Split overflow valve

Abstract

The utility model discloses a split type overflow valve, and belongs to the technical field of overflow valves. The split type overflow valve comprises a first valve seat, a second valve seat and a valve element. The second valve seat is connected to the first valve seat, and a valve port is formed in the second valve seat; the valve element is partially located in the first valve seat and partially arranged in the second valve seat in a sliding fit mode so that the valve element can open or close the valve port. According to the split type overflow valve, the second valve seat and the first valve seat are independently arranged to be two split parts, so that the inner cavity of the first valve seat can be conveniently machined, and the machining precision of the first valve seat is improved; besides, the second valve seat which is in sliding fit with the valve element and collides with the valve element frequently can be independently subjected to overall hard treatment, batch hard treatment on the second valve seat is facilitated, and the problem that the cost is high due to local hard treatment can be avoided; and meanwhile, it can be guaranteed that the first valve seat is not affected when the second valve seat is subjected to overall hard treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of overflow valves, in particular to a split overflow valve. Background Art

[0002] In an overflow valve, the main valve seat usually adopts an integral structure, that is, the main valve seat is integrally formed, so that the length of the main valve seat is relatively long, and the inner cavity of the main valve seat is a deep hole machining, which is likely to cause tool deflection during the deep hole machining, resulting in a large machining error in the coaxiality of the main valve seat, and the machining accuracy of the main valve seat is relatively low.

[0003] Moreover, when the overflow valve is working, there will be sliding friction and frequent collisions between the valve core and the main valve seat. Therefore, it is necessary to harden the part of the main valve seat associated with the valve core to ensure the structural strength of the main valve seat and avoid serious wear of the main valve seat.

[0004] However, if the main valve seat is integrally hardened, the straightness of the entire main valve seat is likely to deteriorate after the integral hardening treatment, thus affecting the working reliability of the main valve seat. Therefore, currently, the main valve seat is usually locally hardened. The local hardening treatment specifically refers to only hardening the part of the main valve seat associated with the valve core, and the cost of the local hardening treatment is relatively high, and batch hardening treatment cannot be carried out.

[0005] Aiming at the above problems, there is an urgent need for a split overflow valve to solve the above problems. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a split overflow valve, which can improve the machining accuracy of the first valve seat, can integrally harden the second valve seat, and can ensure relatively high working reliability of the first valve seat.

[0007] To achieve the above object, the utility model adopts the following technical solutions:

[0008] A split overflow valve, comprising:

[0009] A first valve seat;

[0010] A second valve seat, the second valve seat is connected to the first valve seat, and a valve port is arranged in the second valve seat;

[0011] A valve core, a part of the valve core is located in the first valve seat, and a part of the valve core is slidably matched in the second valve seat to open or close the valve port.

[0012] As an optional solution, the second valve seat includes:

[0013] A first sub-seat, the first sub-seat is connected to the first valve seat;

[0014] A second seat, one end of the first seat away from the first valve seat is connected to the second seat, the valve core is slidably engaged with the first seat, and the valve port is arranged on the second seat.

[0015] As an alternative, a hard layer is provided on the first seat and / or the second seat, and the hardness of the hard layer is greater than that of the first valve seat.

[0016] As an alternative, the hard layer includes a first hard layer and a second hard layer. At least a part of the first hard layer is located on the first seat, and at least a part of the second hard layer is located on the second seat. The hardness of the second hard layer is greater than that of the first hard layer.

[0017] As an alternative, the first valve seat includes a limiting portion. The valve core has a first position and a second position. When the valve core is in the first position, the valve core abuts against the second seat to close the valve port. When the valve core is in the second position, the valve core abuts against the limiting portion.

[0018] As an alternative, the first seat includes a first connecting portion, and the first valve seat further includes a second connecting portion. The first connecting portion and the second connecting portion are press-fitted and connected. Along the radial direction of the valve core, the first connecting portion is farther away from the axis of the valve core than the second connecting portion, and the limiting portion is a part of the second connecting portion.

