Steering valve group, hydraulic control system and mining dump truck

Abstract

The invention provides a steering valve group, a hydraulic control system and a mining dump truck, and belongs to the technical field of engineering mine cars. The steering valve set comprises an oil feeding port, a first oil outlet, a second oil outlet, a first control assembly and a second control assembly. The oil feeding port is configured to be connected with a hydraulic pump and used for providing oil liquid into the conversion valve set. The first control assembly is configured to be used for leading oil liquid of the oil feeding port into the first oil outlet. The first oil outlet is configured to be connected with a first steering energy accumulator and used for providing oil liquid for the first steering energy accumulator; the second control assembly is configured to be used for leading oil flowing out of the first control assembly into the second oil outlet. The second oil outlet is configured to be connected with a second steering energy accumulator and used for providing oil liquid for the second steering energy accumulator. The steering valve group can improve the reliability of the mining dump truck and reduce the manufacturing cost of the mining dump truck at the same time.

Description

Technical Field

[0001] The present disclosure relates to the technical field of engineering mining vehicles, and in particular to a steering valve group, a hydraulic control system and a mining dump truck. Background Art

[0002] The hydraulic system of a mining dump truck is generally divided into a steering system, a braking system, a lifting system and a cooling system. First, the steering system and the braking system are directly related to the safety of the mining truck. Secondly, the hydraulic system has many components and the installation space of the mining truck frame is small, which makes the installation of the hydraulic system components cumbersome and the hydraulic pipeline connection complicated. When there is a fault in the hydraulic system that needs to be checked, it is necessary to disassemble and assemble the components and hydraulic pipelines, which brings inconvenience to the maintenance personnel. Thirdly, the lifting cylinder of the mining dump truck has a large bore and requires a large-displacement pump as a power source, or a combination of multiple small-displacement pumps as a power source. This not only increases the cost of the mining truck, but also increases the difficulty of installing the lifting pump.

[0003] Therefore, how to reduce the hydraulic components of mining dump trucks, save the connection space of hydraulic pipelines, and improve the reliability of the hydraulic system of mining trucks is a problem that those skilled in the art need to solve urgently. It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present disclosure is to overcome the deficiencies of the above-mentioned prior art and provide a steering valve group, a control system and a mining dump truck, so as to reduce the number of pipeline connections of the control system and the mining dump truck using the control system, so as to reduce the cost of the mining dump truck.

[0005] According to a first aspect of the present disclosure, there is provided a steering valve assembly, comprising an oil supply port, a first oil outlet port, a second oil outlet port, a first control assembly and a second control assembly;

[0006] The oil supply port is configured to be connected to a hydraulic pump for providing oil to the steering valve group;

[0007] The first control component is configured to pass the oil in the oil supply port into the first oil outlet;

[0008] The first oil outlet is configured to be connected to a first steering accumulator for providing oil to the first steering accumulator;

[0009] The second control component is configured to pass the oil flowing out of the first control component into the second oil outlet;

[0010] The second oil outlet is configured to be connected to a second steering accumulator to provide oil to the second steering accumulator.

[0011] According to one embodiment of the present disclosure, the first control assembly includes a first control valve;

[0012] The oil inlet of the first control valve is connected to the oil supply port, and the oil outlet of the first control valve, the first oil outlet, and the second control component are connected to each other.

[0013] According to one embodiment of the present disclosure, the second control assembly includes a second control valve;

[0014] The oil inlet of the second control valve, the oil outlet of the first control valve, and the first oil outlet are connected to each other, and the oil outlet of the second control valve is connected to the second oil outlet.

[0015] According to an embodiment of the present disclosure, the steering valve assembly further includes a first pipeline, a third oil outlet, and a first solenoid valve;

[0016] One end of the first pipeline, the oil supply port, and the oil inlet of the first control valve are connected to each other, and the other end is connected to the third oil outlet;

[0017] The first solenoid valve is disposed on the first pipeline and is configured to enable the oil supply port to be selectively connected to the third oil outlet port;

[0018] The third oil outlet is configured to provide oil to a main valve of the lifting system.

