Valve block, control cover plate and cartridge valve

Abstract

The invention relates to a valve block, a control cover plate and a cartridge valve. Compared with the prior art, the second pressure buildup oil port of the pressure buildup oil way is used for obtaining hydraulic oil from the second main oil way of the valve block, and the first pressure buildup oil port is used for conveying the obtained hydraulic oil to the first main oil way of the valve block through the pressure buildup oil way; the first pilot oil way is connected with the pressure buildup control valve and drives the pressure buildup control valve to be opened through a hydraulic signal so as to conduct the pressure buildup oil way. Due to connection of the pressure buildup oil circuit, bypass connection of the second main oil circuit and the first main oil circuit is achieved, then oil pressure between the second main oil circuit and the first main oil circuit is balanced, the oil pressure difference between the two sides of the valve element assembly is reduced, the initial potential energy of oil flowing out can be reduced after the valve element is opened, and hydraulic oil can flow gently; and the pressure impact problem of the system at the conduction moment is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and in particular to a valve block, control cover plate, and cartridge valve. Background Technology

[0002] A cartridge valve is an integrated hydraulic control element, mainly composed of a valve block, valve core, valve sleeve, spring, and seals. It controls the flow of hydraulic fluid or pressure and flow by inserting the valve core into the chamber inside the valve block. It features a compact structure, strong flow capacity, fast response speed, and ease of integration design, making it widely used in high-pressure, high-flow hydraulic systems in metallurgy, shipbuilding, and construction machinery. Its working principle is based on the fact that when the force exerted by the control chamber on the valve core area, plus the spring force, exceeds the combined force of the main hydraulic pressure acting on the valve core, the valve closes. When the pressure in the control chamber decreases, allowing the main hydraulic pressure to overcome the control chamber pressure and the spring force, the valve opens, allowing hydraulic fluid to flow in the main hydraulic circuit.

[0003] The control cover plate directly affects the response characteristics of the cartridge valve and is the core control component of the cartridge valve. It is installed on top of the cartridge valve block and regulates the movement of the cartridge valve spool through an integrated pilot control element. However, in related technologies, when the cartridge valve spool moves too fast, it can cause pressure shocks in the hydraulic system, specifically manifested as sudden and violent fluctuations in system pressure, resulting in vibration, noise, and even damage to components.

[0004] Therefore, it is necessary to develop a new type of valve block, control cover plate, and cartridge valve to improve the aforementioned problems existing in the related technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a valve block, a control cover plate, and a cartridge valve that can reduce the moving speed of the cartridge valve during operation and improve the pressure shock problem.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] The present invention provides a control cover plate for a cartridge valve block, comprising:

[0008] The pressure-building oil circuit includes a second pressure-building oil port and a first pressure-building oil port;

[0009] The second pressure-building port is used to obtain hydraulic oil from the second main oil circuit of the valve block;

[0010] The first pressure-building port is used to supply hydraulic oil to the first main oil circuit of the valve block in order to balance the oil pressure in the second main oil circuit and the first main oil circuit;

[0011] A pressure-building control valve is installed in the pressure-building oil circuit and is used to control the on / off state of the pressure-building oil circuit;

[0012] The first pilot oil circuit is connected to the pressure build-up control valve and is used to control the opening of the pressure build-up control valve;

[0013] The control chamber oil circuit includes a control oil port for connecting to the control chamber of the valve core assembly in the valve block.

[0014] Furthermore, the control chamber oil circuit includes an oil supply circuit, which is connected to the control oil port and the second pressure-building oil port respectively, for supplying hydraulic oil to the control chamber; a normally open logic valve is provided on the oil supply circuit.

[0015] Furthermore, the control cover also includes a second pilot oil passage, which is connected to the normally open logic valve and is used to close the normally open logic valve to disconnect the oil supply passage.

[0016] Furthermore, a sequence valve is provided in the second pilot oil line, which is opened after the pressure build-up control valve.