[0019] As an alternative, the split-type overflow valve further includes:

[0020] An elastic member, sleeved on the valve core and located within the first valve seat, one end of the elastic member abuts against the limiting platform of the valve core;

[0021] A base, slidably sleeved on the valve core and arranged opposite to the limiting platform, the other end of the elastic member abuts against the base;

[0022] A limiting assembly, arranged within the first valve seat and connected to the valve core. The limiting assembly can push against the base to compress the elastic member, so as to push the valve core to move along a first direction close to the valve port. The first direction is the axial direction of the first valve seat and is the direction close to the valve port.

[0023] As an alternative, the limiting assembly includes:

[0024] An adjusting sleeve, arranged within the first valve seat;

[0025] A piston sleeve, at least a part of the piston sleeve is arranged within the adjusting sleeve;

[0026] A buffer piston, wherein a first part of the buffer piston is slidably fitted in the adjusting sleeve, a second part of the buffer piston is slidably fitted in the piston sleeve, and the first part of the buffer piston is sleeved on the outer periphery of the valve core. The buffer piston can push the base along the first direction to compress the elastic member, and the buffer piston can move along the first direction to abut against the adjusting sleeve.

[0027] As an alternative, a first damping hole and a first chamber which are communicated with each other are respectively arranged in the valve core. A second chamber is formed in the buffer piston, and a third chamber is formed between the first part of the buffer piston and the adjusting sleeve. The first chamber, the second chamber and the third chamber are communicated with each other. The oil in the first damping hole can flow along the second direction through the first chamber, the second chamber and the third chamber in sequence to the first wall of the buffer piston. The second direction is opposite to the first direction.

[0028] As an alternative, the adjusting sleeve includes a second wall, and the first wall and the second wall are arranged opposite to each other so that the space between the first wall and the second wall forms the third chamber, and the first wall can move along the first direction to abut against the second wall;

[0029] A through hole is arranged on the second part of the buffer piston so that the oil in the second chamber flows through the through hole to between the third wall of the buffer piston and the piston sleeve. The third wall is arranged opposite to the first wall. The area S1 of the oil acting on the first wall is smaller than the area S2 of the oil acting on the third wall.

[0030] The beneficial effects of the utility model are as follows:

[0031] By connecting the second valve seat to the first valve seat, arranging the valve port in the second valve seat, and making part of the valve core located in the first valve seat and part of the valve core slidably fitted in the second valve seat, the valve port is opened or closed by the movement of the valve core; by independently arranging the second valve seat and the first valve seat as two separate parts, compared with the prior art in which a main valve seat with an integral structure is provided, on the one hand, the setting length of the first valve seat is shortened, which is beneficial to the machining of the inner cavity of the first valve seat, improves the coaxiality of the first valve seat, and thus improves the machining accuracy of the first valve seat; on the other hand, the second valve seat that is slidably fitted with the valve core and frequently collides with the valve core can be integrally hardened, which is beneficial to the batch hardening treatment of the second valve seat, can avoid the problem of high cost caused by local hardening treatment, and can ensure that the first valve seat will not be affected when the second valve seat is integrally hardened, ensuring that the working reliability of the first valve seat is relatively high. Description of the Drawings

[0032] Figure 1It is a schematic structural diagram of the split-type overflow valve provided by the present utility model;

[0033] Figure 2 It is a cross-sectional view of the split-type overflow valve provided by the present utility model;

[0034] Figure 3 It is a schematic structural diagram of the first valve seat provided by the present utility model;

[0035] Figure 4 It is a schematic structural diagram of the second sub-seat provided by the present utility model;

[0036] Figure 5 It is a schematic diagram of the integrated structure of the first sub-seat and the second sub-seat provided by the present utility model;

[0037] Figure 6 It is a schematic diagram of the assembly structure of the elastic member, the valve core, the piston sleeve and the buffer piston provided by the present utility model.

[0038] Explanation of reference numerals:

[0039] 1 - First valve seat; 11 - Limiting part; 12 - Second connecting part; 2 - Second valve seat; 21 - First sub-seat; 211 - First connecting part; 22 - Second sub-seat; 221 - First end; 222 - Second end; 223 - Valve port; 3 - Valve core; 31 - Limiting platform; 32 - First damping hole; 33 - First cavity; 4 - Elastic member; 5 - Base;

[0040] 61 - Adjusting sleeve; 611 - Second wall; 62 - Piston sleeve; 63 - Buffer piston; 631 - First wall; 632 - Third wall; 633 - Second cavity; 635 - Through hole; 636 - Second damping hole; 64 - Third cavity. Detailed implementation manners

[0041] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0042] Any feature disclosed in this specification, unless specifically described, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically described, each feature is only an example of a series of equivalent or similar features. Throughout the specification, the same reference numerals indicate the same elements.

