Control valve group with pressure maintaining and leak detecting functions

Abstract

The application discloses a control valve group with pressure maintaining and leak detection functions, which comprises a flow pipe, a controller, a main valve core, a flat pressure shell, a pressure gauge and a leak detection and pressure regulating assembly. The main valve core is arranged at the middle position of the flow pipe, and the flow pipe flow channel is divided into an inlet section and an outlet section by the main valve core. The controller is arranged outside the flow pipe, a valve rod is arranged between the controller and the main valve core, the flat pressure shell is arranged outside the flow pipe, the flat pressure shell wraps the controller and the part connected with the flow pipe, the medium flowing through the control valve group is initially injected into the flat pressure shell, the pressure in the flat pressure shell is between the inlet flow pressure and the atmospheric pressure, the control line of the controller passes through the flat pressure shell and is connected to the outside of the control valve group, and the pressure gauge is arranged on the side wall of the flat pressure shell. The flat pressure shell also extends to the side wall of the inlet section, the leak detection and pressure regulating assembly is arranged on the side wall of the flow pipe and is connected with the medium in the inlet section and the flat pressure shell respectively, and the leak detection and pressure regulating assembly releases the medium in the flat pressure shell when the pressure in the inlet section is reduced.

Description

Technical Field

[0001] This invention relates to the field of pipeline control valve technology, specifically a control valve assembly with pressure holding and leak detection functions. Background Technology

[0002] The semiconductor industry requires many special gases. During the transportation of these process media, it is necessary to maintain significant pressure stability and prevent leakage. Several valves control the on-off state of the pipeline. The dynamic seals of these valve operating rods are prone to leakage. In addition, there are also some pipe connection failures in long-distance pipelines, which can also cause pressure loss in the pipeline system.

[0003] In existing technologies, the selection criteria for the dynamic seal at the valve controller are generally improved, and short-term maintenance is used to ensure the good condition of the flow control valve. If the controller is directly subjected to the high pressure of the flowing medium, while the internal pressure of the controller is the normal pressure at which it was sealed, the dynamic seal may be damaged, and the medium may enter the controller and cause damage. If the controller is raised to a position slightly away from the valve body, the valve stem dynamic seal is directly exposed to the atmosphere, and the dynamic seal at the point where the controller enters the interior may not bear the pressure difference. However, in this case, the valve stem dynamic seal bears a significant difference between the medium pressure and the atmospheric pressure. If the valve stem dynamic seal fails, the medium in the valve body will leak directly at the valve stem, causing danger. Therefore, there is currently no control valve structure that can fully suppress leakage for special process media. Summary of the Invention

[0004] The purpose of this invention is to provide a control valve assembly with pressure holding and leak detection functions to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A control valve assembly with pressure holding and leak detection functions includes a flow pipe, a controller, a main valve core, a pressure equalization shell, and a pressure gauge. The main valve core is located in the middle of the flow pipe, dividing the flow pipe channel into an inlet section and an outlet section. The controller is located outside the flow pipe, and a valve stem is located between the controller and the main valve core. The pressure equalization shell is located outside the flow pipe, enclosing the controller and the part where the controller connects to the flow pipe. The medium flowing through the control valve assembly is initially injected into the pressure equalization shell, and the pressure inside the pressure equalization shell is between the inlet pressure of the inlet section and atmospheric pressure. The control line of the controller passes through the pressure equalization shell and connects to the outside of the control valve assembly. A pressure gauge is installed on the side wall of the pressure equalization shell.

[0007] The process medium entering from the inlet section is controlled by the main valve core. The lifting and lowering control of the main valve core is achieved through a dynamic seal between the valve stem and the side wall of the flow pipe. A stationary flat pressure shell is used to cover the dynamic seal position where the valve stem extends, and pressure is injected into the shell so that the pressure difference on both sides of the dynamic seal is only the difference between the pressure of the medium in the flow pipe and the pressure inside the flat pressure shell, thus increasing the life of the dynamic seal. A pressure gauge monitors the pressure change inside the flat pressure shell. When the dynamic seal of the valve stem at the main valve core fails, the medium in the flow pipe will leak into the flat pressure shell, causing a pressure change. If the pressure gauge detects an increase in pressure, it indicates that the dynamic seal has failed.

