CN207960641U - Electro-hydraulic reversing valve group for hydraulic support - Google Patents
Electro-hydraulic reversing valve group for hydraulic support Download PDFInfo
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- CN207960641U CN207960641U CN201721777684.1U CN201721777684U CN207960641U CN 207960641 U CN207960641 U CN 207960641U CN 201721777684 U CN201721777684 U CN 201721777684U CN 207960641 U CN207960641 U CN 207960641U
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Abstract
A kind of electro-hydraulic reversing valve group for hydraulic support of the utility model, including valve body, multiple commutation main valves are equipped in valve body, each commutation main valve, which is connected respectively, is in series with electromagnetic priority valve, form a fuction output group between one electromagnetic priority valve and a commutation main valve, each fuction output group corresponds to the load in control hydraulic support and realizes an action command, between each fuction output group independently of each other, can realize at the same to load feed flow, and then control load and meanwhile act.Valve body is equipped with total inlet and total liquid return hole, total inlet is divided into two-way respectively to commutation main valve and electromagnetic priority valve feed flow, the control switch that electromagnetic priority valve is opened and closed as control commutation main valve, to control break-make of total inlet to commutation main valve feed flow, and then control function output group, to load feed flow, the liquid that returns of commutate main valve and electromagnetic priority valve converges to total liquid return hole respectively.The utility model is simple in structure, can realize automation control hydraulic support acts.
Description
Technical field
The utility model is related to hydraulic transmission technology fields, more particularly to a kind of electro-hydraulic reversing valve for hydraulic support
Group.
Background technology
At present due to coal mine high-yield and high-efficiency, hydraulic support computer control system is just more and more in major mineral bureau
It uses, and domestic hydraulic support electro-hydraulic reversing valve makes blank, other industry that can not ensure to dislike under coal mine again with solenoid valve
Bad working environment and explosion-proof performance requirement, it is existing it is domestic substantially use manually hydraulic support, needed for manual hydraulic support
Control valve type it is more, it is complicated in disorder, cannot be integrated, volume is big, is not easy to install, and labor intensity is big, automate journey
Spend low, speed is slow.
Utility model content
The technical problem to be solved by the present invention is to provide it is a kind of it is simple in structure, can realize automation control hydraulic pressure branch
The electro-hydraulic reversing valve group for hydraulic support of frame action.
A kind of electro-hydraulic reversing valve group for hydraulic support of the utility model, including valve body, the valve body are interior equipped with multiple
Commutate main valve, and each commutation main valve has been connected respectively electromagnetic priority valve；
The commutation main valve includes main valve, spool, holds stifled, main spool spring and main valve valve pocket, the main valve valve pocket, master
Valve base and end is stifled is sequentially connected from left to right, is equipped with first chamber in the main valve valve pocket, the is equipped in the main valve
Two chambers, are equipped with third chamber in the end is stifled, and the spool is provided in first chamber, second chamber and third chamber, institute
It states main spool spring to be sheathed on the outside of spool and be placed in first chamber, main valve piston is sheathed on the outside of spool and is placed in third
In chamber, the end blocks the first inlet and the first liquid return hole being respectively equipped with third chamber, first feed liquor
Mouth is located at the both ends of the main valve piston with the first liquid return hole, and the main valve valve pocket is negative equipped with what is be connected to first chamber
Liquid outlet is carried, the end of the spool is equipped with the second inlet, and the spool is let out equipped with multiple along what its axle center was uniformly arranged
Discharge orifice, the discharge orifice are connected to the second inlet；
The electromagnetic priority valve includes pilot valve body and transmission component, is worn successively from left to right in the pilot valve body
Equipped with feed liquor valve pocket, middle valve pocket, liquid return valve jacket and upper valve sleeve, it is equipped with the 4th chamber in the feed liquor valve pocket, in the middle valve pocket
Equipped with the 5th chamber, it is equipped with the 6th chamber in the liquid return valve jacket, the 7th chamber, the transmission component are equipped in the upper valve sleeve
It provides in the 4th chamber, the 5th chamber, the 6th chamber and the 7th chamber, being respectively equipped on the pilot valve body and the 4th chamber
Third inlet, the second liquid return hole with the liquid outlet of the 5th chamber and the 6th chamber of room connection；
The valve body is equipped with total inlet and total liquid return hole, and total inlet passes through the first oil inlet passage and the respectively
The connection of two inlets is connected to by the second oil inlet passage with third inlet, and the liquid outlet is connected to the first inlet, described
Total liquid return hole is connected to the first liquid return hole by the first drainback passage, is connected by the second drainback passage and the second liquid return hole respectively
It is logical.