[0043] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present utility model will be further described below with reference to the drawings and through specific implementation manners.

[0044] In this embodiment, a split-type overflow valve is proposed. The split-type overflow valve has a high machining accuracy, can ensure high working reliability, and has a low cost for hard treatment, so as to reduce the cost of the entire split-type overflow valve.

[0045] Specifically, as Figures 1 to 3 shown, the split-type overflow valve includes a first valve seat 1, a second valve seat 2, and a valve core 3. Among them, the second valve seat 2 is connected to the first valve seat 1, and a valve port 223 is provided in the second valve seat 2. A part of the valve core 3 is located in the first valve seat 1, and a part of the valve core 3 is slidably fitted in the second valve seat 2, so that the valve core 3 can open or close the valve port 223 to realize the overflow opening and overflow closing functions of the split-type overflow valve.

[0046] Compared with the prior art, the split-type overflow valve in this embodiment changes the setting method of the first valve seat 1 and the second valve seat 2. By connecting the second valve seat 2 to the first valve seat 1, arranging the valve port 223 in the second valve seat 2, and making a part of the valve core 3 located in the first valve seat 1 and a part of the valve core 3 slidably fitted in the second valve seat 2, the valve port 223 is opened or closed by the movement of the valve core 3. The above-mentioned independent setting of the second valve seat 2 and the first valve seat 1 as two split parts, compared with the prior art of setting a main valve seat with an integral structure, on the one hand, shortens the setting length of the first valve seat 1, which is beneficial to machining the inner cavity of the first valve seat 1, improves the coaxiality of the first valve seat 1, and thus improves the machining accuracy of the first valve seat 1. On the other hand, the second valve seat 2 that is slidably fitted with the valve core 3 and collides frequently with the valve core 3 can be integrally hardened. It is beneficial to batch hard treatment of the second valve seat 2, can avoid the problem of high cost caused by local hard treatment, and can ensure that the overall hard treatment of the second valve seat 2 will not affect the first valve seat 1, ensuring high working reliability of the first valve seat 1.

[0047] Specifically, as Figure 4 and Figure 5 shown, the second valve seat 2 is a split structure or an integral structure. In this embodiment, as Figure 4 shown, the second valve seat 2 is a split structure. In other embodiments, as Figure 5 shown, the second valve seat 2 can also be an integral structure, that is, the second valve seat 2 is a whole machining structure, which can effectively reduce the machining process and assembly process of the second valve seat 2.

[0048] Furthermore, as Figures 1 to 4As shown in the figure, the second valve seat 2 includes a first sub-seat 21 and a second sub-seat 22. One end of the first sub-seat 21 is press-fitted and connected to one end of the first valve seat 1. The other end of the first sub-seat 21, which is away from the first valve seat 1, is connected to the first end 221 of the second sub-seat 22. The second end 222 of the second sub-seat 22 communicates with the external environment. The valve core 3 is slidably matched with the first sub-seat 21, and the valve port 223 is arranged in the second sub-seat 22.

[0049] By providing the first sub-seat 21 and the second sub-seat 22, the length of the second valve seat 2 can be made longer, so that the set length of the first valve seat 1 can be further shortened, which is beneficial to machining the inner cavity of the first valve seat 1 and better improving the machining accuracy of the first valve seat 1. Moreover, the first sub-seat 21 and the second sub-seat 22 can be respectively matched with the valve core 3 to ensure better sliding fit accuracy between the valve core 3 and the second valve seat 2.

[0050] In this embodiment, as Figure 1 and Figure 2 shown, the first sub-seat 21 and the second sub-seat 22 are of a split structure, which is convenient for machining the first sub-seat 21 and the second sub-seat 22 separately, making the machining of the first sub-seat 21 and the second sub-seat 22 relatively simple and convenient, and the machining cost is low.

