CN104495709B - Load pressure feedback proportional multi-way valve on electri forklift - Google Patents
Load pressure feedback proportional multi-way valve on electri forklift Download PDFInfo
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- CN104495709B CN104495709B CN201510026413.1A CN201510026413A CN104495709B CN 104495709 B CN104495709 B CN 104495709B CN 201510026413 A CN201510026413 A CN 201510026413A CN 104495709 B CN104495709 B CN 104495709B
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- load pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
-
- 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
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a kind of load pressure feedback proportional multi-way valve on electri forklift, including valve body (3), main valve plug (4) and guide's executive item, valve body (3) is provided with the oil-in (16) and oil return opening (6) connected with valve pocket (17)；It also includes thrust balancing device and load pressure feedback device, described thrust balancing device is connected to the two ends of main valve plug (4), and load pressure feedback device is arranged close to connect valve body (3) side of loading cylinders connector (5)；Described guide's executive item is two proportion pilot valve modules (15), and two proportion pilot valve modules (15) communicate with the valve pocket at the thrust balancing device at main valve plug (4) two ends respectively.After using above structure, when the goods on pallet fork is the heaviest, decrease speed will be slack-off, and when the goods on pallet fork is the lightest, decrease speed will accelerate, and need not artificially regulate, be greatly improved automatization, be greatly improved production efficiency.
Description
Technical field
The present invention relates to the technical field of valve, be especially the control thing on a kind of load-and-unload transport with elevating mechanism
The load pressure feedback proportional multi-way valve on electri forklift of speed that body declines due to deadweight or rotates.
Background technology
Electri forklift, refers to that electricity consumption is to carry out the fork truck of operation.Electri forklift due to its operation control easy, flexibly, make an uproar
Sound is little, pollution is few, and the manipulation strength of operator is light, and its electric power steering, acceleration-controlled system, hydraulic pressure control
System processed and brake system are all controlled by the signal of telecommunication, greatly reduce the labor intensity of operator, the most right
There is the biggest help in the accuracy improving its work efficiency and work, therefore, be applied to harbour, storage and cigarette
The industries such as grass, food, light textile.And the pallet fork of electri forklift has rate request when declining, the pallet fork when zero load
Decrease speed can not be the slowest, such as less than 300 mm/second, and when heavier loads, the decrease speed of pallet fork can not be too fast,
Such as can not be more than 600 mm/second, therefore, the pallet fork of electri forklift needs when declining to be come by hydraulic pressure lowering means
Control, and proportional multi-way valve is as controlling the core liquid casting die that object up-down, inclination etc. are moved, and declines the pallet fork of fork truck
Speed controlling serves the effect of decision.In prior art, the control to electri forklift pallet fork decrease speed has various structures.
As disclosed on State Intellectual Property Office website " the hydraulic pressure lowering means of electri forklift " of Publication No. CN102838056A
Patent, it includes guiding valve and the servomotor connected with oil cylinder, and guiding valve is by the output shaft of drive mechanism and servomotor even
Connecing, this drive mechanism includes the first gear, the second gear, rotates silk braid, sliding screw and case, the first gear and the
Two gears engagements, case fixes with servomotor, and the first gear is connected with the output shaft of servomotor, the second gear and turn
One end of movable wire set connects, and one end of the other end and sliding screw that rotate silk braid screws, the other end of sliding screw and cunning
The spool of valve connects.Disclosed in and for example on State Intellectual Property Office website, Publication No. CN103671335A " loads quick
Electrification proportional multi-way valve " patent, it arranges two-way pilot operated directional control valve, two-way electromagnetic valve, logic side on banked direction control valves oil circuit
To the electronic overflow valve of valve and proportional-type so that it is the two pump interflow work when performing to hoist action, list pump work during other actions,
Another pump off-load.
