A valve device

Abstract

A valve device includes a main valve body, a main spool, and a regeneration valve. The main valve body is provided with an oil inlet cavity communicating with an oil port A. The regeneration valve includes a regeneration spool and a regeneration check valve. The outer wall of the regeneration spool penetrates through a regeneration throttle hole, and an oil return throttle groove is formed on the outer wall of the regeneration spool. A main valve body step is provided at the position of the main valve body corresponding to the oil return throttle groove and the regeneration throttle hole. The valve device has a regeneration state and a regeneration release state. In the regeneration state, a part of the oil fluid flows into the T oil port through the oil return throttle groove, and another part of the oil fluid pushes open the regeneration check valve through the regeneration throttle hole and flows into the oil port P. In the regeneration release state, the regeneration throttle hole is completely blocked and closed by the main valve body step, and the opening of the oil return throttle groove is in the fully open state at most. The valve device of the present invention can synchronously release flow regeneration and oil return throttling according to the pressure of the oil port P, reducing energy loss.

Description

Technical Field

[0001] The invention relates to a valve device, in particular to a multi-way valve used in a control element involved in the field of engineering machinery. Background Art

[0002] Multi-way valves are important control components widely used in the field of engineering machinery. Engineering machinery has many branches, such as walking machinery, mining machinery, concrete machinery and various types of construction machinery.

[0003] Existing flow regeneration valves all have some problems: (1) Flow regeneration only exists between the A and B oil ports of the same working device and cannot be regenerated to other working devices; (2) The return oil throttling area cannot be automatically adjusted according to the P port pressure, resulting in a high return oil back pressure and increased energy consumption. Summary of the invention

[0004] In view of this, the present invention provides a valve device, in particular, a multi-way valve used in a control element involved in the field of engineering machinery. The valve device described in this patent is a flow regeneration and cut-off control device in a multi-way valve. The potential energy generated by the weight of the working device is converted into hydraulic energy according to the working conditions. This patent makes full use of the hydraulic energy and releases the flow regeneration according to the working conditions.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A valve device comprises a main valve body and a main valve core. The main valve body is provided with an oil port P, an oil port A, an oil port B and an oil inlet cavity connected to the oil port A. The oil port P is connected to the oil port B. The valve device also comprises a regeneration valve arranged in the main valve body. The regeneration valve comprises a regeneration valve core and a regeneration one-way valve arranged in the regeneration valve core. A regeneration throttling hole is arranged through the outer wall of the regeneration valve core, and an oil return throttling groove is arranged on the outer wall of the regeneration valve core along the moving direction of the regeneration valve core. A main valve body step is arranged at the position of the main valve body corresponding to the oil return throttling groove and the regeneration throttling hole. The main valve body is provided with a pilot port Pa and a pilot port Pb, an oil passage, an oil return port T and a cavity. The cavity is connected to the oil port A, and the oil passage is connected to the return port. The oil port T is located on both sides of the main valve body step, the main valve core is located between the cavity and the oil channel, the pilot port Pa and the pilot port Pb are arranged on both sides of the main valve core, and the valve device has a regeneration state and a regeneration release state. In the regeneration state, the oil entering from the pilot port Pa or the pilot port Pb controls the movement of the main valve core so that the main valve core opens and connects the oil channel and the cavity. A part of the oil flows into the T oil port through the return oil throttling groove, and the other part of the oil pushes the regeneration check valve through the regeneration throttling hole and flows into the oil port P. In the regeneration release state, the regeneration valve moves to the right due to the high pressure of the oil port P, and the regeneration throttling hole is completely blocked and closed by the main valve body step, and the flow area of ​​the return oil throttling groove is at its maximum and is in a fully open state.

[0007] Preferably, the regeneration valve further includes a B plug and a return spring. The plug is fixed relative to the main valve body. The plug has a regeneration valve limiting step for limiting the movement of the regeneration valve core. The regeneration valve core is provided with a regeneration valve return spring positioning step, and the return spring is pressed between the plug and the regeneration valve return spring positioning step.

[0008] Preferably, a regeneration valve cavity is formed inside the regeneration valve core. The regeneration check valve includes a check valve plug, a snap ring, a spring, and a check valve core. The snap ring axially positions the check valve plug. Both ends of the spring are pressed and limited by the check valve plug and the check valve core. The regeneration throttle hole communicates with the regeneration valve cavity. The inner wall of the regeneration valve core has a check valve limiting step. When the valve device is in the regeneration state, the regeneration check valve core disengages from the check valve limiting step and the check valve conducts. When the valve device is in the regeneration release state, the regeneration check valve moves under the high pressure of the oil port P and closes.

