CN106438547A - Novel electro-hydraulic directional control valve - Google Patents
Novel electro-hydraulic directional control valve Download PDFInfo
- Publication number
- CN106438547A CN106438547A CN201610989217.9A CN201610989217A CN106438547A CN 106438547 A CN106438547 A CN 106438547A CN 201610989217 A CN201610989217 A CN 201610989217A CN 106438547 A CN106438547 A CN 106438547A
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- valve
- pilot valve
- main valve
- pilot
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Classifications
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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
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/085—Servomotor systems incorporating electrically operated control means using a data bus, e.g. "CANBUS"
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Servomotors (AREA)
Abstract
The invention discloses a novel electro-hydraulic directional control valve and belongs to the field of hydraulic valves. The novel electro-hydraulic directional control valve comprises a left pilot valve body, a right pilot valve body, a left main valve body, a right main valve body, a left pilot valve element drive device and a right pilot valve element drive device. The novel electro-hydraulic directional control valve is characterized in that a left main valve element and a right main valve element are independently controlled by the pilot valve bodies, the control precision is high, and the response speed is high; and in addition, the optical double-main-valve combined control scheme can be determined according to working conditions for practical use of a platform.
Description
Technical field
The present invention relates to hydraulic buttery valve technical field, particularly a kind of fast response time, control accuracy is high and controls
Pattern can separate configurations, the electro-hydraulic double spool reversal valve of flexible combination.
Background technology
Electro hydraulic valve, as a kind of important valve class of hydraulic drive and control system, is mainly made up of pilot valve and main valve,
Pilot valve is generally electromagnetic valve reversal valve, mainly passes through commutation control entrance main valve oil circuit, thus play vulnerabilities scan big flow,
The effect of big pressure.But general pilot valve is ordinary electromagnetic reversal valve, simple oil circuit commutation can only be played, cannot be to fluid
Pressure, flow play and are accurately controlled, if working conditions change, such as executive component need different movement velocitys, then need to use
Electro-hydraulic proportional valve is realizing.
Although electro-hydraulic proportional valve can carry out linear scale control to pressure and flow, proportion electro-magnet input current is big,
The shortcomings of high frequency response is slow.In recent years, the control effect in order to obtain, people with digital valve as pilot valve, thus developing
Become electrohydraulic digital valve.It can directly and computer enters line interface it is not necessary to D/A converter, with proportioning valve, servo valve phase
This, such valve arrangement is simple, good manufacturability, reproducible, stable and reliable in work, because it will be tight to computer and hydraulic technique
In conjunction with, thus have broad application prospects.
Traditional digital valve control mode typically adopts Incremental control and pulse width modulation controlled method, and Incremental control is main
Produce digital type pulse signal drive stepping motor by control system to rotate, then by mechanical switching device, motor is revolved
Transhipment is dynamic to be converted to linear motion, thus carrying movable valve plug to move, controlling and adjusting hydraulic parameter.But because motor has relatively
Large rotating inertia, after being mechanically connected with hydraulic valve, inertia increases, and natural frequency reduces further, and therefore frequency response performance is subject to
Considerable restraint, or even high frequency step-out phenomenon occurs.
Pulse-width modulation digital valve is generally high-speed switch type digital valve, and the pulsewidth mainly adjusting input signal carrys out control valve
Push And Release and open and time span, thus reach control liquor stream direction, flow and pressure purpose.But it controls essence
Degree is low, and control model is single and structure is complex, uses generally as single digital valve, seldom does pilot valve and uses.
Content of the invention
The technical problem to be solved is to provide a kind of fast response time, and control accuracy is high and control model can be only
Vertical configuration, the reversal valve of flexible combination.
