Multifunctional valve

Abstract

The utility model belongs to the technical field of hydraulic valves, and discloses a multifunctional valve. The multifunctional valve comprises a valve seat assembly, a first valve element and an elastic assembly. The valve seat assembly is provided with an oil inlet hole, a first oil return hole and a valve port, the valve port is communicated with the oil inlet hole and the first oil return hole, the first valve element is slidably arranged in the valve seat assembly and comprises a valve element section and a supporting section which are integrally formed, the valve element section can open or close the valve port, and the supporting section is arranged at the end, away from the valve port, of the valve element section. The elastic assembly is contained in the valve seat assembly, and one end of the elastic assembly abuts against the supporting section. The first valve element can be directly clamped in the grinding machining procedure, and the machining difficulty is lowered; the supporting section and the valve element section are integrally formed, so that a complicated coaxial connection structure is avoided, and the machining difficulty of the first valve element is reduced; the supporting section can provide effective supporting for the elastic assembly, and it is ensured that the elastic assembly cannot incline into the inner hole of the valve seat assembly in the assembling process.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic valve technical field especially relates to a multifunctional valve. BACKGROUND

[0002] At present, the multifunctional valve commonly used in market, such as Figure 1 As shown, usually adopts split type's valve core subassembly, and valve core subassembly includes valve core 1' and spring seat 2', so that the disassembly of multifunctional valve is more convenient, and spring seat 2' can be mass-produced and applied to various valve bodies. However, the valve core 1' has no effective clamping position in the grinding process after heat treatment, so when producing the valve core 1', it is necessary to additionally add a clamping part, which is removed after grinding is completed, resulting in high processing difficulty and cost of the valve core 1'; in order to ensure that the spring seat 2' and the valve core 1' can be coaxially connected, a concave round structure is usually provided on the spring seat 2' to cooperate with the convex round structure of the valve core 1', and the processing difficulty of the spring seat 2' is great; in the assembly process, since the spring seat 2' and the valve core 1' are not hard connected, the spring 3' may be inclined in the inner hole of the main valve seat after being assembled, causing assembly difficulty.

[0003] Therefore, it is necessary to provide a multifunctional valve to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a multifunctional valve, which can be directly clamped in the grinding process, has low processing difficulty, simple assembly and high precision.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A multifunctional valve, comprising:

[0007] A valve seat assembly having an oil inlet hole, a first oil return hole and a valve port, the valve port communicating the oil inlet hole and the first oil return hole;

[0008] A first valve core slidably arranged in the valve seat assembly, the first valve core comprising an integrally formed valve core segment and a support segment, the valve core segment being capable of opening or closing the valve port, and the support segment being arranged at an end of the valve core segment away from the valve port;

[0009] An elastic assembly accommodated in the valve seat assembly, one end of the elastic assembly abutting against the support segment.

[0010] Preferably, the outer periphery of the support segment is square or polygonal, and the outer periphery of the support segment has a first oil passing gap with the inner wall of the valve seat assembly.

[0011] As preferred, one side of the support section towards the valve port has an inner concave flow guide surface, which guides the hydraulic oil flowing into the valve port to the first oil return hole.

[0012] As preferred, the valve core section comprises a sliding part and a sealing part, the sliding part is inserted into the valve port, and a second oil passing gap exists between the sliding part and the valve port, the outer peripheral surface of the sealing part is a tapered surface, which can abut against the valve seat assembly to close the valve port.

[0013] As preferred, the first valve core further comprises:

[0014] A guide section is arranged at the other end of the valve core section, and the guide section is in sliding guide cooperation with the valve port.

[0015] As preferred, the first valve core further comprises:

[0016] A positioning section is arranged at the side of the support section away from the valve core section, and the positioning section can position and support the elastic assembly.

[0017] As preferred, the valve seat assembly comprises:

[0018] A main valve seat and a first valve seat, the first valve seat is arranged at one end of the main valve seat, the oil inlet hole and the valve port are arranged on the first valve seat, and the first oil return hole is arranged on the main valve seat.

