CN106194881B - Direction controlling valve group and hydraulic system - Google Patents
Direction controlling valve group and hydraulic system Download PDFInfo
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- CN106194881B CN106194881B CN201610835087.3A CN201610835087A CN106194881B CN 106194881 B CN106194881 B CN 106194881B CN 201610835087 A CN201610835087 A CN 201610835087A CN 106194881 B CN106194881 B CN 106194881B
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- valve
- oil circuit
- oil
- executive component
- hydraulic fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention discloses a kind of direction controlling valve group and hydraulic systems, are related to Hydraulic Field, to the independent control of two executive components when realizing only one group of oil inlet pipe and oil return line, and portable construction.Direction control valve group includes the first valve and the second valve；First valve includes the first oil circuit and the second oil circuit；Second valve includes third oil circuit and the 4th oil circuit；Wherein, the first oil circuit can be connected to third oil circuit, and the second oil circuit and the 4th oil circuit can be connected to.Above-mentioned technical proposal can also control two executive components movements when only one group of oil inlet and oil return line respectively.The valve block and valve applied in entire valve group all can be hydraulic universal part, easy to produce, at low cost.
Description
Technical field
The present invention relates to Hydraulic Fields, and in particular to a kind of direction controlling valve group and hydraulic system.
Background technique
In the prior art, it if to use one group of oil inlet and oil return line, goes to control two executive component movements respectively, need
Two six logical Electromagnetic Control valve groups are used, principle is as shown in Figure 1.Two six energization magnetic control valve groups are mainly by one two
The logical solenoid valve in position six and corresponding valve block are composed.
This two six energization magnetic control valve groups include six hydraulic fluid ports: P1, P2, C1, C2, C3, C4.P2 hydraulic fluid port is as oil inlet
Mouthful, P1 hydraulic fluid port is as oil return opening.Hydraulic fluid port C4 connects the first executive component with C1, and hydraulic fluid port C3 connects the second executive component with C2.
Two six energization magnetic control valve group concrete principles are: if P2 into high pressure oil, P1 oil return, in electromagnet no power
When, the movement of the first executive component；When electromagnet is powered, the movement of the second executive component.
Inventors have found that at least there are following problems in the prior art: if hydraulic system only one group of oil inlet at present and returning
Oil pipe line is but needed to control two executive component movements respectively, is then had to using two six energization magnetic control valve groups.Two six logical
Electromagnetic Control valve group is special electromagnetic valve, is manufactured extremely difficult.
Summary of the invention
One of purpose of the invention is to propose a kind of direction controlling valve group and hydraulic system, to realize only one group
To the independent control of two executive components when oil inlet pipe and oil return line, and manufacture easy to process.
To achieve the above object, the present invention provides following technical schemes:
The present invention provides a kind of direction controlling valve groups, including the first valve and the second valve；First valve includes the first oil
Road and the second oil circuit；Second valve includes third oil circuit and the 4th oil circuit；Wherein, first oil circuit and the third oil circuit
It can be connected to, second oil circuit can be connected to the 4th oil circuit.
In an alternate embodiment of the invention, one of hydraulic fluid port of first oil circuit and second oil circuit shares.
In an alternate embodiment of the invention, one of hydraulic fluid port of the third oil circuit and the 4th oil circuit shares.
In an alternate embodiment of the invention, first valve includes two position four-way valves or two-position three-way valve.
In an alternate embodiment of the invention, second valve includes two position four-way valves or two-position three-way valve.
In an alternate embodiment of the invention, when first valve and second valve are all in power failure state, first oil circuit
It is simultaneously turned on the third oil circuit, and oil liquid can enter after the first executive component via first oil circuit through by the third
Oil circuit outflow, to realize the movement of first executive component.
In an alternate embodiment of the invention, when first valve and second valve are all in power failure state, first oil circuit
It is simultaneously turned on the third oil circuit, and oil liquid can enter after the first executive component via the third oil circuit through by described first
Oil circuit outflow, to realize the counteragent of first executive component.
