A superimposed stop valve

Abstract

The application provides a superimposed stop valve, which comprises a valve body, a manual pilot valve, main valve cores and shuttle valves, the valve body has A2 oil paths, B2 oil paths and T2 oil paths, the main valve cores are arranged on both sides of the valve body, end covers are connected to both sides of the valve body, the manual pilot valve and the shuttle valve are arranged on each end cover, the manual pilot valve is connected with the T2 oil paths through T oil paths, the manual pilot valve is connected with a control oil path pressure oil path and a main valve core control cavity, the control oil path pressure oil path is connected with the shuttle valve, the main valve core control cavity is connected with the main valve core, the main valve cores on both sides are connected with the A2 oil paths and the B2 oil paths, a transition plate is connected to the upper part of the valve body, the transition plate has first oil paths and second oil paths, the valve body has third oil paths and fourth oil paths, the first oil paths and the third oil paths are connected to form A1 oil paths, the second oil paths and the fourth oil paths are connected to form B1 oil paths, and the two shuttle valves are connected with the third oil paths and the fourth oil paths through A oil paths. The application is simple in operation, labor-saving and capable of saving operation space.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and more particularly to a superimposed shut-off valve. Background Technology

[0002] In hydraulic control circuits, a shut-off valve is typically installed in the oil line between the control valve and the actuator to control the on / off state of the oil line. This shut-off valve is usually a pipe-type ball valve in the pipeline or a plate-type ball valve on the valve plate. Installing it in the pipeline not only requires sufficient space for opening and closing the ball valve but also increases the amount of pipeline welding work, affecting equipment manufacturing efficiency; installing it on the valve plate requires increasing the size of the valve plate and the complexity of its design.

[0003] Currently, some maintenance valves also have models with similar functions, but the sealing methods typically use throttling gate valves and ball valves. Throttling gate valves require rotating the valve stem to displace the valve core axially, thus opening and closing the valve, making operation relatively cumbersome. Ball valves, on the other hand, require rotating a handle to control the valve core's opening and closing; while simpler to operate, rotating the handle requires reserved operating space. Furthermore, the interface dimensions of current maintenance valves differ from the common interface dimensions of stacked valves, necessitating valve redesign and reducing the valve plate's versatility. Summary of the Invention

[0004] To address the aforementioned technical problems, a stacked shut-off valve is provided.

[0005] The technical means employed in this invention are as follows:

[0006] A stacked shut-off valve includes: a valve body, a manual pilot valve, a main valve core, and a shuttle valve. The valve body has an internal oil passage A2, an oil passage B2, and an oil passage T2. Two main valve cores are provided and are respectively installed on both sides of the inside of the valve body.

[0007] The valve body is connected to end caps on both sides of its exterior. Each end cap is equipped with a manual pilot valve and a shuttle valve. The manual pilot valve and shuttle valve on each side are arranged at vertical intervals.

[0008] The manual pilot valve is connected to the T2 oil circuit via the T oil circuit; the manual pilot valve is connected to the control oil circuit pressure oil circuit and the main valve core control chamber; the control oil circuit pressure oil circuit is connected to the shuttle valve; the main valve core control chamber is connected to the main valve core; and the main valve cores on both sides are connected to the A2 oil circuit and the B2 oil circuit respectively.

[0009] The upper part of the valve body is connected to a transition plate, and the T2 oil circuit passes through the transition plate. The transition plate has a first oil circuit and a second oil circuit inside, and the valve body has a third oil circuit and a fourth oil circuit inside. The first oil circuit and the third oil circuit are connected to form the A1 oil circuit, and the second oil circuit and the fourth oil circuit are connected to form the B1 oil circuit. The two shuttle valves are respectively connected to the third oil circuit and the fourth oil circuit through the A oil circuit.

[0010] Furthermore, the superimposed shut-off valve adopts a pilot-operated structure, and the outer end of the manual pilot valve is connected to a handwheel. The opening and closing of the main valve core is controlled by manually pushing, pulling and rotating the manual pilot valve through the handwheel, thereby realizing the opening and closing of the shut-off valve.

