Hydraulic valve assembly

Abstract

The invention relates to a hydraulic valve, particularly provides a hydraulic valve assembly, and aims to solve or relieve the problem of pressure difference between an oil inlet cavity and an oil outlet cavity of a hydraulic valve under a part of working conditions in the prior art. In order to achieve the purpose, the hydraulic valve assembly comprises a main valve body, a main valve element assembly, a control oil cylinder, a control piston and a guide assembly, and the main valve body comprises a main oil hole and a main valve element hole; the main valve element assembly is inserted into the main valve element hole, and the main valve element assembly and the main valve element hole form a valve line sealing structure. The control oil cylinder is positioned above the main valve body; the control piston is installed in the main valve element assembly and extends into the control oil cylinder together with the main valve element assembly. The guide assembly is arranged above the control oil cylinder and used for controlling the movement direction of the main valve element assembly to form different working states. All the parts are matched with one another so that external high-pressure oil can be used for pushing the control piston to open the main valve element assembly. Under the condition that the technical scheme is adopted, the residual pressure difference is eliminated through verification of a test bed.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valves, and specifically provides a hydraulic valve assembly. Background Technology

[0002] A hydraulic valve is an automated component operated by pressurized oil. It is controlled by the pressurized oil in a regulating valve and is typically used in combination with a solenoid regulating valve. It can be used for remote control of the on / off states of oil, gas, and water pipeline systems in hydropower stations. It is commonly used in clamping, control, and lubrication circuits. There are direct-acting and pilot-operated types, with the pilot-operated type being more common.

[0003] In 2017, the inventors applied for a series of low-pressure-loss hydraulic valves, namely, application number "201710415237.X" entitled "A Two-Way Hydraulic Valve" and application number "201710417743.2" entitled "A Three-Way Hydraulic Valve". Through several years of application and differential pressure monitoring on test benches, it was found that although the above-mentioned types of hydraulic valves significantly reduce pressure loss compared to ordinary hydraulic valves, they still rely on the stepped area on the outer side of the main valve core to generate pressure to drive the main valve core. The valve core's valve position still needs to contact the oil jet to form a throttling state. Therefore, in some operating conditions, there is still a pressure difference of tens of kilopascals between the inlet and outlet chambers of the hydraulic valve.

[0004] Therefore, there is an urgent need to develop a hydraulic valve assembly that can further reduce pressure loss. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve or alleviate the problem that there is still a pressure difference of tens of kilopascals between the oil inlet chamber and the oil outlet chamber of the hydraulic valve in some working conditions in the prior art.

[0006] This invention provides a hydraulic valve assembly for controlling the connection or disconnection of an oil circuit, the hydraulic valve assembly comprising:

[0007] The main valve body includes a main oil hole and a main valve core hole arranged at an acute angle and communicating with each other. The main oil hole is a straight hole that passes through the main valve body, and the two ends of the main oil hole are used to communicate with the oil circuit.

[0008] The main valve core assembly is inserted into the main valve core hole and has a shaft-type structure. It can move along its axis within the main valve core hole and form a valve seal structure with the main valve core hole.

[0009] The control cylinder is located above the end face of the main valve core hole of the main valve body;

[0010] A control piston, which is mounted in the main valve core assembly and extends into the interior of the control cylinder together with the main valve core assembly; and

[0011] A guide assembly is disposed above the control cylinder and the control cylinder is press-fitted onto the main valve body by fasteners. The guide assembly is used to control the movement direction of the main valve core assembly to form different working states.

[0012] The main valve core assembly, the control cylinder, the control piston, and the guide assembly are configured to use external high-pressure oil to push the control piston to open the main valve core assembly.

[0013] In the preferred embodiment of the above-mentioned hydraulic valve assembly, a valve sealing ring of the main valve body is provided at the intersection of the main valve core hole and the main oil hole. The right and left sides of the main valve core hole in the main valve body are respectively provided with the first oil passage and the second oil passage. The first oil passage and the second oil passage are both parallel to the main valve core hole and connected to the main oil hole.