But, these structures above-mentioned with the following drawback that: either realize pallet fork by servomotor and gear mechanism
The structure that decrease speed controls, or control the single of pump or two works by arranging multiple valve on banked direction control valves oil circuit
The structure made, all there is the problem that structure is complicated, cost is high in them, and structure more complex fault rate is the highest.Such as first
In individual technical scheme, relating to servomotor, gear-driven assembly, on the one hand part is numerous, on the other hand servomotor
Cost is the highest, causes manufacturing cost to increase accordingly；In the most such as second technical scheme, add in banked direction control valves oil circuit
Many valves, have two-way pilot operated directional control valve, two-way electromagnetic valve, logical direction valve and the electronic overflow valve of proportional-type etc., these valves
Addition on the one hand also make cost increase, another aspect makes oil circuit become more complicated, and the assembly of valve is the most complicated, body
Long-pending huger.
It addition, also there is the structure adding throttle orifice inside main valve plug, but, there is problem below in this structure:
1) it is a longilineal part due to main valve plug itself, the processing of throttle orifice will be carried out inside main valve plug, this
Difficulty of processing is very big, and the requirement of process equipment is the highest；
2) same, because main valve plug is a longilineal part, when its work, it is easily deformed, and a deformation will
Producing the phenomenon of card valve, its internal throttle orifice just lost efficacy, the most out of hand to decrease speed, accordingly, there exist greatly
Potential safety hazard；
3) once breaking down, the proportional multi-way valve of this structure cannot be carried out maintenance at all and adjusts, and can only change complete
Set parts, therefore, are greatly increased use cost.
Summary of the invention
The technical problem to be solved is to provide a kind of simple in construction, low cost, is easy to maintenance, can be according to load
Thing weight realizes controlling to adjust the load pressure feedback proportional multi-way valve on electri forklift of pallet fork decrease speed.
For solving above-mentioned technical problem, the load pressure feedback proportional multi-way valve on electri forklift that the present invention provides,
Including valve body, main valve plug and guide's executive item, described main valve plug is slidably fitted in the valve pocket of valve body, guide's executive item
Being arranged in valve body, valve body is provided with the oil-in and oil return opening connected with valve pocket；It also includes thrust balancing device and load
Press feedback device, described thrust balancing device is connected to the two ends of main valve plug, and load pressure feedback device is arranged close to
The valve body side of connection loading cylinders connector；Described guide's executive item is two proportion pilot valve modules, and two
Proportion pilot valve module communicates with the valve pocket at the thrust balancing device at main valve plug two ends respectively.
Described thrust balancing device includes the first valve block, the second valve block, spring and spring pad, the first valve block be connected to away from
The valve body side of loading cylinders connector and inside have the first containing cavity, and the second valve block is connected close to loading cylinders and connects
Valve body side and the inside of mouth have the second containing cavity, and the two ends of main valve plug are respectively protruding into the first containing cavity and the second containing cavity
In；The two ends of main valve plug are equipped with spring and spring pad, and spring pad is socketed on main valve plug, one end of spring and spring pad
Push against, push against at the bottom of the hole of the other end and the first containing cavity or at the bottom of the hole of the second containing cavity；Load pressure feedback device connects
Push against or disengage on the second valve block and with the end of main valve plug；Two respective oil circuit controls of proportion pilot valve module divide
Do not connect with the first containing cavity and the second containing cavity.
Described load pressure feedback device includes small valve core, little spring and plug screw, same at the second containing cavity of the second valve block
There is on one axis the 3rd containing cavity connected with the second containing cavity, one end of small valve core be slidably connected at the second containing cavity and
The connectivity part of the 3rd containing cavity, the other end is socketed with one end of little spring, and the other end of little spring is socketed on plug screw, spiral shell
Plug is threaded on the second valve block；Load pressure feedback oil circuit, described load pressure feedback oil it is additionally provided with in second valve block
The one end on road connects with the 3rd containing cavity, and the other end connects with the loading cylinders connector in valve body.