The utility model is used for the electro-hydraulic reversing valve group of hydraulic support, wherein the transmission component includes from left to right successively
Spring, spring base, the first sealed steel ball, thimble, the second sealed steel ball, mandril and the electromagnet of connection, the spring, spring base
It is placed in the 4th chamber with the first sealed steel ball, the thimble is placed in the 5th chamber, and second sealed steel ball is placed in the 6th
In chamber, the mandril is placed through the 6th chamber and extends in the 7th chamber, and the electromagnet is placed in the 7th chamber.
The utility model is used for the electro-hydraulic reversing valve group of hydraulic support, wherein second oil inlet passage is equipped with filtering
Device.
The utility model is used for the electro-hydraulic reversing valve group of hydraulic support, wherein second drainback passage is equipped with back liquid list
To valve.
The utility model is used for the electro-hydraulic reversing valve group of hydraulic support, wherein being additionally provided in parallel with the second drainback passage the
Three drainback passages, the third drainback passage are equipped with back liquid cutout valve, and the valve body is equipped with and is connected to third drainback passage
Pressure relief opening.
The utility model is used for the electro-hydraulic reversing valve group of hydraulic support, wherein using cone between the spool and main valve
Face seals.
The utility model is used for the electro-hydraulic reversing valve group of hydraulic support, wherein further including the control machine being mounted on valve body
Structure, the control mechanism are electrically connected with electromagnetic priority valve.
Compared with prior art, advantages and beneficial effects possessed by the utility model are：
1. the utility model, by being equipped with multiple function output group, each main valve that commutates, which is connected respectively, is in series with electromagnetism
Pilot valve forms a fuction output group between one electromagnetic priority valve and a commutation main valve, and each fuction output group corresponds to
An action command is realized in the load controlled in hydraulic support, between each fuction output group independently of each other, can be realized simultaneously
It to load feed flow, and then controls load while acting, high degree of automation, work efficiency is high.
2. the utility model on third drainback passage by equipped with the third drainback passage in parallel with the second drainback passage, setting
There are back liquid cutout valve, valve body to be equipped with the pressure relief opening being connected to third drainback passage.It returns liquid cutout valve and plays the role of safety valve,
When entire electro-hydraulic reversing valve group returns liquid obstruction or unsmooth time liquid, the first drainback passage and the second drainback passage can be caused
Pressure increases, and the pressure increased at this time overcomes back the spring force of liquid cutout valve, returns the unlatching of liquid cutout valve at this time, makes entirely electro-hydraulic change
Supercharging is not will produce to valve group, to protect the safety of each structure in electro-hydraulic reversing valve group.
3. the utility model effectively reduces valve body inner fluid by the way that oil inlet passage and drainback passage to be all disposed in valve body
The operating pressure of entirety electro-hydraulic reversing valve group is stablized in leakage, reduces energy expenditure.
4. the second oil inlet passage of the utility model is equipped with filter, it acts as filter out to flow into oil in electromagnetic priority valve
Impurity in liquid, due to the liquid stream latus rectum very little of electromagnetic priority valve, when valve port is used firmly to hard leakproofness, entire electromagnetic priority valve
It is very high to oil cleanliness requirement, play the role of protecting electromagnetic priority valve.
5. the second drainback passage of the utility model is equipped with back liquid check valve, it acts as cut-out electromagnetic priority valves and commutation
The second drainback passage between main valve keeps the forward flow of electromagnetic priority valve internal liquid, safeguards liquid in electromagnetic priority valve
Cleaning.
