CN215763455U - Superposed hydraulic control one-way valve - Google Patents
Superposed hydraulic control one-way valve Download PDFInfo
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- CN215763455U CN215763455U CN202121810644.9U CN202121810644U CN215763455U CN 215763455 U CN215763455 U CN 215763455U CN 202121810644 U CN202121810644 U CN 202121810644U CN 215763455 U CN215763455 U CN 215763455U
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Abstract
The utility model discloses a superposed hydraulic control one-way valve, which comprises a valve body, at least one-way valve seat and at least one-way valve core, wherein the valve body is provided with an inner cavity, at least one oil inlet and at least one oil outlet, and the oil inlet and the oil outlet are both communicated with the inner cavity; the one-way valve seat is arranged in the inner cavity and is provided with a communicating groove which is communicated with the oil inlet and the oil outlet, and the communicating groove is positioned between the oil inlet and the oil outlet; the one-way valve core is movably connected with the wall of the inner cavity and is positioned on one side of the one-way valve seat; one of the position of the notch at one end of the one-way valve seat, which is adjacent to the communicating groove, and the one of the end of the one-way valve core, which is adjacent to the one-way valve seat, is provided with an angular part, and the other of the position of the notch at one end of the one-way valve seat, which is adjacent to the communicating groove, and the other of the position of the notch at one end of the one-way valve core, which is adjacent to the one-way valve seat, is provided with a contact inclined surface. According to the technical scheme, the contact area between the one-way valve core and the one-way valve seat is reduced, and the liquid oil leakage amount of the overlapped hydraulic control one-way valve is reduced.
Description
Technical Field
The utility model relates to the technical field of one-way valves, in particular to a superposition type hydraulic control one-way valve.
Background
The superposition type hydraulic control one-way valve in the related art generally comprises a valve body, a one-way valve core and a one-way valve seat, wherein the one-way valve core and the one-way valve seat are arranged in the valve body; however, because the abutting area of the check valve core and the check valve seat is large, after the check valve core abuts against the check valve seat, and the oil inlet is in a pressure-loss state, liquid oil is easy to leak from the contact surface of the two abutments, so that the leakage amount of the superposed hydraulic control check valve is large, and the normal operation of the superposed hydraulic control check valve is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a superposed hydraulic control one-way valve, aiming at reducing the contact area between a one-way valve core and a one-way valve seat and reducing the liquid oil leakage amount of the superposed hydraulic control one-way valve.
In order to achieve the above object, the present invention provides a stacked hydraulic control check valve, including:
the valve body is provided with an inner cavity, at least one oil inlet and at least one oil outlet, and the oil inlet and the oil outlet are communicated with the inner cavity;
the one-way valve seat is arranged in the inner cavity, a communication groove for communicating the oil inlet and the oil outlet is formed, and the communication groove is positioned between the oil inlet and the oil outlet; and
the one-way valve core is movably connected to the wall of the inner cavity and positioned on one side of the one-way valve seat;
one of the position of the notch at one end of the check valve seat, which is adjacent to the communication groove, and the end of the check valve core, which is adjacent to the check valve seat, is provided with a corner part, and the other of the position of the notch at one end of the check valve seat, which is adjacent to the communication groove, and the end of the check valve core, which is adjacent to the check valve seat, is provided with a contact inclined plane;
the superposed hydraulic control one-way valve has an open state and a closed state, and is in the closed state, the one-way valve core extends into the communication groove, and the contact inclined plane is abutted against the corner part, so that the one-way valve core blocks the communication opening.
In one embodiment, the corner part is arranged at a position of the one-way valve seat adjacent to a notch at one end of the communication groove, and the contact inclined plane is arranged at one end of the one-way valve core adjacent to the one-way valve seat;
when the sealing device is in the closed state, the contact inclined surface is abutted against the corner part and forms a contact point.
In one embodiment, the contact ramp extends around the periphery of the one-way valve spool;
and/or the corner part extends around the notch of the communication groove.
