Triple pressure reducing valve

Abstract

The utility model discloses a triple pressure reducing valve which comprises a first-stage pressure reducing mechanism, a second-stage pressure reducing mechanism, a third-stage pressure reducing mechanism, a first valve body, a second valve body, an air inlet rod, an air outlet rod and a connecting rod, the first-stage pressure reducing mechanism and the second-stage pressure reducing mechanism are both embedded in the first valve body, the first-stage pressure reducing mechanism is communicated with the second-stage pressure reducing mechanism, and the third-stage pressure reducing mechanism is communicated with the third-stage pressure reducing mechanism. The third-stage pressure reduction mechanism is embedded in the second valve body, the air inlet rod is provided with an air inlet hole and connected with the first valve body, the air inlet hole is communicated with the first-stage pressure reduction mechanism, one end of the connecting rod is connected with the first valve body, the other end of the connecting rod is connected with the second valve body, and the connecting rod is provided with a connecting hole. The second-stage pressure reducing mechanism and the third-stage pressure reducing mechanism are both communicated with the connecting hole, the air outlet rod is provided with an air outlet hole, the air outlet rod is connected with the second valve body, and the air outlet hole is communicated with the third-stage pressure reducing mechanism. According to the utility model, three-stage pressure reduction can be realized, large-amplitude pressure change use can be realized, and the airflow output stability can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of pressure reducing valve design, in particular to a triple pressure reducing valve. Background Art

[0002] A pressure reducing valve is a common device in welding processing. When taking gas from a high-pressure gas cylinder for welding, it is often necessary to reduce the pressure through a pressure reducing valve to effectively meet the requirements of safe production. Most traditional pressure reducing valves are single-stage pressure reducing, that is, high-pressure gas is output only after being reduced in pressure once. However, the gas converted by only one-time pressure reduction has poor stability and low reliability during welding.

[0003] In this regard, there are also pressure reducing valves on the market that can perform two-stage pressure reduction, such as a two-stage pressure reducing valve disclosed in CN107246491A. The two-stage pressure reducing valve can reduce the pressure of high-pressure gas twice before outputting, and the output gas is more stable and has stronger reliability during welding.

[0004] However, with the increasing upper limit of the gas pressure that can be stored in current high-pressure gas cylinders and the increasingly strict precision requirements for primary production and processing, the two-stage pressure reducing valve still has problems such as a very small difference, that is, a small pressure change range and weak adjustability, and it is difficult to meet more demanding processing requirements. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a triple pressure reducing valve that can solve one or more of the above problems.

[0006] According to one aspect of the utility model, a triple pressure reducing valve is provided, which includes a primary pressure reducing mechanism, a secondary pressure reducing mechanism, a tertiary pressure reducing mechanism, a first valve body, a second valve body, an intake rod, an outlet rod, and a connecting rod.

[0007] The primary pressure reducing mechanism and the secondary pressure reducing mechanism are both embedded in the first valve body, the primary pressure reducing mechanism is communicated with the secondary pressure reducing mechanism, and the tertiary pressure reducing mechanism is embedded in the second valve body.

[0008] The intake rod is provided with an intake hole, the intake rod is connected to the first valve body, and the intake hole is communicated with the primary pressure reducing mechanism.

[0009] One end of the connecting rod is connected to the first valve body, and the other end is connected to the second valve body. The connecting rod is provided with a connecting hole, and both the secondary pressure reducing mechanism and the tertiary pressure reducing mechanism are communicated with the connecting hole.

[0010] The outlet rod is provided with an outlet hole, the outlet rod is connected to the second valve body, and the outlet hole is communicated with the tertiary pressure reducing mechanism.

[0011] The beneficial effects of the present utility model are as follows: The present utility model can achieve three - stage decompression of high - pressure gas, can achieve a larger range of pressure variation for use, has strong adjustability, and can further improve the stability of the airflow output after pressure variation, so as to meet higher processing requirements.

[0012] In some embodiments, the primary decompression mechanism includes a first valve core, a piston, and a first spring. The primary decompression mechanism has a first chamber and a first air chamber in the first valve body. The first valve core is connected to the piston. The first valve core is movably disposed in the first air chamber, and the first valve core can seal the first air chamber. The piston is movably disposed in the first chamber. One end of the first spring is connected to the first valve body, and the other end is connected to the piston. Under normal conditions, the first spring can maintain the sealing of the first air chamber by the first valve core. When the first air chamber intakes air, it can push the piston to move, so that the first spring is stretched, and the first air chamber is opened. When the gas passes through the first air chamber, since the gas needs to overcome the pressure of the first spring, the gas can be effectively depressurized.