[0009] Preferably, the main valve body is provided with a regeneration valve cavity, and the regeneration valve cavity communicates with the oil port P through a communication oil passage opened in the main valve body.

[0010] Preferably, when the valve device is in the regeneration state, the regeneration throttle hole and the main valve body step are axially misaligned, and the main valve body step does not block the regeneration throttle hole.

[0011] Preferably, the regeneration valve core is provided with an oil drain hole, and the oil drain hole communicates the regeneration valve cavity with the oil return port T.

[0012] Preferably, the oil drain hole includes a first oil drain passage axially opened along the regeneration valve core and a second oil drain passage radially penetrating the regeneration valve core. One end of the first oil drain passage is directly communicated with the regeneration valve cavity, and the other end is communicated with the second oil drain passage. The second oil drain passage is communicated with the oil return port T.

[0013] Preferably, the oil drain hole communicates with the oil return port T in both the regeneration state and the regeneration release state.

[0014] Preferably, a plurality of regeneration throttle holes are provided and are arranged axially staggered along the regeneration valve, and the aperture sizes of the respective regeneration throttle holes are not equal.

[0015] Preferably, the extending direction of the oil return throttle groove is perpendicular to the center line of the regeneration throttle hole. When the opening of the oil return throttle groove increases, the opening of the regeneration throttle hole decreases, and when the opening of the oil return throttle groove decreases, the opening of the regeneration throttle hole increases.

[0016] The beneficial effects of the present invention are as follows: the valve device described in the present invention can release flow regeneration according to the working conditions and reduce energy loss; the technical solution described in the present invention can solve the optimization design of some parts to reduce the space of the multi-way valve and reduce product costs. Specifically, the valve device described in the present invention can automatically complete energy recovery according to the working conditions, and the recovered energy is connected in parallel with the main oil circuit P port to drive the remaining working devices, reducing energy consumption and effectively improving the working efficiency of the compound action; the valve device described in the present invention connects the regeneration flow and the main oil circuit P port in parallel to achieve flow regeneration across working devices; the return oil throttling is controlled by the pressure of the P port, and the return oil throttling is also synchronously released when the flow regeneration is released, and the return oil back pressure is small, which improves the energy utilization rate. The flow regeneration can be automatically released according to the P port pressure, and the return oil throttling is also synchronously released when the regeneration is released, thereby ensuring a lower return oil pressure, further reducing the return oil loss, reducing energy consumption, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Attached Figure 1 This is a schematic diagram of the oil passage arrangement when the valve device is fully open for regeneration;

[0019] Attached Figure 2 The schematic diagram of the regeneration valve is shown in the attached Figure 1 The valve device shown is in the state of regeneration fully open;

[0020] Attached Figure 3 It is a schematic diagram of the oil passage arrangement when the valve device is released from regeneration;

[0021] Attached Figure 4 The schematic diagram of the regeneration valve is shown in the attached Figure 3 The state of the valve device shown when regeneration is released;

[0022] Attached Figure 5 For along Figure 4 Cross-sectional view along the AA direction.

[0023] Reference numerals:

[0024] 1 Valve body; 2 Main spool; 3 Oil inlet cavity connected to check valve; 4 Oil inlet cavity connected to oil inlet port; 5 Check valve; 6 Relief valve; 8 Connecting oil passage; 10 Regenerative valve installation cavity; 11 Oil passage; 12 Return oil port T; 13 Regenerative valve; 14 Cavity; 101 Flow regenerative valve spool; 102 Regenerative check valve; 103 Regenerative check valve spring; 104 Check valve plug; 105 Snap ring; 106 Regenerative valve cavity; 107 Regenerative throttle orifice; 108 Return oil throttle groove; 109 Drain hole; 110 Regenerative valve return spring; 111 Plug B; 112 Regenerative valve limit step; 113 Main valve body step; 114 Regenerative valve return spring positioning step; 115 Check valve spool; 116 Limit step; 117 First drain passage; 118 Second drain passage; 119 Regenerative valve limit step; 120 Regenerative valve return spring positioning step; P oil port; A oil inlet port; B oil outlet port; Pa, Pb pilot ports. Detailed implementation manner

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] The present invention will be further described below with reference to the accompanying drawings of the specification.

