CN109764019B - Multi-way valve with integrated oil supplementing and overload hydraulic lock based on coaxial integration - Google Patents
Multi-way valve with integrated oil supplementing and overload hydraulic lock based on coaxial integration Download PDFInfo
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- CN109764019B CN109764019B CN201910081475.0A CN201910081475A CN109764019B CN 109764019 B CN109764019 B CN 109764019B CN 201910081475 A CN201910081475 A CN 201910081475A CN 109764019 B CN109764019 B CN 109764019B
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- 230000001502 supplementing effect Effects 0.000 title claims abstract description 22
- 230000010354 integration Effects 0.000 title claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 239000002131 composite material Substances 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 195
- 238000010586 diagram Methods 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Abstract
The invention discloses a multi-way valve with an integral oil supplementing and overload function based on coaxial integration, which comprises a main valve body, wherein a main valve hole, a main valve rod, a shuttle valve hole and a shuttle valve core are arranged in the main valve body, an oil way A and an oil way B are arranged on the main valve body, and an oil way AC, an oil way BC, an oil way AP, an oil way BP, an oil way TA and an oil way TB are arranged between the shuttle valve hole and the main valve hole; a one-way overflow combination valve is arranged in the shuttle valve hole at the outer side of one end of the shuttle valve core in a sealing way, and a one-way overflow combination valve or a sealing end cover is arranged in the shuttle valve hole at the outer side of the other end of the shuttle valve core in a sealing way; the one-way overflow combined valve and the shuttle valve core are used as a whole, and the one-way overflow combined valve has the functions of an overload valve, a one-way valve and a hydraulic lock, breaks through the design that the traditional hydraulic lock has no overload function, breaks through the function that the traditional overload valve cannot realize the hydraulic lock, and realizes a novel composite function valve with overload and high-response locking functions.
Description
Technical Field
The invention relates to a multi-way valve, in particular to a multi-way valve with an integrated hydraulic lock with functions of oil supplementing and overload.
Background
The traditional overload valve and the hydraulic lock are two relatively independent elements for realizing different functions, and the traditional hydraulic lock has no design of the overload function, so that the traditional overload valve cannot realize the function of the hydraulic lock; the traditional overload valve oil supplementing adopts differential locking, and has slower response and unreliable response.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-way valve which is compact in structure and small in size and is based on a coaxial integrated hydraulic lock with the functions of oil supplementing and overload.
In order to solve the technical problems, the technical scheme of the invention is as follows: the multi-way valve based on the coaxial integrated hydraulic lock with the same-body oil supplementing and overload functions comprises a main valve body, wherein an oil inlet P and an oil return port T are formed in the main valve body, a main valve hole is formed in the main valve body, a main valve rod is installed in the main valve hole, a shuttle valve hole is formed in the main valve body on one side of the main valve rod, a shuttle valve core is installed in the shuttle valve hole, an oil way A and an oil way B which are communicated with the shuttle valve hole are formed in the main valve body, and the oil way A and the oil way B are positioned at two ends of the same side of the shuttle valve core; an oil duct AC and an oil duct BC are arranged between the shuttle valve hole and the main valve hole at two ends of the shuttle valve core, an oil duct AP and an oil duct BP are sequentially communicated with the main valve hole between the oil duct AC and the oil duct BC, and the oil duct AP and the oil duct BP are communicated with the oil inlet P; an oil duct TA is arranged between the main valve hole and the shuttle valve hole outside the oil duct AC, and an oil duct TB is arranged between the main valve hole and the shuttle valve hole outside the oil duct BC;
the one-way overflow combination valve is arranged in the shuttle valve hole on the outer side of one end of the shuttle valve core in a sealing mode, and the one-way overflow combination valve or a sealing end cover is arranged in the shuttle valve hole on the outer side of the other end of the shuttle valve core in a sealing mode.
As a preferable technical solution, the shuttle valve hole is disposed parallel to the main valve hole, and the shuttle valve core is disposed parallel to the main valve rod.