[0013] In some embodiments, the present utility model further includes a high - pressure gauge. The high - pressure gauge is installed on the first valve body. The first valve body is provided with a first air flow channel. One end of the first air flow channel is communicated with the first air chamber, and the other end is communicated with the high - pressure gauge. A part of the gas that needs to be input into the first air chamber will flow to the high - pressure gauge through the first air flow channel, so that the high - pressure gauge can effectively display the pressure of the input gas.

[0014] In some embodiments, the secondary decompression mechanism includes a second valve core, a second spring, a first pressing block, a first pressing film, a third spring, and a first adjusting screw. The secondary decompression mechanism has a second chamber, a third chamber, and a second air chamber in the first valve body. The second air chamber can be communicated with the second chamber, and the second air chamber is communicated with the third chamber. The second valve core is movably disposed in the second air chamber. One end of the second spring is connected to the first valve body, and the other end is connected to one side of the second valve core. The first pressing block is movably disposed in the third chamber, and the first pressing block can be connected to the other side of the second valve core. One end of the third spring is connected to the first pressing block, and the other end is connected to the first pressing film. The first adjusting screw is installed on the first valve body and is connected to the first pressing film. The second valve core can block the communication between the second air chamber and the second chamber.

[0015] Under normal conditions, under the action of the first pressing block, the second valve core will block the communication between the second air chamber and the second chamber. When the second chamber intakes air, it can push the second valve core to move, so that the third spring is compressed. Thus, the gas can enter the third chamber through the second air chamber and then be output. Since the gas needs to overcome the pressure of the third spring, the gas can be effectively depressurized.

[0016] In some embodiments, the three - stage pressure - reducing mechanism includes a third valve core, a fourth spring, a second pressure block, a second pressure film, a fifth spring, and a second adjusting screw. The three - stage pressure - reducing mechanism is provided with a fourth chamber, a fifth chamber, and a third air chamber in the second valve body. The third air chamber can communicate with the fourth chamber, and the third air chamber communicates with the fifth chamber. The third valve core is movably arranged in the third air chamber. One end of the fourth spring is connected to the second valve body, and the other end is connected to one side of the third valve core. The second pressure block is movably arranged in the fourth chamber and can be connected to the other side of the third valve core. One end of the fifth spring is connected to the second pressure block, and the other end is connected to the second pressure film. The second adjusting screw is installed on the second valve body and is connected to the second pressure film. The third valve core can block the communication between the third air chamber and the fourth chamber.

[0017] Under normal conditions, under the action of the second pressure block, the third valve core blocks the communication between the third air chamber and the fourth chamber. When the fourth chamber admits air, it can push the third valve core to move, so that the fifth spring is compressed, and thus the gas can enter the fifth chamber through the third air chamber and then be output. Since the gas needs to overcome the pressure of the fifth spring, the gas can be effectively depressurized.

[0018] In some embodiments, the present utility model further includes a low - pressure gauge. The low - pressure gauge is installed on the second valve body. The second valve body is provided with a second air flow passage and a third air flow passage. One end of the second air flow passage communicates with the fifth chamber, and the other end communicates with the low - pressure gauge. One end of the third air flow passage communicates with the air outlet hole, and the other end communicates with the low - pressure gauge. The gas after three - stage pressure reduction can be output after passing through the low - pressure gauge, so that the low - pressure gauge can effectively display the pressure of the output gas.

[0019] In some embodiments, the present utility model further includes a safety valve. The safety valve is installed on the first valve body, and the first - stage pressure - reducing mechanism is connected to the second - stage pressure - reducing mechanism through the safety valve. The safety valve can relieve the pressure of the gas whose pressure is still too high after the first - stage pressure reduction, avoiding damage to the subsequent mechanisms.

[0020] In some embodiments, the first valve body is provided with a plurality of fins. When the present utility model is in use, it is often necessary to connect a high - pressure gas cylinder. The gas in the high - pressure gas cylinder absorbs heat during the vaporization process, causing the phenomenon of water droplets hanging and slow gas outlet due to low temperature when the present utility model is in use. By providing fins, the first valve body can exchange heat with the outside faster, effectively reducing the probability of the above - mentioned phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the structural schematic diagram of a triple pressure - reducing valve according to an embodiment of the present utility model.

[0022] Figure 2Right view of the structural schematic diagram of a triple pressure reducing valve according to an embodiment of the present utility model.

