Pressure reducing valve assembly

Abstract

This application discloses a pressure reducing valve assembly, comprising: a pressure reducing valve body with a pressure relief channel within it, and an inlet and an outlet respectively communicating with the pressure relief channel at both ends of the pressure reducing valve body; and a safety valve comprising: a valve body and an actuator, wherein a connector is formed at one end of the valve body, and a first exhaust port communicating with the atmosphere is formed at the other end of the valve body, the connector being connected to the pressure reducing valve body, and the actuator being disposed within the valve body and adapted to selectively connect the first exhaust port to the pressure relief channel. Therefore, on the one hand, compared with traditional safety valves, the safety valve of this application has better valve body adaptability, a more reasonable structure, and simpler installation, while possessing higher versatility; on the other hand, with fewer components and higher compatibility, the design difficulty and processing cost of the safety valve can be reduced, thereby reducing the production cost of the pressure reducing valve assembly.

Description

Technical Field

[0001] This invention relates to the field of pressure reducing valve technology, and in particular to a pressure reducing valve assembly. Background Technology

[0002] In related technologies, pressure reducing valves can be used as pressure reducing devices for pneumatic or hydraulic systems. To prevent excessive pressure in the downstream pipeline caused by pressure reducing valve failure, a safety valve is installed at the low-pressure outlet of the pressure reducing valve. When the outlet pressure of the pressure reducing valve is higher than the opening pressure of the safety valve, the safety valve opens to release the gas in the pipeline, ensuring that the gas pressure in the pipeline does not become too high.

[0003] However, existing safety valves have poor versatility, a large number of parts, large size and weight, and high design difficulty and processing cost. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a pressure reducing valve assembly that is highly versatile, has low processing cost, and is easy to design.

[0005] A pressure reducing valve assembly according to a first aspect of this application includes: a pressure reducing valve body, wherein a pressure relief channel is provided within the pressure reducing valve body, and an air inlet and an air outlet are respectively provided at both ends of the pressure reducing valve body and communicating with the pressure relief channel; and a safety valve, wherein the safety valve includes: a valve body and an actuating component, wherein a connector is formed at one end of the valve body, and a first exhaust port communicating with the atmosphere is formed at the other end of the valve body, the connector is connected to the pressure reducing valve body, and the actuating component is disposed within the valve body and is adapted to selectively connect the first exhaust port with the pressure relief channel.

[0006] According to the embodiments of the present application, the pressure reducing valve assembly, by constructing at least a portion of the valve body of the safety valve disposed on the pressure reducing valve body as a connector, and the actuating component disposed within the valve body, on the one hand, makes the safety valve of the present application more adaptable to the valve body, more rational in structure, simpler to install, and more versatile than traditional safety valves; on the other hand, with fewer parts and higher compatibility, the design difficulty and processing cost of the safety valve can be reduced, thereby reducing the production cost of the pressure reducing valve assembly.

[0007] According to some embodiments of this application, the connector is constructed as a snap-fit ​​connector or a threaded connector.

[0008] In some embodiments, a connecting block is provided on the outer peripheral wall of the pressure reducing valve body, and a bypass hole communicating with the pressure relief channel is provided in the connecting block. The connector is engaged with the bypass hole by snap-fit ​​or thread engagement.

[0009] Furthermore, a sealing hole is provided at the end of the bypass hole facing the valve body. The diameter of the sealing hole gradually increases in the direction away from the bypass hole, and a sealing element is provided between the connecting block and the connector. The sealing element is interference-fitted with the sealing hole.

[0010] According to some embodiments of this application, an annular baffle is provided in the valve body, and the actuating component abuts against the side wall of the annular baffle on the side facing the bypass hole.

[0011] In some embodiments, the actuating component includes: an elastic element, one end of which abuts against the annular baffle; a movable seat, slidably disposed within the valve body and the other end of the elastic element abutting against the movable seat; a fixed seat, fixed to the connector; and a gasket disposed between the movable seat and the fixed seat and adapted to push the movable seat away from the fixed seat under pressure to communicate the first vent hole with the bypass hole.