In an embodiment, the stacked hydraulic control check valve further includes a main valve element movably connected to the inner cavity wall and movably disposed in the communicating groove in a penetrating manner;
one end of the one-way valve core, which is adjacent to the one-way valve seat, is also provided with a contact plane, and the contact plane is adjacent to the contact inclined plane;
and in the closed state, the main valve core extends into the communication groove and is abutted against the contact plane of the one-way valve core.
In one embodiment, the main spool includes:
the sliding block is connected to the wall of the inner cavity in a sliding manner;
at least one connecting part connected with the sliding block; and
and the abutting part is connected with one end, away from the sliding block, of the connecting part, and the area of the end face of one end, away from the connecting part, of the abutting part is the same as that of the contact plane.
In one embodiment, the connecting portion is provided with a flow guiding inclined surface, and the flow guiding inclined surface extends around the periphery of the connecting portion.
In one embodiment, a groove is concavely arranged on one side of the check valve seat facing the check valve core, and the groove extends around the notch of the communication groove.
In one embodiment, the groove side wall of the communication groove is provided with a guide inclined surface, and the guide inclined surface extends around the groove side wall of the communication groove and is arranged far away from the corner part.
In one embodiment, the one-way valve cartridge includes:
the plug is arranged on the cavity wall of the inner cavity and is provided with a first inner groove;
the contact inclined plane is arranged at one end of the valve core head, a second inner groove is arranged at one end of the valve core head, which is back to the contact inclined plane, and the notch of the second inner groove is opposite to the notch of the first inner groove; and
and one end of the spring is arranged in the first inner groove, and the other end of the spring is arranged in the second inner groove.
In one embodiment, the outer wall of the plug is in interference abutment with the wall of the lumen.
The superposition type hydraulic control one-way valve comprises a valve body, at least one-way valve seat and at least one-way valve core, wherein the valve body is provided with an inner cavity, at least one oil inlet and at least one oil outlet, and the oil inlet and the oil outlet are communicated with the inner cavity; the one-way valve seat is arranged in the inner cavity and is provided with a communicating groove which is communicated with the oil inlet and the oil outlet, and the communicating groove is positioned between the oil inlet and the oil outlet; the one-way valve core is movably connected with the wall of the inner cavity and is positioned on one side of the one-way valve seat; so set up, during edges and corners and contact inclined plane butt, the most sharp-pointed position and the contact inclined plane butt of edges and corners, and then reduced the area of contact of check valve core and check valve seat to reduce the liquid oil leakage volume of stack formula liquid accuse check valve.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a stacked pilot-controlled check valve according to the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a superposition type hydraulic control one-way valve.
In the embodiment of the utility model, referring to fig. 1, the overlapped hydraulic control one-way valve comprises a valve body 10, at least one-way valve seat 20 and at least one-way valve core 30, the valve body 10 is provided with an inner cavity 10a, at least one oil inlet 10b and at least one oil outlet 10c, and the oil inlet 10b and the oil outlet 10c are both communicated with the inner cavity 10 a; the one-way valve seat 20 is arranged in the inner cavity 10a, and is provided with a communication groove 20a for communicating the oil inlet 10b and the oil outlet 10c, and the communication groove 20a is positioned between the oil inlet 10b and the oil outlet 10 c; the one-way valve core 30 is movably connected with the cavity wall of the inner cavity 10a and is positioned at one side of the one-way valve seat 20; wherein, one of the position of the one-way valve seat 20 adjacent to the notch of the one end of the communication groove 20a and the one end of the one-way valve core 30 adjacent to the one-way valve seat 20 is provided with an angular portion 21, and the other of the position of the one-way valve seat 20 adjacent to the notch of the one end of the communication groove 20a and the one end of the one-way valve core 30 adjacent to the one-way valve seat 20 is provided with a contact inclined surface 30 a; the superposed hydraulic control check valve has an open state and a closed state, and is in the closed state, the check valve core 30 extends into the communication groove 20a, and the contact inclined surface 30a abuts against the corner 21, so that the check valve core 30 blocks the communication opening.
