Pressure reducing valve connecting structure and high-cleanliness diaphragm pressure reducing valve

Abstract

The utility model relates to the field of valves, and discloses a pressure reducing valve connecting structure and a high-cleanliness diaphragm pressure reducing valve, the pressure reducing valve connecting structure comprises a valve body and a sealing structure, the valve body is provided with an air inlet, an air outlet and a pressure measuring groove used for being connected with a pressure gauge, and the air inlet and the air outlet are both used for being connected with an external pipeline through threads in a matched mode; the external pipeline is provided with a bulge which is used for axially abutting against the air inlet and the air outlet when the external pipeline is in threaded screwing connection with the air inlet and the air outlet, and the bulge is used for sealing the air inlet and the air outlet under the extrusion action of the external pipeline; the pressure measuring groove is conical, the conical clamping sleeve is matched with the pressure measuring groove in shape, and the pressure measuring groove is connected and sealed with the pressure gauge through extrusion deformation of the conical clamping sleeve. The design does not need to depend on a raw material belt or other organic auxiliary sealing materials, sealing is directly achieved through mechanical extrusion, fiber chippings or residues possibly generated in the installation process are avoided, and therefore the cleanliness of the system is improved.

Description

Technical Field

[0001] This utility model belongs to the field of valves, specifically relating to a pressure reducing valve connection structure and a high-cleanliness diaphragm pressure reducing valve. Background Technology

[0002] Pressure reducing valves are widely used in many industrial fields such as petrochemicals, energy, metallurgy, pharmaceuticals, and food and beverage. In ultra-clean fields such as semiconductor integrated circuit manufacturing and biopharmaceuticals, where extremely high fluid cleanliness is required, the fluids transported are often ultrapure gases, electronic specialty gases, or high-purity chemical liquids. In these applications, even trace amounts of particulate contaminants, metal ion release, volatile organic compounds (VOCs), and even microorganisms in the fluid can have a significant impact on precision processes (such as photolithography, etching, and thin film deposition) or product quality. Therefore, extremely high requirements are placed on the ultra-cleanliness performance of fluid transport systems, including pressure reducing valves.

[0003] However, the pressure reducing valves currently used in the aforementioned high-cleanliness fields, whether conventional or partially labeled as "clean," still generally suffer from the following technical difficulties and defects, making it difficult to fully meet the stringent ultra-cleanliness requirements. For example, the connection between the inlet / outlet and the pipeline is often made using PTFE tape, which has insufficient sealing performance. In the transmission of high-purity or ultra-high-purity gases, it is difficult to completely prevent external air infiltration or internal gas micro-leakage, leading to the mixing of contaminants. This fails to meet the strict requirements for gas purity in high-cleanliness applications, and PTFE tape is prone to chemical precipitation, which also affects the cleanliness of the pressure reducing valve. Utility Model Content

[0004] In view of at least one of the above-mentioned defects or deficiencies in the prior art, the present invention provides a high-cleanliness diaphragm pressure reducing valve that achieves efficient sealing while improving cleanliness.

[0005] To achieve the above objectives, this utility model provides a pressure reducing valve connection structure, which includes:

[0006] The valve body has an air inlet, an air outlet, and a pressure measuring groove for connecting to a pressure gauge. The air inlet and the air outlet are both used to connect to an external pipeline via threaded connection. The external pipeline has a protrusion that abuts against the air inlet and the air outlet axially when the external pipeline is threadedly tightened to connect with the air inlet and the air outlet. The protrusion is used to seal the air inlet and the air outlet under the pressure of the external pipeline.

[0007] A conical ferrule, wherein the pressure measuring groove is conical, and the shape of the conical ferrule is adapted to the shape of the pressure measuring groove. The conical ferrule is used to form a sealed connection between the pressure gauge and the pressure measuring groove under the squeezing action of the pressure gauge and the pressure measuring groove.

[0008] In some embodiments, the pressure gauge has a first connecting portion, the tapered ferrule is disposed at the end of the first connecting portion and is used to extend into the pressure measuring groove, the pressure measuring groove has a second connecting portion, and the first connecting portion is used to be threadedly connected to the second connecting portion.

