Valve rod locking mechanism and emergency cut-off valve

Abstract

The utility model relates to the technical field of gas equipment valves, and particularly discloses a valve rod locking mechanism and an emergency cut-off valve, the valve rod locking mechanism comprises a valve rod and a locking assembly, the valve rod is provided with a clamping groove, the locking assembly comprises a sleeve and a clamping piece, the sleeve is provided with a hole channel penetrating through the side wall of the sleeve, the clamping piece is movably arranged in the hole channel in a penetrating mode, and the clamping piece is connected with the clamping groove. The valve rod is movably arranged in the sleeve in a penetrating mode, under the condition that the clamping groove corresponds to the hole channel, the clamping piece is configured to be clamped into the clamping groove under the action of external force, and the emergency cut-off valve comprises the valve rod locking mechanism. According to the scheme, a self-locking effect is formed by utilizing a geometric structure, the locking force is determined by an applied external force and a wedge-shaped angle, the clamping mode avoids the situation that a contact surface is seriously abraded due to repeated friction, meanwhile, the clamping mode does not depend on electric power or magnetic materials, stable locking can still be kept under the vibration, impact or extreme temperature environment, and the clamping mode is simple and reliable. And the situation that the valve rod is opened or closed by mistake is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas equipment valve technical field especially valve rod locking mechanism and emergency stop valve of a kind of. BACKGROUND

[0002] Electromagnetic cut-off valve, also known as electromagnetic valve or emergency stop valve, is an important fluid control equipment, mainly used for controlling the flow of medium in pipeline, which can quickly cut off fluid supply when needed to ensure the safe and stable operation of system.

[0003] The reliability of locking structure in electromagnetic cut-off valve directly determines the safety and service life of electromagnetic cut-off valve, especially in the working conditions of long pressure maintaining, high vibration or external impact. Currently, medium and small size industrial electromagnetic cut-off valves with diameter DN≤200mm mainly adopt two types of valve opening locking structures, one is copper pin bevel locking structure, and the other is permanent magnetic force locking structure. However, in the environment of frequent opening and closing or high load vibration, the repeated friction between copper pin and locking groove can easily cause wear on the contact surface, and the gap generated after wear can cause locking failure, which is manifested as drift of valve opening position or even accidental shutdown. The magnetic force provided by permanent magnetic force locking structure cannot be designed too large due to the limitations of coil power, volume, heating and other factors, so that the locking force in the open valve state is relatively small, and the anti-interference ability is limited, which can easily cause the risk of accidental valve closing. SUMMARY

[0004] The utility model discloses a kind of valve rod locking mechanism and emergency stop valve, to solve the above technical problems existing in related art.

[0005] To solve the above problems, the utility model adopts the following technical solutions:

[0006] In the first aspect, the application provides a valve rod locking mechanism, which comprises:

[0007] Valve rod, the valve rod is provided with a clamping groove;

[0008] Locking assembly, the locking assembly includes sleeve and clamping piece, the sleeve is provided with hole channel passing through the side wall of the sleeve, and the clamping piece is movably arranged in the hole channel;

[0009] The valve rod is movably arranged in the sleeve, and when the clamping groove corresponds to the hole channel, the clamping piece is configured to be clamped into the clamping groove under the action of external force.

[0010] In the second aspect, the application further provides an emergency stop valve, which comprises a housing, a static iron core, a moving iron core, a first elastic member, a second elastic member and the aforementioned valve rod locking mechanism; wherein:

[0011] The static iron core is fixed in the shell, and the dynamic iron core is slidably arranged in the shell, and the first elastic member is connected between the static iron core and the dynamic iron core;

[0012] The sleeve is connected and fixed with the static iron core, the valve rod is movably arranged through the static iron core and the dynamic iron core, the valve rod has an open state and a closed state, in the open state, the clamping groove corresponds to the hole, and the first elastic member is configured to apply an elastic force to the dynamic iron core, so that the dynamic iron core drives the clamping piece into the clamping groove;

[0013] The sealing disc is connected and arranged on the valve rod, and the second elastic member is connected with the sealing disc, in the case that the clamping piece is separated from the clamping groove, the second elastic member can drive the valve rod to switch from the open state to the closed state through the sealing disc.