[0012] Furthermore, the movable seat includes: a first pipe section and a second pipe section, the first pipe section being slidably fitted with the inner wall of the valve body, and at least a portion of the outer diameter of the second pipe section being smaller than the outer diameter of the first pipe section to define a first gas passage with the inner wall of the valve body, wherein the gas in the bypass hole is adapted to be discharged through the first gas passage.

[0013] Furthermore, the second pipe section is provided with a plurality of second exhaust holes in the circumferential direction, and the first pipe section is hollow to define a second gas channel communicating with the first exhaust hole. One end of the second exhaust hole is connected to the first gas channel, and the other end of the first exhaust hole is connected to the second gas channel.

[0014] Furthermore, the second pipe section is hollow to define a receiving groove, the gasket is disposed in the receiving groove and is interference-fitted with the receiving groove, and the receiving groove is spaced apart from the second vent hole.

[0015] Furthermore, the receiving tank is connected to the second gas channel through a third exhaust port.

[0016] In some embodiments, in a direction away from the valve body, the fixing seat includes a third pipe segment, a fourth pipe segment, and a fifth pipe segment connected in sequence with gradually increasing outer diameters, the third pipe segment pushing against the gasket, and the fourth and fifth pipe segments being fixed to the connector.

[0017] Furthermore, the outer diameter of the third pipe section is smaller than the inner diameter of the receiving groove and extends into the receiving groove to push against the gasket.

[0018] Furthermore, the outer wall of the fourth pipe section is interference-fitted with the inner wall of the valve body.

[0019] Furthermore, the end face of the fourth pipe segment is spaced apart from the end face of the second pipe segment.

[0020] In some embodiments, the fifth pipe segment is located outside the connector, and a gas guide hole is provided at the end of the fifth pipe segment away from the first exhaust hole. The diameter of the gas guide hole gradually decreases in the direction toward the first exhaust hole.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a perspective view of a pressure reducing valve assembly according to an embodiment of this application;

[0024] Figure 2 This is a partial cross-sectional schematic diagram of a pressure reducing valve assembly according to an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the movable seat of the pressure reducing valve assembly according to an embodiment of this application;

[0026] Figure 4 This is another schematic diagram of the movable seat of the pressure reducing valve assembly according to an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of a mounting base for a pressure reducing valve assembly according to an embodiment of this application;

[0028] Figure 6 This is another schematic diagram of the mounting base of the pressure reducing valve assembly according to an embodiment of this application.

[0029] Figure label:

[0030] Pressure reducing valve assembly 100,

[0031] Pressure reducing valve body 10, connecting block 11, bypass hole 12, sealing hole 13

[0032] Safety valve 20, valve body 21, first vent 211, actuating assembly 22, elastic element 221, movable seat 222, first pipe section 2221, second pipe section 2222, second vent 2223, receiving groove 2224, third vent 2225, fixed seat 223, third pipe section 2231, fourth pipe section 2232, fifth pipe section 2233, gas guide hole 2234, gasket 224, connector 23, annular baffle 24.

[0033] Seal 30,

[0034] First gas channel a, second gas channel b. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] The following is for reference. Figures 1-6 A pressure reducing valve assembly 100 according to an embodiment of the present invention is described.

[0037] like Figure 1 and Figure 2 As shown, the pressure reducing valve assembly 100 according to the first aspect of this application includes: a pressure reducing valve body 10 and a safety valve 20.

[0038] The pressure reducing valve body 10 has a pressure relief channel, and both ends of the pressure reducing valve body 10 are respectively provided with an air inlet and an air outlet that are connected to the pressure relief channel. The safety valve 20 includes a valve body 21 and an actuator 22. One end of the valve body 21 has a connector 23, and the other end of the valve body 21 has a first exhaust port 211 that is connected to the atmosphere. The connector 23 is connected to the pressure reducing valve body 10. The actuator 22 is disposed inside the valve body 21 and is adapted to selectively connect the first exhaust port 211 to the pressure relief channel.