[0009] In some embodiments, the valve body is provided with a high-pressure chamber and a low-pressure chamber, and the pressure measuring groove is divided into a first pressure measuring groove and a second pressure measuring groove. The high-pressure chamber is connected to the air inlet through the first pressure measuring groove, and the low-pressure chamber is connected to the air outlet through the second pressure measuring groove.

[0010] In some embodiments, the sealing surface between the external pipe and the air inlet and the air outlet is a first sealing surface, and the roughness Ra of the first sealing surface is ≤0.1μm.

[0011] The second aspect of this utility model provides a high-cleanliness diaphragm pressure reducing valve, including the pressure reducing valve connection structure described in any one of the above claims.

[0012] In some embodiments, the high-cleanliness diaphragm pressure reducing valve includes:

[0013] A valve cover is connected to the valve body. An adjusting nut is connected to the top of the valve cover. A return spring is provided inside the valve cover. The upper end of the return spring abuts against the adjusting nut.

[0014] A diaphragm assembly is disposed between the valve body and the valve cover. The diaphragm assembly includes a corrugated diaphragm sheet and a boss for pressing the corrugated diaphragm sheet. The lower end of the return spring abuts against the boss.

[0015] A hexagonal valve stem screw with a through hole is provided. The hexagonal valve stem screw is disposed in the valve body and is used to separate the high-pressure chamber and the low-pressure chamber.

[0016] The valve core is disposed in the valve body and passes through the through hole of the hexagonal valve stem screw.

[0017] In some embodiments, the valve core has a first end and a second end, the first end being placed in the low-pressure chamber and abutting against the corrugated diaphragm, the second end being placed in the high-pressure chamber, and the second end being fitted with a damping ring and a compression spring;

[0018] The valve core has a limiting post, which has a conical part and a cylindrical part. The conical part is used to abut against the through hole of the hexagonal valve stem screw. The compression spring abuts between the damping ring and the cylindrical part.

[0019] In some embodiments, the included angle formed by the vertical cross-section of the conical portion is 120° to 150°;

[0020] The through hole of the hexagonal valve stem screw has a chamfer that mates with the tapered portion.

[0021] In some embodiments, the boss is concentrically arranged with the corrugated diaphragm, and the projected area of ​​the lower end face of the boss is smaller than the area of ​​the corrugated diaphragm.

[0022] In some embodiments, the surface of the valve body has a first coating, and the surfaces of the diaphragm assembly and the valve core both have a second coating. The first coating and the second coating are silanized inert coatings, and the thickness of the second coating is less than the thickness of the first coating.

[0023] Through the above technical solution, the air inlet and outlet are connected to the external pipeline via threads. The external pipeline is designed with protrusions. During the tightening of the threads, these protrusions axially abut against the air inlet or outlet of the valve body, forming a metal-to-metal seal under the compression action. This design does not rely on PTFE tape or other auxiliary sealing materials, achieving a seal directly through mechanical compression. This avoids the fiber debris or residue that may be generated during the installation of PTFE tape, thereby improving the cleanliness of the system and reducing the risk of contamination to the gas or fluid system. The pressure gauge adopts a conical design, which, in conjunction with a conical ferrule, causes the conical ferrule to elastically deform under compression when the pressure gauge is inserted, tightly fitting the inner wall of the conical pressure gauge to form an effective seal. This self-sealing mechanism also eliminates the need for PTFE tape or gaskets, further ensuring the cleanliness of the sealing process, preventing foreign matter from entering the system, simplifying the installation and maintenance process, reducing the risk of leakage, minimizing contamination caused by the decomposition or residue of sealing materials, and improving the overall reliability and safety of the system.

