Liquefied fuel gas steel cylinder valve and using method thereof

Abstract

The invention provides a liquefied gas steel cylinder valve and a using method thereof and relates to the field of liquefied gas steel cylinder valves, a gas inlet cavity, a valve cavity, a valve element cavity and a gas outlet cavity are formed in a valve body, a valve element is arranged in the valve cavity, an overflowing self-closing assembly is arranged in the gas inlet cavity, a pin cavity is formed in the side face of the valve cavity, and the pin cavity is communicated with the valve cavity through a push rod channel; the front end of the pin cavity is communicated with the air inlet cavity through an inclined hole, a push rod is slidably arranged in the pin cavity in a sealed mode, the front end of the push rod is slidably connected into a push rod channel in a sealed mode, a gap is reserved between the front end of the push rod and the push rod channel, and in a normal state, the push rod is located at the right end of the pin cavity. According to the liquefied gas steel cylinder valve, the overflowing self-closing assembly is arranged in the gas inlet cavity, overflowing protection is achieved, closing is stopped or the closing state of the overflowing self-closing assembly is relieved through sliding fit of the push rod, and various application scenes of the valve are smoothly completed.

Description

Technical Field

[0001] The invention relates to the technical field of liquefied gas cylinder valves, in particular to a liquefied gas cylinder valve and a use method thereof. Background Art

[0002] According to the provisions of GB7512-2023 "Liquefied Petroleum Gas Cylinder Valve", in order to ensure the safety of liquefied gas cylinder valves, safety devices must be installed in liquefied petroleum gas cylinder valves (Note: In addition, in the standard clause 5.7, valves with flow self-closing are allowed to have no self-closing device at the outlet) to ensure that the gaseous channel of the liquefied gas cylinder valve does not leak. For this reason, the existing liquefied gas cylinder valves such as Figure 1 As shown, it includes a valve body 1'. The valve body 1' is formed with a gaseous channel, and the lower end of the gaseous channel is a bottle valve air inlet 2' for connecting a steel cylinder. A bottle valve air outlet 3' is arranged on the side of the valve body 1' for connecting a pressure reducing valve of the steel cylinder. A self-closing mechanism is installed in the bottle valve air outlet 3', so that the valve body 1' has a self-closing function, and gas can be discharged only after the pressure reducing valve is installed. However, after the self-closing mechanism is installed, the sealing surface 22' is greatly reduced, and the leakage points connected to the pressure reducing valve are increased. Although there is a double protection of the pressure reducing valve, due to the wide application of liquefied petroleum gas and a large number of customer groups, especially for the elderly, it is necessary to consider the situation that the pressure reducing valve is not detected or ignored during the gas leakage warning, and it only protects the leakage in the transportation and storage links, and has no protective effect in the gas use link. Therefore, the liquefied gas cylinder valve can be further improved to enhance the safety of the valve body.

[0003] To this end, this case proposes a new type of liquefied gas cylinder valve structure to solve the above-mentioned drawbacks. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a liquefied gas cylinder valve, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a liquefied gas cylinder valve, comprising a valve body, wherein an air inlet cavity, a valve cavity, a valve core cavity and an air outlet cavity are respectively formed in the valve body, the end of the air inlet cavity is a bottle valve air inlet connected to the cylinder, the end of the air outlet cavity is a bottle valve air outlet connected to the pressure reducing valve, a valve core is arranged in the valve cavity, which is used to open and close the valve port at the upper end of the valve cavity, an over-current self-closing component is arranged inside the air inlet cavity, and when the outlet flow rate of liquefied petroleum gas in the cylinder exceeds a threshold value, the over-current self-closing component closes the valve port at the lower end of the valve cavity;

[0008] A pin cavity is provided on the side of the valve cavity, the pin cavity is connected to the valve cavity through a push rod channel, the front end of the pin cavity is connected to the air intake cavity through an inclined hole, a push rod is sealingly and slidably arranged in the pin cavity, the front end of the push rod is sealingly and slidably connected in the push rod channel, and a gap is left between the front end of the push rod and the push rod channel. Under normal circumstances, the push rod is located at the right end of the pin cavity, and after the push rod is pushed inward, the closing state of the over-current self-closing component can be prevented or released.

[0009] Preferably, a threaded sleeve is fixedly provided on the inner side of the end of the pin cavity, and the push rod is slidably connected in the threaded sleeve.