[0014] The technical scheme adopted by the utility model can achieve the following beneficial effects:

[0015] The valve rod locking mechanism and the emergency shut-off valve of the application, the valve rod is movably arranged in the sleeve, in the case that the clamping groove on the valve rod corresponds to the hole, the clamping piece can be clamped into the clamping groove under the action of external force, so that the axial position of the valve rod is locked, the self-locking effect is formed by using geometric structure, the locking force is determined by the applied external force and the wedge angle, compared with the copper pin inclined plane locking structure, the clamping mode avoids the case that the contact surface is seriously worn due to repeated friction, and does not depend on electricity or magnetic material, and can still keep stable locking in vibration, impact or extreme temperature environment, when the valve rod locking mechanism is applied to the emergency shut-off valve, the stability of the valve rod in the open state or the closed state can be kept, the anti-interference ability of the emergency shut-off valve is enhanced, and the case that the valve rod is mistakenly opened or closed is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0017] Figure 1 It is the structure schematic view of the sleeve of the embodiment of the application;

[0018] Figure 2 It is the structure schematic view of the valve rod locking mechanism of the embodiment of the application;

[0019] Figure 3is Figure 2 a partial enlarged view of A in the figure;

[0020] Figure 4 is a structural schematic view of the emergency shut-off valve in the closed state according to an embodiment of the present application;

[0021] Figure 5 is Figure 4 a partial enlarged view of B in the figure;

[0022] Figure 6 is a structural schematic view of the moving iron core according to an embodiment of the present application;

[0023] Figure 7 is a cooperation schematic view of the moving iron core and the valve rod locking mechanism according to an embodiment of the present application;

[0024] Figure 8 is a structural schematic view of the emergency shut-off valve in the open state according to an embodiment of the present application;

[0025] Figure 9 is Figure 8 a partial enlarged view of C in the figure;

[0026] Figure 10 is a structural schematic view of the moving iron core according to an embodiment of the present application;

[0027] in the figure:

[0028] 100, valve rod; 110, clamping groove; 120, stop guiding surface; 200, locking assembly; 210, sleeve; 211, hole; 220, clamping piece; 300, shell; 400, static iron core; 500, moving iron core; 510, accommodating gap; 520, guiding surface; 530, locking surface; 600, first elastic piece; 700, second elastic piece; 800, valve cap; 900, coil. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0030] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the objects before and after are in an "or" relationship.

[0031] The valve rod locking mechanism and the emergency shut-off valve provided by the embodiments of the present application will be described in detail below in combination with the accompanying drawings. Figures 1 to 10 The valve rod locking mechanism and the emergency shut-off valve provided by the embodiments of the present application will be described in detail below in combination with the accompanying drawings.

[0032] Please refer to Figure 1 , Figure 2 and Figure 3 , the valve rod locking mechanism disclosed by the embodiments of the present application includes a valve rod 100 and a locking assembly 200, wherein the valve rod 100 is provided with a clamping groove 110, and the clamping groove 110 can be a wedge-shaped groove surrounding the valve rod 100, for example; the locking assembly 200 includes a sleeve 210 and a clamping piece 220, wherein the sleeve 210 is a basic component of the locking assembly 200 and can provide a mounting basis for the clamping piece 220, and specifically, the sleeve 210 is a tubular structure with through holes at both ends, the valve rod 100 is arranged in the sleeve 210, the sleeve 210 is provided with a hole 211 penetrating the side wall of the sleeve 210 in the radial direction, and the clamping piece 220 is movably arranged in the hole 211.

[0033] In the embodiments of the present application, the valve rod 100 is movably arranged in the sleeve 210, and when the clamping groove 110 on the valve rod 100 corresponds to the hole 211, the clamping piece 220 can be clamped into the clamping groove 110 under the action of an external force, thereby achieving the locking of the axial position of the valve rod 100. When the valve rod locking mechanism is applied to the emergency shut-off valve, the stability of the valve rod 100 in the open state or the closed state can be maintained, the anti-interference ability of the emergency shut-off valve is enhanced, and the situation of accidental opening or accidental closing of the valve rod 100 is avoided.

