Self-holding type gas safety valve

Abstract

The utility model provides a self-holding gas safety valve, which can press a lifting rod, a valve plug and a spring of a valve group through the gravity of a ball when the safety valve is in a horizontal state, so that the valve group is kept open; when the ball rolls and displaces due to an earthquake or inclination, the spring synchronously pushes the valve plug and the lifting rod to displace so as to automatically seal the valve, and meanwhile, the ball is prevented from resetting after the lifting rod displaces, so that the valve group can be continuously sealed to ensure safety even if the safety valve is straightened to be in a horizontal state, and the safety valve group can be closed until a user confirms that no gas leaks. The lifting rod can be reset through the operation assembly, the ball automatically presses the lifting rod and the valve plug downwards to open the valve again, and therefore the problem that gas leakage cannot be completely prevented in the prior art is solved, and safety is effectively improved.

Description

Technical Field

[0001] The utility model relates to a safety valve which can automatically block gas when an earthquake or tilt occurs. After the safety valve is sealed, the valve can remain sealed even if it is straightened or restored to a horizontal state until it is confirmed that the disaster has been eliminated. The valve can then be simply opened through an operating component, thereby effectively improving safety. Background Art

[0002] In the known technologies related to gas equipment, such as safety valves such as JP3208726B2, JP3416415B2, JPH1089510A, and Taiwan Patent TW201823639A, the main function of which is to automatically block the gas in the event of an earthquake or tilt to prevent gas leakage.

[0003] The structure of such safety valves generally includes a ball placed in a recessed portion and a valve plug linked to the ball. Under normal use, the ball is automatically maintained at the center point of the recessed portion under the action of gravity, and the valve plug is maintained in an open state. When an earthquake occurs and causes the ball to roll and displace, the kinetic energy of the ball's movement can be used to drive the valve plug to displace and close the valve port.

[0004] In addition, known technologies such as JP3698858B2, JPH02166309A, Taiwan Patent TWI609146, JP3698861B2, etc. are designed to use the body to close the gas channel after the ball rolls and displaces, or use the pressure difference channel to open or the conductive terminal to trigger after the ball is displaced, so as to directly or indirectly block the flow of gas.

[0005] The above-mentioned safety valve structure, which uses the ball to automatically remain in a specific position at normal times and seal the valve by rolling the ball when an earthquake or tilt occurs, was discovered after long-term research by the creators of the present invention. When the earthquake stops or the safety valve is straightened and restored to a horizontal state, the ball will automatically roll back to its original position under the action of gravity, and the valve plug will automatically return to an open valve state.

[0006] At this time, if cracks have appeared in the gas equipment during the earthquake, or the pipeline has been pulled and detached, the known technology of automatically opening the valve to allow the gas to flow will cause the gas to continue to leak out from the cracks and cause harm. Obviously, there are still very serious deficiencies in safety.

[0007] In view of this, the inventors of the present invention have improved upon the major defect of the known technology that the valve automatically opens before safety is confirmed. After continuous research and testing, they have specially created a self-retaining gas safety valve that can effectively improve safety. Utility Model Content

[0008] The purpose of the utility model is to provide a self-holding gas safety valve, which can not only automatically close the valve and block the gas in the event of an earthquake or tilt, but also can continue to remain in the closed valve state even if the safety valve is straightened or restored to a horizontal state after closing the valve, until the user confirms that it is safe, and then can simply reopen the valve through an operating component, which can effectively overcome the major shortcomings of the known technology and improve safety and convenience of use.