[0017] Furthermore, the control chamber oil circuit also includes a return oil circuit, which is connected to the control chamber through the control oil port, for the hydraulic oil to flow out of the control chamber.

[0018] Furthermore, the control cover plate also includes a second pilot oil circuit; a hydraulic control check valve is provided on the return oil circuit, and the second pilot oil circuit is connected to the hydraulic control check valve to control the return oil circuit to be open in the direction in which the hydraulic oil flows out of the control chamber.

[0019] Furthermore, an adjustable flow valve is provided on the return oil line.

[0020] Furthermore, it includes a pilot port, and the first pilot oil passage and the second pilot oil passage are connected to the pilot port.

[0021] The present invention provides a valve block for a cartridge valve, comprising:

[0022] Second main oil circuit, first main oil circuit and valve chamber;

[0023] The valve chamber is used to install the valve core assembly, which is used to control the connection and disconnection between the second main oil circuit and the first main oil circuit.

[0024] The second bypass oil circuit and the first bypass oil circuit are respectively connected to the second main oil circuit and the first main oil circuit;

[0025] The second bypass oil circuit includes a second bypass oil port for supplying hydraulic oil to the second pressure-building oil port on the control cover plate;

[0026] The first bypass oil circuit includes a first bypass oil port for obtaining the hydraulic oil from the first pressure-building oil port on the control cover plate, so as to balance the oil pressure in the second main oil circuit and the first main oil circuit.

[0027] The present invention provides a cartridge valve, including the control cover plate described above.

[0028] Compared with the prior art, the valve block, control cover plate, and cartridge valve provided by the present invention have the following beneficial effects:

[0029] 1. In the control cover plate of the present invention, the two ends of the pressure-building oil circuit are respectively connected to the second pressure-building oil port and the first pressure-building oil port; the second pressure-building oil port is used to obtain hydraulic oil from the second main oil circuit of the valve block, while the first pressure-building oil port is used to transport the obtained hydraulic oil to the first main oil circuit of the valve block through the pressure-building oil circuit; the pressure-building control valve is set on the pressure-building oil circuit to control the connection and disconnection state of the pressure-building oil circuit; the first pilot oil circuit is connected to the pressure-building control valve and drives the opening action of the pressure-building control valve through the hydraulic signal to conduct the pressure-building oil circuit; the control chamber oil circuit includes a control oil port, which is connected to the control chamber of the valve core assembly inside the valve block to realize the regulation of the valve core action; due to the connection of the pressure-building oil circuit, the second main oil circuit and the first main oil circuit are connected by bypass, thereby balancing the oil pressure between the second main oil circuit and the first main oil circuit, reducing the oil pressure difference on both sides of the valve core assembly, and reducing the initial potential energy of the oil flow when the valve core is opened, so that the hydraulic oil can flow smoothly and improve the pressure shock problem faced by the system at the moment of conduction.

[0030] 2. The control chamber oil circuit also includes an oil supply circuit, which is connected to the control port and the second pressure-building port respectively. It is used to guide the hydraulic oil from the second pressure-building port and deliver it into the control chamber, thereby providing the necessary initial pressure for the control chamber. A normally open logic valve is also installed on the oil supply circuit. The valve is kept open under normal conditions to ensure that the hydraulic oil can smoothly enter the control chamber.

[0031] 3. The control cover also includes a second pilot oil circuit, which is connected to a normally open logic valve and is used to send a closing signal to the normally open logic valve under the control of the pilot hydraulic signal, thereby cutting off the oil supply circuit and stopping the oil supply to the control chamber.

[0032] 4. A sequence valve is installed on the second pilot oil circuit. The opening pressure of the sequence valve is set, and the opening timing is designed to be later than the opening of the pressure build-up control valve to ensure the timing and coordination of the oil circuit control.