In an alternate embodiment of the invention, when first valve and second valve all in electricity condition, second oil circuit
It is simultaneously turned on the 4th oil circuit, and oil liquid can enter after the second executive component via second oil circuit through by the described 4th
Oil circuit outflow, to realize the movement of second executive component.
In an alternate embodiment of the invention, when first valve and second valve all in electricity condition, second oil circuit
It is simultaneously turned on the 4th oil circuit, and oil liquid can enter after the second executive component via the 4th oil circuit through by described second
Oil circuit outflow, to realize the counteragent of second executive component.
The embodiment of the present invention also provides a kind of hydraulic system, including the first executive component, the second executive component and the present invention
Direction controlling valve group provided by any technical solution；
First executive component is set between first oil circuit and the third oil circuit, and second executive component is set
Between second oil circuit and the 4th oil circuit.
Based on the above-mentioned technical proposal, the embodiment of the present invention at least can produce following technical effect:
Oil liquid flow path is collectively formed using two individual valves, when need to use, by first in above-mentioned technical proposal
Executive component is arranged between the first oil circuit and third oil circuit, the setting of the second executive component the second oil circuit and the 4th oil circuit it
Between, can thus form two circuits: first circuit is the first oil circuit, the first executive component, third oil circuit；By this first
Circuit is able to achieve the control to the first executive component.Second circuit is the second oil circuit, the second executive component, the 4th oil circuit；It is logical
It crosses the second servo loop and is able to achieve control to the second executive component.As it can be seen that above-mentioned technical proposal, when only one group of oil inlet pipe and
Oil return line can also control two executive component movements respectively.The valve block and valve applied in entire valve group all can be hydraulic universal
Part, it is easy to produce, at low cost.In addition, the direction controlling valve group that above-mentioned technical proposal provides, portable construction, low in cost, performance
It is reliable and stable.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic illustration of two six three-way electromagnetic valve groups in the prior art；
Fig. 2 is direction controlling valve group schematic illustration provided in an embodiment of the present invention；
Fig. 3 is direction controlling valve group use state diagram provided in an embodiment of the present invention；
Fig. 4 is directional control valve overall structure diagram provided in an embodiment of the present invention.
Appended drawing reference: 1, the first valve；2, the second valve；3, the first executive component；4, the second executive component.
Specific embodiment
Technical solution provided by the invention is illustrated in more detail below with reference to Fig. 2~Fig. 4.
The technical term for needing to use in the present embodiment or explanation of nouns.
Valve block (or being valve body): it is provided with hydraulic oil port thereon, two position four-way solenoid valves are mounted thereon, have between the two
Corresponding sealing.By controlling the position of valve core of the electromagnetic valve, the control to hydraulic oil direction is realized.
Two position four-way solenoid valves: there are two operating positions, in solenoid valves, work in the machine close to electromagnet side
Energy；Otherwise, it works in the function of spring side, as shown in Figure 2.
Referring to fig. 2, the embodiment of the present invention provides a kind of direction controlling valve group, including the first valve 1 and the second valve 2.First valve
1 includes the first oil circuit and the second oil circuit；Second valve 2 includes third oil circuit and the 4th oil circuit.Wherein, the first oil circuit and third oil circuit
It can be connected to, the second oil circuit and the 4th oil circuit can be connected to.
First valve 1 can be two-bit triplet solenoid valve, two-bit triplet hand-operated valve, two position four-way solenoid valves, two four-way hands
Dynamic valve, above-mentioned valve can be board-like or plug-in.Second valve 2 can be two-bit triplet solenoid valve, two-bit triplet hand-operated valve, two
Position four-way solenoid valve, two four-way hand-operated valves, above-mentioned valve can be board-like or plug-in.