This proportional multi-way valve also includes that check valve and control valve, described control valve are arranged on the valve body of the first valve block side
In, check valve is arranged in the valve body of loading cylinders oil-out side, and, spool one end of check valve and loading cylinders
Valve body at oil-out forms valve, and the other end is connected with control valve by oil circuit.
After using above structure, the present invention compared with prior art, has the advantage that
1) due to main valve plug respectively by spring and pilot valve pressure and the common effect of load feedback small valve core thrust, come
Regulate and make the thrust at main valve plug two ends reach balance, so that it is determined that the size of hydraulic fluid port aperture on main valve plug, regulating electricity
The speed that electrical forklift upper fork declines；Therefore, when the goods on pallet fork is the heaviest, on main valve plug, the aperture of oil return opening is the least,
Decrease speed will be slack-off, otherwise, when the goods on pallet fork is the lightest, on main valve plug, the aperture of oil return opening is the biggest, declines
Speed will accelerate；And these regulations are all to be automatically adjusted by this proportional multi-way valve to realize, need not artificially regulate, greatly
Improve greatly automatization, the most under the premise that security is guaranteed, be greatly improved production efficiency；
2) due to the processing without carrying out throttle orifice inside main valve plug, without extra drive disk assembly, and simply exist
Valve body inside and outside carries out oil circuit communication, therefore, becomes simply, avoids the occurrence of the phenomenon of card valve making structure, control more
Simultaneously flexibly, production cost is substantially reduced；
3) owing to simply increasing valve block outside valve body, and small valve core is connected in valve block, therefore, even if event occurs in valve
Barrier, is also highly convenient for maintenance and checks.
Accompanying drawing explanation
Fig. 1 is the structural representation of present invention load pressure feedback proportional multi-way valve on electri forklift.
Wherein, the 1, first valve block；2, control valve；3, valve body；4, main valve plug；5, loading cylinders connector；6、
Oil return opening；7, check valve；8, load pressure feedback oil circuit；9, the second valve block；10, plug screw；11, little spring；
12, the 3rd containing cavity；13, small valve core；14, the second containing cavity；15, proportion pilot valve module；16, oil-in；
17, valve pocket；18, spring pad；19, spring；20, the first containing cavity；21, electric magnet.
Detailed description of the invention
With detailed description of the invention, the present invention is described in more detail below in conjunction with the accompanying drawings.
The structural representation of the load pressure feedback proportional multi-way valve on electri forklift of the present invention as shown in Figure 1 can
Knowing, it includes that valve body 3, main valve plug 4 and guide's executive item, described main valve plug 4 are slidably fitted in the valve pocket of valve body 3
In 17, guide's executive item is arranged in valve body 3, and valve body 3 is provided with the oil-in 16 and oil return opening connected with valve pocket 17
6.It also includes thrust balancing device and load pressure feedback device, and described thrust balancing device is connected to the two of main valve plug 4
End, load pressure feedback device is arranged close to connect valve body 3 side of loading cylinders connector 5.Described guide holds
Row part is two proportion pilot valve modules 15, and two proportion pilot valve modules 15 respectively with the power at main valve plug 4 two ends
Valve pocket at bascule communicates.
Described thrust balancing device includes first valve block the 1, second valve block 9, spring 19 and spring pad 18, the first valve block 1
Being connected to valve body 3 side away from loading cylinders connector 5 and inside and have the first containing cavity 20, the second valve block 9 connects
Having the second containing cavity 14 near valve body 3 side of loading cylinders connector 5 and inside, the two ends of main valve plug 4 are respectively
Stretch in the first containing cavity 20 and the second containing cavity 14.The two ends of main valve plug 4 are equipped with spring 19 and spring pad 18,
Spring pad 18 is socketed on main valve plug 4, and one end of spring 19 pushes against with spring pad 18, the other end and the first containing cavity
Push against at the bottom of the hole of 20 or at the bottom of the hole of the second containing cavity 14.Load pressure feedback device be connected on the second valve block 9 and with
The end of main valve plug 4 pushes against or disengages.Two respective oil circuit controls of proportion pilot valve module 15 hold with first respectively
Put chamber 20 to connect with the second containing cavity 14.