[0051] Furthermore, a hard layer is provided on the first sub-seat 21 and / or the second sub-seat 22, and the hardness of this hard layer is greater than that of the first valve seat 1. That is, through heat treatment, a hard layer with a hardness greater than that of the first valve seat 1 can be formed on the first sub-seat 21 and / or the second sub-seat 22. On the one hand, batch hard treatment can be carried out on the first sub-seat 21 and / or the second sub-seat 22, which is beneficial to reducing the cost of hard treatment. On the other hand, the structural strength of the first sub-seat 21 and / or the second sub-seat 22 can be ensured to be good, so that the first sub-seat 21 can withstand the sliding friction between it and the valve core 3, and / or the second sub-seat 22 can withstand the frequent collision between it and the valve core 3, thereby improving the working reliability of the second valve seat 2. In this embodiment, hard layers are respectively provided on the first sub-seat 21 and the second sub-seat 22.

[0052] Preferably, the hard layers on the first sub-seat 21 and the second sub-seat 22 can be heat-treated separately to form hard layers on the first sub-seat 21 and the second sub-seat 22 respectively. In other embodiments, the hard layers on the first sub-seat 21 and the second sub-seat 22 can also be heat-treated as a whole. Here, no specific limitation is made.

[0053] Further, the hard layer includes a first hard layer and a second hard layer. At least part of the first hard layer is located in the first sub-seat 21, and at least part of the second hard layer is located in the second sub-seat 22, and the hardness of the second hard layer is greater than that of the first hard layer. Since a valve port 223 is formed in the second sub-seat 22, and the valve core 3 collides frequently with the part of the second sub-seat 22 where the valve port 223 is formed, therefore, in this embodiment, by making the hardness of the second hard layer greater than that of the first hard layer, the durability of the overall structure of the second sub-seat 22 can be improved.

[0054] Specifically, the first valve seat 1, the first sub-seat 21, and the second sub-seat 22 are sequentially riveted and connected. On the one hand, the riveting connection can make the connection method between the first valve seat 1, the first sub-seat 21, and the second sub-seat 22 relatively simple and convenient; on the other hand, the riveting connection can better ensure the coaxiality between the first valve seat 1, the first sub-seat 21, and the second sub-seat 22.

[0055] Specifically, as Figure 2 shown, the first valve seat 1 includes a limiting portion 11, and the limiting portion 11 is arranged close to the limiting platform 31 of the valve core 3. The valve core 3 has a first position and a second position. When the valve core 3 is in the first position, the valve core 3 abuts against the second sub-seat 22 to close the valve port 223; when the valve core 3 is in the second position, the limiting platform 31 of the valve core 3 abuts against the limiting portion 11, so that the valve core 3 cannot continue to move in the direction away from the valve port 223 to open the valve port 223. At this time, the valve core 3 opens the valve port 223 to the maximum extent.

[0056] Further, as Figure 2 shown, the first sub-seat 21 includes a first connecting portion 211, and the first valve seat 1 further includes a second connecting portion 12. The first connecting portion 211 and the second connecting portion 12 are press-fitted and connected. Along the radial direction of the valve core 3, the first connecting portion 211 is relatively far from the axis of the valve core 3 compared with the second connecting portion 12, and the limiting portion 11 is a part of the second connecting portion 12.

[0057] By making the first connecting portion 211 relatively far from the axis of the valve core 3 along the radial direction of the valve core 3, that is, making the first connecting portion 211 riveted outside the second connecting portion 12, so that the second connecting portion 12 provides a supporting effect on the first connecting portion 211, it can ensure that the first sub-seat 21 is not easily deformed inward along the axis of the valve core 3, thereby ensuring that the sliding of the valve core 3 in the first sub-seat 21 will not get stuck, and further ensuring the smoothness of the sliding of the valve core 3 in the first sub-seat 21.