[0011] Furthermore, when it is necessary to open the left shut-off valve, manually rotate the handwheel to release the manual pilot valve from the locked state. At this time, the valve core of the manual pilot valve moves to the right to the open position under the action of the spring. The pressure oil from the shuttle valve is shut off, and the pressure from the B oil circuit pushes the main valve core to open. The main valve core control oil is discharged to the T circuit through the manual pilot valve. Finally, the right shut-off valve is in the same state as the left shut-off valve.

[0012] When it is necessary to close the right shut-off valve, manually rotate the handwheel and push the valve core of the manual pilot valve to the left, and rotate the handwheel to lock the valve core position of the manual pilot valve. At this time, the pressure oil from the shuttle valve reaches the control oil chamber of the main valve core through the manual pilot valve, the main valve core moves to the left, and the shut-off valve closes.

[0013] Further, the manual pilot valve includes a first nut, a first valve body, a pin, a sealing ring and a retaining ring, a valve core, a screw plug, a first sealing ring, a second sealing ring, a spring, and a second nut. The valve core is located inside the first valve body, and a sealing ring and a retaining ring are provided between the valve core and the left inner wall of the first valve body. The right side of the first valve body is provided with oil port I, oil port II, and oil port III. The right outer wall of the first valve body is provided with a screw plug, a first sealing ring, and a second sealing ring. The screw plug is close to oil port III. Both the first sealing ring and the second sealing ring are sealed to the valve body. The first sealing ring is located between oil port II and oil port III, and the second sealing ring is located between oil port I and oil port II. Oil port I is connected to the control oil circuit pressure oil circuit, oil port II is connected to the main valve core control chamber, and oil port III is connected to the T oil circuit.

[0014] The left side of the valve core is connected to the handwheel. A spring is installed inside the left side of the first valve body. The spring is sleeved on the outside of the valve core. A second nut is connected to the valve core. The second nut is located to the left of the spring and is in contact with the spring. A first nut is connected to the left end of the handwheel through the valve core. The valve core can move left and right inside the first valve body through the handwheel.

[0015] The left side of the first valve body and the handwheel have two coaxial pin holes, and pins are installed in the two pin holes.

[0016] Furthermore, when the handwheel is pushed to move the valve core to the right, the oil passage between port II and port III is closed, while the oil passage between port I and port II is connected; when the handwheel is rotated, the valve core is locked in this position; at this time, the high-pressure oil from the shuttle valve flows into the main valve core control chamber through the manual pilot valve, and the main valve core is closed.

[0017] When the handwheel is pulled to move the valve core to the left, the oil passage between port I and port II is closed, while the oil passage between port II and port III is connected; when the handwheel is rotated, the valve core is locked in this position; at this time, the oil from the main valve core control chamber is discharged to the T oil passage through the manual pilot valve and finally returns to the oil tank, and the main valve core opens.

[0018] Furthermore, the oil circuit of the manual pilot valve is sealed with a line seal to ensure zero leakage in the control oil circuit, thereby ensuring zero leakage in the entire stacked shut-off valve.

[0019] Furthermore, the main valve core adopts a cone valve sealing structure to achieve bidirectional shut-off and zero leakage; the main valve core and the valve sleeve form a line seal.

[0020] Furthermore, the transition plate is connected to the valve body by screws, and pressure test connectors are installed on both sides of the transition plate, which are respectively connected to the first oil circuit and the second oil circuit.

[0021] Furthermore, the connection dimensions of the transition plate are the same as those of the bottom plate of the valve body, that is, the interface connection dimensions conform to the ISO4401 standard, and the interface connection dimensions are consistent with those of DN06, DN10, and DN16 stacked control valves, so they can be directly stacked and installed without redesigning the valve plate.

[0022] Furthermore, the end cap is bolted to the valve body.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. Operability: The present invention adopts a pilot-operated structure, and the opening and closing of the main valve core can be controlled by manually pushing, pulling and rotating the manual pilot valve. It is simple to operate, labor-saving and saves operating space.

