Servicing valve

Abstract

The application relates to the technical field of valves and discloses a maintenance valve, which comprises a maintenance valve body and a pressure regulating assembly; the maintenance valve body comprises a first valve body and a first valve core; the first valve body is provided with a first sub-cavity and a second sub-cavity; the first valve core is movably arranged in the first valve body to connect or disconnect the first sub-cavity and the second sub-cavity; the pressure regulating assembly is arranged outside the first valve body; the pressure regulating assembly comprises a bypass pipe and a flow-regulating pressure-regulating valve; the bypass pipe is provided with a bypass flow channel; the two ends of the bypass flow channel are communicated with the first sub-cavity and the second sub-cavity respectively; and the flow-regulating pressure-regulating valve is arranged in the bypass pipe, so that the medium flow in the bypass pipe is adjustable. The maintenance valve disclosed by the application can reduce the occurrence of water hammer or severe pressure fluctuation when the valve is opened.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more particularly to a maintenance valve. Background Technology

[0002] Valves, as key components in pipeline systems, are primarily used to control fluid flow. In various fields such as industry, urban water supply, and energy, valves play a crucial role in switching, regulating, and distributing fluids. Large-diameter gate valves, butterfly valves, and ball valves, which are on / off type maintenance valves, can be difficult to open, require high opening torque, experience excessive impact flow, or have poor flow control when there is a large pressure difference before and after opening.

[0003] Therefore, how to reduce water hammer impact after the maintenance valve is opened is a technical problem that urgently needs to be solved. Utility Model Content

[0004] This application provides a maintenance valve that reduces the occurrence of water hammer or severe pressure fluctuations when opening the valve.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application provide a maintenance valve, including a maintenance valve body and a pressure regulating assembly; the maintenance valve body includes a first valve body and a first valve core, the first valve body having a first sub-cavity and a second sub-cavity; the first valve core is movably disposed within the first valve body to connect or disconnect the first sub-cavity and the second sub-cavity; the pressure regulating assembly is disposed outside the first valve body, the pressure regulating assembly including a bypass pipe and a flow regulating valve, the bypass pipe having a bypass flow channel, the two ends of the bypass flow channel being connected to the first sub-cavity and the second sub-cavity respectively; wherein the flow regulating valve is disposed within the bypass pipe to make the flow rate of the medium within the bypass pipe adjustable.

[0007] The maintenance valve proposed in this application embodiment has a flow regulating and pressure regulating valve installed in the bypass pipe so that the flow rate of the medium in the bypass pipe is adjustable. Before opening the first valve body, the flow regulating and pressure regulating valve can be used to adjust the flow rate of the medium in the bypass pipe, so that the fluid medium flows through the bypass channel between the first sub-cavity and the second sub-cavity, further reducing the pressure difference between the upstream and downstream passages. This can reduce the pressure fluctuation amplitude after the upstream and downstream pipelines are connected, reduce the water hammer when opening the valve, and make the process of filling or replenishing the empty pipe of the downstream pipe section become more stable from violent.

[0008] Optionally, the bypass pipe includes a first bypass pipe and a second bypass pipe, and the bypass channel includes a first bypass channel and a second bypass channel. The first bypass channel is disposed in the first bypass pipe and communicates with the first sub-cavity, and the second bypass channel is disposed in the second bypass pipe and communicates with the second sub-cavity. A flow regulating and pressure regulating valve is disposed between the first bypass pipe and the second bypass pipe so that the first bypass channel and the second bypass channel can be selectively connected.

[0009] In the above scheme, the first bypass channel connects to the first sub-cavity, and the second bypass channel connects to the second sub-cavity. Through the selective connection of the flow regulating valve, the flow control of the fluid medium between the first and second sub-cavities can be achieved. If the first valve body suddenly opens completely when the valve is opened, the medium velocity in the pipeline increases sharply, which can easily generate pressure shock waves (water hammer) due to inertia. By pre-adjusting the bypass flow rate through the flow regulating valve, the medium can first flow slowly into the downstream of the main valve through the bypass pipe, gradually balancing the pressure difference on both sides of the main valve. The main valve is then fully opened only after the upstream and downstream pressures are close, avoiding water hammer caused by sudden changes in flow velocity.

[0010] Optionally, the flow regulating and pressure regulating valve includes a second valve body and a second valve core located within the second valve body. At least a portion of the inner surface of the second valve body and the outer surface of the second valve core are spaced apart to form a third bypass flow channel. The third bypass flow channel includes a medium inlet and a medium outlet. The medium inlet communicates with the first bypass flow channel, and the medium outlet communicates with the second bypass flow channel.

[0011] The second valve core includes a valve core body and a moving part. The moving part has a first throttling orifice. At least a portion of the first throttling orifice is configured as a connecting part for connecting a third bypass flow channel and a second bypass flow channel. The moving part is movably disposed on the valve core body so that the area of ​​the connecting part is adjustable.