[0039] Specifically, the pressure reducing valve assembly 100 is installed on a hydraulic or pneumatic system and is suitable for opening when the pipeline pressure is too high to improve system safety. Furthermore, in order to ensure that the pipeline pressure remains below the warning value when the pressure reducing valve body 10 fails to release pressure, a safety valve 20 is installed on the pressure reducing valve body 10. The safety valve 20 can be selectively connected to the pressure relief channel, so that when the pipeline pressure is too high and the pressure reducing valve body 10 fails to release pressure in time, pressure is released through the safety valve 20 to improve the working stability of the pressure reducing valve assembly 100.

[0040] Furthermore, this application forms one end of the safety valve 20 as a connector 23, which is a connector 23 conforming to national standards. The safety valve 20 can be fixed to the pressure reducing valve body 10 through the connector 23, which facilitates the fixing of the safety valve 20 and the pressure reducing valve body 10. At the same time, it makes the specifications and dimensions of the safety valve 20 more reasonable. The use of standard connectors makes it more versatile and easier to assemble, without the need to make adaptive modifications to the pressure reducing valve body 10 based on the structure of the safety valve 20.

[0041] It should be noted that the pressure reducing valve assembly 100 of this application can be applied to a hydraulic system or a pneumatic system. The air inlet, air outlet, air outlet and gas passage in this application are channels or discharge ports and inlets for liquid fluid when the pressure reducing valve assembly 100 is applied to a hydraulic system, and channels or discharge ports and inlets for gaseous fluid when the pressure reducing valve assembly 100 is applied to a pneumatic system.

[0042] According to the embodiments of the present application, the pressure reducing valve assembly 100, by constructing at least a portion of the valve body 21 of the safety valve 20 disposed on the pressure reducing valve body 10 as a connector 23, and the actuating component 22 disposed within the valve body 21, on the one hand, makes the safety valve 20 of the present application more adaptable to the valve body 21, more rational in structure, simpler to install, and more versatile than conventional safety valves; on the other hand, with fewer parts and higher compatibility, the design difficulty and processing cost of the safety valve 20 can be reduced, thereby reducing the production cost of the pressure reducing valve assembly 100.

[0043] Understandably, connector 23 is constructed as a snap-fit ​​connector or a threaded connector. This makes the installation of safety valve 20 on pressure reducing valve body 10 simpler and more convenient.

[0044] exist Figure 1 and Figure 2 In the specific embodiment shown, a connecting block 11 is provided on the outer peripheral wall of the pressure reducing valve body 10. A bypass hole 12 communicating with the pressure relief channel is provided in the connecting block 11. The connector 23 is engaged with the bypass hole 12 by snap-fit ​​or thread. In this way, by providing the connecting block 11, the connection between the valve body 21 and the pressure reducing valve body 10 is more stable and reliable, and the installation of the connector 23 on the pressure reducing valve body 10 is simpler and more convenient.

[0045] like Figure 2 As shown, a sealing hole 13 is provided at the end of the bypass hole 12 facing the valve body 21. The diameter of the sealing hole 13 gradually increases in the direction away from the bypass hole 12. A sealing element 30 is provided between the connecting block 11 and the connector 23. The sealing element 30 is interference-fitted with the sealing hole 13.

[0046] Specifically, the sealing hole 13 is located at one end of the bypass hole 12 near the safety valve 20, and the inner wall of the bypass hole 12 is constructed as an inclined surface that is inclined toward the axis of the bypass hole 12. Then, a sealing element 30 is provided between the inclined surface and the end face of the valve body 21. By pressing the sealing element 30 against the end face of the valve body 21, the sealing performance between the safety valve 20 and the connecting block 11 can be improved, and the working stability of the pressure reducing valve assembly 100 can be improved.

