Pressure reducing valve suitable for soda water gas cylinder

Abstract

The pressure reducing valve comprises a valve body, the valve body is provided with a gas cylinder mounting port and a gas outlet port, the valve body is provided with a pressure reducing mechanism, the pressure reducing mechanism comprises a valve element assembly, the valve element assembly is arranged in the valve body, the valve body is provided with a gas inlet assembly, the gas inlet assembly comprises a floating piston, and the valve body is provided with a piston cavity. A part of the floating piston is movably arranged in the piston cavity, the floating piston divides the piston cavity into a first cavity and a second cavity, the valve element assembly is located between the first cavity and the air outlet port, and the second cavity communicates with the exterior of the valve body; the valve body is provided with a through hole, the through hole is located between the piston cavity and the gas cylinder installation opening, and part of the floating piston movably penetrates through the through hole. The floating piston is provided with an air inlet channel, and the air inlet channel communicates with the first cavity and the air bottle mounting opening. When the first cavity is provided with compressed gas, the floating piston can be pushed to move in the direction close to the gas cylinder installation opening, the floating piston further ejects a valve element of the cylinder valve open, and labor is saved.

Description

Technical Field

[0001] This invention relates to the field of pressure reducing valve technology, and in particular to a pressure reducing valve suitable for soda water cylinders. Background Technology

[0002] Soda water cylinders contain high-pressure carbon dioxide gas. If a soda water cylinder without a pressure reducing valve is opened directly, the high-pressure gas will rush out at an extremely high speed, posing a safety hazard. To ensure safety and to produce soda water with a better taste, the carbon dioxide gas in the cylinder needs to be reduced to a certain value using a pressure reducing valve before use. The soda water cylinder has a valve at the opening to control the gas's sealing and opening / closing. The pressure reducing valve has a cylinder mounting port. When the cylinder is screwed onto the mounting port, a sealing element is located inside. The pressure reducing valve has a pin that cooperates with the valve. During screwing, the sealing element is first compressed by the cylinder opening to ensure proper sealing between the cylinder opening and the pressure reducing valve. For airtight sealing and to prevent leakage, as the screwing action continues, the ejector pin gradually opens the valve core of the cylinder valve, allowing gas from the cylinder to enter the cylinder installation port. A reaction force is applied, but at this point, the valve core is not fully open, and the operator still needs to continue screwing. However, the reaction force makes subsequent screwing difficult, even impossible. In this situation, the operator cannot judge by touch whether the valve core is fully open. This uncertainty makes it difficult for the operator to control the screwing force, easily leading to over-tightening. This causes the seal to undergo plastic deformation due to excessive compression, resulting in seal failure and a potential safety hazard of gas leakage. Therefore, improvements are necessary. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a pressure reducing valve suitable for soda water cylinders. This valve features a simple and reasonable structure, is easy to operate, and allows the floating piston to open the valve core without manual tightening. Under pressure, the floating piston moves towards the cylinder, further opening the valve core and ensuring it is fully open, thus saving effort. Furthermore, the floating piston continuously applies force to the valve core, ensuring a consistent gas supply.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The present invention discloses a pressure reducing valve suitable for soda water cylinders, comprising a valve body having a cylinder mounting port and an outlet port. The valve body is provided with a pressure reducing mechanism, which includes a valve core assembly disposed within the valve body. The valve body is also provided with an air inlet assembly, which includes a floating piston. The valve body has a piston chamber, and a portion of the floating piston is movably disposed within the piston chamber, dividing the piston chamber into a first chamber and a second chamber. The valve core assembly is located between the first chamber and the outlet port, and the second chamber communicates with the outside of the valve body. The valve body is provided with a through hole, which is located between the piston chamber and the gas cylinder mounting port, and a portion of the floating piston moves through the through hole. The floating piston has an air intake channel, one end of which is connected to the first chamber and the other end of which is connected to the gas cylinder mounting port. When the first chamber contains compressed gas, the compressed gas in the first chamber can push the floating piston to move towards the direction of the gas cylinder installation port.

[0005] Furthermore, the valve body includes a valve body and an air inlet connector. The valve body has the air outlet port, the air inlet connector has the gas cylinder mounting port, the valve body and the air inlet connector are connected in a mating manner, the piston chamber is located between the valve body and the air inlet connector, and the through hole is provided in the air inlet connector.