[0024] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0026] Figure 1 This is a cross-sectional view of the connection between the external pipe and the air inlet in the pressure reducing valve connection structure of this utility model;

[0027] Figure 2 This is a cross-sectional view of the connection between the pressure measuring groove and the pressure gauge in the pressure reducing valve connection structure of this utility model;

[0028] Figure 3This is a cross-sectional view of the high-cleanliness diaphragm pressure reducing valve of this utility model;

[0029] Explanation of reference numerals in the attached figures

[0030] Detailed Implementation

[0031] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0033] like Figure 1 and Figure 2 As shown, the first aspect of this utility model provides a pressure reducing valve connection structure, including a valve body 100 and a conical ferrule 301. The valve body 100 has an air inlet 101, an air outlet 102, and a pressure measuring groove 103 for connecting with a pressure gauge 300. Both the air inlet 101 and the air outlet 102 are used to connect with an external pipe 200 via threaded engagement. The external pipe 200 has a protrusion 201, which axially abuts against the air inlet 101 and the air outlet 102 when the external pipe 200 is threadedly tightened to connect with them. The pressure gauge 201 is used to seal the air inlet 101 and outlet 102 under the compression of the external pipe 200. The pressure measuring groove 103 is conical, and the conical ferrule 301 is adapted to the shape of the pressure measuring groove 103. The conical ferrule 301 is used to form a sealed connection between the pressure gauge 300 and the pressure measuring groove 103 under the compression of the pressure gauge 300. When the pressure gauge 300 is screwed in, its compression causes the conical ferrule 301 to undergo radial expansion and fitting deformation, tightly filling all gaps between the conical pressure measuring groove 103 and the pressure gauge 300. This deformation is self-adaptive and can compensate for machining tolerances, minor surface unevenness, or slight wear, forming a leak-free seal.

[0034] The air inlet 101 and air outlet 102 are connected to the external pipe 200 via threads. The external pipe 200 has a protrusion 201. During thread tightening, this protrusion 201 axially abuts against the air inlet 101 or air outlet 102 of the valve body 100, forming a metal-to-metal seal under compression. This design eliminates the need for PTFE tape or other auxiliary sealing materials, achieving a seal directly through mechanical compression. This avoids fiber debris or residue that may be generated during PTFE tape installation, thereby improving system cleanliness and reducing contamination of the gas or flow. To mitigate the risk of contamination in the system, the pressure testing groove 103 employs a conical design, working in conjunction with a conical ferrule 301. When the pressure gauge 300 is inserted, the conical ferrule 301 undergoes elastic deformation under compression, tightly fitting the inner wall of the pressure testing groove 103 to form an effective seal. This self-sealing mechanism also eliminates the need for PTFE tape, further ensuring the cleanliness of the sealing process, preventing foreign matter from entering the system, simplifying the installation and maintenance process, reducing the risk of leakage, minimizing contamination caused by the decomposition or residue of sealing materials, and improving the overall system reliability and safety.

[0035] In some embodiments, the pressure gauge 300 has a first connecting portion 300a, and a tapered sleeve 301 is disposed at the end of the first connecting portion 300a and is used to extend into the pressure measuring groove 103. The pressure measuring groove 103 has a second connecting portion 103a, and the first connecting portion 300a is used for threaded connection with the second connecting portion 103a. The first connecting portion 300a has external threads, and the second connecting portion 103a extending from the pressure measuring groove 103 has internal threads. The first connecting portion 300a and the second connecting portion 103a are connected by threads, and when the threads are tightened between the first connecting portion 300a and the second connecting portion 103a, the pressure gauge 300 and the pressure measuring groove 103 simultaneously compress the tapered sleeve 301. The tapered sleeve 301 deforms due to compression and fits tightly against the inner wall of the pressure measuring groove 103, forming an effective seal. This connection structure can replace the traditional PTFE tape connection, further ensuring the cleanliness of the sealing process and preventing foreign objects from entering the pressure reducing valve.