[0023] Figure 3 is Figure 2 Cross-sectional view taken along line C-C of the structural schematic diagram of the triple pressure reducing valve of

[0024] Figure 4 is Figure 1 Cross-sectional view taken along line A-A of the structural schematic diagram of the triple pressure reducing valve of

[0025] Figure 5 is Figure 1 Cross-sectional view taken along line B-B of the structural schematic diagram of the triple pressure reducing valve of

[0026] In the figure: 1. Primary pressure reducing mechanism, 2. Secondary pressure reducing mechanism, 3. Tertiary pressure reducing mechanism, 4. First valve body, 5. Second valve body, 6. Intake rod, 7. Exhaust rod, 8. Connecting rod, 9. High pressure gauge, 10. Low pressure gauge, 20. Safety valve, 11. First valve core, 12. Piston, 13. First spring, 41. First chamber, 42. First air chamber, 43. Second chamber, 44. Third chamber, 45. Second air chamber, 46. Fin, 401. First air flow channel, 21. Second valve core, 22. Second spring, 23. First pressing block, 24. First pressing film, 25. Third spring, 26. First adjusting screw, 31. Third valve core, 32. Fourth spring, 33. Second pressing block, 34. Second pressing film, 35. Fifth spring, 36. Second adjusting screw, 51. Fourth chamber, 52. Fifth chamber, 53. Third air chamber, 501. Second air flow channel, 502. Third air flow channel, 61. Intake hole, 81. Connection hole, 71. Exhaust hole, 201. Safety valve body, 202. Stopper, 203. Sixth spring. Detailed implementation mode

[0027] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0028] Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , a triple pressure reducing valve of the present utility model includes a primary pressure reducing mechanism 1, a secondary pressure reducing mechanism 2, a tertiary pressure reducing mechanism 3, a first valve body 4, a second valve body 5, an intake rod 6, an exhaust rod 7 and a connecting rod 8.

[0029] The primary pressure reducing mechanism 1 is embedded in the first valve body 4.

[0030] Specifically, the first-stage decompression mechanism 1 includes a first valve core 11, a piston 12 and a first spring 13. The first-stage decompression mechanism 1 is provided with a first cavity 41 and a first air chamber 42 in the first valve body 4, one end of the first valve core 11 is integrally connected with the piston 12, the other end of the first valve core 11 is arranged in the first air chamber 42, the first valve core 11 is linearly movable in the first air chamber 42, the piston 12 is linearly movable in the first cavity 41, one end of the first spring 13 is connected to the first valve body 4, and the other end of the first spring 13 is connected to the piston 12.

[0031] Under normal conditions, under the elastic force of the first spring 13 , the first spring 13 can drive the piston 12 to move accordingly, and the first valve core 11 can close the first air chamber 42 .

[0032] The secondary pressure reducing mechanism 2 is also embedded in the first valve body 4 .

[0033] Specifically, the two-stage decompression mechanism 2 includes a second valve core 21, a second spring 22, a first pressure block 23, a first pressure film 24, a third spring 25 and a first adjusting screw 26. The two-stage decompression mechanism 2 is provided with a second cavity 43, a third cavity 44 and a second air chamber 45 in the first valve body 21. When not blocked, the second air chamber 45 can communicate with the second cavity 43, and the second air chamber 45 can communicate with the third cavity 44.

[0034] The second valve core 21 can be linearly moved in the second air chamber 45, and the two ends of the second valve core 21 extend from the two ends of the second air chamber 45 respectively, and the second spring 22 is arranged in the second cavity 43, one end of the second spring 22 abuts against the first valve body 4, and the other end of the second spring 22 abuts against one side of the second valve core 21.

[0035] The first pressure block 23 can be linearly moved in the third cavity 44, the first pressure block 23 can abut against the other side of the second valve core 21, and one end of the third spring 25 abuts against the first pressure block 23, and the other end of the third spring 25 abuts against the first pressure film 24, and the first adjusting screw 26 is installed on the first valve body 4 through threaded fitting, and the first adjusting screw 26 abuts against the first pressure film 24.

[0036] Normally, under the elastic force of the third spring 25, the third spring 25 can drive the movement of the first pressure block 23, so that the first pressure block 23 can press against the second valve core 21 so that the second valve core 21 presses against the opening of the second air chamber 45, so that the second valve core 21 can block the communication between the second air chamber 45 and the second cavity 43.

[0037] The three-stage pressure reducing mechanism 3 is embedded in the second valve body 5 .