[0006] Furthermore, the floating piston includes a piston portion and a push rod portion. The piston portion is located inside the piston chamber. A first sealing ring is provided between the piston portion and the peripheral wall of the piston chamber. The push rod portion is movably inserted through the through hole. A second sealing ring is provided between the push rod portion and the peripheral wall of the through hole. The piston portion and the push rod portion are fitted together to form an air intake channel.

[0007] Furthermore, the valve body is provided with an elastic element that cooperates with the floating piston, the elastic element causing the floating piston to always tend to move away from the gas cylinder installation port.

[0008] Furthermore, the elastic element is a wave-shaped washer, which is disposed in the second cavity and abuts against the floating piston.

[0009] Furthermore, a third sealing ring is provided inside the gas cylinder mounting port, and the third sealing ring is in a sealing fit with the gas cylinder opening.

[0010] Furthermore, a filter is installed inside the air intake channel.

[0011] Furthermore, the valve body has a valve cavity, and the pressure reducing mechanism further includes a pressure regulating component that cooperates with the valve core assembly. The valve cavity includes a first valve cavity portion and a second valve cavity portion. The valve core assembly is disposed in the first valve cavity portion, and at least a portion of the pressure regulating component is disposed in the second valve cavity portion.

[0012] Further, the valve core assembly includes a first valve core seat, a second valve core seat, a valve core push rod, a push rod seat, a valve core spring, and a sealing gasket. The first valve core seat is fixedly disposed in the first valve cavity, and the second valve core seat is fixedly connected to the first valve core seat. The first valve core seat is hollow. The valve core push rod and the push rod seat are both disposed within the first valve core seat. The push rod seat is confined between the first valve core seat and the second valve core seat. A guide channel is provided within the push rod seat, and the valve core push rod is slidably disposed within the guide channel. A portion of the valve core push rod is guided and engaged with the peripheral sidewall of the guide channel. The sealing gasket is confined between the first valve core seat and the push rod seat, and the sealing gasket has a valve... The valve core push rod is partially inserted through the valve port and sealed to it. The valve core spring cooperates with the valve core push rod to drive the valve core push rod to move towards the valve port. The end of the valve core push rod near the pressure regulating component is set as a guide end. The first valve core seat is provided with a guide hole that cooperates with the guide end. The guide hole and the guide channel are coaxially arranged. The second valve core seat is provided with an air inlet. A gap is formed between the valve core push rod and the peripheral sidewall of the guide channel. The first valve core seat is provided with an air outlet. One end of the valve port is connected to the air inlet through the gap, and the other end of the valve port is connected to the air outlet. The air outlet is also connected to the air outlet port.

[0013] Furthermore, the pressure regulating assembly includes a pressure regulating nut, a pressure regulating piston, and a pressure regulating spring. The pressure regulating nut is threadedly connected to the peripheral wall of the second valve cavity. One end of the pressure regulating spring abuts against the pressure regulating nut, and the other end of the pressure regulating spring abuts against the pressure regulating piston. The valve core assembly includes a valve core push rod, which abuts against the pressure regulating piston. A fourth sealing ring is provided between the pressure regulating piston and the peripheral wall of the second valve cavity. The peripheral wall of the second valve cavity is provided with a pressure relief port that cooperates with the fourth sealing ring. The pressure relief port is located on the sliding path of the pressure regulating piston.

[0014] The beneficial effects of this invention are as follows: The pressure reducing valve for soda water cylinders described in this invention includes a valve body with a cylinder mounting port and an outlet port. The valve body is provided with a piston chamber and an inlet assembly. The inlet assembly includes a floating piston, a portion of which is movably disposed within the piston chamber. The floating piston divides the piston chamber into a first chamber and a second chamber. The floating piston has an inlet channel, one end of which communicates with the first chamber, and the other end of which communicates with the cylinder mounting port. During the process of screwing the cylinder into the cylinder mounting port, the push rod of the floating piston pushes open the valve core of the cylinder valve, causing the cylinder valve to initially open, and the gas in the cylinder passes through the inlet valve. The gas enters the first chamber through the gas passage. When the first chamber contains compressed gas, the compressed gas in the first chamber can push the floating piston to move towards the gas cylinder installation port, so that the push rod can further push open the valve core of the cylinder valve, ensuring that the valve core of the cylinder valve is fully opened. This eliminates the need for operators to manually tighten it, avoiding the problem of damage to the seal due to over-tightening and achieving labor-saving operation. Moreover, the push rod can continuously apply force to the valve core of the cylinder valve under the action of gas pressure, ensuring that the valve core of the cylinder valve is always in a fully open state, ensuring a stable gas supply, and enabling the soda water cylinder to continuously and stably output carbon dioxide gas. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural schematic diagram of the first embodiment of the present invention; Figure 2 yes Figure 1 Enlarged structural diagram at point A; Figure 3 yes Figure 1 Enlarged structural diagram at point B; Figure 4 This is a schematic diagram of the first cross-sectional structure of the second embodiment of the present invention; Figure 5 This is a schematic diagram of the second cross-sectional structure of the second embodiment of the present invention; Figure 6 This is a structural schematic diagram of the valve core assembly.