[0019] As preferred, the multifunctional valve further comprises:

[0020] A second valve seat is arranged at one end of the valve seat assembly having the valve port, and the second valve seat has a communicated oil inlet and a second oil return hole;

[0021] A valve core assembly is slidably arranged in the second valve seat, and the valve core assembly is penetrated by an oil passing channel, the oil passing channel communicates the oil inlet and the oil inlet hole, and the valve core assembly can make the oil inlet and the second oil return hole communicate or disconnect;

[0022] A second elastic member, one end of the second elastic member abuts against the valve core assembly, and the other end abuts against the valve seat assembly.

[0023] As preferred, the valve core assembly comprises:

[0024] A second valve core and a third valve core, the third valve core is sleeved on the outer periphery of the second valve core, and hydraulic oil can flow from the second oil return hole to the third valve core to push the valve core assembly to slide, so that the oil inlet and the second oil return hole are communicated.

[0025] As preferred, the multifunctional valve further comprises:

[0026] A blocking assembly is arranged at one end of the valve seat assembly away from the oil inlet hole, and the other end of the elastic assembly abuts against the blocking assembly.

[0027] The utility model discloses beneficial effects of:

[0028] The multifunctional valve comprises a valve seat assembly, a first valve core and an elastic assembly. The valve seat assembly is provided with an oil inlet hole, a first oil return hole and a valve port. The valve port is connected with the oil inlet hole and the first oil return hole. The first valve core is slidably arranged in the valve seat assembly. The first valve core comprises a valve core section and a supporting section which are integrally formed. The valve core section can open or close the valve port. The supporting section is arranged at one end of the valve core section away from the valve port. The elastic assembly is accommodated in the valve seat assembly. One end of the elastic assembly abuts against the supporting section.

[0029] Hydraulic oil can flow into the valve port from the oil inlet hole of the valve seat assembly. The hydraulic oil can provide a pushing force for the right movement of the first valve core. When the pressure of the hydraulic system exceeds the preset pressure, the pushing force is greater than the pre-tightening force of the elastic assembly. The hydraulic oil pushes the first valve core to move left to open the valve port. The hydraulic oil flows from the valve port to the first oil return hole and then returns to the oil tank through the first oil return hole until the pressure of the hydraulic system decreases to the preset pressure. The first valve core is reset to close the valve port under the pre-tightening force of the elastic assembly.

[0030] The first valve core of the multifunctional valve comprises a valve core section and a supporting section which are integrally arranged. The valve core section can open or close the valve port to dynamically maintain the stable pressure of the hydraulic system. The supporting section can provide stable support for the elastic assembly, and the spring seat in the conventional arrangement is omitted. Due to the presence of the supporting section, the first valve core can be directly clamped in the grinding process after heat treatment without the need for additional clamping parts, thereby reducing the processing difficulty and production cost. The supporting section and the valve core section are integrally formed, avoiding the complex coaxial connection structure between the spring seat and the first valve core in the conventional arrangement, reducing the processing difficulty of the first valve core, and improving the assembly accuracy and reliability. Since the supporting section and the valve core section are integrally arranged, the supporting section can provide effective support for the elastic assembly, ensuring that the elastic assembly will not be inclined in the inner hole of the valve seat assembly during assembly, and avoiding the assembly difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of a multifunctional valve in the prior art;

[0032] Figure 2 is a structural schematic diagram of a multifunctional valve provided by the utility model;

[0033] Figure 3 is a sectional view of a first valve core provided by the utility model;

[0034] Figure 4 is a side view of the first valve core provided by the utility model.

[0035] In the drawings:

[0036] 1', valve core; 2', spring seat; 3', spring;

[0037] 1, valve seat assembly; 11, oil inlet hole; 12, first oil return hole; 13, valve port; 14, main valve seat; 15, first valve seat;

[0038] 2, first valve core; 21, valve core section; 211, sliding part; 2111, second oil passing gap; 212, sealing part; 2121, conical surface; 22, support section; 221, first oil passing gap; 222, concave flow guiding surface; 23, guiding section; 24, positioning section;

[0039] 3, elastic assembly; 31, support seat; 32, first elastic member;

[0040] 4, second valve seat; 41, oil inlet; 42, second oil return hole;

[0041] 5, valve core assembly; 51, oil passing channel; 52, second valve core; 53, third valve core;

[0042] 6, second elastic member;

[0043] 7, plugging assembly; 71, screw sleeve; 72, locking screw; 73, locking cap. DETAILED DESCRIPTION

[0044] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings and not all structures.