The electro-hydraulic reversing valve group for hydraulic support of the utility model is described further below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is vertical view of the utility model for the electro-hydraulic reversing valve group of hydraulic support；
Fig. 2 is rearview of the utility model for the electro-hydraulic reversing valve group of hydraulic support；
Fig. 3 is front view of the utility model for the electro-hydraulic reversing valve group of hydraulic support；
Fig. 4 is structural schematic diagram of the utility model for the main valve that commutates in the electro-hydraulic reversing valve group of hydraulic support；
Fig. 5 is structural schematic diagram of the utility model for electromagnetic priority valve in the electro-hydraulic reversing valve group of hydraulic support；
Fig. 6 is systematic schematic diagram of the utility model for the electro-hydraulic reversing valve group of hydraulic support；
Wherein：1, valve body；2, filter；3, commutate main valve；4, control mechanism；5, electromagnetic priority valve；6, total inlet；7、
Total liquid return hole；8, liquid check valve is returned；9, liquid cutout valve is returned；
301, main valve valve pocket；302, main spool spring；303, first chamber；304, main valve；305, second chamber；306、
Third chamber；307, end is stifled；308, the first inlet；309, spool；310, main valve piston；311, the first liquid return hole；312, it lets out
Discharge orifice；313, liquid outlet is loaded；314, the second inlet；
501, pilot valve body；502, feed liquor valve pocket；503, middle valve pocket；504, liquid return valve jacket；505, upper valve sleeve；506, electric
Magnet；507, mandril；508, the second sealed steel ball；509, the second liquid return hole；510, thimble；511, liquid outlet；512, third into
Liquid mouth；513, the first sealed steel ball；514, spring base；515, spring.
Specific implementation mode
As shown in Figure 1 and Figure 2, a kind of electro-hydraulic reversing valve group for hydraulic support of the utility model, including valve body 1, valve body
Multiple commutation main valves 3 are equipped in 1, each main valve 3 that commutates, which is connected respectively, is in series with electromagnetic priority valve 5, an electromagnetic pilot
A fuction output group is formed between valve 5 and a commutation main valve 3, each fuction output group corresponds in control hydraulic support
An action command is realized in load, between each fuction output group independently of each other, can be realized simultaneously to load feed flow, and then control
System is loaded while being acted.
As shown in Fig. 3, Fig. 6, valve body 1 be equipped with total inlet 6 and total liquid return hole 7, total inlet 6 divide for two-way respectively to
Commutate main valve 3 and 5 feed flow of electromagnetic priority valve, the control switch that electromagnetic priority valve 5 is opened and closed as control commutation main valve 3,
To control break-make of the total inlet 6 to commutation 3 feed flow of main valve, and then control function output group, to load feed flow, commutate main valve 3
Converge respectively to total liquid return hole 7 with the liquid that returns of electromagnetic priority valve 5.
Further include the control mechanism 4 being mounted on valve body 1, control mechanism 4 is electrically connected with electromagnetic priority valve 5, control mechanism
Open and close for controlling electromagnetic priority valve are powered and are powered off to electromagnetic priority valve.
As shown in figure 4, commutation main valve 3 includes main valve 304, spool 309, holds stifled 307, main spool spring 302 and main valve
Valve pocket 301, main valve valve pocket 301, main valve 304 and end stifled 307 are sequentially connected from left to right, and the is equipped in main valve valve pocket 301
One chamber 303, main valve 304 is interior to be equipped with second chamber 305, is provided equipped with third chamber 306, spool 309 in end stifled 307
In first chamber 303, second chamber 305 in third chamber 306, use the conical surface close between spool 309 and main valve 304
Envelope, main spool spring 302 are sheathed on the outside of spool 309 and are placed in first chamber 303, and main valve piston 310 is sheathed on spool 309
Outside and be placed in third chamber 306, be respectively equipped on end stifled 307 the first inlet 308 being connected to third chamber 306 and
First liquid return hole 311, the first inlet 308 and the first liquid return hole 311 are located at the both ends of main valve piston 310, main valve piston
310 are divided to third chamber 306 for two relatively independent chambers, and the first inlet 308 and the first liquid return hole 311 are in disconnected always
The state opened, main valve valve pocket 301 are equipped with the load liquid outlet 313 being connected to first chamber 303, and the end of spool 309 is equipped with
Second inlet 314, spool 309 be equipped with multiple discharge orifices 312 being uniformly arranged along its axle center, discharge orifice 312 and second into
Liquid mouth 314 is connected to.