[0034] In some embodiments of the present application, the clamping piece 220 can be a spherical structure, and the diameter of the clamping piece 220 is greater than the wall thickness of the sleeve 210, so that the clamping piece 220 always has a part protruding from the outer wall or the inner wall of the sleeve 210. It can be understood that, in the case that the clamping piece 220 protrudes from the outer wall of the sleeve 210, the clamping piece 220 will move inward under the action of the external force and be clamped into the clamping groove 110, and in the case that the clamping piece 220 protrudes from the inner wall of the sleeve 210, the clamping piece 220 will move outward under the action of the internal force and be separated from the valve stem 100 to release the limit. The clamping piece 220 in a spherical structure can increase the smoothness of the movement of the clamping piece 220 in the hole 211.

[0035] In some embodiments of the present application, in the case that the clamping groove 110 is a wedge-shaped groove surrounding the valve stem 100, the clamping piece 220 can be at least two, and all the clamping pieces 220 are distributed along the circumference of the sleeve 210. For example, the clamping piece 220 can be three uniformly distributed along the circumference of the sleeve 210, and the sleeve 210 is correspondingly provided with three holes 211. On the one hand, by designing the clamping groove 110 as an annular structure, during the clamping locking process, the clamping piece 220 can be clamped into the clamping groove 110 after the valve stem 100 is axially moved into position, without the need for circumferential positioning of the clamping piece 220 and the clamping groove 110, thereby increasing the convenience of clamping of the two; on the other hand, by clamping the valve stem 100 with multiple clamping pieces 220 distributed in the circumference, the stability of the clamping force applied to the valve stem 100 by the locking assembly 200 can be increased.

[0036] Please refer to Figures 4 to 10The application further discloses an emergency shut-off valve, which comprises a shell 300, a static iron core 400, a dynamic iron core 500, a first elastic member 600, a second elastic member 700 and the valve rod locking mechanism. The shell 300 is a basic component of the emergency shut-off valve and can provide a mounting basis for the static iron core 400, the dynamic iron core 500, the first elastic member 600, the second elastic member 700 and the valve rod locking mechanism. Specifically, the shell 300 is a housing of an actuator of the emergency shut-off valve, and the shell 300 has a receiving cavity. The static iron core 400 is fixedly arranged in the shell 300, and the dynamic iron core 500 is slidingly arranged in the shell 300. Hollow channels are arranged on the static iron core 400 and the dynamic iron core 500. The valve rod 100 passes through the hollow channels of the static iron core 400 and the dynamic iron core 500. The valve rod 100, the static iron core 400 and the dynamic iron core 500 can be coaxially arranged. The first elastic member 600 is connected between the static iron core 400 and the dynamic iron core 500. For example, one end of the first elastic member 600 can abut against the static iron core 400 or a sleeve 210 arranged on the static iron core 400. The other end of the first elastic member 600 abuts against the dynamic iron core 500. The first elastic member 600 is configured to apply an elastic force to the dynamic iron core 500, so that the dynamic iron core 500 has a tendency to move away from the static iron core 400. It should be noted that, in the application, the shell 300 can be a basic component formed by assembling a plurality of components, and is not limited to a single component.

[0037] In the application, the sleeve 210 is fixedly connected with the static iron core 400. For example, the sleeve 210 can be a copper sleeve, which is assembled with the static iron core 400 in an embedded manner. For example, the valve rod 100, the sleeve 210, the static iron core 400 and the dynamic iron core 500 can be coaxially arranged. The valve rod 100 has an open state and a closed state. The valve rod 100 can move axially in the shell 300 to switch between the open state and the closed state. Specifically, in the open state, the clamping groove 110 on the valve rod 100 corresponds to the hole 211. The first elastic member 600 applies an elastic force to the dynamic iron core 500, so that the dynamic iron core 500 abuts against the clamping piece 220 and drives the clamping piece 220 into the clamping groove 110. At this time, the locking assembly 200 intervenes and plays a locking role on the valve rod 100 in the open state. The clamping piece 220 is embedded into the clamping groove 110 by the first elastic member 600. The self-locking effect is formed by the geometric structure. The locking force is determined by the first elastic member and the wedge angle. Compared with the copper pin inclined surface locking structure, the clamping manner avoids the situation that the contact surface is seriously worn due to repeated friction. Moreover, the clamping manner does not depend on electricity or magnetic materials and can still maintain stable locking in a vibration, impact or extreme temperature environment.