[0008] The pressure inside the pressure chamber is half the gauge pressure of the inlet section. That is, the pressure inside the pressure chamber is half the pressure of the inlet section. The dynamic seal at the valve stem only bears half the medium pressure, and there is also a dynamic seal at the internal connection of the controller's operating rod, which also only bears half the medium pressure. This keeps both dynamic seals in a low state to prevent damage.

[0009] The control valve assembly also includes a leak detection and pressure regulating component, and the pressure equalization housing extends to the side wall of the inlet section.

[0010] The leak detection and pressure regulating assembly is installed on the side wall of the flow pipe. The leak detection and pressure regulating assembly is connected to the medium in the inlet section and inside the pressure shell.

[0011] When the leak detection and pressure regulating component detects a decrease in pressure in the inlet section, it releases the medium inside the pressure equalization shell.

[0012] When the main valve core is closed, the control valve assembly is in a pressure-holding detection state. At this time, the upstream and downstream pressures should remain constant. If a leak occurs in the inlet pipe connected to the inlet section, the medium pressure in the inlet section will decrease slightly. The leak detection and pressure regulating component will activate under this condition, allowing the medium in the pressure equalization housing to be released and stored through a specific path into the leak detection and pressure regulating component. The pressure in the pressure equalization housing will decrease significantly, and the pressure gauge will detect the pressure change to alert the user that a leak has occurred in the upstream pipeline. The leak detection and pressure regulating component allows the degree of medium release in the pressure equalization housing to be designed as needed, unaffected by the decrease in pressure in the inlet section. This achieves a step amplification of the pressure signal after an upstream leak.

[0013] The leak detection and pressure regulating assembly includes a hydraulic condition valve and a hydraulic force distribution valve.

[0014] The hydraulic conditional valve includes a conditional cavity created by the wall thickness of the flow tube, a conditional slider slidably disposed within the conditional cavity, a first pressure-inlet hole communicating with the pressure shell at the end of the conditional cavity facing the pressure shell, a second pressure-inlet hole communicating with the pressure shell at the side wall of the conditional cavity, a third pressure-inlet hole communicating with the inlet section at the end of the conditional cavity facing the inlet section, a low-pressure head at one end of the conditional slider facing the pressure shell, a throttling head at the middle of the conditional slider, and a high-pressure head at the end of the conditional slider facing the inlet section. The end area of ​​the low-pressure head is larger than the end area of ​​the high-pressure head.

[0015] When the condition slider is positioned close to the flat pressure shell, the throttling head blocks the second pressure tap.

[0016] When the condition slider is on the side closer to the inlet section, the throttling head moves away from the second pressure tap.

[0017] The hydraulic force distribution valve includes a pressure regulating chamber created by the wall thickness of the flow pipe. A pressure regulating block, T-shaped, is slidably disposed within the pressure regulating chamber, with its larger end facing the flat pressure shell. The chamber on one side of the larger end of the pressure regulating block within the pressure regulating chamber is the pressure application chamber. A drainage channel is provided between the pressure application chamber and the condition chamber. The drainage channel and the second pressure inlet are located at the same axial position on the side wall of the condition chamber.

[0018] A reset structure is installed in the pressure regulating chamber. When the control valve group is in the open position, the reset structure makes the pressure regulating block in the pressure regulating chamber at the extreme position near the flat pressure shell. When the control valve group is closed, the reset structure releases the pressure regulating block so that it can slide under pressure on both sides in the pressure regulating chamber.

[0019] The area of ​​the low-pressure head is smaller than the area of ​​the large-head end of the voltage regulator.