[0016] Figures 1-6 middle: 1. Air intake connector; 11. Gas cylinder mounting port; 111. Third sealing ring; 12. Through hole; 13. The second step; 2. Floating piston; 21. Top rod portion; 211. Protruding post; 212. Second pressure-bearing surface; 213. Second sealing ring; 22. Piston section; 221. First pressure-bearing surface; 222. First sealing ring; 23. Air intake channel; 231. Air intake port; 232. Air outlet; 2321. Filter plate; 31. First valve core seat; 312. Air outlet; 313. Guide part; 314. Threaded part; 315. Guide hole; 32. Valve core push rod; 321. Guide end; 33. Push rod seat; 331. Sealing gasket; 3311. Valve port; 332. Guide channel; 34. Second valve core seat; 341. Air inlet; 342. Fifth sealing ring; 35. Valve core spring; 4. Voltage regulating component; 41. Pressure adjusting nut; 42. Pressure adjusting spring; 43. Pressure regulating piston; 431. Fourth sealing ring; 5. Valve body; 51. Air outlet port; 521. First valve chamber; 522. Pressure regulating chamber; 53. Vent; 54. Pressure relief port; 61. First cavity; 62. Second cavity; 63. First step section; 7. Wave-shaped washer. Detailed Implementation

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] like Figures 1-6 The diagram shows a pressure reducing valve for soda water cylinders, comprising a valve body having a cylinder mounting port 11 and an outlet port 51. The cylinder mounting port 11 is connected to the cylinder, and the cylinder opening is equipped with a cylinder valve. The valve body has a pressure reducing mechanism, which includes a valve core assembly disposed within the valve body. The valve body also has an air inlet assembly, which includes a floating piston 2. The valve body has a piston chamber, and a portion of the floating piston 2 is movably disposed within the piston chamber, dividing the piston chamber into a first chamber 61 and a second chamber 62. The valve core assembly is located between the first chamber 61 and the outlet port 51. The second chamber 62 communicates with the outside of the valve body, i.e., with the atmosphere, to balance pressure and ensure that the floating piston 2 can slide normally.

[0019] refer to Figure 2 , Figure 4 The valve body is provided with a through hole 12, which is located between the piston chamber and the gas cylinder mounting port 11, and a portion of the floating piston 2 is movably inserted through the through hole 12. The floating piston 2 has an air intake channel 23, one end of which is connected to the first chamber 61, and the other end of which is connected to the gas cylinder mounting port 11. When the first chamber 61 contains compressed gas, the compressed gas in the first chamber 61 can push the floating piston 2 to move toward the direction of the gas cylinder mounting port 11.

[0020] Preferably, in this embodiment, the reference Figure 2 , Figure 4 The floating piston 2 includes a piston portion 22 and a push rod portion 21. The piston portion 22 and the push rod portion 21 are provided with an air intake channel 23. The piston portion 22 and the push rod portion 21 are arranged in a "T" shape on the longitudinal axis section. The piston portion 22 is located in the piston cavity. A first sealing ring 222 is provided between the piston portion 22 and the peripheral wall of the piston cavity. The piston portion 22 is slidably sealed to the peripheral wall of the piston cavity through the first sealing ring 222. In this embodiment, the piston portion 22 has a first mounting groove for installing the first sealing ring 222. Of course, in other embodiments, the first mounting groove can also be provided on the peripheral wall of the piston cavity.

[0021] The top rod 21 is movably inserted through the through hole 12. A second sealing ring 213 is provided between the top rod 21 and the peripheral wall of the through hole 12. The top rod 21 is slidably sealed to the peripheral wall of the through hole 12 through the second sealing ring 213. In this embodiment, the top rod 21 has a second mounting groove for installing the second sealing ring 213. Of course, in other embodiments, the second mounting groove can also be provided on the peripheral wall of the through hole 12.