[0045] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0046] In the present utility model, unless otherwise expressly provided and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them.

[0047] In the description of the present embodiment, the terms "upper", "lower", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0048] At present, the commonly used multifunctional valve in the market, such as Figure 1 As shown, a split type valve core assembly is usually used, which includes a valve core 1' and a spring seat 2', so that the disassembly of the multifunctional valve is more convenient, and the spring seat 2' can be mass produced and applied to various valve bodies. However, at this time, the valve core 1' has no effective clamping position in the grinding process after heat treatment, so when the valve core 1' is produced, an additional clamping part needs to be added, which is removed after grinding is completed, causing the valve core 1' to have high processing difficulty and high cost; in order to ensure that the spring seat 2' and the valve core 1' can be coaxially connected, a concave circular structure is usually provided on the spring seat 2' to cooperate with the convex circular structure of the valve core 1', so that the processing difficulty of the spring seat 2' is high; during assembly, since the spring seat 2' and the valve core 1' are not hard connected, after the spring 3' is installed, the spring 3' may be inclined in the inner hole of the main valve seat, causing assembly difficulty.

[0049] To solve the above problems, as Figures 2-4 As shown, the present embodiment provides a multifunctional valve, which comprises a valve seat assembly 1, a first valve core 2 and an elastic assembly 3. The valve seat assembly 1 has an oil inlet hole 11, a first oil return hole 12 and a valve port 13, the valve port 13 communicates the oil inlet hole 11 and the first oil return hole 12, the first valve core 2 is slidably arranged in the valve seat assembly 1, the first valve core 2 comprises an integrally formed valve core section 21 and a support section 22, the valve core section 21 can open or close the valve port 13, the support section 22 is arranged at one end of the valve core section 21 away from the valve port 13, the elastic assembly 3 is accommodated in the valve seat assembly 1, and one end of the elastic assembly 3 abuts against the support section 22.

[0050] The hydraulic oil can flow into the valve port 13 from the oil inlet hole 11 of the valve seat assembly 1, the hydraulic oil can provide a pushing force for the right movement of the first valve core 2, when the pressure of the hydraulic system exceeds the preset pressure, the pushing force is greater than the pre-tightening force of the elastic assembly 3, the hydraulic oil pushes the first valve core 2 to move left to open the valve port 13, the hydraulic oil flows from the valve port 13 to the first oil return hole 12 and returns to the oil tank through the first oil return hole 12, until the pressure of the hydraulic system decreases to the preset pressure, the first valve core 2 is reset to close the valve port 13 under the pre-tightening force of the elastic assembly 3.

[0051] The first valve core 2 of the multifunctional valve includes a valve core section 21 and a support section 22 which are integrally formed, the valve core section 21 can open or close the valve port 13 to dynamically maintain the stable pressure of the hydraulic system, and the support section 22 can provide stable support for the elastic assembly 3, and the spring seat 2' in the conventional arrangement is omitted. Due to the presence of the support section 22, the first valve core 2 can be directly clamped in the grinding process after heat treatment without the need for additional clamping parts, thereby reducing the processing difficulty and production cost; the support section 22 and the valve core section 21 are integrally formed, avoiding the complex coaxial connection structure between the spring seat 2' and the valve core 1' in the conventional arrangement, reducing the processing difficulty of the first valve core 2, and improving the assembly accuracy and reliability; due to the integral formation of the support section 22 and the valve core section 21, the support section 22 can provide effective support for the elastic assembly 3, ensuring that the elastic assembly 3 will not be inclined in the inner hole of the valve seat assembly 1 during assembly, avoiding the problem of difficult assembly.