[0009] To achieve the above-mentioned purpose, the utility model provides a self-holding gas safety valve, which comprises a valve body, an air intake cavity communicating between the inlet and the outlet of the gas passage, a valve group arranged below the air intake cavity, and an operating assembly arranged on the valve body; wherein the bottom surface of the air intake cavity has an arc surface or an inclined surface inclined downward, and a lower concave portion is formed at the lower point of the arc surface or the inclined surface, so that a ball can be automatically held in the concave portion in a horizontal state, and the utility model is characterized in that:

[0010] The valve assembly comprises a valve port connected between the air inlet cavity and the inlet, a valve plug capable of closing or moving away from the valve port, a lifting rod disposed above the valve plug, a spring elastically supported on the valve plug, and a push rod disposed below the valve plug; wherein the lifting rod can be pressed downward by the weight of the ball to move the valve plug away from the valve port to maintain the valve open state, and at the same time compress the spring;

[0011] The valve body tilts or vibrates so that the ball moves away from the concave portion on the arc surface or the inclined surface, and the elastic force of the spring pushes the valve plug to move and close the valve port to block the flow of gas, while the lifting rod moves synchronously to block the ball from returning to its original position, so that the valve plug can maintain the valve sealing state when it returns to a horizontal state; and

[0012] The operating assembly includes an operating button arranged on the outside of the valve body, and a transmission member extending from the operating button toward the lower push rod; the operating button and the transmission member can drive the lower push rod, the valve plug and the lifting rod to move downward to open the valve, and the ball can automatically move to the concave part through the arc surface or the inclined surface to press the lifting rod downward again when the horizontal state is restored to the horizontal state, thereby restoring the valve opening state.

[0013] By virtue of the above-mentioned structure, in addition to being able to automatically seal the valve and block the gas in the event of an earthquake or tilt, after the valve is closed, the lifting rod in the valve group is displaced to prevent the ball from resetting. Even after the safety valve is straightened or restored to a horizontal state, the valve plug can still maintain a sealed valve state to ensure that there is no possibility of gas leakage. The user can only simply reopen the valve through the operating component after confirming that it is safe, thereby effectively overcoming the major deficiencies of the known technology and improving safety and ease of use.

[0014] The implementation of each element is further described below:

[0015] During implementation, the valve body is provided with a accommodating space below the air inlet cavity, the bottom of which is connected to the inlet, the valve group is arranged in the accommodating space, the valve port is located at the top of the accommodating space, the operating button of the operating assembly is arranged on the outside of the valve body at a position relative to the accommodating space, and the transmission member extends to a position in the accommodating space relative to a push rod at the bottom of the valve group.

[0016] During implementation, the lifting rod and the lower push rod of the valve group are an integrally formed shaft rod, the shaft rod is arranged up and down in the accommodating space, and the valve plug is fixed on the shaft rod at a position relative to the lifting rod and the lower push rod, so that the valve plug can move up and down synchronously with the lifting rod and the lower push rod.

[0017] During implementation, the valve assembly further includes a spring pad fixed around the accommodating space, the spring pad is located below the valve plug, the bottom of the spring is arranged on the spring pad, and the top is elastically supported on the bottom of the valve plug.

[0018] During implementation, the valve port is provided with an upper shaft hole at the central position for the lifting rod to movably pass through, and the spring pad is provided with a lower shaft hole in the center for the lower push rod to movably pass through, so as to limit the coaxial displacement of the lifting rod, valve plug and lower push rod through the upper shaft hole and the lower shaft hole.

[0019] During implementation, the upper shaft hole is located at the center of the lower recess, so that the top end of the lifting rod is directly pressed down by the weight of the ball. When the ball moves away from the lower recess to cause the valve plug to move upward to close the valve port, the lifting rod simultaneously moves upward and protrudes from the lower recess to prevent the ball from returning to its original position.

[0020] During implementation, a limiting ring is provided on the lower push rod relative to the lower shaft hole, so as to limit the upward displacement distance of the lower push rod, the valve plug and the lifting rod through the limiting ring.

[0021] During implementation, the operating button of the operating component is a knob, the transmission member is a rotating rod with a hook at the end, and the lower push rod is provided with a lower push plate relative to the hook; when the lower push rod, the valve plug and the lifting rod are displaced upward to maintain the valve sealing state, the deflection of the knob can drive the rotating rod and the hook to press downward against the lower push plate, so that the lower push rod, the valve plug and the lifting rod are synchronously displaced downward to reopen the valve.