[0038] In the application, please refer to Figure 4 , Figure 5 ,Figure 8 and Figure 9 , the second elastic member 700 can drive the valve rod 100 to switch from the open state to the closed state. Specifically, the valve rod 100 is connected with a sealing disc. Exemplarily, the valve rod 100 and the sealing disc can be connected and fixed through a threaded connecting piece. One end of the second elastic member 700 is fixedly arranged, and the other end of the second elastic member 700 can be connected with the sealing disc. In the case that the clamping piece 220 and the clamping groove 110 are separated from each other, the second elastic member 700 can indirectly act on the valve rod 100 through the sealing disc and drive the valve rod 100 to switch from the open state to the closed state.

[0039] It can be understood that under the elastic action of the first elastic member 600, the moving iron core 500 abuts against the clamping piece 220 and drives the clamping piece 220 to enter the clamping groove 110. Therefore, in order to realize the switching of the valve rod 100 from the open state to the closed state, it is necessary to remove the abutting state of the moving iron core 500 on the clamping piece 220, so that the clamping piece 220 can be withdrawn from the clamping groove 110, and then the valve rod 100 can be switched to the closed state under the elastic driving of the second elastic member 700.

[0040] In some embodiments of the present application, please refer to Figure 3 , Figure 5 and Figure 9 , the emergency shut-off valve further comprises a valve cap 800 movably connected to the housing 300. Exemplarily, the valve cap 800 can be a cylindrical structure, and the valve rod 100 is movably arranged in the valve cap 800. A limiting step is arranged in the valve cap 800. When the valve rod 100 is in the closed state, the valve rod 100 is limited by the limiting step. When the valve rod 100 is switched from the closed state to the open state, the operator can lift the valve cap 800, and then drive the valve rod 100 to move axially and switch to the open state. It can be understood that when the valve rod 100 moves axially to the position corresponding to the open state, the clamping piece 220 can be automatically clamped into the clamping groove 110 under the action of the first elastic member 600, so that the valve rod 100 no longer moves. At this time, if the lifting force applied to the valve cap 800 is removed, the valve cap 800 can fall relative to the valve rod 100 under the action of gravity. Exemplarily, the valve cap 800 can freely fall to the state of being limited by the housing 300, or the valve cap 800 can freely fall to the state of being limited by the moving iron core 500.

[0041] From the foregoing, in order to realize the switching of the valve rod 100 from the open state to the closed state, the abutting state of the moving iron core 500 to the clamping piece 220 needs to be released. Based on this situation, in the embodiment of the application, the valve cap 800 is also configured to abut against the moving iron core 500 when subjected to a pressing force, so as to move the moving iron core 500 in the axial direction and compress the first elastic piece 600. After the moving iron core 500 moves in the axial direction, the abutting state of the moving iron core 500 to the clamping piece 220 is released. At this time, under the driving action of the second elastic piece 700, the valve rod 100 has a tendency to move in the axial direction. Since the clamping piece 220 lacks the constraint from the radial outside, the valve rod 100 can radially push the clamping piece 220 outward to separate the clamping piece 220 from the clamping groove 110. At this time, the valve rod 100 synchronously moves in the axial direction and switches to the closed state. That is to say, in addition to being able to lift the valve rod 100 to switch from the closed state to the open state, the valve cap 800 can also serve as a trigger for unlocking, by pressing the moving iron core 500 to move and release the locking effect of the locking assembly 200 to the valve rod 100, and has the characteristics of convenient operation.

[0042] From the foregoing, the moving iron core 500 is provided with a hollow passage that penetrates the moving iron core 500 in the axial direction, and the valve rod 100 is arranged in the hollow passage. Please refer to Figure 6 、 Figure 7 and Figure 10 The moving iron core 500 is also provided with a containing gap 510 that communicates with the hollow passage. In the case that the valve rod 100 is in the closed state, part of the clamping piece 220 is contained in the containing gap 510.

