CN210423210U - Oil circuit selection valve suitable for auxiliary sub-hydraulic system oil inlet and return selection - Google Patents
Oil circuit selection valve suitable for auxiliary sub-hydraulic system oil inlet and return selection Download PDFInfo
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- CN210423210U CN210423210U CN201921109729.7U CN201921109729U CN210423210U CN 210423210 U CN210423210 U CN 210423210U CN 201921109729 U CN201921109729 U CN 201921109729U CN 210423210 U CN210423210 U CN 210423210U
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Abstract
An oil circuit selection valve suitable for oil inlet and return selection of an auxiliary sub-hydraulic system is used as an oil supply circuit direction selection of the auxiliary sub-hydraulic system and is connected between the auxiliary sub-hydraulic system and a main hydraulic system through a corresponding oil circuit; the oil way selection valve comprises check valves I, II, III and IV, wherein the opening directions of the check valve I and the check valve II are opposite, and the opening directions of the check valve III and the check valve IV are opposite; an inlet a1 of the check valve I is connected with an outlet b2 of the check valve II, and an oil way port after connection is an A2 port; an outlet b1 of the check valve I is connected with an outlet b3 of the check valve III, and the port of the oil way after connection is a P2 port; an inlet a2 of the check valve II is connected with an inlet a4 of the check valve IV, the connected oil circuit port is a T2 port, an inlet a3 of the check valve III is connected with an outlet B4 of the check valve IV, and the connected oil circuit port is a B2 port; the port A2 and the port B2 are communicated with the port A1 and the port B1 of the main multi-way valve; the port P2 and the port T2 are communicated with an oil inlet P3 and an oil return port T3 of the auxiliary multi-way valve.
Description
Technical Field
The utility model relates to an engineering machine tool hydraulic control technical field, in particular to oil circuit selection valve suitable for it selects to advance to return oil in supplementary sub-hydraulic system in main hydraulic system.
Background
Along with the development of engineering machinery multifunctionality, people have more and more outstanding requirements on one machine with multiple functions, and in order to meet the requirements on one machine with multiple functions of the engineering machinery, other auxiliary functions are often required to be added to the existing engineering machinery products according to the requirements of customers on the premise of not influencing the main working performance of the products. For the hydraulic control system, an auxiliary sub-hydraulic system needs to be added to the main hydraulic system to meet the requirement of the auxiliary function. In the prior art, the principle of the main hydraulic system with the auxiliary sub-hydraulic system is shown in fig. 1, a working oil port of a main multi-way valve 2 in the main hydraulic system 1 is used as oil inlet and return of an auxiliary sub-hydraulic system 4, so as to meet the requirement of an auxiliary function, and the specific implementation method is as follows:
an oil inlet P3 of an auxiliary multi-way valve 5 in an auxiliary sub-hydraulic system 4 is connected with an oil outlet A1 of a main multi-way valve 2 in a main hydraulic system 1, an oil return port T3 of the auxiliary multi-way valve 5 is connected with an oil outlet B1 of the main multi-way valve 2, when the auxiliary sub-hydraulic system 4 needs to work, firstly, a reversing valve electromagnet DT2 in the main multi-way valve 2 is controlled to be electrified and reversed, an A1 port of the main multi-way valve 2 is communicated with an oil inlet P1, a B1 port is communicated with an oil return port T1, then, a reversing valve electromagnet DT3 in the auxiliary multi-way valve 5 is controlled to be electrified and reversed, an oil inlet P3 is communicated with an A3 port, an oil return port T3 is communicated with a B3 port, at the moment, an oil source of the main hydraulic system 1 passes through an oil inlet P1 of the main multi-way valve 2, an A1 port of the main multi-way valve 2, an oil inlet P3 port of the auxiliary multi-way valve, the small cavity oil of the hydraulic oil cylinder 6 returns to the oil return path of the main hydraulic system 1 through a port B3 of the auxiliary multi-way valve 5, an oil return port T3 of the auxiliary multi-way valve 5, a port B1 of the main multi-way valve 2 and an oil return port T1 of the main multi-way valve 2. Although the auxiliary sub-hydraulic system 4 of the prior art is capable of satisfying the auxiliary function action, the following two situations cannot be avoided:
(1) when the main multi-way valve 2 is controlled to change direction, misoperation is carried out, a change valve electromagnet DT1 in the main multi-way valve 2 is electrified and changes direction, at the moment, a port B1 of the main multi-way valve 2 is communicated with an oil inlet P1, a port A1 is communicated with an oil return port T1, an oil source of a main hydraulic system 1 is communicated with an oil return port T3 of an auxiliary multi-way valve 5 through an oil inlet P1 of the main multi-way valve 2 and a port B1 of the main multi-way valve 2, and an oil inlet P3 of the auxiliary multi-way valve 5 is communicated with the oil return port T1 through a port A1 of the main multi.