[0022] During implementation, the knob is provided with an arc-shaped notch, and the valve body is provided with a limiting protrusion relative to the arc-shaped notch, so that when the knob is deflected, it is limited to deflect within the range of the two ends of the arc-shaped notch respectively abutting against the limiting protrusion; and a torsion spring is provided on the knob or the rotating rod, so that the knob can automatically reset after deflection through the elastic force of the torsion spring.

[0023] During implementation, the operating button of the operating component is a push button, the transmission member is a pressure rod, and the lower push rod is provided with a rocker plate relative to the end of the pressure rod; when the lower push rod, the valve plug and the lifting rod are displaced upward and maintain the valve sealing state, the push button is pressed to cause the pressure rod to displace toward the rocker plate, and the pressure rod can press against the rocker plate to drive the lower push rod, the valve plug and the lifting rod to synchronously move downward to reopen the valve; and the operating component further includes a reset spring, which can provide an elastic force to reset the push button and the pressure rod after the push button is pressed.

[0024] Compared with the prior art, the present invention uses the design that the lifting rod can block the ball return after the valve is automatically sealed due to an earthquake or tilt, so that the safety valve can still maintain a tight sealing state after it is straightened and restored to a horizontal state, overcoming the major defect of the prior art that the gas continues to leak from the cracks due to the automatic return of the ball, effectively improving safety. In addition, the design of the operating component in the present invention can easily open the valve and restore the original safety function after the user confirms that it is safe, which is convenient to use.

[0025] Based on the technical means of the present invention, implementation methods suitable for the present invention are listed below and described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional exploded view of the utility model.

[0027] Figure 2 This is a schematic diagram (1) of the structure of the utility model in a normal use state.

[0028] Figure 3 It is a structural schematic diagram (2) of the utility model in a normal use state.

[0029] Figure 4 It is a schematic diagram of the action of the utility model to close the valve port during earthquake or tilt.

[0030] Figure 5 It is a schematic diagram of the utility model maintaining the valve sealing after the safety valve is straightened.

[0031] Figure 6 It is a schematic diagram of the action of reopening the valve by utilizing the operating assembly of the utility model.

[0032] Figure 7 It is a structural schematic diagram of another embodiment of the operating component in the utility model.

[0033] Figure 8 yes Figure 7 Schematic diagram of the position of the sealing valve in an embodiment during an earthquake or tilt.

[0034] Fig. 9 yes Figure 7 Schematic diagram of maintaining the valve seal after the embodiment is straightened.

[0035] Fig.10 yes Figure 7 Schematic diagram of the action of reopening the valve in the embodiment.

[0036] Explanation of the reference numerals: 100-valve body; 101-inlet; 102-outlet; 10-inlet cavity; 11-arc or inclined surface; 12-recessed portion; 13-ball; 20-valve group; 21-accommodating space; 22-valve port; 221-upper shaft hole; 23-valve plug; 24-lifting rod; 25-spring; 26-lower push rod; 261-limiting ring; 262-lower push plate; 263-rocker; 27-spring pad; 271-lower shaft hole; 28-shaft rod; 30-operating assembly; 31-operating button; 31a-knob; 311a-arc notch; 312a-limiting convex portion; 31b-pressing button; 32-transmission member; 32a-rotating rod; 321a-hook; 32b-pressing rod; 33a-torsion spring; 33b-reset spring. DETAILED DESCRIPTION

[0037] The utility model provides a self-holding gas safety valve that can automatically block gas in the event of an earthquake or tilt. The utility model has the characteristics that after the safety valve is automatically sealed, even if the safety valve is straightened and restored to a horizontal state, it can still remain in a sealed state to ensure that there is no possibility of gas leakage. The valve can only be opened simply when the user confirms that the disaster has been resolved, which can effectively improve safety. Please refer to the following description with accompanying drawings for its specific implementation.

[0038] like Figures 1 to 3 As shown, the self-holding gas safety valve of the utility model has a valve body 100 arranged on a gas device or a gas passage, and the valve body 100 is provided with an air intake cavity 10 between an inlet 101 and an outlet 102 connected to the gas passage, a valve group 20, and a group of operating components 30 arranged on the valve body. Among them:

[0039] The bottom surface of the air inlet chamber 10 has a downwardly inclined arc surface or inclined surface 11, and the lower point of the arc surface or inclined surface 11 forms a lower recess 12. A ball 13 is movably arranged on the lower recess 12, so that the ball 13 automatically remains in the position of the lower recess 12 when the safety valve is in a roughly horizontal state.