[0010] Preferably, the push rod includes a front sliding section, a middle sliding section, and a rear sliding section. The rear sliding section is slidably connected in the screw sleeve, the middle sliding section slides on the inner wall of the pin cavity, and the front sliding section slides in the push rod channel. Sealing rings are respectively provided on the outer circles of the middle sliding section and the front sliding section.

[0011] Preferably, the over-current self-closing component includes a fixing part and a top shaft, gas flows on the fixing part, the fixing part is fixedly arranged on the inner wall of the air inlet chamber, the top shaft is slidably connected to the fixing part, a sealing block is sleeved on the upper end of the top shaft, and a spring is arranged between the top shaft and the fixing part, when the outlet flow rate of liquefied gas in the cylinder exceeds a threshold value, the sealing block moves upward with the top shaft to seal the valve port at the lower end of the valve chamber.

[0012] Preferably, the valve core includes a valve stem and an opening valve, the valve stem is engaged in the valve core cavity through a clamping nut, the valve stem and the opening valve are connected through a connecting block, a cushion block is provided under the opening valve, and a handwheel is provided on the valve stem. When the handwheel is turned, the valve stem drives the opening valve to move to open and close the valve.

[0013] Preferably, the gas outlet of the bottle valve is provided with an internal thread or an external thread.

[0014] A liquefied gas cylinder valve, the use method of the liquefied gas cylinder valve is as follows:

[0015] 1. Liquid or gas filled state Figure 2 As shown, the liquefied gas cylinder valve is in the valve inflation state: the cylinder valve outlet is connected to the inflation device, the hand wheel is rotated, the valve is opened, the inflation device inflates the cylinder through the valve body, the blocking block is forced downward by the air pressure, and the valve port at the lower end of the valve cavity remains connected, as shown in FIG. Figure 2 As shown by the arrow, the gas flows from the valve into the cylinder;

[0016] 2. After the cylinder is tested for air tightness with other gases, it is in the state of over-flow deflation or residual extraction. If over-flow deflation or residual extraction is required, such as Figure 3 As shown, the push rod is moved inward, the front end of the push rod is horizontal to the upper end of the top shaft, the air flows out from bottom to top, and the push rod blocks the self-closing component from closing;

[0017] 3. Close status as Figure 4 As shown, the cylinder valve air inlet of the valve body is sealed and connected to the cylinder through the cylinder valve special thread at the bottom of the valve, the valve port at the upper end of the valve cavity of the liquefied gas cylinder valve is in a closed state, an over-current self-closing open state (not triggered), and the push rod is at the right end;

[0018] 4. Normal use status is as follows Figure 5 As shown, the hand wheel is turned, and the hand wheel drives the valve stem to rotate on the travel screw, driving the connecting block and the opening valve to move upward, thereby opening the valve, and the air flows out of the cylinder and out of the air outlet cavity as shown by the arrow;

[0019] 5. The valve over-current self-closing state is as follows Figure 6 As shown, the valve port at the upper end of the valve cavity is in an open state. When the air flow exceeds the threshold, the air flow drives the blocking block to generate an upward thrust that exceeds the friction resistance of the spring and the blocking block and moves upward to block the valve port at the lower end of the valve cavity.

[0020] 6. The valve is released from the self-closing state. Figure 7 and Figure 8 As shown, first rotate the hand wheel to close the cylinder valve, push the push rod into the valve body, the sealing ring at the front end of the push rod is in a non-sealed state, and the gas in the bottle enters the valve cavity through the inclined hole and the push rod channel. When the pressure of the valve cavity and the air inlet cavity above and below the blocking block is balanced, the top shaft is reset by the spring force of the spring and returns to the position as shown in the figure. Fig. 9 In the state shown, the overcurrent self-closing component is reset;

[0021] 7. When it needs to be used again, first pull the push rod out to the right end position, then turn the hand wheel, open the cylinder valve, the valve can be used normally again, and the over-current self-closing component is in the untriggered state again.