Described load pressure feedback device includes small valve core 13, little spring 11 and plug screw 10, and the second valve block 9 is second
There is on the same axis of containing cavity 14 the 3rd containing cavity 12 connected with the second containing cavity 14, one end of small valve core 13
Being slidably connected at the second containing cavity 14 and connectivity part of the 3rd containing cavity 12, the other end is socketed with one end of little spring 11,
The other end of little spring 11 is socketed on plug screw 10, and plug screw 10 is threaded on the second valve block 9.Second valve block 9
Inside being additionally provided with load pressure feedback oil circuit 8, one end of described load pressure feedback oil circuit 8 connects with the 3rd containing cavity 12,
The other end connects with the loading cylinders connector 5 in valve body 3.
This proportional multi-way valve also includes that check valve 7 and control valve 2, described control valve 2 are arranged on the first valve block 1 side
Valve body 3 in, check valve 7 is arranged in the valve body 3 of loading cylinders oil-out 5 side, and, the valve of check valve 7
Valve body 3 at core one end and loading cylinders oil-out 5 forms valve, and the other end is connected with control valve 2 by oil circuit.
The operation principle of proportional multi-way valve of the present invention is as follows:
When the pallet fork of electri forklift needs upwards to lift, near the control of the proportion pilot valve module 15 of the second valve block 9
Fluid enters in the second containing cavity 14, promotes main valve plug 4 mobile (based on the direction shown in accompanying drawing 1) to the left,
Fluid enters valve pocket 18 from the oil-in 16 of valve body 3 through main valve plug 4, then the oil circuit in valve body 3 enters loading cylinders
At connector 5 and push the valve of check valve 7 open, hence into loading cylinders, pallet fork is promoted upwards to lift.Main valve plug 4
Under the thrust that guide's oil pressure of the second containing cavity 14 produces, the spring force with the first containing cavity 20 inner spring balances,
Stopping the movement of main valve plug 4, the valve valve port opening that main valve plug 4 and valve body 3 are formed keeps certain.
When the pallet fork of electri forklift needs in time declining, now, it is not necessary to fluid drives, and the decline of pallet fork then needs load
Deadweight realize.The control fluid of the proportion pilot valve module 15 in left side enters the first containing cavity 20, promotes main valve plug
4 move right, and meanwhile, the control valve 2 through the first valve block 1 junction controls the unidirectional of the second valve block 9 junction
Oil pocket release fluid on rear side of valve 7, now, the valve of check valve 7 is opened, and the fluid of loading cylinders connects from loading cylinders
Refluxing at mouth 6, the first via flow back into oil return opening 6 through main valve plug 4 and takes back fuel tank, and the second road binders liquid is through load pressure feedback
Oil circuit 8 flows in the 3rd containing cavity 12, and the pressure of loading cylinders thus feeds back on small valve core 13, and by small valve core 13
Produce the thrust end to main valve plug 4.Guide's fluid in first containing cavity 20 produces thrust to main valve plug 4
F1, the spring force of the second containing cavity 14 inner spring 19 is F2, loading cylinders feedback effect thrust on small valve core 13
For F3, the spring force of little spring 11 is F4, now, F1=F2+F3+F4, and main valve plug 4 stops mobile, now valve port
Keep certain aperture.Therefore, in the case of proportion pilot pressure size is constant, when i.e. F1 is constant, when load is got over
Time big, load pressure is the highest, produces thrust F3 on small valve core 13 the biggest, therefore, and spring force F2 and spring force F4
The least, i.e. the compression travel of spring 19 and little spring 11 is little, and the displacement that main valve plug 4 moves is the least, the oil return of oil sump tank
The valve port opening that mouth 6 is formed with main valve plug 4 is the least.In other words, when the load is large, the decrease speed of pallet fork is the least.