[0033] Furthermore, the control chamber oil circuit also includes a return oil circuit, which is connected to the control chamber through the control oil port. This return oil circuit is used to draw out the hydraulic oil in the control chamber, thereby reducing the pressure inside the control chamber. This makes the combined oil pressure of the second main oil circuit and the first main oil circuit greater than the force of the control chamber and the spring, and finally opens the valve core assembly to realize the connection between the second main oil circuit and the first main oil circuit.

[0034] 5. A hydraulically controlled check valve is installed on the return oil line to prevent hydraulic oil from flowing out of the control chamber and keep the valve core assembly closed; the second pilot oil line is connected to the hydraulically controlled check valve and is used to open the hydraulically controlled check valve according to the pilot signal, so that the control return oil line is kept open in the direction of hydraulic oil flowing out of the control chamber, ensuring smooth oil return and executing the valve core assembly opening action.

[0035] 6. An adjustable flow valve is also provided on the return oil line. By adjusting this valve, the state and rate of return oil can be changed, and the opening time of the valve core can be extended to more than two seconds, thereby improving the pressure shock problem caused by the valve core opening speed being too fast.

[0036] 7. The control cover also includes a pilot oil port, to which both the first pilot oil circuit and the second pilot oil circuit are connected, so as to realize the centralized and unified input of external control signals. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the hydraulic control of the cover plate in an embodiment of the present invention;

[0038] Figure 2 This is a hydraulic schematic diagram of the cartridge valve in an embodiment of the present invention;

[0039] Figure 3 This is a pressure curve diagram of the cartridge valve during operation in an embodiment of the present invention.

[0040] Figure label:

[0041] 1. Pilot-controlled pump set;

[0042] 2. Main pump unit;

[0043] 3. Valve block; 31. Valve core assembly;

[0044] 4. Control cover plate; 41. Sequence valve; 42. Hydraulic check valve; 43. Normally open logic valve; 44. Pressure build-up control valve; 45. Adjustable flow valve;

[0045] 461. First damping; 462. Second damping; 463. Third damping; 464. Fourth damping;

[0046] 471. First pressure measurement channel; 472. Second pressure measurement channel; 473. Third pressure measurement channel; 474. Fourth pressure measurement channel; 475. Fifth pressure measurement channel; 476. Sixth pressure measurement channel; 477. Seventh pressure measurement channel;

[0047] 51. First main oil circuit; 52. Second main oil circuit;

[0048] 61. First pilot oil circuit; 62. Second pilot oil circuit;

[0049] 71. Oil supply line; 72. Oil return line;

[0050] 81. First bypass oil circuit; 82. Second bypass oil circuit;

[0051] 9. Construct a pressurized oil circuit. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0053] This invention provides a control cover plate 4 for a cartridge valve block 3, referring to... Figure 1 ,include:

[0054] The pressure-building oil circuit 9 includes a second pressure-building oil port Z2 and a first pressure-building oil port Z1;

[0055] The second pressure port Z2 is used to obtain hydraulic oil from the second main oil circuit 52 of valve block 3;

[0056] The first pressure-building port Z1 is used to supply hydraulic oil to the first main oil circuit 51 of the valve block 3 to balance the oil pressure in the second main oil circuit 52 and the first main oil circuit 51.

[0057] Pressure building control valve 44 is installed in pressure building oil circuit 9 and is used to control the opening and closing of pressure building oil circuit 9;

[0058] The first pilot oil circuit 61 is connected to the pressure building control valve 44 and is used to control the opening of the pressure building control valve 44.

[0059] The control chamber oil circuit includes a control oil port C, which is used to connect to the control chamber of the valve core assembly 31 in the valve block 3.

[0060] The present invention provides a valve block 3 for a cartridge valve, referring to... Figure 2 ,include:

[0061] Second main oil circuit 52, first main oil circuit 51 and valve chamber;

[0062] The valve chamber is used to install the valve core assembly 31, which is used to control the connection and disconnection between the second main oil passage 52 and the first main oil passage 51.