[0040] The valve group 20 is arranged in a accommodating space 21 whose bottom is connected to the inlet 101, and includes a valve port 22 located below the recessed portion 12 and connected to the air inlet chamber 10, a valve plug 23 located below the valve port 22, a lifting rod 24 arranged on the top of the valve plug 23 and extending upward, a spring 25 elastically supported below the valve plug 23, and a lower push rod 26 arranged below the valve plug 23.

[0041] During implementation, a spring pad 27 is further disposed around the accommodating space 21 and is located below the valve plug 23 . The bottom of the spring 25 is disposed on the spring pad 27 , so that the valve plug 23 can be supported by the spring 25 and close the valve port 22 upward.

[0042] In the accompanying drawings, the lifting rod 24 and the lower push rod 26 are an integrally formed shaft rod 28, and the shaft rod 28 is vertically penetrated in the accommodating space 21, and the valve plug 23 is fixed on the shaft rod 28 relative to the position between the lifting rod 24 and the lower push rod 26, so that the valve plug 23, the lifting rod 24 and the lower push rod 26 can be moved up and down synchronously.

[0043] Among them, after the lifting rod 24 is displaced upward, its top end can protrude from the aforementioned recessed portion 12; it must be explained here that in the accompanying drawings, the top end of the lifting rod 24 is located in the center of the recessed portion 12, and can directly receive the downward pressure of the ball 13 located in the recessed portion 12. In actual implementation, it is not ruled out that a linkage (not shown) is provided at the top end of the lifting rod 24, through which the lifting rod 24 can indirectly receive the downward pressure of the ball 13, so that the position of the lifting rod 24 can be designed according to the installation space without being restricted by the position of the recessed portion 12 and the ball 13.

[0044] In addition, in order to maintain the stability of the synchronous upward and downward displacement of the valve plug 23, the lifting rod 24 and the lower push rod 26, during implementation, the valve port 22 is provided with an upper shaft hole 221 at the central position for the top of the lifting rod 24 to movably pass through, and the spring pad 27 is provided with a lower shaft hole 271 in the center for the lower push rod 26 to movably pass through, so as to limit the coaxial upward and downward displacement of the lifting rod 24, the valve plug 23 and the lower push rod 26 through the upper shaft hole 221 and the lower shaft hole 271.

[0045] Furthermore, in conjunction with the implementation method in which the top end of the lifting rod 24 in the accompanying drawings is located in the center of the lower recess 12 to directly receive the downward pressure of the weight of the ball 13, the upper shaft hole 221 is also arranged at the center position of the lower recess 12, and the lower push rod 26 is provided with a limit ring 261 below the lower shaft hole 271 to limit the upward coaxial displacement distance of the lower push rod 26, the valve plug 23 and the lifting rod 24 through the limit ring 261.

[0046] Thus, when the safety valve is in normal use and maintained in a horizontal state, the top end of the lifting rod 24 can be pressed down by the weight of the ball 13, so that the valve plug 23 is away from the valve port 22 to maintain the valve open state, and at the same time, the spring 25 is compressed downward by the bottom of the valve plug 23, so that the spring 25 maintains a reverse elastic force. At this time, the gas can enter the air inlet chamber 10 from the inlet 101 through the accommodating space 21 and the valve port 22 in sequence, and then be released from the outlet 102 through the air inlet chamber 10.

[0047] Figure 4The schematic diagram of the safety valve of the utility model blocking the flow of gas when it is tilted due to an earthquake or other reasons is disclosed. As shown in the figure, when the valve body 100 is tilted or vibrated, the ball 13 rolls and moves on the arc surface or inclined surface 11 and leaves the concave portion 12, the top end of the lifting rod 24 loses the weight of the ball 13 and is pressed down. At this time, the elastic force of the spring 25 supports the valve plug 23, so that the valve plug 23 can move upward and close the valve port 22, blocking the flow of gas between the gas inlet 101 and the gas inlet chamber 10, thereby preventing gas leakage.

