Cartridge pressure reducing valve

Abstract

This application relates to a cartridge-type pressure reducing valve. A pressure regulating valve cover is connected to the valve body. A gasket and a pressure regulating valve spring are disposed within the valve cover cavity of the pressure regulating valve cover. The first end of the pressure regulating valve spring is connected to the gasket, and the second end is connected to a diaphragm assembly. A regulating valve rod is adjustablely disposed on the pressure regulating valve cover, with one end passing through the cover and connected to the gasket. The valve body has a spring groove, a gas inlet, and a gas outlet. A valve core is disposed within the valve body, and the valve core has a low-pressure chamber and a valve port connecting to the low-pressure chamber. The low-pressure chamber connects to the gas outlet and, through the valve port, connects to the gas inlet. One end of a preload spring is inserted into the spring groove, and the other end is connected to a rubber-coated valve rod. The rubber-coated valve rod movably passes through the valve port and, under the combined action of the gas preset pressure and the preload spring, abuts against the valve core to close the valve port. The diaphragm assembly is configured to change the distance between the rubber-coated valve rod and the valve port under force to open the valve port. This design reduces the number of assembly parts and has the advantages of simple structure and high assembly efficiency.

Description

Technical Field

[0001] This application relates to the field of pressure reducing valves, and in particular to cartridge pressure reducing valves. Background Technology

[0002] Traditional cartridge-type pressure reducing valves use a star-shaped sealing ring and valve stem for sealing. During assembly, the star-shaped sealing ring is prone to deformation due to the tight compression of its end face, leading to gas leakage from the high-pressure area to the low-pressure area. This results in poor product performance, affecting product yield and production efficiency. Furthermore, traditional cartridge-type pressure reducing valves use a threaded connection to fix the diaphragm, with the valve stem pressing against the diaphragm seat. This can easily cause the threads to loosen when the valve stem moves axially, resulting in poor diaphragm sealing and gas leakage to the outside of the pressure reducing valve body.

[0003] Specifically, traditional cartridge pressure reducing valves, such as Figure 1 As shown, its sealing components mainly include a pressure reducing valve core 640, a star-shaped sealing ring 650, and a valve stem 660. The specific sealing method is that the star-shaped sealing ring 650 seals with the valve stem 660. The star-shaped sealing ring 650, which is assembled with an interference fit, is installed into the bottom groove of the pressure reducing valve core 640. When the pressure reducing valve core 640 is assembled into the pressure reducing valve body 630 by means of a threaded connection, the rotation of the pressure reducing valve core 640 presses the end face of the star-shaped sealing ring 650 tightly. However, this assembly method is prone to deforming the star-shaped sealing ring 650, which affects the sealing between the star-shaped sealing ring 650 and the valve stem 660. In traditional cartridge-type pressure reducing valves, the diaphragm 610 is fixed by a threaded connection between the diaphragm cover 600 and the diaphragm seat 620. The valve stem 660 presses against the diaphragm seat 620 that fixes the diaphragm 610. When the valve stem 660 moves axially, the threads are prone to loosening, resulting in poor sealing of the diaphragm 610 and gas leakage to the outside of the pressure reducing valve.

[0004] Therefore, the first-time pass rate of leakage tests on assembled products is low, and performance needs to be tested again after reassembly; however, reassembly may damage the star-shaped seal, resulting in high production material and labor costs. Utility Model Content

[0005] Therefore, it is necessary to provide a cartridge-type pressure reducing valve.

[0006] In one embodiment, a cartridge-type pressure reducing valve includes an adjusting valve stem, a nut, a pressure regulating valve cover, a gasket, a pressure regulating valve spring, a valve core, a rubber-coated valve stem, a preload spring, a valve body, and a diaphragm assembly.

[0007] The pressure regulating valve cover is connected to the valve body. The gasket and the pressure regulating valve spring are disposed in the valve cover cavity of the pressure regulating valve cover. The first end of the pressure regulating valve spring is connected to the gasket, and the second end is connected to the diaphragm assembly. The regulating valve rod is adjustablely disposed on the pressure regulating valve cover by the nut, and one end of the regulating valve rod passes through the pressure regulating valve cover and is connected to the gasket.

[0008] The valve body is provided with a spring groove, a gas inlet and a gas outlet; the valve core is disposed in the valve body, the valve core is provided with a low-pressure chamber and a valve port communicating with the low-pressure chamber, the low-pressure chamber is communicating with the gas outlet and is also communicating with the gas inlet through the valve port;

[0009] One end of the preload spring is inserted into the spring groove, and the other end is connected to the rubber-coated valve stem;

[0010] The rubber-coated valve stem can be movably passed through the valve port and is used to abut against the valve core to close the valve port under the combined action of the preset gas pressure and the pre-compression spring.

[0011] The diaphragm assembly is configured to change the distance between the coated valve stem and the valve port under force, thereby opening the valve port.

[0012] The aforementioned cartridge-type pressure reducing valve, through the coordination of the valve stem, nut, pressure regulating valve cover, gasket, pressure regulating valve spring, valve core, rubber-coated valve stem, preload spring, valve body, and diaphragm assembly, reduces the number of assembly parts compared to traditional cartridge-type pressure reducing valves with star-shaped sealing rings. This results in advantages such as simple structure and high assembly efficiency, reducing production materials and labor costs. Furthermore, the relative sealing relationship between the valve core orifice and the rubber-coated valve stem is unaffected by assembly, leading to a high first-pass rate for leakage tests after assembly, and even achieving 100% yield in a single assembly, thereby greatly improving the performance yield of the finished product.

[0013] In some embodiments, the pressure regulating valve cover is detachably assembled with the valve body and forms an regulating cavity for accommodating the diaphragm assembly.

[0014] In some embodiments, the regulating valve stem adjusts the position of the diaphragm assembly in the regulating cavity by threading.

[0015] In some embodiments, the regulating valve stem is threadedly connected to the pressure regulating valve cover.

[0016] In some embodiments, the diaphragm assembly includes a first abutment portion, a second abutment portion, and a diaphragm;

[0017] The first abutting part abuts against the second end of the pressure regulating valve spring. The edge of the diaphragm is sandwiched between the pressure regulating valve cover and the valve body, and the center of the diaphragm is sandwiched between the first abutting part and the second abutting part. The diaphragm is used to drive the second abutting part to push the rubber-coated valve rod to change the distance of the rubber-coated valve rod relative to the valve port when the regulating valve rod applies pressure to the first abutting part through the pressure regulating valve spring.