[0020] The hydraulic condition valve is used to identify the pressure drop in the inlet section and control the connection between the second pressure tap and the drainage channel. The ratio of the low-pressure head end area to the high-pressure head end area is designed according to the pressure ratio in the inlet section and the pressure in the flat pressure shell. In the initial state, the condition slider is on the side closer to the flat pressure shell, and the second pressure tap is blocked. When the pressure in the inlet section drops, because the low-pressure head end area is small, the condition slider will displace more towards the inlet section. Then the blocking of the second pressure tap is removed, and the medium in the flat pressure shell can enter the pressure chamber through the second pressure tap and the drainage channel. The small end area of ​​the pressure regulating block is small, and the pressure it receives is small. Therefore, the pressure regulating block can slide axially with a large amplitude, allowing the pressure in the flat pressure shell to be released quickly until the pressure after the pressure drop is multiplied by the pressure value obtained by the large end area of ​​the pressure regulating block equals the pressure value at the small end, or the condition slider moves up again after the pressure in the flat pressure shell drops, completely blocking the second pressure tap.

[0021] A check valve is installed on the path of the third pressure tap. The flow path of the check valve is from the condition chamber to the inlet section. A fourth pressure tap is also installed at the end of the condition chamber facing the inlet section, which connects to the inlet section. A shut-off structure is installed on the path of the fourth pressure tap. The shut-off structure is in the open state when the control valve group is in the conducting state, and in the closed state when the control valve group is in the closed state.

[0022] When the leak detection and pressure regulating component is activated, the check valve structure ensures that the medium in the chamber connected to it can only be discharged to the inlet section in one direction by the pressure of the condition slider, preventing reverse connection. That is, the condition slider can fall to a position close to the inlet section after the pressure in the inlet section decreases and maintain this position. During the process of the medium in the pressure shell being discharged into the hydraulic pressure distribution valve, it will not move back to the pressure shell due to the continuous decrease in pressure received by the low pressure head. It will only keep the second pressure inlet hole connected to the drainage channel. It will only reset when the pressure is injected into the high pressure head end again by the next time the shut-off structure is activated. It should be noted that the shut-off structure should only be activated after the reset structure makes the pressure regulating block at the extreme position of the pressure regulating chamber close to the pressure shell, so that all the medium in the pressure shell received by the hydraulic pressure distribution valve can return to the pressure shell. The shut-off structure can be an electromagnetic switch.

[0023] A fifth pressure inlet hole is provided on one side of the small end of the pressure regulating block in the pressure regulating chamber. The fifth pressure inlet hole is connected to the inlet section. The ratio of the end area of ​​the large end to the small end of the pressure regulating block is greater than the ratio of the end area of ​​the low pressure end to the end area of ​​the high pressure end.

[0024] The pressure received at the small end of the pressure regulating block is the inlet section pressure, which allows the final pressure value in the pressure chamber to be linked to the inlet section. Furthermore, the ratio of the end area of ​​the large end to the small end of the pressure regulating block is greater than the ratio of the low-pressure end area to the high-pressure end area. For example, if the ratio of the large end to the small end area of ​​the pressure regulating block is three, and the ratio of the low-pressure end area to the high-pressure end area is two, then initially, the pressure inside the pressure chamber is half that of the inlet section. When the inlet section pressure decreases slightly, due to the small absolute value of the low-pressure end area, the conditional slider experiences significant axial sliding, opening the second pressure inlet hole. Afterward, the medium inside the pressure chamber continuously leaks into the pressure chamber. The target pressure reduction value is one-third of the current inlet section pressure. Because the ratio of the end area of ​​the large end to the small end of the pressure regulating block is three, the pressure reduction value inside the pressure chamber is based on one-sixth of the basic inlet section pressure, not a slight reduction caused by leakage.

[0025] The reset structure is a reset coil, which is embedded in the side wall of the fifth pressure hole. The small end of the voltage regulator block has a magnetic pole structure. When the reset coil is energized, the electromagnetic poles repel the magnetic poles on the small end of the voltage regulator block.

[0026] When the reset coil is energized, it repels the voltage regulating block, causing it to return to its extreme position near the flat pressure shell.

[0027] When control valve assemblies are used in combination, the outlet sections of the two control valve assemblies are connected back to back, so that the inlet section of one control valve assembly is used as the inlet and the inlet section of the other control valve assembly is used as the outlet.