In the present embodiment, the stacked pilot operated check valve is generally applied to a vertical hydraulic cylinder, and due to leakage of the spool and the pipe, the piston and the piston rod may be caused to slide down under the gravity of the piston and the piston rod. The hydraulic control one-way valve is connected with an oil way of the lower cavity of the hydraulic cylinder, so that the movable parts such as the piston, the sliding block and the like of the hydraulic cylinder can be prevented from sliding downwards;
when liquid oil enters the inner cavity 10a and the communicating groove 20a from the oil inlet 10b, the liquid oil can push the check valve core 30 to move in the direction away from the notch of the communicating groove 20a, so that the check valve core 30 does not block the notch of the communicating groove 20a any more, the liquid oil can enter the oil outlet 10c from the communicating groove 20a, and oil path communication is realized;
when no liquid oil enters the inner cavity 10a from the oil inlet 10b, namely the superposed hydraulic control check valve is in a decompression state, the movable end of the check valve core 30 is reset at the moment, so that the edge part 21 or the contact inclined surface 30a of the check valve core 30 is abutted against the contact inclined surface 30a or the edge part 21 of the check valve seat 20, and the notch of the communication groove 20a is further sealed by the check valve core 30;
when the edge part 21 abuts against the contact inclined surface 30a, the sharpest position of the edge part 21 abuts against the contact inclined surface 30a, and further the contact area between the check valve element 30 and the check valve seat 20 is reduced, thereby reducing the amount of leakage of the liquid oil of the stacked pilot-controlled check valve.
The contact area of the one-way valve core 30 and the one-way valve seat 20 is improved to achieve the best filling, the pressure maintaining effect is improved, the overall flow of the superposed type hydraulic control one-way valve is not changed, and the leakage rate of the superposed type hydraulic control one-way valve is reduced by about 30-40% compared with that of a common hydraulic control one-way valve.
The technical scheme of the utility model is that the superposed hydraulic control one-way valve comprises a valve body 10, at least one-way valve seat 20 and at least one-way valve core 30, wherein the valve body 10 is provided with an inner cavity 10a, at least one oil inlet 10b and at least one oil outlet 10c, and the oil inlet 10b and the oil outlet 10c are both communicated with the inner cavity 10 a; the one-way valve seat 20 is arranged in the inner cavity 10a, and is provided with a communication groove 20a for communicating the oil inlet 10b and the oil outlet 10c, and the communication groove 20a is positioned between the oil inlet 10b and the oil outlet 10 c; the one-way valve core 30 is movably connected with the cavity wall of the inner cavity 10a and is positioned at one side of the one-way valve seat 20; with the arrangement, when the corner portion 21 abuts against the contact inclined surface 30a, the sharpest position of the corner portion 21 abuts against the contact inclined surface 30a, so that the contact area between the check valve element 30 and the check valve seat 20 is reduced, and the liquid oil leakage amount of the stacked pilot-controlled check valve is reduced.
In one embodiment, referring to fig. 1, a corner portion 21 is provided at a position of the check valve seat 20 adjacent to a notch at one end of the communication groove 20a, and a contact inclined surface 30a is provided at one end of the check valve element 30 adjacent to the check valve seat 20; in the closed state, the contact slope 30a abuts against the corner portion 21 and forms a contact point.
In the present embodiment, the check valve seat 20 is provided with an angular portion 21 at the notch of the communication groove 20a, that is, the corresponding corner at the notch of the communication groove 20a is a corner of 90 degrees, and the check valve element 30 is provided with a contact inclined surface 30 a; so set up, in the tip that check valve core 30 set up contact inclined plane 30a stretched into the intercommunication groove 20a more easily, when contact inclined plane 30a and angular portion 21 butt, angular portion 21 only had the most outstanding position just can with contact inclined plane 30a butt, when guaranteeing check valve core 30 normal operating, can also reduce the liquid oil leakage volume of stack formula pilot operated check valve.