[0012] In the above scheme, the moving part is movable relative to the valve core body, thereby changing the area of ​​the connecting part. This allows the flow rate through the flow regulating valve to gradually change, changing the empty pipe flushing or water replenishment process of the downstream pipeline from the original impact type to the throttling and buffering type. This further reduces the pressure fluctuation amplitude, alleviates the valve opening water hammer, and makes the empty pipe flushing process of the downstream pipeline more stable. At the same time, it can reduce the probability of valve opening water hammer occurring at the flow regulating valve.

[0013] Optionally, the movable part is movably disposed on the valve core body so that at least a portion of the first throttling orifice is blocked by the inner circumferential surface of the second valve body and / or the inner circumferential surface of the second bypass pipe.

[0014] In the above scheme, the first throttling orifice on the moving part can be blocked by the inner circumferential surface of the second valve body and the inner circumferential surface of the second bypass pipe, thereby reducing the area of ​​the connecting part of the first throttling orifice, that is, changing the effective flow area of ​​the first throttling orifice, and thus changing the flow rate from the first bypass channel, the third bypass channel to the second bypass channel. This setting realizes the flow gradient regulation, so that the medium can slowly flow into the second sub-cavity of the first valve body through the bypass pipe, gradually balancing the pressure difference on both sides of the first valve body, and further reducing the pressure fluctuation amplitude.

[0015] Optionally, the first throttling orifice is constructed as an elongated orifice, with the length direction of the first throttling orifice parallel to the moving direction of the moving part.

[0016] In the above scheme, the length direction of the elongated orifice is parallel to the direction of movement, which means that the moving part can cover the entire first throttling orifice in a short stroke, thereby improving the flow rate adjustment range and facilitating the flow rate adjustment of the bypass pipeline.

[0017] Optionally, there are multiple first throttling orifices, which are arranged at intervals along the circumference of the moving part.

[0018] In the above scheme, multiple first throttling orifices are arranged at intervals along the circumference of the moving part. This arrangement enhances the flow regulation capability of the flow regulating valve on the one hand, and on the other hand, the total flow area of ​​the multiple first throttling orifices is equivalent to a single large orifice. However, the flow resistance distribution of the small orifice group is more uniform, and the turbulence degree when the fluid passes through is lower, which helps to improve the uniformity of medium flow.

[0019] Optionally, the moving part has a third chamber, and the maintenance valve further includes a connecting ring and a drive member connected to the connecting ring. The connecting ring is fixed to the moving part and located in the third chamber to divide the third chamber into a first sub-chamber and a second sub-chamber. The first sub-chamber communicates with a second bypass channel, and the connecting ring is provided with a through hole communicating with the first sub-chamber and the second sub-chamber.

[0020] In the above scheme, the first sub-chamber is connected to the second bypass channel, which means that the medium pressure can be directly applied to the first sub-chamber side of the connecting ring, while the second sub-chamber provides external driving force or feedback force through a driving component (such as a piston or cylinder). The presence of the through hole keeps the two sub-chambers in limited communication, avoids complete pressure isolation, and achieves pressure balance.

[0021] Optionally, the driving component includes a driving component body, a first link and a second link, one end of the first link is hinged to one end of the second link, the other end of the first link is connected to the driving end of the driving component body, and the other end of the second link is hinged to a connecting ring.

[0022] In the above scheme, the driving component body applies driving force to the connecting ring through the first and second connecting rods. The linear or rotational motion of the driving component body can be converted into the linear motion of the connecting ring through the angle change of the two connecting rods. Then, the moving part is moved by the connecting ring to realize the flow control of the flow regulating valve.

[0023] Alternatively, the maintenance valve body may be configured as a butterfly valve, ball valve, gate valve, or eccentric hemispherical valve.

[0024] Optionally, the first valve body includes a first sub-valve body, a second sub-valve body, and a third sub-valve body, with the third sub-valve body disposed between the first and second sub-valve bodies. The first sub-valve body defines a first sub-cavity, the second sub-valve body defines a second sub-cavity, and the first valve core is disposed within the third sub-valve body.

[0025] In the above scheme, the first sub-valve body, the second sub-valve body and the third sub-valve body can be assembled to form the first valve body, so that the components of the first valve body are relatively independent and easy to maintain. When the valve core is worn (such as scratches on the sealing surface) or stuck, only the middle third sub-valve body needs to be disassembled, without disassembling the entire valve and the upstream and downstream pipelines. The maintenance time is shortened and it is convenient to maintain and replace each component separately. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or 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 application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of some embodiments of this application;

[0028] Figure 2 This is a cross-sectional structural diagram of some other embodiments of this application;

[0029] Figure 3 for Figure 2 Enlarged cross-sectional view of the structure at point A in the middle;

[0030] Figure 4 This is a schematic diagram of the structure of the drive unit in some other embodiments of this application;

[0031] Figure 5 This is a schematic diagram of the overall structure in some other embodiments of the present application;

[0032] Figure 6 This is a schematic diagram of the overall structure in some other embodiments of the present application.