[0028] The two control valve groups connected back to back can be controlled by two main valve cores to ensure on / off performance. When used together, they can simultaneously monitor whether there is a slight leakage in the upstream and downstream. The upstream fluctuation is as mentioned above. If a leakage occurs in the downstream, the pressure gauge connected to the flat pressure shell on the outlet side will also show a fluctuation of a few tenths of the original downstream pressure.

[0029] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: By setting a flat pressure shell outside the dynamic sealing position of the main valve core and the valve stem that controls its lifting and lowering, and injecting a pressurized medium into the shell, the dynamic seal between the operating parts and internal components at the controller also bears the pressure difference. Due to the presence of the pressure inside the flat pressure shell, the pressure difference borne by the two dynamic seals is halved, thus improving the service life of the dynamic seal.

[0030] When the dynamic seal is intact, the pressure inside the pressure shell is stable. After the dynamic seal fails, the pressure inside the pressure shell increases. The dynamic seal status is identified by detecting the pressure inside the pressure shell.

[0031] When the control valve group is in the off state, the flat pressure shell, together with the leak detection and pressure adjustment component, detects the pressure change on the inlet section. The slight pressure change in the inlet section changes the condition valve connection state, opens the discharge path from the flat pressure shell to the hydraulic power distribution valve, and achieves a new and greater pressure difference balance with the pressure in the inlet section in the hydraulic power distribution valve. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 yes Figure 1 View A in the middle;

[0035] Figure 3 yes Figure 2 View B in the middle;

[0036] Figure 4 yes Figure 2 View C in the middle;

[0037] Figure 5 This is a connection diagram when the present invention is used in series;

[0038] In the diagram: 1. Flow pipe; 11. Inlet section; 12. Outlet section; 21. Controller; 22. Main valve core; 3. Pressure equalization shell; 4. Pressure gauge; 5. Leak detection and pressure adjustment assembly; 51. Hydraulic condition valve; 511. Condition chamber; 5111. First pressure tap; 5112. Second pressure tap; 5113. Third pressure tap; 5114. Fourth pressure tap; 512. Condition slider; 5121. Low pressure head; 5122. Throttling head; 5123. High pressure head; 513. Check valve; 514. Cut-off structure; 52. Hydraulic force distribution valve; 521. Pressure adjustment chamber; 5211. Pressure application chamber; 5212. Fifth pressure tap; 522. Pressure adjusting block; 523. Reset coil; 53. Drainage channel. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] A control valve assembly with pressure holding and leak detection function includes a flow pipe 1, a controller 21, a main valve core 22, a pressure equalizing shell 3, and a pressure gauge 4. The main valve core 22 is located in the middle of the flow pipe 1, dividing the flow channel of the flow pipe 1 into an inlet section 11 and an outlet section 12. The controller 21 is located outside the flow pipe 1, and a valve stem is provided between the controller 21 and the main valve core 22. The pressure equalizing shell 3 is located outside the flow pipe 1, and it encloses the controller 21 and the part where the controller 21 is connected to the flow pipe 1. The medium flowing through the control valve assembly is initially injected into the pressure equalizing shell 3, and the pressure inside the pressure equalizing shell 3 is between the inlet pressure of the inlet section 11 and atmospheric pressure. The control line of the controller 21 passes through the pressure equalizing shell 3 and connects to the outside of the control valve assembly. A pressure gauge 4 is provided on the side wall of the pressure equalizing shell 3.

[0041] like Figure 1 As shown, the process medium entering from the inlet section is controlled by the main valve core 22. The valve stem of the main valve core 22 and the side wall of the flow pipe 1 form a dynamic seal. A stationary flat pressure shell 3 is used to cover the dynamic seal position where the valve stem extends, and pressure is injected into the shell so that the pressure difference on both sides of the dynamic seal is only the difference between the pressure of the medium in the flow pipe 1 and the pressure inside the flat pressure shell 3, thereby increasing the life of the dynamic seal. The pressure gauge 4 monitors the pressure change inside the flat pressure shell 3. When the dynamic seal of the valve stem at the main valve core 22 fails, the medium in the flow pipe 1 will leak into the flat pressure shell 3, causing a pressure change. If the pressure gauge detects an increase in pressure, it indicates that the dynamic seal has failed.