In the present embodiment, for using solenoid valve shown in Fig. 2, oil circuit of first oil circuit between hydraulic fluid port P1 and P3,
Oil circuit of second oil circuit between hydraulic fluid port P1 and P4.Oil circuit of the third oil circuit between hydraulic fluid port P5 and P7, the 4th oil circuit are hydraulic fluid port
Oil circuit between P5 and P8.
Oil liquid flow path is collectively formed using two individual valves, when need to use, by first in above-mentioned technical proposal
Executive component 3 is arranged between the first oil circuit and third oil circuit, the setting of the second executive component 4 the second oil circuit and the 4th oil circuit it
Between, can thus form two circuits: first circuit is the first oil circuit, the first executive component 3, third oil circuit.By this
Primary Ioops are able to achieve the control to the first executive component 3.Second circuit is the second oil circuit, the 4, the 4th oil of the second executive component
Road.The control to the second executive component 4 is able to achieve by the second servo loop.
First executive component 3 can be oil cylinder, hydraulic motor etc.；Second executive component 4 can be oil cylinder, hydraulic motor
Deng.
If the first executive component 3 be can bidirectional-movement oil cylinder, in the only hydraulic system of one group of oil inlet and oil return pipe,
The hydraulic fluid port P1 that first oil circuit is not connect with the first executive component 3 is connected to oil inlet pipe, third oil circuit not with the first executive component 3
The hydraulic fluid port P5 of connection is connect with oil return line, is able to achieve the movement of the first executive component 3, such as the stretching of oil cylinder in this way.If the
One executive component 3 is the element for capableing of counteragent, then the hydraulic fluid port P5 that third oil circuit is not connect with the first executive component 3 with into
Oil pipe line connection, the hydraulic fluid port P1 that the first oil circuit is not connect with the first executive component 3 is connect with oil return line is able to achieve the first execution
The counteragent of element 3, such as the retraction of oil cylinder.It in actual use, can be by into and out of oil pipe line and directional control valve
The mode of reversal valve is set between group to avoid replacing the position into and out of hydraulic fluid port, and can realize the double of the first executive component 3 simultaneously
To movement.
Similarly, if the second executive component 4 be can bidirectional-movement oil cylinder, there was only the hydraulic of one group of oil inlet and oil return pipe at this
In system, the hydraulic fluid port P1 that the second oil circuit is not connect with the first executive component 3 is connected to oil inlet pipe, and the 4th oil circuit is not with first
The hydraulic fluid port P5 that executive component 3 connects is connect with oil return line, is able to achieve the movement of the second executive component 4 in this way, such as oil cylinder
It stretches out.If the second executive component 4 is the element for capableing of counteragent, the oil that the 4th oil circuit is not connect with the second executive component 4
Mouth P5 is connected to oil inlet pipe, and the hydraulic fluid port P1 that the second oil circuit is not connect with the second executive component 4 is connect with oil return line to be able to achieve
The counteragent of second executive component 4, such as the retraction of oil cylinder.It in actual use, can be by into and out of oil pipe line and side
It avoids replacing the position into and out of hydraulic fluid port to the mode of reversal valve is arranged between control valve group, and can realize the second execution simultaneously
The bidirectional-movement of element 4.
For convenient for direction controlling valve group to be connected to oil inlet pipe or oil return line, the first oil circuit and the second oil circuit are wherein
One hydraulic fluid port shares, and i.e. hydraulic fluid port P1 is to share hydraulic fluid port in the present embodiment.
For convenient for direction controlling valve group to be connected to oil return line or oil inlet pipe, third oil circuit and the 4th oil circuit are wherein
One hydraulic fluid port shares, and i.e. hydraulic fluid port P5 is to share hydraulic fluid port in the present embodiment.
Herein, the first valve 1 includes two position four-way valves or two-position three-way valve.In the present embodiment, the first valve 1 is two four energizations
Magnet valve is specifically as follows board-like or plug-in.
Referring to fig. 2, the second valve 2 includes two position four-way valves or two-position three-way valve.In the present embodiment, the second valve 2 is two four
Three-way electromagnetic valve is specifically as follows board-like or plug-in.