[0033] [Explanation of Labels in the Attached Image]

[0034] 100: First valve body; 100a: First sub-valve body; 100b: Second sub-valve body; 100c: Third sub-valve body; 110: First sub-cavity; 120: Second sub-cavity;

[0035] 200: First valve core;

[0036] 300: Voltage regulating component;

[0037] 310: Bypass pipe; 311: First bypass pipe; 312: Second bypass pipe;

[0038] 310a: Bypass channel; 311a: First bypass channel; 312a: Second bypass channel;

[0039] 320: Flow regulating and pressure regulating valve;

[0040] 321: Second valve body; 321a: Third bypass flow channel; 321b: Medium inlet; 321c: Medium outlet;

[0041] 322: Second valve core; 323: Valve core body; 324: Moving part; 324a: Third chamber; 324aa: First sub-chamber; 324ab: Second sub-chamber; 324b: First throttling orifice; 324c: Connecting part;

[0042] 325: Connecting ring; 325a: Through hole; 326: Driving component; 326a: Driving component body; 326b: First connecting rod; 326c: Second connecting rod. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] 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 pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0045] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0049] Valves, as key components in pipeline systems, are primarily used to control fluid flow. In various fields such as industry, urban water supply, and energy, valves play a crucial role in switching, regulating, and distributing fluids. Large-diameter gate valves, butterfly valves, and ball valves, which are on / off type maintenance valves, can be difficult to open, require high opening torque, experience excessive impact flow, or have poor flow control when there is a large pressure difference before and after opening.

[0050] In view of this, in order to reduce the occurrence of water hammer or severe pressure fluctuations when opening the valve, this application provides a maintenance valve. A bypass pipe 310 and a flow regulating and pressure regulating valve 320 are provided on the outside of the first valve body 100. The flow regulating and pressure regulating valve 320 is located in the bypass pipe 310 so that the flow rate of the medium in the bypass pipe 310 is adjustable. If the first valve body 100 is suddenly fully opened when the valve is opened, the flow velocity of the medium in the pipeline increases sharply, which can easily generate a pressure shock wave (water hammer) due to inertia. By adjusting the bypass flow rate in advance by the flow regulating and pressure regulating valve 320, the medium can first flow slowly into the downstream of the first valve body 100 through the bypass pipe 310, gradually balancing the pressure difference on both sides of the first valve body 100. The first valve body 100 is fully opened only after the upstream and downstream pressures are close, avoiding water hammer impact caused by sudden changes in flow velocity.

[0051] This design reduces the likelihood of unstable and drastic pressure fluctuations in the pipelines before and after the valve when the valve is fully open, especially under conditions of large pressure differentials between the pipelines before and after the valve, thus avoiding significant impact on downstream pipeline sections.

[0052] The maintenance valve proposed in the embodiments of this application is described below with reference to the accompanying drawings.

[0053] Please refer to Figure 1 and Figure 2According to the first aspect of the present application, the maintenance valve includes a maintenance valve body and a pressure regulating assembly 300. The maintenance valve body includes a first valve body 100 and a first valve core 200. It can be understood that the maintenance valve body can be a shut-off valve, which plays the role of on / off control.

[0054] The first valve body 100 has a first sub-cavity 110 and a second sub-cavity 120. It can be understood that the first sub-cavity 110 and the second sub-cavity 120 can be connected to the upstream pipeline and the downstream pipeline, respectively. That is, when the first valve body 100 is open, the fluid medium in the upstream pipeline flows from the first sub-cavity 110 to the second sub-cavity 120 and enters the downstream pipeline. During maintenance, the first sub-cavity 110 contains fluid medium, and the first valve body 100 is closed so that the second sub-cavity 120 no longer receives fluid medium.

[0055] Alternatively, the first sub-cavity 110 is connected to the downstream pipeline, and the second sub-cavity 120 is connected to the upstream pipeline. This application does not limit this. In this case, when the first valve body 100 is open, the fluid medium in the upstream pipeline flows from the second sub-cavity 120 to the first sub-cavity 110 and enters the downstream pipeline. During maintenance, the second sub-cavity 120 contains fluid medium, and the first valve body 100 is closed so that the first sub-cavity 110 no longer receives fluid medium.

[0056] The first valve core 200 is movably disposed within the first valve body 100 to connect or disconnect the first sub-cavity 110 and the second sub-cavity 120. In other words, the movement of the first valve core 200 enables the opening and closing of the first valve body 100, thereby connecting or disconnecting the first sub-cavity 110, which in turn allows the corresponding upstream and downstream pipelines to connect or disconnect.