As a preferable technical scheme, the one-way overflow combined valve comprises a combined valve body with one end extending into the shuttle valve hole, and a coaxial one-way valve and an overflow valve are arranged in the combined valve body.
As a preferable technical scheme, the check valve comprises a check valve core arranged in the combined valve body, the end part of the shuttle valve core stretches into the combined valve body and is close to the check valve core, a check valve seat is arranged in the combined valve body outside the check valve core, and a check valve return spring is arranged between the check valve core and the check valve seat; the combined valve body is provided with an oil passing hole a which is communicated with the oil passage AC and the oil inlet end of the one-way valve, and the combined valve body is also provided with an oil passing hole b which is communicated with the oil passage A and the oil outlet end of the one-way valve cavity.
As a preferable technical scheme, an inner cavity facing the opening of the check valve return spring is arranged in the check valve core, one end of the check valve return spring is abutted against the cone valve seat, and the other end of the check valve return spring extends into the inner cavity of the check valve core.
As a preferable technical scheme, the one-way valve seat is also used as a cone valve seat of the overflow valve, a cone valve hole communicated with an inner cavity of a valve core of the one-way valve is arranged in the cone valve seat, a cone valve core with one end extending into the cone valve hole is arranged in the combined valve body at the outer side of the cone valve seat, a plug is arranged at the opening end of the combined valve body in a sealing manner, and an overflow return spring is arranged between the cone valve core and the plug; an overflow cavity is arranged between the cone valve seat and the plug, and an overflow hole which is communicated with the overflow cavity and the oil duct TA is arranged on the combined valve body.
Due to the adoption of the technical scheme, the multi-way valve with the same-body oil supplementing and overload functions based on coaxial integration comprises a main valve body, wherein an oil inlet P and an oil return port T are arranged on the main valve body, a main valve hole is formed in the main valve body, a main valve rod is arranged in the main valve hole, a shuttle valve hole is formed in the main valve body on one side of the main valve rod, a shuttle valve core is arranged in the shuttle valve hole, an oil way A and an oil way B which are communicated with the shuttle valve hole are arranged on the main valve body, and the oil way A and the oil way B are positioned at two ends on the same side of the shuttle valve core; an oil duct AC and an oil duct BC are arranged between the shuttle valve hole and the main valve hole at two ends of the shuttle valve core, an oil duct AP and an oil duct BP are sequentially communicated with the main valve hole between the oil duct AC and the oil duct BC, and the oil duct AP and the oil duct BP are communicated with the oil inlet P; an oil duct TA is arranged between the main valve hole and the shuttle valve hole outside the oil duct AC, and an oil duct TB is arranged between the main valve hole and the shuttle valve hole outside the oil duct BC; a one-way overflow combination valve is arranged in the shuttle valve hole at the outer side of one end of the shuttle valve core in a sealing way, and a one-way overflow combination valve or a sealing end cover is arranged in the shuttle valve hole at the outer side of the other end of the shuttle valve core in a sealing way; the one-way overflow combined valve and the shuttle valve core are used as a whole, and the one-way overflow combined valve has the functions of an overload valve, a one-way valve and a hydraulic lock, breaks through the design that the traditional hydraulic lock has no overload function, breaks through the function that the traditional overload valve cannot realize the hydraulic lock, and realizes a novel composite function valve with overload and high-response locking functions.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a schematic diagram of a two-way hydraulic lock according to an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of a unidirectional hydraulic lock according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of the oil replenishing state of the bidirectional hydraulic lock according to the embodiment of the invention;
FIG. 4 is an enlarged view of a one-way overflow combination valve according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a two-way hydraulic lock according to an embodiment of the present invention;
In the figure: 11-a main valve body; 12-oil inlet P; 13-a main valve stem; 14-an oil way A; 15-an oil way B; 21-oil passage AC; 22-oil duct BC; 23-oil duct AP; 24-oil passage BP; 25-oil passage TA; 26-oil passage TB; 31-shuttle valve core; 32-sealing end caps; 41-a combined valve body; 42-a check valve core; 43-a check valve return spring; 44-an oil passing hole a; 45-an oil passing hole b; 46-overflow aperture; 51-cone valve seat; 52-cone valve core; 53-plugs; 54-overflow return spring; 55-overflow chamber.