[0042] The internal pressure of the pressure shell 3 is half of the gauge pressure of the inlet section 11. That is, the internal pressure P2 of the pressure shell 3 is half of the pressure P1 of the inlet section 11. The dynamic seal at the valve stem only bears half of the medium pressure, and there is also a dynamic seal at the internal connection of the operating rod of the controller 21, which also only bears half of the medium pressure. This keeps both dynamic seals in a low state to prevent damage.

[0043] The control valve assembly also includes a leak detection and pressure regulating component 5, and the pressure equalization housing 3 extends to the side wall of the inlet section 11.

[0044] Leak detection and pressure regulating assembly 5 is installed on the side wall of the flow pipe 1. Leak detection and pressure regulating assembly 5 is connected to the medium in the inlet section 11 and the pressure shell 3.

[0045] When the pressure inside the inlet section 11 decreases, the leak detection and pressure regulating component 5 releases the medium inside the pressure-releasing shell 3.

[0046] like Figure 1 , 2 As shown, when the main valve core 22 is closed, the control valve assembly is in a pressure-holding detection state. At this time, the upstream and downstream pressures should remain constant. If a leak occurs in the inlet pipe connected to the inlet section 11, the medium pressure in the inlet section 11 will decrease slightly. The leak detection and pressure regulating component 5 will operate under this condition, allowing the medium in the pressure equalization shell 3 to be released and stored in the leak detection and pressure regulating component 5 through a specific path. The pressure in the pressure equalization shell 3 will decrease significantly, and the pressure gauge 4 will detect the pressure change and remind the user that there is a leak in the upstream pipeline. The leak detection and pressure regulating component 5 allows the degree of medium release in the pressure equalization shell 3 to be designed as needed, unaffected by the decrease in pressure in the inlet section 11. This achieves a step amplification of the pressure signal after an upstream leak.

[0047] Leak detection and pressure regulating assembly 5 includes a hydraulic condition valve 51 and a hydraulic force distribution valve 52.

[0048] The hydraulic condition valve 51 includes a condition cavity 511 created with the wall thickness of the flow pipe 1. A condition slider 512 is slidably disposed within the condition cavity 511. A first pressure-inlet hole 5111 communicating with the flat pressure shell 3 is provided at the end of the condition cavity 511 facing the flat pressure shell 3. A second pressure-inlet hole 5112 communicating with the flat pressure shell 3 is provided on the side wall of the condition cavity 511. A third pressure-inlet hole 5113 communicating with the inlet section 11 is provided at the end of the condition cavity 511 facing the inlet section 11. A low-pressure head 5121 is provided at one end of the condition slider 512 facing the flat pressure shell 3. A throttling head 5122 is provided at the middle position of the condition slider 512. A high-pressure head 5123 is provided at the end of the condition slider 512 facing the inlet section 11. The end area of ​​the low-pressure head 5121 is larger than the end area of ​​the high-pressure head 5123.

[0049] When the condition slider 512 is positioned close to the flat pressure shell 3, the throttling head 5122 blocks the second pressure tap 5112.

[0050] When the condition slider 512 is on the side close to the inlet section 11, the throttle head 5122 moves away from the second pressure tap 5112;

[0051] The hydraulic force distribution valve 52 includes a pressure regulating chamber 521 created with the wall thickness of the flow pipe 1. A pressure regulating block 522 is slidably disposed within the pressure regulating chamber 521. The pressure regulating block 522 is T-shaped, with its larger end facing the flat pressure shell 3. The chamber on one side of the larger end of the pressure regulating block 522 within the pressure regulating chamber 521 is a pressure application chamber 5211. A drainage channel 53 is provided between the pressure application chamber 5211 and the condition chamber 511. The drainage channel 53 and the second pressure inlet 5112 are located at the same axial position on the side wall of the condition chamber 511.

[0052] A reset structure is provided in the pressure regulating chamber 521. When the control valve group is in the passage, the reset structure makes the pressure regulating block 522 in the pressure regulating chamber 521 at one end limit position close to the flat pressure shell 3. When the control valve group is disconnected, the reset structure releases the pressure regulating block 522 so that it can slide under pressure on both sides in the pressure regulating chamber 521.