[0014] In the preferred embodiment of the above-mentioned hydraulic valve assembly, the main valve core assembly includes:

[0015] The main valve core has a valve stem end at one end and a shaft end at the other end. The shaft end mates with the main valve core bore. The shaft end has a valve thread sealing ring that matches the valve thread sealing ring of the main valve body. The main valve core has an axial blind hole that passes through the valve stem end and extends into the shaft end. A radial oil hole is located at the junction of the valve stem end and the shaft end, communicating with the blind hole.

[0016] The main valve core return spring is installed in the blind hole and abuts against the guide assembly and the main valve core. When the main valve core return spring is in the extended state, the main valve core is sealed at the valve sealing ring of the main valve body. The main valve core divides the main oil hole into a first oil chamber and a second oil chamber.

[0017] In the preferred embodiment of the above-mentioned hydraulic valve assembly, the control piston is fixed to the valve stem end of the main valve core by a retaining ring.

[0018] In the preferred embodiment of the above-mentioned hydraulic valve assembly, a sealing ring is provided between the control piston and the control cylinder, and a sealing ring is provided between the control cylinder and the main valve core.

[0019] In the preferred embodiment of the above-mentioned hydraulic valve assembly, the control cylinder is provided with an axially penetrating piston chamber. The left and right sides of the piston chamber are provided with a third oil passage, a fourth oil passage, and a fifth oil passage parallel to the piston chamber. The third oil passage is a blind hole, and the fourth and fifth oil passages are through holes and correspondingly connect to the second oil passage and the first oil passage. The control cylinder is also provided with a radial sixth oil passage, which is connected to the third oil passage and also connected to the piston chamber.

[0020] In the preferred embodiment of the above-mentioned hydraulic valve assembly, the guide component includes:

[0021] The pilot valve body has an axially through valve core hole, and a seventh oil passage, a first through hole, a second through hole, a third through hole and a fourth through hole perpendicular to the valve core hole. The first through hole is connected to the third oil passage, the second through hole is connected to the fourth oil passage, the third through hole is connected to the piston chamber, and the fourth through hole is connected to the fifth oil passage.

[0022] A pilot valve core, wherein a first valve wall, a second valve wall, a third valve wall, and a fourth valve wall are provided from one end to the other in its middle portion; the first valve wall and the second valve wall correspond to the first through hole, and the third valve wall and the fourth valve wall correspond to the third through hole; and

[0023] The pilot valve core return spring abuts against one end of the pilot valve core.

[0024] In the preferred embodiment of the above hydraulic valve assembly, the guide component further includes a two-position three-way solenoid directional valve, which has a left port, a middle port and a right port. The left port is connected to the oil tank, the middle port is connected to the end of the guide valve body near the first valve wall, and the right port is connected to high-pressure oil.

[0025] In the preferred embodiment of the above-mentioned hydraulic valve assembly, the working state includes a closed state, the two-position three-way solenoid directional valve is energized, the pilot valve core is normally positioned on the left side of the pilot valve body by the pilot valve core return spring, and the main valve core is moved down by the control cylinder and the control piston, so that the valve sealing ring of the main valve core seals with the valve sealing ring of the main valve body, thus isolating the main oil hole into the first oil chamber and the second oil chamber.

[0026] In the preferred embodiment of the above-mentioned hydraulic valve assembly, the working state includes the open state, the two-position three-way solenoid directional valve is in the de-energized state, the pilot valve core return spring is compressed so that the pilot valve core is located on the right side of the pilot valve body, and the main valve core is moved up to the fully open state by the control cylinder and the control piston.

[0027] When the above technical solution is adopted, the hydraulic valve assembly of the present invention includes a main valve body, a main valve core assembly, a control cylinder, a control piston, and a guide assembly. A control cylinder and a control piston are added to the upper part of the main valve core assembly. The main valve core assembly, the control cylinder, the control piston, and the guide assembly cooperate with each other to form an assembly in which the control piston is driven by external high-pressure oil to open the main valve core assembly. After verification on the test bench, the present invention eliminates the residual pressure difference. Attached Figure Description

[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0029] Figure 1 This is a schematic structural diagram of the main valve body of a hydraulic valve assembly in a fully closed state according to an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 A schematic structural diagram of a two-position three-way solenoid directional valve in the energized state.