The present invention solves above-mentioned technical problem and be employed technical scheme comprise that：
A kind of a new valve of electric hydraulic control exchange direction is it is characterised in that described electro-hydraulic reversing valve includes left pilot valve；Right pilot valve；Left main valve；
Right main valve；Left pilot valve driving means；Right pilot valve driving means；Wherein, the oil-feed of described left pilot valve oil inlet P 1
The oil inlet passage of passage and described right pilot valve oil inlet P 2 portion and pilot valve oil inlet passage P' vertical connection in pilot valve body,
The oil discharge passage of the oil discharge passage of described left pilot valve oil-out T1 and described right pilot valve oil-out T2 portion in pilot valve body
On pilot valve drainback passage T' vertical connection, the asphalt channel of described left pilot valve control port A1 and described left valve core of main valve
End cavity is connected with main valve body inner passage by guide valve blocks, described left pilot valve control port B1 and described left valve core of main valve
Lower end cavity is connected with main valve body external channel by guide valve blocks, the asphalt channel of described right pilot valve control port A2 and institute
State right valve core of main valve upper end cavity to connect with main valve body inner passage by guide valve blocks, described right pilot valve control port B2's
Asphalt channel is connected with main valve body external channel by guide valve blocks with described right valve core of main valve lower end cavity, and described left main valve enters
The asphalt channel of the asphalt channel of hydraulic fluid port P3 and described right main valve oil inlet P 4 is in the internal oil circuit with main valve oil inlet P of main valve body
The asphalt channel of passage vertical connection, the asphalt channel of described left main valve oil return inlet T 3 and described right main valve oil return inlet T 4 is in main valve
Internal portion and the asphalt channel vertical connection of main valve oil return inlet T；
Preferred version, wherein, the valve element of described left pilot valve is distributed in pilot valve with the valve element horizontal symmetry of described right pilot valve
Same valve body hole in；
Preferred version, wherein, described left pilot valve driving means are left voice coil motor, and described right pilot valve driving means are
Right voice coil motor；
Preferred version, wherein, the valve element attachment means of described left voice coil motor and described left pilot valve, described right voice coil motor with
The valve element attachment means of described right pilot valve are shaft coupling；
Preferred version, wherein, also includes central control unit, described central control unit is arranged on the valve body of described left pilot valve
Upper-center；
Preferred version, wherein, described central control unit is all total by CAN with described left voice coil motor, described right voice coil motor
Line connects；
Preferred version, wherein, the valve element of described left main valve, the valve element of described right main valve vertically symmetrical are arranged in described left main valve
In valve body, the valve body of described right main valve；
Preferred version, wherein, the valve body of described left main valve is same valve body with the valve body of described right main valve；
Preferred version, wherein, also includes left dislocation sensor, right displacement transducer, described left dislocation sensor upper end is arranged on
In pilot valve body, lower end is inserted in the circular hole of valve element upper end of described left main valve, forms gap cooperation, described left dislocation sensing
Device wire is connected with described central control unit by pilot valve body；Described right displacement transducer upper end is arranged on pilot valve valve
In vivo, lower end is inserted in the circular hole of valve element upper end of described right main valve, forms gap cooperation, and described right displacement transducer wire leads to
Cross pilot valve body to be connected with described central control unit；
Preferred version, wherein it is characterised in that described left dislocation sensor, described right displacement transducer are LVDT displacement biography
Sensor.
The method have the characteristics that：, by voice coil motor independent control, fast response time, control accuracy is high for pilot valve core；
Main valve plug, respectively by pilot valve independent control, due to being provided with displacement transducer, can carry out precise control to primary spool position,
And it is possible to the operating mode using according to actual platform, determine optimal double spool combination control program.
Brief description
Fig. 1 is a kind of electrohydraulic change valve structure schematic diagram of the present invention；
Fig. 2 is a kind of Application Example of electro-hydraulic reversing valve of the present invention；
Fig. 3 is a kind of Another Application embodiment of electro-hydraulic reversing valve of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described further.
As shown in figure 1, a kind of a new valve of electric hydraulic control exchange direction, described electro-hydraulic reversing valve includes left pilot valve 1；Right pilot valve 2；Left
Main valve 3；Right main valve 4；Left pilot valve driving means 5；Right pilot valve driving means 6；Wherein, described left pilot valve 1 oil-feed
The oil inlet passage of mouth P1 and the oil inlet passage of described right pilot valve 2 oil inlet P 2 portion and pilot valve oil inlet passage in pilot valve body
P' vertical connection, the oil discharge passage of described left pilot valve 1 oil-out T1 is existed with the oil discharge passage of described right pilot valve 2 oil-out T2
Guide valve blocks inside and pilot valve drainback passage T' vertical connection, the asphalt channel of described left pilot valve 1 control port A1 and institute