[0063] The second bypass oil passage 82 and the first bypass oil passage 81 are respectively connected to the second main oil passage 52 and the first main oil passage 51;

[0064] The second bypass oil passage 82 includes a second bypass oil port, which is used to supply hydraulic oil to the second pressure-building oil port Z2 on the control cover plate 4;

[0065] The first bypass oil passage 81 includes a first bypass oil port for obtaining hydraulic oil from the first pressure-building oil port Z1 on the control cover plate 4 to balance the oil pressure in the second main oil passage 52 and the first main oil passage 51.

[0066] Specifically, refer to Figure 1 and Figure 2 The control cover plate 4 is provided with a pilot oil port X, a control oil port C, a second pressure-building oil port Z2, a first pressure-building oil port Z1, and a return oil port Y. The valve block 3 is provided with a pilot oil port X, a second main oil port B, and a first main oil port A. The pilot oil port X on the valve block 3 and the pilot oil port X on the control cover plate 4 are interconnected through a channel on the valve block 3.

[0067] Specifically, refer to Figure 2 When the cartridge valve is in operation, control oil is introduced through the pilot port X. The control oil flows through the first pilot oil passage 61 to the pressure building control valve 44, which opens. High-pressure oil is injected through the second main oil port B. The high-pressure oil flows from the second main oil passage 52 through the second bypass oil passage 82 into the second pressure building port Z2. At this time, the pressure building control valve 44 is open, and the pressure building oil passage 9 is connected. The high-pressure oil flows out from the first pressure building port Z1 through the pressure building oil passage 9, enters the first bypass oil passage 81, and finally flows into the first main oil passage 51 for pre-pressure building, thus achieving hydraulic balance between the second main oil passage 52 and the first main oil passage 51.

[0068] Specifically, the pressure build-up control valve 44 is a normally closed logic valve.

[0069] In some embodiments of the present invention, the control chamber oil circuit includes an oil supply circuit 71, which is connected to the control oil port C and the second pressure building oil port Z2 respectively, for supplying hydraulic oil to the control chamber; the oil supply circuit 71 is provided with a normally open logic valve 43.

[0070] Specifically, refer to Figure 1 and Figure 2Oil supply line 71 is connected to pressure building line 9. High-pressure oil flows from pressure building line 9 into oil supply line 71. At this time, normally open logic valve 43 on oil supply line 71 is opened and oil supply line 71 is open. High-pressure oil flows out from control port C through normally open logic valve 43 and second damper 462 and enters control chamber of valve core assembly 31. The combined force of pressure and spring force in control chamber is greater than the combined force of second main oil line 52 and first main oil line 51. Valve core assembly 31 remains closed and the second main oil line 52 and first main oil line 51 are disconnected.

[0071] In some embodiments of the present invention, the control cover plate 4 further includes a second pilot oil passage 62, which is connected to a normally open logic valve 43 and is used to close the normally open logic valve 43 to disconnect the oil supply passage 71.

[0072] In some embodiments of the present invention, a sequence valve 41 is provided on the second pilot oil circuit 62, and the sequence valve 41 is opened after the pressure building control valve 44.

[0073] Specifically, refer to Figure 1 and Figure 2 Both the first pilot oil passage 61 and the second pilot oil passage 62 are connected to the pilot oil port X. After control oil is introduced into the pilot oil port X and the pressure build-up control valve 44 is opened, the oil pressure in the second pilot oil passage 62 rises to the set value of the sequence valve 41. At this time, the sequence valve 41 opens, the second pilot oil passage 62 is open, and the control oil flows through the second pilot oil passage 62 to the normally open logic valve 43. At this time, the normally open logic valve 43 closes, the oil supply passage 71 is disconnected, and high-pressure oil is prevented from entering the control chamber of the valve core assembly 31.

[0074] In some embodiments of the present invention, the control chamber oil circuit further includes a return oil circuit 72, which is connected to the control chamber through the control oil port C and is used to allow hydraulic oil to flow out of the control chamber.