[0053] The area of ​​the low-pressure head 5121 is smaller than the area of ​​the large-pressure head of the voltage regulating block 522.

[0054] like Figure 2 , 3 As shown, the hydraulic condition valve 51 is used to identify the pressure drop in the inlet section 11 and control the connection between the second pressure tap 5112 and the drainage channel 53. The ratio of the end area D1 of the low-pressure head 5121 to the end area D2 of the high-pressure head 5123 is designed according to the pressure ratio inside the inlet section 11 and the pressure inside the flat pressure shell 3. In the initial state, the condition slider 512 is located closer to the flat pressure shell 3, at which time the second pressure tap 5112 is blocked. When the pressure inside the inlet section 11 drops, because the end area of ​​the low-pressure head 5121 is small, the displacement of the condition slider 512 towards the inlet section 11 will be larger. After that, the second pressure tap 512... The obstruction of the second pressure inlet 5112 is removed, and the medium inside the flat pressure shell 3 can enter the pressure chamber 5211 through the second pressure inlet 5112 and the drainage channel 53. The small end area D4 of the pressure regulating block 522 is small, and the pressure it receives is small. Therefore, the pressure regulating block 522 can slide axially to a large extent, so that the pressure inside the flat pressure shell 3 can be released quickly until the pressure value obtained by multiplying the pressure after the pressure reduction by the large end area D3 of the pressure regulating block 522 equals the pressure value at the small end, or the condition slider 512 moves up again to completely block the second pressure inlet 5112 after the pressure inside the flat pressure shell 3 has been reduced.

[0055] A check structure 513 is provided on the path of the third pressure port 5113. The flow path of the check structure 513 is from the condition chamber 511 to the inlet section 11. A fourth pressure port 5114 is also provided at the end of the condition chamber 511 facing the inlet section 11, which connects to the inlet section 11. A shut-off structure 514 is provided on the path of the fourth pressure port 5114. The shut-off structure 514 is also in the open state when the control valve group is in the conducting state, and the shut-off structure 514 is also in the closed state when the control valve group is in the closed state.

[0056] like Figure 2 , 4 As shown, when the leak detection and pressure regulating component 5 is activated, the check valve 513 ensures that the medium in the chamber connected to the condition chamber 511 can only be discharged to the inlet section 11 in one direction by the pressure of the condition slider 512, preventing reverse connection. That is, the condition slider 512 can remain in this position after the pressure in the inlet section 11 decreases and it falls to a position close to the inlet section 11. During the process of the medium in the flat pressure shell 3 being discharged into the hydraulic pressure distribution valve 52, it will not move back to the flat pressure shell 3 due to the continuous decrease in pressure received by the low pressure head 5121. The second pressure inlet 5112 will remain connected to the flow channel 53 until the next time the cut-off structure 514 is open. The inlet section 11 will then inject pressure into the end of the high pressure head 5123 to reset. It should be noted that the cut-off structure 514 should only be opened after the reset structure makes the pressure regulating block 522 in the pressure regulating chamber 521 at the extreme position close to the flat pressure shell 3, so that all the medium received in the flat pressure shell 3 in the hydraulic force distribution valve 52 can return to the flat pressure shell 3. The cut-off structure 514 can be an electromagnetic switch.

[0057] A fifth pressure inlet hole 5212 is provided on one side of the small end of the pressure regulating block 522 in the pressure regulating chamber 521. The fifth pressure inlet hole 5212 is connected to the inlet section 11. The ratio of the end area of ​​the large end to the small end of the pressure regulating block 522 is greater than the ratio of the end area of ​​the low pressure head 5121 to the end area of ​​the high pressure head 5123.