[0047] Understandably, seal 30 is constructed as an "O" ring.

[0048] like Figure 2 As shown, according to some embodiments of this application, an annular baffle 24 is provided inside the valve body 21, and the actuating component 22 pushes against the side wall of the annular baffle 24 on the side facing the bypass hole 12.

[0049] The annular baffle 24 is disposed inside the cavity of the valve body 21, and the through hole of the annular baffle 24 is connected to the first exhaust hole 211. When the actuator 22 controls the pressure relief channel to be connected to the first exhaust hole 211, the discharged gas can flow out to the atmosphere through the through hole and the first exhaust hole 211. At the same time, the actuator 22 is pushed against the annular baffle 24, which facilitates the arrangement of the actuator 22 in the valve body 21 and makes the arrangement position of the valve body 21 more reasonable and the working stability higher.

[0050] exist Figure 2 In the specific embodiments shown, in some embodiments, the execution component 22 includes: an elastic element 221, a movable seat 222, a fixed seat 223, and a gasket 224.

[0051] Specifically, one end of the elastic element 221 abuts against the annular baffle 24; the movable seat 222 is slidably disposed within the valve body 21 and the other end of the elastic element 221 abuts against the movable seat 222; the fixed seat 223 is fixed to the connector 23; the gasket 224 is disposed between the movable seat 222 and the fixed seat 223 and is adapted to push the movable seat 222 away from the fixed seat 223 under pressure so that the first exhaust port 211 communicates with the bypass port 12.

[0052] In other words, in the direction of the valve body 21 toward the bypass hole 12, an elastic element 221, a movable seat 222, a gasket 224, and a fixed seat 223 are arranged in sequence. The elastic element 221 pushes the movable seat 222, and the gasket 224 in the movable seat 222 pushes against the fixed seat 223 to form a sealing structure to prevent gas from overflowing from the pressure relief channel. Then, when the pressure in the pressure relief channel is too high, the gasket 224 can be pushed under the pressure of the gas to compress the elastic element 221 so that the pressure relief channel is connected to the first exhaust hole 211 to achieve pressure relief.

[0053] Therefore, by setting up the execution component 22, the pressure relief process of the safety valve 20 is made simpler and its operation more stable.

[0054] It is understood that the pressure reducing valve assembly 100 of this application is used in different operating environments, and the pressure relief pressure corresponding to the safety valve 20 is different. The pressure relief pressure can be adjusted by adjusting the elastic coefficient of the elastic element 221, the axial length of the moving seat 222 or the fixed seat 223.

[0055] The gasket 224 is disposed between the movable seat 222 and the fixed seat 223. The movable seat 222 pushes against the gasket 224 to ensure that both sides of the gasket 224 are in contact with the movable seat 222 and the fixed seat 223 respectively when the safety valve 20 is not opened, thereby improving the sealing performance of the safety valve 20 and ensuring the sealing effect of the safety valve 20 in the closed state.

[0056] like Figure 3 and Figure 4 As shown, the movable seat 222 includes: a first pipe section 2221 and a second pipe section 2222. The first pipe section 2221 is slidably fitted with the inner wall of the valve body 21. The outer diameter of at least a portion of the second pipe section 2222 is smaller than the outer diameter of the first pipe section 2221 so as to define a first gas passage a with the inner wall of the valve body 21. The gas in the bypass hole 12 is adapted to be discharged through the first gas passage a.

[0057] The second pipe section 2222 is provided with a plurality of second exhaust holes 2223 in the circumferential direction. The first pipe section 2221 is hollow to define a second gas channel b that communicates with the first exhaust hole 211. One end of the second exhaust hole 2223 is connected to the first gas channel a, and the other end of the first exhaust hole 211 is connected to the second gas channel b.