[0036] In some embodiments, the valve body 100 includes a high-pressure chamber 104 and a low-pressure chamber 105. The pressure measuring groove 103 is divided into a first pressure measuring groove and a second pressure measuring groove. The high-pressure chamber 104 is connected to the air inlet 101 via the first pressure measuring groove, and the low-pressure chamber 105 is connected to the air outlet 102 via the second pressure measuring groove. The pressure gauge 300 is also divided into a first pressure gauge and a second pressure gauge. The high-pressure chamber 104 is connected to the first pressure gauge via the first pressure measuring groove. The first pressure gauge measures the gas pressure of the gas entering the high-pressure chamber 104 through the air inlet 101. The low-pressure chamber 105 is connected to the second pressure gauge via the second pressure measuring groove. The second pressure gauge measures the gas pressure of the gas flowing from the low-pressure chamber 105 to the air outlet 102. This separate layout of the high-pressure chamber 104 and the low-pressure chamber 105 provides a clear guiding path for the medium flow during the pressure reduction process from the air inlet 101 to the air outlet 102, significantly reducing the ineffective volume caused by traditional complex flow channels. The dual-chamber structure and independent pressure measurement path ensure that the pressure gauge 300 connected to the first pressure measurement chamber only reports the true inlet pressure, and the pressure gauge 300 connected to the second pressure measurement chamber only reports the true outlet pressure, which significantly improves the independence and accuracy of pressure monitoring data.

[0037] In some embodiments, the sealing surface between the external pipe 200 and the air inlet 101 and air outlet 102 is a first sealing surface, and the roughness Ra of the first sealing surface is ≤0.1μm. A roughness Ra≤0.1μm makes it less likely to trap particulate contaminants and reduces dead zones, while also preventing particles generated by mechanical friction from affecting the cleanliness of the valve body 100.

[0038] The second aspect of this utility model provides a high-cleanliness diaphragm pressure reducing valve, such as... Figure 3 As shown, the pressure reducing valve connection structure includes any of the above-mentioned features. The high-cleanliness diaphragm pressure reducing valve includes a valve cover 400, a diaphragm assembly 500, a hexagonal valve stem screw 600, and a valve core 700. The valve cover 400 is correspondingly connected to the valve body 100. An adjusting nut 401 is connected to the top of the valve cover 400. The adjusting nut 401 is threadedly connected to the valve cover 400. A return spring 402 is provided inside the valve cover 400. The upper end of the return spring 402 abuts against the adjusting nut 401, and the lower end abuts against the diaphragm assembly 500. The top wall of the adjusting nut 401 has a protrusion 401a. The protrusion 401a abuts against the return spring 402 through a washer 403, which facilitates the vertical displacement of the protrusion 401a by rotating the adjusting nut 401 to adjust the compression force of the return spring 402.

[0039] A diaphragm assembly 500 is disposed between the valve body 100 and the valve cover 400. The diaphragm assembly 500 includes a corrugated diaphragm sheet 500b and a boss 500a for pressing the corrugated diaphragm sheet 500b. In some embodiments, the boss 500a and the corrugated diaphragm sheet 500b are concentrically arranged, and the projected area of ​​the lower end face of the boss 500a is smaller than the area of ​​the corrugated diaphragm sheet 500b. The concentric structure with the gradient matching of the areas of the boss 500a and the corrugated diaphragm sheet 500b ensures that the boss 500a can only press the middle part of the corrugated diaphragm sheet 500b, and the outer ring of the corrugated diaphragm sheet 500b is not pressed. This can reduce the vibration of the corrugated diaphragm sheet 500b, better achieve pressure stabilization, and at the same time improve the pressure sensing sensitivity and optimize the sealing reliability, synergistically enhance the diaphragm fatigue resistance and system pressure reduction efficiency. The diaphragm assembly 500 also includes a diaphragm limiting ring and a sealing ring. The sealing ring achieves a seal between the diaphragm assembly 500 and the valve body 100, and the diaphragm limiting ring can limit the corrugated diaphragm 500b to prevent it from slightly displacing during use and affecting the energy efficiency of the pressure reducing valve.

[0040] The hexagonal valve stem screw 600 has a through hole and is located inside the valve body 100 to separate the high-pressure chamber 104 and the low-pressure chamber 105. Specifically, the chamber located below the diaphragm at the upper end of the hexagonal valve stem screw 600 is the low-pressure chamber 105, and the chamber located at the lower end of the hexagonal valve stem screw 600 is the high-pressure chamber 104. The screw body acts as a rigid barrier to physically separate the high-pressure chamber 104 and the low-pressure chamber 105, blocking the crossflow of media and ensuring the stability of the pressure gradient.