[0048] like Figure 4 and Figure 5 As shown, as mentioned above, while the spring 25 pushes upward against the valve plug 23 to close the valve port 22 and block the flow of gas, the lifting rod 24 moves upward synchronously with the valve plug 23, so that its top end protrudes from the lower recess 12 to prevent the ball 13 from automatically returning to its original position.

[0049] The purpose of resetting the blocking ball 13 is that after the safety valve automatically seals the valve plug due to an earthquake, when the earthquake ends or the safety valve is restored to a horizontal state due to human straightening, if there is no blocking ball, the ball will automatically return to its original position due to gravity and automatically open the valve to allow the gas to flow, causing the gas to continue to leak out from the cracks and cause harm.

[0050] To address this security vulnerability, Figure 5 As shown, when the lifting rod 24 of the safety valve of the utility model moves upward synchronously with the valve plug 23 to seal the valve, so that its top end protrudes from the lower recess 12, whether the safety valve is restored to a horizontal state due to the cessation of the earthquake or the user straightening it, the ball 13 cannot automatically return to the lower recess 12 due to the obstruction of the lifting rod 24, thereby ensuring that there is no possibility of gas leakage and improving safety.

[0051] See also Figures 1 to 3 The schematic diagram of the structure of the operating assembly 30 of the utility model is shown in the figure. As shown in the figure, the operating assembly 30 comprises an operating button 31 disposed outside the valve body 100, and a transmission member 32 extending from the operating button 31 toward the lower push rod 26 in the accommodating space 21, and the lower push rod 26 is provided with a lower push piece 262 relative to the hook portion.

[0052] In the drawings, the operating button 31 is a knob 31a, and the transmission member 32 is a rotating rod 32a, and the end of the rotating rod 32a has a hook portion 321a. Figures 1 to 3 In the normal use state shown, that is, the ball 13 is located in the lower recess 12 and presses the lifting rod 24 to make the valve plug 23 away from the valve port 22, the hook portion 321a is away from the lower push piece 262 of the lower push rod 26, and they are offset and do not interfere with each other.

[0053] like Figure 4 and Figure 5 As shown, when the safety valve is in an earthquake or tilt state, causing the ball 13, lifting rod 24, valve plug 23, and lower push rod 26 to move synchronously to seal the valve, the lower push piece 262 moves upward with the lower push rod 26 to approach the hook 321a at the end of the rotating rod 32a.

[0054] At this time, when the safety valve returns to a horizontal state and the user confirms that it is safe after inspection, Figure 6 As shown, rotating the knob 31a drives the rotating rod 32a and the hook portion 321a to rotate synchronously, and the hook portion 321a presses down the push-down sheet 262, so that the push-down rod 26, the valve plug 23 and the lifting rod 24 move downward synchronously.

[0055] The valve plug 23 moves downward away from the valve port 22 to reopen the valve, compressing the spring 25, and the top of the lifting rod 24 moves downward away from the lower concave portion 12. The ball 13 automatically returns to the lower concave portion 12 under the action of gravity because there is no obstruction from the lifting rod 24, and continues to press the lifting rod 24 downward by its weight to return to the position. Figure 2 and Figure 3 Normal use status shown.

[0056] In order to improve the convenience of returning to normal use, the implementation Figure 1 As shown, the knob 31a of the operating assembly 30 is provided with an arc-shaped notch 311a, and the valve body 100 is provided with a limiting protrusion 312a at a position relative to the arc-shaped notch 311a, so that when the knob 31a is deflected, it is limited to deflect within the range of the limiting protrusion 312a at both ends of the arc-shaped notch 311a.

[0057] In addition, the operating component 30 further includes a torsion spring 33a arranged on the knob 31a or the rotating rod 32a, so that the knob 31a, the rotating rod 32a and the hook portion 321a can automatically rotate in the opposite direction synchronously after deflection through the elastic force of the torsion spring 33a, so that the hook portion 321a can be moved away from the lower push plate 262 and restored to a normal use state in which they are offset and do not interfere with each other.