[0019] According to an embodiment of the present disclosure, the steering valve assembly further includes a second pipeline and a fourth oil outlet;

[0020] One end of the second pipeline, the oil outlet of the first control valve, and the oil inlet of the second control valve are connected to each other, and the other end is connected to the fourth oil outlet;

[0021] The fourth oil outlet is used to provide oil to the brake system.

[0022] According to an embodiment of the present disclosure, the steering valve group further includes a fifth oil outlet, a first oil return port and a relief valve;

[0023] The oil inlet of the overflow valve is connected to the oil outlet of the second control valve, the fifth oil outlet and the second oil outlet;

[0024] The fifth oil outlet is configured to provide oil to a pilot valve of a lifting system;

[0025] The oil outlet of the overflow valve is communicated with the first oil return port;

[0026] When the pressure of the oil inlet of the relief valve reaches a predetermined pressure value, the oil at the oil inlet of the relief valve flows into the first oil return port;

[0027] The first oil return port is configured to be connected to an oil tank and is used to return oil to the oil tank.

[0028] According to an embodiment of the present disclosure, the steering valve group further includes a third pipeline, a second solenoid valve, a second oil return port, and a damping hole;

[0029] One end of the third pipeline, the oil outlet of the second control valve, and the second oil outlet are connected to each other, and the other end of the third pipeline is connected to the first oil return port;

[0030] The second solenoid valve is disposed on the third pipeline and is configured to enable communication between the second oil outlet and the first oil return port, and communication between the first oil outlet and the first oil return port;

[0031] The damping hole is arranged on the third pipeline and is located at one side of the oil inlet of the second solenoid valve.

[0032] According to an embodiment of the present disclosure, the steering valve group further includes a sixth oil outlet, a first oil return port, and a second oil return port;

[0033] The sixth oil outlet is selectively connected to the second oil return port through a flow amplifier, and the second oil return port is connected to the first oil return port.

[0034] According to a second aspect of the present disclosure, a hydraulic control system is provided, comprising a steering valve group.

[0035] According to a third aspect of the present disclosure, there is provided a mining dump truck, comprising the control system.

[0036] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0038] Figure 1 The figure is a schematic diagram of the connection structure between the steering valve group and various systems in one embodiment of the present invention.

[0039] Explanation of the accompanying drawings: P0, oil supply port; P1, first oil outlet; P2, second oil outlet; P3, third oil outlet; P4, fourth oil outlet; P5, fifth oil outlet; P6, sixth oil outlet; P7, first oil return port; P8, second oil return port; L1, first pipeline; L2, second pipeline; A1, first control component; A11, first control valve; A2, second control component; A21, second control valve; B1, first solenoid valve; B2, second solenoid valve; C1, overflow valve; D1, damping hole; E1, first steering accumulator; E2, second steering accumulator; E3, lifting system; E4, braking system; E5, flow amplifier; E6, steering valve group; H1, first interface; H2, second interface; H3, third interface; H4, fourth interface; H5, fifth interface. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0041] In the related art, the hydraulic system of a mining dump truck can be divided into a steering system, a braking system, a lifting system, and a cooling system. Among them, the steering system and the braking system are directly related to the safety of the mining truck. In the current mining dump trucks, due to the large number of hydraulic system components and the small installation space of the mining truck frame, the installation of hydraulic components is cumbersome; furthermore, the hydraulic pipeline connection is complicated. When the hydraulic system has a fault and needs to be checked, it is necessary to disassemble and assemble the hydraulic components and hydraulic pipelines, which brings inconvenience to the maintenance personnel. At the same time, the lifting cylinder of the mining dump truck has a large cylinder diameter, and a large-displacement pump is required as a power source, or a combination of multiple small-displacement pumps is required as a power source, which increases the manufacturing cost of the mining dump truck, and increases the difficulty of installing the lifting pump, which also increases the difficulty of manufacturing the mining dump truck.