In one embodiment, referring to fig. 1, the contact ramp 30a extends around the periphery of the check valve spool 30; the angular portion 21 extends around the notch of the communication groove 20 a. So set up, the periphery of whole check valve core 30 sets up contact inclined plane 30a, and the notch department of the intercommunication groove 20a of check valve seat 20 sets up annular edges and corners 21, moves towards the direction of the notch that is close to intercommunication groove 20a when check valve core 30 for the peripheral contact inclined plane 30a of check valve core 30 and the edges and corners 21 of check valve seat 20 can all-round butt, and then guarantee that stack formula pilot operated check valve reaches the effect of sealed pressurize.
Optionally, one end of the check valve core 30, which is far away from the notch of the communication groove 20a, is provided with a chamfer, so that the friction of the check valve core 30 on the wall of the inner cavity 10a of the valve body 10 in the moving process is avoided.
In an embodiment, referring to fig. 1, the stacked pilot-controlled check valve further includes a main valve element 40, and the main valve element 40 is movably connected to the cavity wall of the inner cavity 10a and movably disposed in the communicating groove 20 a; one end of the one-way valve core 30 adjacent to the one-way valve seat 20 is also provided with a contact plane 30b, and the contact plane 30b is arranged adjacent to the contact inclined plane 30 a; in the closed state, main spool 40 extends into communication groove 20a and abuts against contact flat surface 30b of check spool 30.
In this embodiment, the superimposed pilot-controlled check valve includes two check valve cores 30 and two check valve seats 20, the two check valve seats 20 are spaced apart from the cavity wall of the inner cavity 10a, the main valve core 40 is located between the two check valve seats 20, and each check valve core 30 is slidably connected to a side of one check valve seat 20 opposite to the main valve core 40; the valve body 10 is provided with two oil inlets 10b and two oil outlets 10c, the two oil inlets 10b are arranged at one side of the valve body 10 at intervals, and the two oil outlets 10c are arranged at the opposite side of the valve body 10 at intervals;
when liquid oil flows from one of the oil inlets 10b to the opposite oil outlet 10c, the check valve element 30 corresponding to the oil inlet 10b is pushed to move in a direction away from the communication groove 20a, and the main valve element 40 is also pushed to the right side, so that the main valve element 40 pushes the other check valve element 30 to move in a direction away from the communication groove 20a, and the two oil inlets 10b are respectively communicated with the two oil outlets 10 c.
When the two oil inlets 10b lose pressure, the two check valve cores 30 are not pushed by the liquid oil, so that the two check valve cores 30 are respectively pressed on the notches of the communicating grooves 20a of the two check valve seats 20, and the oil paths formed by the two oil inlets 10b and the two oil outlets 10c are cut off.
To ensure that the two check valve cores 30 are correctly positioned to close the notch of the communication groove 20a, a reversing valve with a Y-shaped function is used, the main valve core 40 is in a middle position, and the two oil inlets 10b are communicated with the oil tank.
In an embodiment, referring to fig. 1, main spool 40 includes a sliding block 41, at least one connecting portion 42 and at least one abutting portion 43, sliding block 41 is slidably connected to the wall of inner cavity 10 a; the connecting part 42 is connected with the sliding block 41; the abutting portion 43 is connected to an end of the connecting portion 42 away from the slide block 41, and an end surface area of the abutting portion 43 away from the connecting portion 42 is the same as an area of the contact plane 30 b.
In the present embodiment, the area of the end surface of the abutting portion 43 is the same as the area of the contact plane 30b, so that the contact area between the main valve element 40 and the check valve element 30 is increased to improve the fitting capability of the main valve element 40 and the check valve element 30.