[0057] The pressure regulating assembly 300 is disposed on the outside of the first valve body 100. The pressure regulating assembly 300 includes a bypass pipe 310 and a flow regulating and pressure regulating valve 320. The bypass pipe 310 can provide additional flow channels for the upstream and downstream pipelines, so that the fluid can bypass the first valve body 100 to flow.

[0058] The bypass pipe 310 has a bypass flow channel 310a, the two ends of which are connected to the first sub-cavity 110 and the second sub-cavity 120 respectively. That is, the bypass flow channel 310a is connected in parallel with the first valve body 100, thereby forming an independent pressure balance channel. This allows the fluid medium to flow from the first sub-cavity 110 to the second sub-cavity 120 without passing through the first valve core 200. It can be understood that by pre-adjusting the bypass flow rate through the flow regulating and pressure regulating valve 320, the medium can first flow slowly into the downstream of the main valve through the bypass pipe 310, gradually balancing the pressure difference on both sides of the main valve. After the upstream and downstream pressures are close, the main valve is fully opened, avoiding the water hammer impact force caused by the sudden change in flow velocity. At the same time, it reduces the torque when the first valve body 100 is opened, making it easier to open.

[0059] The flow regulating and pressure regulating valve 320 is installed in the bypass pipe 310 so that the flow rate of the medium in the bypass pipe 310 is adjustable. Before the first valve body 100 is opened, the flow regulating and pressure regulating valve 320 can be used to adjust the flow rate of the medium in the bypass pipe 310, so that the fluid medium flows between the first sub-cavity 110 and the second sub-cavity 120 through the bypass flow channel 310a, further reducing the pressure difference between the upstream and downstream passages.

[0060] In the above scheme, the flow regulating valve 320 can flexibly adjust the flow rate of the medium in the bypass pipe 310, achieving precise flow control at different stages of the opening and closing of the first valve body 100. Initially, the flow regulating valve 320 is opened with a small opening, allowing a small amount of medium to flow slowly and gradually balance the pressure. In the middle stage, the flow rate of the flow regulating valve 320 is appropriately increased according to pressure changes. Finally, the bypass is closed, allowing the first valve body 100 to be fully opened or closed under stable pressure, smoothly controlling pressure fluctuations throughout the process. Furthermore, different types of flow regulating valves 320 can be replaced according to the characteristics of the medium (such as viscosity and corrosiveness) to adapt to different operating conditions.

[0061] As an example, the pressure regulating and flow regulating valve can be a piston-type pressure regulating and flow regulating valve or a cone valve, and this application does not limit it.

[0062] As an example, the diameter of the flow regulating valve 320 is smaller than that of the first valve body 100, so that the flow rate of the bypass channel 310a is much lower than that of the first valve body 100. This avoids excessive flow in the bypass pipe 310 during regulation, facilitates the opening and closing of the flow regulating valve 320, and reduces the probability of water hammer impact when the flow regulating valve 320 regulates the pressure difference on both sides of the first valve body 100.

[0063] Meanwhile, for systems with large flow rates, there are multiple bypass pipes 310 and corresponding flow regulating and pressure regulating valves 320, and multiple sets of bypass pipes 310 with flow regulating and pressure regulating valves 320 are connected in parallel, thereby enabling buffering of more gradient flow rates.

[0064] Understandably, in high-flow-rate systems, the first valve body 100 may require different pressure balancing rates depending on operating conditions (such as normal start / stop vs. emergency shut-off). Multiple sets of parallel pressure regulating components 300 can be flexibly adjusted through combined control (such as PLC programming).

[0065] Meanwhile, if a pressure regulating component 300 stops operating due to blockage, seal failure, or drive failure, the other parallel pressure regulating components 300 can still continue to work and maintain basic pressure balance.

[0066] In other embodiments, please refer to Figure 1 and Figure 2The bypass pipe 310 includes a first bypass pipe 311 and a second bypass pipe 312. The bypass flow channel 310a includes a first bypass flow channel 311a and a second bypass flow channel 312a. The first bypass flow channel 311a is disposed in the first bypass pipe 311 and communicates with the first sub-cavity 110. The second bypass flow channel 312a is disposed in the second bypass pipe 312 and communicates with the second sub-cavity 120. The flow regulating and pressure regulating valve 320 is disposed between the first bypass pipe 311 and the second bypass pipe 312 so that the first bypass flow channel 311a and the second bypass flow channel 312a can be selectively connected.