[0038] Specifically, the three-stage decompression mechanism 3 includes a third valve core 31, a fourth spring 32, a second pressure block 33, a second pressure film 34, a fifth spring 35 and a second adjustment screw 36. The three-stage decompression mechanism 3 is provided with a fourth cavity 51, a fifth cavity 52 and a third air chamber 53 in the second valve body 5. When not blocked, the third air chamber 53 can be connected with the fourth cavity 51, and the third air chamber 53 is connected with the fifth cavity 52.

[0039] The third valve core 31 can be linearly moved in the third air chamber 53, and the two ends of the third valve core 31 extend from the two ends of the third air chamber 53 respectively, and the fourth spring 32 is arranged in the second cavity 43, one end of the fourth spring 32 abuts against the second valve body 5, and the other end of the fourth spring 32 abuts against one side of the third valve core 31.

[0040] The second pressing block 33 is disposed in the fourth chamber 51 so as to be linearly movable. The second pressing block 33 can abut against the other side of the third valve core 31.

[0041] One end of the fifth spring 35 abuts against the second pressure block 33, and the other end of the fifth spring 35 abuts against the second pressure film 34, and the second adjusting screw 36 is installed on the second valve body 5 through threaded matching, and the second adjusting screw 36 abuts against the first pressure film 24. The second adjusting screw 36 is also fixedly connected with an adjusting nut, so that the user can manually adjust the position of the second adjusting screw 36.

[0042] Normally, under the elastic force of the fifth spring 35, the fifth spring 35 can drive the movement of the second pressure block 33, so that the second pressure block 33 can press against the third valve core 31 so that the third valve core 31 presses against the opening of the third air chamber 53, so that the third valve core 31 can block the connection between the third air chamber 53 and the fourth cavity 51.

[0043] The air intake rod 6 is provided with an air intake hole 61, which is fixedly connected to the first valve body 4 through threaded fitting, and a channel is provided in the first valve body 4, through which the air intake hole 61 is connected to the first air chamber 42 of the first-stage decompression mechanism 1.

[0044] The triple pressure reducing valve also includes a high-pressure gauge 9, which is installed on the first valve body 4 by threaded fitting. A first air flow channel 401 is also provided in the first valve body 4. One end of the first air flow channel 401 is connected to the first air chamber 42, and the other end of the first air flow channel 401 is connected to the high-pressure gauge 9.

[0045] Other channels are also provided in the first valve body 4 , so that the first air chamber 42 of the first-stage decompression mechanism 1 can be connected with the second chamber 43 of the second-stage decompression mechanism 2 through the channels.

[0046] This triple pressure reducing valve can also include a safety valve 20. The safety valve 20 can include a safety valve body 201, a stop block 202, and a sixth spring 203. The safety valve body 201 is fixedly installed on the first valve body 4 through threaded fit. An exhaust cavity is provided in the safety valve body 201. The exhaust cavity is connected to the atmosphere. When the exhaust cavity is unobstructed, the channel connecting it to the first air chamber 42 of the primary pressure reducing mechanism 1 and the second chamber 43 of the secondary pressure reducing mechanism 2 is also connected. One end of the sixth spring 203 abuts against the stop block 202, and the other end of the sixth spring 203 abuts against the safety valve body 201. Under normal conditions, the stop block 202 can block the connection between the exhaust cavity and the above-mentioned channel under the action of the sixth spring 203.

[0047] One end of the connecting rod 8 is fixedly connected to the first valve body 4 by welding, and the other end of the connecting rod 8 is fixedly connected to the second valve body 5 by welding. A connecting hole 81 is provided in the connecting rod 8. The third chamber 44 of the secondary pressure reducing mechanism 2 and the fourth chamber 51 of the tertiary pressure reducing mechanism 3 are both connected to the connecting hole 81, that is, the third chamber and the fourth chamber 51 are connected through the connecting hole 81.

[0048] The air outlet rod 7 is provided with an air outlet hole 71. The air outlet rod 7 is fixedly connected to the second valve body 5 through threaded fit. The air outlet hole 71 can be connected to the fifth chamber 52 of the tertiary pressure reducing mechanism 3.

[0049] And this triple pressure reducing valve also includes a low-pressure gauge 10. The low-pressure gauge 10 is installed on the second valve body 5 through threaded fit. A second air flow channel 501 and a third air flow channel 502 are provided in the second valve body 5. One end of the second air flow channel 501 is connected to the fifth chamber 52, and the other end of the second air flow channel 501 is connected to the low-pressure gauge 10. One end of the third air flow channel 502 is connected to the air outlet hole 71, and the other end of the third air flow channel 502 is connected to the low-pressure gauge 10, that is, the air outlet hole 71 is connected to the fifth chamber 52 after passing through the low-pressure gauge 10.