[0022] (III) Beneficial effects

[0023] The present invention provides a liquefied gas cylinder valve. It has the following beneficial effects:

[0024] 1. The liquefied gas cylinder valve abandons the traditional self-closing mechanism of the valve body in the cylinder valve outlet. The self-closing mechanism is limited by the structure of the self-closing mechanism, that is, the matching form of the thread sleeve and the push rod. The thread sleeve and the pressure reducing valve interface have a small sealing surface, which increases the risk of liquefied petroleum gas leakage. At the same time, it only ensures the safety of transportation and storage. The safety device is set in the cylinder valve outlet. The sealing surface of the cylinder valve outlet and the pressure reducing valve interface is large, which improves the sealing of the connection between the cylinder valve outlet and the pressure reducing valve. At the same time, in the use and transportation of the gas cylinder, as long as the gas is discharged, When the flow exceeds the threshold, it can play a safety protection role. A pin cavity is opened on the side of the valve cavity. The pin cavity and the valve cavity are connected by a push rod channel. The front end of the pin cavity is connected to the air intake cavity through an inclined hole. A push rod is sealingly and slidingly arranged in the pin cavity. The front end of the push rod is sealingly and slidingly connected in the push rod channel, and a gap is left between the front end of the push rod and the push rod channel. Under normal circumstances, the push rod is located at the right end of the pin cavity. The sliding cooperation of the push rod can realize the prevention of closing or the release of the closed state of the over-current self-closing component, and successfully complete various applicable scenarios of the valve.

[0025] 2. The safety device of the liquefied gas cylinder valve is an overcurrent self-closing component, which includes a fixing part and a top shaft. The fixing part is fixedly arranged at the air inlet of the cylinder valve, and the top shaft is slidably connected to the fixing part. A spring is arranged between the top shaft and the fixing part. When the gas outlet flow rate of the liquefied gas in the cylinder exceeds a threshold value, the overcurrent self-closing component closes the valve to play an overcurrent protection role. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of an existing liquefied gas cylinder valve;

[0027] Figure 2 It is a schematic diagram of the structure of a liquefied gas cylinder valve in the liquid filling or gas filling state of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a liquefied gas cylinder valve of the present invention to release the over-current and over-limit discharge gas state; (a schematic diagram of the push rod working Figure 1 );

[0029] Figure 4 This is a schematic diagram of the structure of a liquefied gas cylinder valve in a closed state (the overcurrent self-closing component is not triggered);

[0030] Figure 5 This is a schematic structural diagram of a liquefied gas cylinder valve in normal use state according to the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of a liquefied gas cylinder valve in an overcurrent self-closing state of the present invention (the overcurrent self-closing component is triggered);

[0032] Figure 7 It is a structural schematic diagram of a liquefied gas cylinder valve of the present invention in the state of releasing the self-closing start;

[0033] Figure 8 for Figure 7 A magnified image of point A;

[0034] Fig. 9 It is a schematic diagram of the structure of the reset state of the overcurrent self-closing component of the liquefied gas cylinder valve of the present invention;

[0035] Fig.10 The present invention is a schematic structural diagram of a liquefied gas cylinder (liquefied dimethyl ether cylinder) in a valve closed state.

[0036] In the figure: 1. valve body; 2. bottle valve air inlet; 3. bottle valve air outlet; 4. air inlet chamber; 5. valve chamber; 6. valve core chamber; 7. air outlet chamber; 8. fixing piece; 9. top shaft; 10. blocking block; 11. spring; 12. pin chamber; 13. screw sleeve; 14. push rod; 141. front sliding section; 142. middle sliding section; 143. rear sliding section; 15. sealing ring; 16. valve stem; 17. opening valve; 18. connecting block; 19. spacer; 20. hand wheel; 21. push rod channel; 22. sealing surface; 23. thread below valve; 24. clamping nut; 25. screw sleeve; 26. push rod; 27. conical compression spring; 28. inclined hole. DETAILED DESCRIPTION

[0037] According to the provisions of GB / T 7512-2017 "Liquefied Petroleum Gas Cylinder Valve", in order to ensure the safety of liquefied gas cylinder valves, safety devices must be installed in liquefied gas cylinder valves to ensure that the gaseous channel of the liquefied gas cylinder valve does not leak. For this reason, the existing liquefied petroleum gas cylinder valves such as Figure 1 As shown, it includes a valve body 1', the valve body 1' is formed with a gaseous channel, the lower end of the gaseous channel is a bottle valve gas inlet 2', which is used to connect a steel cylinder, and the side of the valve body 1' is provided with a bottle valve gas outlet 3', which is used to connect the pressure reducing valve of the steel cylinder, and a self-closing mechanism is installed in the bottle valve gas outlet 3', so that the valve body 1' has a self-closing function, and gas can be discharged only when the pressure reducing valve is installed;