[0031] Figure 3 yes Figure 1 A schematic structural diagram of the pilot valve body and pilot valve core;

[0032] Figure 4 This is a schematic structural diagram of the main valve body of a hydraulic valve assembly in the fully open state according to an embodiment of the present invention.

[0033] Figure 5 yes Figure 4 A schematic diagram of the two-position three-way solenoid directional valve in the de-energized state.

[0034] Figure 6 yes Figure 4 A schematic structural diagram of the pilot valve body and pilot valve core.

[0035] 1. Main valve body; 12. Main valve core hole; 13. Main oil hole; A. First oil chamber; B. Second oil chamber; D. First oil passage; E. First control oil chamber; N. Second oil passage; P. Valve sealing ring of main valve body.

[0036] 2. Main valve core, 21. Valve stem end, 22. Shaft end, 23. Blind hole, F. Oil hole, Q. Valve thread sealing ring of the main valve core.

[0037] 3. Main valve core return spring,

[0038] 4. Control cylinder, C. Second control oil chamber, I. Third oil circuit, J. Third control oil chamber, K. Fourth oil circuit, M. Fifth oil circuit, L. Sixth oil circuit.

[0039] 5. Control the piston.

[0040] 6. Pilot valve body, G. Seventh oil passage, H. Fourth control oil chamber, 61. First through hole, 62. Second through hole, 63. Third through hole, 64. Fourth through hole.

[0041] 7. Pilot valve core; 71. First valve wall; 72. Second valve wall; 73. Third valve wall; 74. Fourth valve wall.

[0042] 8-pipe valve core return spring,

[0043] 9-axis elastic retaining ring,

[0044] 10 sealing rings,

[0045] 11 Two-position three-way solenoid directional valve, 111 middle right valve wall, 112 middle left valve wall. Detailed Implementation

[0046] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications.

[0047] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] To address or alleviate the problem of a pressure difference of tens of kilopascals between the inlet and outlet chambers of hydraulic valves in certain operating conditions in existing technologies, the inventors, after several years of exploration and practice, have innovatively developed a hydraulic valve assembly that can further reduce pressure loss. This invention not only innovates the pilot valve function but also changes the structure of existing hydraulic valve assemblies and the geometry of the main valve core. The invention adds a piston rod to the upper part of the main valve core and adds a control cylinder and a control piston, using external high-pressure oil to push the control piston to open the main valve core.

[0050] Figure 1 This is a schematic structural diagram of the main valve body of a hydraulic valve assembly in a fully closed state according to an embodiment of the present invention. Figure 4 This is a schematic structural diagram of the main valve body of a hydraulic valve assembly in the fully open state according to an embodiment of the present invention. Figure 1 As shown, see also Figure 4 The present invention discloses a hydraulic valve assembly for controlling the connection or disconnection of an oil circuit. The hydraulic valve assembly generally includes: a main valve body 1, a main valve core assembly (generally including a main valve core 2 and a main valve core return spring 3), a control cylinder 4, a control piston 5, and a guide assembly (generally including a guide valve body 6, a guide valve core 7, and a guide valve core return spring 8). The main valve body 1 includes a main oil port 13 and a main valve core port 12 arranged at an acute angle and communicating with each other (see...). Figure 4 The main oil hole 13 is a straight hole that passes through the main valve body 1, and both ends of the main oil hole 13 are used to communicate with the oil circuit. The main valve core assembly is inserted into the main valve core hole 12. The main valve core assembly has a shaft-type structure and can move along its own axis within the main valve core hole 12, forming a valve seal structure with the main valve core hole 12. The control cylinder 4 is located above the end face of the main valve body 1 where the main valve core hole 12 is located. The control piston 5 is installed in the main valve core assembly and extends into the interior of the control cylinder 4 together with the main valve core assembly. The guide assembly is located above the control cylinder 4. The guide assembly presses the control cylinder 4 onto the main valve body 1 with fasteners. The guide assembly is used to control the movement direction of the main valve core assembly to form different working states. In specific implementation, the control cylinder 4 can be press-fitted onto the end face of the main valve body 1 with the valve core hole 12 by the guide valve body 6 with fixing bolts. The main valve core assembly, control cylinder 4, control piston 5, and guide assembly work together to use external high-pressure oil to push the control piston 5 to open the main valve core assembly.