[0025] 2. Functionality: This invention employs a cone valve sealing structure, enabling bidirectional shut-off and achieving zero leakage. A pressure testing connector facilitates fault diagnosis, and it also features online maintenance capabilities.

[0026] 3. In terms of versatility: The interface connection dimensions are consistent with those of ISO4401 (DN06, DN10, DN16) stackable control valves, allowing for direct stacking and installation without the need for valve plate redesign. This is particularly beneficial for equipment upgrades and modifications.

[0027] 4. Economic benefits: As an alternative to pipeline gate valves and plate gate valves, it saves pipeline welding work and valve plate weight, shortens equipment manufacturing cycle, and reduces manufacturing costs.

[0028] 5. The oil circuit of the manual pilot valve uses a line seal. This ensures zero leakage in the control oil circuit, thereby guaranteeing zero leakage for the entire stacked valve.

[0029] Based on the above reasons, this invention can be widely applied in fields such as hydraulics. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the first type of valve of the present invention.

[0032] Figure 2 This is an exploded view of the main components of the first type of valve of the present invention.

[0033] Figure 3 This is a cross-sectional view of the first type of valve according to the present invention.

[0034] Figure 4 This is a schematic diagram of the switching position of the first type of valve of the present invention.

[0035] Figure 5 This is a perspective view of the first type of valve of the present invention, with the left valve core in the closed state and the right valve core in the open state.

[0036] Figure 6 This is a cross-sectional view of the manual pilot valve of the present invention.

[0037] Figure 7 This is an exploded view of the manual pilot valve of the present invention.

[0038] Figure 8 The diagram shows the valve of the first type of the present invention before and after implementation, where (a) is before implementation and (b) is after implementation.

[0039] Figure 9 This is a schematic diagram of the second type of valve of the present invention.

[0040] Figure 10 This is an exploded view of the main components of the second type of valve of the present invention.

[0041] Figure 11This is a cross-sectional view of the second type of valve according to the present invention.

[0042] Figure 12 This is a perspective view of a second type of valve according to the present invention, with the left valve core in a closed state and the right valve core in an open state.

[0043] Figure 13 The diagram shows the second type of valve of the present invention before and after implementation, where (a) is before implementation and (b) is after implementation.

[0044] Figure 14 This is a schematic diagram of the third type of valve of the present invention.

[0045] Figure 15 This is an exploded view of the main components of the third type of valve of the present invention.

[0046] Figure 16 This is a cross-sectional view of the third type of valve according to the present invention.

[0047] Figure 17 This is a perspective view of a third type of valve according to the present invention, with the left valve core in a closed state and the right valve core in an open state.

[0048] Figure 18 The diagram shows the valve before and after implementation of the third type of valve of the present invention, where (a) is before implementation and (b) is after implementation.

[0049] In the diagram: 1. Manual pilot valve; 2. Main valve core; 3. Shuttle valve; 4. Screw; 5. Pressure test connector; 6. Transition plate; 7. Valve body; 8. Plug; 9. End cap; 10. Handwheel; 11. A oil circuit; 12. Control oil circuit pressure oil circuit; 13. Main valve core control chamber; 14. T oil circuit; 15. Plug;

[0050] 1.1 First manual pilot valve; 1.2 Second manual pilot valve; 2.1 First main valve core; 2.2 Second main valve core; 3.1 First shuttle valve; 4.1 Second shuttle valve;

[0051] 101. First nut; 102. First valve body; 103. Pin; 104. Sealing ring and retaining ring; 105. Valve core; 106. Plug; 107. First sealing ring; 108. Second sealing ring; 109. Spring; 110. Second nut. Detailed Implementation

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0056] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0058] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0059] This invention provides a simple, reliable, and versatile stacked shut-off valve. It relates to control valves for hydraulic equipment and is a shut-off valve designed for use with stacked hydraulic control valves.