[0058] like Figure 2As shown, the pressure received at the small end of the pressure regulating block 522 is the pressure of the inlet section 11, which allows the final pressure value in the pressure chamber 5211 to be linked to the inlet section 11. Furthermore, the ratio of the end area of ​​the large end to the small end of the pressure regulating block 522 is greater than the ratio of the end area of ​​the low-pressure head 5121 to the end area of ​​the high-pressure head 5123. For example, if the ratio of the end area of ​​the large end to the small end of the pressure regulating block 522 is three, and the ratio of the end area of ​​the low-pressure head 5121 to the end area of ​​the high-pressure head 5123 is two, then it can be known that initially, the pressure inside the flat pressure shell 3 is half that of the inlet section 11. When the pressure in the inlet section 11 decreases slightly, due to the small pressure of the low-pressure head 5121, the pressure will increase. With a small absolute value, for example, the ratio of D1 / D2 / D3 / D4 can be designed as 1:0.5:9:3. The small-diameter condition slider produces a large displacement under less pressure change, and the condition slider 512 produces a large axial sliding, opening the second pressure inlet 5112. After that, the medium in the flat pressure shell 3 continues to be released into the pressure chamber 5211. The target value of the pressure reduction is one-third of the current pressure of the inlet section 11. Because the ratio of the end area of ​​the large end to the small end of the pressure regulating block 522 is three, the pressure reduction value in the flat pressure shell 3 is based on one-sixth of the pressure of the basic inlet section 11, and is not a slight reduction caused by leakage.

[0059] The reset structure is a reset coil 523, which is embedded in the side wall of the fifth pressure hole 5212. The small end of the voltage regulating block 522 has a magnetic pole structure. The electromagnetic pole of the reset coil 523 after being energized repels the magnetic pole on the small end of the voltage regulating block 522.

[0060] like Figure 2 As shown, after the reset coil 523 is energized, it repels the voltage regulating block 522, causing it to return to the extreme position near the end of the flat pressure shell 3.

[0061] When control valve assemblies are used in combination, the outlet sections of the two control valve assemblies are connected back to back, so that the inlet section of one control valve assembly is used as the inlet and the inlet section of the other control valve assembly is used as the outlet.

[0062] like Figure 5 As shown, the two control valve groups connected back to back can be controlled by two main valve cores to ensure on / off performance. When used together, they can simultaneously monitor whether there is a slight leakage in the upstream and downstream. The upstream fluctuation is as described above. If a leakage occurs in the downstream, the pressure gauge 4 connected to the flat pressure shell 3 on the outlet side will also show a fluctuation of a few tenths of the original downstream pressure.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 process, method, article, or apparatus.

[0064] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control valve assembly with pressure holding and leak detection function, characterized in that: The control valve group includes a flow pipe (1), a controller (21), a main valve core (22), a pressure plate (3), and a pressure gauge (4). The main valve core (22) is located in the middle of the flow pipe (1). The main valve core (22) divides the flow channel of the flow pipe (1) into an inlet section (11) and an outlet section (12). The controller (21) is located outside the flow pipe (1). A valve stem is located between the controller (21) and the main valve core (22). The pressure plate (3) is located outside the flow pipe (1). The pressure plate (3) encloses the controller (21) and the part where the controller (21) is connected to the flow pipe (1). The medium flowing through the control valve group is initially injected into the pressure plate (3). The pressure inside the pressure plate (3) is between the inlet pressure of the inlet section (11) and atmospheric pressure. The control line of the controller (21) passes through the pressure plate (3) and connects to the outside of the control valve group. A pressure gauge (4) is located on the side wall of the pressure plate (3). The control valve assembly also includes a leak detection and pressure regulating component (5), and the pressure equalization housing (3) extends to the side wall of the inlet section (11). The leak detection and pressure regulating assembly (5) is installed on the side wall of the flow pipe (1). The leak detection and pressure regulating assembly (5) is connected to the medium in the inlet section (11) and the pressure shell (3). The leak detection and pressure regulating component (5) detects when the pressure inside the inlet section (11) decreases and releases the medium inside the pressure plate (3).

2. A control valve assembly with pressure holding and leak detection function according to claim 1, characterized in that: The internal pressure of the flat pressure shell (3) is half of the gauge pressure of the inlet section (11).