[0051] When adopting the above technical solution, the hydraulic valve assembly of the present invention includes a main valve body 1, a main valve core assembly, a control cylinder 4, a control piston 5, and a guide assembly. The control cylinder 4 and the control piston 5 are added to the upper part of the main valve core assembly. The main valve core assembly, the control cylinder 4, the control piston 5, and the guide assembly cooperate with each other to use external high-pressure oil to push the control piston 5 to open the main valve core assembly. After verification on the test bench, the present invention eliminates the remaining pressure difference and solves or alleviates the problem of pressure difference between the oil inlet chamber and the oil outlet chamber of the hydraulic valve in some working conditions in the prior art.

[0052] As one possible implementation method, such as Figure 1 As shown, see also Figure 4 The intersection of the main valve core hole 12 and the main oil hole 13 is provided with a valve sealing ring P of the main valve body (see...). Figure 4The main valve core hole 12 in the main valve body 1 is provided with the first oil passage D and the second oil passage N on the right and left sides respectively. The first oil passage D and the second oil passage N are both parallel to the main valve core hole 12 and connected to the main oil hole 13.

[0053] As one possible implementation method, such as Figure 1 As shown, see also Figure 4 The main valve core assembly generally includes: a main valve core 2 and a main valve core return spring 3. One end of the main valve core 2 is a valve stem end 21. The other end of the main valve core 2 is a shaft end 22, which mates with the main valve core bore 12. The end of the shaft end 22 is provided with a valve thread sealing ring Q of the main valve core. The valve thread sealing ring Q of the main valve core and the valve thread sealing ring P of the main valve body (see...) Figure 4 The main valve core 2 is axially provided with a blind hole 23, which passes through the valve stem end 21 and extends into the shaft end 22. A radial oil hole F is provided at the junction of the valve stem end 21 and the shaft end 22, communicating with the blind hole 23. The main valve core return spring 3 is installed in the blind hole 23 and abuts against the guide assembly and the main valve core 2. When the main valve core return spring 3 is in the extended state, the main valve core 2 is sealed to the valve seal ring P of the main valve body, and the main valve core 2 divides the main oil hole 13 into a first oil chamber A and a second oil chamber B. When the main valve core return spring 3 is in the retracted state, the main valve core 2 is open.

[0054] As one possible implementation method, such as Figure 1 As shown, see also Figure 4 The control piston 5 is fixed to the valve stem end 21 of the main valve core 2 by a retaining ring. In specific implementation, the end of the valve stem end 21 of the main valve core 2 can be fixed to the control piston 5 by a axial elastic retaining ring 9.

[0055] As one possible implementation method, such as Figure 1 As shown, see also Figure 4 A sealing ring 10 is provided between the control piston 5 and the control cylinder 4, and a sealing ring 10 is provided between the control cylinder 4 and the main valve core 2. In specific implementation, both the control piston 5 and the control cylinder 4 are provided with sealing ring grooves, and the sealing ring 10 is installed in the sealing ring grooves of the control piston 5 and the control cylinder 4 respectively.

[0056] As one possible implementation method, such as Figure 1 As shown, see also Figure 4 The control cylinder 4 has an axially penetrating piston chamber, which is divided into a second control chamber C and a third control chamber J according to the different lower and upper positions of the control piston 5 (see...). Figure 4The piston chamber has a third oil passage I, a fourth oil passage K, and a fifth oil passage M parallel to the piston chamber on its left and right sides. The third oil passage I is a blind hole, while the fourth oil passage K and the fifth oil passage M are through holes and correspondingly connect to the second oil passage N and the first oil passage D. The control cylinder 4 also has a radial sixth oil passage L, which communicates with the third oil passage I and is also connected to the piston chamber.