[0038] like Figure 1 As shown, the self-closing mechanism in the traditional valve body 1 includes a threaded sleeve 25 and a push rod 26. The threaded sleeve 25 is connected to the bottle valve outlet 3' and is sealed with an O-ring 15 and a sealing gasket. The push rod 26 is slidably connected to the threaded sleeve 25. A sealing seat is arranged at the rear end of the push rod 26, and a sealing seat cushion is arranged on the sealing seat. A conical compression spring 27 is arranged between the rear end of the sealing seat and the valve body 1'. After the valve air tightness test is qualified, the threaded sleeve 25 is punched and riveted, and copper chips are not allowed to enter the outlet. When the pressure reducing valve is not connected, the sealing seat cushion is stopped at the rear side of the threaded sleeve 25 under the elastic force of the conical compression spring 27, which is in a self-closing state. When the pressure reducing valve is connected, the push rod 26 is pushed back, the sealing seat cushion is separated from the side of the threaded sleeve 25, and the self-closing state is opened.

[0039] For example Figure 2 The sealing surface 22 is limited by the matching structure of the thread sleeve 25 and the push rod 26, such as Figure 1 The sealing surface 22 of the self-closing mechanism shown in the figure is greatly reduced, and the leakage point connected to the pressure reducing valve is increased. Although there is a double protection of the external pressure reducing valve, due to the wide application of liquefied petroleum gas and a large customer base, especially for the elderly, it is necessary to consider the situation that the pressure reducing valve leakage warning is not detected or ignored. Moreover, it is only for the protection of the transportation and storage links, and cannot be used for protection when the gas is used. Therefore, the present invention continues to improve the traditional liquefied gas cylinder valve and further improves the safety of the valve body 1'.

[0040] The embodiment of the present invention provides a liquefied gas cylinder valve, such as Figure 2-10 As shown, it includes a valve body 1, and an air flow channel is formed in the valve body 1, which is respectively composed of an air inlet chamber 4, a valve chamber 5, a valve core chamber 6 and an air outlet chamber 7. Blocking any chamber can achieve the effect of cutting off the air flow channel, so the traditional valve body 1 is provided with a safety device in the bottle valve outlet 3, which is changed to be provided in the bottle valve inlet 2, the end of the air inlet chamber 4 is the bottle valve inlet 2, which is connected to the steel cylinder, and the end of the air outlet chamber 7 is the bottle valve outlet 3, which is connected to the pressure reducing valve, and a valve core is provided in the valve chamber 5 for opening and closing the valve port at the upper end of the valve chamber 5. A safety device is provided inside the air inlet chamber 4. Judging from the nature, the safety device in this case is an over-current self-closing component. When the outlet flow rate of liquefied petroleum gas in the steel cylinder exceeds the threshold value, the over-current self-closing component closes the valve port at the lower end of the valve chamber 5;

[0041] A pin cavity 12 is provided on the side of the valve cavity 5, and the pin cavity 12 is connected to the valve cavity 5 through a push rod channel 21. The front end of the pin cavity 12 is connected to the air intake cavity 4 through an inclined hole 28. A push rod 14 is sealingly and slidably arranged in the pin cavity 12, and the front end of the push rod 14 is sealingly and slidably connected in the push rod channel 21, and a gap is left between the front end of the push rod 14 and the push rod channel 21. Under normal circumstances, the push rod 14 is located at the right end of the pin cavity 12. After the push rod 14 is pushed inward, the closing state of the over-current self-closing component can be prevented or released.

[0042] In the above technical solution, a threaded sleeve 13 is fixedly provided on the inner side of the end of the pin cavity 12 , and the push rod 14 is slidably connected in the threaded sleeve 13 .

[0043] Preferably, the push rod 14 includes a front sliding section 141, a middle sliding section 142, and a rear sliding section 143. The rear sliding section 143 is slidably connected in the screw sleeve 13, the middle sliding section 142 slides on the inner wall of the pin cavity 12, and the front sliding section 141 slides in the push rod channel 21. In order to improve the sealing performance of the pin cavity 12, the middle sliding section 142 and the front sliding section 141 are respectively provided with sealing rings 15 on their outer circles, and in particular, the rear sliding section 143 can be provided with a double-pass O-ring 15. Due to the setting of the stepped shaft of the push rod 14, the push rod 14 cannot be pushed outward.

