Differential pressure communication device

Abstract

The utility model relates to the technical field of valves, and provides a differential pressure communication device which comprises a first stepped hole, a second stepped hole and a pressure sensor. The first valve core is mounted in the first hole section in a sliding manner; the first elastic piece is arranged in the first hole section and abuts against the end, away from the second hole section, of the first valve element. The second stepped hole comprises a third hole section and a fourth hole section; the second valve core is mounted in the third hole section in a sliding manner; the second elastic piece is arranged in the third hole section and abuts against the end, away from the fourth hole section, of the second valve element. The first hole section and the fourth hole section are communicated with each other to form a first communicating body, and the second hole section and the third hole section are communicated with each other to form a second communicating body; a first valve port communicating with the first communicating body; the second valve port is communicated with the second communication body. The pressure difference communication device is installed on the backflow pipeline, and potential safety hazards generated when the safety valve is switched from the closed state to the open state can be greatly reduced.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and further to a pressure difference communication device. Background Art

[0002] Generally speaking, a safety valve is installed in the transmission pipeline, and a pressure regulating valve is provided downstream of the safety valve. A return line is provided downstream of the pressure regulating valve, and the return line is connected to the upstream safety valve. When the pressure regulating valve fails or other abnormal conditions occur in the downstream pipeline, causing the pressure in the downstream pipeline to exceed the allowable value, the return line will transmit the pressure in the downstream pipeline back to the upstream safety valve. At this time, the safety valve is closed, thereby blocking the connection between the upstream pipeline and the downstream pipeline, and maintenance personnel can repair or replace the pressure regulating valve. After the failure of the pressure regulating valve is solved, before the downstream pipeline is ventilated or liquid is passed normally, the pressure limit of the pressure regulating valve needs to be debugged several times to make the downstream pressure of the pressure regulating valve reach the allowable value. When the pressure limit of the pressure regulating valve reaches the allowable value, the upstream safety valve is opened. This kind of safety valve opening logic has safety hazards. For example, if there are other abnormal conditions that have not been discovered in the downstream pipeline, opening the safety valve at this time will cause safety hazards due to the large allowable value of the downstream pipeline. Ideally, a pressure differential connecting device is installed on the return pipeline. The pressure differential connecting device can set the pressure difference. The safety valve can only be reopened when the pressure difference between the pressure in the safety valve and the pressure in the downstream pipeline is greater than the pressure difference set in the pressure differential connecting device. In other words, the safety valve can only be reopened when the pressure in the downstream pipeline is lower than the allowable value under normal circumstances and reaches a certain level. This will greatly reduce safety hazards.

[0003] Therefore, the market is in urgent need of a solution with a pressure difference function that will not affect the overpressure closing function of the safety valve. Utility Model Content

[0004] In order to solve the above problems, the present application provides a pressure differential connection device with ingenious design and simple structure. By installing the pressure differential connection device of the present application in the return line, after the safety valve is closed due to abnormal pressure in the downstream pipeline, the pressure in the downstream pipeline must drop to a certain level, so that the pressure difference between the pressure in the safety valve and the pressure in the downstream pipeline is greater than the pressure difference set in the pressure differential connection device, the safety valve can be reopened, which greatly reduces the safety hazard when the safety valve switches from a closed state to an open state. After the pressure differential connection device is installed in the return line, it will not affect the normal overpressure closing of the safety valve. The technical solution adopted in the present application is as follows:

[0005] A pressure difference communication device, comprising:

[0006] A first valve body, wherein the first valve body is provided with a first stepped hole, wherein the first stepped hole includes a first hole section and a second hole section, wherein the diameter of the first hole section is larger than that of the second hole section; a first valve core, wherein the first valve core is slidably mounted in the first hole section, and the communication between the first hole section and the second hole section can be blocked or opened by sliding the first valve core in the first hole section; and a first elastic member, wherein the first elastic member is disposed in the first hole section and pushes against an end of the first valve core away from the second hole section;

[0007] a second valve body, the second valve body being provided with a second stepped hole, the second stepped hole comprising a third hole section and a fourth hole section, the diameter of the third hole section being larger than that of the fourth hole section; a second valve core, the second valve core being slidably mounted in the third hole section, and the communication between the third hole section and the fourth hole section can be blocked or opened by sliding the second valve core in the third hole section; a second elastic member, the second elastic member being arranged in the third hole section and pushing against an end of the second valve core away from the fourth hole section;

[0008] The first hole section and the fourth hole section are interconnected to form a first connecting body, and the second hole section and the third hole section are interconnected to form a second connecting body; a first valve port, the first valve port is connected to the first connecting body; a second valve port, the second valve port is connected to the second connecting body.