[0058] Further, as Figure 2 and Figure 6As shown, the split-type overflow valve further includes an elastic member 4, a base 5, and a limit assembly. Among them, the elastic member 4 is sleeved on the valve core 3 and is located within the first valve seat 1. One end of the elastic member 4 abuts against the limit platform 31 of the valve core 3. The base 5 is slidably sleeved on the valve core 3 and is disposed opposite to the limit platform 31. The other end of the elastic member 4 abuts against the base 5. That is to say, both ends of the elastic member 4 are limited between the limit platform 31 and the base 5. The limit assembly is disposed within the first valve seat 1 and is connected to the valve core 3. The limit assembly can push the base 5 to compress the elastic member 4 under the action of the oil in the valve core 3, so as to be able to push the valve core 3 to move closer to the valve port 223 along the first direction through the elastic member 4, enabling the valve core 3 to move to close the valve port 223. Among them, the first direction is the axial direction of the first valve seat 1 and is the direction close to the valve port 223, and the first direction is specifically as Figure 2 shown by the arrow A in

[0059] Specifically, as Figure 2 and Figure 6 shown, the limit assembly includes an adjusting sleeve 61, a piston sleeve 62, and a buffer piston 63. Among them, the adjusting sleeve 61 is disposed within the first valve seat 1. At least a part of the piston sleeve 62 is disposed within the adjusting sleeve 61. The first part of the buffer piston 63 is slidably fitted within the adjusting sleeve 61, the second part of the buffer piston 63 is slidably fitted within the piston sleeve 62, and the first part of the buffer piston 63 is sleeved on the outer periphery of the valve core 3. The buffer piston 63 can push the base 5 to compress the elastic member 4 along the first direction under the action of the oil in the valve core 3, and the buffer piston 63 can move along the first direction to abut against the adjusting sleeve 61, such that the buffer piston 63 cannot continue to move along the first direction to push the valve core 3. At this time, the secondary pressure within the split-type overflow valve is fully established.

[0060] Specifically, as Figure 2 and Figure 6 shown, a first damping hole 32 and a first chamber 33 that are connected are respectively provided within the valve core 3. A second chamber 633 is formed within the buffer piston 63, and a third chamber 64 is formed between the first part of the buffer piston 63 and the adjusting sleeve 61. The first chamber 33, the second chamber 633, and the third chamber 64 are interconnected. The oil flowing into the first damping hole 32 can sequentially pass through the first chamber 33, the second chamber 633, and the third chamber 64 along the second direction and flow to the first wall 631 of the buffer piston 63, so that the oil can act on the first wall 631. Among them, the second direction is opposite to the first direction, and the second direction is specifically as Figure 2 shown by the arrow B in

[0061] Furthermore, as Figure 2 and Figure 6As shown in the figure, the adjusting sleeve 61 includes a second wall 611. The first wall 631 is disposed opposite to the second wall 611, so that the space between the first wall 631 and the second wall 611 forms the above-mentioned third chamber 64. And the first wall 631 can move in the first direction until it abuts against the second wall 611. Due to the blocking effect of the second wall 611, the buffer piston 63 cannot continue to move in the first direction to push the valve core 3. At this time, the secondary pressure in the split-type overflow valve is fully established.

[0062] Specifically, as Figure 2 shown, a second damping hole 636 is provided on the first part of the buffer piston 63. The second damping hole 636 is located between the first wall 631 and the second wall 611, and the second damping hole 636 communicates the second chamber 633 with the third chamber 64. That is, the oil in the first damping hole 32 flows through the first chamber 33, the second chamber 633, and the second damping hole 636 in sequence and flows into the third chamber 64, so that the oil acts on the first wall 631 of the buffer piston 63.

[0063] Furthermore, as Figure 2 shown, a through hole 635 is provided on the second part of the buffer piston 63, so that the oil in the second chamber 633 flows through the through hole 635 to the space between the third wall 632 of the buffer piston 63 and the piston sleeve 62. The third wall 632 is disposed opposite to the first wall 631. That is, the oil in the valve core 3 can act on the first wall 631 and the third wall 632 of the buffer piston 63 respectively. Wherein, at least part of the aperture of the second damping hole 636 is smaller than the aperture of the through hole 635.