[0043] The moving iron core 500 has a guide surface 520 and a locking surface 530 that are connected at the far end of the containing gap 510. The locking surface 530 is located on the radial inside of the guide surface 520. In the process of switching the valve rod 100 from the closed state to the open state, the clamping groove 110 moves to a position corresponding to the hole 211. Since the clamping groove 110 provides a containing space for part of the clamping piece 220, the guide surface 520 pushes the clamping piece 220 to move radially inward until the outside of the clamping piece 220 abuts against the locking surface 530 and the inside of the clamping piece 220 abuts against the bottom wall of the clamping groove 110.

[0044] In the embodiment of the present application, the guide surface 520 has a first inclination angle a relative to the axial direction of the valve rod 100, the locking surface 530 has a second inclination angle β relative to the axial direction of the valve rod 100, and the first inclination angle a is greater than the second inclination angle β. For example, the first inclination angle a can be 45°, and the second inclination angle β can be 8°-30°. For example, the second inclination angle β can be 8°. In this way, under the elastic action of the first elastic member 600, the design of the first inclination angle a of 45° can enable the clamping piece 220 to move radially and smoothly enter the clamping groove 110, the design of the second inclination angle β of 8° can enable the moving iron core 500 to have a better blocking effect on the clamping piece 220 at the periphery of the hole 211, so as to avoid the clamping piece 220 from being radially separated from the clamping groove 110 and losing the locking effect under external impact or vibration. At the same time, the design of the second inclination angle β of 8° can provide a certain radial guiding effect when the valve rod 100 is actively controlled to switch from the open state to the closed state, so that the clamping piece 220 can retreat and be separated from the clamping groove 110.

[0045] In the embodiment of the present application, the clamping groove 110 can be a wedge-shaped groove, the width of the clamping groove 110 at its opening is greater than the width of the clamping groove 110 at its groove bottom. Specifically, the valve rod 100 is provided with a stop guide surface 120 on one side of the clamping groove 110. The stop guide surface 120 can be a wall surface of the proximal side wall of the clamping groove 110. When the valve rod 100 is in the open state, the clamping piece 220 abuts against the stop guide surface 120. During the switching process of the valve rod 100 from the open state to the closed state, the clamping piece 220 is in sliding cooperation or rolling cooperation with the stop guide surface 120, so as to be separated from the clamping groove 110.

[0046] In a further technical solution, the stop guide surface 120 has a third inclination angle γ relative to the axial direction of the valve rod 100, and the third inclination angle γ is 45°. In this way, after the pressing valve cap 800 is pressed to release the abutting force of the moving iron core 500 on the clamping piece 220, the design of the third inclination angle γ of 45° enables the clamping piece 220 to cooperate with the stop guide surface 120 to be separated from the clamping groove 110.

[0047] In the embodiment of the present application, the emergency shut-off valve further comprises a coil 900 arranged in the housing 300. When the coil 900 is energized, the static iron core 400 and the moving iron core 500 generate a magnetic force, so that the moving iron core 500 moves towards the static iron core 400 and is in contact with the static iron core 400. For example, when the coil 900 is energized, the static iron core 400 and the moving iron core 500 generate a magnetic attraction force, which is greater than the elastic force of the first elastic member 600. The moving iron core 500 moves towards the static iron core 400 to release the abutment on the clamping piece 220, so that the valve rod 100 can be switched from the open state to the closed state.

[0048] It should be noted that the terms "comprising," "including," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a... " does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element. Additionally, it should be noted that the scope of the methods and apparatus of the present embodiments are not limited by the order of the steps or the sequence for performing the steps, and can include performing the steps in different order, or substantially concurrently, or in reverse order, such as described, and can also include adding, omitting, or combining various steps. Additionally, features described in relation to certain examples can be combined in other examples.

[0049] The above description is merely that of the specific embodiments of the present application, but the scope of the present application is not limited thereto. It will be readily apparent to those skilled in the art that various changes and / or modifications can be made thereto without departing from the scope of the present application disclosed in the present application.

Claims

1. A valve stem locking mechanism, characterized in that, include: Valve stem (100), on which a slot (110) is provided; Locking assembly (200) includes a sleeve (210) and a snap-fit ​​member (220). The sleeve (210) has a channel (211) penetrating the side wall of the sleeve (210), and the snap-fit ​​member (220) is movably inserted into the channel (211). The valve stem (100) is movably inserted into the sleeve (210), and when the slot (110) corresponds to the channel (211), the snap-fit ​​(220) is configured to snap into the slot (110) when subjected to external force.