[0052] Specifically, as shown in Figures 2-4 , the outer periphery of the support section 22 is square or polygonal, and the outer periphery of the support section 22 and the inner wall of the valve seat assembly 1 have a first oil passing gap 221. It can be understood that the hydraulic oil in the inner cavity of the valve seat assembly 1 needs to flow to the first oil return hole 12 through the first oil passing gap 221 to flow out of the multifunctional valve. The outer periphery of the spring seat in the prior art is circular, in order to enable the hydraulic oil in the inner cavity of the valve seat assembly 1 to smoothly flow out through the first oil passing gap 221, the outer periphery of the spring seat cannot be too large, and by setting the outer periphery of the support section 22 as square or polygonal, the effective support area of the support section 22 for the elastic assembly 3 is larger under the condition that the size of the first oil passing gap 221 is unchanged. It can be understood that under the condition that the first oil passing gap 221 is the same, the outer periphery circle of the spring seat with a circular outer periphery is an inscribed circle of the outer periphery of the support section 22 with a square or polygonal outer periphery, that is, the effective support area of the spring seat is smaller than that of the support section 22.

[0053] Specifically, as shown in Figure 2 , Figure 3As shown, the support section 22 has an inner concave flow guide surface 222 on the side facing the valve port 13, which guides the hydraulic oil flowing into the valve port 13 to the first oil return hole 12. The hydraulic oil flowing out of the valve port 13 impacts on the inner concave flow guide surface 222, and after being guided by the inner concave flow guide surface 222, the hydraulic oil can flow smoothly to the first oil return hole 12, thereby avoiding the hydraulic oil flowing into the valve seat assembly 1 impacting the elastic assembly 3, causing the elastic assembly 3 to drive the first spool 2 to vibrate, so as to better reduce the impact noise.

[0054] In this embodiment, as shown in Figure 2 , Figure 3 The spool section 21 includes a sliding part 211 and a sealing part 212. The sliding part 211 is inserted into the valve port 13, and a second oil passing gap 2111 exists between the sliding part 211 and the valve port 13. The outer peripheral surface of the sealing part 212 is a tapered surface 2121, which can abut against the valve seat assembly 1 to close the valve port 13. The hydraulic oil enters the valve port 13 from the oil inlet hole 11, passes through the second oil passing gap 2111 to the tapered surface 2121 to generate a thrust on the tapered surface 2121. When the pressure of the hydraulic oil is greater than the pre-tightening force of the elastic assembly 3, the hydraulic oil pushes the first spool 2 to open the valve port 13. When the pressure of the hydraulic system decreases to below the preset pressure, the first spool 2 is reset under the pre-tightening force of the elastic assembly 3, and the tapered surface 2121 abuts against the valve seat assembly 1 again to close the valve port 13. That is, the tapered surface 2121 of the first spool 2 cooperates with the valve seat assembly 1 to realize the closing and opening of the valve port 13.

[0055] Specifically, as shown in Figure 2 , Figure 3 The first spool 2 further includes a guide section 23, which is arranged at the other end of the spool section 21 and is in sliding guide cooperation with the valve port 13. The sliding guide cooperation between the guide section 23 and the valve port 13 can ensure the stability of the first spool 2 during movement, which helps to prevent the first spool 2 from shaking or deviating during the opening or closing of the valve port 13, and ensures the reliability of the multifunctional valve.

[0056] Specifically, as shown in Figure 2 , Figure 3 The first spool 2 further includes a positioning section 24, which is arranged at the end of the support section 22 away from the spool section 21 and can position the elastic assembly 3. The positioning section 24 can prevent the elastic assembly 3 from being displaced or deformed during extension and contraction, and ensure its reliability.