[0027] The present invention provides the following technical solutions:

[0028] A valve device, as shown in the attached Figures 1-5As shown in the figure, it includes a main valve body 1 and a main spool 2. The main valve body 1 is provided with an oil port P, an oil port A, an oil port B, and an oil inlet cavity 4 communicating with the oil port A. The oil port P is communicated with the oil port B. The valve device further includes a check valve 5, a relief valve 6, and a regenerative valve 13 arranged in the main valve body 1. The regenerative valve 13 includes a regenerative spool 101 and a regenerative check valve 102 arranged in the regenerative spool 101. A regenerative throttle hole 107 is penetrated through the outer wall of the regenerative spool 101, and an oil return throttle groove 108 is formed along the moving direction of the regenerative spool 101 on the outer wall of the regenerative spool 101. A main valve body step 113 is arranged at the position of the main valve body 1 corresponding to the oil return throttle groove 108 and the regenerative throttle hole 107. The main valve body 1 is provided with a pilot port Pa, a pilot port Pb, an oil passage 11, an oil return port T12, and a cavity 14. The oil inlet port P, the pilot port Pa, and the pilot port Pb are connected to an external hydraulic source, and the hydraulic source can be a hydraulic valve, a hydraulic pump, etc. The cavity 14 is communicated with the oil port A. The oil passage 11 and the oil return port T12 are located on both sides of the main valve body step 113. The main spool 2 is located between the cavity 14 and the oil passage 11. The pilot port Pa and the pilot port Pb are arranged on both sides of the main spool 2. The pilot port Pa and the pilot port Pb are connected to an external pilot oil source, and the function is to control the main spool to change direction.

[0029] The valve device has a regenerative state and a regenerative release state. In the regenerative state, the oil fluid entering from the pilot port Pa or the pilot port Pb controls the movement of the main spool, so that the main spool 2 is opened, and then the oil passage 11 and the cavity 14 are communicated. A part of the oil fluid flows into the T oil port 12 through the oil return throttle groove 108, and another part of the oil fluid pushes open the regenerative check valve through the regenerative throttle hole and flows into the oil port P. The hydraulic oil flowing into the oil port P enters the oil passage 7 through the main spool 2 and finally flows to the oil port B. The oil port B is usually connected to a load. In the regenerative release state, the regenerative valve 13 moves to the right under the action of the high pressure of the oil port P. The regenerative throttle hole 107 is completely blocked and closed by the main valve body step 113, and the flow area of the oil return throttle groove is the largest and in the fully open state. At this time, the oil fluid flowing in from the oil port A cannot be regenerated to the P port. The regenerative valve further includes a plug B111 and a return spring 110. The plug B111 is fixed relative to the main valve body 1. The plug B111 has a regenerative valve limit step 119 for limiting the movement of the regenerative spool. The regenerative spool 101 is provided with a regenerative valve return spring positioning step 120. The return spring 110 is compressed between the plug B111 and the regenerative valve return spring positioning step 120.

[0030] The check valve 5 is a pilot-operated check valve, which is arranged in the cavity 14 to control the communication between the oil port A and the spool 2. The relief valve 6 is a safety valve, which is communicated with the oil port A. When the pressure at the oil port A is too high, overflow protection is carried out through the relief valve 6.

[0031] Specifically, a regeneration valve cavity 106 is formed inside the regeneration valve core 101, and the regeneration one-way valve 102 includes a one-way valve plug 104, a retaining spring 105, a spring 103, and a one-way valve core 115. The retaining spring 105 positions the one-way valve plug 104 axially, and both ends of the spring 103 are compressed and limited by the one-way valve plug 104 and the one-way valve core 115. The regeneration throttling hole 107 is connected to the regeneration valve cavity 106, and the inner wall of the regeneration valve core has a one-way valve limiting step 116. When the valve device is in the regeneration state, the regeneration one-way valve core 115 disengages from the limiting step 116 and the one-way valve is turned on. When the valve device is in the regeneration release state, the regeneration one-way valve 102 is moved and closed by the high pressure of the oil port P.

