A high pressure stop valve block and system

Abstract

The application discloses a high-pressure stop valve block and system, and solves the technical problem of poor operation performance of a large-diameter high-pressure ball valve in the prior art. The high-pressure stop valve block comprises a valve block body, a two-way cartridge valve and a reversing valve, the valve block body is provided with a mounting cavity, a main oil inlet, a main oil return outlet and a main oil outlet; the two-way cartridge valve is mounted in the mounting cavity of the valve block body, the two-way cartridge valve comprises a control cover plate and a valve core, the valve core is movably arranged in the mounting cavity, a cavity wall of an oil passing cavity is further provided with a first oil inlet and a first oil outlet, the first oil inlet is communicated with the main oil inlet, and the first oil outlet is communicated with the main oil outlet; the reversing valve is provided with a first working oil port, a second oil inlet, a first oil return outlet and a second working oil port; the first oil return outlet is communicated with the main oil return outlet; through the combination of the two-way cartridge valve and the manual reversing valve, compared with the large-diameter high-pressure ball valve, the application is convenient to operate, and the normal operation and safety of a hydraulic system are ensured.

Description

Technical Field

[0001] This application belongs to the field of hydraulic system technology, specifically relating to a high-pressure shut-off valve block and system. Background Technology

[0002] In hydraulic systems, the oil circuit shut-off function is crucial, and traditional solutions often rely on high-pressure ball valves to achieve this. Large-diameter high-pressure ball valves consist of a valve body, ball, seat, and stem. Their working principle involves rotating the stem to rotate the ball, aligning or misaligning the through-hole on the ball with the channel on the valve body, thus opening or closing the oil circuit. However, large-diameter high-pressure ball valves perform poorly in large-diameter circuits (e.g., DN100 and above). As the diameter and pressure increase, the operating torque of the ball valve increases significantly, resulting in large opening and closing torques. This not only causes great inconvenience for manual operation but also requires greater driving force even when using electric or pneumatic actuators, increasing cost and system complexity. Furthermore, during the opening or closing process, there is significant friction between the ball and seat in large-diameter high-pressure ball valves, which easily leads to wear on both the ball and seat, thus affecting the valve's sealing performance and service life. Summary of the Invention

[0003] To address the technical problem of poor operational performance of current large-diameter high-pressure ball valves, this application provides a high-pressure shut-off valve block and system.

[0004] In a first aspect of this application, a high-pressure shut-off valve block is provided, comprising:

[0005] The valve block body is provided with an installation cavity, a main oil inlet, a main oil return port, and a main oil outlet. The main oil inlet is used to connect with the oil inlet pipeline; the main oil return port is used to connect with the oil return pipeline; and the main oil outlet is used to connect with the oil outlet pipeline.

[0006] A two-way cartridge valve is installed in the mounting cavity of the valve block body. The two-way cartridge valve includes a control cover plate and a valve core. The valve core is movably disposed in the mounting cavity to divide the mounting cavity into a spring cavity for accommodating a spring and an oil passage cavity. The wall of the oil passage cavity is also provided with a first oil inlet and a first oil outlet. The first oil inlet is connected to the main oil inlet, and the first oil outlet is connected to the main oil outlet.

[0007] A reversing valve is installed on the valve block body and is provided with a second oil inlet, a first oil return port, a first working oil port and a second working oil port; the first oil return port is connected to the main oil return port;

[0008] Specifically, when the reversing valve is in the first working position, the first working port and the first return port are connected, so that the hydraulic oil in the spring cavity flows into the main return port through the first working port and the first return port, and the valve core of the two-way cartridge valve leaves the first outlet port and opens; when the reversing valve is in the second working position, the second inlet port and the first working port are connected, so that the hydraulic oil flows into the spring cavity through the second inlet port and the first working port, and the valve core of the two-way cartridge valve blocks the first outlet port and closes.

[0009] In some embodiments, the valve block further includes a bypass ball valve installed on the valve block body, the bypass ball valve being connected in parallel with the two-way cartridge valve, and the bypass ball valve being connected to both the main oil inlet and the main oil outlet.