(2) The reversing operation of the main multi-way valve 2 is controlled to be correct, so that the electromagnet DT2 of the reversing valve is electrified, the port A1 of the main multi-way valve 2 is communicated with the oil inlet P1, the port B1 is communicated with the oil return port T1, but the connection is incorrect when pipelines between A1 ports, B1 ports and P3 ports and T3 are correspondingly connected, namely the port A1 is connected with the port T3, the port B1 is connected with the port P3, an oil source of the main hydraulic system 1 is connected to the oil return port T3 of the auxiliary multi-way valve 5 through the oil inlet P1 of the main multi-way valve 2 and the port A1 of the main multi-way valve 2, and the oil inlet 63P 23 of the auxiliary multi-way valve 5 is communicated with the oil return port T1 of the.
The two situations described above cause the auxiliary sub-hydraulic system 4 to suffer from three problems:
(1) an oil inlet P3 of the auxiliary multi-way valve 5 is communicated with an oil return circuit of the main hydraulic system 1, and the action of an auxiliary function cannot be realized.
(2) The maximum pressure resistance of an oil return port of the multi-way valve is generally less than 5MPa, but a T3 port of the auxiliary multi-way valve 5 is communicated with an oil source of the main hydraulic system 1, the main hydraulic system is generally a medium-high pressure system, the system pressure is not less than 16MPa, and the auxiliary multi-way valve 5 is easily damaged.
(3) As shown in figure 1, the middle position function of the auxiliary multi-way valve 5 is that a T3 port is communicated with a large cavity and a small cavity of a hydraulic oil cylinder 6, and because a T3 port is communicated with an oil source of a main hydraulic system 1, the oil source of the main hydraulic system 1 is output to the large cavity and the small cavity of the hydraulic oil cylinder 6 through the auxiliary multi-way valve 4, so that the hydraulic oil cylinder 6 automatically acts, auxiliary devices are damaged, and even personnel injury occurs in severe cases.
Disclosure of Invention
The utility model aims at providing an oil circuit selection valve suitable for supplementary sub-hydraulic system advances oil return selection just to the weak point that exists among the above-mentioned prior art.
The purpose of the utility model can be realized by the following technical measures:
the oil circuit selection valve suitable for oil inlet and return selection of the auxiliary sub-hydraulic system is used as the direction selection of the oil supply circuit of the auxiliary sub-hydraulic system and is connected between the auxiliary sub-hydraulic system and the main hydraulic system through the corresponding oil circuit; the oil way selection valve comprises a one-way valve I, a one-way valve II, a one-way valve III and a one-way valve IV, wherein the opening directions of the one-way valve I and the one-way valve II are opposite, and the opening directions of the one-way valve III and the one-way valve IV are opposite; an inlet a1 of the check valve I is connected with an outlet b2 of the check valve II, and an oil way port after connection is an A2 port; an outlet b1 of the check valve I is connected with an outlet b3 of the check valve III, and the port of the oil way after connection is a P2 port; an inlet a2 of the check valve II is connected with an inlet a4 of the check valve IV, the connected oil circuit port is a T2 port, an inlet a3 of the check valve III is connected with an outlet B4 of the check valve IV, and the connected oil circuit port is a B2 port; the port A2 is communicated with a port A1 of a main multi-way valve 2 of a main hydraulic system 1 through an oil circuit, and the port B2 is communicated with a port B1 of the main multi-way valve of the main hydraulic system through the oil circuit; the port P2 is communicated with an oil inlet P3 of an auxiliary multi-way valve in an auxiliary sub hydraulic system through an oil path, and the port T2 is communicated with an oil return port T3 of the auxiliary multi-way valve in the auxiliary sub hydraulic system through the oil path.