State left main valve 3 valve element upper end cavity to connect with main valve body inner passage by guide valve blocks, described left pilot valve 1 control port B1
Connected with main valve body external channel by guide valve blocks with described left main valve 3 valve element lower end cavity, described right pilot valve 2 controls oil
The asphalt channel of mouth A2 is connected with main valve body inner passage by guide valve blocks with described right main valve valve 4 core upper end cavity, described
It is external with main valve that the asphalt channel of right pilot valve 2 control port B2 and described right main valve 4 valve element lower end cavity pass through guide valve blocks
The asphalt channel of portion's channel connection, the asphalt channel of described left main valve 3 oil inlet P 3 and described right main valve 4 oil inlet P 4 is in main valve
Internal portion and the asphalt channel vertical connection of main valve oil inlet P, the asphalt channel of described left main valve 3 oil return inlet T 3 and described right master
The asphalt channel of valve 4 oil return inlet T 4 is in the internal asphalt channel vertical connection with main valve oil return inlet T of main valve body；
Specifically, the valve element of described left pilot valve 1 and the valve element horizontal symmetry of described right pilot valve 2 are distributed in the same of pilot valve
In valve body hole；
Specifically, described left pilot valve driving means 5 are left voice coil motor, and described right pilot valve driving means 6 are right sound
Circle motor；
In addition, the valve element attachment means of described left voice coil motor and described left pilot valve 1, described right voice coil motor and described right elder generation
The valve element attachment means of pilot valve 2 are shaft coupling；
Specifically, also include central control unit 9, described central control unit 9 is arranged on the valve body upper end of described left pilot valve
Central authorities；
Specifically, described central control unit 9 is all connected by CAN with described left voice coil motor, described right voice coil motor；
Specifically, the valve element of described left main valve 3, the vertically symmetrical valve body being arranged in described left main valve of valve element of described right main valve 4,
In the valve body of described right main valve；
Specifically, the valve body of described left main valve 3 and the valve body of described right main valve 4 are same valve body；
In addition, also including left dislocation sensor 7, right displacement transducer 8, described left dislocation sensor 7 upper end is arranged on pilot valve
In valve body, lower end is inserted in the circular hole of valve element upper end of described left main valve 3, forms gap cooperation, and described left dislocation sensor 7 is led
Line is connected with described central control unit 9 by pilot valve body；Described right displacement transducer 8 upper end is arranged on pilot valve body
Interior, lower end is inserted in the circular hole of valve element upper end of described right main valve 4, forms gap cooperation, and described right displacement transducer 8 wire leads to
Cross pilot valve body to be connected with described central control unit 9；
In addition, described left dislocation sensor 7, described right displacement transducer 8 are LVDT displacement transducer.
Operation principle with regard to the present invention is simply introduced below：
First, for example, central control unit 9 pass through CAN to the left voice coil motor 5 send "+" signal（+ represent forward current ,-
Represent reverse current）, left voice coil motor 5 drives the valve element of left pilot valve 1 to move right, and oil inlet P 1 and control port A1 connect
Logical, control port B1 connects with oil return inlet T 1 simultaneously, and pilot valve controls fluid to enter P1 mouth from P' mouth, subsequently into A1 mouth, leads to
Cross A1 mouth and enter left main valve 3 valve element upper end cavity, promote left main valve 3 valve element to move downward, left main valve 3 oil inlet P 3 and B mouth connect
Logical, working connection passes through P mouth, P3 mouth enters B mouth, then flows out from B mouth；
2nd, for example, by CAN, voice coil motor 5 sends "-" signal to central control unit 9 to the left, and left voice coil motor 5 drives
The valve element of left pilot valve 1 is connected to left movement, oil inlet P 1 with control port B1, and control port A1 and oil return inlet T 1 connect simultaneously
Logical, pilot valve controls fluid to enter P1 mouth from P' mouth, subsequently into B1 mouth, enters left main valve 3 valve element lower end cavity by B1 mouth,
Left main valve 3 valve element is promoted to move upwards, left main valve 3 hydraulic fluid port B connects with T3 hydraulic fluid port, fluid enters T3 mouth by B mouth, then from T
Mouth flows back to fuel tank；
Three, right pilot valve 2 is identical to the control principle of left main valve 3 with left pilot valve 1 to the control principle of right main valve 4.
Four, for example, precise control is carried out to main valve plug displacement, its control process is：Central control unit 9 voice coil loudspeaker voice coil electricity to the left
Machine 5 sends control signal, and left voice coil motor 5 drives a certain distance of left pilot valve 2 spool displacement, and left pilot valve 2 valve port is opened（Open
Open size relevant with left voice coil motor input current size）, pilot valve controls fluid from P' mouth entrance P1 mouth, subsequently into A1
Mouthful, left main valve 3 valve element upper end cavity is entered by A1 mouth, promotes left main valve 3 valve element to move downward, left dislocation sensor 7 is by position
Shifting signal is converted to corresponding electric signal, passes to central control unit 9 by CAN, is compared with given control signal, than
Compared with error amount after scaling adjustment, it is transferred to left voice coil motor 5 again by CAN, thus realizing to left main valve 3
The accurate closed loop control of valve element.