[0060] The schematic diagram of the superimposed shut-off valve of this invention is as follows: Figure 1 As shown, the opening and closing of the main valve core 2 is controlled by the manual pilot valve 1. It mainly consists of a valve body 7, main valve core 2, manual pilot valve 1, shuttle valve 3, transition plate 6, and pressure testing connector 5, etc. Figure 2As shown. The valve body 7 has internal oil passages A2, B2, and T2; there are two main valve cores 2 (a first main valve core 2.1 on the left and a second main valve core 2.2 on the right), which are installed on the two sides inside the valve body 7 respectively; end caps 9 are bolted to both sides of the valve body 7, and each end cap 9 is equipped with a manual pilot valve 1 (the two manual pilot valves 1 are the first manual pilot valve 1.1 on the left and the second manual pilot valve 1.2 on the right) and a shuttle valve 3, with the manual pilot valve 1 and shuttle valve 3 on each side arranged vertically; the manual pilot valve 1 is connected to the T2 oil passage through the T oil passage 14; the manual pilot valve 1 is connected to the control oil passage pressure oil passage 12. The main valve core control chamber 13 is connected to the main valve core 2, and the main valve cores 2 on both sides are connected to the A2 oil circuit and the B2 oil circuit, respectively. A transition plate 6 is connected to the upper part of the valve body 7, and the T2 oil circuit passes through the transition plate 6. The transition plate 6 has a first oil circuit and a second oil circuit inside, and the valve body 7 has a third oil circuit and a fourth oil circuit inside. The first and third oil circuits are connected to form the A1 oil circuit, and the second and fourth oil circuits are connected to form the B1 oil circuit. The two shuttle valves 3 (the first shuttle valve 3.1 on the left and the second shuttle valve 4.1 on the right) are connected to the third and fourth oil circuits respectively through the A oil circuit 11. Pressure test connectors 5 are installed on both sides of the transition plate 6, and the pressure test connectors 5 on both sides are connected to the first and second oil circuits, respectively.

[0061] like Figure 6-7As shown, the manual pilot valve 1 includes a first nut 101, a first valve body 102, a pin 103, a sealing ring and a retaining ring 104, a valve core 105, a screw plug 106, a first sealing ring 107, a second sealing ring 108, a spring 109, and a second nut 110. The valve core 105 is located inside the first valve body 102, and a sealing ring and a retaining ring 104 are provided between the valve core 105 and the left inner wall of the first valve body 102. The right side of the first valve body 102 is provided with oil ports I, II, and III. The right outer wall of the first valve body 102 is provided with a screw plug 106, a first sealing ring 107, and a second sealing ring 108. The screw plug 106 is close to oil port III. Both the first sealing ring 107 and the second sealing ring 108 are sealed to the valve body 102. The first sealing ring 107 is located between oil ports II and III, and the second sealing ring 108 is located... Between oil port I and oil port II, oil port I is connected to the control oil pressure circuit 12, oil port II is connected to the main valve core control chamber 13, and oil port III is connected to the T oil circuit 14; the left side of the valve core 105 is connected to the handwheel 10, and a spring 109 is installed inside the left side of the first valve body 102. The spring 109 is sleeved on the outside of the valve core 105, and a second nut 110 is connected to the valve core 105. The second nut 110 is located to the left of the spring 109 and is in contact with the spring 109; a first nut 101 is connected to the left end of the handwheel 10 through the valve core 105; the valve core 105 can move left and right inside the first valve body 102 through the handwheel 10; two coaxial pin holes are opened on the left side of the first valve body 102 and the handwheel 10, and pins 103 are installed in the two pin holes to lock the valve core 105. When the handwheel 10 is pushed to move the valve core 105 to the right, the oil passage between port II and port III is closed, while the oil passage between port I and port II is connected. Rotating the handwheel 10 locks the valve core 105 in this position. At this time, the high-pressure oil from the shuttle valve 3 flows into the main valve core control chamber 13 through the manual pilot valve 1, and the main valve core 2 is closed. When the handwheel 10 is pulled to move the valve core 105 to the left, the oil passage between port I and port II is closed, while the oil passage between port II and port III is connected. Rotating the handwheel 10 locks the valve core 105 in this position. At this time, the oil from the main valve core control chamber 13 is discharged to the T oil passage 14 through the manual pilot valve 1, and finally returns to the oil tank, opening the main valve core 2. The sealing between the oil passages of the manual pilot valve 1 adopts a line seal to ensure that the control oil passage achieves zero leakage, thereby ensuring that the entire stacked valve achieves zero leakage.