[0009] By installing the pressure differential connection device of the present application in the return pipeline, after the safety valve is closed due to abnormal pressure in the downstream pipeline, the pressure in the downstream pipeline must drop to a certain level, so that the pressure difference between the pressure in the safety valve and the pressure in the downstream pipeline is greater than the pressure difference set in the pressure differential connection device, the safety valve can be reopened, which greatly reduces the safety hazard when the safety valve switches from the closed state to the open state. In addition, after installing the pressure differential connection device in the return pipeline, it will not affect the normal overpressure closing of the safety valve, that is, the pressure differential connection device does not affect the normal function of the return pipeline.

[0010] In some embodiments, the first valve body, the second valve body, the first valve port, and the second valve port are all disposed on the same valve body.

[0011] By arranging the first valve body, the second valve body, the first valve port and the second valve port in the same valve body body, the integrity of the first valve body, the second valve body, the first valve port and the second valve port can be ensured, and the risk of separation of the four can be reduced.

[0012] In some embodiments, the first connecting body and the second connecting body are both disposed on the valve body.

[0013] By arranging both the first connecting body and the second connecting body in the valve body, that is, the pipeline connecting the first hole segment and the fourth hole segment and the pipeline connecting the second hole segment and the third hole segment are both arranged in the valve body, compared with arranging the pipeline outside the valve body, the built-in pipeline can save the pipeline disassembly and assembly process, and the built-in pipeline can greatly reduce the risk of pipeline leakage.

[0014] In some embodiments, the second valve port is disposed at an end of the third hole segment away from the fourth hole segment, a hollow first pressure block is disposed in the third hole segment, and the first pressure block abuts against an end of the second elastic member away from the second valve core.

[0015] By arranging the second valve port at one end of the third hole segment, that is, using the opening of one end of the third hole segment as the second valve port, the process of separately opening the second valve port is saved.

[0016] In some embodiments, the third hole segment is a stepped hole structure, the first pressing block is a stepped shaft structure adapted to the third hole segment, and a shaft shoulder of the first pressing block abuts against a hole shoulder of the third hole segment.

[0017] By setting the third hole segment as a stepped hole structure and setting the first pressure block as a stepped shaft structure, the first pressure block and the third hole segment form a limited fit. When the shaft shoulder of the first pressure block abuts against the hole shoulder of the third hole segment, the first pressure block cannot continue to penetrate along the third hole segment. At this time, it means that the first pressure block has reached the expected position, which improves the installation efficiency of the first pressure block.

[0018] In some embodiments, an adjusting screw is threaded in the first hole section, the adjusting screw abuts against an end of the first elastic member away from the first valve core, and the adjusting screw is used to adjust the elastic force of the first elastic member.

[0019] By setting an adjusting screw, the elastic force provided by the first elastic member to the first valve core can be adjusted, thereby achieving adjustment of the pressure difference in the pressure differential connecting device. In other words, the specific value of the pressure difference in the pressure differential connecting device can be set by the adjusting screw, thereby improving the adaptability of the pressure differential connecting device.

[0020] In some embodiments, a locking screw is threaded in the first hole segment, and the locking screw abuts against an end of the adjusting screw away from the first elastic member.

[0021] By setting a locking screw, the adjusting screw can be limited to reduce the risk of the adjusting screw loosening.

[0022] In some embodiments, a central axis of the first stepped hole, a central axis of the second stepped hole, a central axis of the first valve port, and a central axis of the second valve port are parallel to each other.

[0023] By making the central axis of the first stepped hole, the central axis of the second stepped hole, the central axis of the first valve port and the central axis of the second valve port parallel to each other, the size of the valve body in a direction perpendicular to the central axis of the first stepped hole can be greatly reduced.

[0024] In some embodiments, the first valve port and the second valve port are both adapted to a sealing tube with a thread model of R1 / 4.

[0025] The first valve port and the second valve port are both adapted to a sealing tube with a thread model of R1 / 4, and the sealing tube with a thread model of R1 / 4 is more commonly used, which can improve the versatility of the first valve port and the second valve port.