3. A control valve assembly with pressure-holding and leak-detection function according to claim 1, characterized in that: The leak detection and pressure regulating assembly (5) includes a hydraulic condition valve (51) and a hydraulic force distribution valve (52). The hydraulic condition valve (51) includes a condition cavity (511) created with the wall thickness of the flow pipe (1). A condition slider (512) is slidably disposed in the condition cavity (511). A first pressure-inlet hole (5111) communicating with the flat pressure shell (3) is provided at the end of the condition cavity (511) facing the flat pressure shell (3). A second pressure-inlet hole (5112) communicating with the flat pressure shell (3) is provided on the side wall of the condition cavity (511). A third pressure-inlet hole (5113) communicating with the inlet section (11) is provided at the end of the condition cavity (511) facing the inlet section (11). A low-pressure head (5121) is provided at one end of the condition slider (512) facing the flat pressure shell (3). A throttling head (5122) is provided at the middle position of the condition slider (512). A high-pressure head (5123) is provided at the end of the condition slider (512) facing the inlet section (11). The end area of ​​the low-pressure head (5121) is larger than the end area of ​​the high-pressure head (5123). When the condition slider (512) is on the side close to the flat pressure shell (3), the throttle head (5122) blocks the second pressure tap (5112). When the condition slider (512) is on the side close to the inlet section (11), the throttle head (5122) moves away from the second pressure tap (5112); The hydraulic force distribution valve (52) includes a pressure regulating chamber (521) created with the wall thickness of the flow pipe (1). A pressure regulating block (522) is slidably arranged in the pressure regulating chamber (521). The pressure regulating block (522) is T-shaped, with its large end facing the flat pressure shell (3). The chamber on one side of the large end of the pressure regulating block (522) in the pressure regulating chamber (521) is a pressure application chamber (5211). A drainage channel (53) is provided between the pressure application chamber (5211) and the condition chamber (511). The drainage channel (53) and the second pressure inlet (5112) are at the same axial position on the side wall of the condition chamber (511). A reset structure is provided in the pressure regulating chamber (521). When the control valve group is in the passage, the reset structure makes the pressure regulating block (522) in the pressure regulating chamber (521) at one end of the limit position close to the flat pressure shell (3). When the control valve group is disconnected, the reset structure releases the pressure regulating block (522) so that it can slide under pressure on both sides in the pressure regulating chamber (521). The low-pressure head (5121) has a smaller end area than the large end area of ​​the pressure regulating block (522).

4. A control valve assembly with pressure holding and leak detection function according to claim 3, characterized in that: A check structure (513) is provided on the path of the third pressure hole (5113). The flow path of the check structure (513) is from the condition chamber (511) to the inlet section (11). A fourth pressure hole (5114) is also provided at the end of the condition chamber (511) facing the inlet section (11) to connect to the inlet section (11). A stop structure (514) is provided on the path of the fourth pressure hole (5114). The stop structure (514) is also in the open state when the control valve group is in the conducting state, and the stop structure (514) is also in the closed state when the control valve group is in the closed state.

5. A control valve assembly with pressure-holding and leak-detection function according to claim 4, characterized in that: The pressure regulating block (522) in the pressure regulating chamber (521) has a fifth pressure inlet hole (5212) on one side of the small end. The fifth pressure inlet hole (5212) is connected to the inlet section (11). The ratio of the end area of ​​the large end to the small end of the pressure regulating block (522) is greater than the ratio of the end area of ​​the low pressure head (5121) to the end area of ​​the high pressure head (5123).

6. A control valve assembly with pressure-holding and leak-detection function according to claim 5, characterized in that: The reset structure is a reset coil (523), which is embedded in the side wall of the fifth pressure hole (5212). The small end of the voltage regulating block (522) has a magnetic pole structure. The electromagnetic pole of the reset coil (523) after being energized repels the magnetic pole on the small end of the voltage regulating block (522).

7. A control valve assembly with pressure holding and leak detection function according to claim 1, characterized in that: The control valve groups are used in combination. When used in combination, the outlet sections of the two control valve groups are connected back to back, so that the inlet section of one control valve group is used as the inlet and the inlet section of the other control valve group is used as the outlet.

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