In addition, it is necessary to explanation, the displacement of pilot valve is directly proportional to the size of voice coil motor input current, inputs electricity
Stream is big, then pilot valve displacement is big, and the opening of valve is just big, and just big by the flow of valve port, vice versa.
Fig. 2 is a kind of Application Example of electro-hydraulic reversing valve of the present invention, in the present embodiment, control requirement be,
Hydraulic cylinder rod chamber：It is configured to flow control mode, realize the precise control in a certain movement velocity for the hydraulic cylinder, hydraulic cylinder no bar
Chamber：It is configured to pressure control mode, realize minimum back pressure, efficient energy-saving.
Its control process is：Voice coil motor 5 sends the control electric current of corresponding movement velocity to central control unit 9 to the left, left
Voice coil motor 5 drives a certain distance of valve element displacement to the right of left pilot valve 1, and the valve port of left pilot valve 1 is opened（Openings of sizes and electricity
Stream size is proportional）, the fluid of certain pressure and flow passes through P', P1 mouth and enters A1 mouth, then flows into the valve of left main valve 3
Core upper end, destroys the stress balance of left main valve 3 valve element, promotes left main valve 3 valve element to a certain distance of bottom offset, the valve of left main valve 3
Mouth is opened（Openings of sizes and the proportional relation of oil liquid pressure flowing into epicoele）, now, the working connection fluid of a certain flow passes through P
Mouth, P3 mouth, B mouth enter hydraulic cylinder rod chamber, because flow and hydraulic cylinder rod chamber net sectional area are definite value, hydraulic cylinder
Movement velocity is definite value, thus realizing the precise control to hydraulic cylinder piston movement velocity；Central control unit 9 sound to the right simultaneously
Circle motor 6 sends control electric current, and right voice coil motor 6 drives the valve element of right pilot valve 2 to move right, and moving displacement amount is by inputting electricity
Stream size controls, and oil inlet P 2 is connected with control port B2, and oil return inlet T 2 is connected with control port A2, and oil circuit control fluid is from P'
Mouth, P2 mouth, B2 mouth enter right main valve 2 valve element lower end cavity, promote right main valve 4 valve element to move upwards, right main valve 4 valve port is beaten completely
Open, hydraulic cylinder rodless cavity fluid enters T4 mouth by A mouth, then flows back to fuel tank by T mouth, due to being directly connected to fuel tank, institute
To realize minimum back pressure control.
Fig. 3 is a kind of Another Application embodiment of electro-hydraulic reversing valve of the present invention, and in the present embodiment, controlling will
Ask：Two hydraulic cylinders realize different movement velocitys.
Its control process is：Central control unit 9 passes through CAN, and voice coil motor 5 and right voice coil motor 6 export not to the left
Same control electric current, left voice coil motor 5 drives the valve element of left pilot valve 1 to move right respective distances, controls fluid from P', P1
Mouth, A1 mouth enter the valve element upper end cavity of left main valve 3, promote left main valve 3 valve element to move down a certain distance, the master of a certain flow
Fluid enters left hydraulic cylinder rodless cavity from P mouth, P3 mouth, B mouth, promotes left hydraulic cylinder piston rod to move ahead with a certain speed；Simultaneously right
Voice coil motor 6 drives right pilot valve 2 valve element to the corresponding distance of left movement, controls fluid to enter right main valve from P', P2 mouth, A2 mouth
4 valve element upper end cavitys, promote right main valve 4 valve element to move down respective distance, the main fluid of a certain flow is from P mouth, P4 mouth, A mouth
Entering right hydraulic cylinder rodless cavity, promoting right hydraulic cylinder piston rod to move ahead with another speed, thus realizing two hydraulic cylinders with different
Speed moves ahead.
In addition, it is necessary to explanation, this specification and its accompanying drawing 2, accompanying drawing 3 are the Application Example of the present invention, do not illustrate
The present invention only has this two Application Examples, for example, it is possible to it is different that two and above hydraulic cylinder are implemented with the same time simultaneously
Speed or identical speed controlling of same time, for example, it is possible to it is mutually synchronized to implement different time to three and above hydraulic cylinder
Degree or different time friction speed control, for example, it is possible to implement friction speed to each hydraulic cylinder, different pressures control, example
As can be realized the essence to each hydraulic cylinder piston rod moving displacement by the closed loop control of the precise displacement to valve core of main valve
Really control.