[0026] In some embodiments, the first elastic member and the second elastic member are linear springs.

[0027] The pressure difference communication device provided in the present application has at least one of the following beneficial effects:

[0028] 1. The application provides a pressure differential connection device. By installing the pressure differential connection device in the return line, after the safety valve is closed due to abnormal pressure in the downstream line, the pressure in the downstream line must drop to a certain level, so that the pressure difference between the pressure in the safety valve and the pressure in the downstream line is greater than the pressure difference set in the pressure differential connection device, the safety valve can be reopened, which greatly reduces the safety hazard when the safety valve switches from a closed state to an open state. In addition, after installing the pressure differential connection device in the return line, it will not affect the normal overpressure closing of the safety valve, that is, the pressure differential connection device does not affect the normal function of the return line.

[0029] 2. The present application provides a pressure differential connecting device, which ensures the integrity of the first valve body, the second valve body, the first valve port and the second valve port by arranging the first valve body, the second valve body, the first valve port and the second valve port on the same valve body body, thereby reducing the risk of separation of the four.

[0030] 3. The present application provides a pressure difference connecting device, in which the first connecting body and the second connecting body are both arranged in the valve body, that is, the pipeline connecting the first hole segment and the fourth hole segment and the pipeline connecting the second hole segment and the third hole segment are both arranged in the valve body. Compared with arranging the pipeline outside the valve body, the built-in pipeline can save the pipeline disassembly and assembly process, and the built-in pipeline can greatly reduce the risk of pipeline leakage.

[0031] 4. The pressure difference communication device provided in the present application saves the process of separately opening the second valve port by setting the second valve port at one end of the third hole segment, that is, using the opening of one end of the third hole segment as the second valve port.

[0032] 5. The present application provides a pressure differential connecting device, in which the third hole segment is set as a stepped hole structure and the first pressure block is set as a stepped shaft structure. The first pressure block forms a limited fit with the third hole segment. When the shaft shoulder of the first pressure block abuts against the hole shoulder of the third hole segment, the first pressure block cannot continue to penetrate along the third hole segment. At this time, it indicates that the first pressure block has reached the expected position, which improves the installation efficiency of the first pressure block.

[0033] 6. The present application provides a pressure differential connecting device, which can adjust the elastic force provided by the first elastic member to the first valve core by setting an adjusting screw, thereby achieving the adjustment of the pressure difference in the pressure differential connecting device. That is to say, the specific value of the pressure difference in the pressure differential connecting device can be set by the adjusting screw, thereby improving the adaptability of the pressure differential connecting device.

[0034] 7. The pressure difference communication device provided in the present application can limit the adjusting screw by setting a locking screw, thereby reducing the risk of the adjusting screw loosening.

[0035] 8. The present application provides a pressure differential connecting device, which can greatly reduce the size of the valve body in a direction perpendicular to the center axis of the first step hole by making the center axis of the first step hole, the center axis of the second step hole, the center axis of the first valve port and the center axis of the second valve port parallel to each other.

[0036] 9. The present application provides a pressure differential connecting device, in which the first valve port and the second valve port are both compatible with a sealing tube with a thread model of R1 / 4, and the sealing tube with a thread model of R1 / 4 is more commonly used, which can improve the versatility of the first valve port and the second valve port. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The following will explain the preferred implementation mode in a clear and understandable manner in conjunction with the accompanying drawings to further illustrate the above characteristics, technical features, advantages and implementation methods of a pressure difference communication device:

[0038] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0039] Figure 2 This is a flow chart of the embodiment of the present application after installation.

[0040] Description of Figure Numbers:

[0041] The first hole section 1, the second hole section 2, the first valve core 3, the first elastic member 4, the third hole section 5, the fourth hole section 6, the second valve core 7, the second elastic member 8, the first connecting body 9, the second connecting body 10, the first valve port 11, the second valve port 12, the valve body 13, the first pressure block 14, the adjusting screw 15, the locking screw 16, the safety valve 17, the pressure regulating valve 18, and the pressure difference connecting device 19. DETAILED DESCRIPTION

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0043] In order to simplify the drawings, only the parts related to the present application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0044] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0045] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0047] refer to Figure 1 , the present application provides a pressure difference communication device, comprising:

[0048] A first valve body is provided with a first stepped hole, the first stepped hole includes a first hole section 1 and a second hole section 2, the diameter of the first hole section 1 is larger than that of the second hole section 2; a first valve core 3 is slidably installed in the first hole section 1, and the communication between the first hole section 1 and the second hole section 2 can be blocked or opened by sliding the first valve core 3 in the first hole section 1; a first elastic member 4 is provided in the first hole section 1, and the first elastic member 4 pushes against an end of the first valve core 3 away from the second hole section 2;

[0049] A second valve body is provided with a second stepped hole, the second stepped hole includes a third hole section 5 and a fourth hole section 6, the diameter of the third hole section 5 is larger than that of the fourth hole section 6; a second valve core 7 is slidably installed in the third hole section 5, and the communication between the third hole section 5 and the fourth hole section 6 can be blocked or opened by sliding the second valve core 7 in the third hole section 5; a second elastic member 8 is provided in the third hole section 5, and the second elastic member 8 pushes against an end of the second valve core 7 away from the fourth hole section 6;

[0050] The first hole section 1 and the fourth hole section 6 are interconnected to form a first connecting body 9, and the second hole section 2 and the third hole section 5 are interconnected to form a second connecting body 10; the first valve port 11, the first valve port 11 is connected to the first connecting body 9; the second valve port 12, the second valve port 12 is connected to the second connecting body 10.

[0051] Specifically, refer to Figure 2 , the application scenario of the present application is explained by taking the gas pipeline as an example, the pressure regulating valve 18 is arranged downstream of the safety valve 17, the downstream pipeline of the pressure regulating valve 18 is connected to the first valve port 11, and the second valve port 12 of the pressure difference connecting device 19 is connected to the upstream safety valve 17, that is, the pressure difference connecting device 19 is installed on the return pipeline between the safety valve 17 and the downstream pipeline. The combined effect of the first valve body, the first valve core 3 and the second elastic member 8 is equivalent to a one-way valve, and the combined effect of the second valve body, the second valve core 7 and the second elastic member 8 is also equivalent to a one-way valve. It can be understood that the elastic coefficient of the second elastic member 8 is very small, and the pressure applied by the second elastic member 8 to the second valve core 7 is very small, for example, 0.002Mpa. The second elastic member 8 is only arranged for the one-way opening of the second valve core 7. When the pressure of the first valve port 11 is slightly greater than the pressure of the second valve port 12, the second valve core 7 can be pushed open, and the fourth hole section 6 is connected to the third hole section 5. Different from the second elastic member 8, the first elastic member 4 not only plays the role of enabling the first valve core 3 to be opened in one direction, but also provides a relatively large pressure to the first valve core 3, for example, 0.5Mpa. That is to say, when the pressure of the first valve port 11 plus the pressure provided by the first elastic member 4 to the first valve core 3 is less than the pressure of the second valve port 12, the first valve core 3 can be pushed open, and the second hole section 2 is connected to the first hole section 1.

[0052] Assume that the pressure of the first valve port 11 is P1, the pressure provided by the first elastic member 4 to the first valve core 3 is P2, the pressure of the second valve port 12 is P3, and the pressure provided by the second elastic member 8 to the second valve core 7 can be ignored. It is easy to understand that the pressure of the first connecting body 9 is P1, and the pressure of the second connecting body 10 is P3. When the pressure regulating valve 18 in the downstream pipeline fails and cannot control the pressure of the downstream pipeline, so that the pressure of the downstream pipeline exceeds the allowable value, P1 is greater than P3 at this time, and the fourth hole section 6 is connected to the third hole section 5, that is, the first valve port 11 is connected to the second valve port 12, and the safety valve 17 is closed due to overpressure, and P1+P2 is greater than P3. At this time, the second hole section 2 will not be connected to the first hole section 1; when the pressure regulating valve 18 is repaired, if the pressure of the downstream pipeline has not decreased compared to before the safety valve 17 is closed, it is easy to understand that the safety valve 17 will still be closed due to overpressure. If the pressure of the downstream pipeline is lower than that before the safety valve 17 is closed, but P1 is less than P3 and P1+P2 is greater than P3, the entire pressure difference connecting device 19 is not conductive at this time, and the overpressure of the safety valve 17 cannot be released, so the safety valve 17 is still in a closed state, that is, the safety valve 17 cannot be opened. If the pressure of the downstream pipeline drops more than that before the safety valve 17 is closed, and the reduced pressure exceeds P2, at this time, because P3 is greater than P1+P2, the fourth hole section 6 cannot be connected to the third hole section 5, but the second hole section 2 is connected to the first hole section 1, and the pressure of the safety valve 17 is released. The safety valve 17 is opened, and gas or liquid will be introduced into the downstream pipeline at this time. Through the above description of the working principle of the pressure difference connecting device 19, it can be understood that when the safety valve 17 is closed due to overpressure and after the pressure regulating valve 18 is repaired, the safety valve 17 cannot be opened arbitrarily like the safety valve 17 in the prior art, but must be opened automatically when the pressure in the downstream pipeline drops to a level exceeding P2, which greatly improves the safety of the downstream pipeline.