[0067] In the above scheme, the first bypass channel 311a connects to the first sub-cavity 110, and the second bypass channel 312a connects to the second sub-cavity 120. Through the selective connection of the flow regulating valve 320, the flow control of the fluid medium between the first sub-cavity 110 and the second sub-cavity 120 can be achieved. If the first valve body 100 suddenly opens completely when the valve is opened, the flow velocity of the medium in the pipeline increases sharply, which can easily generate pressure shock waves (water hammer) due to inertia. By pre-adjusting the bypass flow rate through the flow regulating valve 320, the medium can first flow slowly into the downstream of the main valve through the bypass pipe 310, gradually balancing the pressure difference on both sides of the main valve. The main valve is then fully opened only after the upstream and downstream pressures are close, avoiding water hammer impact caused by sudden changes in flow velocity.

[0068] In other embodiments, please refer to Figure 2 and Figure 3 The flow regulating and pressure regulating valve 320 includes a second valve body 321 and a second valve core 322 located within the second valve body 321. At least a portion of the inner surface of the second valve body 321 and the outer surface of the second valve core 322 are spaced apart to form a third bypass flow channel 321a. The third bypass flow channel 321a includes a medium inlet 321b and a medium outlet 321c. The medium inlet is connected to the first bypass flow channel 311a, and the medium outlet 321c is connected to the second bypass flow channel 312a. This configuration clarifies the flow direction of the fluid medium, ensuring that the fluid medium moves along a preset path, thereby achieving rapid pressure regulation.

[0069] The second valve core 322 includes a valve core body 323 and a moving part 324. The moving part 324 has a first throttling orifice 324b. At least part of the first throttling orifice 324b is configured as a connecting part 324c. The connecting part 324c is used to connect the third bypass channel 321a and the second bypass channel 312a. That is, after the fluid medium flows from the first sub-cavity 110 to the first bypass channel 311a, it enters the third bypass channel 321a through the medium inlet 321b, and then flows to the second bypass channel 312a through the medium outlet 321c. It can then flow into the second sub-cavity 120 through the second bypass channel 312a, thereby realizing the transfer of the medium between the first sub-cavity 110 and the second sub-cavity 120, reducing the pressure difference between the first sub-cavity 110 and the second sub-cavity 120, reducing the pressure fluctuation amplitude, and reducing the fluid impact when the first valve body 100 is opened.

[0070] The movable part 324 is movably disposed on the valve core body 323 so that the area of ​​the connecting part 324c is adjustable. That is, the movable part 324 is movable relative to the valve core body 323, thereby changing the area of ​​the connecting part 324c. This allows the flow rate through the flow regulating valve 320 to be gradually changed, so that the flushing or replenishing process of the downstream pipeline changes from the original impact type to the throttling and buffering type. This further reduces the pressure fluctuation amplitude, reduces the opening water hammer, and makes the flushing process of the downstream pipeline from violent to stable. At the same time, it can reduce the probability of opening water hammer occurring at the flow regulating valve 320.

[0071] In other embodiments, please refer to Figure 2 and Figure 3 The movable part 324 is movably disposed on the valve core body 323 so that at least a portion of the first throttling orifice 324b is blocked by the inner circumferential surface of the second valve body 321 and / or the inner circumferential surface of the second bypass pipe 312. That is, when the movable part 324 moves relative to the valve core body 323, a portion of the inner circumferential surface of the second valve body 321 can block at least a portion of the first throttling orifice 324b, thereby reducing the area of ​​the connecting portion 324c of the first throttling orifice 324b, i.e. changing the effective flow area of ​​the first throttling orifice 324b, thereby changing the flow rate from the first bypass channel 311a, the third bypass channel 321a to the second bypass channel 312a. This configuration achieves flow gradient regulation, allowing the medium to slowly flow into the second sub-cavity 120 of the first valve body 100 through the bypass pipe 310, gradually balancing the pressure difference on both sides of the first valve body 100, and further reducing the pressure fluctuation amplitude.

[0072] Alternatively, a portion of the moving part 324 can extend into the second bypass pipe 312. As the moving part 324 moves relative to the valve core body 323, it gradually extends into the second bypass pipe 312, causing the first throttling orifice 324b on the moving part 324 to be gradually blocked by the inner circumferential surface of the second bypass pipe 312. This reduces the area of ​​the connecting portion 324c of the first throttling orifice 324b, thus changing the effective flow area of ​​the first throttling orifice 324b. This, in turn, changes the flow rate from the first bypass channel 311a, the third bypass channel 321a to the second bypass channel 312a. This configuration achieves flow gradient regulation, allowing the medium to slowly flow into the second sub-cavity 120 of the first valve body 100 via the bypass pipe 310, gradually balancing the pressure difference on both sides of the first valve body 100, and further reducing the pressure fluctuation amplitude.

