main gas circuit switch 200 is often far from the control panel or is concealed. Therefore, if the control valve 600 fails, causing a gas leak or fire, it cannot be quickly shut off. The valve device 100 provided in the above embodiment can be installed on the main gas pipe 300, for example, by setting... Figure 38The A position is indicated and can be set on the control panel together with the control valve 600. The valve device 100 is small and convenient. The gas can be cut off in time by simply pressing the valve stem component 10. Compared with the control valve 600, the control of gas on and off is more convenient and effective, which helps to improve the safety factor.

[0112] Valve device 100 is set to a normally open state, that is, it is normally in the first working state. When a safety problem occurs due to control valve 600, the valve needle component 10 is pressed to put it into the second working state. Valve device 100 can also be equipped with an operation button connected to valve needle component 10. Pressing the operation button will close the gas path of valve device 100. After the safety problem is resolved, the operation button can be rotated to reset valve stem component 10 to the first working state. The operation button of control valve 600 is generally turned clockwise to close and counterclockwise to open. In this embodiment, the operation button of valve device 100 can be set to be the opposite of that of plug valve, that is, clockwise rotation will reset and open, so as to distinguish it from control valve 600.

[0113] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A valve device, characterized in that, The valve body assembly includes a valve body component (20), a valve stem component (10), and a stop pin assembly (40). The valve body component (20) is provided with a mating wall (20211). The valve stem component (10) includes a valve stem (101) and a sealing part (102). The valve stem (101) is provided with abutment parts (103, 10111a). The stop pin assembly (40) includes a stop pin (401). The stop pin assembly (40) is installed on the valve body component (20). The valve device (100) is in the first working state, the sealing part (102) is axially offset from the mating wall (20211), and the valve device (100) is open; The valve device (100) is in a second working state, and the sealing part (102) moves axially a first distance relative to the first working state, with the moving direction being a first direction. The sealing part (102) abuts against the mating wall (20211) radially to close the valve device (100). The abutting part (103, 10111a) abuts against the stop pin (401) in a second direction, with the first direction and the second direction being opposite. The valve device (100) is in a third working state, the sealing part (102) moves a second distance in a first direction relative to the second working state, and the abutment part (103, 10111a) and the stop pin (401) are axially offset; The valve body component (20) or the valve stem (101) has a reset surface. In the third working state, the valve stem component (10) is rotatable so that the abutment (103) contacts and engages with the reset surface (231) provided on the valve body component (20), or so that the stop pin (401) contacts and engages with the reset surface (10112) provided on the valve stem (101). The valve stem component (10) moves along the second direction to return to the first working state.

2. The valve device according to claim 1, characterized in that, The valve stem (101) is provided with the abutment (103), the abutment (103) is a limiting pin structure that protrudes radially along the valve stem (101), and either the abutment (103) or the stop pin (401) has a slope (4011a) facing the other.

3. The valve device according to claim 2, characterized in that, The reset surface (231) is disposed on the valve body component (20); the valve device (100) further includes a limiting part (60), the limiting part (60) includes a first guide surface (6012) and a second guide surface (6013); The first guide surface (6012) has a first end and a second end. In the second working state, the first end of the first guide surface (6012) is closer to the valve stem component (10). The second guide surface (6013) has a third end and a fourth end. In the second working state, the fourth end of the second guide surface (6013) is closer to the valve stem component (10). The second end of the first guide surface (6012) is connected to the third end of the second guide surface (6013). A first slide (100a) is formed between the second guide surface (6013) and the reset surface (231). A portion of the abutment (103) may be located within the first slide (100a). From the third end to the fourth end, the first slide (100a) gradually tilts towards the second direction.

4. The valve device according to claim 3, characterized in that, The first guide surface (6012) extends from the first end to the second end, and the first slide (100a) gradually tilts towards the second direction.

5. The valve device according to claim 3, characterized in that, The limiting part (60) further includes a limiting surface (6011), the first end of the first guide surface (6012) is connected to the end of the limiting surface (6011) facing the first direction, and the fourth end of the second guide surface (6013) is connected to the end of the limiting surface (6011) facing the second direction. The limiting surface (6011) extends axially, and in the second working state, the abutting part (103) abuts against the limiting surface (6011) on one side in the circumferential direction.

6. The valve device according to claim 5, characterized in that, The inner wall of the valve body component (20) is provided with a first slide groove (23b), and a portion of the abutment part (103) is inserted into the first slide groove (23b). The abutment part (103) can move axially along the first slide groove (23b). The first groove (23b) has a first groove sidewall (233), and in the second working state, the abutment (103) abuts against the first groove sidewall (233) on the other side in the circumferential direction.

