Pressure reducing valve

Abstract

The utility model provides a pressure reducing valve relates to valve technical field, the utility model provides a pressure reducing valve, because the guide bushing is installed into the valve body in the way of clearance fit, and is bent and is pressed into the gap groove through the hole wall part of the mounting hole, to realize the fixed guide bushing, instead of the riveting interference fit connection mode of traditional, effectively avoid the interference fit and lead to the guide bushing outside diameter place produce the chaff, particle etc, do not affect product cleanliness, the guide bushing inner diameter will not change, change amount is easier to control, alleviate the existing technology in the installation between guide bushing and valve body with interference fit, the guide bushing outer surface and valve body have impurities, affect product cleanliness, and the guide bushing inner diameter cannot control's technical problem, and, diaphragm uses PTFE material, need not daub the lubricating grease, make product will not contaminate the use medium.

Description

Technical Field

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

[0002] Engineering plastic guide sleeves, as key components in valve assemblies, are widely used in various fluid control systems. In existing technologies, engineering plastic guide sleeves are typically pressed into the metal valve body using an interference fit to achieve stable fixation and precise guidance. This assembly process mainly includes the following technical characteristics: the outer diameter of the guide sleeve is designed to be slightly larger than the inner diameter of the valve body mounting hole; axial pressure is applied using a press-fitting device to cause elastic deformation of the guide sleeve, achieving an interference fit with the valve body.

[0003] In traditional assembly processes, when the guide sleeve is pressed into the metal valve body with an interference fit, the difference in hardness between the engineering plastic and metal materials causes plastic lint and tiny particles to easily form on the outer surface of the guide sleeve when it rubs violently against the inner wall of the valve body. These contaminants adhere to the mating surfaces and, due to the confined space and complex structure inside the valve body, are difficult to remove completely using conventional cleaning methods. When the valve is put into actual use, the particles remaining at the assembly interface may enter critical areas inside the valve body with the flow of the medium, causing the product's cleanliness indicators to exceed the allowable range.

[0004] Furthermore, engineering plastic materials exhibit significant plastic deformation characteristics when subjected to interference fit forces, causing the final inner diameter of the guide sleeve to deviate from the design value, thus affecting the accuracy of the fit clearance with the valve core. In actual operating conditions, excessive fit clearance can lead to media leakage, while insufficient clearance may cause the valve core to jam, severely impacting the valve's control accuracy and reliability. Utility Model Content

[0005] The purpose of this utility model is to provide a pressure reducing valve to alleviate the technical problems existing in the prior art, such as the use of interference fit to complete the installation between the guide sleeve and the valve body, which results in impurities between the outer surface of the guide sleeve and the valve body, affecting the cleanliness of the product, and the inability to control the inner diameter of the guide sleeve.

[0006] The pressure reducing valve provided by this utility model includes: a valve body and a guide sleeve; The valve body has a mounting hole, the guide sleeve is disposed in the mounting hole, and the guide sleeve is connected to the valve body with a clearance fit. The end sidewall of the guide sleeve is recessed inward to form a notch, and the portion of the mounting hole wall corresponding to the notch is configured to bend and extend into the notch, so that the mounting hole wall can press down to restrict the guide sleeve.

[0007] In an optional implementation, The pressure reducing valve also includes a main pressure regulating diaphragm and a main pressure regulating diaphragm pad; The main pressure regulating diaphragm is disposed on the top of the valve body, and the main pressure regulating diaphragm pad is disposed on the top surface of the main pressure regulating diaphragm; The main pressure regulating diaphragm is made of plastic, and the main pressure regulating diaphragm pad is made of rubber. The pressure reducing valve also includes a lower diaphragm and a lower diaphragm pad; The lower diaphragm is disposed at the bottom of the valve body, and the lower diaphragm pad is disposed on the bottom surface of the lower diaphragm; The lower diaphragm is made of plastic material, and the lower diaphragm pad is made of rubber material.

[0008] In an optional implementation, Both the main pressure regulating diaphragm and the lower diaphragm have streamlined arc surfaces.

