CN208251213U - Automatically controlled positive flow master control valve assembly - Google Patents
Automatically controlled positive flow master control valve assembly Download PDFInfo
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- CN208251213U CN208251213U CN201820839795.9U CN201820839795U CN208251213U CN 208251213 U CN208251213 U CN 208251213U CN 201820839795 U CN201820839795 U CN 201820839795U CN 208251213 U CN208251213 U CN 208251213U
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- valve
- mounting blocks
- spring terminal
- solenoid valve
- proportion magnetic
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Abstract
The utility model discloses a kind of automatically controlled positive flow master control valve assemblies, belong to technical field of engineering machinery.It solves existing for traditional positive flow main control valve in the prior art that development cost is high, sensitivity is low, inconvenient maintenance defect.Its main structure includes main control valve, the main control valve includes valve body valve rod assembly, solenoid valve mounting blocks and several proportion magnetic valves, the valve body valve rod assembly includes left valve barrel and right valve barrel, solenoid valve mounting blocks are each equipped on the left valve barrel and right valve barrel, several described proportion magnetic valves are inserted into respectively on solenoid valve mounting blocks.The utility model is mainly used in the engineering machinery such as excavator.
Description
Technical field:
The utility model belongs to technical field of engineering machinery, specifically, more particularly to a kind of automatically controlled positive flow main control valve
Assembly.
Background technique:
Multi-way valve is the core component of excavator hydraulic system, and multi-way valve has determined hydraulic pump to each hydraulic action element
Assignment of traffic when fuel feeding route and fuel system, more hydraulic actuators simultaneously operation and how to realize composite move, determines
Kinematics and dynamic (dynamical) characteristic when excavator operation, movement be preferential and cooperation, interflow fuel feeding and straight line walking etc..
Classify by flow control, the center hydraulic system of opening is divided into positive flow system and minus flow system.Minus flow system is logical
The pressure signal in acquisition main control valve before the throttle orifice of position is crossed to act on the variable regulating mechanism of pump, pumpage and pressure signal at
Inverse ratio.When normal work, the oil liquid for pumping discharge flows to executing agency by main control valve a part, and a part bypasses oil duct through center
Oil return.When controlling executing agency's deceleration, the oil liquid of executing agency is gone to reduce, is bypassed the oil increasing of oil duct oil return, throttling
Pressure rise before hole, this pressure signal act on pump, reduce pumpage；Conversely, being gone when controlling executing agency's acceleration
The oil increasing of executing agency, and the oil liquid through center bypass oil duct is reduced, lower pressure signal acts on the adjusting machine of pump
On structure, keeps the discharge capacity of pump big, match to meet the demand of the flow and executing agency of pump to flow.
In traditional positive flow system, the control signal of positive flow comes from guide's secondary pressure, and principle is by a series of
Shuttle valve or pressure sensor select highest secondary pressure signal go control main pump stroking mechanism.When handle displacement increases,
Secondary pilot pressure increases, and higher pressure signal acts on the regulating mechanism of pump, makes to pump swash plate angle increase, discharge capacity increases
Greatly；Conversely, secondary pilot pressure becomes smaller when handle displacement becomes smaller, the discharge capacity of pump becomes smaller, to meet flow and the execution of pump
Demand of the mechanism to flow matches.
Intelligent, energy conservation, it is comfortable, reliable be always excavator hydraulic system development trend, with China's base in recent years
The continuous development built, intelligence will obtain further development.
Summary of the invention:
In order to solve traditional positive flow main control valve in the prior art, there are development cost height, sensitivity are low, inconvenient maintenance
Disadvantage, the utility model provide a kind of automatically controlled positive flow master control valve assembly being different from the prior art, development cost is lower,
High sensitivity, convenient later maintenance.
To achieve the goals above, the utility model adopts the following technical solutions realization:
A kind of automatically controlled positive flow master control valve assembly, including main control valve, the main control valve include valve body valve rod assembly, solenoid valve
Mounting blocks and several proportion magnetic valves, the valve body valve rod assembly include left valve barrel and right valve barrel, the left valve barrel and right valve
Solenoid valve mounting blocks are each equipped on body, several described proportion magnetic valves are inserted into respectively on solenoid valve mounting blocks.