[0058] Figure 7 Another embodiment of the operating assembly 30 is disclosed. The operating button 31 of the operating assembly 30 is a push button 31b, the transmission member 32 is a pressure rod 32b, and the lower push rod 26 is provided with a rocker plate 263 at the end thereof relative to the pressure rod 32b.

[0059] Figure 8 , Fig. 9 The schematic diagram of the structure of this embodiment in the valve sealing state is disclosed. The actions and structural relationships of this embodiment when maintaining the valve sealing state are the same as those of the above-mentioned embodiment, especially Fig. 9As shown, when the earthquake stops or the user straightens the safety valve and restores the horizontal state, the ball 13 cannot automatically return to the lower recess 12 due to the obstruction of the lifting rod 24, thereby achieving the effect of improving safety, which is not further described here.

[0060] like Fig.10 As shown, when the operating component 30 moves upward when the lower push rod 26, the valve plug 23 and the lifting rod 24 move upward to maintain the valve sealing state, pressing the push button 31b causes the pressure rod 32b to move toward the rocker 263, and the pressure rod 32b can press against the rocker 263 to drive the lower push rod 26 to move downward, while driving the lifting rod 24 and the valve plug 23 to open the valve and restore the normal use state.

[0061] Similarly, in order to improve the convenience of returning to the normal use state, the operating assembly 30 of this embodiment further includes a return spring 33b, which can provide an elastic force to return the push button 31b and the pressure rod 32b to the normal state after the push button 31b is pressed, so that the safety valve returns to the normal state. Figure 7 Normal use status shown.

[0062] To sum up, when the safety valve of the utility model is maintained in a horizontal state during normal use, the lifting rod 24 can accept the weight of the ball 13 to press down, so that the valve plug 23 is away from the valve port 22 to maintain the valve open state. When an earthquake or tilt causes the ball 13 to be displaced, the spring 25 elastically supports the valve plug 23 to immediately seal the valve, and at the same time displaces the lifting rod 24 to prevent the ball 13 from returning to its original position. At this time, even if the safety valve is straightened or restored to a horizontal state, the valve plug 23 can still maintain a state of tightly closing the valve port 22, thereby ensuring that there is no risk of gas leakage and improving safety.

[0063] When the user or the gas company checks the gas equipment or pipeline and confirms that all conditions that may cause gas leakage have been eliminated, the user can easily reopen the valve through the operating component 30 to restore the safety valve to a normal use state, making the utility model easy to use.

[0064] The above embodiment descriptions and drawings only illustrate the preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model; any examples that are similar or identical to the purpose, structure, device, feature, etc. of the present utility model should fall within the patent scope of the present utility model.

Claims

1. A self-holding gas safety valve, the safety valve having a valve body, the valve body is provided with an air inlet cavity connecting the inlet and outlet of the gas channel, a valve group arranged below the air inlet cavity and a group of operating components arranged on the valve body; wherein, The bottom surface of the air inlet cavity has a downwardly inclined arc surface or inclined surface, and the lower point of the arc surface or inclined surface forms a lower concave portion, so that a ball can be automatically held in the lower concave portion in a horizontal state, and the characteristics are: The valve assembly comprises a valve port connected between the air inlet cavity and the inlet, a valve plug capable of closing or moving away from the valve port, a lifting rod arranged above the valve plug, a spring elastically supported on the valve plug, and a push rod arranged below the valve plug; wherein the top end of the lifting rod can be pressed downward by the weight of the ball, so that the valve plug moves away from the valve port to maintain the valve open state, and at the same time compresses the spring; The tilting or vibration of the valve body can cause the ball to move away from the concave portion on the arc surface or the inclined surface, and the elastic force of the spring can push the valve plug to move and close the valve port to block the flow of gas, while causing the lifting rod to move upward to block the ball from returning to its original position, so that the valve plug can restore to a horizontal state and keep sealing the valve; and The operating assembly includes an operating button arranged on the outside of the valve body, and a transmission member extending from the operating button toward the lower push rod; the operating button and the transmission member can drive the lower push rod, the valve plug and the lifting rod to move downward to open the valve, and the ball can automatically move to the concave part through the arc surface or the inclined surface to press the lifting rod downward again when the horizontal state is restored to the horizontal state, thereby restoring the valve opening state.