[0022] Specifically, both the first sealing ring 222 and the second sealing ring 213 are configured as O-rings.

[0023] refer to Figure 2 The piston portion 22 has a first pressure-bearing surface 221 at one end of the first chamber 61. The gas in the first chamber 61 acts on the first pressure-bearing surface 221. The push rod portion 21 has a second pressure-bearing surface 212 at one end near the gas cylinder mounting port 11. Specifically, there is an annular transition surface between the piston portion 22 and the push rod portion 21, which is the second pressure-bearing surface 212. The gas in the gas cylinder mounting port 11 acts on the second pressure-bearing surface 212. The area of ​​the first pressure-bearing surface 221 is larger than the area of ​​the second pressure-bearing surface 212. Because the area of ​​the first pressure-bearing surface 221 is larger than the area of ​​the second pressure-bearing surface 212, the pressure generated by the gas in the first chamber 61 acting on the first pressure-bearing surface 221 is greater than the pressure generated by the gas in the gas cylinder mounting port 11 acting on the second pressure-bearing surface 212, causing the floating piston 2 to move towards the gas cylinder under the action of gas pressure.

[0024] In the prior art, a cylinder valve is provided at the mouth of the soda water cylinder. The cylinder valve is used to seal and open / close the gas. The pressure reducing valve has a cylinder mounting port 11. The cylinder is installed to the cylinder mounting port 11 by a threaded connection, that is, the cylinder is screwed onto the cylinder mounting port 11. The cylinder mounting port 11 of the soda water cylinder has a sealing element for sealing. The pressure reducing valve has a pin that cooperates with the cylinder valve. During the screwing process, the sealing element is first pressed and compressed by the cylinder mouth to ensure sealing and prevent leakage. As the screwing action continues, the pin gradually pushes open the valve core of the cylinder valve, allowing gas to flow through. When the gas inside the cylinder enters the cylinder mounting port 11, it applies a reaction force. At this time, the valve core of the cylinder valve is not fully open, and the operator still needs to continue to turn it. However, the reaction force makes the subsequent turning operation difficult, and may even make it difficult to turn. In this situation, it is difficult for the operator to judge by touch whether the valve core of the cylinder valve has been fully opened. This uncertainty makes it difficult for the operator to control the turning force, which can easily lead to over-tightening. This can cause the sealing element to undergo plastic deformation due to excessive compression, resulting in sealing failure and a safety hazard of gas leakage.

[0025] It should be noted that the ejector pin needs to be displaced to the correct position and maintain its current position to ensure continuous gas output from the cylinder. If the tightening force is too small, the ejector pin will not be displaced to the correct position, and the valve core of the cylinder valve will not be fully opened, resulting in insufficient gas output and affecting the soda water production effect. In addition, the seal is prone to rebound due to insufficient force. After rebounding, the ejector pin will not be able to maintain its current displacement state, causing the gas supply to be interrupted and affecting use. If the tightening force is too large, it will damage the seal.

[0026] The pressure reducing valve for soda water cylinders described in this invention, during the process of screwing the cylinder into the cylinder mounting port 11, has its push rod 21 push open the valve core of the cylinder valve, initially opening the valve. Gas from the cylinder enters the first chamber 61 through the air inlet channel 23. When the first chamber 61 contains compressed gas, the compressed gas in the first chamber 61 can push the floating piston 2 towards the cylinder mounting port 11, allowing the push rod 21 to further push open the valve core of the cylinder valve, ensuring that the valve core is fully opened. This eliminates the need for manual and strenuous screwing by the operator, avoiding damage to the seals due to over-tightening and achieving labor-saving operation. Moreover, the push rod 21 can continuously apply force to the valve core of the cylinder valve under air pressure, ensuring that the valve core is always fully open, ensuring a stable gas supply, and enabling the soda water cylinder to continuously and stably output carbon dioxide gas.

[0027] In one embodiment, the piston portion 22 and the push rod portion 21 are integrally formed and coaxially arranged. This integral arrangement can ensure the connection strength and motion consistency between the piston portion 22 and the push rod portion 21.