Detailed Description
The invention is further illustrated in the following, in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is needless to say that the person skilled in the art realizes that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope.
As shown in fig. 1 and 5, the multi-way valve based on coaxial integration and having the same body oil supplementing and overload functions comprises a main valve body 11, wherein an oil inlet P12 and an oil return port T are arranged on the main valve body 11, a main valve hole is arranged in the main valve body 11, a main valve rod 13 is arranged in the main valve hole, a shuttle valve hole is arranged on the main valve body 11 at one side of the main valve rod 13, a shuttle valve core 31 is arranged in the shuttle valve hole, the shuttle valve hole is parallel to the main valve hole, and the shuttle valve core 31 is parallel to the main valve rod 13. The main valve body 11 is provided with an oil path A14 and an oil path B15 which are communicated with the shuttle valve hole, and the oil path A14 and the oil path B15 are positioned at two ends of the same side of the shuttle valve core 31; an oil duct AC21 and an oil duct BC22 are arranged between the shuttle valve hole and the main valve hole at both ends of the shuttle valve core 31, an oil duct AP23 and an oil duct BP24 are sequentially communicated with the main valve hole between the oil duct AC21 and the oil duct BC22, and the oil duct AP23 and the oil duct BP24 are both communicated with the oil inlet P12; an oil duct TA25 is arranged between the main valve hole and the shuttle valve hole outside the oil duct AC21, and an oil duct TB26 is arranged between the main valve hole and the shuttle valve hole outside the oil duct BC 22;
The shuttle valve hole outside one end of the shuttle valve core 31 is provided with a one-way overflow combination valve in a sealing manner, as shown in fig. 2, and the shuttle valve hole outside the other end of the shuttle valve core 31 is provided with a one-way overflow combination valve or a sealing end cover 32 in a sealing manner. As shown in fig. 1, a one-way overflow combination valve is hermetically installed in the shuttle valve hole at the outer sides of both ends of the shuttle valve core 31; as shown in fig. 2, the shuttle valve hole outside one end of the shuttle valve core 31 is provided with a one-way overflow combination valve in a sealing manner, and the shuttle valve hole outside the other end of the shuttle valve core 31 is provided with a sealing end cover 32 in a sealing manner.
As shown in fig. 1 and 4, the one-way overflow combination valve comprises a combination valve body 41 with one end extending into the shuttle valve hole, and a coaxial one-way valve and an overflow valve are arranged in the combination valve body 41. The check valve comprises a check valve core 42 installed in the combined valve body 41, the end part of the shuttle valve core 31 extends into the combined valve body 41 and is close to the check valve core 42, a check valve seat is installed in the combined valve body 41 outside the check valve core 42, and a check valve return spring 43 is installed between the check valve core 42 and the check valve seat; the combined valve body 41 is provided with an oil passing hole a44 which is communicated with the oil passage AC21 and the oil inlet end of the one-way valve, and the combined valve body 41 is also provided with an oil passing hole b45 which is communicated with the oil passage A14 and the oil outlet end of the one-way valve cavity. An inner cavity facing the opening of the check valve return spring 43 is arranged in the check valve core, one end of the check valve return spring 43 is abutted against the cone valve seat 51, and the other end of the check valve return spring extends into the inner cavity of the check valve core. The one-way valve seat is also used as a cone valve seat 51 of the overflow valve, a cone valve hole communicated with the inner cavity of the valve core 42 of the one-way valve is arranged in the cone valve seat 51, a cone valve core 52 with one end extending into the cone valve hole is arranged in the combined valve body at the outer side of the cone valve seat 51, a plug 53 is arranged at the opening end of the combined valve body 41 in a sealing manner, and an overflow return spring 54 is arranged between the cone valve core 52 and the plug 53; an overflow cavity 55 is arranged between the cone valve seat 51 and the plug 53, and the combined valve body 41 is provided with an overflow hole 46 which is communicated with the overflow cavity 55 and the oil duct TA 25.