[0044] Embodiment 1, the over-current self-closing component includes a fixing member 8 and a top shaft 9, gas flows on the fixing member 8, the fixing member 8 is fixedly arranged on the inner wall of the air inlet chamber 4, the function of the fixing member 8 is to fix the over-current self-closing component as a whole in the air inlet chamber 4, so the over-current self-closing component is installed as a whole, the top shaft 9 is slidably connected to the fixing member 8, the upper end of the top shaft 9 is sleeved with a blocking block 10, a spring 11 is arranged between the top shaft 9 and the fixing member 8, preferably, the fixing member 8 can be a screw sleeve 13, a threaded hole is opened in advance in the air inlet chamber 4, the outer circle of the screw sleeve 13 is connected to the threaded hole, and the top shaft 9 is provided with a conical surface at the upper end, the blocking block 10 is sleeved on the top shaft 9 at the lower end of the conical surface, and the blocking block 10 is fixed by a spring. When the outlet flow rate of liquefied petroleum gas in the cylinder exceeds the threshold value, the blocking block 10 moves upward with the top shaft 9 to block the valve port at the lower end of the valve chamber 5, and the blocking block 10 is preferably a sealing seat.

[0045] In the second embodiment, the valve core belongs to the prior art, and includes a valve stem 16 and an opening valve 17. The valve stem 16 is engaged in the valve core cavity 6 through a compression nut 24. The valve stem 16 and the opening valve 17 are connected through a connecting block 18. A cushion block 19 is provided under the opening valve 17. A hand wheel 20 is provided on the valve stem 16. When the hand wheel 20 is turned, the valve stem 16 drives the opening valve 17 to move to open and close the valve. The working principle is that the hand wheel 20 is turned, and the hand wheel 20 drives the valve stem 16 to rotate on the stroke screw, driving the connecting block 18 and the opening valve 17 to move up and down, thereby opening and closing the valve.

[0046] The liquefied gas cylinder valve is not limited to liquefied petroleum gas, but can also be used for liquefied dimethyl ether, etc. Figure 2-9 As shown in FIG. 1 , an internal thread is provided at the gas outlet of the liquefied petroleum gas cylinder valve, such as Fig.10 As shown, it is a schematic structural diagram of a liquefied dimethyl ether cylinder valve, wherein the gas outlet 3 of the cylinder valve is provided with an external thread.

[0047] Working principle: When the liquefied gas cylinder valve is used:

[0048] 1. Liquid or gas state Figure 2As shown, the liquefied gas cylinder valve is in the valve inflation state: the cylinder valve outlet 3 is connected to the inflation device, the hand wheel 20 is rotated, the valve is opened, the inflation device inflates the cylinder through the valve body 1, the blocking block 10 is forced downward under the action of air pressure, and the valve port at the lower end of the valve cavity 5 remains connected, as shown in FIG. Figure 2 As shown by the arrow, the air flows from the valve into the cylinder;

[0049] 2. After the cylinder is tested for air tightness with other gases, it is in the state of over-flow deflation or residual extraction. If it is necessary to deflate or extract the residual gas by over-flow, such as Figure 3 As shown, the push rod 14 is moved inward, the front end of the push rod 14 is horizontal on the upper end of the top shaft 9, the airflow flows out from the bottom to the top, and the push rod 14 blocks the closing of the self-closing component;

[0050] 3. Close status as Figure 4 As shown, the cylinder valve air inlet 2 of the valve body 1 is sealed and connected to the cylinder through the cylinder valve dedicated thread at the bottom of the valve, the valve port at the upper end of the valve cavity 5 of the liquefied gas cylinder valve is in a closed state, an over-current self-closing open state (not triggered), and the push rod 14 is at the right end;

[0051] 4. Normal use status is as follows Figure 5 As shown, the hand wheel 20 is turned, and the hand wheel 20 drives the valve stem 16 to rotate on the stroke screw, driving the connecting block 18 and the opening valve 17 to move upward, thereby opening the valve, and the air flows out of the cylinder and out of the air outlet cavity 7 as shown by the arrow.

[0052] 5. The valve over-current self-closing state is as follows Figure 6 As shown, the valve port at the upper end of the valve cavity 5 is in an open state. When the airflow exceeds the threshold value, the airflow drives the blocking block 10 to generate an upward thrust that exceeds the friction resistance of the spring 11 and the blocking block 10 and moves upward to block the valve port at the lower end of the valve cavity 5.