[0073] Alternatively, a portion of the moving part 324 can extend into the second bypass pipe 312. Simultaneously, when the moving part 324 moves relative to the valve core body 323, a portion of the moving part 324 enters the second bypass pipe 312, and a portion of the first throttling orifice 324b on the moving part 324 is blocked by the inner circumferential surface of the second bypass pipe 312. Another portion of the moving part 324 is blocked by the inner circumferential surface of the second valve body 321. This results in a situation where a portion of the first throttling orifice 324b on the moving part 324 is blocked by the inner circumferential surface of the second bypass pipe 312, and the other portion is blocked by the inner circumferential surface of the second valve body 321. Thus, the first throttling orifice on the moving part 324... 324b is simultaneously blocked by the inner circumferential surface of the second valve body 321 and the inner circumferential surface of the second bypass pipe 312, thereby reducing the effective area of ​​the connecting portion 324c of the first throttling orifice 324b, that is, changing the effective flow area of ​​the first throttling orifice 324b, thereby changing the flow rate from the first bypass channel 311a, the third bypass channel 321a to the second bypass channel 312a. This setting achieves flow gradient regulation, allowing the medium to slowly flow into the second sub-cavity 120 of the first valve body 100 through the bypass pipe 310, gradually balancing the pressure difference on both sides of the first valve body 100, and further reducing the pressure fluctuation amplitude.

[0074] As an example, the first throttling orifice 324b can be constructed as a circular orifice, a rectangular orifice, etc., and this application does not limit it in this regard.

[0075] In the above scheme, when the moving part 324 moves, the inner circumferential surface of the second valve body 321 or the second bypass pipe 312 gradually blocks the first throttling orifice 324b. During the blocking process, the first throttling orifice 324b will not be completely blocked or opened instantly, but the flow area of ​​the connecting part 324c will be gradually changed by the displacement of the moving part 324. This setting realizes the flow gradient adjustment, so that the medium can slowly flow into the second sub-cavity 120 of the first valve body 100 through the bypass pipe 310, gradually balancing the pressure difference on both sides of the first valve body 100, and further reducing the pressure fluctuation amplitude.

[0076] In other embodiments, please refer to Figure 2 and Figure 3 The first throttling orifice 324b is constructed as an elongated orifice, and the length direction of the first throttling orifice 324b is parallel to the moving direction of the moving part 324.

[0077] In the above scheme, the first throttling orifice 324b is constructed as an elongated orifice. That is, the cross-sectional shape of the first throttling orifice 324b along its radial direction is elongated, and the length direction is parallel to the moving direction of the moving part 324. This makes the relationship between flow rate and displacement approximately linear when the pressure difference is stable, which is convenient for the control system (such as PLC, PID algorithm) to achieve precise adjustment.

[0078] Furthermore, the length direction of the elongated orifice is parallel to the direction of movement, which means that the moving part 324 can cover the entire first throttling orifice 324b in a short stroke, thereby improving the flow rate adjustment range and facilitating the flow rate adjustment of the pressure regulating component 300.

[0079] In other embodiments, please refer to Figure 2 and Figure 3 There are multiple first throttling orifices 324b, which are arranged at intervals along the circumference of the moving part 324.

[0080] In the above scheme, multiple first throttling orifices 324b are arranged at intervals along the circumference of the moving part 324. This arrangement enhances the flow regulation capability of the flow regulating valve 320. On the other hand, the total flow area of ​​the multiple first throttling orifices 324b is equivalent to a single large orifice, but the flow resistance distribution of the small orifice group is more uniform, and the turbulence degree when the fluid passes through is lower, which helps to improve the uniformity of medium flow.

[0081] Furthermore, multiple first throttling orifices 324b are distributed circumferentially, allowing fluid to flow in or out uniformly from different directions, avoiding flow deviation caused by a single orifice. For example, when the moving part 324 rotates or translates, the flow area of ​​each orifice changes synchronously, the fluid is subjected to balanced forces in the circumferential direction, reducing local high-pressure areas or eddies, and improving flow field stability. This is especially suitable for systems sensitive to flow fluctuations (such as hydraulic servo systems and precision cooling circuits).

[0082] Meanwhile, the adjustment of a single elongated orifice may cause a sudden change in flow rate due to the non-linear change in opening, while multiple circumferential orifices, through a superposition effect, can make the total flow area exhibit a smoother linear change with the displacement of the moving part 324. For example, when the moving part 324 moves, some of the first throttling orifices 324b are gradually blocked or opened, and the total flow area of ​​the connection part of multiple first throttling orifices 324b increases or decreases proportionally to the number of orifices, which facilitates the control system to accurately match the flow demand (such as in PID control scenarios).

[0083] In other embodiments, please refer to Figure 2 and Figure 3 The moving part 324 has a third chamber 324a. The maintenance valve also includes a connecting valve and a drive member 326 connected to the connecting ring 325. The connecting ring 325 is fixed to the moving part 324 and located in the third chamber 324a to divide the third chamber 324a into a first sub-chamber 324aa and a second sub-chamber 324ab. The first sub-chamber 324aa communicates with the second bypass channel 312a. The connecting ring 325 is provided with a through hole 325a that communicates with the first sub-chamber 324aa and the second sub-chamber 324ab.