Claims (10)
1. a kind of a new valve of electric hydraulic control exchange direction is it is characterised in that described electro-hydraulic reversing valve includes left pilot valve；Right pilot valve；Left master
Valve；Right main valve；Left pilot valve driving means；Right pilot valve driving means；Wherein, the entering of described left pilot valve oil inlet P 1
In pilot valve body, portion is vertical with pilot valve oil inlet passage P' connects for the oil inlet passage of oily passage and described right pilot valve oil inlet P 2
Logical, the oil discharge passage of the oil discharge passage of described left pilot valve oil-out T1 and described right pilot valve oil-out T2 is in pilot valve body
Portion and pilot valve drainback passage T' vertical connection, the asphalt channel of described left pilot valve control port A1 and described left valve core of main valve
Upper end cavity is connected with main valve body inner passage by guide valve blocks, described left pilot valve control port B1 and described left main valve valve
Core lower end cavity is connected with main valve body external channel by guide valve blocks, the asphalt channel of described right pilot valve control port A2 with
Described right valve core of main valve upper end cavity is connected with main valve body inner passage by guide valve blocks, described right pilot valve control port B2
Asphalt channel connected with main valve body external channel by guide valve blocks with described right valve core of main valve lower end cavity, described left main valve
The asphalt channel of the asphalt channel of oil inlet P 3 and described right main valve oil inlet P 4 is in the internal oil with main valve oil inlet P of main valve body
Paths vertical connection, the asphalt channel of the asphalt channel of described left main valve oil return inlet T 3 and described right main valve oil return inlet T 4 is being led
Valve inner and the asphalt channel vertical connection of main valve oil return inlet T.
2. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 is it is characterised in that the valve element of described left pilot valve and institute
The valve element horizontal symmetry stating right pilot valve is distributed in the same valve body hole of pilot valve.
3. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 is it is characterised in that described left pilot valve driving means
For left voice coil motor, described right pilot valve driving means are right voice coil motor.
4. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 is it is characterised in that described left voice coil motor and a described left side
The valve element attachment means of pilot valve, described right voice coil motor are shaft coupling with the valve element attachment means of described right pilot valve.
5. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 is it is characterised in that also include central control unit, institute
State the valve body upper-center that central control unit is arranged on described left pilot valve.
6. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 it is characterised in that described central control unit with described
Left voice coil motor, described right voice coil motor are all connected by CAN.
7. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 is it is characterised in that the valve element of described left main valve, described
In the vertically symmetrical valve body being arranged in described left main valve of the valve element of right main valve, the valve body of described right main valve.
8. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 it is characterised in that the valve body of described left main valve with described
The valve body of right main valve is same valve body.
9. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 is it is characterised in that also include left dislocation sensor, the right side
Displacement transducer, described left dislocation sensor upper end is arranged in pilot valve body, and lower end is inserted on the valve element of described left main valve
In the circular hole at end, form gap cooperation, described left dislocation sensor conductor passes through pilot valve body and described central control unit
Connect；Described right displacement transducer upper end is arranged in pilot valve body, and the circle of the valve element upper end of described right main valve is inserted in lower end
In the hole, forms gap cooperation, and described right displacement transducer wire is connected with described central control unit by pilot valve body.
10. a kind of a new valve of electric hydraulic control exchange direction according to claim 1 is it is characterised in that described left dislocation sensor, described
Right displacement transducer is LVDT displacement transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610989217.9A CN106438547A (en) | 2016-11-10 | 2016-11-10 | Novel electro-hydraulic directional control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610989217.9A CN106438547A (en) | 2016-11-10 | 2016-11-10 | Novel electro-hydraulic directional control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106438547A true CN106438547A (en) | 2017-02-22 |
Family
ID=58206853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610989217.9A Pending CN106438547A (en) | 2016-11-10 | 2016-11-10 | Novel electro-hydraulic directional control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106438547A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446278A (en) * | 2021-06-28 | 2021-09-28 | 于化杰 | Hydraulic reversing valve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102177481A (en) * | 2008-06-11 | 2011-09-07 | 伊顿公司 | Auto-tuning electro-hydraulic valve |
| CN102575792A (en) * | 2009-08-05 | 2012-07-11 | 伊顿公司 | Proportional poppet valve with integral check valve |
-
2016
- 2016-11-10 CN CN201610989217.9A patent/CN106438547A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102177481A (en) * | 2008-06-11 | 2011-09-07 | 伊顿公司 | Auto-tuning electro-hydraulic valve |
| CN102575792A (en) * | 2009-08-05 | 2012-07-11 | 伊顿公司 | Proportional poppet valve with integral check valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446278A (en) * | 2021-06-28 | 2021-09-28 | 于化杰 | Hydraulic reversing valve |
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Application publication date: 20170222 |