The one-way overflow combination valve and the shuttle valve core 31 are integrated with the functions of an overload valve, a one-way valve and a hydraulic lock, so that the design that the traditional hydraulic lock has no overload function is broken through, the function that the traditional overload valve cannot realize the hydraulic lock is broken through, and a novel composite function valve with overload and high-response locking functions is realized. Unlike conventional overload valves and hydraulic locks are: the single-side overload valve and the single-side hydraulic lock are integrally inserted components which are coaxially designed, the single-side overload valve and the single-side hydraulic lock are integrally threaded inserted components, the outer side of the single-side overload valve is an overload function, the inner side of the single-side overload valve is a function of a one-way hydraulic lock or a one-way valve, the two functions are integrated into a brand new structure, the design that the traditional hydraulic lock has no overload function is broken through, the function that the traditional overload valve cannot realize the hydraulic lock is broken through, and the novel valve with the composite functions of overload and high-response locking is realized. The hydraulic lock part of the combination valve has the oil supplementing function, and under the condition that the oil way A14 or the oil way B15 is overloaded, the oil way B15 or the oil way A14 can complete oil supplementing through the oil way TB26, the oil way BC22, the oil way B15 or the oil way TA25, the oil way AC21 and the oil way A14 under the oil return resistance.
When the oil port P communicates with the oil passage a14, the oil passage communicating with the oil passage a14 compresses the right spring of the shuttle valve core 31 through the shuttle valve core 31 and opens the right hydraulic lock to complete the functional action. When the oil port P passes through the oil passage B15, the oil passage B15 compresses the spring through the shuttle valve core 31 and opens the left hydraulic lock to complete the functional action.
When the main valve rod 13 is in the middle position, the oil passage AP23 and the oil passage AC21 are not communicated, the oil passage BP24 and the oil passage BC22 are not communicated, the oil passage AC21 and the oil passage TA25 are opened, the oil passage BC22 and the oil passage TB26 are opened, and the shuttle valve core 31 is not operated due to the equality of the left and right hydraulic pressures, so that the oil passage a14 and the oil passage B15 of the system are in a locking state. If overload condition exists in the oil path A14 or the oil path B15, the oil path A14 or the oil path B15 passes through the built-in overflow valves on the two sides, and overload hydraulic oil enters the oil tank through the port of the oil path TA25 or the port of the oil path TB 26. Meanwhile, the corresponding hydraulic lock of the oil way B15 or the oil way A14 can reversely open the corresponding check valve in the hydraulic lock under the action of the oil return resistance Pt, and oil supplementing is realized through the oil passage Tb26→the oil passage B22→the oil way B15 or the oil passage Ta25→the oil passage AC21→the oil way A14. As shown in fig. 3, that is, the oil path a14 is overloaded, the built-in overload relief valve on the side of the oil path a14 is opened, and overload hydraulic oil enters the oil tank through the oil path TA 25; meanwhile, the one-way valve at the side of the oil path B15 is opened, and the oil pressure is supplemented through the oil path TB26, the oil path BC22 and the oil path B15. Arrows in fig. 3 indicate overflow and oil-make-up paths.
When the main valve rod 13 moves rightwards, the oil passage AP23 and the oil passage AC21 are opened, and the oil pressure of the oil inlet P12 passes through the oil passage AP23, the main valve hole, the oil passage AC21, the one-way valve and reaches the oil passage A14 to supply oil for the oil passage A14; meanwhile, because the oil pressure at the side of the oil passage AC21 is greater than that at the side of the oil passage BC22, the shuttle valve core 31 moves rightwards, the right one-way valve is opened, and the oil pressure of the oil passage B15 passes through the oil passage B15→the one-way valve→the oil passage BC22→the main valve hole→the oil passage TB26 to return to the oil tank.