The utility model discloses no matter be from A2 mouthful oil feed B2 mouthful oil-out, still from B2 mouthful oil feed A2 mouthful oil-out, the homoenergetic makes fluid by P2 mouthful output, T2 mouthful oil return.
The utility model discloses an oil circuit selection valve is under the supplementary sub-hydraulic system's of additional condition to the oil inlet and return of sub-hydraulic system selects the use as supplementary.
More specifically: the utility model discloses an oil circuit selection valve sets up between auxiliary hydraulic system and main hydraulic system, and the oil circuit selection valve selects the use as the oil supply oil circuit direction of auxiliary hydraulic system, and the A2 mouth of oil circuit selection valve is linked together through the oil circuit with the A1 mouth of the main multiple unit valve of main hydraulic system, and the B2 mouth is linked together through the oil circuit with the B1 mouth of the main multiple unit valve of main hydraulic system; a port P2 of the oil path selection valve is communicated with an oil inlet P3 of an auxiliary multi-way valve in an auxiliary sub-hydraulic system through an oil path, and a port T2 of the oil path selection valve is communicated with an oil return port T3 of the auxiliary multi-way valve in the auxiliary sub-hydraulic system through an oil path. No matter the oil is returned from the port A1 of the main multi-way valve and the port B1, or the oil is returned from the port B1 of the main multi-way valve and the port A1, or the ports A1 and B1 of the main multi-way valve are correspondingly connected with the ports A2 and B2 of the oil way selector valve, or the ports A1 and B1 of the main multi-way valve are correspondingly connected with the ports B2 and A2 of the oil way selector valve, the oil way selector valve can ensure that the oil source of the main hydraulic system enters the oil inlet oil way of the auxiliary sub hydraulic system through the port P2 of the oil way selector valve 3, and the return oil of the auxiliary sub hydraulic system returns to the oil return oil way of the main hydraulic system from the port T2 of the oil.
The utility model has the advantages as follows:
through the oil circuit selection valve added between the auxiliary sub-hydraulic system and the main hydraulic system, no matter misoperation occurs when the main multi-way valve is reversed, or incorrect connection occurs when pipelines between A1, B1, P2 and T2 are correspondingly connected, the oil inlet P3 of the auxiliary multi-way valve in the auxiliary sub-hydraulic system can be ensured to be communicated with an oil supply source of the main hydraulic system, the oil return port T3 is communicated with an oil return circuit of the main hydraulic system, the reliable work of the auxiliary sub-hydraulic system is ensured, the auxiliary multi-way valve is prevented from being damaged due to high-pressure impact of the oil return port T3, and the damage to equipment and the injury to personnel caused by automatic actions of auxiliary functions are avoided.
Drawings
FIG. 1 is a schematic diagram of a prior art additional auxiliary sub-hydraulic system in a main hydraulic system.
The sequence numbers in fig. 1 are: the hydraulic system comprises a main hydraulic system 1, a main multi-way valve 2, an auxiliary hydraulic system 4, an auxiliary multi-way valve 5 and a hydraulic oil cylinder 6.
Fig. 2 is an application schematic diagram of an oil path selection valve suitable for assisting the selection of an oil supply source of a sub-hydraulic system.
The sequence numbers in fig. 2 are: the hydraulic system comprises a main hydraulic system 1, a main multi-way valve 2, an oil way selection valve 3, a check valve I3-1, a check valve II 3-2, a check valve III 3-3, a check valve IV 3-4, an auxiliary hydraulic system 4, an auxiliary multi-way valve 5 and a hydraulic oil cylinder 6.