[0064] Specifically, as Figure 2 shown, the area S1 of the oil acting on the first wall 631 of the buffer piston 63 is smaller than the area S2 of the oil acting on the third wall 632 of the buffer piston 63. And at this time, the acting force of the oil acting on the first wall 631 of the buffer piston 63 is equal to the acting force of the oil acting on the third wall 632 of the buffer piston 63. Therefore, at this time, the buffer piston 63 moves in the first direction under the oil acting forces on the first wall 631 and the third wall 632, so that the buffer piston 63 pushes against the base 5 to compress the elastic member 4, and can push the valve core 3 in the first direction to seal the valve port 223.

[0065] The specific working process of the split-type overflow valve in this embodiment is as follows:

[0066] First, the oil enters through the second end 222 of the second seat 22. At this time, the oil has not yet had time to act on the buffer piston 63 through the first damping hole 32 and the first chamber 33. Therefore, the pressure of the oil at the second end 222 of the second seat 22 acts on the side of the valve core 3 in the first direction, causing the pressure of the oil acting on the side of the valve core 3 to overcome the elastic force of the elastic member 4 to push the valve core 3 to move in the second direction, so that the valve core 3 disengages from the valve port 223 and instantaneously opens the valve port 223.

[0067] While instantaneously opening the valve port 223, the oil at the second end 222 of the second seat 22 can flow through the first damping hole 32 into the first chamber 33, then flow through the first chamber 33 into the second chamber 633, and then flow through the second chamber 633 and the second damping hole 636 into the third chamber 64, causing the oil in the third chamber 64 to act on the first wall 631 of the buffer piston 63; at the same time, the oil in the second chamber 633 flows through the through hole 635 on the buffer piston 63 to the space between the third wall 632 of the buffer piston 63 and the piston sleeve 62, causing the oil to act on the third wall 632 of the buffer piston 63.

[0068] Since the pressures on both sides of the first wall 631 and the third wall 632 of the buffer piston 63 are the same, and the area S1 where the oil acts on the first wall 631 of the buffer piston 63 is smaller than the area S2 where the oil acts on the third wall 632 of the buffer piston 63, at this time, the buffer piston 63 can move in the second direction close to the valve port 223 under the action of the oil, so that the buffer piston 63 pushes the base 5 to compress the elastic member 4, thereby being able to push the valve core 3 to re-seal the valve port 223.

[0069] Then, as the oil pressure at the second end 222 of the second seat 22 increases, and at the same time, when the buffer piston 63 moves in the first direction until it abuts against the second wall 611 of the adjusting sleeve 61, the buffer piston 63 cannot continue to move in the first direction close to the valve port 223. At this time, the secondary pressure of this split-type overflow valve has been fully established.

[0070] Finally, when the oil pressure at the second end 222 of the second seat 22 continues to increase until it can overcome the elastic force of the elastic member 4, the valve core 3 can move in the second direction under the action of the oil pressure at the second end 222 of the second seat 22 to disengage from the valve port 223, causing the valve port 223 to open for overflow; at this time, the valve core 3 pushes the elastic member 4 and the base 5 to move in the second direction, so as to push the buffer piston 63 to move in the second direction until the limiting platform 31 of the valve core 3 abuts against the limiting portion 11 of the first valve seat 1. At this time, the opening of the valve port 223 reaches the maximum, and the valve core 3 cannot continue to move in the second direction.

[0071] In the split overflow valve of this embodiment, by setting the first valve seat 1 and the second valve seat 2 as two independent split structures, the processing difficulty and cost of the first valve seat 1 can be reduced, and the processing accuracy of the first valve seat 1 can be ensured to be better; moreover, the second valve seat 2 can be integrally hardened separately, which is conducive to batch hardening treatment and has a lower cost.

[0072] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. Split-type overflow valve, characterized in that, Comprising: A first valve seat (1); A second valve seat (2), the second valve seat (2) being connected to the first valve seat (1), and a valve port (223) being provided in the second valve seat (2); A valve core (3), a part of the valve core (3) being located within the first valve seat (1), and a part of the valve core (3) being slidably engaged within the second valve seat (2) so that the valve core (3) opens or closes the valve port (223).

2. The split overflow valve according to claim 1, characterized in that, The second valve seat (2) comprises: A first sub-seat (21), the first sub-seat (21) being connected to the first valve seat (1); A second sub-seat (22), one end of the first sub-seat (21) away from the first valve seat (1) being connected to the second sub-seat (22), and the valve core (3) being slidably engaged with the first sub-seat (21), and the valve port (223) being provided in the second sub-seat (22).