When the main valve rod 13 moves leftwards, the oil passage BP24 and the oil passage BC22 are opened, and the oil pressure of the oil inlet P12 passes through the oil passage BP24, the main valve hole, the oil passage BC22, the one-way valve and reaches the oil passage B15 to supply oil for the oil passage B15; meanwhile, because the oil pressure at the side of the oil passage BC22 is greater than that at the side of the oil passage AC21, the shuttle valve core 31 moves leftwards, the left one-way valve is opened, and the oil pressure of the oil passage A14 passes through the oil passage A14, the one-way valve, the oil passage AC21, the main valve hole and the oil passage TA25 to return to the oil tank.
The innovation point of the technical scheme is that:
1. the structure design of the threaded cartridge hydraulic lock with overload and oil supplementing functions is that an overload valve, a hydraulic lock and an oil supplementing valve are coaxially arranged, the outer end of the overload valve is provided with the overload valve, and the insertion end of the cartridge valve is provided with the hydraulic lock with the oil supplementing function.
2. In the structure of the multi-way valve, three oil ways in the vertical direction on the axis of the overload oil supplementing hydraulic lock and the overload hydraulic lock form an overload oil supplementing hydraulic lock structure, a single overload oil supplementing hydraulic lock is arranged on the left side or the right side of the multi-way valve, three oil ways form an overload oil supplementing hydraulic lock loop, and a double overload oil supplementing hydraulic lock is provided with an overload oil supplementing hydraulic lock oil way formed by a group of three oil ways on two sides of the multi-way valve.
3. In the invention, the spring stiffness of the overload valve is very high, and the overload valve adopts a small overload flow surface and a valve core guiding structure, thereby realizing zero leakage in a hydraulic locking state.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (2)
1. The utility model provides a multiway valve based on coaxial integrated has with body oil filling and overload function hydraulic lock, includes the main valve body, be provided with oil inlet P and oil return port T on the main valve body, be provided with the main valve opening in the main valve body, install the main valve rod in the main valve opening, its characterized in that: the main valve body at one side of the main valve rod is provided with a shuttle valve hole, a shuttle valve core is arranged in the shuttle valve hole, the main valve body is provided with an oil way A and an oil way B which are communicated with the shuttle valve hole, and the oil way A and the oil way B are positioned at two ends of the same side of the shuttle valve core; an oil duct AC and an oil duct BC are arranged between the shuttle valve hole and the main valve hole at two ends of the shuttle valve core, an oil duct AP and an oil duct BP are sequentially communicated with the main valve hole between the oil duct AC and the oil duct BC, and the oil duct AP and the oil duct BP are communicated with the oil inlet P; an oil duct TA is arranged between the main valve hole and the shuttle valve hole outside the oil duct AC, and an oil duct TB is arranged between the main valve hole and the shuttle valve hole outside the oil duct BC;
A one-way overflow combination valve is arranged in the shuttle valve hole at the outer side of one end of the shuttle valve core in a sealing way, and a one-way overflow combination valve or a sealing end cover is arranged in the shuttle valve hole at the outer side of the other end of the shuttle valve core in a sealing way;
The one-way overflow combined valve comprises a combined valve body, one end of the combined valve body extends into the shuttle valve hole, and a coaxial one-way valve and an overflow valve are arranged in the combined valve body;
The one-way valve comprises a one-way valve core arranged in the combined valve body, the end part of the shuttle valve core stretches into the combined valve body and is close to the one-way valve core, a one-way valve seat is arranged in the combined valve body outside the one-way valve core, and a one-way valve return spring is arranged between the one-way valve core and the one-way valve seat; the combined valve body is provided with an oil passing hole a for communicating the oil passage AC with the oil inlet end of the one-way valve, and is also provided with an oil passing hole b for communicating the oil passage A with the oil outlet end of the one-way valve cavity; an inner cavity facing the opening of the check valve return spring is arranged in the check valve core, one end of the check valve return spring is abutted against the check valve seat, and the other end of the check valve return spring extends into the inner cavity of the check valve core;
The one-way valve seat is also used as a cone valve seat of the overflow valve, a cone valve hole communicated with the inner cavity of the valve core of the one-way valve is arranged in the cone valve seat, a cone valve core with one end extending into the cone valve hole is arranged in the combined valve body at the outer side of the cone valve seat, a plug is arranged at the opening end of the combined valve body in a sealing manner, and an overflow return spring is arranged between the cone valve core and the plug; an overflow cavity is arranged between the cone valve seat and the plug, and an overflow hole which is communicated with the overflow cavity and the oil duct TA is arranged on the combined valve body.