[0028] In another embodiment, the piston part 22 and the push rod part 21 are fixedly connected by means of threaded connection, welding or interference fit to ensure the stability of the connection. The piston part 22 and the push rod part 21 are coaxially arranged to ensure the stability of the floating piston 2 during the movement process and avoid deviation or shaking.

[0029] refer to Figures 1-2 The valve body 5 has a first stepped portion 63 that engages with the piston portion 22, and the air inlet connector 1 has a second stepped portion 13 that engages with the piston portion 22. The piston portion 22 is buoyantly disposed between the first stepped portion 63 and the second stepped portion 13. A protruding post 211 is provided at one end of the push rod portion 21 near the gas cylinder mounting port 11. At least a portion of the protruding post 211 extends into the gas cylinder mounting port 11 and engages with the valve of the soda water cylinder.

[0030] The protrusion 211 is provided with an air inlet 231 that communicates with the gas cylinder mounting port 11, and the piston part 22 is provided with an air outlet 232 that communicates with the first chamber 61. The two ports of the air inlet channel 23 correspond to the air inlet 231 and the air outlet 232, respectively.

[0031] Preferably, in this embodiment, the reference Figure 1 , Figure 4 The valve body includes a valve body 5 and an air inlet connector 1. The valve body 5 has an air outlet port 51, and the air inlet connector 1 has a gas cylinder mounting port 11. The valve body 5 and the air inlet connector 1 are connected in a mating manner. Specifically, the valve body 5 and the air inlet connector 1 are connected by a threaded connection. One end of the valve body 5 connected to the air inlet connector 1 has a first external thread, and the air inlet connector 1 has a first internal thread that matches the first external thread, ensuring a stable and reliable connection between the valve body 5 and the air inlet connector 1. The piston chamber is located between the valve body 5 and the air inlet connector 1, and the through hole 12 is provided in the air inlet connector 1.

[0032] Preferably, in this embodiment, the valve body is provided with an elastic element that cooperates with the floating piston 2, and the elastic element causes the floating piston 2 to always have a tendency to move away from the gas cylinder installation port 11.

[0033] Preferably, in this embodiment, the elastic element is a wave washer 7, which is disposed in the second cavity 62. The wave washer 7 abuts against the piston portion 22 of the floating piston 2. After the gas cylinder is removed, the floating piston 2 can rebound under the elastic action of the wave washer 7. Compared with conventional springs, the wave washer 7 has a smaller thickness, which can effectively save installation space.

[0034] Preferably, in this embodiment, a third mounting groove is provided in the gas cylinder mounting port 11, and a third sealing ring 111 is provided in the third mounting groove. Of course, in other embodiments, the third mounting groove can also be provided on the peripheral side wall of the piston chamber. The third sealing ring 111 is sealed and fitted with the gas cylinder mouth. When the gas cylinder is connected to the gas cylinder mounting port 11, the gas cylinder mouth first contacts and abuts against the third sealing ring 111 to form a seal, and then the protrusion 211 pushes open the valve core of the cylinder valve, so that the compressed gas in the gas cylinder enters the pressure reducing valve, ensuring effective sealing connection between the gas cylinder and the gas cylinder mounting port 11.

[0035] Preferably, the cross-section of the third sealing ring 111 is elliptical, and the major axis of the elliptical cross-section is consistent with the height direction of the third sealing ring 111 (i.e., the axial / thickness direction during installation or use). Compared with the traditional O-ring, this elliptical cross-section design allows the third sealing ring 111 to obtain a larger compression amount while having a smaller rebound force, so as to provide a more reliable sealing effect.

[0036] Preferably, in this embodiment, a filter 2321 is provided in the air intake channel 23 to filter impurities, and the piston part 22 is provided with a groove that cooperates with the filter 2321, and the filter 2321 is disposed in the groove.

[0037] Preferably, in this embodiment, the valve body has a valve cavity and a vent 53, the vent 53 is located between the piston cavity and the valve cavity, the pressure reducing mechanism further includes a pressure regulating component 4 that cooperates with the valve core assembly, the valve cavity includes a first valve cavity portion 521 and a second valve cavity portion, the valve core assembly is disposed in the first valve cavity portion 521, and at least a portion of the pressure regulating component 4 is disposed in the second valve cavity portion.

[0038] Figures 1-3 This is a schematic diagram of the structure of the first embodiment of the present invention. Figures 4-5 This is a schematic diagram of the structure of the second embodiment of the present invention. The shape of the valve body 5 is different in the two embodiments.