Detailed Description
The invention will be further described with reference to the following examples (drawings):
as shown in fig. 2, the oil path selector valve 3 for selecting the oil inlet and the oil return of the auxiliary sub-hydraulic system of the present invention is used as the direction of the oil supply path of the auxiliary sub-hydraulic system 4, and is connected between the auxiliary sub-hydraulic system 4 and the main hydraulic system 1 through the corresponding oil path; the oil way selector valve 3 comprises a one-way valve I3-1, a one-way valve II 3-2, a one-way valve III 3-3 and a one-way valve IV 3-4, wherein the opening direction of the one-way valve I3-1 is opposite to that of the one-way valve II 3-2, and the opening direction of the one-way valve III 3-3 is opposite to that of the one-way valve IV 3-4; an inlet a1 of the check valve I3-1 is connected with an outlet b2 of the check valve II 3-2, and an oil way port after connection is an A2 port; an outlet b1 of the check valve I3-1 is connected with an outlet b3 of the check valve III 3-3, and the port of the oil circuit after connection is a P2 port; an inlet a2 of the check valve II 3-2 is connected with an inlet a4 of the check valve IV 3-4, the connected oil path port is a T2 port, an inlet a3 of the check valve III 3-3 is connected with an outlet B4 of the check valve IV 3-4, and the connected oil path port is a B2 port; the port A2 is communicated with a port A1 of a main multi-way valve 2 of the main hydraulic system 1 through an oil circuit, and the port B2 is communicated with a port B1 of the main multi-way valve 2 of the main hydraulic system 1 through an oil circuit; the port P2 is communicated with an oil inlet P3 of an auxiliary multi-way valve 5 in the auxiliary sub hydraulic system 4 through an oil path, and the port T2 is communicated with an oil return port T3 of the auxiliary multi-way valve 5 in the auxiliary sub hydraulic system 4 through an oil path.
In the main hydraulic system 1, the oil path connection relationship between the oil inlet P1 and the oil return port T1 of the main multi-way valve and the ports a2 and B2 of the oil path selector valve 3 is divided into the following four conditions:
(1) when the change valve electromagnet DT2 in the main multi-way valve 2 is electrified, the port A1 of the main multi-way valve 2 is communicated with the oil inlet P1, the port B1 is communicated with the oil return port T1, if the ports A1 and B1 of the main multi-way valve 2 are correspondingly connected with the ports A2 and B2 of the oil way selector valve 3, the oil inlet P1 of the main multi-way valve 2 is communicated with the port A2 of the oil source selector valve 3 through the port A1, and the oil return port T1 of the main multi-way valve 2 is communicated with the port B2 of the oil source selector valve 3 through the port B1.
(2) When the change valve electromagnet DT2 in the main multi-way valve 2 is electrified, the port A1 of the main multi-way valve 2 is communicated with the oil inlet P1, the port B1 is communicated with the oil return port T1, if the ports A1 and B1 of the main multi-way valve 2 are correspondingly connected with the ports B2 and A2 of the oil way selector valve 3, the oil inlet P1 of the main multi-way valve 2 is communicated with the port B2 of the oil source selector valve 3 through the port A1, and the oil return port T1 of the main multi-way valve 2 is communicated with the port B2 of the oil source selector valve 3 through the port B1.
(3) When the change valve electromagnet DT1 in the main multi-way valve 2 is electrified, the port B1 of the main multi-way valve 2 is communicated with the oil inlet P1, the port A1 is communicated with the oil return port T1, if the ports A1 and B1 of the main multi-way valve 2 are correspondingly connected with the ports A2 and B2 of the oil way selector valve 3, the oil inlet P1 of the main multi-way valve 2 is communicated with the port B2 of the oil source selector valve 3 through the port B1, and the oil return port T1 of the main multi-way valve 2 is communicated with the port A2 of the oil source selector valve 3 through the port A1.
(4) When the change valve electromagnet DT1 in the main multi-way valve 2 is electrified, the port B1 of the main multi-way valve 2 is communicated with the oil inlet P1, the port A1 is communicated with the oil return port T1, if the ports A1 and B1 of the main multi-way valve 2 are correspondingly connected with the ports B2 and A2 of the oil way selector valve 3, the oil inlet P1 of the main multi-way valve 2 is communicated with the port A2 of the oil source selector valve 3 through the port B1, and the oil return port T1 of the main multi-way valve 2 is communicated with the port B2 of the oil source selector valve 3 through the port A1.