[0050] In addition, a plurality of fins 46 are provided on the first valve body 4. The fins 46 are arranged adjacent to the primary pressure reducing mechanism 1 and the secondary pressure reducing mechanism 2. The fins 46 can preferably be made of materials with a fast heat exchange rate such as aluminum metal.

[0051] When this triple pressure reducing valve is in use, the air inlet rod 6 can be connected to an external high-pressure gas cylinder, and the air outlet rod 7 can be connected to an external welding device.

[0052] Under normal conditions, the first spring 13 can maintain the first valve core 11 to close the first air chamber 42. When the high-pressure gas cylinder inputs high-pressure gas into the air inlet hole 61, the high-pressure gas can enter the first air chamber 42 through the air inlet hole 61. The high-pressure gas can push the piston 12 to move, so that the first spring 13 is stretched, and the first valve core 11 can move with the movement of the piston 12. The first air chamber 42 is opened, so that the gas can flow through the first air chamber 42 and then enter the second chamber 43 of the secondary pressure reducing mechanism 2. When the gas passes through the first air chamber 42, since the gas needs to overcome the pressure of the first spring 13, the gas can be depressurized for the first time by the primary pressure reducing mechanism 1.

[0053] In addition, a part of the gas input into the first air chamber 42 will flow to the high-pressure gauge 9 through the first gas flow channel 401, so that the high-pressure gauge 9 can effectively display the pressure of the input gas.

[0054] The gas that enters the second chamber 43 of the secondary pressure reducing mechanism 2 can push the second valve core 21 to move, so that the second chamber 43 and the second air chamber 45 become connected. Correspondingly, the first pressing block 23 can move with the movement of the second valve core 21, then the third spring 25 is compressed, and the gas can enter the second air chamber 45 from the second chamber 43, and then enter the third chamber 44 from the second air chamber 45, and then flow to the connection hole 81. When the gas passes through the second air chamber 45, since the gas needs to overcome the pressure of the third spring 25, the gas can be depressurized for the second time by the secondary pressure reducing mechanism 2.

[0055] The gas can enter the fourth chamber 51 of the tertiary pressure reducing mechanism 3 through the connection hole 81. The gas that enters the fourth chamber 51 can push the third valve core 31 to move, so that the fourth chamber 51 and the third air chamber 53 become connected. Correspondingly, the second pressing block 33 can move with the movement of the third valve core 31, then the fifth spring 35 is compressed, and the gas can enter the third air chamber 53 from the fourth chamber 51, and then enter the fifth chamber 52 from the third air chamber 53. When the gas passes through the third air chamber 53, since the gas needs to overcome the pressure of the fifth spring 35, the gas can be depressurized for the third time by the tertiary pressure reducing mechanism 3.

[0056] Finally, the gas that has been depressurized three times can flow into the low-pressure gauge 10 from the fifth chamber 52 through the second gas flow channel 501, so that the low-pressure gauge 10 can effectively display the pressure of the gas after being depressurized three times. Then the gas flows to the air outlet hole 71 through the third gas flow channel 502 and is output for use by the welding equipment.

[0057] In addition, the gas that has undergone the first pressure reduction will flow through the safety valve 20. If the gas pressure is too high at this time, the gas pressure will push open the block 202, and the sixth spring 203 will be compressed. Then, the over-high-pressure gas can be discharged into the atmosphere through the exhaust cavity to ensure safety until the gas pressure meets the safety requirements, that is, the air pressure is not sufficient to push open the block 202. The sixth spring 203 relies on its elastic force to make the block 202 resume blocking the exhaust cavity and the passage in the first valve body 4, and then the high-pressure gas is no longer discharged.

[0058] When this triple pressure reducing valve is actually used, the piston 12 and the first adjusting screw 26 can be preset before leaving the factory. And the user can directly adjust the outlet pressure by rotating the nut connected to the second adjusting screw 36. The adjustment is convenient. And because three-stage pressure reduction is used, it can achieve a large range of pressure variation in use, has strong adjustability, and can further improve the stability of the gas flow output after pressure variation to meet higher processing requirements.