[0075] In some embodiments of the present invention, the control cover plate 4 further includes a second pilot oil passage 62; a hydraulic control check valve is provided on the return oil passage 72, and the second pilot oil passage 62 is connected to the hydraulic control check valve to control the return oil passage 72 to be open in the direction of hydraulic oil flowing out of the control chamber.

[0076] Specifically, refer to Figure 1 and Figure 2 The return oil circuit 72 connects the control oil port C and the return oil port Y. The second pilot oil circuit 62 connects the hydraulically controlled check valve on the return oil circuit 72 and the logic normally open valve on the delivery oil circuit 71. The control oil flows through the second pilot oil circuit 62 to the hydraulically controlled check valve. At this time, the hydraulically controlled check valve is open, the return oil circuit 72 is open, and the combined force of the pressure in the control chamber and the spring force is less than the combined force of the second main oil circuit 52 and the first main oil circuit 51. The valve core assembly 31 remains open, and the second main oil circuit 52 and the first main oil circuit 51 are connected.

[0077] Specifically, refer to Figure 1 and Figure 2 The control circuits of the pressure-building control valve 44, normally open logic valve 43, hydraulic check valve, and sequence valve 41 are all connected to the return oil circuit 72 and connected to the return oil port Y. When the pilot oil port X returns oil, the pressure-building control valve 44 resets and closes, the hydraulic check valve resets and closes, the normally open logic valve 43 resets and opens, and the pressure-building control valve 44 resets and closes. At this time, the oil supply circuit 71 is open, and high-pressure oil enters the control chamber. The combined force of the pressure in the control chamber and the spring force is greater than the combined force of the second main oil circuit 52 and the first main oil circuit 51, so the valve core assembly 31 closes again, and the second main oil circuit 52 and the first main oil circuit 51 are disconnected.

[0078] In some embodiments of the present invention, an adjustable flow valve 45 is provided on the return oil circuit 72.

[0079] In some embodiments of the present invention, a pilot oil port X is included, and a first pilot oil passage 61 and a second pilot oil passage 62 are connected to the pilot oil port X.

[0080] In some embodiments of the present invention, reference is made to Figure 1 and Figure 2 The control cover plate 4 and valve block 3 are provided with a first pressure measuring channel 471, a second pressure measuring channel 472, a third pressure measuring channel 473, a fourth pressure measuring channel 474, a fifth pressure measuring channel 475, a sixth pressure measuring channel 476, and a seventh pressure measuring channel 477. The first pressure measuring channel 471 is connected to the pilot oil port X. The second pressure measuring channel 472 is connected between the first damping 461 and the hydraulic check valve or normally open logic valve 43 on the second pilot oil circuit 62. The third pressure measuring channel 473 and the fourth pressure measuring channel 474 are connected to both sides of the adjustable flow valve 45 on the return oil circuit 72. The fifth pressure measuring channel 475 is connected to the first pressure building oil port Z1. The sixth pressure measuring channel 476 is connected to the control chamber oil port C. The seventh pressure measuring channel 477 is connected to the second main oil circuit 52.

[0081] In some embodiments of the present invention, reference is made to Figure 1 and Figure 2 The control cover plate 4 also includes a first damper 461, a third damper 463 and a fourth damper 464; the first damper 461 is disposed on the second pilot oil circuit 62 and is located between the second pressure measuring channel 472 and the sequence valve 41; the third damper 463 is disposed on the control circuit of the sequence valve 41; the fourth damper 464 is disposed on the pressure building oil circuit 9 and is located between the pressure building control valve 44 and the second pressure building port Z2.

[0082] The present invention provides a cartridge valve, with reference to Figure 1 and Figure 2 It includes a pilot control pump group 1, a main pump group 2, and the aforementioned control cover plate 4 and valve block 3; the pilot control pump group 1 is connected to the pilot oil port X on the valve block 3, and the main pump group 2 is connected to the second main oil port B on the valve block 3.