[0042] Based on this, the present application provides a mining dump truck. The mining dump truck includes a hydraulic control system, wherein the hydraulic control system may include a power system, a first steering accumulator E1, a second steering accumulator E2, a lifting system E3, a braking system E4 and a steering valve group E6.

[0043] In the embodiment of the present disclosure, the power system is used to provide a power source to the first steering accumulator E1, the second steering accumulator E2, the lifting system E3 and the braking system E4. As an example, the power system can be a variable pump, a steering pump or a fixed displacement pump, etc., and the embodiment of the present application does not impose specific restrictions on this. The first steering accumulator E1 is used as an auxiliary power source for the steering system of a mining dump truck; the second steering accumulator E2 is used as an auxiliary power source for the steering system of a mining dump truck, and in one embodiment, the first steering accumulator E1 and the second steering accumulator E2 are arranged relatively independently of each other; the lifting system E3 is used to control the lifting movement of the mining dump truck; the braking system E4 is used to control the braking of the mining dump truck.

[0044] Figure 1 The following is an example of the connection structure diagram of the steering valve group and the steering valve group and various systems. Figure 1 , a detailed introduction is given to the steering valve group E6 in the embodiment of the present disclosure.

[0045] In some embodiments of the present disclosure, the steering valve group E6 includes an oil supply port P0, a first oil outlet port P1, a second oil outlet port P2, a first control component A1 and a second control component A2; the oil supply port P0 is configured to be connected to a hydraulic pump for providing oil to the steering valve group E6; the first control component A1 is configured to pass the oil from the oil supply port P0 into the first oil outlet port P1; the first oil outlet P1 is configured to be connected to the first steering accumulator E1 for providing oil to the first steering accumulator E1; the second control component A2 is configured to pass the oil flowing out of the first control component A1 into the second oil outlet P2; the second oil outlet P2 is configured to be connected to the second steering accumulator E2 for providing oil to the second steering accumulator E2.

[0046] In the disclosed embodiment, when the oil enters the steering valve group E6 through the oil supply port P0, the first control component A1 is opened, and the oil is passed into the first oil outlet P1 through the first control component A1, and the oil enters the first steering accumulator E1 through the first oil outlet P1, so that the first steering accumulator E1 can be used as an auxiliary power source for steering of a mining dump truck; when the oil enters the steering valve group E6 through the oil supply port P0, the first control component A1 and the second control component A2 are opened, and the oil can be passed into the second oil outlet P2 through the first control component A1 and the second control, and the oil enters the second steering accumulator E2 through the second oil outlet P2, and the second steering accumulator E2 can be used as an auxiliary power source for the steering system of a mining dump truck. In this way, the first control component A1 and the first control component A1 can be set to isolate the first oil outlet P1 from the second oil outlet P2, so that the first steering accumulator E1 and the second steering accumulator E2 are relatively independent of each other, so that when the first steering accumulator E1 is damaged, it will not affect the normal operation of the second steering accumulator E2, thereby improving the steering stability of the mining dump truck.

[0047] It is understandable that in the embodiment of the present disclosure, the mining dump truck can be divided into two modes: normal steering and emergency steering. In normal steering, the oil supply port P0 can be used as the power source for steering, but in emergency steering, the first steering accumulator E1 and the second steering accumulator E2 can provide power at the same time to meet the power required for emergency steering of the mining dump truck, and at the same time absorb system pulsation, thereby improving the reliability of steering of the mining dump truck.

[0048] In some embodiments of the present disclosure, the first control assembly A1 includes a first control valve A11; the oil inlet of the first control valve A11 is connected to the oil supply port P0, and the oil outlet of the first control valve A11, the first oil outlet P1, and the second control assembly A2 are connected to each other. Thus, when the first control valve A11 is opened, the oil extracted by the hydraulic pump can pass through the first control valve A11 and enter the first oil outlet P1, and the first oil outlet P1 can provide oil to the first steering accumulator E1, so that the first steering accumulator E1 corresponding to the first oil outlet P1 can operate.