[0010] In some embodiments, the two-way cartridge valve further includes a first damping hole disposed on the control cover plate, the first damping hole communicating with the spring cavity of the two-way cartridge valve.

[0011] In some embodiments, the channel connecting the main oil inlet and the first oil inlet is provided with a first pressure measuring point; the channel connecting the main oil outlet and the first oil outlet is provided with a second pressure measuring point.

[0012] In some embodiments, the reversing valve further includes a second working port, which has a blocking channel and a second damping orifice.

[0013] In some embodiments, the channel connecting the first working oil port and the first damper is provided with a third pressure measuring point; the sealing channel is provided with a fourth pressure measuring point.

[0014] In some embodiments, the directional valve is a manual directional valve or a solenoid directional valve.

[0015] In some embodiments, the reversing valve has a bore diameter of DN6 or DN10;

[0016] And / or, the directional valve is a two-position four-way directional valve.

[0017] In a second aspect of this application, a high-pressure shut-off system is provided, including the aforementioned high-pressure shut-off valve block.

[0018] In some embodiments, the high-voltage cutoff system further includes:

[0019] The oil inlet pipeline is connected to the main oil inlet of the high-pressure shut-off valve block;

[0020] The oil outlet pipeline is connected to the main oil outlet of the high-pressure shut-off valve block;

[0021] The return oil line is connected to the main return oil port of the high-pressure shut-off valve block;

[0022] A return oil check valve is installed on the return oil pipeline.

[0023] A high-pressure shut-off valve block and system are provided according to one or more embodiments of this application. The high-pressure shut-off valve block includes a valve block body, a two-way cartridge valve, and a reversing valve. The valve block body has an installation cavity, a main oil inlet, a main oil return port, and a main oil outlet. The main oil inlet is connected to an oil inlet pipeline; the main oil return port is connected to a return oil pipeline; and the main oil outlet is connected to an oil outlet pipeline. The two-way cartridge valve is installed in the installation cavity of the valve block body. The two-way cartridge valve includes a control cover plate and a valve core. The valve core is movably disposed within the installation cavity to divide the installation cavity into a spring cavity for accommodating a spring and an oil passage cavity. The wall of the oil passage cavity is further provided with a first oil inlet and a first oil outlet. The first oil inlet is connected to the main oil inlet, and the first oil outlet is connected to the main oil outlet. The directional valve is installed on the valve block body and has a first working port, a second inlet port, a first return port, and a second working port. The first return port is connected to the main return port. When the directional valve is in the first working position, the first working port is connected to the first return port, so that the hydraulic oil in the spring chamber flows into the main return port through the first working port and the first return port, and the valve core of the two-way cartridge valve leaves the first outlet port and opens. When the directional valve is in the second working position, the second inlet port is connected to the first working port, so that the hydraulic oil flows into the spring chamber through the second inlet port and the first working port, and the valve core of the two-way cartridge valve blocks the first outlet port and closes.

[0024] Therefore, this application utilizes a combination of a two-way cartridge valve and a directional valve. Compared to large-diameter high-pressure ball valves, the directional valve is easier to operate. By switching the working position of the directional valve, the opening and closing of the two-way cartridge valve spool is controlled, thereby achieving fluid flow control. The directional valve spool has a positioning function, eliminating the need for constant manual operation and improving operational convenience. Furthermore, compared to the problem of easily deformable sealing surfaces in traditional large-diameter high-pressure ball valves, the combination of the two-way cartridge valve and the directional valve improves sealing performance, reduces the risk of internal leakage, and ensures the normal operation and safety of the hydraulic system. Attached Figure Description

[0025] Figure 1 A schematic diagram of the high-pressure shut-off valve block is shown in one or more embodiments of this application.

[0026] Figure 2 It shows Figure 1 A schematic diagram of the structure of a two-way cartridge valve.

[0027] Figure 3 It shows Figure 1 A schematic diagram of the reversing valve.