[0041] The valve core 700 is disposed within the valve body 100 and passes through the through hole of the hexagonal valve stem screw 600, and can move up and down within the through hole. In some embodiments, the valve core 700 has a first end 701 and a second end 702. The first end 701 is placed in the low-pressure chamber 105 and abuts against the corrugated diaphragm 500b. The second end 702 is placed in the high-pressure chamber 104, and a damping ring 704 and a compression spring 705 are sleeved on the second end 702. The valve core 700 has a limiting post 703. Valve core 703 has a tapered portion 703a and a cylindrical portion 703b. The tapered portion 703a abuts against the through hole of the hexagonal valve stem screw 600. During the lifting and lowering of valve core 700, it can block or open the through hole to open or close the passage between the high-pressure chamber 104 and the low-pressure chamber 105. A compression spring 705 abuts against the damping ring 704 and the cylindrical portion 703b. During fluctuations in operating conditions or valve operation, the compression spring 705 helps valve core 700 to quickly return to the closed position. A limit ring is also fitted onto the second end 702 of valve core 700. The limit ring can radially limit valve core 700 to prevent the second end 702 of valve core 700 from deflecting due to high-pressure medium.

[0042] The second end 702 of the valve core 700 is located inside the high-pressure chamber 104 and is fitted with a damping ring 704. It is pre-tightened to the columnar portion 703b of the limiting post 703 by a compression spring 705. The conical portion 703a of the limiting post 703 engages with the through hole of the hexagonal valve stem screw 600. When the conical portion 703a abuts against the through hole, the channel between the high-pressure chamber 104 and the low-pressure chamber 105 is closed. When the valve core 700 descends, the channel between the low-pressure chamber 105 and the high-pressure chamber 104 opens. By changing the opening between the valve core 700 and the through hole, the flow rate of the medium flowing from the high-pressure inlet to the low-pressure outlet can be precisely controlled, which not only improves the sealing accuracy but also achieves flow control. The first end 701 of the valve core 700 abuts against the corrugated diaphragm 500b, so that the diaphragm driving force acts directly on the axis of the valve core 700. The preload of the compression spring 705 constantly pushes the tapered portion 703a of the limit post 703 to press against the screw through hole, eliminating the axial clearance of the valve core 700 and preventing the valve core 700 from experiencing lag in return or seal disengagement under low-pressure conditions, thus ensuring rapid response to outlet pressure and reliable low-pressure sealing. The vibration damping ring 704 blocks the direct impact of the high-pressure medium on the valve core 700.

[0043] In some embodiments, the included angle formed by the vertical cross-section of the tapered portion 703a is 120°~150°; the through hole of the hexagonal valve stem screw 600 has a chamfer that mates with the tapered portion 703a, specifically set to 135°, which can achieve a good fit with the chamfer and at the same time suppress the lateral oscillation of the valve core 700 in turbulent media, maintaining throttling stability. The tapered-chamfer fit structure at a specific angle, while maintaining sealing reliability, significantly improves the vibration resistance, structural strength, and manufacturing feasibility of the valve core 700, providing key support for high-precision pressure control of the pressure reducing valve.

[0044] During use, the adjusting nut 401 linearly changes the preload of the return spring 402 by the depth of screwing in. The force of the return spring 402 is transmitted to the corrugated diaphragm 500b via the boss 500a, forming the setting reference for the outlet pressure. The diaphragm senses the pressure gauge of the low-pressure chamber 105 in real time and provides deformation feedback, driving the valve core 700 to move axially to adjust the size of the flow channel in the through hole. When the adjusting nut 401 is screwed down, it compresses the return spring 402. The return spring 402 transmits its force to the corrugated diaphragm 500b via the boss 500a, and then the corrugated diaphragm 500 causes the valve core 700 to descend. At this time, the conical part 703a on the valve core 700 disengages from the through hole of the hexagonal valve stem screw 600, the channel between the high-pressure chamber 104 and the low-pressure chamber 105 opens, and the medium in the valve body 100 can flow from the inlet 101 to the outlet 102.