[0018] In some embodiments, the valve core is threadedly connected within the valve body.

[0019] In some embodiments, the rubber-coated valve stem is sealed to the valve core at one end near the diaphragm assembly via a first sealing ring; the valve core is sealed to the valve body at the outside of the low-pressure chamber communicating with the gas outlet via a second sealing ring and a third sealing ring; the cartridge-type pressure reducing valve is further provided with a fourth sealing ring at the end of the valve body near the gas inlet for sealing the valve body.

[0020] In some embodiments, the valve body is provided with a throttling orifice, and the gas outlet is connected to the regulating chamber through the throttling orifice.

[0021] In some embodiments, the seal between the rubber-coated valve stem and the valve port in the valve core configuration is a conical seal.

[0022] In some embodiments, the rubber-coated valve stem is provided with a V-shaped rubber-coated conical surface. Under the combined action of a certain gas pressure and the preload spring, the V-shaped rubber-coated conical surface abuts against the valve core to close the valve port. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a traditional cartridge-type pressure reducing valve.

[0025] Figure 2 This is a schematic diagram of an embodiment of the cartridge-type pressure reducing valve described in this application.

[0026] Figure 3 for Figure 2 An exploded view of the embodiment shown.

[0027] Figure 4 for Figure 2A partial enlarged structural diagram of the embodiment shown.

[0028] Figure 5 for Figure 2 An enlarged schematic diagram of the diaphragm assembly in the embodiment shown.

[0029] Reference numerals: cartridge-type pressure reducing valve 100, regulating valve stem 10, nut 11, pressure regulating valve cover 12, gasket 13, pressure regulating valve spring 14, diaphragm 15, first abutment part 16, second abutment part 17, valve core 18, valve port 181, rubber-coated valve stem 19, V-shaped rubber-coated cone surface 191, bottom surface 192, preload spring 20, valve body 21, spring groove 211, gas inlet 212, gas outlet 213, throttling orifice 214, sealing ring groove 215, fourth sealing ring 22, third sealing ring 23, second sealing ring 24, first sealing ring 25, low-pressure chamber 26, regulating chamber 27, valve cover chamber 28, diaphragm assembly 29, high-pressure chamber 30, diaphragm top cover 600, diaphragm 610, diaphragm seat 620, pressure reducing valve body 630, pressure reducing valve core 640, star-shaped sealing ring 650, valve stem 660. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0035] This application discloses a cartridge-type pressure reducing valve, which includes some or all of the technical features of the following embodiments; that is, the cartridge-type pressure reducing valve includes some or all of the following structures. In one embodiment of this application, a cartridge-type pressure reducing valve includes an adjusting valve stem, a nut, a pressure regulating valve cover, a gasket, a pressure regulating valve spring, a valve core, a rubber-coated valve stem, a preload spring, a valve body, and a diaphragm assembly; the pressure regulating valve cover is connected to the valve body, the gasket and the pressure regulating valve spring are disposed in the valve cover cavity of the pressure regulating valve cover, the first end of the pressure regulating valve spring is connected to the gasket, the second end is connected to the diaphragm assembly, the adjusting valve stem is adjustablely disposed on the pressure regulating valve cover by the nut, and one end of the adjusting valve stem passes through the pressure regulating valve cover and is connected to the gasket; the valve body is provided with a spring. The valve body includes a gas inlet, a gas outlet, and a gas outlet. A valve core is disposed within the valve body, and the valve core has a low-pressure chamber and a valve port communicating with the low-pressure chamber. The low-pressure chamber communicates with the gas outlet and is connected to the gas inlet via the valve port. One end of a pre-compression spring is inserted into the spring groove, and the other end is connected to the rubber-coated valve stem. The rubber-coated valve stem movably passes through the valve port and is used to abut against the valve core to close the valve port under the combined action of a preset gas pressure and the pre-compression spring. The diaphragm assembly is configured to change the distance between the rubber-coated valve stem and the valve port under force to open the valve port. The aforementioned cartridge-type pressure reducing valve, through the adjustment of the valve stem, nut, pressure regulating valve cover, gasket, pressure regulating valve spring, valve core, rubber-coated valve stem, preload spring, valve body, and diaphragm assembly, reduces the number of assembly parts compared to traditional cartridge-type pressure reducing valves with star-shaped sealing rings. This results in a simpler structure, higher assembly efficiency, reduced production materials, and lower labor costs. Furthermore, the relative sealing relationship between the valve core's orifice and the rubber-coated valve stem is unaffected by assembly, leading to a high first-pass rate in leakage tests after assembly, and even achieving 100% yield on the first assembly, thus significantly improving the finished product's performance yield. The following section, in conjunction with the appendix... Figures 2 to 5 The cartridge-type pressure reducing valve will be described in detail.