As shown in figure 5, electromagnetic priority valve 5 includes pilot valve body 501 and transmission component, from a left side in pilot valve body 501
It is equipped with feed liquor valve pocket 502, middle valve pocket 503, liquid return valve jacket 504 and upper valve sleeve 505 successively to the right side, is equipped in feed liquor valve pocket 502
4th chamber is equipped with the 5th chamber in middle valve pocket 503, and the 6th chamber is equipped in liquid return valve jacket 504, and the is equipped in upper valve sleeve 505
Seven chambers, transmission component provide in the 4th chamber, the 5th chamber, the 6th chamber and the 7th chamber, divide on pilot valve body 501
It She You not be with the third inlet 512 of the 4th chamber and the liquid outlet 511 of the 5th chamber and the 6th chamber
The second liquid return hole 509.
Transmission component includes sequentially connected spring 515, spring base 514, the first sealed steel ball 513, thimble from left to right
510, the second sealed steel ball 508, mandril 507 and electromagnet 506, spring 515, spring base 514 and the first sealed steel ball 513 are placed in
In 4th chamber, thimble 510 is placed in the 5th chamber, and the second sealed steel ball 508 is placed in the 6th chamber, and mandril 507 is placed through
6th chamber simultaneously extends in the 7th chamber, and electromagnet 506 is placed in the 7th chamber.
Total inlet 6 is connected to by the first oil inlet passage with the second inlet 314 respectively, passes through the second oil inlet passage and the
Three inlets 512 are connected to, and liquid outlet 511 is connected to the first inlet 308, total liquid return hole 7 respectively by the first drainback passage and
The connection of first liquid return hole 311 is connected to by the second drainback passage with the second liquid return hole 509.
Further, the second oil inlet passage is equipped with filter 2, and it acts as filter out to flow into oil in electromagnetic priority valve 5
Impurity in liquid, due to the liquid stream latus rectum very little of electromagnetic priority valve 5, when valve port is used firmly to hard leakproofness, entire electromagnetic pilot
Valve 5 is very high to oil cleanliness requirement, plays the role of protecting electromagnetic priority valve 5.
Second drainback passage is equipped with back liquid check valve 8, and it acts as between cut-out electromagnetic priority valve 5 and commutation main valve 3
The second drainback passage, keep 5 internal liquid of electromagnetic priority valve forward flow, safeguard cleaning liquid in electromagnetic priority valve 5.
It is additionally provided with the third drainback passage in parallel with the second drainback passage, third drainback passage is equipped with back liquid cutout valve 9,
Valve body 1 is equipped with the pressure relief opening being connected to third drainback passage.It returns liquid cutout valve 9 and plays the role of safety valve, when entire electro-hydraulic
When the valve group that commutates returns liquid obstruction or unsmooth time liquid, the first drainback passage can be caused to increase with the second drainback passage pressure,
The pressure increased at this time overcomes back 515 power of spring of liquid cutout valve 9, returns the unlatching of liquid cutout valve 9 at this time, makes entire electro-hydraulic reversing valve
Group not will produce supercharging, to protect the safety of each structure in electro-hydraulic reversing valve group.
Wherein, the first oil inlet passage, the second oil inlet passage, the first drainback passage, the second drainback passage and third oil return are logical
Road is all disposed in valve body 1, is effectively reduced the leakage of 1 inner fluid of valve body, is stablized the operating pressure of entirety electro-hydraulic reversing valve group, reduces
Energy expenditure.
The course of work of electro-hydraulic reversing valve group is described in detail in conjunction with the concrete structure of electromagnetic priority valve 5 and commutation main valve 3.