[0049] In some embodiments of the present disclosure, the second control assembly A2 includes a second control valve A21; the oil inlet of the second control valve A21, the oil outlet of the first control valve A11, and the first oil outlet P1 are interconnected, and the oil outlet of the second control valve A21 is connected to the second oil outlet P2. In this way, when the first control valve A11 is opened, the oil drawn by the hydraulic pump can flow into the oil outlet of the first control valve A11 through the oil inlet of the first control valve A11, and when the second control valve A21 is opened, the oil flows into the oil outlet of the second control valve A21 through the oil inlet of the second control valve A21, and the oil flowing out of the second control valve A21 enters the second oil outlet P2, and the second oil outlet P2 can provide oil to the second steering accumulator E2, so that the second steering accumulator E2 corresponding to the second oil outlet P2 can operate.

[0050] In some embodiments of the present disclosure, the steering valve group E6 further includes a first pipeline L1, a third oil outlet P3 and a first solenoid valve B1; one end of the first pipeline L1, the oil supply port P0 and the oil inlet of the first control valve A11 are connected to each other, and the other end of the first pipeline L1 is connected to the third oil outlet P3; the first solenoid valve B1 is installed on the first pipeline L1, and the first solenoid valve B1 is configured to allow the oil supply port P0 to be selectively connected to the third oil outlet P3; the third oil outlet P3 is configured to provide oil to the lifting system E3. In this way, when the first solenoid valve B1 is opened, the oil at the oil supply port P0 can pass through the first solenoid valve B1 into the third oil outlet P3, and the third oil outlet P3 can provide oil to the lifting system E3, so that the lifting system E3 corresponding to the third oil outlet P3 can operate. At the same time, when the mining dump truck is lifting, the steering system (such as the first steering accumulator E1 and the second steering accumulator E2) does not need oil, and the first solenoid valve B1 can introduce the oil from the oil supply port P0 into the lifting system E3, and the oil from the oil supply port P0 merges with the oil from the pressure pump in the lifting system E3. In this way, the number of lifting pumps in the lifting system E3 can be reduced, or a lifting pump with a smaller displacement can be selected to meet the lifting needs of the mining dump truck, effectively reducing the cost of the mining dump truck and saving the installation space of the lifting pump.

[0051] Further, in some embodiments of the present disclosure, the steering valve group E6 also includes a fifth oil outlet P5, a first oil return port P7 and a relief valve C1; the oil inlet of the relief valve C1 is connected to the oil outlet of the second control valve A21, the fifth oil outlet P5 and the second oil outlet P2; the oil outlet of the relief valve C1 is connected to the first oil return port P7; wherein, when the pressure of the oil inlet of the relief valve C1 reaches a predetermined pressure value, the oil in the oil inlet of the relief valve C1 flows into the first oil return port P7; the first oil return port P7 is configured to be connected to the oil tank for returning the oil to the oil tank. It is understandable that when the pressure in the control system is higher than 200 bar, the oil outlet of the relief valve C1 is connected to the first oil return port P7, at which time part of the oil flows back to the oil tank, realizing the pressure reduction of the control system, preventing the phenomenon of excessive pressure in the control system, thereby improving the reliability of the hydraulic control system and the reliability of the mining dump truck using the hydraulic control system.

[0052] Furthermore, as an example, a lifting pilot valve can be installed at the fifth oil outlet P5. When the first control valve A11 and the second control valve A21 are opened, the oil at the oil supply port P0 enters the fifth oil outlet P5 through the first control valve A11 and the second control valve A21, and the oil enters the lifting pilot valve through the fifth oil outlet P5, which can provide a stable control pressure for the lifting pilot valve, and the lifting pilot valve can control the operation of the lifting system E3.

[0053] In some embodiments of the present disclosure, the steering valve group E6 further includes a second pipeline L2 and a fourth oil outlet P4; one end of the second pipeline L2, the oil outlet of the first control valve A11, and the oil inlet of the second control valve A21 are interconnected, and the other end is connected to the fourth oil outlet P4; the fourth oil outlet P4 is used to provide oil to the brake system E4. It can be understood that when the mining dump truck needs to brake, the first control valve A11 is opened, and the oil in the oil supply port P0 flows to the outlet position of the first control valve A11 through the oil inlet of the first control valve A11, and part of the oil enters the brake system E4 to provide power oil for the brake system E4, so that the mining dump truck can achieve steering and braking actions.