[0028] Explanation of reference numerals in the attached diagram: 100-High-pressure shut-off valve block, 111-Main oil inlet, 112-Main oil return port, 113-Main oil outlet, 120-Two-way cartridge valve, 121-Control cover plate, 122-Valve core, 123-Spring cavity, 124-First oil inlet, 125-First oil outlet, 126-First damping orifice, 130-Reversing valve, 131-First working oil port, 132-Second oil inlet, 133-First oil return port, 134-Second working oil port, 140-Bypass ball valve, 150-Blocking passage, 151-Second damping orifice, 160-Return oil check valve. Detailed Implementation

[0029] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] Please see Figure 1 , Figure 2 and Figure 3According to a first aspect of this application, a high-pressure shut-off valve block 100 includes a valve block body, a two-way cartridge valve 120, and a reversing valve 130. The valve block body is provided with an installation cavity, a main oil inlet 111, a main oil return port 112, and a main oil outlet 113. The main oil inlet 111 is used to communicate with an oil inlet pipeline; the main oil return port 112 is used to communicate with a return oil pipeline; and the main oil outlet 113 is used to communicate with an oil outlet pipeline. The two-way cartridge valve 120 is installed in the installation cavity of the valve block body. The two-way cartridge valve 120 includes a control cover plate 121 and a valve core 122. The valve core 122 is movably disposed in the installation cavity to divide the installation cavity into a spring cavity 123 for accommodating a spring and an oil passage cavity. The wall of the oil passage cavity is also provided with a first oil inlet 124 and a first oil outlet 125. The first oil inlet 124 is connected to the main oil inlet 111, and the first oil outlet 125 is connected to the main oil outlet 113. The directional valve 130 is installed on the valve block body and has a first working port 131, a second inlet port 132, a first return port 133, and a second working port 134. The first return port 133 is connected to the main return port 112. When the directional valve 130 is in the first working position, the first working port 131 and the first return port 133 are connected, so that the hydraulic oil in the spring cavity 123 flows into the main return port 112 through the first working port 131 and the first return port 133, and the valve core 122 of the two-way cartridge valve 120 leaves the first outlet port 125 and opens. When the directional valve 130 is in the second working position, the second inlet port 132 and the first working port 131 are connected, so that the hydraulic oil flows into the spring cavity 123 through the second inlet port 132 and the first working port 131, and the valve core 122 of the two-way cartridge valve 120 blocks the first outlet port 125 and closes.

[0031] The first inlet 124 of the two-way cartridge valve 120 is port B of the two-way cartridge valve 120, and the first outlet 125 of the two-way cartridge valve 120 is port A of the two-way cartridge valve 120. The first working port 131 of the directional control valve 130 is port A of the directional control valve 130, the second inlet 132 of the directional control valve 130 is port P of the directional control valve 130, and the first return port 133 of the directional control valve 130 is port T of the directional control valve 130. The first working position of the directional control valve 130 is the left working position, and the second working position of the directional control valve 130 is the right working position.

[0032] When the high-pressure shut-off valve block 100 needs to be opened, the directional valve 130 is switched to the first working position, i.e., the directional valve 130 is in the left working position. At this time, the first working port 131 and the first return port 133 of the directional valve 130 are connected, i.e., the A port of the directional valve 130 is connected to the T port of the directional valve 130. The hydraulic oil in the spring chamber 123 of the two-way cartridge valve 120 is discharged to the main return port 112 through the A port and the T port of the manual directional valve 130. The inlet line flows to the B port of the two-way cartridge valve 120 through the channel. The hydraulic oil overcomes the spring force of the two-way cartridge valve 120 and opens the valve core 122. The hydraulic oil flows to the outlet line Pa through the A port of the two-way cartridge valve 120. That is, the opening of the two-way cartridge valve 120 can be controlled by switching the working position of the directional valve 130.