Further, the solenoid valve mounting blocks include two non-spring terminal solenoid valve mounting blocks and two spring terminal electromagnetism
Valve mounting blocks are equipped at one spring terminal solenoid valve at non-spring terminal solenoid valve mounting blocks and one by bolt on left valve barrel and install
Block is equipped at one spring terminal solenoid valve mounting blocks at non-spring terminal solenoid valve mounting blocks and one by bolt on right valve barrel.
Further, more than one is equipped on the non-spring terminal solenoid valve mounting blocks and spring terminal solenoid valve mounting blocks
Guide's oil inlet P p, the C mouth of more than one oil return inlet T main valve stem related to more than one correspondence；The non-spring terminal
There are two class oil ducts inside solenoid valve mounting blocks and spring terminal solenoid valve mounting blocks, one is oil input channel, with guide's oil inlet P p phase
Even, two be back oil road, is connected with oil return inlet T.
Further, the valve body valve rod assembly further includes central by-passing valve and Ge Lian valve, and each valve that joins includes dipper one
Valve, multifunctional combination valve, swing arm bigeminy valve, revolution connection valve, left lateral walk to join valve, straight line walking connection valve, right lateral and walk to join valve, swing arm one
Valve, scraper bowl connection valve and dipper bigeminy valve；The center by-passing valve and Ge Lian valve are inserted into the lumen pore of left valve barrel and right valve barrel respectively
In.
Further, the proportion magnetic valve can be inserted vertically, to the left, to the right, forward or backward to non-spring terminal electricity
On magnet valve mounting blocks.
Further, the proportion magnetic valve can be inserted to spring terminal electromagnetism vertically, to the left, to the right, forward or backward
On valve mounting blocks.
Compared with prior art, the utility model has the beneficial effects that
1, intelligent: the application of proportion magnetic valve, so that the automatically controlled of main control valve becomes a reality, automatically controlled signal is more smart
Really, the intelligence of main control valve can also make corresponding hydraulic system further energy-saving；
2, lightweight: the application of proportion magnetic valve passes through a series of logical relation, so that it may when controlling composite move, respectively
The dominance relation of movement saves the various pressure-gradient control valve plug-in units in traditional main control valve, so that the further lightweight of main control valve；
3, reduce risks and assumptions: in traditional main control valve, realization and the utility model identical function need more several use of installation
Control the plug-in unit of assignment of traffic, the utility model can remove these plug-in units, thus related plug-in unit gives master control valve performance bring
Risks and assumptions, for example, due to valve inner remaining bulky grain caused by package card valve etc., also eliminate the need for；
4, facilitate after market service: the utility model makes master control valve arrangement further simple, and after market is asked
When topic, the factor that attendant needs to check is reduced, therefore after market service is more convenient；
5, cost reduces: with the development of related fields, the cost of proportion magnetic valve is being gradually reduced, the utility model
Main control valve, pilot line in complete machine hydraulic system and related auxiliary can be greatlyd save, and main control valve is greatly simplified, it is comprehensive
Cost reduces.
Detailed description of the invention:
Fig. 1 is the principles of the present invention figure；
Fig. 2 is the partial enlarged view in Fig. 1 at H；
Fig. 3 is the partial enlarged view in Fig. 1 at G；
Fig. 4 is the axonometric drawing of the utility model；
Fig. 5 is the structural schematic diagram of non-spring terminal solenoid valve mounting blocks in the utility model；
Fig. 6 is the structural schematic diagram of spring terminal solenoid valve mounting blocks in the utility model；
Fig. 7 is the part-structure schematic diagram of the cross-sectional view of A-A in Fig. 4；
Fig. 8 is the effect schematic diagram of proportion magnetic valve in the utility model；
Fig. 9 is traditional leading role schematic diagram；
Figure 10 is the arrangement one of proportion magnetic valve in the utility model；
Figure 11 is the arrangement two of proportion magnetic valve in the utility model；
Figure 12 is the working principle that the utility model is installed and used；
Figure 13 is the partial enlarged view in Figure 12 at K.