2. The self-holding gas safety valve according to claim 1, characterized in that: The valve body is provided with a accommodating space below the air inlet cavity, the bottom of which is connected to the inlet, the valve group is arranged in the accommodating space, the valve port is located at the top of the accommodating space, the operating button of the operating component is arranged outside the valve body at a position relative to the accommodating space, and the transmission member extends to a position in the accommodating space relative to a lower push rod at the bottom of the valve group.

3. The self-holding gas safety valve according to claim 2, characterized in that: The lifting rod and the lower push rod of the valve group are an integrally formed shaft rod, the shaft rod is arranged up and down in the accommodating space, and the valve plug is fixed on the shaft rod at a position relative to the lifting rod and the lower push rod, so that the valve plug can move up and down synchronously with the lifting rod and the lower push rod.

4. The self-holding gas safety valve according to claim 3, characterized in that: The valve assembly also includes a spring pad fixed around the accommodating space, the spring pad is located below the valve plug, the bottom of the spring is arranged on the spring pad, and the top of the spring is elastically supported on the bottom of the valve plug.

5. The self-holding gas safety valve according to claim 4, characterized in that: The valve port is provided with an upper shaft hole at the central position for the lifting rod to movably pass through, and the spring pad is provided with a lower shaft hole at the center for the lower push rod to movably pass through, so as to limit the coaxial displacement of the lifting rod, valve plug and lower push rod through the upper shaft hole and the lower shaft hole.

6. The self-holding gas safety valve according to claim 5, characterized in that: The upper shaft hole is located at the center of the lower recess, so that the top end of the lifting rod is directly pressed down by the weight of the ball. When the ball moves away from the lower recess to cause the valve plug to move upward to close the valve port, the lifting rod simultaneously moves upward and protrudes from the lower recess to prevent the ball from returning to its original position.

7. The self-holding gas safety valve according to claim 5, characterized in that: The lower push rod is provided with a limiting ring below the lower shaft hole, so as to limit the upward displacement distance of the lower push rod, the valve plug and the lifting rod through the limiting ring.

8. The self-holding gas safety valve according to any one of claims 1 to 7, characterized in that: The operating button of the operating component is a knob, the transmission part is a rotating rod with a hook at the end, and the lower push rod is provided with a lower push plate relative to the hook; when the lower push rod, the valve plug and the lifting rod are displaced upward to maintain the valve sealing state, the deflection of the knob can drive the rotating rod and the hook to press downward against the lower push plate, so that the lower push rod, the valve plug and the lifting rod are synchronously displaced downward to reopen the valve.

9. The self-holding gas safety valve according to claim 8, characterized in that: The knob is provided with an arc-shaped notch, and the valve body is provided with a limiting protrusion relative to the arc-shaped notch, so that when the knob is deflected, it is limited to deflect within the range of the limiting protrusions respectively abutting against the two ends of the arc-shaped notch; and the knob or the rotating rod is provided with a torsion spring, so that the knob is automatically reset after deflection through the elastic force of the torsion spring.

10. The self-holding gas safety valve according to any one of claims 1 to 6, characterized in that: The operating button of the operating component is a push button, the transmission part is a pressure rod, and the lower push rod is provided with a seesaw relative to the end of the pressure rod; when the lower push rod, the valve plug and the lifting rod are displaced upward and maintain the valve sealing state, the push button is pressed to cause the pressure rod to displace toward the seesaw, and the pressure rod can press against the seesaw to drive the lower push rod, the valve plug and the lifting rod to synchronously move downward to reopen the valve; and the operating component also includes a reset spring, which can provide an elastic force to reset the push button and the pressure rod after the push button is pressed.

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