[0039] refer to Figure 3 , Figure 6Preferably, in this embodiment, the valve core assembly includes a first valve core seat 31, a second valve core seat 34, a valve core push rod 32, a push rod seat 33, a valve core spring 35, and a sealing gasket 331. The first valve core seat 31 is fixedly disposed in the first valve cavity portion 521 of the valve cavity. Along the axial direction of the first valve core seat 31, the first valve core seat 31 has a guide portion 313 and a threaded portion 314. Compared with the threaded portion 314, the guide portion 313 is disposed closer to the floating piston 2. The guide portion 313 is guided and engaged with the peripheral sidewall of the first valve cavity portion 521. The threaded portion 314 is fixedly connected to the peripheral sidewall of the first valve cavity portion 521. The threaded portion 314 is provided with a second external thread. The peripheral sidewall of the first valve cavity portion 521 has a second internal thread that matches the second external thread, ensuring a stable and reliable connection.

[0040] The second valve core seat 34 is fixedly connected to the first valve core seat 31. The outer peripheral wall of the second valve core seat 34 is provided with a third external thread, and the inner peripheral wall of the first valve core seat 31 has a third internal thread that matches the third external thread, ensuring a stable and reliable connection. The first valve core seat 31 is hollow. The valve core push rod 32, push rod seat 33, and valve core spring 35 are all disposed within the first valve core seat 31. The push rod seat 33 is axially confined between the first valve core seat 31 and the second valve core seat 34. The valve core push rod 32 is disposed within the push rod seat 33 and can slide axially along the push rod seat 33. The sealing gasket 331 is axially confined between the first valve core seat 31 and the push rod seat 33. The push rod seat 33 is provided with a guide channel 332, and the valve core push rod 32 is slidably disposed within the guide channel 33. The valve core push rod 32 is guided into the channel 332, and a portion of the valve core push rod 32 is guided and engaged with the peripheral wall of the guide channel 332. The sealing gasket 331 is confined between the first valve core seat 31 and the push rod seat 33. The sealing gasket 331 has a valve port 3311. A portion of the valve core push rod 32 passes through the valve port 3311 and is sealed and engaged with the valve port 3311. The valve core spring 35 engages with the valve core push rod 32 to drive the valve core push rod 32 to move toward the valve port 3311. The valve core push rod 32 has a tapered structure. The outer diameter of the valve core push rod 32 decreases toward the side adjacent to the valve port 3311 as it moves deeper into the valve port 3311. As the valve core push rod 32 continues to penetrate into the valve port 3311, the gap between the valve core push rod 32 and the inner wall of the valve port 3311 gradually narrows until the valve port 3311 is blocked.

[0041] A fifth sealing ring 342 is provided between the second valve core seat 34 and the first valve core seat 31. In this embodiment, the second valve core seat 34 is provided with a fifth mounting groove for installing the fifth sealing ring 342. Of course, in other embodiments, the fifth mounting groove can also be provided on the inner wall of the first valve core seat 31.

[0042] The end of the valve core push rod 32 near the pressure regulating component 4 is set as a guide end 321. The guide end 321 is connected to the pressure regulating component 4. The pressure regulating component 4 is used to adjust the opening between the valve core push rod 32 and the valve port 3311.

[0043] The first valve core seat 31 is provided with a guide hole 315 that guides and cooperates with the guide end 321. The guide hole 315 is coaxially arranged with the guide channel 332. The guide channel 332 and the guide hole 315 provide guidance and support for the valve core push rod 32, preventing the valve core push rod 32 from shaking undesirably and ensuring the smooth movement of the valve core push rod 32. The second valve core seat 34 is provided with an air inlet 341. The valve core push rod 32 and the guide channel 332... A gap is formed between the sidewalls. The first valve core seat 31 is provided with an air outlet 312. One end of the valve port 3311 is connected to the air inlet 341 through the gap, and the other end of the valve port 3311 is connected to the air outlet 312. The air outlet 312 is also connected to the air outlet port 51. The compressed gas in the first cavity 61 passes through the air inlet 53, the air inlet 341, the valve port 3311, and the air outlet 312 in sequence, and finally flows out to the air outlet port 51.

[0044] During installation, the valve core assembly can be pre-assembled as a whole and then installed into the first valve cavity 521 to improve assembly efficiency.