[0057] As one possible implementation method, such as Figure 1 As shown, see also Figure 4 The guiding assembly generally includes: a valve body 6, a valve core 7, and a valve core return spring 8. The valve body 6 has an axially penetrating valve core bore, and a seventh oil passage G, a first through hole 61, a second through hole 62, a third through hole 63, and a fourth through hole 64 perpendicular to the valve core bore. The first through hole 61 communicates with the third oil passage I, the second through hole 62 communicates with the fourth oil passage K, the third through hole 63 communicates with the piston chamber, and the fourth through hole 64 communicates with the fifth oil passage M. The valve core 7 has a first valve wall 71, a second valve wall 72, a third valve wall 73, and a fourth valve wall 74 located in the middle section from one end to the other (from left to right). The first valve wall 71 and the second valve wall 72 correspond to the first through hole 61, and the third valve wall 73 and the fourth valve wall 74 correspond to the third through hole 63. The valve core return spring 8 abuts against one end of the valve core 7 (the right end). The pilot valve core 7 is inserted into the valve core hole of the pilot valve body 6 and is normally positioned on the left side of the pilot valve body 6 by the pilot valve core return spring 8.

[0058] Figure 2 yes Figure 1 A schematic diagram of the two-position three-way solenoid valve in the energized state. Figure 5 yes Figure 4 A schematic structural diagram of a two-position three-way solenoid directional valve in the de-energized state. As one possible implementation, such as... Figure 2 As shown, see also Figure 1 , Figure 4 and Figure 5 The guide assembly also includes a two-position three-way solenoid directional valve 11, which has a left port, a middle port and a right port (defined as the left, middle and right directions according to the direction shown in the drawing). The left port is connected to the oil tank, the middle port is connected to the end of the valve body 6 near the first valve wall 71, i.e., the fourth control oil chamber H, and the right port is connected to high-pressure oil.

[0059] Figure 3 yes Figure 1 A schematic structural diagram of the pilot valve body and pilot valve core. As one possible implementation, such as... Figure 1 As shown, the working state includes the off state, such as... Figure 2 As shown, the two-position three-way solenoid directional valve 11 is in the energized state, as... Figure 3As shown, the pilot valve core 7 is normally positioned on the left side of the pilot valve body 6 by the pilot valve core return spring 8, as... Figure 1 As shown, by controlling the oil cylinder 4 and the control piston 5, the main valve core 2 is moved down, so that the valve sealing ring Q of the main valve core seals with the valve sealing ring P of the main valve body, thus isolating the main oil hole 13 into the first oil chamber A and the second oil chamber B.

[0060] The specific working process in the closed state:

[0061] like Figure 2 As shown, since the two-position three-way solenoid directional valve 11 is energized, the valve core of the two-position three-way solenoid directional valve 11 is located on the right side of the valve body due to the thrust of the electromagnetic armature. At this time, high-pressure oil enters the right oil chamber of the two-position three-way solenoid directional valve 11 through the pipeline and is blocked by the right valve wall 111 in the middle of the valve core. Meanwhile, the left valve wall 112 in the middle of the valve core opens a gap relative to the valve body. The hydraulic oil from the fourth control oil chamber H of the pilot valve body 6 flows back to the oil tank through this gap. Figure 3 As shown, simultaneously, the pilot valve core return spring 8 pushes the pilot valve core 7 to the left to the position... Figure 3 The position shown makes the second valve wall 72 and the fourth valve wall 74 of the pilot valve core 7 open up two gaps on the left and right sides relative to the pilot valve body 6.

[0062] like Figure 1 As shown, the high-pressure oil flowing through the first oil chamber A in the main valve body 1 of the pilot valve body 6 passes through the first oil passage D and the fifth oil passage M, and through the fourth through hole 64 of the pilot valve body 6. It enters the second control oil chamber C through the gap on the right side of the fourth valve wall 74 of the pilot valve core 7 via the third through hole 63. It then enters the first control oil chamber E through the blind hole 23 and the oil hole F of the main valve core 2, applying downward pressure to the main valve core 2. This causes the valve sealing ring Q of the main valve core to adhere to the valve sealing ring P of the main valve body, sealing the hydraulic oil flowing from the first oil chamber A to the second oil chamber B in the main valve body 1.

[0063] Meanwhile, the third control oil chamber J (see...) Figure 4 The hydraulic oil inside flows through the sixth oil passage L and the third oil passage I, then through the gap on the right side of the second valve wall 72 of the internal pilot valve core 7 of the pilot valve body 6, and then through the fourth oil passage K into the second oil passage N of the main valve body 1 to the second oil chamber B.