3. The split overflow valve according to claim 2, characterized in that, A hard layer is provided on the first sub-seat (21) and / or the second sub-seat (22), and the hardness of the hard layer is greater than the hardness of the first valve seat (1).

4. The split overflow valve according to claim 3, characterized in that, The hard layer comprises a first hard layer and a second hard layer, at least a part of the first hard layer being located on the first sub-seat (21), at least a part of the second hard layer being located on the second sub-seat (22), and the hardness of the second hard layer being greater than the hardness of the first hard layer.

5. The split overflow valve according to claim 3 or 4, characterized in that, The first valve seat (1) comprises a limiting portion (11), the valve core (3) having a first position and a second position. When the valve core (3) is in the first position, the valve core (3) abuts against the second sub-seat (22) to close the valve port (223), and when the valve core (3) is in the second position, the valve core (3) abuts against the limiting portion (11).

6. The split-type overflow valve according to claim 5, characterized in that, The first sub-seat (21) comprises a first connecting portion (211), the first valve seat (1) further comprises a second connecting portion (12), the first connecting portion (211) and the second connecting portion (12) being press-fitted and connected. Along the radial direction of the valve core (3), the first connecting portion (211) is farther away from the axis of the valve core (3) relative to the second connecting portion (12), and the limiting portion (11) is a part of the second connecting portion (12).

7. The split overflow valve according to claim 3 or 4, characterized in that, The split-type overflow valve further comprises: An elastic member (4), sleeved on the valve core (3) and located within the first valve seat (1), one end of the elastic member (4) abutting against the limiting platform (31) of the valve core (3); A base (5), slidably sleeved on the valve core (3) and disposed opposite to the limiting platform (31), the other end of the elastic member (4) abutting against the base (5); A limiting assembly, provided within the first valve seat (1) and connected to the valve core (3), the limiting assembly being capable of pushing against the base (5) to compress the elastic member (4) so as to push the valve core (3) to move along a first direction close to the valve port (223), the first direction being the axial direction of the first valve seat (1) and the direction close to the valve port (223).

8. The split overflow valve according to claim 7, wherein The limiting assembly comprises: An adjusting sleeve (61), provided within the first valve seat (1); A piston sleeve (62), at least a part of the piston sleeve (62) is disposed within the adjusting sleeve (61); A buffer piston (63), a first part of the buffer piston (63) is slidably fitted within the adjusting sleeve (61), a second part of the buffer piston (63) is slidably fitted within the piston sleeve (62), and the first part of the buffer piston (63) is sleeved on the outer periphery of the valve core (3). The buffer piston (63) can push the base (5) along the first direction to compress the elastic member (4), and the buffer piston (63) can move along the first direction to abut against the adjusting sleeve (61).

9. The split overflow valve according to claim 8, wherein, A first damping hole (32) and a first chamber (33) that are communicated with each other are respectively provided within the valve core (3). A second chamber (633) is formed within the buffer piston (63), and a third chamber (64) is formed between the first part of the buffer piston (63) and the adjusting sleeve (61). The first chamber (33), the second chamber (633), and the third chamber (64) are communicated with each other. The oil fluid in the first damping hole (32) can flow along the second direction through the first chamber (33), the second chamber (633), and the third chamber (64) in sequence to reach the first wall (631) of the buffer piston (63), and the second direction is opposite to the first direction.

10. The split-type overflow valve according to claim 9, characterized in that, The adjusting sleeve (61) includes a second wall (611), the first wall (631) is disposed opposite to the second wall (611), so that the space between the first wall (631) and the second wall (611) forms the third chamber (64), and the first wall (631) can move along the first direction to abut against the second wall (611); A through hole (635) is provided on the second part of the buffer piston (63), so that the oil fluid in the second chamber (633) flows through the through hole (635) to the space between the third wall (632) of the buffer piston (63) and the piston sleeve (62). The third wall (632) is disposed opposite to the first wall (631). The area S1 of the oil fluid acting on the first wall (631) is smaller than the area S2 of the oil fluid acting on the third wall (632).

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