Otherwise, in the case of proportion pilot pressure size is constant, when i.e. thrust F1 is constant, when load more hour load pressure
The lowest, produce thrust F3 on small valve core 13 the least, therefore spring force F2 and spring force F4 is the biggest, i.e. spring 19
Big with the compression travel of little spring 11, the displacement that main valve plug 4 moves is the biggest, oil return opening 6 and the main valve plug 4 of oil sump tank
The valve port opening formed is the biggest.In other words, when the load is small, the decrease speed of pallet fork is the biggest.Thus it is automatically obtained weight
During load, decrease speed will not too fast and that decrease speed will not be the slowest when gently loading purpose.
Claims (4)
1. the load pressure feedback proportional multi-way valve on electri forklift, including valve body (3), main valve plug (4)
With guide's executive item, described main valve plug (4) is slidably fitted in the valve pocket (17) of valve body (3), guide's executive item
Being arranged in valve body (3), valve body (3) is provided with the oil-in (16) and oil return opening (6) connected with valve pocket (17)；
It is characterized in that: it also includes thrust balancing device and load pressure feedback device, described thrust balancing device is connected to main valve
The two ends of core (4), load pressure feedback device is arranged close to connect the valve body (3) of loading cylinders connector (5)
Side；Described guide's executive item is two proportion pilot valve modules (15), and two proportion pilot valve modules (15)
Communicate with the valve pocket at the thrust balancing device at main valve plug (4) two ends respectively.
Load pressure feedback proportional multi-way valve on electri forklift the most according to claim 1, its feature exists
In: described thrust balancing device includes the first valve block (1), the second valve block (9), spring (19) and spring pad (18),
First valve block (1) is connected to valve body (3) side away from loading cylinders connector (5) and inside to be had first and houses
Chamber (20), the second valve block (9) is connected close to valve body (3) side of loading cylinders connector (5) and inside has
Second containing cavity (14), the two ends of main valve plug (4) are respectively protruding into the first containing cavity (20) and the second containing cavity (14)
In；The two ends of main valve plug (4) are equipped with spring (19) and spring pad (18), and spring pad (18) is socketed in main valve plug
(4) on, one end of spring (19) pushes against with spring pad (18), at the bottom of the hole of the other end and the first containing cavity (20)
Or push against at the bottom of the hole of the second containing cavity (14)；Load pressure feedback device be connected to the second valve block (9) upper and with master
The end of spool (4) pushes against or disengages；Two respective oil circuit controls of proportion pilot valve module (15) are respectively with
One containing cavity (20) connects with the second containing cavity (14).
Load pressure feedback proportional multi-way valve on electri forklift the most according to claim 2, its feature exists
In: described load pressure feedback device includes small valve core (13), little spring (11) and plug screw (10), the second valve block
(9) there is on the same axis of the second containing cavity (14) the 3rd containing cavity (12) connected with the second containing cavity (14),
One end of small valve core (13) is slidably connected at the second containing cavity (14) and the connectivity part of the 3rd containing cavity (12), another
End is socketed with one end of little spring (11), and the other end of little spring (11) is socketed on plug screw (10), plug screw (10)
It is threaded on the second valve block (9)；Load pressure feedback oil circuit (8) it is additionally provided with in second valve block (9), described negative
The one end carrying pressure feedback oil circuit (8) connects with the 3rd containing cavity (12), the other end and the load oil in valve body (3)
Cylinder connector (5) connects.