[0053] It is understandable that the first valve body, the second valve body, the first valve port 11 and the second valve port 12 can be independently arranged, or part or all of them can be arranged in the same valve body 13. When the four are independently arranged or partly independently arranged, the communication relationship between them can be achieved through an external pipeline. Preferably, the four are arranged in the same valve body 13. It is worth noting that, referring to Figure 1 By arranging the first valve body, the second valve body, the first valve port 11 and the second valve port 12 in the same valve body main body 13, the integrity of the first valve body, the second valve body, the first valve port 11 and the second valve port 12 can be ensured, and the risk of separation of the four can be reduced. The connection relationship between the four can be achieved through an external pipeline or an internal pipeline. Preferably, reference Figure 1, the communication relationship between the four is realized through the built-in pipeline, that is, the first connecting body 9 and the second connecting body 10 are also arranged in the valve body 13. It is easy to understand that by arranging the first connecting body 9 and the second connecting body 10 in the valve body 13, that is, the pipeline connecting the first hole section 1 and the fourth hole section 6 and the pipeline connecting the second hole section 2 and the third hole section 5 are both arranged in the valve body 13, compared with arranging the pipeline outside the valve body 13, the built-in pipeline can save the pipeline disassembly and assembly process, and the built-in pipeline can greatly reduce the risk of pipeline leakage.

[0054] refer to Figure 1 In one embodiment, the second valve port 12 is provided at one end of the third hole section 5 away from the fourth hole section 6, and a hollow first pressing block 14 is provided in the third hole section 5, and the first pressing block 14 abuts against one end of the second elastic member 8 away from the second valve core 7. By providing the second valve port 12 at one end of the third hole section 5, that is, opening one end of the third hole section 5 as the second valve port 12, the process of separately opening the second valve port 12 is saved. The first pressing block 14 is designed as a hollow structure, so that the communication between the third hole section 5 and the second valve port 12 is not blocked.

[0055] refer to Figure 1 In one embodiment, the third hole section 5 is a stepped hole structure, the first pressing block 14 is a stepped shaft structure adapted to the third hole section 5, and the shaft shoulder of the first pressing block 14 abuts against the hole shoulder of the third hole section 5. By setting the third hole section 5 as a stepped hole structure and the first pressing block 14 as a stepped shaft structure, the first pressing block 14 forms a limited fit with the third hole section 5. When the shaft shoulder of the first pressing block 14 abuts against the hole shoulder of the third hole section 5, the first pressing block 14 cannot continue to go deeper along the third hole section 5. At this time, it means that the first pressing block 14 has reached the expected position, which improves the installation efficiency of the first pressing block 14. Preferably, the first pressing block 14 does not need to be provided with an external thread. The first pressing block 14 is fixed by the sealing tube connected to the second valve port 12. That is to say, when the second valve port 12 is connected to the sealing tube in the return line, the end of the sealing tube will push the first pressing block 14. In other embodiments, the outer wall of the first pressing block 14 is provided with a thread, and the first pressing block 14 is screwed to the third hole section 5.

[0056] refer to Figure 1In one embodiment, an adjusting screw 15 is threadedly connected inside the first hole section 1, and the adjusting screw 15 abuts against one end of the first elastic member 4 away from the first valve core 3. The adjusting screw 15 is used to adjust the elastic force of the first elastic member 4. It is worth noting that by setting the adjusting screw 15, the elastic force provided by the first elastic member 4 to the first valve core 3 can be adjusted, thereby realizing the adjustment of the pressure difference P2 in the pressure difference communication device 19, that is, the specific value of the pressure difference P2 in the pressure difference communication device 19 can be set by the adjusting screw 15, thereby improving the adaptability of the pressure difference communication device 19. Preferably, a locking screw 16 is threadedly connected inside the first hole section 1, and the locking screw 16 abuts against one end of the adjusting screw 15 away from the first elastic member 4. By setting the locking screw 16, the adjusting screw 15 can be limited, thereby reducing the risk of loosening of the adjusting screw 15.