1. the opening process of electro-hydraulic reversing valve group is：When electromagnetic priority valve 5 is powered under the action of control mechanism 4, electricity
Magnet 506 applies a thrust to the left by electromagnetic force to mandril 507, which passes to second successively by mandril 507
Sealed steel ball 508, the first sealed steel ball 513, on spring base 514, makes spring base 514 overcome the anti-work of spring 515 at thimble 510
It firmly drives the first sealed steel ball 513, thimble 510 and the second sealed steel ball 508 to move downward, makes the 4th chamber and the 5th chamber
Connection, the 5th chamber and the 6th chamber partition, and then third inlet 512 is made to be connected to liquid outlet 511, liquid outlet 511 and the
Two liquid return holes 509 disconnect, at this point, total inlet 6 is connected to by the second oil inlet passage with third inlet 512, fluid passes through the
Three inlets 512 flow to liquid outlet 511；
Liquid outlet 511 is connected to the first inlet 308, and fluid enters third chamber 306 by the first inlet 308
In right side, the pressure in 306 right side of third chamber rises, and applies a hydraulic pressure to the left to main valve piston 310 and spool 309
Power, since the left side of third chamber 306 is connected to the first liquid return hole 311, and the left end of spool 309 has load back pressure (negative
It refers to that fluid enters from the second inlet 314 to carry back pressure, flows to the first liquid return hole 311, and generation makes the power of spool 309 to the right, this
When whole performance loop in pressure be that zero), therefore the pressure on right side is more than the pressure in left side in third chamber 306, and then makes
Spool 309 overcomes main valve piston 310 and the reaction force of main spool spring 302 to move downward, and makes second chamber 305 and third chamber
306 partitions, first chamber 303 are connected to second chamber 305, and 309 inner cavity chamber of spool is connected to first chamber 303, i.e., first time
Liquid mouth 311 is disconnected with load liquid outlet 313, and the second inlet 314 is connected to load liquid outlet 313, meanwhile, total inlet 6 is logical
It crosses the first oil inlet passage and enters the second inlet 314, then flowed into first chamber 303 from discharge orifice 312, it is then oily
Liquid realizes the feed flow to load from the load outflow of liquid outlet 313, and then controls load and realize corresponding actions.
2. the closing process of electro-hydraulic reversing valve group is：When electromagnetic priority valve 5 powers off under the action of control mechanism 4, electricity
The magnetic force of magnet 506 disappears, it is made to disappear to the thrust that mandril 507 applies, spring base 514 under the promotion of spring 515 successively
So that the first sealed steel ball 513, thimble 510, the second sealed steel ball 508 and mandril 507 is revert to original position, makes the 4th chamber and the 5th
Chamber separates, the 5th chamber and the 6th chamber, and then liquid outlet 511 is made to be connected to the second liquid return hole 509, third inlet
512 disconnect with liquid outlet 511, at this point, fluid no longer flow to liquid outlet 511, the fluid of liquid outlet 511 under the action of hydraulic pressure to
Second liquid return hole 509 conveys；
Liquid outlet 511 is connected to the first inlet 308, and the fluid being full of in third chamber 306 passes sequentially through the first feed liquor
Mouth 308, liquid outlet 511 are back to second time liquid delivery port, and the pressure in 306 left side of third chamber declines, and spool 309 is in main valve
Under the effect of 302 counter-force of spring, main valve piston 310 is made to be moved right with spool 309, until making 309 inner cavity chamber of spool and third chamber
The right side of room 306 is connected to, i.e. the second inlet 314 is disconnected with load liquid outlet 313, the second inlet 314 and the first liquid return hole
311 connections then realize that the liquid that returns of fluid, load liquid outlet 313 no longer carry out feed flow, and then control load stopping action.
Embodiment described above is only that preferred embodiments of the present invention are described, not to this practicality
Novel range is defined, and under the premise of not departing from the spirit of the design of the utility model, those of ordinary skill in the art are to this
The various modifications and improvement that the technical solution of utility model is made should all fall into the protection of the utility model claims book determination
In range.