Load pressure feedback proportional multi-way valve on electri forklift the most according to claim 2, its feature exists
In: this proportional multi-way valve also includes that check valve (7) and control valve (2), described control valve (2) are arranged on the first valve
In the valve body (3) of block (1) side, check valve (7) is arranged on the valve body (3) of loading cylinders connector (5) side
In, and, spool one end of check valve (7) forms valve with the valve body (3) at loading cylinders connector (5) place,
The other end is connected with control valve (2) by oil circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510026413.1A CN104495709B (en) | 2015-01-20 | 2015-01-20 | Load pressure feedback proportional multi-way valve on electri forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510026413.1A CN104495709B (en) | 2015-01-20 | 2015-01-20 | Load pressure feedback proportional multi-way valve on electri forklift |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104495709A CN104495709A (en) | 2015-04-08 |
| CN104495709B true CN104495709B (en) | 2016-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510026413.1A Active CN104495709B (en) | 2015-01-20 | 2015-01-20 | Load pressure feedback proportional multi-way valve on electri forklift |
Country Status (1)
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| CN (1) | CN104495709B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564367B (en) * | 2016-10-20 | 2020-07-07 | 国网山东省电力公司菏泽供电公司 | Storage operation vehicle loading and unloading system and storage operation vehicle |
| CN111547648B (en) * | 2020-04-24 | 2024-05-03 | 安徽合力股份有限公司 | Hydraulic system for load maintenance of stacker |
| CN114623267B (en) * | 2022-03-23 | 2024-04-09 | 浙江海宏液压科技股份有限公司 | Electric control multi-way valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1982001748A1 (en) * | 1980-11-10 | 1982-05-27 | Reeves Jerry L | Load responsive flow control valve |
| CH636931A5 (en) * | 1979-04-12 | 1983-06-30 | Aroflex Ag | Proportional valve |
| DE29508392U1 (en) * | 1995-05-19 | 1995-08-10 | Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München | Electro-hydraulic lifting module |
| CN201560993U (en) * | 2009-04-30 | 2010-08-25 | 泸州江阳长江液压科技有限公司 | Balanced type load backfeed multiple directional control valve block |
| CN102444636A (en) * | 2010-09-30 | 2012-05-09 | 李金海 | Load sensitive pressure compensation multiway valve for excavator |
| CN102678649A (en) * | 2012-06-07 | 2012-09-19 | 龙工（上海）桥箱有限公司 | Half integral load-sensing multiway valve |
| CN203809393U (en) * | 2014-02-28 | 2014-09-03 | 宁波斯达弗液压传动有限公司 | Lifting valve element of multi-path valve |
| CN204417063U (en) * | 2015-01-20 | 2015-06-24 | 宁波高新协力机电液有限公司 | Load pressure feedback proportional multi-way valve on electri forklift |
-
2015
- 2015-01-20 CN CN201510026413.1A patent/CN104495709B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH636931A5 (en) * | 1979-04-12 | 1983-06-30 | Aroflex Ag | Proportional valve |
| WO1982001748A1 (en) * | 1980-11-10 | 1982-05-27 | Reeves Jerry L | Load responsive flow control valve |
| DE29508392U1 (en) * | 1995-05-19 | 1995-08-10 | Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München | Electro-hydraulic lifting module |
| CN201560993U (en) * | 2009-04-30 | 2010-08-25 | 泸州江阳长江液压科技有限公司 | Balanced type load backfeed multiple directional control valve block |
| CN102444636A (en) * | 2010-09-30 | 2012-05-09 | 李金海 | Load sensitive pressure compensation multiway valve for excavator |
| CN102678649A (en) * | 2012-06-07 | 2012-09-19 | 龙工（上海）桥箱有限公司 | Half integral load-sensing multiway valve |
| CN203809393U (en) * | 2014-02-28 | 2014-09-03 | 宁波斯达弗液压传动有限公司 | Lifting valve element of multi-path valve |
| CN204417063U (en) * | 2015-01-20 | 2015-06-24 | 宁波高新协力机电液有限公司 | Load pressure feedback proportional multi-way valve on electri forklift |
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|---|---|
| CN104495709A (en) | 2015-04-08 |
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