[0053] 6. The valve is released from the self-closing state. Figure 7 and Figure 8 As shown, first rotate the hand wheel 20 to close the cylinder valve, push the push rod 14 into the valve body 1, the sealing ring 15 at the front end of the push rod 14 is in a non-sealed state, and the gas in the bottle enters the valve cavity 5 through the inclined hole 28 and the push rod channel 21. When the pressure of the valve cavity 5 and the air inlet cavity 4 above and below the blocking block 10 is balanced, the top shaft 9 is reset by the spring force of the spring 11 and returns to the position as shown in FIG. Fig. 9 In the state shown, the overcurrent self-closing component is reset;

[0054] 7. When it is needed to be used again, first pull the push rod 14 out to the right end position, then turn the hand wheel 20, open the cylinder valve, and the valve can be used normally again, and the over-current self-closing component is in the untriggered state again.

[0055] In summary

[0056] 1. The liquefied gas cylinder valve abandons the self-closing mechanism of the traditional valve body 1 arranged in the bottle valve outlet 3. The self-closing mechanism is limited by the structure of the self-closing mechanism, that is, the matching form of the thread sleeve 25 and the push rod 26. The thread sleeve 25 and the pressure reducing valve interface sealing surface 22 are small, which increases the risk of liquefied petroleum gas leakage. The safety device is arranged in the bottle valve outlet 3, and the sealing surface 22 of the bottle valve outlet 3 and the pressure reducing valve interface is large, which improves the sealing performance of the connection between the bottle valve outlet 3 and the pressure reducing valve. At the same time, a pin cavity 12 is opened on the side of the valve cavity 5. The pin cavity 12 is connected to the valve cavity 5 through the push rod channel 21, and the front end of the pin cavity 12 is connected to the air inlet cavity 4 through the inclined hole 28. A push rod 14 is sealingly and slidingly arranged in the pin cavity 12, and the front end of the push rod 14 is sealingly and slidingly connected in the push rod channel 21, and a gap is left between the front end of the push rod 14 and the push rod channel 21. Under normal circumstances, the push rod 14 is located at the right end of the pin cavity 12, and the sliding cooperation of the push rod 14 is used to prevent closing or release the closed state of the over-current self-closing component, thereby successfully completing various applicable scenarios of the valve.

[0057] 2. The safety device of the liquefied gas cylinder valve is an overcurrent self-closing component, including a fixing part 8 and a top shaft 9. The fixing part 8 is fixedly arranged at the air inlet 2 of the cylinder valve, and the top shaft 9 is slidably connected to the fixing part 8. A spring 11 is arranged between the top shaft 9 and the fixing part 8. When the outlet flow rate of the liquefied petroleum gas in the cylinder exceeds the threshold, the overcurrent self-closing component closes the valve to play an overcurrent protection role.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquefied gas cylinder valve, comprising a valve body (1), wherein the valve body (1) is respectively formed with an air inlet cavity (4), a valve cavity (5), a valve core cavity (6) and an air outlet cavity (7), wherein the end of the air inlet cavity (4) is a cylinder valve air inlet (2) connected to the cylinder, and the end of the air outlet cavity (7) is a cylinder valve air outlet (3) connected to a pressure reducing valve, and a valve core is arranged in the valve cavity (5) for opening and closing the valve port at the upper end of the valve cavity (5), characterized in that: The air inlet cavity (4) is provided with an over-current self-closing component inside, and when the gas outlet flow rate of the liquefied gas in the cylinder exceeds a threshold value, the over-current self-closing component closes the valve port at the lower end of the valve cavity (5); A pin cavity (12) is provided on the side of the valve cavity (5), and the pin cavity (12) is connected to the valve cavity (5) through a push rod channel (21). The front end of the pin cavity (12) is connected to the air inlet cavity (4) through an inclined hole (28). A push rod (14) is sealingly slidably arranged in the pin cavity (12), and the front end of the push rod (14) is sealingly slidably connected in the push rod channel (21), and a gap is left between the front end of the push rod (14) and the push rod channel (21). Under normal conditions, the push rod (14) is located at the right end of the pin cavity (12). After the push rod (14) is pushed inward, the closing state of the over-current self-closing component can be prevented or released.

2. A liquefied gas cylinder valve according to claim 1, characterized in that: A screw sleeve (13) is fixedly arranged on the inner side of the end of the pin cavity (12), and the push rod (14) is slidably connected in the screw sleeve (13).