[0036] In one embodiment, a cartridge-type pressure reducing valve 100 is as follows: Figure 2 and Figure 3As shown, it includes a regulating valve stem 10, a nut 11, a pressure regulating valve cover 12, a gasket 13, a pressure regulating valve spring 14, a valve core 18, a rubber-coated valve stem 19, a preload spring 20, a valve body 21, and a diaphragm assembly 29; the pressure regulating valve cover 12 is connected to the valve body 21, the gasket 13 and the pressure regulating valve spring 14 are disposed in the valve cover cavity 28 of the pressure regulating valve cover 12, the first end of the pressure regulating valve spring 14 is connected to the gasket 13, and the second end is connected to the diaphragm assembly 29, the regulating valve stem 10 is adjustablely disposed on the pressure regulating valve cover 12 by the nut 11, and one end of the regulating valve stem 10 passes through the pressure regulating valve cover 12 and is connected to the gasket 13; the valve body 21 is provided with a spring groove 211, a gas inlet 212, and Gas outlet 213; the valve core 18 is disposed in the valve body 21, the valve core 18 is provided with a low-pressure chamber 26 and a valve port 181 communicating with the low-pressure chamber 26, the low-pressure chamber 26 communicating with the gas outlet 213 and communicating with the gas inlet 212 through the valve port 181; one end of the preload spring 20 is inserted into the spring groove 211, and the other end is connected to the rubber-coated valve stem 19; the rubber-coated valve stem 19 movably passes through the valve port 181, and is used to abut against the valve core 18 to close the valve port 181 under the combined action of the gas preset pressure and the preload spring 20; the diaphragm assembly 29 is configured to change the distance of the rubber-coated valve stem 19 relative to the valve port 181 under force to open the valve port 181. The aforementioned cartridge-type pressure reducing valve 100, through the adjustment of the valve stem 10, nut 11, pressure regulating valve cover 12, gasket 13, pressure regulating valve spring 14, valve core 18, rubber-coated valve stem 19, preload spring 20, valve body 21, and diaphragm assembly 29, reduces the number of assembly parts compared to traditional cartridge-type pressure reducing valves with star-shaped sealing rings. This results in a simpler structure, higher assembly efficiency, reduced material consumption, and lower labor costs. Furthermore, the relative sealing relationship between the valve port 181 of the valve core 18 and the rubber-coated valve stem 19 is unaffected by assembly, ensuring a high first-pass rate for leakage tests after assembly. The yield rate is relatively high, and even 100% yield can be achieved in one assembly, which greatly improves the performance yield of the finished product. On the other hand, during the use of the cartridge pressure reducing valve 100, the pressure regulating valve cover 12 and the valve body 21 can remain stationary, which helps to avoid the problem of loosening of the threads at the diaphragm assembly of the diaphragm assembly 29, and thus effectively prevents gas from leaking from the diaphragm to the outside of the cartridge pressure reducing valve 100. On the other hand, the regulating valve stem 10 applies force to the diaphragm assembly 29 in sequence through the gasket 13 and the pressure regulating valve spring 14, so it is easy to adjust the pressure reducing effect of the cartridge pressure reducing valve 100 by adjusting the diaphragm assembly 29.

[0037] As an example, the spring groove 211 is located in a certain working environment. The preload spring 20 is connected to the spring groove 211 and the rubber-coated valve stem 19 respectively, and is used to apply elastic force between the spring groove 211 and the rubber-coated valve stem 19 under pressure. The rubber-coated valve stem 19 is disposed in the valve body 21. The regulating valve stem 10 is partially disposed in the pressure regulating valve cover 12 and partially located outside the pressure regulating valve cover 12, and is used to apply force to the rubber-coated valve stem 19 through the diaphragm assembly 29 under the action of external force.

[0038] In various embodiments, when needed, force can be applied to the regulating valve stem 10 from the outside, causing the diaphragm assembly 29 located in the pressure regulating valve cover 12 and the valve body 21 to undergo recoverable deformation, thereby acting on the rubber-coated valve stem 19 located in the valve body 21. The cartridge-type pressure reducing valve 100 is provided with a pressure regulating valve cover 12 adapted to the valve body 21. The pressure regulating valve cover 12 is detachably assembled with the valve body 21 and forms an adjusting cavity 27 for accommodating the diaphragm assembly 29. As an example, the pressure regulating valve cover 12 is fixed to the valve body 21 by screws and nuts. This structural design facilitates the assembly of the diaphragm assembly 29 and other structural components.

[0039] For example, the gas inlet 212 and the gas outlet 213 are connected through the low-pressure chamber 26 of the valve core 18. This structural design achieves pressure reduction when the gas inlet 212, the low-pressure chamber 26, and the gas outlet 213 are sequentially connected.

[0040] In each embodiment, the valve core 18 is disposed in the valve body 21. In one embodiment, the valve core 18 is threadedly connected to the pressure regulating valve cover 12. This structural design, through a coating process, encapsulates silicone onto the coated valve stem 19, forming a V-shaped coated conical surface 191. This is equivalent to eliminating the traditional star-shaped sealing ring of the pressure reducing valve, making the traditional star-shaped sealing ring and valve stem a whole, reducing the number of parts. That is, compared with the traditional cartridge-type pressure reducing valve with a star-shaped sealing ring, the number of assembly parts is reduced, which has the advantages of simple structure and high assembly efficiency, reduces production materials and lowers labor costs, and makes it easy to disassemble and assemble the valve core 18. It also has the advantages of simple structure and high assembly efficiency. Since the disassembly and assembly of the valve core 18 does not involve the traditional star-shaped sealing ring, the first-pass rate of leakage test of the assembled product is high.

[0041] In various embodiments, the valve core 18 is provided with a low-pressure chamber 26 and a valve port 181 communicating with the low-pressure chamber 26. The low-pressure chamber 26 is connected to the gas outlet 213 and is connected to the gas inlet 212 through the valve port 181. In one embodiment, such as Figure 2As shown, the rubber-coated valve stem 19 is sealed to the valve core 18 at its end near the diaphragm assembly 29 via a first sealing ring 25; the valve core 18 is sealed to the valve body 21 at the outer side of the low-pressure chamber 26 connecting to the gas outlet 213 via a second sealing ring 24 and a third sealing ring 23 respectively; the cartridge-type pressure reducing valve 100 also has a fourth sealing ring 22 at the end of the valve body 21 near the gas inlet 212 for sealing the valve body 21. This structural design helps to ensure the sealing performance of the cartridge-type pressure reducing valve 100 without affecting the disassembly and assembly of the valve core 18, and the relative sealing relationship between the valve port 181 of the valve core 18 and the rubber-coated valve stem 19 is not affected by the assembly. Therefore, the product leakage test has a high first-pass rate after assembly, and can even achieve 100% yield in one assembly, thereby greatly improving the finished product performance yield.

[0042] Exemplarily, the preload spring 20 is a spring, also known as a spring element, and functionally it can be called a support spring or preload spring, etc. Exemplarily, the first end of the preload spring 20 is connected to the spring groove 211, and the second end is connected to the rubber-coated valve stem 19; as an example, the second end of the preload spring 20 is connected to the bottom of the rubber-coated valve stem 19.