In figure: 1, central by-passing valve；2, one valve of dipper；3, multifunctional combination valve；4, swing arm bigeminy valve；5, revolution connection valve；
6, left lateral is walked to join valve；7, straight line walking connection valve；8, right lateral is walked to join valve；9, one valve of swing arm；10, scraper bowl joins valve；11, dipper bigeminy
Valve；12, non-spring terminal solenoid valve mounting blocks；13, left valve barrel；14, right valve barrel；15, spring terminal solenoid valve mounting blocks；16, oil return
Road；17, oil input channel；18, bolt connecting hole；20, valve rod end face I；21, valve rod I；22, spring I；23, valve rod end face II；24, valve
Bar II；25, spring II；31, the first proportion magnetic valve；32, the second proportion magnetic valve；33, third proportion magnetic valve；34, the 4th
Proportion magnetic valve；35, the 5th proportion magnetic valve；36, the 6th proportion magnetic valve；37, the 7th proportion magnetic valve；38, the 8th ratio
Solenoid valve；39, the 9th proportion magnetic valve；40, the tenth proportion magnetic valve；41, the 11st proportion magnetic valve；42, the 12nd ratio
Solenoid valve；43, the 13rd proportion magnetic valve；44, the 14th proportion magnetic valve；45, the 15th proportion magnetic valve；46, the ten six
Proportion magnetic valve；47, the 17th proportion magnetic valve；48, the 18th proportion magnetic valve；49, the 19th proportion magnetic valve；50, electric
Magnet valve；51, rotary motor；52, ECU controller；53, left electric hand handle；54, right electric hand handle.
Specific embodiment:
Below by specific embodiment and in conjunction with attached drawing, the utility model is described in further detail.
Embodiment 1:
As shown in Figs 1-4, a kind of automatically controlled positive flow master control valve assembly, including main control valve, the main control valve include valve body valve
Bar assembly, solenoid valve mounting blocks and several proportion magnetic valves, the valve body valve rod assembly include left valve barrel 13 and right valve barrel 14,
Solenoid valve mounting blocks are each equipped on the left valve barrel 13 and right valve barrel 14, several described proportion magnetic valves are inserted into electricity respectively
On magnet valve mounting blocks.
Embodiment 2:
The left valve barrel 13 and right valve barrel 14 are bolted, and the solenoid valve mounting blocks include two non-spring terminal electricity
Magnet valve mounting blocks 12 and two spring terminal solenoid valve mounting blocks 15, it is total that non-spring terminal solenoid valve mounting blocks 12 are mounted on valve body valve rod
Respectively joining valve in does not have one end of spring, and spring terminal solenoid valve mounting blocks 15, which are mounted on, respectively to be joined valve in valve body valve rod assembly and have spring
One end, spring terminal solenoid valve at non-spring terminal solenoid valve mounting blocks 12 and one is equipped at one by bolt on left valve barrel 13 and is pacified
Block 15 is filled, spring terminal solenoid valve at non-spring terminal solenoid valve mounting blocks 12 and one is equipped at one by bolt on right valve barrel 14 and is pacified
Fill block 15.The proportion magnetic valve is equipped with 19 altogether, non-spring terminal electromagnetism at spring terminal solenoid valve mounting blocks 15 and one at two
Inserting is there are five proportion magnetic valve respectively on valve mounting blocks 12, on another non-spring terminal solenoid valve mounting blocks 12 in place there are four insertings
Proportion magnetic valve, a reserved mounting hole are that other work of later period are ready, and 19 proportion magnetic valves are pacified by bolt
On spring terminal solenoid valve mounting blocks 15 and non-spring terminal solenoid valve mounting blocks 12.
As seen in figs. 5-6, non-spring terminal solenoid valve mounting blocks 12 and spring terminal solenoid valve mounting blocks 15 are connected by bolt
It connects hole 18 to be mounted on left valve barrel 13 and right valve barrel 14, D mouthfuls for installing each proportion magnetic valve；Non- spring terminal solenoid valve installation
E mouth on block 12 is spare mouth, goes out oil pressure for drawing nearest proportion magnetic valve, spring terminal solenoid valve mounting blocks 15 are not required to
Oil is extracted and guides to other places, rather than the needs of spring terminal solenoid valve mounting blocks 12 extract, then in complete machine hydraulic system
It is connected to other places, it is therefore desirable to increase E mouthfuls and be used as spare mouth.