[0009] In an optional implementation, The pressure reducing valve also includes a valve cap, a lower pressure regulating column, and a valve cap sleeve; The top of the valve cap is connected to the bottom of the valve body via a retaining ring; The valve cap is provided with a valve cap hole, the lower pressure regulating column passes through the valve cap hole, and the top end of the lower pressure regulating column is connected to the lower diaphragm pad; The valve cap sleeve is disposed at the bottom end of the valve cap, and the valve cap sleeve is configured to block the valve cap hole.

[0010] In an optional implementation, The pressure reducing valve also includes a valve core, a force-bearing component, and a force-bearing cap; The valve core passes through the guide sleeve, and the top end of the valve core is connected to the force-bearing component, while the bottom end of the valve core is connected to the lower diaphragm. The force-bearing component passes through the main pressure regulating diaphragm, the main pressure regulating diaphragm pad, and the force-bearing cap, and the end of the force-bearing component near the valve core extends to form a force-bearing boss, which is connected to the main pressure regulating diaphragm. The pressure cap is connected to the main pressure adjusting diaphragm pad, and the pressure cap is used to connect to the spring located above it. The top of the spring is connected to the main pressure adjusting shaft.

[0011] In an optional implementation, The valve core is in contact with the force-bearing component.

[0012] In an optional implementation, The valve core and the force-bearing component are integral structures, and the valve core and the force-bearing component are provided with an overflow channel inside. The overflow channel is used to allow the medium between the main pressure regulating diaphragm and the lower diaphragm to overflow into the main pressure regulating seat.

[0013] In an optional implementation, The bottom end of the main pressure regulating seat is connected to the main pressure regulating diaphragm pad. The main pressure regulating seat is provided with a threaded hole for connecting to an external pipeline so that the medium entering the main pressure regulating seat from the overflow channel flows out through the threaded hole.

[0014] In an optional implementation, The valve body has an inlet channel and an outlet channel; Both the inlet channel and the outlet channel are provided with internal threads for connection to external pipelines.

[0015] In an optional implementation, The valve body has an inlet channel and an outlet channel; Both the inlet channel and the outlet channel are connected to connector components for connection with external pipelines. The connector component is configured as a compression fitting or a metal-faced sealing fitting.

[0016] The pressure reducing valve provided by this utility model uses a guide sleeve installed into the valve body with a clearance fit. The guide sleeve is then pressed into the notch groove by bending the wall of the mounting hole to fix it. This replaces the traditional riveting interference fit connection method, effectively avoiding the generation of lint and particles at the outer diameter of the guide sleeve due to the interference fit. This does not affect the cleanliness of the product, and the inner diameter of the guide sleeve does not change, making it easier to control the amount of change. This alleviates the technical problems in the prior art where the installation between the guide sleeve and the valve body is completed with an interference fit, resulting in impurities between the outer surface of the guide sleeve and the valve body, affecting the cleanliness of the product, and the inner diameter of the guide sleeve cannot be controlled. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the pressure reducing valve provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of another embodiment of the pressure reducing valve provided in this utility model. Figure 3 This is a schematic diagram of the structure of the valve body and guide sleeve in the pressure reducing valve provided in an embodiment of the present utility model; Figure 4 This is an enlarged schematic diagram of the pressure reducing valve before the valve body and guide sleeve are riveted together, provided in an embodiment of the present utility model. Figure 5This is an enlarged schematic diagram of the pressure reducing valve after the valve body and guide sleeve are riveted together, provided in an embodiment of the present utility model. Figure 6 A schematic diagram of the structure of the pressure reducing valve with connector components provided in this embodiment of the utility model; Figure 7 This is a schematic diagram of another embodiment of the pressure reducing valve with a connector component provided in this utility model. Figure 8 This is a schematic diagram showing the connection between the connector component and the external connector in the pressure reducing valve provided in this embodiment of the utility model; Figure 9 This is a schematic diagram of another embodiment of the connector component in the pressure reducing valve provided in this utility model.