Through above-mentioned condition analysis, total two kinds of intercommunication circumstances between main multiple unit valve oil inlet P1, oil return T1 and oil circuit selection valve 3's A2, B2 mouth in main hydraulic system 1, following to these two kinds of intercommunication circumstances, right the utility model discloses an oil circuit selection valve 3 applied principle suitable for supplementary sub-hydraulic system fuel feeding oil source selection carries out the analysis as follows:
(1) an oil inlet P1 of the main multi-way valve 2 is communicated with an A2 port of the oil source selector valve 3, and an oil return port T1 of the main multi-way valve 2 is communicated with a B2 port of the oil source selector valve 3. When the auxiliary function needs to act, the electromagnet DT3 of the reversing valve in the auxiliary multi-way valve 5 is controlled to be electrified and reversed, the port P3 of the oil inlet is communicated with the port A3, and the port T3 of the oil return port is communicated with the port B3. An oil source of a main hydraulic system 1 is connected to an A2 port of an oil source selection valve 3 through an oil inlet P1 of a main multi-way valve 2, pressure oil of an A2 port is divided into two paths in the oil source selection valve 3, one path is connected to a b2 port of a one-way valve II 3-2, but due to the one-way stopping function of the one-way valve II 3-2, the pressure oil cannot flow to a2 port from a b2 port of the one-way valve II 3-2, the oil path is stopped at a b2 port of the one-way valve 3-2, the other path is connected to an a1 port of the one-way valve I3-1, the one-way valve I3-1 is opened and is connected to a b1 port of the one-way valve I3-1, the pressure oil of the b1 port is divided into two paths, one path is connected to a b3 port of the one-way valve III-3, but due to the one-way stopping function of the one-3, the pressure oil cannot flow to a b3 port of the one-3, the other path is connected to a port P2 of an oil path selector valve 3, pressure oil output from a port P2 is connected to a large cavity of a hydraulic oil cylinder 6 through an oil inlet P3 of an auxiliary multi-way valve 5 and a port A3 of the auxiliary multi-way valve, the hydraulic oil cylinder 6 extends out and realizes corresponding auxiliary function actions, oil output from a small cavity of the hydraulic oil cylinder 6 is connected to a port B3 of the auxiliary multi-way valve 5 and an oil return port T3 of the auxiliary multi-way valve 5 through a port T2 of the oil path selector valve, oil at the port T2 is divided into two paths inside the oil source selector valve 3, one path is connected to a port a2 of a one-way valve II 3-2, but because a port B2 of the one-way valve II 3-2 is connected with high-pressure oil of a system, the pressure at a port B2 is far greater than the pressure at a2, the other one-way valve II 3-2 cannot be opened, the oil path is stopped at a port a2 port a of the one-2, the oil path is connected to a port, the oil at the port B4 is divided into two paths in the oil source selection valve 3, one path is connected to the port a3 of the one-way valve III 3-3, but because the port B3 of the one-way valve III 3-3 is connected with the high-pressure oil inlet of the system, the pressure at the port B3 is far greater than the pressure at the port a3, the one-way valve III 3-3 can not be opened, the oil path is cut off at the port a3 of the one-way valve III 3-3, the other path is connected to the port B2 of the oil path selection valve 3, because the port B2 is communicated with the oil return port T1 of the main multi-way valve 2, the oil at the port B2 is directly returned to.
(2) An oil inlet P1 of the main multi-way valve 2 is communicated with a port B2 of the oil source selector valve 3, and an oil return port T1 of the main multi-way valve 2 is communicated with a port A2 of the oil source selector valve 3. When the auxiliary function needs to act, the electromagnet DT3 of the reversing valve in the auxiliary multi-way valve 5 is controlled to be electrified and reversed, the P3 port of the oil inlet is communicated with the A3 port, and the T3 port of the oil return port is communicated with the B3 port. The oil output from the oil source of the main hydraulic system 1 is connected to a port B2 of an oil source selector valve 3 through an oil inlet P1 of a main multi-way valve 2, the pressure oil at a port B2 is divided into two paths in the oil source selector valve 3, one path is connected to a port B4 of a one-way valve IV 3-4, but due to the one-way stopping function of the one-way valve IV 3-4, the pressure oil cannot flow to a port a4 from a port B4 of the one-way valve IV 3-4, the oil path is stopped at the port B4 of the one-way valve IV 3-4, the other path is connected to a port a3 of the one-way valve III 3-3, the pressure oil at the port B363 of the one-way valve III 3-3 is opened, the pressure oil at the port B3 of the one-way valve III 3-3 is divided into two paths, one path is connected to the port B1 of the one-way valve I3-1, but due to the one-way stopping function of the one-1, the pressure oil cannot flow to a port B1, the other path is connected to a port P2 of an oil path selector valve 3, pressure oil output from a port P2 is connected to a large cavity of a hydraulic oil cylinder 6 through an oil inlet P3 of an auxiliary multi-way valve 5 and a port A3 of the auxiliary multi-way valve, the hydraulic oil cylinder 6 extends out and realizes corresponding auxiliary function actions, oil output from a small cavity of the hydraulic oil cylinder 6 is connected to a port B3 of the auxiliary multi-way valve 5 and an oil return port T3 of the auxiliary multi-way valve 5 through a port T2 of the oil path selector valve, oil at the port T2 is divided into two paths inside the oil source selector valve 3, one path is connected to a port a4 of a one-way valve IV 3-4, but because a port B4 of the one-way valve IV 3-4 is connected with high-pressure oil of a system, the pressure at a port B4 is far greater than the pressure at a port a4, the other one-way valve IV 3-4 cannot be opened, the oil path is stopped at a port a4 port a of the one-way valve IV 3-4, the, the oil at the port b2 is divided into two paths in the oil source selector valve 3, one path is connected to the port a1 of the one-way valve I3-1, but because the port b1 of the one-way valve I3-1 is connected with the high-pressure oil inlet of the system, the pressure at the port b1 is far greater than the pressure at the port a1, the one-way valve I3-1 cannot be opened, the oil path is cut off at the port a1 of the one-way valve I3-1, the other path is connected to the port A2 of the oil path selector valve 3, because the port A2 is communicated with the oil return port T1 of the main multi-way valve 2, the oil at the port A2 is directly returned to the.