[0057] Specifically, as shown in Figure 2As shown, the valve seat assembly 1 includes a main valve seat 14 and a first valve seat 15, the first valve seat 15 is arranged at one end of the main valve seat 14, the first valve seat 15 is provided with the oil inlet hole 11 and the valve port 13, and the main valve seat 14 is provided with the first oil return hole 12. By dividing the valve seat assembly 1 into two parts, the main valve seat 14 and the first valve seat 15, the structure of the entire valve seat assembly 1 is simpler, which helps to reduce the complexity of design and manufacturing, improve production efficiency; because the first valve core 2 reciprocates along the valve port 13 during operation, causing greater wear, at this time, only the first valve seat 15 needs to be replaced, without replacing the entire valve seat assembly 1, which can reduce maintenance costs.

[0058] As shown in the Figure 2 The multifunctional valve also includes a plugging assembly 7, at least part of the plugging assembly 7 is arranged at one end of the valve seat assembly 1 away from the oil inlet hole 11, and the other end of the elastic assembly 3 abuts against the plugging assembly 7.

[0059] Specifically, as shown in the Figure 2 The plugging assembly 7 includes a threaded sleeve 71, a locking screw 72 and a locking cap 73, the threaded sleeve 71 is threadedly connected with the valve seat assembly 1, the locking screw 72 is threadedly connected with the threaded sleeve, and the locking cap 73 is threadedly connected with the locking screw 72. The elastic assembly 3 abuts against the locking screw 72.

[0060] In this embodiment, as shown in the Figure 2 The elastic assembly 3 includes a support seat 31 and a first elastic member 32, the support seat 31 is arranged at the other end of the first elastic member 32, and the support seat 31 abuts against the plugging assembly 7. The support seat 31 can provide stable support for the first elastic member 32, ensuring the reliability of the first elastic member 32.

[0061] Specifically, as shown in the Figure 2 The multifunctional valve also includes a second valve seat 4, a valve core assembly 5 and a second elastic member 6, the second valve seat 4 is arranged at one end of the valve seat assembly 1 having the valve port 13, and the second valve seat 4 has a communicating oil inlet port 41 and a second oil return hole 42; the valve core assembly 5 is slidably arranged in the second valve seat 4, the valve core assembly 5 is provided with an oil passing channel 51, the oil passing channel 51 communicates the oil inlet port 41 and the oil inlet hole 11, and the valve core assembly 5 can make the oil inlet port 41 communicate with or disconnect from the second oil return hole 42; one end of the second elastic member 6 abuts against the valve core assembly 5, and the other end of the second elastic member 6 abuts against the valve seat assembly 1.

[0062] The hydraulic oil flows into the oil passage 51 from the oil inlet 41, and then flows into the oil inlet hole 11, and flows into the valve port 13 through the oil inlet hole 11, and the hydraulic oil pressure acts on the first valve core 2, when the pressure of the hydraulic system is greater than the preset pressure, the hydraulic oil pushes the first valve core 2 to move leftward against the pre-tightening force of the elastic assembly 3, the hydraulic oil flows to the first oil return hole 12 and flows back to the oil tank, so that the pressure of the hydraulic system is ensured not to be too large, when the pressure of the hydraulic system is stepped up, the hydraulic oil pushes the valve core assembly 5 to move leftward to make the oil inlet 41 communicate with the second oil return hole 42, the hydraulic oil flows from the oil inlet 41 to the second oil return hole 42 and flows back to the oil tank, to assist the overflow of the first oil return hole 12, to play a protection role when the pressure of the hydraulic system is stepped up.

[0063] Specifically, as shown in the figure, Figure 2 The valve core assembly 5 comprises a second valve core 52 and a third valve core 53, the third valve core 53 is sleeved on the outer periphery of the second valve core 52, and the hydraulic oil can flow to the third valve core 53 from the second oil return hole 42 to push the valve core assembly 5 to slide, so that the oil inlet 41 communicates with the second oil return hole 42. When the hydraulic oil pressure at the oil inlet 41 is less than the hydraulic oil pressure at the second oil return hole 42, and the pressure difference reaches a set value, the hydraulic oil at the second oil return hole 42 pushes the third valve core 53 to make the valve core assembly 5 slide leftward, and then make the oil inlet 41 communicate with the second oil return hole 42, at this time, the oil supplement function of the multifunctional valve is opened, and the hydraulic oil flows back to the oil inlet 41 from the second oil return hole 42.