[0059] On the other hand, since the gas in the high-pressure gas cylinder will absorb heat during the vaporization process during actual use, the triple pressure reducing valve will show phenomena such as water droplets hanging due to low temperature and slow gas outlet during use. By setting the fins 46, the first valve body 4 can exchange heat with the outside world faster, so as to effectively reduce the probability of the above phenomena occurring.

[0060] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. Triple pressure reducing valve, characterized in that: It includes a first-stage pressure reducing mechanism, a second-stage pressure reducing mechanism, a third-stage pressure reducing mechanism, a first valve body, a second valve body, an air inlet rod, an air outlet rod and a connecting rod. The first-stage pressure relief mechanism and the second-stage pressure relief mechanism are both embedded in the first valve body, the first-stage pressure relief mechanism is connected to the second-stage pressure relief mechanism, and the third-stage pressure relief mechanism is embedded in the second valve body. The air intake rod is provided with an air intake hole, the air intake rod is connected to the first valve body, and the air intake hole is connected to the first-stage pressure reducing mechanism. One end of the connecting rod is connected to the first valve body, and the other end is connected to the second valve body. The connecting rod is provided with a connecting hole, and the secondary pressure reducing mechanism and the tertiary pressure reducing mechanism are both connected to the connecting hole. The air outlet rod is provided with an air outlet hole, the air outlet rod is connected to the second valve body, and the air outlet hole is communicated with the three-stage decompression mechanism.

2. The triple pressure reducing valve according to claim 1, characterized in that: The primary pressure reducing mechanism comprises a first valve core, a piston and a first spring. The first-stage pressure reducing mechanism is provided with a first cavity and a first air chamber in the first valve body. The first valve core is connected to the piston, and the first valve core is movably disposed in the first air chamber. The first valve core can close the first air chamber. The piston is movably disposed in the first cavity. One end of the first spring is connected to the first valve body, and the other end is connected to the piston.

3. The triple pressure reducing valve according to claim 2, characterized in that: It comprises a high-pressure gauge, which is installed on a first valve body. The first valve body is provided with a first air flow channel, one end of the first air flow channel is connected to the first air chamber, and the other end is connected to the high-pressure gauge.

4. The triple pressure reducing valve according to claim 1, characterized in that: The two-stage pressure reducing mechanism comprises a second valve core, a second spring, a first pressure block, a first pressure film, a third spring and a first adjusting screw. The secondary pressure reducing mechanism is provided with a second chamber, a third chamber and a second air chamber in the first valve body. The second air chamber can be connected to the second cavity, and the second air chamber is connected to the third cavity. The second valve core is movably disposed in the second air chamber, one end of the second spring is connected to the first valve body, and the other end is connected to one side of the second valve core. The first pressure block is movably arranged in the third cavity, the first pressure block can be connected to the other side of the second valve core, one end of the third spring is connected to the first pressure block, and the other end is connected to the first pressure membrane, the first adjusting screw is installed on the first valve body and connected to the first pressure membrane, and the second valve core can block the communication between the second air chamber and the second cavity.

5. The triple pressure reducing valve according to claim 1, characterized in that: The three-stage pressure reducing mechanism comprises a third valve core, a fourth spring, a second pressure block, a second pressure film, a fifth spring and a second adjusting screw. The three-stage pressure reducing mechanism is provided with a fourth chamber, a fifth chamber and a third air chamber in the second valve body. The third air chamber can be connected to the fourth chamber, and the third air chamber is connected to the fifth chamber. The third valve core is movably disposed in the third air chamber, one end of the fourth spring is connected to the second valve body, and the other end is connected to one side of the third valve core. The second pressure block is movably arranged in the fourth cavity, the second pressure block can be connected to the other side of the third valve core, one end of the fifth spring is connected to the second pressure block, and the other end is connected to the second pressure membrane, the second adjusting screw is installed on the second valve body and connected to the second pressure membrane, and the third valve core can block the communication between the third air chamber and the fourth cavity.

6. The triple pressure reducing valve according to claim 1, characterized in that: It includes a low-pressure gauge, which is installed on the second valve body. The second valve body is provided with a second air flow channel and a third air flow channel. One end of the second air flow channel is connected to the fifth cavity, and the other end is connected to the low-pressure gauge. One end of the third air flow channel is connected to the air outlet, and the other end is connected to the low-pressure gauge.

7. The triple pressure reducing valve according to claim 1, characterized in that: It comprises a safety valve, which is installed on the first valve body, and the first-level pressure reducing mechanism is connected with the second pressure reducing mechanism through the safety valve.

8. The triple pressure reducing valve according to claim 1, characterized in that: The first valve body is provided with a plurality of fins.

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