[0064] Figure 6 yes Figure 4 A schematic structural diagram of the pilot valve body and pilot valve core. As one possible implementation, such as... Figure 4 As shown, the working status includes the on state, such as... Figure 5 As shown, the two-position three-way solenoid directional valve 11 is in the de-energized state, as... Figure 6 The pilot valve core return spring 8 is compressed, causing the pilot valve core 7 to be located on the right side of the pilot valve body 6, as shown. Figure 1 As shown, by controlling the hydraulic cylinder 4 and the control piston 5, the main valve core 2 is moved upward to the fully open state.

[0065] The working process in the fully powered-on state:

[0066] like Figure 5 As shown, since the two-position three-way solenoid directional valve 11 is in the de-energized state, the valve core of the two-position three-way solenoid directional valve 11 is located on the left side of the valve body due to the thrust of the spring. At this time, high-pressure oil flows through the pipeline into the right oil chamber of the two-position three-way solenoid directional valve 11, and then passes through the gap formed between the right valve wall 111 in the middle of the valve core and the valve body, as shown. Figure 6 As shown, the fourth control oil chamber H of the pilot valve body 6 pushes the pilot valve core 7 to compress the pilot valve core return spring 8, which moves to the right to the position shown. Figure 6 The displayed location, such as Figure 6 As shown, this causes the first valve wall 71 and the third valve wall 73 of the pilot valve core 7 to have two gaps on the left and right sides relative to the pilot valve body 6.

[0067] like Figure 4 As shown, high-pressure oil passes through the seventh oil passage G on the left side of the pilot valve body 6, through the gap on the left side of the first valve wall 71 of the pilot valve body 6, and then through the first through hole 61, the third oil passage I, and the sixth oil passage L into the third control oil chamber J, pushing the control piston 5 to drive the main valve core 2 upward. At the same time, the high-pressure oil in the first oil chamber A in the main valve body 1 passes through the first oil passage D, the fifth oil passage M, and the fourth through hole 64 into the pilot valve body 6, and is then cut off by the fourth valve wall 74 of the pilot valve core 7. The high-pressure oil from the second control oil chamber C (see...) Figure 1 ) and the first control oil chamber E (see Figure 1 The hydraulic oil flows through oil hole F (see...) Figure 1 ) and the blind hole 23 of the main valve core 2 (see Figure 1 After passing through the third through hole 63 and the left gap of the third valve wall 73 of the pilot valve core 7, it then passes through the second through hole 62, the fourth oil passage K, and the second oil passage N to enter the second oil chamber B of the main valve body 1, causing the main valve core 2 to move upward to the position shown in the image. Figure 4 The fully open state is shown.

[0068] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A hydraulic valve assembly, characterized in that, The hydraulic valve assembly, used to control the connection or disconnection of oil circuits, includes: The main valve body (1) includes a main oil hole (13) arranged at an acute angle and interconnected with a main valve core hole (12). The main oil hole (13) is a straight hole that passes through the main valve body (1). The two ends of the main oil hole (13) are used to communicate with the oil circuit. The main valve core assembly is inserted into the main valve core hole (12), and has a shaft-type structure. It can move along its axis within the main valve core hole (12) and form a valve line sealing structure with the main valve core hole (12). The control cylinder (4) is located above the end face of the main valve core hole (12) of the main valve body (1); The control piston (5) is mounted in the main valve core assembly and extends into the interior of the control cylinder (4) together with the main valve core assembly; and A guide assembly is disposed above the control cylinder (4) and the control cylinder (4) is press-fitted onto the main valve body (1) by fasteners. The guide assembly is used to control the movement direction of the main valve core assembly to form different working states. The main valve core assembly, the control cylinder (4), the control piston (5), and the guide assembly cooperate to use external high-pressure oil to push the control piston (5) to open the main valve core assembly.

2. The hydraulic valve assembly according to claim 1, characterized in that, The main valve core hole (12) and the main oil hole (13) are provided with a valve sealing ring (P) of the main valve body. The main valve core hole (1) in the main valve body (1) is provided with a first oil passage (D) and a second oil passage (N) on the right and left sides respectively. The first oil passage (D) and the second oil passage (N) are both parallel to the main valve core hole (12) and connected to the main oil hole (13).