[0033] When the high-pressure shut-off valve block 100 needs to be closed, the directional valve 130 is switched to the second working position, i.e., the directional valve 130 is in the right working position. At this time, the second oil inlet 132 of the directional valve 130 is connected to the first working oil port 131 of the directional valve 130, i.e., the P port of the directional valve 130 is connected to the A port of the directional valve 130. The hydraulic oil flows through the oil inlet line Pe, one path to the P port of the directional valve 130, and through the A port of the directional valve 130 to the spring chamber 123 of the two-way cartridge valve 120; the other path flows to the B port of the two-way cartridge valve 120. Under the combined action of the spring force of the two-way cartridge valve 120 and the hydraulic oil in its upper chamber, the valve core 122 is closed, and the hydraulic oil cannot flow through the A port of the two-way cartridge valve 120 to the outlet line Pa. That is, the closing of the two-way cartridge valve 120 can be controlled by switching the working position of the directional valve 130.

[0034] Therefore, this application combines a two-way cartridge valve and a directional valve. Compared to large-diameter high-pressure ball valves, the directional valve is easier to operate. By switching the working position of the directional valve, the opening and closing of the two-way cartridge valve core is controlled, thereby achieving fluid flow on / off. The directional valve core has a positioning function, eliminating the need for constant manual operation and improving operational convenience. It avoids the problem of easy deformation of the sealing surface in traditional large-diameter high-pressure ball valves, thus improving sealing performance, reducing the risk of internal leakage, and ensuring the normal operation and safety of the hydraulic system.

[0035] In some embodiments, the valve block further includes a bypass ball valve 140 mounted on the valve block body. The bypass ball valve 140 is connected in parallel with the two-way cartridge valve 120, and the bypass ball valve 140 is connected to both the main oil inlet 111 and the main oil outlet 113. Before opening the high-pressure shut-off valve block 100, the bypass ball valve 140 can be opened first, allowing the hydraulic oil in the inlet line Pe to flow to the outlet line Pa through the bypass ball valve 140, so that the pressure in the inlet line Pe and the outlet line Pa are equal. This can reduce the pressure shock generated when the directional valve 130 is operated to the first working position, i.e., the left working position, and the two-way cartridge valve 120 is opened.

[0036] In some embodiments, the two-way cartridge valve 120 further includes a control cover plate 121 and a first damping hole 126 disposed on the control cover plate 121, the first damping hole 126 communicating with the spring cavity 123 of the two-way cartridge valve 120. The first damping hole 126 in the control cover plate 121 effectively reduces pressure shocks and pressure oscillations during the opening or closing process of the two-way cartridge valve 120, thereby improving system stability.

[0037] In some embodiments, a first pressure measuring point is provided in the channel connecting the main oil inlet 111 and the first oil inlet 124; a second pressure measuring point is provided in the channel connecting the main oil outlet 113 and the first oil outlet 125. The first pressure measuring point M1 is used to detect the pressure of the oil inlet line Pe, which can determine whether hydraulic oil is entering the main oil inlet 111; the second pressure measuring point M2 is used to detect the pressure of the oil outlet line Pa, which can determine whether hydraulic oil is exiting the main oil outlet 113. During the operation of the valve block, if a fault occurs, the pressure difference between the first and second pressure measuring points can be used to help determine whether a fault has occurred in the main oil inlet 111 and the main oil outlet 113.

[0038] In some embodiments, the directional control valve 130 further includes a second working port, which has a blocking passage 150 and a second damping orifice 151. This can be used to reduce pressure oscillations when the directional control valve 130 switches to the left working position. During the switching process of the directional control valve 130, when fluid passes through the second damping orifice 151, it limits the speed at which hydraulic oil flows into and out of the blocking passage 150, thereby reducing pressure shocks during the switching process of the directional control valve 130.

[0039] In some embodiments, the diameter of the second damping orifice 151 is smaller than the diameter of the reversing valve 130. The diameter of the second damping orifice 151 is 0.3mm to 2mm, and can be 0.3mm, 0.5mm, 0.8mm, 1.2mm, 1.5mm or 2mm.