[0062] Plug 8 is used to seal the process hole.

[0063] A transition plate 6 is installed on the upper part of the valve body 7. The transition plate 6 is connected to the valve body 7 by screws 4. Its connection dimensions are the same as those of the valve body 7 base plate, both consistent with standard DN06, DN10, and DN16 stacked valves, conforming to ISO4401 standards. This allows the valve to be directly stacked under a valve assembly without requiring a redesigned valve plate. Online maintenance is performed when other control valves connected to this valve malfunction. Simultaneously, pressure test connectors 5 are installed on the A and B oil lines to measure the pressure of the corresponding oil lines, which can be used for fault diagnosis and analysis.

[0064] Shut-off valves are installed on oil lines A and B respectively to control the opening and closing of oil lines A and B. These valves mainly consist of a main valve core 2, a manual pilot valve 1, and a shuttle valve 3. They adopt a pilot-operated structure. A handwheel 10 is connected to the outer end of the manual pilot valve 1. The manual pilot valve 1 is manually pushed and pulled by the handwheel 10 to open and close the control oil line, and the main valve core 2 is hydraulically controlled to open and close the shut-off valve. To ensure zero leakage of the main valve core 2, it adopts a cone valve form, forming a line seal with the valve sleeve. Simultaneously, a seal is provided between the main valve core 2 and the valve sleeve to prevent oil leakage when the main valve core 2 is closed. The shuttle valve 3 ensures that the control chamber of the main valve core 2 always receives high-pressure oil from oil line A or B, enabling the main valve core 2 to achieve bidirectional shut-off. Furthermore, since the control oil comes from oil line A or B, the higher the pressure in oil line A or B, the better the main valve core 2 closes, and the more reliable the shut-off function. The manual pilot valve 1 requires manual pushing and pulling to control whether the main valve core 2's control chamber is connected to the pressure oil from the shuttle valve 3 or to the T oil circuit, thus controlling the opening and closing of the main valve core 2. Because it uses pilot control, compared to ball valves which require force to turn the handle and throttling valves which require several rotations to close, this invention is simple and convenient to operate and saves operating space.

[0065] like Figure 3 As shown in the figure, the left shut-off valve of the present invention is in the closed state, and the right valve is in the open state.

[0066] When it is necessary to open the left shut-off valve, manually rotate handwheel 10 to release the manual pilot valve 1 from the locked state. At this time, the valve core of the manual pilot valve 1 moves to the right to the open position under the action of the spring (e.g., Figure 4 As shown), the pressure oil from shuttle valve 3 is shut off, and the pressure from oil circuit B pushes the main valve core 2 to open. The main valve core 2 controls the oil to be discharged to T circuit through manual pilot valve 1, and finally the right shut-off valve is in the same state as the left shut-off valve.

[0067] When it is necessary to close the right-side shut-off valve, manually rotate handwheel 10 and push the valve core of manual pilot valve 1 to the left (e.g., Figure 4As shown), rotate handwheel 10 to lock the valve core position of manual pilot valve 1. At this time, the pressure oil from shuttle valve 3 can reach the control oil chamber of main valve core 2 through manual pilot valve 1. Main valve core 2 moves to the left and shut-off valve closes, as shown by the state of left shut-off valve.

[0068] like Figure 8 The diagram shows the before and after implementation of the present invention. Replacing the ball valve on the original pipeline with the present invention can reduce pipeline welding work, save materials, save operating space, and increase product production speed, while also making operation simpler. Since the present invention uses the same standard interface connection size as the original stacked valve, the original valve plate can be used without the need to redesign the valve plate.