[0054] In some embodiments of the present disclosure, the steering valve group E6 also includes a third pipeline, a second solenoid valve B2, a second oil return port P8 and a damping hole D1; one end of the third pipeline, the oil outlet of the second control valve A21, and the second oil outlet P2 are interconnected, and the other end of the third pipeline is connected to the first oil return port P7; the second solenoid valve B2 is arranged on the third pipeline, and is configured to enable communication between the second oil outlet P2 and the first oil return port P7, and between the first oil outlet P1 and the first oil return port P7; the damping hole D1 is arranged on the third pipeline, on the side of the oil inlet of the second solenoid valve B2.

[0055] In the embodiment of the present disclosure, when the mining dump truck stops operating, the second solenoid valve B2 is opened. The second solenoid valve B2 is opened, so that the oil of the first oil outlet P1 can enter the first oil return port P7 through the second solenoid valve B2, thereby releasing the pressure of the first oil outlet P1; and the oil of the second oil outlet P2 can enter the first oil return port P7 through the second solenoid valve B2, and the pressure of the second oil outlet P2 can be released, so as to ensure that the steering system (such as the first steering accumulator E1 and the second steering accumulator E2) is depressurized when the mining dump truck stops operating, thereby improving the reliability of the mining dump truck using the hydraulic control system. In the embodiment of the present disclosure, the damping hole D1 set on the third pipeline can reduce the impact of the pressure of the first oil outlet P1 and the second oil outlet P2 on the second solenoid valve B2, so that the service life of the second solenoid valve B2 can be increased, and the reliability of the hydraulic control system can be improved to a certain extent.

[0056] In some embodiments of the present disclosure, the steering valve group E6 further includes a sixth oil outlet P6, a first oil return port P7, and a second oil return port P8; the sixth oil outlet P6 and the second oil return port P8 are selectively connected through the flow amplifier E5, and the second oil return port P8 is connected to the first oil return port P7. Specifically, the first control valve A11 and the second control valve A21 are opened, and the oil at the oil supply port P0 enters the sixth oil outlet P6 through the first control valve A11 and the second control valve A21, and the oil enters the flow amplifier E5 through the sixth oil outlet P6, and part of the oil in the flow amplifier E5 is connected to the second oil return port P8 through the oil outlet of the flow amplifier E5, and the second oil return port P8 is connected to the first oil return port P7, so that the oil in the flow amplifier E5 can flow back to the oil tank.

[0057] In some embodiments of the present disclosure, the steering valve group E6 may further include a first interface H1; as an example, the first interface H1 and the oil supply port P0 may be located on the same side of the steering valve group E6, and the first interface H1 is used to connect to an external pressure sensor, and the pressure sensor can detect the pressure inside the steering valve group E6, so as to facilitate timely evaluation of the pressure inside the steering valve group E6.

[0058] In some embodiments of the present disclosure, the steering valve assembly E6 may further include a second interface H2. As an example, the second interface H2 and the first oil outlet P1 may be located on the same side of the steering valve assembly E6, and the second interface H2 is used to connect to a pressure measuring connector, so as to detect the pressure in the steering valve assembly E6.

[0059] In some embodiments of the present disclosure, the steering valve group E6 may further include a third interface H3. As an example, the third interface H3, the second interface H2 and the first oil outlet P1 may be located on the same side of the steering valve group E6, and the third interface H3 may be used as a backup interface. It is understandable that when the second interface H2 is damaged, the third interface H3 may be used as a connection port between an external pressure measuring device and the steering valve group E6, so that the pressure inside the steering valve group E6 can also be detected.

[0060] In some embodiments of the present disclosure, the steering valve group E6 may further include a fourth interface H4; as an example, the fourth interface H4 and the third interface H3 may be located on the same side of the steering valve group E6, and the fourth interface H4 is used to connect to an external pressure sensor, which can detect the pressure inside the steering valve group so as to facilitate timely evaluation of the pressure inside the steering valve group.