[0064] In the embodiment, the second valve core 52 is a conical valve core, which can realize conical sealing with the second valve seat 4 to disconnect the oil inlet 41 and the second oil return hole 42, and the third valve core 53 is a sliding valve core.

[0065] Obviously, the above-mentioned embodiments of the utility model are only for clear illustration of the utility model, and are not limited to the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A multifunctional valve characterized by, The utility model relates to a valve seat assembly (1) with an oil inlet hole (11), a first oil return hole (12) and a valve port (13) communicating the oil inlet hole (11) and the first oil return hole (12), a first valve core (2) slidably arranged in the valve seat assembly (1), the first valve core (2) comprising an integrally formed valve core section (21) capable of opening or closing the valve port (13) and a support section (22) arranged at one end of the valve core section (21) away from the valve port (13), and an elastic assembly (3) housed in the valve seat assembly (1), one end of the elastic assembly (3) abutting against the support section (22). The outer periphery of the support section (22) is square or polygonal, and a first oil passing gap (221) is formed between the outer periphery of the support section (22) and the inner wall of the valve seat assembly (1). One side of the support section (22) towards the valve port (13) has an inwardly recessed flow guide surface (222) for guiding the hydraulic oil flowing into the valve port (13) to the first oil return hole (12). The valve core section (21) comprises a sliding part (211) inserted into the valve port (13) with a second oil passing gap (2111) between the sliding part (211) and the valve port (13), and a sealing part (212) with a conical outer surface (2121) capable of abutting against the valve seat assembly (1) to close the valve port (13).

2. The multifunctional valve according to claim 1, characterized in that The first valve core (2) further comprises a guide section (23) arranged at the other end of the valve core section (21) and slidably guided by the valve port (13).

3. The multifunctional valve according to claim 1, wherein The first valve core (2) further comprises a positioning section (24) arranged at one side of the support section (22) away from the valve core section (21) and capable of positioning and supporting the elastic assembly (3).

4. The multifunctional valve according to claim 1, wherein The valve seat assembly (1) comprises a main valve seat (14) and a first valve seat (15) arranged at one end of the main valve seat (14), the first valve seat (15) having the oil inlet hole (11) and the valve port (13) formed therein, and the main valve seat (14) having the first oil return hole (12) formed therein.

5. The multifunctional valve according to claim 1, wherein The multifunctional valve further comprises a second valve seat (4) arranged at one end of the valve seat assembly (1) having the valve port (13), the second valve seat (4) having a communicating oil inlet port (41) and a second oil return hole (42). ​ 6. The multifunctional valve of claim 1, wherein ​ ​ 7. The multifunctional valve of claim 1, wherein ​ ​ 8. The multifunctional valve according to any one of claims 1-7, characterized in that ​ ​ A valve core assembly (5) is slidably arranged in the second valve seat (4), and the valve core assembly (5) is provided with an oil passing channel (51) penetrating through the valve core assembly (5), the oil passing channel (51) is communicated with the oil inlet (41) and the oil inlet hole (11), and the valve core assembly (5) can make the oil inlet (41) communicated with or disconnected from the second oil return hole (42); A second elastic member (6) is arranged, one end of the second elastic member (6) is abutted with the valve core assembly (5), and the other end is abutted with the valve seat assembly (1).

9. The multifunctional valve according to claim 8, characterized in that The valve core assembly (5) comprises: A second valve core (52) and a third valve core (53), the third valve core (53) is sleeved on the outer periphery of the second valve core (52), and hydraulic oil can flow from the second oil return hole (42) to the third valve core (53) to push the valve core assembly (5) to slide, so that the oil inlet (41) is communicated with the second oil return hole (42).

10. The multifunctional valve according to any one of claims 1-7, wherein, The multifunctional valve further comprises: A blocking assembly (7) is arranged, at least part of the blocking assembly (7) is arranged at one end of the valve seat assembly (1) away from the oil inlet hole (11), and the other end of the elastic assembly (3) is abutted with the blocking assembly (7).

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