[0084] In the above scheme, the first sub-chamber 324aa is connected to the second bypass channel 312a, which means that the medium pressure can be directly applied to the first sub-chamber 324aa side of the connecting ring 325, while the second sub-chamber 324ab is provided with external driving force or feedback force through the driving component 326 (such as piston or cylinder). The presence of the through hole 325a keeps the two sub-chambers in limited communication, avoids complete pressure isolation, and achieves pressure balance.

[0085] This design avoids excessive force on one side of the connecting ring 325 due to high pressure of the fluid medium, reducing the probability of jamming between the moving part 324 and the second valve body 321. The through hole 325a can balance the pressure difference on both sides of the connecting ring 325, reducing frictional resistance. At the same time, when the drive member 326 is activated, the through hole 325a can balance the pressure on both sides of the connecting ring 325, reducing the response delay of the drive member 326 in the sealed chamber caused by fluid pressure. It also reduces the pressure difference inside the second valve core 322, reducing the pressure difference load on the valve core and helping to improve the reliability of the device.

[0086] In other embodiments, please refer to Figures 3 and 4. Figure 4 The driving component 326 includes a driving component body 326a, a first connecting rod 326b, and a second connecting rod 326c. One end of the first connecting rod 326b is hinged to one end of the second connecting rod 326c, and the other end of the first connecting rod 326b is connected to the driving end of the driving component body 326a. The other end of the second connecting rod 326c is hinged to the connecting ring 325.

[0087] In the above scheme, the driving component body 326a applies driving force to the connecting ring 325 through the first connecting rod 326b and the second connecting rod 326c. The linear or rotational motion of the driving component body 326a can be converted into the linear motion of the connecting ring 325 through the angle change of the two connecting rods. Then, the moving part 324 is moved by the connecting ring 325 to realize the flow control of the flow regulating valve 320. By adjusting the length ratio of the first connecting rod 326b and the second connecting rod 326c, the movable stroke of the moving part 324 can be changed, thereby facilitating the adjustment of the throttling capacity of the flow regulating valve 320.

[0088] In a specific embodiment, the drive body 326a, the first link 326b, and the second link 326c are located inside the valve core body 323 and at least partially within the third chamber 324a of the moving part 324, thereby reducing the influence of liquid pressure on the regulation process.

[0089] In other embodiments, please refer to Figure 1 and Figure 2 The first valve body 100 includes a first sub-valve body 100a, a second sub-valve body 100b, and a third sub-valve body 100c. The third sub-valve body 100c is disposed between the first sub-valve body 100a and the second sub-valve body 100b. The first sub-valve body 100a defines a first sub-cavity 110, and the second sub-valve body 100b defines a second sub-cavity 120. The first valve core 200 is disposed within the third sub-valve body 100c. In other words, the first sub-valve body 100a, the second sub-valve body 100b, and the third sub-valve body 100c can be assembled to form the first valve body 100, making each component of the first valve body 100 relatively independent and easy to maintain. When the valve core is worn (such as scratches on the sealing surface) or stuck, only the intermediate third sub-valve body 100c needs to be disassembled, without disassembling the entire valve and the upstream and downstream pipelines. The maintenance time is shortened, and it is convenient to maintain and replace each component separately.

[0090] The first sub-valve body 100a and the second sub-valve body 100b of the same specification can be adapted to the third sub-valve body 100c with different functions (such as shut-off valve core, throttle valve core, check valve core). The valve type can be changed by replacing the third sub-valve body 100c in the middle section (such as changing from a regulating valve to a shut-off valve, only the third sub-valve body 100c component needs to be replaced), thus improving the versatility of the equipment.

[0091] In other embodiments, the maintenance valve body is configured as a butterfly valve, ball valve, gate valve, or eccentric hemispherical valve.

[0092] As an example, a butterfly valve is a type of valve whose closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing. It is also called a flap valve. It is a simple regulating valve that can be used for on / off control of low-pressure pipeline media.

[0093] As an example, a ball valve is a valve in which the opening and closing element (ball) is driven by the valve stem and rotates around the valve axis. It can also be used for fluid regulation and control. Hard-seal V-type ball valves, with their V-shaped ball core and hard alloy-faced metal seat, possess strong shearing force, making them particularly suitable for media containing fibers or small solid particles. Multi-port ball valves in pipelines can flexibly control the merging, splitting, and switching of flow directions of media, and can also close any channel while connecting two other channels. These types of valves should generally be installed horizontally in pipelines. Ball valves are classified according to their actuation method: pneumatic ball valves, electric ball valves, and manual ball valves.