3. The hydraulic valve assembly according to claim 2, characterized in that, The main valve core assembly includes: The main valve core (2) has a valve stem end (21) at one end and a shaft end (22) at the other end. The shaft end (22) is matched with the main valve core hole (12). The end of the shaft end (22) is provided with a valve thread sealing ring (Q) of the main valve core. The valve thread sealing ring (Q) of the main valve core matches the valve thread sealing ring (P) of the main valve body. The main valve core (2) has a blind hole (23) in its axial direction. The blind hole (23) passes through the valve stem end (21) and extends into the shaft end (22). A radial oil hole (F) is provided at the joint position of the valve stem end (21) and the shaft end (22). The oil hole (F) communicates with the blind hole (23). The main valve core return spring (3) is installed in the blind hole (23) and abuts against the guide assembly and the main valve core (2). When the main valve core return spring (3) is in the extended state, the main valve core (2) is sealed at the valve sealing ring (P) of the main valve body. The main valve core (2) divides the main oil hole (13) into a first oil chamber (A) and a second oil chamber (B).

4. The hydraulic valve assembly according to claim 3, characterized in that, The control piston (5) is fixed to the valve stem end (21) of the main valve core (2) by a retaining ring.

5. The hydraulic valve assembly according to claim 4, characterized in that, A sealing ring (10) is provided between the control piston (5) and the control cylinder (4), and a sealing ring (10) is provided between the control cylinder (4) and the main valve core (2).

6. The hydraulic valve assembly according to claim 5, characterized in that, The control cylinder (4) is provided with an axially penetrating piston chamber. The left and right sides of the piston chamber are provided with a third oil passage (I), a fourth oil passage (k), and a fifth oil passage (M) parallel to the piston chamber. The third oil passage (I) is a blind hole, and the fourth oil passage (k) and the fifth oil passage (M) are through holes and are correspondingly connected to the second oil passage (N) and the first oil passage (D). The control cylinder (4) is also provided with a radial sixth oil passage (L). The sixth oil passage (L) is connected to the third oil passage (I) and is also connected to the piston chamber.

7. The hydraulic valve assembly according to claim 6, characterized in that, The guiding component includes: The pilot valve body (6) has an axially penetrating valve core hole, and a seventh oil passage (G), a first through hole (61), a second through hole (62), a third through hole (63) and a fourth through hole (64) perpendicular to the valve core hole. The first through hole (61) is connected to the third oil passage (I), the second through hole (62) is connected to the fourth oil passage (K), the third through hole (63) is connected to the piston chamber, and the fourth through hole (64) is connected to the fifth oil passage (M). A pilot valve core (7) has a central portion comprising a first valve wall (71), a second valve wall (72), a third valve wall (73), and a fourth valve wall (74) extending from one end to the other. The first valve wall (71) and the second valve wall (72) correspond to the first through hole (61), and the third valve wall (73) and the fourth valve wall (74) correspond to the third through hole (63). The valve core return spring (8) abuts against one end of the valve core (7).

8. The hydraulic valve assembly according to claim 7, characterized in that, The guiding assembly also includes a two-position three-way solenoid directional valve (11), which has a left port, a middle port and a right port. The left port is connected to the oil tank, the middle port is connected to the end of the valve body (6) near the first valve wall (71), and the right port is connected to high-pressure oil.

9. The hydraulic valve assembly according to claim 8, characterized in that, The working state includes the closed state, the two-position three-way solenoid directional valve (11) is in the energized state, the pilot valve core (7) is normally positioned on the left side of the pilot valve body (6) by the pilot valve core return spring (8), the main valve core (2) is driven to move down by the control cylinder (4) and the control piston (5), so that the valve sealing ring (Q) of the main valve core seals with the valve sealing ring (P) of the main valve body, and the main oil hole (13) is isolated into the first oil chamber (A) and the second oil chamber (B).

10. The hydraulic valve assembly according to claim 9, characterized in that, The working state includes the open state, the two-position three-way solenoid directional valve (11) is in the de-energized state, the pilot valve core return spring (8) is compressed so that the pilot valve core (7) is located on the right side of the pilot valve body (6), and the main valve core (2) is moved up to the fully open state by the control cylinder (4) and the control piston (5).

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