[0043] In various embodiments, the rubber-coated valve stem 19 movably passes through the valve port 181 and is used to abut against the valve core 18 to close the valve port 181 under the combined action of the gas preset pressure and the preload spring 20. Exemplarily, the rubber-coated valve stem 19 has a stop end adjacent to or abutting against the diaphragm assembly 29. As an example, under the action of an external force, the diaphragm assembly 29 moves towards the stop end of the rubber-coated valve stem 19 to abut against the stop end, or directly abuts against the stop end, and then pushes the rubber-coated valve stem 19 towards the valve port 181, that is, pushes the rubber-coated valve stem 19 away from the force-bearing position of the regulating valve stem 10. It can be understood that the gas preset pressure is the design target for gas pressure. When the gas pressure rises to a certain level, under the combined action of the gas preset pressure and the preload spring 20, the rubber-coated valve stem 19 moves relative to the valve port 181, contacting the valve core 18 at the valve port 181, thereby closing the valve port 181.

[0044] To ensure the sealing effect of the rubber-coated valve stem 19 on the valve port 181, in one embodiment, the rubber-coated valve stem 19 seals the valve port 181 by abutting the valve core 18 with its conical surface. Exemplarily, the rubber-coated valve stem 19 seals the valve port 181 by abutting the valve core 18 with its conical surface. In one embodiment, the rubber-coated valve stem 19 has a V-shaped rubber-coated conical surface 191. Under the combined action of a preset gas pressure and the preload spring 20, the V-shaped rubber-coated conical surface 191 abuts the valve core 18 to seal the valve port 181. Exemplarily, under the combined action of a certain gas pressure and the preload spring 20, that is, under the combined action of a preset value, such as a preset threshold gas pressure and the preload spring 20, the V-shaped rubber-coated conical surface 191 abuts the valve core 18 to seal the valve port 181. This structural design is simple and direct, while ensuring a sealing effect on the valve port 181.

[0045] In each embodiment, the regulating valve stem 10, through the adjustment of the diaphragm assembly 29, pushes the rubber-coated valve stem 19 to open the valve port 181. That is, the regulating valve stem 10, by adjusting the diaphragm assembly 29 therein, causes the diaphragm assembly 29 to push the rubber-coated valve stem 19, thereby opening the valve port 181.

[0046] To facilitate adjustment of the diaphragm assembly 29, in one embodiment, the gasket 13 and the pressure regulating valve spring 14 are disposed in the valve cover cavity 28 of the pressure regulating valve cover 12. The first end of the pressure regulating valve spring 14 is connected to the gasket 13, and the second end is connected to the diaphragm assembly 29. The regulating valve rod 10 is adjustablely disposed on the pressure regulating valve cover 12 by the nut 11, and one end of the regulating valve rod 10 passes through the pressure regulating valve cover 12 and is connected to the gasket 13, while the other end is located outside the pressure regulating valve cover 12 to facilitate force application.

[0047] To facilitate control of the position of the regulating valve stem 10, in one embodiment, the regulating valve stem 10 adjusts the position of the diaphragm assembly 29 by screwing it in. In one embodiment, the regulating valve stem 10 is threadedly connected to the pressure regulating valve cover 12. Directly rotating the regulating valve stem 10 causes it to screw into the pressure regulating valve cover 12, gradually penetrating it. The cartridge-type pressure reducing valve 100 also includes a nut 11, which is threadedly connected to the regulating valve stem 10. As an example, the nut 11 is used to screw the regulating valve stem 10 in until the desired state is reached, then lock the nut 11 to prevent further movement of the regulating valve stem 10 and maintain the adjusted desired state. Alternatively, in one embodiment, the regulating valve stem 10 is threadedly connected to the pressure regulating valve cover 12; and the cartridge-type pressure reducing valve 100 also includes a nut 11, which is threadedly connected to the regulating valve stem 10. Other embodiments follow the same principle and will not be described in detail. In this way, the regulating valve stem 10 applies force to the first end of the pressure regulating valve spring 14 through the gasket 13, and the pressure regulating valve spring 14 applies force to the diaphragm assembly 29 through its second end, thereby helping to protect the diaphragm assembly 29, especially the diaphragm 15 therein.

[0048] To protect the diaphragm assembly 29, especially the diaphragm 15 therein, in one embodiment, the diaphragm assembly 29 includes a first abutment portion 16, a second abutment portion 17, and a diaphragm 15. The first abutment portion 16 abuts against the second end of the pressure regulating valve spring 14. The edge of the diaphragm 15 is sandwiched between the pressure regulating valve cover 12 and the valve body 21, and the center of the diaphragm 15 is sandwiched between the first abutment portion 16 and the second abutment portion 17. The diaphragm 15 is used to drive the second abutment portion 17 to push the rubber-coated valve rod 19 to change the distance of the rubber-coated valve rod 19 relative to the valve port 181 when the regulating valve rod 10 applies pressure to the first abutment portion 16 through the pressure regulating valve spring 14, thereby opening the valve port 181. In this embodiment, the diaphragm 15 can also be referred to as an elastic diaphragm. For example, as shown... Figure 2 and Figure 4 As shown, the diaphragm 15 is connected to the valve body 21 by elastic compression and folding, that is, it has a certain elastic deformation state after installation to obtain initial elastic force, which helps to improve the positional stability of the diaphragm 15.

[0049] In order to balance the air pressure of the environment in which the diaphragm assembly 29, especially the diaphragm 15 therein, is located, in one embodiment, such as Figure 2As shown, the valve body 21 is provided with an adjustment chamber 27, and the diaphragm assembly 29 is disposed in the adjustment chamber 27; as an example, the adjustment chamber 27 is formed between the pressure regulating valve cover 12 and the valve body 21. The valve body 21 is provided with a throttling orifice 214, and the gas outlet 213 is connected to the adjustment chamber 27 through the throttling orifice 214. With this structural design, after pressure reduction, the gas can sequentially enter the adjustment chamber 27 through the gas outlet 213 and the throttling orifice 214, thereby balancing the air pressure of the environment where the rubber-coated valve stem 19 and the diaphragm 15 are located, so that the high-pressure environment does not affect the position adjustment of the regulating valve stem 10 on the diaphragm assembly 29, nor does it affect the shape change adjustment of the diaphragm assembly 29 itself.