Referring to fig. 2, when the first valve 1 and the second valve 2 are simultaneously turned on all in power failure state, the first oil circuit and third oil circuit,
And oil liquid can enter after the first executive component 3 via the first oil circuit through being flowed out by third oil circuit, to realize the first executive component 3
Movement.
Similarly, when the first valve 1 and the second valve 2 all in electricity condition, the second oil circuit and the 4th oil circuit simultaneously turn on, and oil
Liquid can enter after the second executive component 4 via the second oil circuit through being flowed out by the 4th oil circuit, to realize the dynamic of the second executive component 4
Make.
Hold it is above-mentioned, referring to figs. 2 and 3, the first valve 1 be two four-way electromagnetic control valves comprising hydraulic fluid port P1~P4；Hydraulic fluid port
P1 is connected to form the first oil circuit with hydraulic fluid port P3, and hydraulic fluid port P1 is connected to form the second oil circuit with hydraulic fluid port P4, hydraulic fluid port P2 connection fuel tank.Second
Valve 2 is two four-way electromagnetic control valves comprising hydraulic fluid port P5~P8.Hydraulic fluid port P5 is connected to form third oil circuit, hydraulic fluid port with hydraulic fluid port P7
P5 is connected to form the 4th oil circuit with hydraulic fluid port P8, hydraulic fluid port P6 connection fuel tank.The hydraulic fluid port a2 of first executive component 3 is connected to 1 oil of the first valve
The hydraulic fluid port b2 of mouth P3, the first executive component 3 are connected to 2 hydraulic fluid port P7 of the second valve.The hydraulic fluid port a1 of second executive component 4 is connected to the first valve 1
The hydraulic fluid port b1 of hydraulic fluid port P4, the second executive component 4 are connected to 2 hydraulic fluid port P8 of the second valve.
Under the premise of hydraulic fluid port P1 is into high pressure oil, hydraulic fluid port P5 oil return, if the first valve 1 and the second valve 2 power loss simultaneously, are able to achieve
The movement of first executive component 3, such as the stretching of the first executive component 3；Electric situation is obtained simultaneously in the first valve 1 and the second valve 2
Under, it is able to achieve the movement of the second executive component 4, such as the stretching of the second executive component 4.
If the first executive component 3 be can counteragent Hydraulic Elements, when the first valve 1 and the second valve 2 are all in power loss shape
State, the first oil circuit and third oil circuit simultaneously turn on, and oil liquid can enter after the first executive component 3 via third oil circuit through by first
Oil circuit outflow, to realize the counteragent of the first executive component 3.
If the second executive component 4 be can counteragent Hydraulic Elements, when the first valve 1 and the second valve 2 all in electric shape
State, the second oil circuit and the 4th oil circuit simultaneously turn on, and oil liquid can enter after the second executive component 4 via the 4th oil circuit through by second
Oil circuit outflow, to realize the counteragent of the second executive component 4.
Above content is explained in detail below, referring to Fig. 3, under the premise of hydraulic fluid port P5 is into high pressure oil, hydraulic fluid port P1 oil return, in the first valve
1 and second valve 2 simultaneously in the case where power loss, it is able to achieve the counteragent of the first executive component 3, such as the first executive component 3
Retraction.The first valve 1 and the second valve 2 simultaneously it is electric in the case where, be able to achieve the counteragent of the second executive component 4, such as the
The retraction of one executive component 3.
Above-mentioned technical proposal is realized in only one group of oil inlet and oil return line using two conventional valves to two executive components
Independent control, and direction controlling valve group does not include particular usage valve, compact-sized convenient for manufacture.