[0045] In some embodiments, the surface of the valve body 100 has a first coating, and the surfaces of the diaphragm assembly 500 and the valve core 700 both have a second coating. Both the first and second coatings are silanized inert coatings. The thickness of the second coating is less than the thickness of the first coating. Specifically, the thickness of the first coating is in the range of 200-500 nm, and the thickness of the second coating is in the range of 100-300 nm. The silanized inert coating forms a dense chemically bonded layer on the metal surface of the valve body 100, effectively blocking the corrosion of the valve body 100 by moisture, acidic / alkaline gases, or industrial media, avoiding damage to the sealing surface, reduction in structural strength, or particulate matter shedding caused by corrosion, extending the service life of the valve body 100 under harsh operating conditions. At the same time, it can prevent the valve body 100 from releasing chemical substances that affect the cleanliness of the pressure reducing valve. The smooth sealing surface (Ra≤0.1μm) works synergistically with the inert coating to reduce the risk of adhesive wear of metal micro-protrusions during the extrusion sealing process, ensuring that the first sealing surface maintains high sealing integrity during long-term use and reducing the leakage rate. Diaphragm assembly 500 and valve core 700 are prone to fretting wear during frequent deformation / slippage. Thin-layer silanization treatment forms a chemically bonded, dense film on the substrate, significantly reducing surface free energy, suppressing wear debris generation and intermetallic adhesion effects, and extending the service life of high-dynamic components. Compared to the thinner design of the first coating, the second coating maintains the low coefficient of friction of the silanized inert surface while avoiding excessively thick coatings that could increase resistance or cause sliding adhesion between valve core 700 and the through-hole of hexagonal valve stem screw 600. This ensures efficient pressure sensing deformation transmission and sensitive axial fine-tuning of valve core 700, improving dynamic response accuracy.

[0046] This invention provides a pressure reducing valve connection structure in which the valve body 100's inlet 101 and outlet 102 are connected to an external pipe 200 via threads. The external pipe 200 has a protrusion 201 that, during thread tightening, axially abuts against the valve body 100's inlet 101 or outlet 102, forming a metal-to-metal seal under compression. This design eliminates the need for PTFE tape or other auxiliary sealing materials, achieving a seal directly through mechanical compression. This avoids the fiber debris or residue that may be generated during PTFE tape installation, thereby improving system performance. The high cleanliness of the pressure gauge 103 reduces the risk of contamination to gas or fluid systems. The pressure gauge 103 adopts a conical design and works with a conical ferrule 301. When the pressure gauge 300 is inserted, the conical ferrule 301 undergoes elastic deformation under compression, tightly fitting the inner wall of the pressure gauge 103 to form an effective seal. This self-sealing mechanism also eliminates the need for PTFE tape, further ensuring the cleanliness of the sealing process, preventing foreign matter from entering the system, simplifying the installation and maintenance process, reducing the risk of leakage, minimizing contamination caused by the decomposition or residue of sealing materials, and improving the overall reliability and safety of the system.

[0047] The present invention provides a high-cleanliness diaphragm pressure reducing valve, including a pressure reducing valve connection structure, which significantly reduces the dead volume at the connection, improves the cleanliness level of the pressure reducing valve, effectively prevents the introduction of chemical contaminants from particles, microorganisms, rubber or plastics, ensures the ultra-high purity of downstream process fluids, and has the advantages of simple structure, easy maintenance and long service life.

[0048] In the description of this utility model, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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 present 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pressure reducing valve connection structure characterized by comprising: The pressure reducing valve connection structure includes: The valve body (100) has an air inlet (101), an air outlet (102), and a pressure measuring groove (103) for connecting to a pressure gauge (300). The air inlet (101) and the air outlet (102) are both used to connect with an external pipe (200) by threaded engagement. The external pipe (200) has a protrusion (201) for axially abutting against the air inlet (101) and the air outlet (102) when the external pipe (200) and the air inlet (101) and the air outlet (102) are threadedly tightened together. The protrusion (201) is used to seal the air inlet (101) and the air outlet (102) under the compression of the external pipe (200). A conical ferrule (301) is provided, wherein the pressure measuring groove (103) is conical, and the conical ferrule (301) and the pressure measuring groove (103) are adapted to each other. The conical ferrule (301) is used to form a sealed connection between the pressure gauge (300) and the pressure measuring groove (103) under the squeezing action of the pressure gauge (300) and the pressure measuring groove (103).