[0032] Specifically, an oil return throttling groove 108 is arranged on the outside of the regeneration valve core 101, and a regeneration throttling hole 107 is passed through the side wall. Both ends are hollow, and a regeneration check valve 102 is arranged at one end (the left end in the figure). The regeneration check valve 102 is reset by a regeneration check valve spring 103. The regeneration check valve spring 103 is positioned by a check valve plug 104. The check valve plug 104 is axially positioned by a retaining spring 105. An oil drain hole 109 is arranged at one end (the right end in the figure). The oil drain hole 109 is communicated with the T oil port 12. One end of the regeneration valve reset spring 110 acts on the reset spring positioning step 114 at one end of the regeneration valve core (the right end in the figure), and the other side directly acts on the plug B 111. The opening sizes of the return oil throttling groove 108 and the regeneration throttling hole 107 are both controlled by the valve body boss 113, and when the opening of the return oil throttling groove 108 increases, the opening of the regeneration throttling hole 107 decreases, and when the opening of the return oil throttling groove 108 decreases, the opening of the regeneration throttling hole 107 increases. When the valve device is working, an oil cylinder is connected between the oil port P and the oil port A, and the hydraulic oil is pumped from the oil port P into the oil cylinder through the external oil pump and then enters the valve device through the oil port A.

[0033] Specifically, the main valve body 1 is provided with a regeneration valve installation cavity 10, and the regeneration valve installation cavity 10 is connected with the oil port P through a connecting oil passage 8 provided in the main valve body 1. When the valve device is in a regeneration state, the regeneration throttle hole 107 and the main valve body step 113 are axially misaligned, and the main valve body step 113 does not block the regeneration throttle hole 107.

[0034] Specifically, the regenerative spool 101 is provided with an oil drain hole 109, and the oil drain hole 109 communicates the regenerative valve cavity 106 with the oil return port T12. The oil drain hole 109 includes a first oil drain passage 117 axially opened along the regenerative spool 101 and a second oil drain passage 118 radially penetrating through the regenerative spool 101. One end of the first oil drain passage 117 is directly communicated with one end of the regenerative valve cavity 106 close to the plug B111, and the other end is communicated with the second oil drain passage 118. The second oil drain passage 118 is communicated with the oil return port T12. The oil drain hole 109 can discharge the hydraulic oil remaining in the regenerative valve cavity 106.

[0035] Reference appendix Figure 2 , 4 , in both the regenerative state and the regenerative release state, the oil drain hole 109 is communicated with the oil return port T12. In the regenerative state, the second oil drain passage 118 is opposite to and communicated with the left end of the oil return port T12. In the regenerative release state, the second oil drain passage 118 is opposite to and communicated with the right end of the oil return port T12. When the pressure of P increases, the regenerative valve 13 moves to the right against the force of the spring 110, and the oil trapped in the spring chamber is drained back to the oil return port T12 through the oil drain hole 109.

[0036] Furthermore, in Figure 2 as can be seen from the fully opened schematic diagram of the regenerative state shown, in this embodiment, a plurality of regenerative throttle holes 107 are provided and arranged staggeredly along the axis of the regenerative valve, and the aperture sizes of the respective throttle holes are different. Specifically, the aperture of the staggeredly arranged regenerative throttle holes 107 gradually decreases along the axis of the regenerative spool. Specifically, when the regenerative valve 13 moves to the right against the force of the spring 110, the valve body shoulder 113 first shields the regenerative throttle hole 107 with the smallest aperture, and then successively shields the apertures of the regenerative throttle holes 107 with gradually increasing apertures. After arranging the regenerative throttle holes 107 in this way, the structure is more compact and convenient for arrangement. At the same time, this setting form with different sizes can fit a linear flow area, so that the passing flow rate changes uniformly.

[0037] For the valve device of the present invention, when the opening of the oil return throttle groove 108 increases, the opening of the regenerative throttle hole 107 decreases, and when the opening of the oil return throttle groove 108 decreases, the opening of the regenerative throttle hole 107 increases.