[0069] Using coke oven products as a pilot project, this invention will replace ball valves on pipelines. Combined with a technical upgrade project for the coke oven hydraulic system—replacing hydraulic steel pipes with hydraulic hoses—this will reduce pipeline welding workload, save materials, conserve operating space, and increase product manufacturing speed.

[0070] This invention relates to a stacked gate valve, which is installed on the oil line connected to the actuator, serving as an alternative to pipeline gate valves and plate gate valves. Its interface connection dimensions conform to ISO4401 and are consistent with the connection dimensions of standard stacked hydraulic valves of DN06, DN10, and DN16. The gate valve adopts a pilot-operated cone valve structure. It features high gate reliability, simple and labor-saving operation, and strong versatility.

[0071] Figure 1-8 This invention is the first type of stacked shut-off valve with the same connection dimensions as the DN06 standard stacked hydraulic valve.

[0072] Figure 9-13 This invention relates to a second type of stacked shut-off valve with the same connection dimensions as the DN10 standard stacked hydraulic valve.

[0073] Figure 14-18 The second type of stacked shut-off valve of the present invention has the same connection dimensions as the DN16 standard stacked hydraulic valve, including a manual pilot valve 1, a main valve core 2, a shuttle valve 3, a screw 4, a pressure test connector 5, a transition plate 6, a valve body 7, a plug 8, an end cover 9, a handwheel 10, and a plug 15.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stacked shut-off valve, characterized in that, include: The valve body (7), manual pilot valve (1), main valve core (2) and shuttle valve (3) are provided. The valve body (7) has an internal oil circuit A2, an oil circuit B2 and an oil circuit T2. There are two main valve cores (2), which are installed on both sides of the inside of the valve body (7). The valve body (7) has end caps (9) connected to both sides of its exterior. Each end cap (9) is equipped with a manual pilot valve (1) and a shuttle valve (3). The manual pilot valves (1) and shuttle valves (3) on each side are arranged vertically. The manual pilot valve (1) is connected to the T2 oil circuit through the T oil circuit (14). The manual pilot valve (1) is connected to the control oil circuit pressure oil circuit (12) and the main valve core control chamber (13). The control oil circuit pressure oil circuit (12) is connected to the shuttle valve (3). The main valve core control chamber (13) is connected to the main valve core (2). The main valve cores (2) on both sides are connected to the A2 oil circuit and the B2 oil circuit, respectively. The upper part of the valve body (7) is connected to a transition plate (6), the T2 oil circuit passes through the transition plate (6), the interior of the transition plate (6) has a first oil circuit and a second oil circuit, the interior of the valve body (7) has a third oil circuit and a fourth oil circuit, the first oil circuit and the third oil circuit are connected to form the A1 oil circuit, the second oil circuit and the fourth oil circuit are connected to form the B1 oil circuit, and the two shuttle valves (3) are respectively connected to the third oil circuit and the fourth oil circuit through the A oil circuit (11).

2. The stacked shut-off valve according to claim 1, characterized in that, The superimposed shut-off valve adopts a pilot-operated structure. The outer end of the manual pilot valve (1) is connected to a handwheel (10). The opening and closing of the main valve core (2) is controlled by manually pushing, pulling and rotating the manual pilot valve (1) through the handwheel (10), thereby realizing the opening and closing of the shut-off valve.

3. The superimposed shut-off valve according to claim 2, characterized in that, When the left shut-off valve needs to be opened, manually rotate the handwheel (10) to release the manual pilot valve (1) from the locked state. At this time, the valve core of the manual pilot valve (1) moves to the right to the open position under the action of the spring. The pressure oil from the shuttle valve (3) is shut off, and the pressure from the B oil circuit pushes the main valve core (2) to open. The main valve core (2) controls the oil to be discharged to the T circuit through the manual pilot valve (1). Finally, the right shut-off valve is in the same state as the left shut-off valve. When it is necessary to close the right shut-off valve, manually rotate the handwheel (10) and push the valve core of the manual pilot valve (1) to the left, and rotate the handwheel (10) to lock the valve core position of the manual pilot valve (1). At this time, the pressure oil from the shuttle valve (3) reaches the control oil chamber of the main valve core (2) through the manual pilot valve (1), the main valve core (2) moves to the left, and the shut-off valve closes.