Compared with the prior art, the beneficial effects of the utility model are that:
no matter misoperation occurs when the main multi-way valve 2 is reversed, or incorrect connection is performed when pipelines between A1 and B1 and pipelines between P2 and T2 are correspondingly connected, the oil inlet P3 of the auxiliary multi-way valve 5 in the auxiliary sub-hydraulic system 4 can be ensured to be communicated with an oil supply source of the main hydraulic system 1, the oil return port T3 is communicated with an oil return circuit of the main hydraulic system 1, reliable work of the auxiliary sub-hydraulic system 4 is ensured, the auxiliary multi-way valve 5 is prevented from being damaged due to high-pressure impact of the oil return port T3, and damage to equipment and injury to personnel caused by automatic actions of auxiliary functions are avoided.
Claims (1)
1. The utility model provides an oil circuit selection valve suitable for supplementary sub-hydraulic system advances oil return and selects which characterized in that: the oil circuit selection valve is used for selecting the direction of an oil supply circuit of the auxiliary sub-hydraulic system and is connected between the auxiliary sub-hydraulic system and the main hydraulic system through a corresponding oil circuit; the oil way selection valve comprises a one-way valve I, a one-way valve II, a one-way valve III and a one-way valve IV, wherein the opening directions of the one-way valve I and the one-way valve II are opposite, and the opening directions of the one-way valve III and the one-way valve IV are opposite; an inlet a1 of the check valve I is connected with an outlet b2 of the check valve II, and an oil way port after connection is an A2 port; an outlet b1 of the check valve I is connected with an outlet b3 of the check valve III, and the port of the oil way after connection is a P2 port; an inlet a2 of the check valve II is connected with an inlet a4 of the check valve IV, the connected oil circuit port is a T2 port, an inlet a3 of the check valve III is connected with an outlet B4 of the check valve IV, and the connected oil circuit port is a B2 port; the port A2 is communicated with a port A1 of a main multi-way valve (2) of a main hydraulic system (1) through an oil circuit, and the port B2 is communicated with a port B1 of the main multi-way valve of the main hydraulic system through an oil circuit; the port P2 is communicated with an oil inlet P3 of an auxiliary multi-way valve in an auxiliary sub hydraulic system through an oil path, and the port T2 is communicated with an oil return port T3 of the auxiliary multi-way valve in the auxiliary sub hydraulic system through the oil path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921109729.7U CN210423210U (en) | 2019-07-16 | 2019-07-16 | Oil circuit selection valve suitable for auxiliary sub-hydraulic system oil inlet and return selection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921109729.7U CN210423210U (en) | 2019-07-16 | 2019-07-16 | Oil circuit selection valve suitable for auxiliary sub-hydraulic system oil inlet and return selection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210423210U true CN210423210U (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921109729.7U Active CN210423210U (en) | 2019-07-16 | 2019-07-16 | Oil circuit selection valve suitable for auxiliary sub-hydraulic system oil inlet and return selection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210423210U (en) |
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2019
- 2019-07-16 CN CN201921109729.7U patent/CN210423210U/en active Active
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