[0019] Icons: 1-Valve body; 2-Guide sleeve; 3-Notch; 4-Main pressure regulating diaphragm; 5-Main pressure regulating diaphragm pad; 6-Lower diaphragm; 7-Lower diaphragm pad; 8-Valve cap; 9-Lower pressure regulating column; 10-Valve cap sleeve; 11-Valve core; 12-Force-bearing component; 13-Force-bearing pressure cap; 14-Overflow channel; 15-Main pressure regulating seat; 16-Threaded hole; 17-Connector component; 18-Spring; 19-Valve cap hole; 20-Main pressure regulating shaft; 21-Retaining ring; 22-Rivet head; 23-External connector. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] 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.

[0024] like Figures 1-5 As shown, the pressure reducing valve provided in this embodiment includes: a valve body 1 and a guide sleeve 2; the valve body 1 has an internal mounting hole, and the guide sleeve 2 is assembled into the mounting hole, and a clearance fit is used to achieve initial positioning and installation. An inwardly recessed notch 3 is provided on the end side wall of the guide sleeve 2, and the valve body 1 is made entirely of metal. The mounting hole wall on the valve body 1 has plastic deformation capability at the corresponding position, allowing it to bend under the external force of the rivet head 22 during assembly and extend into the notch 3 of the guide sleeve 2, thereby forming a locking structure. This effectively restricts the axial movement of the guide sleeve 2, preventing it from loosening or falling off during use, while avoiding problems such as stress concentration and uneven material deformation caused by traditional interference fits.

[0025] Because of the use of clearance fit and localized compression fixing, the guide sleeve 2 will not generate metal fragments or burrs due to strong friction during installation, significantly improving the cleanliness level of the product's interior. This is especially suitable for applications with high requirements for media purity, such as semiconductor manufacturing and medical gas delivery systems. Furthermore, this structure ensures high dimensional stability of the guide sleeve 2's inner diameter, with no change in the inner diameter before and after assembly. This facilitates smooth movement of the valve core 11 and consistent control of sealing performance, resolving defects in existing technologies such as motion stagnation and slow response caused by the shrinkage or distortion of the guide sleeve 2's inner diameter due to interference fit.

[0026] This embodiment also includes a main pressure regulating diaphragm 4 and a main pressure regulating diaphragm pad 5. The main pressure regulating diaphragm 4 is located on the top of the valve body 1 and serves as a key pressure sensing element. Its top surface is attached to and connected to the main pressure regulating diaphragm pad 5. The main pressure regulating diaphragm 4 is preferably made of polytetrafluoroethylene (PTFE), which has excellent chemical stability, temperature resistance, and self-lubricating properties. The main pressure regulating diaphragm pad 5 is made of a rubber-like elastic material, which can provide a good sealing interface. When the two are combined, reliable sealing between the edge and center areas is achieved by relying on the elastic deformation of the PTFE material itself. The sealing integrity can be guaranteed under long-term operation without the need for additional grease application, which simplifies the assembly process and avoids the risk of grease contamination.

[0027] Similarly, the pressure reducing valve also features a lower diaphragm 6 and a lower diaphragm pad 7 at its bottom. The lower diaphragm 6, also made of PTFE, is installed at the bottom of the valve body 1, and its bottom surface is fitted with a rubber lower diaphragm pad 7 to create a dynamic seal on the downstream side. Like the main pressure regulating diaphragm 4, the lower diaphragm 6 utilizes the controllable elastic deformation of PTFE resin under pressure to complete the seal within its own structure, eliminating the need for any lubricating medium and meeting the requirements of high-cleanliness operating conditions.

[0028] In an optional embodiment, both the main pressure regulating diaphragm 4 and the lower diaphragm 6 have streamlined arc surfaces, and the streamlined design makes it less likely to generate lint due to friction with the fluid.

[0029] In an optional embodiment, the pressure reducing valve further includes a valve cap 8, a lower pressure regulating column 9, and a valve cap sleeve 10; the valve cap 8 is fixed to the bottom of the valve body 1 by a retaining ring 21, forming a stable support frame. A valve cap hole 19 is provided in the center of the valve cap 8, and the lower pressure regulating column 9 passes through the valve cap hole 19. The top end of the lower pressure regulating column 9 is connected to the lower diaphragm pad 7 to transmit the pressure sensed by the lower diaphragm 6.