4. The superimposed shut-off valve according to claim 1, 2 or 3, characterized in that, The manual pilot valve (1) includes a first nut (101), a first valve body (102), a pin (103), a sealing ring and a retaining ring (104), a valve core (105), a plug (106), a first sealing ring (107), a second sealing ring (108), a spring (109), and a second nut (110). The valve core (105) is located inside the first valve body (102), and a sealing ring and a retaining ring (104) are provided between the valve core (105) and the left inner wall of the first valve body (102). Ports I, II, and III are provided on the right side of the first valve body (102). A screw plug (106), a first sealing ring (107), and a second sealing ring (108) are provided on the right outer wall of the first valve body (102). The screw plug (106) is close to the oil port III. The first sealing ring (107) and the second sealing ring (108) are both sealed to the valve body (7). The first sealing ring (107) is located between the oil port II and the oil port III. The second sealing ring (108) is located between the oil port I and the oil port II. The oil port I is connected to the control oil circuit pressure oil circuit (12). The oil port II is connected to the main valve core control cavity (13). The oil port III is connected to the T oil circuit (14). The left side of the valve core (105) is connected to the handwheel (10). A spring (109) is installed inside the left side of the first valve body (102). The spring (109) is sleeved on the outside of the valve core (105). A second nut (110) is connected to the valve core (105). The second nut (110) is located to the left of the spring (109) and is in contact with the spring (109). A first nut (101) is connected to the left end of the handwheel (10) through the valve core (105). The valve core (105) can move left and right inside the first valve body (102) through the handwheel (10). The left side of the first valve body (102) and the handwheel (10) have two coaxial pin holes, and pins (103) are installed in the two pin holes.

5. The stacked shut-off valve according to claim 4, characterized in that, When the handwheel (10) is pushed to move the valve core (105) to the right, the oil passage between port II and port III is closed, while the oil passage between port I and port II is connected; when the handwheel (10) is rotated, the valve core (105) is locked in this position; at this time, the high pressure oil from the shuttle valve (3) flows into the main valve core control chamber (13) through the manual pilot valve (1), and the main valve core (2) is closed; When the handwheel (10) is pulled to move the valve core (105) to the left, the oil passage between port I and port II is closed, and the oil passage between port II and port III is connected; when the handwheel (10) is rotated, the valve core (105) is locked in this position; at this time, the oil from the main valve core control chamber (13) is discharged to the T oil passage (14) through the manual pilot valve (1) and finally returns to the oil tank, and the main valve core (2) is opened.

6. The superimposed shut-off valve according to claim 5, characterized in that, The manual pilot valve (1) uses a line seal between the oil circuits to ensure that the control oil circuit achieves zero leakage, thereby ensuring that the entire stacked shut-off valve achieves zero leakage.

7. The stacked shut-off valve according to claim 1, 2 or 3, characterized in that, The main valve core (2) adopts a cone valve sealing structure to achieve bidirectional shut-off and zero leakage; the main valve core (2) and the valve sleeve form a line seal.

8. The stacked shut-off valve according to claim 1, characterized in that, The transition plate (6) is connected to the valve body (7) by screws (4). Pressure test connectors (5) are installed on both sides of the transition plate (6), and the pressure test connectors (5) on both sides are connected to the first oil circuit and the second oil circuit respectively.

9. The stacked shut-off valve according to claim 1 or 8, characterized in that, The connection dimensions of the transition plate (6) are the same as those of the bottom plate of the valve body (7), that is, the interface connection dimensions conform to the ISO4401 standard, and the interface connection dimensions are consistent with those of the DN06, DN10, and DN16 stacked control valves. They can be directly stacked and installed without redesigning the valve plate.

10. The stacked shut-off valve according to claim 1, characterized in that, The end cap (9) is bolted to the valve body (7).

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