2. The multi-way valve with the integrated oil supplementing and overload function hydraulic lock based on the coaxial integration as claimed in claim 1, wherein: the shuttle valve hole is arranged in parallel with the main valve hole, and the shuttle valve core is arranged in parallel with the main valve rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910081475.0A CN109764019B (en) | 2019-01-28 | 2019-01-28 | Multi-way valve with integrated oil supplementing and overload hydraulic lock based on coaxial integration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910081475.0A CN109764019B (en) | 2019-01-28 | 2019-01-28 | Multi-way valve with integrated oil supplementing and overload hydraulic lock based on coaxial integration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109764019A CN109764019A (en) | 2019-05-17 |
| CN109764019B true CN109764019B (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910081475.0A Active CN109764019B (en) | 2019-01-28 | 2019-01-28 | Multi-way valve with integrated oil supplementing and overload hydraulic lock based on coaxial integration |
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| Country | Link |
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| CN (1) | CN109764019B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864267B (en) * | 2021-09-10 | 2024-02-23 | 日照海卓液压有限公司 | Modularized steady-state closing proportional throttling one-way and overload overflow multiple leak-free system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19630261A1 (en) * | 1996-07-26 | 1998-01-29 | Bosch Gmbh Robert | Overload valve for multi=circuit safety valve in vehicle air brakes |
| CN1560480A (en) * | 2004-03-08 | 2005-01-05 | 尚继良 | Integrated manual multiple directional control valve for lader |
| CN201786797U (en) * | 2010-09-30 | 2011-04-06 | 李金海 | Excavator load sensitive pressure compensation multi-way valve |
| CN102444636A (en) * | 2010-09-30 | 2012-05-09 | 李金海 | Load sensitive pressure compensation multiway valve for excavator |
| CN209838812U (en) * | 2019-01-28 | 2019-12-24 | 日照海卓液压有限公司 | Multi-way valve based on coaxial integration and provided with hydraulic lock with oil supplementing and overload functions in same body |
-
2019
- 2019-01-28 CN CN201910081475.0A patent/CN109764019B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19630261A1 (en) * | 1996-07-26 | 1998-01-29 | Bosch Gmbh Robert | Overload valve for multi=circuit safety valve in vehicle air brakes |
| CN1560480A (en) * | 2004-03-08 | 2005-01-05 | 尚继良 | Integrated manual multiple directional control valve for lader |
| CN201786797U (en) * | 2010-09-30 | 2011-04-06 | 李金海 | Excavator load sensitive pressure compensation multi-way valve |
| CN102444636A (en) * | 2010-09-30 | 2012-05-09 | 李金海 | Load sensitive pressure compensation multiway valve for excavator |
| CN209838812U (en) * | 2019-01-28 | 2019-12-24 | 日照海卓液压有限公司 | Multi-way valve based on coaxial integration and provided with hydraulic lock with oil supplementing and overload functions in same body |
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| CN109764019A (en) | 2019-05-17 |
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