[0038] The working principle of the valve device of the present invention is as follows: When the pilot port Pb supplies oil, the spool 2 moves to the right, the cavity 14 is connected to the cavity 11, and the hydraulic oil entering the cavity 11 from the oil port A is divided into two parts. One part passes through the regenerative throttle orifice 107 on the regenerative valve and enters the cavity 106 of the regenerative valve, pushes open the check valve 102 and then enters the P port through the oil passage 8 to form regenerative hydraulic oil, providing additional flow for the system and realizing energy regeneration; the other part enters the T oil port 12 through the oil return throttle groove 108 on the regenerative valve 13. Since the left end cavity 10 of the regenerative valve is connected to the P port, the left end of the regenerative valve is always under the pressure of P. When the pressure of P increases, the regenerative valve 13 will move to the right against the force of the spring 110, and the oil trapped in the spring cavity is drained back to the T oil port 12 through the drain hole 109. During the rightward movement of the regenerative valve 13, the area of the regenerative throttle orifice 107 will gradually decrease, and the area of the oil return throttle groove 108 will gradually increase until the regenerative valve is pushed to the limit position and stops under the mechanical limit of the step 112. At this time, the regenerative throttle orifice 107 is completely closed by the shielding of the step 113 (i.e., the flow regeneration is released), and the oil return throttle groove 108 is in the fully open state (i.e., the oil return throttle is released and the back pressure disappears). The valve device can automatically release the flow regeneration according to the pressure of the P port, and at the same time, the oil return throttling is also released synchronously, thus ensuring a lower oil return pressure, further reducing the oil return loss, reducing energy consumption, and improving work efficiency. When the pressure of the P port of the regenerative valve of the present invention is relatively low, the oil at the oil port A can be regenerated to the P port for energy recovery, and the oil return energy at the oil port A is recovered to the P port as the power for the remaining working devices. When the pressure of the P port increases, the regeneration function is cut off, and the oil return back pressure is also released, reducing the oil return back pressure and energy consumption. Similarly, when the pilot port Pa supplies oil, the spool 2 moves to the left, and the flow regeneration and regeneration release can also be realized. The principle is the same as when the pilot Pb supplies oil, and will not be elaborated here.

[0039] Specific application examples of the present invention: Taking an excavator's excavation operation as an example, the boom linkage realizes the commutation of the boom linkage working position by providing left and right pilot pressures, provides hydraulic energy for the large and small chambers of the boom cylinder (load ports A and B, load port A is oil port A, and load port B is oil port B), and then realizes the lifting and lowering movements of the excavator's boom. When the boom descends, the small chamber of the cylinder (oil port B) is filled with oil, and the large chamber of the cylinder (oil port A) returns oil. At this time, the descending rate of the boom is adjusted by the oil return throttle groove on the regenerative valve (oil return speed regulation). Due to the oil return throttling, the gravitational potential energy of the boom will be mainly converted into the pressure potential energy of the large chamber (load port A). Since the pressure in the large chamber (load port A) is higher than the pressure at port P, a part of the oil will flow from the large chamber (load port A) into port P through the regenerative valve. The oil at port P can flow into the small chamber of the cylinder (load port B) or into other working devices (such as the bucket), thus completing the recovery and utilization of energy. When the boom descends to the position and the excavator starts the excavation operation, the excavator needs to exert force, and the pressure at port P (pump output pressure) increases, pushing the regenerative valve core to move to the right, the regeneration is cut off, and the oil return throttling is released.

[0040] In order to reduce energy consumption and realize the function of cutting off the regeneration function and relieving the oil return back pressure at the same time, the regenerative valve core 101 is set as a hollow structure, the regenerative throttle hole is located on the side wall of the regenerative valve core, and an oil return throttle groove 108 is arranged outside, and the opening areas of both are controlled by the shoulder on the valve body.

[0041] In order to facilitate the realization of energy regeneration, the extending direction of the oil return throttle groove 108 is perpendicular to the center line of the regenerative throttle hole 107. When the opening of the oil return throttle groove 108 increases, the opening of the regenerative throttle hole 107 decreases; when the opening of the oil return throttle groove 108 decreases, the opening of the regenerative throttle hole 107 increases.