3. A liquefied gas cylinder valve according to claim 2, characterized in that: The push rod (14) comprises a front sliding section (141), a middle sliding section (142), and a rear sliding section (143); the rear sliding section (143) is slidably connected in the screw sleeve (13); the middle sliding section (142) slides on the inner wall of the pin cavity (12); the front sliding section (141) slides in the push rod channel (21); and sealing rings (15) are respectively arranged on the outer circles of the middle sliding section (142) and the front sliding section (141).

4. A liquefied gas cylinder valve according to claim 3, characterized in that: The over-current self-closing component comprises a fixing part (8) and a top shaft (9), gas flows on the fixing part (8), the fixing part (8) is fixedly arranged on the inner wall of the air inlet cavity (4), the top shaft (9) is slidably connected to the fixing part (8), a blocking block (10) is sleeved on the upper end of the top shaft (9), a spring (11) is arranged between the top shaft (9) and the fixing part (8), and when the gas outlet flow rate of the liquefied gas in the cylinder exceeds a threshold value, the blocking block (10) moves upward along with the top shaft (9) to block the valve port at the lower end of the valve cavity (5).

5. The liquefied gas cylinder valve according to claim 1, characterized in that: The valve core comprises a valve stem (16) and an opening valve (17). The valve stem (16) is engaged in the valve core cavity (6) through a clamping nut (24). The valve stem (16) and the opening valve (17) are connected through a connecting block (18). A cushion block (19) is provided under the opening valve (17). A hand wheel (20) is provided on the valve stem (16). When the hand wheel (20) is rotated, the valve stem (16) drives the opening valve (17) to move so as to open and close the valve.

6. A liquefied gas cylinder valve according to claim 1, characterized in that: The bottle valve gas outlet (3) is provided with an internal thread or an external thread.

7. According to claim 4, the liquefied gas cylinder valve is used as follows: 7.

1. Filling or gas state As shown in FIG2 , the liquefied gas cylinder valve is in the valve filling state: the cylinder valve outlet (3) is connected to the filling device, the hand wheel (20) is rotated, the valve is opened, the filling device fills the cylinder through the valve body (1), the blocking block (10) is forced downward under the action of air pressure, and the valve port at the lower end of the valve cavity (5) remains connected, as shown by the arrow in FIG2 , and the airflow flows from the valve into the cylinder; 7.

2. After the gas tightness test of the cylinder with other gases, when the cylinder is in the over-flow deflation state or the residual state, if the cylinder needs to be deflated or the residual is extracted, as shown in FIG3 , the push rod (14) is moved inward, and the front end of the push rod (14) is horizontal to the upper end of the top shaft (9), and the air flows out from the bottom to the top, and the push rod (14) blocks the closing of the self-closing component; 7.

3. The closed state is shown in FIG4 , the cylinder valve inlet (2) of the valve body (1) is sealed and connected to the cylinder through the dedicated cylinder valve thread at the bottom of the valve, the upper valve port of the valve cavity (5) of the liquefied gas cylinder valve is in the closed state, the over-current self-closing open state (not triggered), and the push rod (14) is at the right end; 7.

4. The normal use state is shown in FIG5. The hand wheel (20) is turned, and the hand wheel (20) drives the valve stem (16) to rotate on the travel screw, driving the connecting block (18) and the opening valve (17) to move upward, thereby opening the valve. As shown by the arrow, the air flows out of the cylinder and out of the air outlet cavity (7); 7.

5. The valve over-current self-closing state is shown in FIG6 . The valve port at the upper end of the valve cavity (5) is in an open state. When the air flow exceeds the threshold value, the air flow drives the blocking block to generate an upward thrust that exceeds the friction resistance of the spring (11) and the blocking block (10) and moves upward to block the valve port at the lower end of the valve cavity (5); 7.

6. The valve is released from the self-closing state as shown in Figures 7 and 8. First, the hand wheel (20) is rotated to close the cylinder valve, and the push rod is pushed into the valve body. The sealing ring at the front end of the push rod is in a non-sealed state. The gas in the bottle enters the valve cavity (5) through the inclined hole (28) and the push rod channel. When the pressure of the valve cavity and the air inlet cavity (4) above and below the blocking block is balanced, the top shaft (9) is reset by the spring force of the spring (11) and returns to the state shown in Figure 9. The over-current self-closing component is reset; 7.

7. When it is needed to be used again, first pull the push rod out to the right end position, then turn the hand wheel (20) to open the cylinder valve. The valve can be used normally again and the over-current self-closing component is in the untriggered state again.

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