[0058] Specifically, when pressure is released through the safety valve 20, the gas in the pressure relief channel flows out of the fixed seat 223 and enters the first gas channel a, then enters the second gas channel b through the second exhaust port 2223, and then flows out to the first exhaust port 211, thus realizing pressure relief through the safety valve 20.

[0059] exist Figure 4 In the specific embodiment shown, the second pipe section 2222 is hollow to define the receiving groove 2224, the gasket 224 is disposed in the receiving groove 2224 and is interference-fitted with the receiving groove 2224, and the receiving groove 2224 is spaced apart from the second exhaust port 2223, and the receiving groove 2224 is connected to the second gas passage b through the third exhaust port 2225.

[0060] In this way, the gasket 224 and the receiving groove 2224 are interference-fitted, which can improve the working stability of the actuator 22, ensure the sealing performance of the gasket 224 and the fixed seat 223 when they are in the pushing state, and at the same time, the second vent 2223 is separated from the receiving groove 2224, which can prevent gas from overflowing from the receiving groove 2224 to the atmosphere, effectively improving the sealing performance of the safety valve 20. The third vent 2225 is provided on the bottom wall of the receiving groove 2224, which makes the installation of the gasket 224 in the receiving groove 2224 simpler and more convenient, and avoids the gas pressure in the receiving groove 2224 causing the gasket 224 to fail to fit tightly with the receiving groove 2224.

[0061] like Figure 5 and Figure 6 As shown, in the direction away from the valve body 21, the fixed seat 223 includes a third pipe section 2231, a fourth pipe section 2232 and a fifth pipe section 2233 connected in sequence with gradually increasing outer diameters. The third pipe section 2231 pushes against the gasket 224, and the fourth pipe section 2232 and the fifth pipe section 2233 are fixed to the connector 23.

[0062] Specifically, the outer diameter of the third pipe section 2231 is smaller than the inner diameter of the receiving groove 2224 and extends into the receiving groove 2224 to push against the gasket 224; the outer wall of the fourth pipe section 2232 is interference-fitted with the inner wall of the valve body 21, and the end face of the fourth pipe section 2232 is spaced apart from the end face of the second pipe section 2222.

[0063] In this way, while improving the fixing stability of the fixed seat 223 and the connector 23, the third pipe section 2231 with the smallest outer diameter extends into the receiving groove 2224, the fourth pipe section 2232 with the second smallest outer diameter is interference-fitted with the inner wall of the valve body 21, and the fifth pipe section 2233 with the largest outer diameter extends into the pressure relief channel and fits against the inner wall of the pressure reducing valve body 10, so as to improve the sealing performance of the end of the actuator 22 near the pressure relief channel.

[0064] exist Figure 6 In the specific embodiment shown, the fifth pipe segment 2233 is located outside the connector 23. A gas guide hole 2234 is provided at the end of the fifth pipe segment 2233 furthest from the first exhaust port 211. The diameter of the gas guide hole 2234 gradually decreases in the direction towards the first exhaust port 211. In this way, the gas in the pressure relief channel can be guided through the gas guide hole 2234 during pressure relief via the safety valve 20, improving the guiding effect and increasing the pressure relief efficiency.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0067] In the description of this invention, "a plurality of" means two or more.