[0045] Preferably, in this embodiment, the pressure regulating assembly 4 includes a pressure regulating nut 41, a pressure regulating piston 43, and a pressure regulating spring 42. The pressure regulating nut 41 is threadedly connected to the peripheral wall of the second valve cavity. One end of the pressure regulating spring 42 abuts against the pressure regulating nut 41, and the other end of the pressure regulating spring 42 abuts against the pressure regulating piston 43. The pressure regulating spring 42 drives the pressure regulating piston 43 to move toward the valve port 3311. The valve core assembly includes a valve core push rod 32, which abuts against the pressure regulating piston 43. By rotating the pressure regulating nut 41, the pressure regulating spring 42 acts on the pressure regulating piston 43 to change the displacement of the pressure regulating piston 43, thereby adjusting the opening between the valve core push rod 32 and the valve port 3311, and thus adjusting the outlet pressure.

[0046] A fourth sealing ring 431 is provided between the pressure regulating piston 43 and the peripheral wall of the second valve cavity. In this embodiment, the pressure regulating piston 43 is provided with a fourth mounting groove for installing the fourth sealing ring 431. Of course, in other embodiments, the fourth mounting groove can also be provided on the peripheral wall of the second valve cavity. The pressure regulating piston 43 is slidably sealed to the peripheral wall of the second valve cavity through the fourth sealing ring 431. A pressure regulating chamber 522 is provided between the pressure regulating piston 43 and the valve core assembly. The pressure regulating chamber 522 is connected to the air outlet 312 of the valve core assembly. The peripheral wall of the second valve cavity is provided with a pressure relief port 54 that cooperates with the fourth sealing ring 431. The compressed gas in the pressure regulating chamber 522 passes through... The pressure relief port 54 is connected to the external atmosphere and is located on the sliding path of the pressure regulating piston 43. Preferably, the fourth sealing ring 431 is a Y-shaped sealing ring with the opening facing away from the pressure regulating spring 42. Under normal conditions, the Y-shaped sealing ring is used to block the connection between the pressure regulating chamber 522 and the pressure relief port 54, so that the compressed gas in the pressure regulating chamber 522 cannot be discharged through the pressure relief port 54. When the gas pressure in the pressure regulating chamber 522 exceeds the preset threshold, the gas pressure pushes the pressure regulating piston 43 to slide, causing the Y-shaped sealing ring to move synchronously. When the Y-shaped sealing ring moves to the point where it can no longer seal the pressure relief port 54, the high-pressure gas in the pressure regulating chamber 522 can be connected to the outside through the pressure relief port 54 to achieve pressure relief.

[0047] In the prior art, pressure reducing valves require an additional pressure relief device to achieve the pressure relief function. However, the pressure reducing valve for soda water cylinders described in this invention does not require an additional pressure relief device, effectively saving costs.

[0048] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A pressure reducing valve for soda water cylinders, comprising a valve body having a cylinder mounting port (11) and a gas outlet port (51), the valve body being provided with a pressure reducing mechanism, the pressure reducing mechanism including a valve core assembly disposed within the valve body, characterized in that: The valve body is provided with an air intake assembly, which includes a floating piston (2). The valve body is provided with a piston chamber. Part of the floating piston (2) is movably disposed in the piston chamber. The floating piston (2) divides the piston chamber into a first chamber (61) and a second chamber (62). The valve core assembly is located between the first chamber (61) and the air outlet (51). The second chamber (62) is connected to the outside of the valve body. The valve body is provided with a through hole (12), which is located between the piston chamber and the gas cylinder mounting port (11), and part of the floating piston (2) moves through the through hole (12). The floating piston (2) has an air intake channel (23), one end of which is connected to the first chamber (61), and the other end of which is connected to the gas cylinder mounting port (11). When the first chamber (61) contains compressed gas, the compressed gas in the first chamber (61) can push the floating piston (2) to move toward the gas cylinder mounting port (11).

2. The pressure reducing valve for soda water cylinders according to claim 1, characterized in that: The valve body includes a valve body (5) and an air inlet connector (1). The valve body (5) has the air outlet port (51), and the air inlet connector (1) has the gas cylinder mounting port (11). The valve body (5) and the air inlet connector (1) are connected in a cooperative manner. The piston chamber is located between the valve body (5) and the air inlet connector (1). The through hole (12) is provided in the air inlet connector (1).