[0057] refer to Figure 1 It can be understood that the directions of the first stepped hole, the second stepped hole, the first valve port 11 and the second valve port 12 can be the same or different, and there are multiple options for the directions of the four. Preferably, the central axis of the first stepped hole, the central axis of the second stepped hole, the central axis of the first valve port 11 and the central axis of the second valve port 12 are parallel to each other. By making the central axis of the first stepped hole, the central axis of the second stepped hole, the central axis of the first valve port 11 and the central axis of the second valve port 12 parallel to each other, the size of the valve body 13 in the direction perpendicular to the central axis of the first stepped hole can be greatly reduced.

[0058] It is understandable that, in one embodiment, the first valve port 11 and the second valve port 12 are both adapted to a sealing tube with a thread model of R1 / 4. The sealing tube with a thread model of R1 / 4 is more commonly used, which can improve the versatility of the first valve port 11 and the second valve port 12.

[0059] It can be understood that the first elastic member 4 and the second elastic member 8 can be elastic members such as a spiral spring, a linear spring (helical spring) or a spring sheet, preferably a linear spring.

[0060] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A pressure difference communication device, characterized in that: include: a first valve body, wherein the first valve body is provided with a first stepped hole, the first stepped hole comprises a first hole section and a second hole section, and the diameter of the first hole section is larger than that of the second hole section; a first valve core, the first valve core being slidably mounted in the first hole section, and the first valve core being able to block or open the communication between the first hole section and the second hole section by sliding in the first hole section; A first elastic member, the first elastic member is disposed in the first hole section and pushes against an end of the first valve core away from the second hole section; a second valve body, wherein the second valve body is provided with a second stepped hole, the second stepped hole comprises a third hole section and a fourth hole section, and the diameter of the third hole section is larger than that of the fourth hole section; a second valve core, the second valve core being slidably mounted in the third hole section, and the communication between the third hole section and the fourth hole section can be blocked or opened by sliding the second valve core in the third hole section; a second elastic member, the second elastic member being disposed in the third hole section and abutting against an end of the second valve core away from the fourth hole section; The first hole segment and the fourth hole segment are interconnected to form a first interconnected body, and the second hole segment and the third hole segment are interconnected to form a second interconnected body; a first valve port, the first valve port being connected to the first connecting body; The second valve port is connected to the second connecting body.

2. A pressure difference communication device according to claim 1, characterized in that: The first valve body, the second valve body, the first valve port and the second valve port are all arranged on the same valve body.

3. A pressure difference communication device according to claim 2, characterized in that: The first communicating body and the second communicating body are both arranged on the valve body.

4. A pressure difference communication device according to claim 1, characterized in that: The second valve port is arranged at one end of the third hole section away from the fourth hole section. A hollow first pressing block is arranged in the third hole section. The first pressing block abuts against one end of the second elastic member away from the second valve core.

5. A pressure difference communication device according to claim 4, characterized in that: The third hole section is a stepped hole structure, the first pressing block is a stepped shaft structure adapted to the third hole section, and a shaft shoulder of the first pressing block abuts against a hole shoulder of the third hole section.

6. A pressure difference communication device according to claim 1, characterized in that: An adjusting screw is threadedly connected in the first hole section, the adjusting screw abuts against an end of the first elastic member away from the first valve core, and the adjusting screw is used to adjust the elastic force of the first elastic member.

7. A pressure difference communication device according to claim 6, characterized in that: A locking screw is threadedly connected in the first hole section, and the locking screw abuts against an end of the adjusting screw away from the first elastic member.

8. A pressure difference communication device according to claim 2, characterized in that: A central axis of the first stepped hole, a central axis of the second stepped hole, a central axis of the first valve port, and a central axis of the second valve port are parallel to each other.

9. A pressure difference communication device according to claim 1, characterized in that: The first valve port and the second valve port are both adapted to a sealing tube with a thread model of R1 / 4.

10. A pressure difference communication device according to any one of claims 1 to 9, characterized in that: The first elastic member and the second elastic member are linear springs.

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