[0083] It should be noted that the connection methods between the pilot control pump group 1, the main pump group 2, and the valve block 3 and the control cover plate 4 can all be implemented using existing technologies known to those skilled in the art, and therefore will not be elaborated here.

[0084] In some embodiments of the present invention, reference is made to Figure 3 When the control valve is working, the opening speed of the valve core is adjusted by adjusting the opening degree of the throttle valve, and the time taken for the valve core to open is more than two seconds.

[0085] In the description of this invention, 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," "counterclockwise," "axial," "radial," and "circumferential" 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 invention 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 invention.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0087] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0088] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0089] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0090] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A control cover plate for a cartridge valve block, characterized in that, include: The pressure-building oil circuit (9) includes a second pressure-building oil port and a first pressure-building oil port; The second pressure-building port is used to obtain hydraulic oil from the second main oil circuit (52) of the valve block (3); The first pressure-building port is used to supply hydraulic oil to the first main oil circuit (51) of the valve block (3) to balance the oil pressure in the second main oil circuit (52) and the first main oil circuit (51); A pressure building control valve (44) is installed in the pressure building oil circuit (9) and is used to control the opening and closing of the pressure building oil circuit (9); The first pilot oil circuit (61) is connected to the pressure building control valve (44) and is used to control the opening of the pressure building control valve (44); The control chamber oil circuit includes a control oil port for connecting to the control chamber of the valve core assembly (31) in the valve block (3).

2. The control cover plate according to claim 1, characterized in that, The control chamber oil circuit includes an oil supply circuit (71), which is connected to the control oil port and the second pressure building oil port respectively, and is used to supply hydraulic oil to the control chamber; the oil supply circuit (71) is provided with a normally open logic valve (43).

3. The control cover plate according to claim 2, characterized in that, It also includes a second pilot oil passage (62), which is connected to the normally open logic valve (43) and is used to close the normally open logic valve (43) to disconnect the oil supply passage (71).

4. The control cover plate according to claim 3, characterized in that, The second pilot oil circuit (62) is provided with a sequence valve (41), which is opened after the pressure building control valve (44).

5. The control cover plate according to claim 2, characterized in that, The control chamber oil circuit also includes a return oil circuit (72), which is connected to the control chamber through the control oil port for the hydraulic oil to flow out of the control chamber.

6. The control cover plate according to claim 5, characterized in that, It also includes a second pilot oil circuit (62); the return oil circuit (72) is provided with a hydraulic control check valve, and the second pilot oil circuit (62) is connected to the hydraulic control check valve to control the return oil circuit (72) to be open in the direction of the hydraulic oil flowing out of the control chamber.

7. The control cover plate according to claim 5, characterized in that, An adjustable flow valve (45) is provided on the return oil circuit (72).

8. The control cover plate according to claim 3 or 6, characterized in that, It includes a pilot port, and the first pilot oil passage (61) and the second pilot oil passage (62) are connected to the pilot port.

9. A valve block for a cartridge valve, characterized in that, include: The second main oil circuit (52), the first main oil circuit (51), and the valve chamber; The valve chamber is used to install the valve core assembly (31), and the valve core assembly (31) is used to control the connection and disconnection between the second main oil circuit (52) and the first main oil circuit (51); The second bypass oil passage (82) and the first bypass oil passage (81) are respectively connected to the second main oil passage (52) and the first main oil passage (51); The second bypass oil passage (82) includes a second bypass oil port for supplying hydraulic oil to the second pressure-building oil port on the control cover plate; The first bypass oil passage (81) includes a first bypass oil port for obtaining the hydraulic oil from the first pressure-building oil port on the control cover plate, so as to balance the oil pressure in the second main oil passage (52) and the first main oil passage (51).

10. A cartridge valve, characterized in that, Includes the control cover as described in any one of claims 1 to 8.

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