3. A pressure reducing valve for soda water cylinders according to claim 1, characterized in that: The floating piston (2) includes a piston part (22) and a push rod part (21). The piston part (22) is located in the piston chamber. A first sealing ring (222) is provided between the piston part (22) and the peripheral wall of the piston chamber. The push rod part (21) is movably inserted through the through hole (12). A second sealing ring (213) is provided between the push rod part (21) and the peripheral wall of the through hole (12). The piston part (22) and the push rod part (21) are provided with an air intake channel (23).

4. A pressure reducing valve for soda water cylinders according to claim 1 or 3, characterized in that: The valve body is provided with an elastic element that cooperates with the floating piston (2), the elastic element causing the floating piston (2) to always tend to move away from the gas cylinder installation port (11).

5. A pressure reducing valve for soda water cylinders according to claim 4, characterized in that: The elastic element is a wave washer (7), which is disposed in the second cavity (62) and abuts against the floating piston (2).

6. A pressure reducing valve for soda water cylinders according to claim 1, characterized in that: A third sealing ring (111) is provided inside the gas cylinder mounting port (11), and the third sealing ring (111) is sealed to the gas cylinder opening.

7. A pressure reducing valve for soda water cylinders according to claim 1, characterized in that: A filter (2321) is installed in the air intake channel (23).

8. A pressure reducing valve for soda water cylinders according to claim 1, characterized in that: The valve body has a valve cavity, and the pressure reducing mechanism further includes a pressure regulating component (4) that cooperates with the valve core assembly. The valve cavity includes a first valve cavity portion (521) and a second valve cavity portion. The valve core assembly is disposed in the first valve cavity portion (521), and at least a portion of the pressure regulating component (4) is disposed in the second valve cavity portion.

9. A pressure reducing valve for soda water cylinders according to claim 8, characterized in that: The valve core assembly includes a first valve core seat (31), a second valve core seat (34), a valve core push rod (32), a push rod seat (33), a valve core spring (35), and a sealing gasket (331). The first valve core seat (31) is fixedly disposed in the first valve cavity (521), and the second valve core seat (34) is fixedly connected to the first valve core seat (31). The first valve core seat (31) is hollow. The valve core push rod (32) and the push rod seat (33) are both disposed inside the first valve core seat (31). (33) is confined between the first valve core seat (31) and the second valve core seat (34). The push rod seat (33) is provided with a guide channel (332). The valve core push rod (32) is slidably disposed in the guide channel (332), and part of the valve core push rod (32) is guided and engaged with the peripheral sidewall of the guide channel (332). The sealing gasket (331) is confined between the first valve core seat (31) and the push rod seat (33). The sealing gasket (331) has a valve port (3311). The valve core... Part of the push rod (32) passes through the valve port (3311) and is sealed to the valve port (3311). The valve core spring (35) cooperates with the valve core push rod (32) to drive the valve core push rod (32) to move toward the valve port (3311). The end of the valve core push rod (32) near the pressure regulating assembly (4) is set as a guide end (321). The first valve core seat (31) is provided with a guide hole (315) that cooperates with the guide end (321). The guide hole (315) and the guide channel (3311) are connected. 32) The second valve core seat (34) is coaxially arranged and has an air inlet (341). A gap is formed between the valve core push rod (32) and the peripheral side wall of the guide channel (332). The first valve core seat (31) has an air outlet (312). One end of the valve port (3311) is connected to the air inlet (341) through the gap. The other end of the valve port (3311) is connected to the air outlet (312). The air outlet (312) is also connected to the air outlet port (51).

10. A pressure reducing valve for soda water cylinders according to claim 8, characterized in that: The pressure regulating assembly (4) includes a pressure regulating nut (41), a pressure regulating piston (43), and a pressure regulating spring (42). The pressure regulating nut (41) is threadedly connected to the peripheral wall of the second valve chamber. One end of the pressure regulating spring (42) abuts against the pressure regulating nut (41), and the other end of the pressure regulating spring (42) abuts against the pressure regulating piston (43). The valve core assembly includes a valve core push rod (32). The valve core push rod (32) abuts against the pressure regulating piston (43). A fourth sealing ring (431) is provided between the pressure regulating piston (43) and the peripheral wall of the second valve chamber. A pressure relief port (54) that cooperates with the fourth sealing ring (431) is provided on the peripheral wall of the second valve chamber. The pressure relief port (54) is located on the sliding path of the pressure regulating piston (43).

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