[0040] In some embodiments, the channel connecting the first working port and the first damper is provided with a third pressure measuring point; the blocking channel 150 is provided with a fourth pressure measuring point. The third pressure measuring point M3 is used to detect the pressure at port A of the first working port of the reversing valve 130, i.e., the pressure at port A of the reversing valve 130, which can determine whether the spring chamber 123 of the two-way cartridge valve 120 is connected to the first working port; the fourth pressure measuring point M4 is used to detect the pressure at the second working port of the reversing valve 130, i.e., the pressure at port B of the reversing valve 130, i.e., to determine whether the P port and the B port of the reversing valve 130 are connected. During the operation of the valve block, if a fault occurs, the pressure at the third and fourth pressure measuring points can be used to help determine whether the reversing valve 130 has malfunctioned.

[0041] In some embodiments, the directional valve 130 is a manual directional valve 130. The manual directional valve 130 can control the opening and closing of the valve core 122 by manually switching the working position of the directional valve, thereby realizing the flow of fluid. The valve core of the directional valve 130 has a positioning function, which does not require continuous manual operation and improves the convenience of operation.

[0042] In other embodiments, the directional valve 130 is an electromagnetic directional valve 130, which realizes electric function through electrical signal control, further improving automation performance, meeting the needs of different hydraulic systems, improving work efficiency and ease of operation, reducing manual intervention costs and error rates, and has significant application advantages in hydraulic systems with high automation requirements. It can better adapt to the needs of the system and promote the development and progress of hydraulic system technology.

[0043] In some embodiments, the orifice of the reversing valve is DN6 or DN10; the valve orifice of the small-diameter reversing valve 130 is smaller, and the inertia of the oil flow inside is smaller. Therefore, the reversing valve can switch quickly during the process of switching the working position of the reversing valve, thereby realizing the rapid reversing of the reversing valve 130.

[0044] In some embodiments, the directional valve 130 is a two-position four-way directional valve 130, used to control the on / off state and direction switching of hydraulic oil.

[0045] A second aspect of this application provides a high-pressure shut-off system, including the high-pressure shut-off valve block 100 described above. The specific structure of the high-pressure shut-off valve block 100 is as described in the above embodiments. Since the high-pressure shut-off system employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0046] In some embodiments, the high-pressure shut-off system further includes: an oil inlet pipeline connected to the main oil inlet 111 of the high-pressure shut-off valve block 100; an oil outlet pipeline connected to the main oil outlet 113 of the high-pressure shut-off valve block 100; a return oil pipeline connected to the main return oil outlet 112 of the high-pressure shut-off valve block 100; and a return oil check valve 160 disposed on the return oil pipeline.

[0047] Therefore, when the high-pressure shut-off valve block 100 needs to be opened, the directional valve 130 needs to be switched to the first working position, that is, the directional valve 130 is in the left working position. At this time, the first working port 131 and the first return port 133 of the directional valve 130 are connected, that is, the A port of the directional valve 130 is connected to the T port of the directional valve 130. The second inlet port 132 and the second working port 134 of the directional valve 130 are connected, that is, the P port of the directional valve 130 is connected to the B port of the directional valve 130. The hydraulic oil flows through the inlet pipeline Pe... One path flows to port P of directional valve 130, and through port B of directional valve 130 to the blocking channel 150; the hydraulic oil in the spring chamber 123 of the two-way cartridge valve 120 flows through the first damping hole 126 of the control cover plate 121 to port A of directional valve 130, and through port T of directional valve 130 and return check valve 160 to the return line; another path flows to port B of two-way cartridge valve 120, the hydraulic oil overcomes the spring force of two-way cartridge valve 120, opens valve core 122, and the hydraulic oil flows through port A of two-way cartridge valve 120 to the outlet line Pa.