[0030] The valve cap sleeve 10 is installed at the bottom end of the valve cap 8, which can completely block the outlet of the valve cap hole 19, play an isolation role, and prevent residual gas or trace impurities that may be generated inside the valve cavity from being directly discharged into the external environment, thus ensuring the safety and cleanliness of the operating space.

[0031] In an optional embodiment, the pressure reducing valve further includes a valve core 11, a force-bearing component 12, and a force-bearing cap 13. The valve core 11 passes through the inside of the guide sleeve 2 to achieve guided movement. The upper end of the valve core 11 is connected to the force-bearing component 12, and the lower end is connected to the lower diaphragm 6. The force-bearing component 12 extends further upward and passes through the main pressure regulating diaphragm 4, the main pressure regulating diaphragm pad 5, and the force-bearing cap 13, forming a rod-like structure. On the side near the valve core 11, the force-bearing component 12 is provided with a force-bearing boss, which is in close contact with the main pressure regulating diaphragm 4, converting the pressure borne by the diaphragm into a downward force. The force-bearing cap 13 is located at the top and is connected to the main pressure regulating diaphragm pad 5. It also serves as a support point for the spring 18, connecting the external main pressure regulating spring 18. The other end of the spring 18 is connected to the main pressure regulating shaft 20. By adjusting the position of the main pressure regulating shaft 20, the preload can be set, thereby controlling the outlet pressure value.

[0032] In one optional embodiment, the valve core 11 and the force-bearing component 12 are connected by an abutment, facilitating disassembly and maintenance and adapting to replacement needs under different operating conditions. In another optional embodiment, the valve core 11 and the force-bearing component 12 are machined into an integral structure, which not only improves the overall rigidity and response accuracy but also provides an overflow channel 14 inside. This overflow channel 14 passes through the valve core 11 and the force-bearing component 12, allowing the cavity medium between the main pressure regulating diaphragm 4 and the lower diaphragm 6 to flow into the main pressure regulating seat 15 through this path. The main pressure regulating seat 15 is provided with a threaded hole 16 for connecting to an external pipeline, so that the medium entering the main pressure regulating seat 15 from the overflow channel 14 flows out through the threaded hole 16, which is used to collect any potentially overflowing medium or discharge it outside the current operating environment.

[0033] In an optional embodiment, valve body 1 has an inlet channel and an outlet channel. The inlet channel is located at point P in the figure, and the outlet channel is located at point A in the figure. The connection method between the inlet channel or the outlet channel and the external pipeline can be various, for example... Figure 1 As shown, the inlet and outlet channels have internal thread structures, and the external thread on the external pipeline mates with the internal thread to achieve connection. Alternatively, both the inlet and outlet channels are connected to a connector 17 for connection to the external pipeline. The connector 17 can take various forms, such as... Figure 6 As shown, the connector component 17 is connected to the external connector 23, which is connected to the external pipeline in the form of a compression fitting, or as... Figure 7 As shown, the connector component 17 is connected to the external connector 23 in the form of a metal-faced sealing connector. A boss is provided on the metal-faced sealing connector, which engages with a protrusion on the external connector 23. An internal thread is provided within the external connector 23 for connection to external pipelines, or as shown... Figure 8As shown, an external connector 23 is fitted onto the connector component 17. The external connector 23 has external threads, allowing it to be rotatably connected to an external pipeline, or as... Figure 9 As shown, the connector component 17 is connected to the external pipeline in a non-rotatable form with an external thread.

[0034] In summary, the pressure reducing valve provided in this embodiment replaces the traditional interference fit method with a clearance fit between the guide sleeve 2 and the valve body 1, fundamentally improving the cleanliness issue during assembly and enhancing the controllability of the key dimensions of the guide sleeve 2. Combined with a high-performance, grease-free diaphragm and streamlined flow channel design, this pressure reducing valve possesses high reliability, long lifespan, easy maintenance, and wide applicability, making it particularly suitable for widespread application in high-end industrial control systems.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pressure reducing valve, characterized in that, include: Valve body (1) and guide sleeve (2); The valve body (1) has a mounting hole, the guide sleeve (2) is disposed in the mounting hole, and the guide sleeve (2) is connected to the valve body (1) with clearance fit; The end sidewall of the guide sleeve (2) is recessed inward to form a notch (3), and the portion of the mounting hole wall corresponding to the notch (3) is configured to bend and extend into the notch (3) so that the mounting hole wall can press down to restrict the guide sleeve (2).