[0050] Below is another specific application example, combined with... Figures 2 to 5 In one embodiment, during installation, the preload spring 20 is first inserted into the bottom of the rubber-coated valve stem 19; then, the first sealing ring 25, the second sealing ring 24, and the third sealing ring 23 are installed on the valve core 18, and the rubber-coated valve stem 19 is inserted into the center hole of the valve core 18; then, the valve core 18 is installed into the valve body 21 by means of a threaded connection, and the preload spring 20 abuts against the spring groove 211 of the valve body 21; then, a diaphragm assembly including a diaphragm 15, a first abutment portion 16, and a second abutment portion 17 is placed on the upper part of the valve body 21; then, the pressure regulating valve spring 14 is placed into the first abutment portion 16, and the gasket 13 is placed on the pressure regulating valve spring 14; then, the pressure regulating valve cover 12 and the valve body 21 are assembled together; finally, the adjusting member 11, such as a nut, is screwed into the adjusting valve stem 10, and then the adjusting valve stem 10 is screwed into the pressure regulating valve cover 12.

[0051] The cartridge-type pressure reducing valve 100 has at least two states. In one state, the regulating valve stem 10 is partially unscrewed from the pressure regulating valve cover 12, so that the pressure regulating valve spring 14 is not subjected to the force of the regulating valve stem 10; high-pressure gas acts on the bottom surface 192 of the rubber-coated valve stem 19 through the gas inlet 212, and with the force of the pre-compression spring 20, the rubber-coated valve stem 19 moves upward. At this time, the V-shaped rubber-coated conical surface 191 of the rubber-coated valve stem 19 and the valve port 181 of the valve core 18 are sealed, preventing gas from entering the low-pressure chamber 26. At this time, the cartridge-type pressure reducing valve 100 has no gas output.

[0052] Another state can be called the working state. Rotate the regulating valve stem 10 and screw it into the pressure regulating valve cover 12. Through the cooperation of the gasket 13 and the pressure regulating valve spring 14, the diaphragm assembly 29, which includes the diaphragm 15, the first abutment part 16 and the second abutment part 17, moves towards the rubber-coated valve stem 19, thereby pushing the rubber-coated valve stem 19 to move, causing the rubber-coated cone surface 191 to disengage from the valve port 181. At this time, gas enters the low-pressure chamber 26 and is output from the gas outlet 213. When the gas pressure of the cartridge-type pressure reducing valve 100 is output, the output gas enters the regulating chamber 27 through the throttling orifice 214 on the valve body 21. The gas pressure acts on the diaphragm 15 and the second abutment part 17 and is transmitted to the pressure regulating valve spring 14, providing real-time feedback on the output pressure. This keeps the cartridge-type pressure reducing valve 100 in a state of dynamic adjustment. Continue to screw the regulating valve stem 10 in until the pressure value output by the pressure regulating valve spring 14 reaches the required value. When the diaphragm assembly 29 is subjected to the force of the rubber-coated valve stem 19 and the gas entering the regulating chamber 27 through the throttling orifice 214, the volume of the valve cover chamber 28 decreases, and the gas in the valve cover chamber 28 can be discharged into the atmosphere in a timely manner through the exhaust port 121, thus avoiding the formation of a dead cavity in the valve cover chamber 28, which would affect the real-time feedback of the output gas.

[0053] As an example, a press-fitting method is used, where a punch is used to press the top of the second abutment 17 to cause it to undergo plastic deformation, thereby achieving the function of clamping the diaphragm 15 between the first abutment 16 and the second abutment 17. Since the second abutment 17 undergoes plastic deformation, there will be no loosening, and the operation speed is fast, improving the production efficiency of the cartridge pressure reducing valve 100.

[0054] This design eliminates the traditional star-shaped sealing ring and valve stem assembly method. A rubber-coated V-shaped conical surface 191 is bonded to the surface of the coated valve stem 19 through a coating process, making the coated valve stem 19 and the V-shaped conical surface 191 a single unit. This avoids the assembly and performance problems caused by deformation of the star-shaped sealing ring during assembly, as is common with traditional star-shaped sealing rings. Furthermore, this embodiment reduces the number of assembly parts, offering advantages such as simple structure and high assembly efficiency, reducing production materials and labor costs. The relative sealing relationship between the valve port 181 of the valve core 18 and the coated valve stem 19 is unaffected by assembly, resulting in a high first-pass yield rate for leakage tests after assembly, even achieving 100% yield on the first assembly, thus significantly improving the finished product's performance yield. Moreover, the seal between the coated valve stem 19 and the valve port 181 of the valve core 18 is a conical seal, resulting in relatively lower flow resistance compared to traditional pressure reducing valves, thus ensuring stable low-pressure and high-flow output of the cartridge-type pressure reducing valve 100.

[0055] The following is a specific application example. The valve port 181 of the valve core 18 is closed and opened through the rubber-coated valve stem 19. Therefore, it is not affected by the assembly of the valve core 18 and the valve body 21, and can achieve 100% yield in one assembly. On this basis, the performance yield of the final product is greatly improved. The specific working principle of the cartridge-type pressure reducing valve 100 is explained below.

[0056] When high-pressure gas enters the valve body 21 through the gas inlet 212, the gas pressure itself, plus the preload of the preload spring 20, pushes the rubber-coated valve stem 19 to move towards the closed valve port 181. The V-shaped rubber-coated cone surface 191 on the rubber-coated valve stem 19 is squeezed against the valve port 181 of the valve core 18. At this time, the rubber-coated valve stem 19 and the valve port 181 of the valve core 18 are in a sealed state, and the cartridge pressure reducing valve 100 has no gas output.

[0057] When pressure reduction is required, rotating the regulating valve stem 10 compresses the pressure regulating valve spring 14 inside the cartridge-type pressure reducing valve 100, causing the diaphragm assembly 29 to push the rubber-coated valve stem 19 until the V-shaped rubber-coated cone surface 191 on the rubber-coated valve stem 19 disengages from the valve port 181 of the valve core 18. At this time, the gas inlet 212 and the gas outlet 213 of the cartridge-type pressure reducing valve 100 are connected, that is, the inlet port and the outlet port are connected. At this time, the gas enters the low-pressure chamber 26 through the gap between the V-shaped rubber-coated cone surface 191 of the rubber-coated valve stem 19 and the valve port 181 of the valve core 18, and then flows out of the gas outlet 213.