[0042] The present invention discloses that professionals in the art can implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A valve device, comprising a main valve body (1) and a main spool (2), wherein the main valve body (1) is provided with an oil port P, an oil port A, an oil port B, and an oil inlet cavity (4) communicating with the oil port A, and the oil port P is communicated with the oil port B, characterized in that: The valve device further includes a regeneration valve (13) disposed within the main valve body (1). The regeneration valve (13) includes a regeneration valve core (101) and a regeneration check valve (102) disposed within the regeneration valve core (101). A regeneration throttle orifice (107) is disposed through the outer wall of the regeneration valve core (101), and an oil return throttle groove (108) is formed along the moving direction of the regeneration valve core (101) on the outer wall of the regeneration valve core (101). A main valve body step (113) is provided at the position of the main valve body (1) corresponding to the oil return throttle groove (108) and the regeneration throttle orifice (107). The main valve body (1) is provided with a pilot port Pa, a pilot port Pb, an oil passage (11), an oil return port T (12), and a cavity (14). The cavity (14) is in communication with the oil port A. The oil passage (11) and the oil return port T (12) are located on both sides of the main valve body step (113). The main valve core (2) is located between the cavity (14) and the oil passage (11). The pilot port Pa and the pilot port Pb are provided on both sides of the main valve core (2). The valve device has a regeneration state and a regeneration release state. In the regeneration state, the oil fluid entering from the pilot port Pa or the pilot port Pb controls the movement of the main valve core (2) to open the main valve core (2), thereby connecting the oil passage (11) and the cavity (14). A part of the oil fluid flows into the oil return port T (12) through the oil return throttle groove (108), and another part of the oil fluid pushes open the regeneration check valve (102) through the regeneration throttle orifice (107) and flows into the oil port P. In the regeneration release state, the regeneration valve (13) moves to the right under the high pressure of the oil port P. The regeneration throttle orifice (107) is completely blocked and closed by the main valve body step (113), and the opening of the oil return throttle groove (108) is the largest, being in a fully open state. A regeneration valve cavity (106) is formed inside the regeneration valve core (101). The regeneration check valve (102) includes a check valve plug (104), a circlip (105), a spring (103), and a check valve core (115). The circlip (105) axially positions the check valve plug (104). Both ends of the spring (103) are pressed and limited by the check valve plug (104) and the check valve core (115). The regeneration throttle orifice (107) is in communication with the regeneration valve cavity (106). The inner wall of the regeneration valve core (101) has a check valve limit step (116). When the valve device is in the regeneration state, the regeneration check valve core (115) disengages from the check valve limit step (116) to conduct. When the valve device is in the regeneration release state, the regeneration check valve (102) moves under the high pressure of the oil port P and closes.

2. The valve device according to claim 1, characterized in that: The regeneration valve further includes a B plug (111) and a return spring (110). The plug (111) is fixed relative to the main valve body (1). The plug (111) has a regeneration valve limit step (119) for limiting the movement of the regeneration valve core. The regeneration valve core (101) is provided with a regeneration valve return spring positioning step (120). The return spring (110) is pressed between the plug (111) and the regeneration valve return spring positioning step (120).

3. The valve device according to claim 1, characterized in that: The main valve body (1) is provided with a regeneration valve installation cavity (10), and the regeneration valve installation cavity (10) is communicated with the oil port P through a communication oil passage (8) opened in the main valve body (1).

4. The valve device according to claim 1, characterized in that: When the valve device is in the regeneration state, the regeneration throttle orifice (107) is axially misaligned with the main valve body step (113), and the main valve body step (113) does not block the regeneration throttle orifice (107).

5. The valve device according to claim 1, characterized in that: The regeneration valve core (101) is provided with an oil drain hole (109), and the oil drain hole (109) communicates the regeneration valve cavity (106) with the oil return port T (12).

6. The valve device according to claim 5, characterized in that: The oil drain hole (109) includes a first oil drain passage (117) axially opened along the regeneration valve core (101) and a second oil drain passage (118) radially penetrating along the regeneration valve core (101). One end of the first oil drain passage (117) is directly communicated with the regeneration valve cavity (106), the other end is communicated with the second oil drain passage (118), and the second oil drain passage (118) is communicated with the oil return port T (12).

7. The valve device according to claim 5, characterized in that: In the regeneration state and the regeneration release state, the oil drain hole (109) is communicated with the oil return port T (12).

8. The valve device according to claim 1, characterized in that: A plurality of the regeneration throttle orifices (107) are provided and are arranged axially staggered along the regeneration valve, and the aperture sizes of the respective regeneration throttle orifices (107) are not equal.

9. The valve device according to claim 1, characterized in that: The extending direction of the oil return throttle groove (108) is perpendicular to the center line of the regeneration throttle orifice (107). When the opening of the oil return throttle groove (108) increases, the opening of the regeneration throttle orifice (107) decreases, and when the opening of the oil return throttle groove (108) decreases, the opening of the regeneration throttle orifice (107) increases.

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