2. The pressure reducing valve according to claim 1, characterized in that, The pressure reducing valve also includes a main pressure regulating diaphragm (4) and a main pressure regulating diaphragm pad (5). The main pressure regulating diaphragm (4) is disposed on the top of the valve body (1), and the main pressure regulating diaphragm pad (5) is disposed on the top surface of the main pressure regulating diaphragm (4). The main pressure regulating diaphragm (4) is made of plastic material, and the main pressure regulating diaphragm pad (5) is made of rubber material; The pressure reducing valve also includes a lower diaphragm (6) and a lower diaphragm pad (7). The lower diaphragm (6) is disposed at the bottom of the valve body (1), and the lower diaphragm pad (7) is disposed on the bottom surface of the lower diaphragm (6). The lower diaphragm (6) is made of plastic material, and the lower diaphragm pad (7) is made of rubber material.

3. The pressure reducing valve according to claim 2, characterized in that, Both the main pressure regulating diaphragm (4) and the lower diaphragm (6) have streamlined arc surfaces.

4. The pressure reducing valve according to claim 2, characterized in that, The pressure reducing valve also includes a valve cap (8), a pressure regulating column (9), and a valve cap sleeve (10). The top of the valve cap (8) is connected to the bottom of the valve body (1) via a retaining ring (21); The valve cap (8) is provided with a valve cap hole (19), the lower pressure regulating column (9) passes through the valve cap hole (19), and the top end of the lower pressure regulating column (9) is connected to the lower membrane pad (7). The valve cap sleeve (10) is disposed at the bottom end of the valve cap (8), and the valve cap sleeve (10) is configured to block the valve cap hole (19).

5. The pressure reducing valve according to claim 2, characterized in that, The pressure reducing valve also includes a valve core (11), a force-bearing component (12), and a force-bearing cap (13). The valve core (11) passes through the guide sleeve (2), and the top end of the valve core (11) is connected to the force-bearing member (12), and the bottom end of the valve core (11) is connected to the lower diaphragm (6). The force-bearing component (12) passes through the main pressure regulating diaphragm (4), the main pressure regulating diaphragm pad (5) and the force-bearing cap (13), and the force-bearing component (12) extends to form a force-bearing boss at one end near the valve core (11), and the force-bearing boss is connected to the main pressure regulating diaphragm (4). The pressure cap (13) is connected to the main pressure adjusting film pad (5). The pressure cap (13) is used to connect to the spring (18) located above. The top of the spring (18) is connected to the main pressure adjusting shaft (20).

6. The pressure reducing valve according to claim 5, characterized in that, The valve core (11) is in contact with the force-bearing component (12).

7. The pressure reducing valve according to claim 5, characterized in that, The valve core (11) and the force-bearing component (12) are an integral structure, and the valve core (11) and the force-bearing component (12) are provided with an overflow channel (14). The overflow channel (14) is used to allow the medium between the main pressure regulating diaphragm (4) and the lower diaphragm (6) to overflow into the main pressure regulating seat (15).

8. The pressure reducing valve according to claim 7, characterized in that, The bottom end of the main pressure regulating seat (15) is connected to the main pressure regulating diaphragm (5). The main pressure regulating seat (15) is provided with a threaded hole (16). The threaded hole (16) is used to connect with an external pipeline so that the medium entering the main pressure regulating seat (15) from the overflow channel (14) flows out from the threaded hole (16).

9. The pressure reducing valve according to claim 1, characterized in that, The valve body (1) has an inlet channel and an outlet channel; Both the inlet channel and the outlet channel are provided with internal threads for connection to external pipelines.

10. The pressure reducing valve according to claim 1, characterized in that, The valve body (1) has an inlet channel and an outlet channel; Both the inlet channel and the outlet channel are connected to a connector component (17) for connection with external pipelines. The connector component is configured as a compression fitting or a metal-faced sealing fitting.

Images