[0058] By adjusting the position of the diaphragm assembly 29 through the valve stem 10, the output pressure of the cartridge-type pressure reducing valve 100 can be set, i.e., adjusted, so that the gas output pressure of the cartridge-type pressure reducing valve 100 reaches the working pressure requirement. The gas outlet 213 of the valve body 21 has a throttling orifice 214, or is connected to a throttling orifice 214; the gas output from the cartridge-type pressure reducing valve 100 enters the regulating chamber 27 through this orifice. When the output pressure is higher than the set pressure, the gas pressure entering the regulating chamber 27 pushes the diaphragm assembly 29, especially the diaphragm 15 therein. The pressure regulating valve spring 14 moves in the opposite direction to the elastic force of the regulating valve, that is, it moves towards the regulating valve stem 10. At this time, the gap between the V-shaped tapered surface 191 of the rubber-coated valve stem 19 and the valve port 181 of the valve core 18 decreases, the gas flow resistance increases, and the output pressure decreases. When the output pressure is lower than the set pressure, the pressure regulating valve spring 14 pushes the diaphragm assembly 29 to move in the opposite direction to the gas pressure, that is, towards the rubber-coated valve stem 19, thereby increasing the gap between the V-shaped tapered surface of the rubber-coated valve stem 19 and the valve port 181 of the valve core 18, decreasing the gas flow resistance, and increasing the output pressure.

[0059] In this way, the gas output from the cartridge pressure reducing valve 100 is dynamically fed back to the diaphragm 15 through the throttling orifice 214, so that the cartridge pressure reducing valve 100 is always in a dynamic adjustment state. In addition, the seal between the rubber-coated valve stem 19 and the valve port 181 of the valve core 18 is a conical seal design, which has the advantage of relatively low flow resistance compared with other sealing methods, thereby ensuring the stable output of the cartridge pressure reducing valve 100 with low pressure and high flow.

[0060] Below is another specific application example, combined with... Figure 2 , Figure 3 , Figure 4 and Figure 5 In the cartridge-type pressure reducing valve 100, the regulating valve stem 10 and the pressure regulating valve cover 12 are connected by threads, and the stem is screwed in and out of the pressure regulating valve cover 12 to compress the pressure regulating valve spring 14.

[0061] Nut 11 is used to lock the regulating valve stem 10 after adjusting the output pressure value, ensuring that the regulating valve stem will not loosen and affect the output pressure value.

[0062] The pressure regulating valve cover 12 is used to assemble with the valve body 21 to press the diaphragm 15. The pressure regulating valve cover 12 is provided with an exhaust hole 121. When the pressure regulating valve spring 14 is compressed, the gas between the pressure regulating valve cover 12 and the diaphragm 15 is discharged, which avoids the formation of a dead cavity between the pressure regulating valve cover 12 and the diaphragm 15, thus affecting the pressure regulation.

[0063] The gasket 13 is used to apply pressure to the pressure regulating valve spring 14 when adjusting the regulating valve stem 10.

[0064] The pressure regulating valve spring 14 is used to balance the preload of the preload spring 20 and the input gas pressure.

[0065] The diaphragm 15 is press-fitted between the pressure regulating valve cover 12 and the valve body 21 to prevent gas between the valve body 21 and the diaphragm 15 from leaking to the outside of the pressure regulating valve.

[0066] The first abutment portion 16 and the second abutment portion 17 cooperate to fix the diaphragm 15 and the pressure regulating valve spring 14. The compressive force is applied to the second abutment portion 17. The second abutment portion 17 and the first abutment portion 16 cooperate to fix the diaphragm 15 and the diaphragm cover. The force received is applied to the rubber-coated valve stem 19. As an example, the first abutment portion 16 is the diaphragm cover, and the second abutment portion 17 is the diaphragm seat.

[0067] The valve body 21 is inserted into the valve seat. The valve body 21 has a gas inlet 212, a mounting groove 215, a gas outlet 213, and a throttling orifice 214. The throttling orifice 214 communicates with the gas outlet. When gas is depressurized and output through the pressure reducing valve, the output gas passes through the throttling orifice 214 into the cavity between the diaphragm 15 and the valve body 21, acting on the diaphragm 15 to keep the pressure regulating valve in a dynamic adjustment state. The fourth sealing ring 22 is fitted onto the mounting groove 215.

[0068] The fourth sealing ring 22 is used to isolate the high-pressure area of ​​the gas input and the low-pressure area of ​​the gas output, preventing gas from flowing to the gas output port 213 without passing through the gas input port 212, which could cause the pressure reducing valve to fail.

[0069] The preload spring 20 is installed in the spring groove 211 at the bottom of the valve body 21 and is used to apply preload force to the rubber-coated valve stem 19.

[0070] The rubber-coated valve stem 19 is subjected to the force of the pressure regulating valve spring 14, the pre-compression spring 20 and the gas pressure, which changes the size of the gap between the silicone surface and the valve core 18. The rubber-coated valve stem 19 has a V-shaped rubber-coated conical surface 191 coated by injection molding.

[0071] The valve core 18 is installed into the valve body 21 via a threaded connection. The rubber-coated valve stem 19 is assembled inside the internal cavity. When the valve port 181 and the V-shaped rubber-coated cone surface 191 are sealed, the pressure reducing valve has no gas output.

[0072] The third sealing ring 23 is used to prevent gas from entering the gas outlet 213 through the gap between the valve body 21 and the bottom of the valve core 18, so as to avoid the pressure regulating valve from failing to regulate pressure.

[0073] The second sealing ring 24 is used to prevent the valve core 18 from tilting inside the valve body 21, which would cause the third sealing ring 23 to fail and gas to enter the cavity formed by the diaphragm 15 and the valve body 21 through the gap between the valve body 21 and the bottom of the valve core 18.

[0074] The following is a specific application example illustrating the assembly method of the cartridge-type pressure reducing valve 100. In one embodiment, the first step is to assemble the third sealing ring 23 and the second sealing ring 24 onto the valve core 18, and to assemble the first sealing ring 25 and the preload spring 20 onto the rubber-coated valve stem 19; the second step is to insert the rubber-coated valve stem 19 into the high-pressure chamber 30 of the valve core 18; the third step is to assemble the fourth sealing ring 22 onto the valve body 21. The fourth sealing ring 22 isolates the high-pressure gas from the inlet, i.e., the gas input port 212, so that it flows out from the outlet, i.e., the gas outlet 213, without passing through the valve port 181.