7. The valve device according to claim 5, characterized in that, The limiting part (60) includes a limiting base (602) and a limiting boss (601) protruding from the limiting base (602). The limiting surface (6011), the first guide surface (6012) and the second guide surface (6013) are all part of the peripheral wall of the limiting boss (601). The valve body component (20) is provided with a mounting groove (23c), and at least the limiting base (602) of the limiting part (60) is embedded in the mounting groove (23c); or, the limiting part (60) and the valve body component (20) are integrally provided.

8. The valve device according to claim 7, characterized in that, The valve body component (20) includes a first valve body part (201) and a second valve body part (202), the first valve body part (201) and the second valve body part (202) are axially connected, the first valve body part (201) includes a first cavity (23a), the second valve body part (202) includes a second cavity (202b), the valve cavity (20a) of the valve body component (20) includes the first cavity (23a) and the second cavity (202b), the first cavity (23a) and the second cavity (202b) are axially connected; the mounting groove (23c) is disposed on the inner wall of the first valve body part (201) corresponding to the first cavity (23a).

9. The valve device according to claim 1, characterized in that, The outer peripheral wall of the valve stem (101) is provided with a stepped surface facing the second direction, and the stepped surface is the abutment part (10111a); the outer peripheral wall of the valve stem (101) also has the reset surface (10112).

10. The valve device according to claim 9, characterized in that, The reset surface (10112) has a fifth end and a sixth end, the sixth end being closer to the abutment (10111a); the reset surface (10112) gradually slopes toward the first direction from the fifth end to the sixth end.

11. The valve device according to claim 10, characterized in that, The outer peripheral wall of the valve stem (101) is also provided with a third guide surface (10113), which is connected to the fifth end of the reset surface (10112). In the third working state, the stop pin (401) can rotate along the third guide surface (10113) to the fifth end of the reset surface (10112).

12. The valve device according to claim 11, characterized in that, The valve stem (101) has a second groove (1011b1) on its outer peripheral wall. The abutment (10111a) is provided on the bottom wall (10111) of the second groove (1011b1). The groove peripheral wall of the second groove (1011b1) includes a third groove sidewall (10115) and a fourth groove sidewall (10118) that extend axially and are distributed opposite to each other in the circumferential direction. The third groove sidewall (10115) has a notch. In the second working state, one side of the stop pin (401) in the circumferential direction abuts against the side wall of the third groove (10115), and the other side abuts against the side wall of the fourth groove (10118). In the third working state, the stop pin (401) can slide across the notch to contact the third guide surface (10113).

13. The valve device according to claim 12, characterized in that, The valve stem (101) has a reset groove (1011b2) on its outer peripheral wall. A portion of the peripheral wall of the reset groove (1011b2) is the reset surface (10112), and the peripheral wall of the second slide groove (1011b1) includes a lower peripheral wall (10116) facing the second direction. The sixth end of the reset surface (10112) is connected to the lower peripheral wall (10116). The bottom wall of the reset groove (1011b2) has a stepped surface to form the third guide surface (10113). In the first working state, the stop pin (401) abuts radially against the bottom wall of the second slide groove (1011b1) and axially against the lower peripheral wall (10116) of the slide groove.

14. The valve device according to claim 13, characterized in that, The bottom wall of the reset groove (1011b2) has a second slide (10a), one end of the second slide (10a) is the notch, the second slide (10a) has a relatively distributed upper slide wall (10114) and lower slide wall, the lower slide wall is the third guide surface (10113).

15. The valve device according to any one of claims 1-14, characterized in that, The stop pin assembly (40) further includes a second elastic member (403) and a plug (402). The valve body component (20) has a mounting portion (22) with a mounting hole. One end of the mounting hole is connected to the valve cavity (20a) of the valve body component (20). The second elastic member (403) is located inside the mounting hole, and the plug (402) seals the other end of the mounting hole.

16. The valve device according to any one of claims 1-14, characterized in that, The valve device (100) includes a first elastic member (50) that provides elastic force to the valve stem member (10) in the second direction.

17. A gas system, characterized in that, The device includes a gas-using appliance and a main gas pipe (300) and branch gas pipes (400). The main gas pipe (300) is provided with a valve device (100) as described in any one of claims 1-16. The main gas pipe (300) is provided with a control valve (600). The branch gas pipes (400) are connected to the gas-using appliance. The gas-using appliance is provided with a control panel. The control valve (600) and the valve device (100) are both located on the control panel.

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