2. The valve stem locking mechanism according to claim 1, characterized in that, The slot (110) is arranged around the valve stem (100), and there are at least two snap-fit ​​members (220), and all the snap-fit ​​members (220) are distributed circumferentially along the sleeve (210).

3. The valve stem locking mechanism according to claim 1, characterized in that, The snap-fit ​​component (220) has a spherical structure.

4. An emergency shut-off valve, characterized in that, It includes a housing (300), a stationary iron core (400), a moving iron core (500), a first elastic element (600), a second elastic element (700), and a valve stem locking mechanism as described in any one of claims 1 to 3; wherein: The stationary iron core (400) is fixedly disposed inside the housing (300), the moving iron core (500) is slidably disposed inside the housing (300), and the first elastic element (600) is connected between the stationary iron core (400) and the moving iron core (500). The sleeve (210) is fixedly connected to the stationary iron core (400), and the valve stem (100) is movably inserted through the stationary iron core (400) and the moving iron core (500). The valve stem (100) has an open state and a closed state. In the open state, the slot (110) corresponds to the channel (211), and the first elastic member (600) is configured to apply an elastic force to the moving iron core (500), so that the moving iron core (500) pushes the snap-fit ​​member (220) into the slot (110). A sealing disc is connected to the valve stem (100), and the second elastic element (700) is connected to the sealing disc. When the snap-fit ​​element (220) is separated from the slot (110), the second elastic element (700) can drive the valve stem (100) to switch from the open state to the closed state through the sealing disc.

5. The emergency shut-off valve according to claim 4, characterized in that, It also includes a valve cap (800), which is movably connected to the housing (300). The valve stem (100) is movably inserted through the valve cap (800). A limiting step (810) is provided inside the valve cap (800). When the valve stem (100) is in the closed state, the valve stem (100) is limited and engaged with the limiting step (810). The valve cap (800) is configured to drive the valve stem (100) from the closed state to the open state when subjected to a lifting force.

6. The emergency shut-off valve according to claim 5, characterized in that, When the valve stem (100) is in the open state, the valve cap (800) is also configured to abut against the moving iron core (500) when subjected to a pressing force, causing the moving iron core (500) to move to remove the abutting force applied to the locking member (220). Under the elastic action of the second elastic member (700), the valve stem (100) pushes the locking member (220) to separate from the locking groove (110), and the valve stem (100) switches to the closed state.

7. The emergency shut-off valve according to claim 4, characterized in that, The moving iron core (500) is provided with a receiving gap (510). When the valve stem (100) is in the closed state, part of the snap-fit ​​member (220) is located in the receiving gap (510). The moving iron core (500) has a guide surface (520) and a locking surface (530) connected at the far end of the accommodating gap (510). The locking surface (530) is located radially inside the guide surface (520). During the process of the valve stem (100) switching from the closed state to the open state, the guide surface (520) and the locking surface (530) abut against the snap-fit ​​member (220) in sequence. The guide surface (520) has a first tilt angle α relative to the axial direction of the valve stem (100), and the locking surface (530) has a second tilt angle β relative to the axial direction of the valve stem (100). The first tilt angle α is greater than the second tilt angle β.

8. The emergency shut-off valve according to claim 4, characterized in that, The valve stem (100) is provided with a stop guide surface (120) on one side of the slot (110). The stop guide surface (120) is inclined relative to the axial direction of the valve stem (100). During the process of the valve stem (100) switching from the open state to the closed state, the snap-fit ​​member (220) slides with the stop guide surface (120).

9. The emergency shut-off valve according to claim 8, characterized in that, The stop guide surface (120) has a third tilt angle γ relative to the axial direction of the valve stem (100), and the third tilt angle γ is 45°.

10. The emergency shut-off valve according to claim 8, characterized in that, It also includes a coil (900) disposed inside the housing (300). When the coil (900) is energized, the stationary iron core (400) and the moving iron core (500) generate a magnetic force, causing the moving iron core (500) to move under the magnetic force and come into contact with the stationary iron core (400).

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