Optionally, the ends of connecting portion 42 and sliding block 41 are arranged in a circular arc transition, so as to avoid main valve element 40 from being worn by the wall of inner cavity 10a during movement.
In one embodiment, referring to fig. 1, the connecting portion 42 is provided with a diversion inclined surface 42a, and the diversion inclined surface 42a extends around the periphery of the connecting portion 42.
In this embodiment, the inner cavity 10a includes a main cavity, two installation cavities, and two strip-shaped grooves, which are respectively located at two sides of the main cavity and are communicated with the main cavity; the two mounting cavities are respectively positioned on one side of the two strip-shaped grooves far away from the main cavity and are communicated with the strip-shaped grooves; the two oil inlets 10b are communicated with the main cavity, and the two oil outlets 10c are respectively communicated with one ends of the strip-shaped grooves far away from the oil inlets 10 b; the two one-way valve seats 20 are respectively arranged on the two side cavity walls of the main cavity body, and the two one-way valve cores 30 are respectively movably connected in the two installation cavities.
In one embodiment, referring to fig. 1, a side of the check valve seat 20 facing the check valve element 30 is recessed with a groove 20b, and the groove 20b is extended around a notch of the communication groove 20 a.
In the present embodiment, by providing the recess 20b in the check valve seat 20, the recess 20b is an annular groove surrounding the notch of the communication groove 20a, and the recess 20b can further reduce the contact area between the check valve seat 20 and the check valve element 30, thereby further reducing the amount of leakage of the hydraulic oil of the stacked pilot-controlled check valve.
In an embodiment, referring to fig. 1, the groove side wall of the communication groove 20a is provided with a guide slope 201a, and the guide slope 201a is provided extending around the groove side wall of the communication groove 20a and is provided away from the corner portion 21.
In the present embodiment, the groove side wall of the end of the communication groove 20a away from the corner 21 is provided with a guide slope 201a, and the guide slope 201a is inclined in the same direction as the flow guide slope 42a of the connecting portion 42 of the main valve element 40; when main spool 40 moves in internal chamber 10a, guide slope 201a of communication groove 20a contacts guide slope 42a of main spool 40, so that main spool 40 moves more smoothly.
In an embodiment, referring to fig. 1, the one-way valve core 30 includes a plug 31, a valve core head 32 and a spring 33, the plug 31 is disposed on the cavity wall of the inner cavity 10a and is provided with a first inner groove; one end of the valve core head 32 is provided with a contact inclined plane 30a, one end of the valve core head 32, which is back to the contact inclined plane 30a, is provided with a second inner groove, and the notch of the second inner groove is opposite to the notch of the first inner groove; one end of the spring 33 is attached to the first inner tank, and the other end of the spring 33 is attached to the second inner tank.
In the present embodiment, the valve core head 32 is fixed at the cavity wall of the inner cavity 10a by the plug 31, so that the valve core head 32 moves in the inner cavity 10a more stably; when the oil inlet 10b is in a pressure-loss state, the spring 33 can drive the valve core head 32 to move toward the main valve core 40, so that the valve core head 32 is elastically abutted to the main valve core 40, thereby improving the pressure maintaining effect of the stacked hydraulic control check valve.