Referring to Fig. 3 and Fig. 4, the first above-mentioned valve 1 and the second valve 2 can be integrated in the same valve body, which is equipped with six
A hydraulic oil port, as shown in Figure 2 respectively A1~A3, B1~B3.First valve 1 and the second valve 2 are set to valve inner, especially by
Screw plug and mounting screw are connect with valve body.First valve 1 and the second valve 2 are all board-like two position four-way solenoid valve.The hydraulic fluid port of first valve 1
P1 is connected to hydraulic fluid port A3, and the hydraulic fluid port P5 of the second valve 2 is connected to B3, A3 and B3 one of them as oil inlet, another is used as back
Hydraulic fluid port.Hydraulic fluid port A1 is connected to 4 hydraulic fluid port a1 of 1 hydraulic fluid port P4 of the first valve and the second executive component, and hydraulic fluid port A2 is connected to 4 oil of the second executive component
Mouth b1 and the second valve 2 hydraulic fluid port P8, hydraulic fluid port B1 are connected to 3 hydraulic fluid port a2 of 1 hydraulic fluid port P3 of the first valve and the first executive component, and hydraulic fluid port B2 then connects
Logical 2 hydraulic fluid port P7 of first executive component, 3 hydraulic fluid port b2 and the second valve.
The direction controlling valve group that above-mentioned technical proposal provides, control principle are as follows: A3 mouthful oil inlets, B3 mouthfuls it is fuel-displaced when, it is logical
It crosses two solenoid valves of control to be powered simultaneously or no power, control A1 mouthfuls of fuel-displaced, A2/B3 mouthfuls of oil returns or B1 mouthfuls of fuel-displaced, B2/B3
Mouth oil return may be implemented to carry out selection independent control to two different actuator movements.
It is specific as follows:
If 1, A3 mouthfuls into high pressure oil, and the first valve 1 (i.e. solenoid valve CT1) and the second valve 2 (i.e. solenoid valve CT2) all must not
Electricity, at this point, high pressure oil flows to the entrance of the first executive component 3 by solenoid valve CT1, then oil return line by hydraulic fluid port A3 from B1 mouthfuls
By B2 mouthfuls from B3 mouthfuls of oil returns.At this point, only the first executive component 3 acts, 4 attonity of the second executive component.Second executive component
4 actuator port P2 are connected to T mouthfuls of oil return boxes.Second executive component, 4 working oil path through above solenoid valve A1 and A2 mouthfuls take back fuel tank.
Similarly, if B3 mouthfuls into high pressure oil, A3 mouthfuls of oil returns, 3 counteragent of the first executive component at this time.
2, if A3 mouthfuls into high pressure oil, and solenoid valve CT1 and the second valve solenoid valve CT2 all it is electric, at this point, high pressure oil is by hydraulic fluid port
A3 flows to the entrance of the second executive component 4 by solenoid valve CT1 from A1 mouthfuls, and then oil return line passes through A2 mouthfuls from B3 mouthfuls of oil returns.This
When, only the second executive component 4 acts, 3 attonity of the first executive component.Second valve, 2 actuator port P6 connects fuel tank.First executes
3 working oil path of element through above solenoid valve B1 and B2 mouthfuls take back fuel tank.Similarly, if B3 mouthfuls into high pressure oil, A3 mouthfuls of oil returns, at this time
Second executive component, 4 counteragent.
The directional control valve that above-mentioned technical proposal provides, by using board-like two position four-way valve two and valve block, composition
Directional control valve realizes the function of two six-way valve groups.It that is:, can be using direction control valve group in single hydraulic circuit
Single loop realizes the selection independent control to two executive components.Moreover, the valve group uses universaling electromagnetic valve, valve block processing side
Just, have production, manufacturing cost low, the features such as versatility is good, the manufacturing cycle is short.