[0075] Assemble the completed structure from step three into the valve body 21, inserting one end of the preload spring 20 into the spring groove 211. Since the assembly method involves the valve core 18 being screwed into the valve body 21 (similar to a screw and nut connection), tightening it maintains their positional relationship. At this point, the valve core 18 and valve body 21 become a single unit and cannot move relative to each other. The preload spring 20 supports the rubber-coated valve stem 19 to move axially upwards. At this time, the V-shaped rubber-coated conical surface 191 contacts the valve port 181. Figure 3 As shown, the rubber-coated valve stem 19 cannot move further upward. That is, in... Figure 2As shown, the rubber-coated valve stem 19 cannot move further to the left. Press the top of the rubber-coated valve stem 19, in Figure 3 As shown, the rubber-coated valve stem 19 can move downwards, while the valve core 18 and valve body 21 remain stationary. In practical applications, however, the pressing function is achieved through the diaphragm 15.

[0076] Then, the diaphragm assembly 29 is placed on the valve body 21, forming a pressure regulating chamber, or adjustment chamber 27, between the diaphragm 15 and the valve body 21. Next, the pressure regulating valve spring 14 and the gasket 13 are placed on the first abutment portion 16 of the diaphragm assembly 29. Then, the pressure regulating valve cover 12 is placed on the valve body 21, clamping the edge of the diaphragm 15 to prevent gas from escaping between the valve body 21 and the pressure regulating valve cover 12. This creates a cavity between the bottom surface of the diaphragm 15 and the valve body 21. For example, the diaphragm 15 is made of silicone rubber, which is deformable but does not leak gas.

[0077] Then screw the nut 11 onto the regulating valve stem 10. First, screw the regulating rod 10 in to achieve the ideal working state, then tighten the nut to prevent the regulating rod 10 from moving further, ensuring that the ideal pressure value can be output every time it is used. Next, screw the regulating valve stem 10 onto the pressure regulating valve cover 12. Tighten the regulating valve stem 10, and the regulating valve stem 10 moves downward, compressing the pressure regulating valve spring 14. The pressure regulating valve spring 14 acts on the diaphragm 15, and then on the rubber-coated valve stem 19. The rubber-coated valve stem 19 moves downward, and the valve port 181 and the V-shaped rubber-coated cone surface 191 of the rubber-coated valve stem 19 separate, allowing gas to enter the low-pressure chamber 26 of the cartridge-type pressure reducing valve 100.

[0078] The cartridge pressure reducing valve 100 is now assembled.

[0079] The use of the cartridge-type pressure reducing valve 100 is described below with reference to the above embodiments. In actual use, the cartridge-type pressure reducing valve 100 is inserted into a valve seat and locked. The valve seat can be understood as an environmental element, and the valve seat has an air inlet and an air outlet.

[0080] right Figure 2 In the embodiment shown, the adjusting valve stem 10 is turned, combined with... Figure 3 In the indicated direction, the regulating valve stem 10 moves downward, compressing the pressure regulating valve spring 14 through the gasket 13. The spring force acts on the rubber-coated valve stem 19 through the diaphragm assembly 29, causing the rubber-coated valve stem 19 to move downward. The V-shaped rubber-coated cone surface 191 of the rubber-coated valve stem 19 separates from the valve port 181, allowing gas to enter the low-pressure chamber 26. Continuously rotate the regulating valve stem 10 to the required output pressure, and tighten the nut 11 to prevent the regulating valve stem 10 from loosening.

[0081] During operation, the regulating valve stem 10 is rotated further into the pressure regulating valve cover 12. Through the gasket 13 and the pressure regulating valve spring 14, the diaphragm assembly 29 moves towards the rubber-coated valve stem 19, thereby pushing the rubber-coated valve stem 19 to move, causing the rubber-coated cone surface 191 to disengage from the valve port 181. At this time, gas enters the low-pressure chamber 26 and is output from the gas outlet 213. When the pressure reducing valve outputs gas pressure, the output gas enters the regulating chamber 27 through the throttling orifice 214 on the valve body 21. The gas pressure acts on the diaphragm 15 and the second abutment part 17 and is transmitted to the pressure regulating valve spring 14. At this time, the gas pressure acts on the bottom of the rubber-coated valve stem 19. With the force of the preload spring 20, the output pressure is fed back in real time, so that the cartridge pressure reducing valve 100 is always in a dynamic adjustment state. Continue to rotate the regulating valve stem 10 until the output pressure value of the cartridge pressure reducing valve 100 reaches the required level. When the diaphragm assembly 29 is subjected to the force of the rubber-coated valve stem 19 and the gas entering the cavity 27 through the throttling orifice 214, the volume of the valve cover cavity 28 decreases. The gas in the valve cover cavity 28 can be discharged into the atmosphere in a timely manner through the exhaust port 121, avoiding the formation of a dead cavity in the valve cover cavity 28, which would affect the real-time feedback of the output gas. In this way, during the entire working state of the cartridge pressure reducing valve 100, the rubber-coated valve stem 19, the preload spring 20, the diaphragm assembly 29, and the pressure regulating valve spring 14 are in dynamic motion, while other parts are in a stationary state.

[0082] The working principle of the cartridge-type pressure reducing valve 100 is explained below with reference to the above embodiments.

[0083] When gas enters the valve body 21 through the gas inlet 212, the gas pressure itself, plus the preload of the preload spring 20, pushes the rubber-coated valve stem 19 to move towards the closed valve port 181. The V-shaped rubber-coated cone surface 191 on the rubber-coated valve stem 19 is squeezed against the valve port 181 of the valve core 18. At this time, the rubber-coated valve stem 18 and the valve core 18 are in a sealed state, and the cartridge pressure reducing valve 100 has no gas output.