In one embodiment, referring to fig. 1, the outer wall of plug 31 is in interference abutment with the wall of lumen 10 a. According to the arrangement, the plug 31 is abutted to the cavity wall of the inner cavity 10a more tightly, the interference fit between the plug 31 and the cavity wall of the inner cavity 10a is 3-5 threads, and the leakage amount and the pressure maintaining effect of the superposed hydraulic control one-way valve are influenced when the size is exceeded or reduced.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A stacked hydraulic control check valve, characterized in that, the stacked hydraulic control check valve includes:
the valve body is provided with an inner cavity, at least one oil inlet and at least one oil outlet, and the oil inlet and the oil outlet are communicated with the inner cavity;
the one-way valve seat is arranged in the inner cavity, a communication groove for communicating the oil inlet and the oil outlet is formed, and the communication groove is positioned between the oil inlet and the oil outlet; and
the one-way valve core is movably connected to the wall of the inner cavity and positioned on one side of the one-way valve seat;
one of the position of the notch at one end of the check valve seat, which is adjacent to the communication groove, and the end of the check valve core, which is adjacent to the check valve seat, is provided with a corner part, and the other of the position of the notch at one end of the check valve seat, which is adjacent to the communication groove, and the end of the check valve core, which is adjacent to the check valve seat, is provided with a contact inclined plane;
the superposed hydraulic control one-way valve has an open state and a closed state, and is in the closed state, the one-way valve core extends into the communication groove, and the contact inclined plane is abutted against the corner part, so that the one-way valve core blocks the notch of the communication groove.
2. A stacked pilot-controlled check valve according to claim 1, wherein the corner portion is provided at a position of the check valve seat adjacent to a notch at one end of the communication groove, and the contact inclined surface is provided at one end of the check valve element adjacent to the check valve seat;
when the sealing device is in the closed state, the contact inclined surface is abutted against the corner part and forms a contact point.
3. A stacked pilot operated check valve as defined in claim 2 wherein the contact ramp extends around the periphery of the check valve spool;
and/or the corner part extends around the notch of the communication groove.
4. A stacked hydraulic control one-way valve according to any one of claims 1 to 3, further comprising a main valve element movably connected to the inner cavity wall and movably inserted into the communication groove;
one end of the one-way valve core, which is adjacent to the one-way valve seat, is also provided with a contact plane, and the contact plane is adjacent to the contact inclined plane;
and in the closed state, the main valve core extends into the communication groove and is abutted against the contact plane of the one-way valve core.
5. A stacked pilot operated check valve as defined in claim 4 wherein said main spool includes:
the sliding block is connected to the wall of the inner cavity in a sliding manner;
at least one connecting part connected with the sliding block; and
and the abutting part is connected with one end, away from the sliding block, of the connecting part, and the area of the end face of one end, away from the connecting part, of the abutting part is the same as that of the contact plane.
6. A stacked pilot operated check valve as defined in claim 5 wherein the connecting portion is provided with a pilot ramp extending around the periphery of the connecting portion.
7. A stacked pilot-operated check valve according to any one of claims 1 to 3, wherein a side of the check valve seat facing the check valve element is recessed with a groove, and the groove is provided extending around a notch of the communication groove.
8. A stacked pilot operated check valve as defined in claim 7 wherein the groove side walls of the communication grooves are provided with guide slopes extending around the groove side walls of the communication grooves and away from the corner portions.
9. A stacked pilot operated check valve as defined in any one of claims 1 to 3 wherein the check valve spool comprises:
the plug is arranged on the cavity wall of the inner cavity and is provided with a first inner groove;
the contact inclined plane is arranged at one end of the valve core head, a second inner groove is arranged at one end of the valve core head, which is back to the contact inclined plane, and the notch of the second inner groove is opposite to the notch of the first inner groove; and
and one end of the spring is arranged in the first inner groove, and the other end of the spring is arranged in the second inner groove.
10. A stacked pilot operated check valve as recited in claim 9, wherein an outer wall of the plug is in interference abutment with a wall of the inner chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121810644.9U CN215763455U (en) | 2021-08-04 | 2021-08-04 | Superposed hydraulic control one-way valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121810644.9U CN215763455U (en) | 2021-08-04 | 2021-08-04 | Superposed hydraulic control one-way valve |
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| CN215763455U true CN215763455U (en) | 2022-02-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606365A (en) * | 2021-08-04 | 2021-11-05 | 佛山市顺德区澄宇液压机电有限公司 | Superposed hydraulic control one-way valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606365A (en) * | 2021-08-04 | 2021-11-05 | 佛山市顺德区澄宇液压机电有限公司 | Superposed hydraulic control one-way valve |
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