The embodiment of the present invention also provides a kind of hydraulic system comprising the first executive component 3, the second executive component 4 and sheet
Invent the direction controlling valve group that any technical solution provides.First executive component 3 is set between the first oil circuit and third oil circuit, the
Two executive components 4 are set between the second oil circuit and the 4th oil circuit.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown is only the present invention and simplified description for ease of description, rather than indicates or imply signified device
Or element must have a particular orientation, construct and operate for specific orientation, thus should not be understood as in present invention protection
The limitation of appearance.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
But these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (7)
1. a kind of hydraulic system, which is characterized in that held including the first valve (1), the second valve (2), the first executive component (3) and second
Units (4)；First valve (1) includes the first oil circuit and the second oil circuit；Second valve (2) includes third oil circuit and the 4th
Oil circuit；Wherein, first oil circuit can be connected to the third oil circuit, and second oil circuit can be connected to the 4th oil circuit；
First executive component (3) is set between first oil circuit and the third oil circuit, and second executive component (4) is set to
Between second oil circuit and the 4th oil circuit；
One of hydraulic fluid port of first oil circuit and second oil circuit shares, the third oil circuit and the 4th oil circuit
One of hydraulic fluid port shares.
2. hydraulic system according to claim 1, which is characterized in that when first valve (1) and second valve (2) all
In power failure state, first oil circuit and the third oil circuit are simultaneously turned on, and oil liquid can enter via first oil circuit
First executive component (3) is flowed out by by the third oil circuit, to realize the movement of first executive component (3).
3. hydraulic system according to claim 1, which is characterized in that when first valve (1) and second valve (2) all
In power failure state, first oil circuit and the third oil circuit are simultaneously turned on, and oil liquid can enter via the third oil circuit
First executive component (3) is flowed out by by first oil circuit, to realize the counteragent of first executive component (3).
4. hydraulic system according to claim 1, which is characterized in that when first valve (1) and second valve (2) all
In electricity condition, second oil circuit and the 4th oil circuit simultaneously turn on, and oil liquid can enter via second oil circuit
Second executive component (4) is flowed out by by the 4th oil circuit, to realize the movement of second executive component (4).
5. hydraulic system according to claim 1, which is characterized in that when first valve (1) and second valve (2) all
In electricity condition, second oil circuit and the 4th oil circuit simultaneously turn on, and oil liquid can enter via the 4th oil circuit
Second executive component (4) is flowed out by by second oil circuit, to realize the counteragent of second executive component (4).
6. -5 any hydraulic system according to claim 1, which is characterized in that first valve (1) includes two four-ways
Valve or two-position three-way valve.
7. -5 any hydraulic system according to claim 1, which is characterized in that second valve (2) includes two four-ways
Valve or two-position three-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610835087.3A CN106194881B (en) | 2016-09-20 | 2016-09-20 | Direction controlling valve group and hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610835087.3A CN106194881B (en) | 2016-09-20 | 2016-09-20 | Direction controlling valve group and hydraulic system |
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| CN106194881B true CN106194881B (en) | 2019-01-25 |
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| CN108730256B (en) * | 2018-08-07 | 2023-12-15 | 徐州徐工基础工程机械有限公司 | Function switching electromagnetic valve group and hydraulic system |
| CN108953308B (en) * | 2018-09-12 | 2024-01-30 | 徐州徐工基础工程机械有限公司 | Extensible multifunctional electrohydraulic system and working method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5692427A (en) * | 1993-08-12 | 1997-12-02 | Komatsu Ltd. | Flow reinforcement directional control valve for a hydraulic circuit |
| CN201661532U (en) * | 2010-04-02 | 2010-12-01 | 北京华强京工机械制造有限公司 | Hydraulic pumping system of concrete pump |
| CN102562712A (en) * | 2012-02-17 | 2012-07-11 | 三一重工股份有限公司 | Engineering machinery, pumping mechanism thereof and pumping hydraulic oil replenishing system |
| CN203542853U (en) * | 2013-10-31 | 2014-04-16 | 永州恒丰机械有限公司 | Hydraulic feeding device of concrete mixer |
| CN104632748B (en) * | 2015-02-28 | 2017-06-09 | 中国船舶重工集团公司第七0四研究所 | Solar term low noise type valve high-speed switch pneumatic system |
| CN206129767U (en) * | 2016-09-20 | 2017-04-26 | 徐州徐工施维英机械有限公司 | Directional control valves and hydraulic system |
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