[0084] Rotating the regulating valve stem 10 compresses the pressure reducing valve spring 14, causing the second abutment part 17 to push the rubber-coated valve stem 19 until the V-shaped rubber-coated cone surface 191 on the rubber-coated valve stem 19 disengages from the valve port 181 of the valve core 18. At this time, the input and output ports of the cartridge-type pressure reducing valve 100 are connected, that is, the gas inlet 212 is connected to the gas outlet 213. Gas flows to the gas outlet 213 through the gap between the V-shaped rubber-coated cone surface 191 of the rubber-coated valve stem 19 and the valve port 181 of the valve core 18. The output pressure of the cartridge-type pressure reducing valve 100 is set by adjusting the valve stem 10, so that the gas output pressure of the cartridge-type pressure reducing valve 100 reaches the working pressure requirement. The valve body 21 is provided with a throttling orifice 214. The gas output from 100 enters the valve cover cavity 28 between the diaphragm 15 and the valve body 21. When the output pressure is higher than the set pressure, the gas pressure entering the valve cover cavity 28 pushes the diaphragm 15 and the second abutment 17 to move in the opposite direction of the spring force of the pressure regulating valve 14. The gap between the V-shaped rubber-coated cone surface 191 of the rubber-coated valve stem 19 and the valve port 181 of the valve core 18 decreases, the gas flow resistance increases, and the output pressure decreases. When the output pressure is lower than the set pressure, the pressure regulating valve spring 14 pushes the diaphragm 15 and the second abutment 17 to move in the opposite direction of the gas pressure. The gap between the V-shaped rubber-coated cone surface 191 of the rubber-coated valve stem 19 and the valve port 181 of the valve core 18 increases, the gas flow resistance decreases, and the output pressure increases.

[0085] The cartridge pressure reducing valve 100 outputs gas through the throttling orifice 214 to provide dynamic feedback to the diaphragm 15, so that the cartridge pressure reducing valve 100 is always in a dynamic adjustment state. In addition, the seal between the rubber-coated valve stem 19 and the valve port 181 of the valve core 18 is a conical seal, so the flow resistance is relatively small compared with the traditional pressure reducing valve, thereby ensuring the stable output of the cartridge pressure reducing valve 100 with low pressure and high flow.

[0086] It should be noted that other embodiments of this application also include a cartridge-type pressure reducing valve formed by combining the technical features of the above embodiments.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A cartridge-type pressure reducing valve (100), characterized in that, Includes regulating valve stem (10), nut (11), pressure regulating valve cover (12), gasket (13), pressure regulating valve spring (14), valve core (18), rubber-coated valve stem (19), preload spring (20), valve body (21) and diaphragm assembly (29). The pressure regulating valve cover (12) is connected to the valve body (21). The gasket (13) and the pressure regulating valve spring (14) are disposed in the valve cover cavity (28) of the pressure regulating valve cover (12). The first end of the pressure regulating valve spring (14) is connected to the gasket (13), and the second end is connected to the diaphragm assembly (29). The regulating valve rod (10) is adjustablely disposed on the pressure regulating valve cover (12) by the nut (11), and one end of the regulating valve rod (10) passes through the pressure regulating valve cover (12) and is connected to the gasket (13). The valve body (21) is provided with a spring groove (211), a gas inlet (212) and a gas outlet (213); the valve core (18) is disposed in the valve body (21), the valve core (18) is provided with a low-pressure chamber (26) and a valve port (181) communicating with the low-pressure chamber (26), the low-pressure chamber (26) is communicating with the gas outlet (213), and is communicating with the gas inlet (212) through the valve port (181); One end of the preload spring (20) is inserted into the spring groove (211), and the other end is connected to the rubber-coated valve stem (19). The rubber-coated valve stem (19) can be moved through the valve port (181) to abut against the valve core (18) to close the valve port (181) under the combined action of the gas preset pressure and the preload spring (20). The diaphragm assembly (29) is configured to change the distance of the overmolded valve stem (19) relative to the valve port (181) by force, so as to open the valve port (181).

2. The cartridge-type pressure reducing valve (100) according to claim 1, characterized in that, The pressure regulating valve cover (12) is detachably assembled with the valve body (21) and forms an regulating cavity (27) for accommodating the diaphragm assembly (29).

3. The cartridge pressure reducing valve (100) according to claim 2, characterized in that, The regulating valve stem (10) adjusts the position of the diaphragm assembly (29) in the regulating cavity (27) by screwing in the thread.

4. The cartridge-type pressure reducing valve (100) according to claim 3, characterized in that, The regulating valve stem (10) is threadedly connected to the pressure regulating valve cover (12).

5. The cartridge pressure reducing valve (100) according to claim 1, characterized by, The diaphragm assembly (29) includes a first abutting portion (16), a second abutting portion (17), and a diaphragm (15). The first abutment (16) abuts against the second end of the pressure regulating valve spring (14). The edge of the diaphragm (15) is sandwiched between the pressure regulating valve cover (12) and the valve body (21), and the center of the diaphragm (15) is sandwiched between the first abutment (16) and the second abutment (17). The diaphragm (15) is used to drive the second abutment (17) to push the rubber-coated valve rod (19) to change the distance of the rubber-coated valve rod (19) relative to the valve port (181) when the regulating valve rod (10) applies pressure to the first abutment (16) through the pressure regulating valve spring (14).

6. The cartridge pressure reducing valve (100) according to claim 1, characterized by, The valve core (18) is threadedly connected to the valve body (21).

7. The cartridge-type pressure reducing valve (100) according to claim 1, characterized in that, The rubber-coated valve stem (19) is sealed to the valve core (18) at one end near the diaphragm assembly (29) via a first sealing ring (25); the valve core (18) is sealed to the valve body (21) at the outside of the low-pressure chamber (26) which connects to the gas outlet (213) via a second sealing ring (24) and a third sealing ring (23); the cartridge pressure reducing valve (100) is also provided with a fourth sealing ring (22) at one end of the valve body (21) near the gas inlet (212) for sealing the valve body (21).

8. The cartridge-type pressure reducing valve (100) according to claim 2, characterized in that, The valve body (21) is provided with a throttling orifice (214), and the gas outlet (213) is connected to the regulating chamber (27) through the throttling orifice (214).

9. The cartridge pressure reducing valve (100) according to any one of claims 1 to 8, characterized in that The seal between the valve stem (19) and the valve core (18) is a conical seal.

10. The cartridge-type pressure reducing valve (100) according to claim 9, characterized in that, The rubber-coated valve stem (19) is provided with a V-shaped rubber-coated cone surface (191). Under the combined action of a certain gas pressure and the preload spring (20), the V-shaped rubber-coated cone surface (191) abuts against the valve core (18) to close the valve port (181).

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