[0061] In some embodiments of the present disclosure, the steering valve group E6 may further include a fifth interface H5; as an example, the fifth interface H5 and the fourth interface H4 may be located on the same side of the steering valve group E6, and the fifth interface H5 is used to connect to an external pressure measuring structure, and the external pressure measuring structure can detect the pressure inside the steering valve group E6, so as to facilitate timely evaluation of the pressure inside the steering valve group E6.

[0062] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A steering valve group, wherein: It includes an oil supply port, a first oil outlet port, a second oil outlet port, a first control component and a second control component; The oil supply port is configured to be connected to a hydraulic pump for providing oil to the steering valve group; The first control component is configured to pass the oil in the oil supply port into the first oil outlet; The first oil outlet is configured to be connected to a first steering accumulator for providing oil to the first steering accumulator; The second control component is configured to pass the oil flowing out of the first control component into the second oil outlet; The second oil outlet is configured to be connected to a second steering accumulator to provide oil to the second steering accumulator.

2. The steering valve assembly according to claim 1, wherein: The first control assembly includes a first control valve; The oil inlet of the first control valve is connected to the oil supply port, and the oil outlet of the first control valve, the first oil outlet, and the second control component are connected to each other.

3. The steering valve assembly according to claim 2, wherein: The second control assembly includes a second control valve; The oil inlet of the second control valve, the oil outlet of the first control valve, and the first oil outlet are connected to each other, and the oil outlet of the second control valve is connected to the second oil outlet.

4. The steering valve assembly according to claim 2, wherein: The steering valve group also includes a first pipeline, a third oil outlet and a first solenoid valve; One end of the first pipeline, the oil supply port, and the oil inlet of the first control valve are connected to each other, and the other end is connected to the third oil outlet; The first solenoid valve is disposed on the first pipeline and is configured to enable the oil supply port to be selectively connected to the third oil outlet port; The third oil outlet is configured to provide oil to a main valve of the lifting system.

5. The steering valve assembly according to claim 3, wherein: The steering valve assembly also includes a second pipeline and a fourth oil outlet; One end of the second pipeline, the oil outlet of the first control valve, and the oil inlet of the second control valve are connected to each other, and the other end is connected to the fourth oil outlet; The fourth oil outlet is used to provide oil to the brake system.

6. The steering valve assembly according to claim 3, wherein: The steering valve group further includes a fifth oil outlet, a first oil return port and a relief valve; The oil inlet of the overflow valve is connected to the oil outlet of the second control valve, the fifth oil outlet and the second oil outlet; The fifth oil outlet is configured to provide oil to a pilot valve of a lifting system; The oil outlet of the overflow valve is connected to the first oil return port; When the pressure of the oil inlet of the relief valve reaches a predetermined pressure value, the oil at the oil inlet of the relief valve flows into the first oil return port; The first oil return port is configured to be connected to an oil tank and is used to return oil to the oil tank.

7. The steering valve assembly according to claim 6, wherein: The steering valve group further includes a third pipeline, a second solenoid valve, a second oil return port and a damping hole; One end of the third pipeline, the oil outlet of the second control valve, and the second oil outlet are connected to each other, and the other end of the third pipeline is connected to the first oil return port; The second solenoid valve is disposed on the third pipeline and is configured to enable communication between the second oil outlet and the first oil return port, and communication between the first oil outlet and the first oil return port; The damping hole is arranged on the third pipeline and is located at one side of the oil inlet of the second solenoid valve.

8. The steering valve assembly according to claim 1, wherein: The steering valve group also includes a sixth oil outlet, a first oil return port and a second oil return port; The sixth oil outlet port is selectively connected to the second oil return port through a flow amplifier, and the second oil return port is connected to the first oil return port.

9. A hydraulic control system, wherein: A steering valve assembly comprising any one of claims 1 to 8.

10. A mining dump truck, wherein: Includes the control system described in claim 9.

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