[0068] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0069] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pressure reducing valve assembly, characterized in that, include: The pressure reducing valve body (10) has a pressure relief channel inside, and the two ends of the pressure reducing valve body (10) are respectively provided with an air inlet and an air outlet that are connected to the pressure relief channel. A safety valve (20) includes a valve body (21) and an actuator (22). One end of the valve body (21) has a connector (23), and the other end of the valve body (21) has a first vent (211) communicating with the atmosphere. The connector (23) is connected to the pressure reducing valve body (10). The actuator (22) is disposed within the valve body (21) and is adapted to selectively connect the first vent (211) with the pressure relief channel. The execution component (22) includes: A movable seat (222) is slidably disposed within the valve body (21); A fixing seat (223) is fixed to the connector (23); A gasket (224) is disposed between the movable seat (222) and the fixed seat (223); In the direction away from the valve body (21), the fixing seat (223) includes: a third pipe section (2231), a fourth pipe section (2232), and a fifth pipe section (2233) connected in sequence with gradually increasing outer diameters, wherein the fourth pipe section (2232) and the fifth pipe section (2233) are fixed to the connector (23); the end face of the fifth pipe section (2233) near the third pipe section (2231) abuts against the connector (23); The movable seat (222) includes a second tube segment (2222), which is hollow to define a receiving groove (2224). The gasket (224) is disposed within the receiving groove (2224) and is interference-fitted with the receiving groove (2224). The outer diameter of the third pipe section (2231) is smaller than the inner diameter of the receiving groove (2224) and extends into the receiving groove (2224) to push against the gasket (224); the outer wall of the fourth pipe section (2232) is interference-fitted with the inner wall of the valve body (21); the end face of the fourth pipe section (2232) is spaced apart from the end face of the second pipe section (2222).

2. The pressure reducing valve assembly according to claim 1, characterized in that, The connector (23) is constructed as a snap-fit ​​connector or a threaded connector.

3. The pressure reducing valve assembly according to claim 2, characterized in that, A connecting block (11) is provided on the outer peripheral wall of the pressure reducing valve body (10). A bypass hole (12) communicating with the pressure relief channel is provided in the connecting block (11). The connector (23) is engaged with the bypass hole (12) by snapping or threading.

4. The pressure reducing valve assembly according to claim 3, characterized in that, The bypass hole (12) is provided with a sealing hole (13) at one end facing the valve body (21). The diameter of the sealing hole (13) gradually increases in the direction away from the bypass hole (12). A sealing element (30) is provided between the connecting block (11) and the connector (23). The sealing element (30) is interference-fitted with the sealing hole (13).

5. The pressure reducing valve assembly according to claim 3, characterized in that, An annular baffle (24) is provided inside the valve body (21), and the actuating component (22) pushes against the side wall of the annular baffle (24) facing the bypass hole (12).

6. The pressure reducing valve assembly according to claim 5, characterized in that, The execution component (22) includes: An elastic element (221) is provided, one end of which abuts against the annular baffle (24); the other end of which abuts against the movable seat (222). The gasket (224) is adapted to push the movable seat (222) away from the fixed seat (223) under pressure so that the first vent (211) communicates with the bypass hole (12).

7. The pressure reducing valve assembly according to claim 6, characterized in that, The movable seat (222) further includes a first pipe section (2221) that slides with the inner wall of the valve body (21), and at least part of the outer diameter of the second pipe section (2222) is smaller than the outer diameter of the first pipe section (2221) to define a first gas passage (a) with the inner wall of the valve body (21), and the gas in the bypass hole (12) is adapted to be discharged through the first gas passage (a).

8. The pressure reducing valve assembly according to claim 7, characterized in that, The second pipe section (2222) is provided with a plurality of second exhaust holes (2223) in the circumferential direction. The first pipe section (2221) is hollow to define a second gas passage (b) that communicates with the first exhaust hole (211). One end of the second exhaust hole (2223) is connected to the first gas passage (a), and the other end of the first exhaust hole (211) is connected to the second gas passage (b).

9. The pressure reducing valve assembly according to claim 8, characterized in that, The receiving groove (2224) is spaced apart from the second exhaust hole (2223).

10. The pressure reducing valve assembly according to claim 9, characterized in that, The receiving tank (2224) is connected to the second gas passage (b) through the third exhaust port (2225).

11. The pressure reducing valve assembly according to claim 1, characterized in that, The fifth pipe segment (2233) is located outside the connector (23). A gas guide hole (2234) is provided at the end of the fifth pipe segment (2233) away from the first exhaust hole (211). The diameter of the gas guide hole (2234) gradually decreases in the direction toward the first exhaust hole (211).

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