Claims (7)
1. a kind of electro-hydraulic reversing valve group for hydraulic support, it is characterised in that：Including valve body, multiple change is equipped in the valve body
To main valve, each commutation main valve has been connected respectively electromagnetic priority valve；
The commutation main valve includes main valve, spool, holds stifled, main spool spring and main valve valve pocket, the main valve valve pocket, main valve valve
Seat and end are blocked up to be sequentially connected from left to right, and first chamber is equipped in the main valve valve pocket, the second chamber is equipped in the main valve
Room, is equipped with third chamber in the end is stifled, and the spool is provided in first chamber, second chamber and third chamber, the master
Valve spring is sheathed on the outside of spool and is placed in first chamber, and main valve piston is sheathed on the outside of spool and is placed in third chamber
Interior, the end blocks the first inlet and the first liquid return hole being respectively equipped with third chamber, first inlet with
First liquid return hole is located at the both ends of the main valve piston, and the main valve valve pocket is equipped with the load being connected to first chamber and goes out
The end of liquid mouth, the spool is equipped with the second inlet, and the spool is equipped with multiple discharge orifices being uniformly arranged along its axle center,
The discharge orifice is connected to the second inlet；
The electromagnetic priority valve includes pilot valve body and transmission component, is equipped with successively from left to right in the pilot valve body
Feed liquor valve pocket, middle valve pocket, liquid return valve jacket and upper valve sleeve, the feed liquor valve pocket is interior to be equipped with the 4th chamber, is equipped in the middle valve pocket
5th chamber, the liquid return valve jacket is interior to be equipped with the 6th chamber, is equipped with the 7th chamber in the upper valve sleeve, the transmission component provides
Connect with the 4th chamber in the 4th chamber, the 5th chamber, the 6th chamber and the 7th chamber, being respectively equipped on the pilot valve body
Liquid outlet, the second liquid return hole with the 6th chamber of logical third inlet and the 5th chamber；
The valve body be equipped with total inlet and total liquid return hole, total inlet respectively by the first oil inlet passage and second into
The connection of liquid mouth is connected to by the second oil inlet passage with third inlet, and the liquid outlet is connected to the first inlet, described total time
Liquid mouth is connected to the first liquid return hole by the first drainback passage, is connected to the second liquid return hole by the second drainback passage, institute respectively
The first oil inlet passage, the second oil inlet passage, the first drainback passage, the second drainback passage is stated to be placed in valve body.
2. the electro-hydraulic reversing valve group according to claim 1 for hydraulic support, it is characterised in that：The transmission component packet
Sequentially connected spring, spring base, the first sealed steel ball, thimble, the second sealed steel ball, mandril and electromagnet from left to right are included,
The spring, spring base and the first sealed steel ball are placed in the 4th chamber, and the thimble is placed in the 5th chamber, and described second is close
Envelope steel ball is placed in the 6th chamber, and the mandril is placed through the 6th chamber and extends in the 7th chamber, and the electromagnet is placed in
In 7th chamber.
3. the electro-hydraulic reversing valve group according to claim 1 for hydraulic support, it is characterised in that：Second oil inlet is logical
Road is equipped with filter.
4. the electro-hydraulic reversing valve group according to claim 1 for hydraulic support, it is characterised in that：Second oil return is logical
Road is equipped with back liquid check valve.
5. the electro-hydraulic reversing valve group according to claim 4 for hydraulic support, it is characterised in that：It is additionally provided with and second time
The third drainback passage of oily channel parallel connection, the third drainback passage are equipped with back liquid cutout valve, and the valve body is equipped with and the
The pressure relief opening of three drainback passages connection.
6. the electro-hydraulic reversing valve group according to claim 1 for hydraulic support, it is characterised in that：The spool and main valve
Conical surface seal is used between valve seat.
7. the electro-hydraulic reversing valve group according to claim 1 for hydraulic support, it is characterised in that：Further include being mounted on valve
Control mechanism on body, the control mechanism are electrically connected with control electromagnetic priority valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721777684.1U CN207960641U (en) | 2017-12-18 | 2017-12-18 | Electro-hydraulic reversing valve group for hydraulic support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721777684.1U CN207960641U (en) | 2017-12-18 | 2017-12-18 | Electro-hydraulic reversing valve group for hydraulic support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207960641U true CN207960641U (en) | 2018-10-12 |
Family
ID=63729255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721777684.1U Active CN207960641U (en) | 2017-12-18 | 2017-12-18 | Electro-hydraulic reversing valve group for hydraulic support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207960641U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586108A (en) * | 2021-07-19 | 2021-11-02 | 北京天地玛珂电液控制系统有限公司 | Electro-hydraulic control proportional reversing valve |
-
2017
- 2017-12-18 CN CN201721777684.1U patent/CN207960641U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586108A (en) * | 2021-07-19 | 2021-11-02 | 北京天地玛珂电液控制系统有限公司 | Electro-hydraulic control proportional reversing valve |
| CN113586108B (en) * | 2021-07-19 | 2024-03-01 | 北京天玛智控科技股份有限公司 | Electro-hydraulic control proportional reversing valve |
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