2. The pressure reducing valve connection structure according to claim 1, characterized by The pressure gauge (300) has a first connecting part (300a), and the conical sleeve (301) is disposed at the end of the first connecting part (300a) and is used to extend into the pressure measuring groove (103). The pressure measuring groove (103) has a second connecting part (103a), and the first connecting part (300a) is used to be threadedly connected to the second connecting part (103a).

3. The pressure reducing valve connection structure according to claim 1, characterized by The valve body (100) is provided with a high-pressure chamber (104) and a low-pressure chamber (105). The pressure measuring groove (103) is divided into a first pressure measuring groove and a second pressure measuring groove. The high-pressure chamber (104) is connected to the air inlet (101) through the first pressure measuring groove, and the low-pressure chamber (105) is connected to the air outlet (102) through the second pressure measuring groove.

4. The pressure reducing valve connection structure according to claim 1, characterized by The sealing surface between the external pipe (200) and the air inlet (101) and the air outlet (102) is the first sealing surface, and the roughness Ra of the first sealing surface is ≤0.1μm.

5. A high clean diaphragm pressure reducing valve characterized by, The pressure reducing valve connection structure includes any one of claims 1 to 4.

6. The high clean diaphragm pressure reducing valve according to claim 5, wherein The high-cleanliness diaphragm pressure reducing valve includes: A valve cover (400) is connected to the valve body (100). An adjusting nut (401) is connected to the top of the valve cover (400). A return spring (402) is provided inside the valve cover (400). The upper end of the return spring (402) abuts against the adjusting nut (401). A diaphragm assembly (500) is disposed between the valve body (100) and the valve cover (400). The diaphragm assembly (500) includes a corrugated diaphragm sheet (500b) and a boss (500a) for pressing the corrugated diaphragm sheet (500b). The lower end of the return spring (402) abuts against the boss (500a). The hexagonal valve stem screw (600) has a through hole and is disposed inside the valve body (100) to separate the high pressure chamber (104) and the low pressure chamber (105); The valve core (700) is disposed inside the valve body (100) and passes through the through hole of the hexagonal valve stem screw (600).

7. The high clean diaphragm pressure reducing valve according to claim 6, wherein The valve core (700) has a first end (701) and a second end (702). The first end (701) is placed in the low-pressure chamber (105) and abuts against the corrugated diaphragm (500b). The second end (702) is placed in the high-pressure chamber (104). The second end (702) is fitted with a damping ring (704) and a compression spring (705). The valve core (700) has a limiting post (703), the limiting post (703) has a conical part (703a) and a columnar part (703b), the conical part (703a) is used to abut against the through hole of the hexagonal valve stem screw (600); the compression spring (705) abuts between the damping ring (704) and the columnar part (703b).

8. The high clean diaphragm pressure reducing valve according to claim 7, wherein The included angle formed by the vertical cross-section of the conical portion (703a) is 120°~150°; The through hole of the hexagonal valve stem screw (600) has a chamfer that mates with the tapered portion (703a).

9. The high clean diaphragm pressure reducing valve of claim 6, wherein, The boss (500a) and the corrugated diaphragm (500b) are concentrically arranged, and the projected area of ​​the lower end face of the boss (500a) is smaller than the area of ​​the corrugated diaphragm (500b).

10. The high-cleanse diaphragm pressure reducing valve according to any one of claims 6 to 9, characterized by The surface of the valve body (100) has a first coating, and the surfaces of the diaphragm assembly (500) and the valve core (700) both have a second coating. The first coating and the second coating are silanized inert coatings, and the thickness of the second coating is less than the thickness of the first coating.

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