[0094] As an example, please refer to Figure 5 The maintenance valve body is constructed as a gate valve. A gate valve is a valve with a gate as its opening and closing element. The direction of the gate's movement is perpendicular to the direction of fluid flow. Gate valves can only be fully open or fully closed; they cannot be used for regulation or throttling. Gate valves achieve sealing through the contact between the valve seat and the gate. The sealing surface is usually overlaid with metal materials to increase wear resistance, such as 1Cr13, STL6, or stainless steel. Gates can be rigid or resilient; based on the type of gate, gate valves are classified as rigid gate valves or resilient gate valves.

[0095] Please refer to Figure 6 The maintenance valve body is constructed as an eccentric hemispherical valve. An eccentric hemispherical valve is a type of ball valve that relies on rotating a valve chain to open or close the valve. It uses an eccentric crankshaft, causing the center line of the ball crown to deviate from the center line of the valve flow channel by an eccentric distance. When the valve is opened, the crankshaft rotates through a very small angle, causing the ball crown to leave the valve seat, and the ball crown and valve seat no longer contact each other. Conversely, during valve closing, the ball crown only contacts the valve seat at the moment of closure.

[0096] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0097] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0098] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0099] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A maintenance valve, characterized in that, include: The maintenance valve body includes a first valve body and a first valve core, wherein the first valve body has a first sub-cavity and a second sub-cavity; The first valve core is movably disposed within the first valve body to connect or disconnect the first sub-cavity and the second sub-cavity; A pressure regulating assembly is disposed on the outside of the first valve body. The pressure regulating assembly includes a bypass pipe and a flow regulating valve. The bypass pipe has a bypass flow channel, and the two ends of the bypass flow channel are respectively connected to the first sub-cavity and the second sub-cavity. The flow regulating and pressure regulating valve is disposed in the bypass pipe to make the medium flow rate in the bypass pipe adjustable. The flow regulating and pressure regulating valve includes a second valve body and a second valve core located in the second valve body. At least a portion of the inner surface of the second valve body and the outer surface of the second valve core are spaced apart to form a third bypass flow channel. The third bypass flow channel includes a medium inlet and a medium outlet. The bypass flow channel includes a first bypass flow channel and a second bypass flow channel. The medium inlet is connected to the first bypass flow channel, and the medium outlet is connected to the second bypass flow channel. The second valve core includes a valve core body and a movable part. The movable part has a first throttling orifice, at least a portion of which is configured as a connecting part. The connecting part is used to connect the third bypass flow channel and the second bypass flow channel. The movable part is movably disposed on the valve core body so that the area of ​​the connecting part is adjustable.

2. The maintenance valve according to claim 1, characterized in that, The bypass pipe includes a first bypass pipe and a second bypass pipe. The first bypass channel is disposed in the first bypass pipe and communicates with the first sub-cavity. The second bypass channel is disposed in the second bypass pipe and communicates with the second sub-cavity. The flow regulating and pressure regulating valve is disposed between the first bypass pipe and the second bypass pipe so that the first bypass channel and the second bypass channel can be selectively connected.

3. The maintenance valve according to claim 2, characterized in that, The movable part is movably disposed on the valve core body so that at least a portion of the first throttling orifice is blocked by the inner circumferential surface of the second valve body and / or the inner circumferential surface of the second bypass pipe.

4. The maintenance valve according to claim 1, characterized in that, The first throttling orifice is constructed as an elongated orifice, and the length direction of the first throttling orifice is parallel to the moving direction of the moving part.

5. The maintenance valve according to claim 4, characterized in that, There are multiple first throttling orifices, which are arranged at intervals along the circumference of the moving part.

6. The maintenance valve according to claim 1, characterized in that, The moving part has a third chamber, and the flow regulating and pressure regulating valve further includes a connecting ring and a driving member connected to the connecting ring. The connecting ring is fixed to the moving part and located in the third chamber to divide the third chamber into a first sub-chamber and a second sub-chamber. The first sub-chamber is connected to the second bypass channel, and the connecting ring is provided with a through hole connecting the first sub-chamber and the second sub-chamber.

7. The maintenance valve according to claim 6, characterized in that, The driving component includes a driving component body, a first connecting rod, and a second connecting rod. One end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the first connecting rod is connected to the driving end of the driving component body, and the other end of the second connecting rod is hinged to the connecting ring.

8. The maintenance valve according to any one of claims 1-7, characterized in that, The main body of the maintenance valve is constructed as a butterfly valve, ball valve, gate valve, or eccentric hemispherical valve.

9. The maintenance valve according to claim 1, characterized in that, The first valve body includes a first sub-valve body, a second sub-valve body, and a third sub-valve body. The third sub-valve body is disposed between the first sub-valve body and the second sub-valve body. The first sub-valve body defines a first sub-cavity, the second sub-valve body defines a second sub-cavity, and the first valve core is disposed within the third sub-valve body.

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