[0048] When the high-pressure shut-off valve block 100 needs to be closed, the directional valve 130 is switched to the second working position, i.e., the directional valve 130 is in the right working position. At this time, the second oil inlet 132 of the directional valve 130 is connected to the first working oil port 131 of the directional valve 130, i.e., the P port of the directional valve 130 is connected to the A port of the directional valve 130. The second working oil port 134 of the directional valve 130 is connected to the first return oil port 133, i.e., the B port of the directional valve 130 is connected to the T port of the directional valve 130; hydraulic oil The oil flows through the inlet line Pe to the P port of the directional valve 130, then through the A port of the directional valve 130 to the control cover plate 121, and through the first damping hole 126 of the control cover plate 121 into the spring chamber 123 of the two-way cartridge valve 120; another part flows to the B port of the two-way cartridge valve 120. Under the combined action of the spring force of the two-way cartridge valve 120 and the hydraulic oil in its upper chamber, the valve core 122 is closed, and the hydraulic oil cannot flow through the A port of the two-way cartridge valve 120 to the outlet line Pa.

[0049] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction 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.

[0052] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0053] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-pressure shut-off valve block, characterized in that, include: The valve block body is provided with an installation cavity, a main oil inlet, a main oil return port, and a main oil outlet. The main oil inlet is used to connect with the oil inlet pipeline; the main oil return port is used to connect with the oil return pipeline; and the main oil outlet is used to connect with the oil outlet pipeline. A two-way cartridge valve is installed in the mounting cavity of the valve block body. The two-way cartridge valve includes a control cover plate and a valve core. The valve core is movably disposed in the mounting cavity to divide the mounting cavity into a spring cavity for accommodating a spring and an oil passage cavity. The wall of the oil passage cavity is also provided with a first oil inlet and a first oil outlet. The first oil inlet is connected to the main oil inlet, and the first oil outlet is connected to the main oil outlet. A reversing valve is installed on the valve block body and is provided with a second oil inlet, a first oil return port, a first working oil port and a second working oil port; the first oil return port is connected to the main oil return port; Specifically, when the reversing valve is in the first working position, the first working port and the first return port are connected, so that the hydraulic oil in the spring cavity flows into the main return port through the first working port and the first return port, and the valve core of the two-way cartridge valve leaves the first outlet port and opens; when the reversing valve is in the second working position, the second inlet port and the first working port are connected, so that the hydraulic oil flows into the spring cavity through the second inlet port and the first working port, and the valve core of the two-way cartridge valve blocks the first outlet port and closes.

2. The high-pressure shut-off valve block according to claim 1, characterized in that, The valve block also includes a bypass ball valve installed on the valve block body. The bypass ball valve is connected in parallel with the two-way cartridge valve, and the bypass ball valve is connected to both the main oil inlet and the main oil outlet.

3. The high-pressure shut-off valve block according to claim 1, characterized in that, The two-way cartridge valve further includes a first damping hole disposed on the control cover plate, the first damping hole being connected to the spring cavity of the two-way cartridge valve.

4. The high-pressure shut-off valve block according to claim 1, characterized in that, The channel connecting the main oil inlet and the first oil inlet is provided with a first pressure measuring point; the channel connecting the main oil outlet and the first oil outlet is provided with a second pressure measuring point.

5. The high-pressure shut-off valve block according to claim 3, characterized in that, The second working oil port is provided with a sealing channel, and the sealing channel is also provided with a second damping orifice.

6. The high-pressure shut-off valve block according to claim 5, characterized in that, The channel connecting the first working oil port and the first damper is provided with a third pressure measuring point; the sealing channel is provided with a fourth pressure measuring point.

7. The high-pressure shut-off valve block according to any one of claims 1-6, characterized in that, The reversing valve is either a manual reversing valve or a solenoid reversing valve.

8. The high-pressure shut-off valve block according to claim 7, characterized in that, The reversing valve has a bore diameter of DN6 or DN10; And / or, the directional valve is a two-position four-way directional valve.

9. A high-voltage cutoff system, characterized in that, Includes the high-pressure shut-off valve block as described in any one of claims 1-8.

10. The high-voltage cutoff system according to claim 9, characterized in that, The high-voltage cutoff system also includes: The oil inlet pipeline is connected to the main oil inlet of the high-pressure shut-off valve block; The oil outlet pipeline is connected to the main oil outlet of the high-pressure shut-off valve block; The return oil line is connected to the main return oil port of the high-pressure shut-off valve block; A return oil check valve is installed on the return oil pipeline.

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