As shown in fig. 7, being equipped with one on the non-spring terminal solenoid valve mounting blocks 12 and spring terminal solenoid valve mounting blocks 15
A above guide's oil inlet P p, the C mouth of more than one oil return inlet T main valve stem related to more than one correspondence；It is described non-
There are two class oil ducts inside spring terminal solenoid valve mounting blocks 12 and spring terminal solenoid valve mounting blocks 15, one is oil input channel 17, with elder generation
It leads oil inlet P p to be connected, the oil liquid of the inside is high-voltage oil liquid, and Pp pressure oil is provided by higher level's hydraulic system；Two be back oil road 16,
It is connected with oil return inlet T, the oil liquid of the inside is low pressure oil liquid, in the range of being not more than guide's oil inlet P p pressure, ratio electromagnetism
C mouthfuls of pressure are adjusted in valve, and C mouthfuls connect with the cavity of corresponding main valve stem one end.
The valve body valve rod assembly further includes central by-passing valve 1 and Ge Lian valve, and each valve that joins includes one valve 2 of dipper, more function
Valve 3 can be joined, swing arm bigeminy valve 4, revolution connection valve 5, left lateral walk to join valve 6, straight line walking connection valve 7, right lateral and walk to join valve 8, swing arm one
Valve 9, scraper bowl connection valve 10 and dipper bigeminy valve 11；Center by-passing valve 1 at one, institute are respectively provided in the left valve barrel 13 and right valve barrel 14
It states central by-passing valve 1 and Ge Lian valve is inserted into respectively in the lumen pore of left valve barrel 13 and right valve barrel 14.
19 proportion magnetic valves are respectively one to 19 proportion magnetic valve (31-49), and the first proportion magnetic valve 31 goes out
Mouth C is connect with one end of the valve rod of dipper bigeminy valve 11, the valve rod of the outlet C and dipper bigeminy valve 11 of the second proportion magnetic valve 32
The other end connection；The outlet C of third proportion magnetic valve 33 is connect with one end of the valve rod of scraper bowl connection valve 10, the 4th ratio electromagnetism
The outlet C of valve 34 is connect with the other end of the valve rod of scraper bowl connection valve 10；The outlet C and one valve of swing arm of 5th proportion magnetic valve 35
One end of 9 valve rod connects, and the outlet C of the 6th proportion magnetic valve 36 is connect with the other end of the valve rod of one valve 9 of swing arm；7th
The outlet C of proportion magnetic valve 37 is connect with the one end for the valve rod that right lateral walks to join valve 8, the outlet C of the 8th proportion magnetic valve 38 and the right side
The other end connection of the valve rod of walking connection valve 8；The one of the valve rod of outlet C and straight line the walking connection valve 7 of 9th proportion magnetic valve 39
End connection；The outlet C of tenth proportion magnetic valve 40 is connect with the one end for the valve rod that left lateral walks to join valve 6, the 11st proportion magnetic valve
41 outlet C is connect with the other end for the valve rod that left lateral walks to join valve 6；The outlet C and revolution connection valve 5 of 12nd proportion magnetic valve 42
Valve rod one end connection, the outlet C of the 13rd proportion magnetic valve 43 connect with the other end for joining the valve rod of valve 5 is turned round；Tenth
The outlet C of four proportion magnetic valves 44 is connect with one end of the valve rod of swing arm bigeminy valve 4, the outlet C of the 15th proportion magnetic valve 45
It is connect with the other end of the valve rod of swing arm bigeminy valve 4；The valve rod of the outlet C and multifunctional combination valve 3 of 16th proportion magnetic valve 46
One end connection, the outlet C of the 17th proportion magnetic valve 47 connect with the other end of the valve rod of multifunctional combination valve 3；18th ratio
The outlet C of example solenoid valve 48 is connect with one end of the valve rod of one valve 2 of dipper, the outlet C and bucket of the 19th proportion magnetic valve 49
The other end of the valve rod of one valve 2 of bar connects.After the oil return inlet T of described one to 19 proportion magnetic valves (31-49) is connected in parallel
Take back fuel tank；The oil inlet P p of one to 19 proportion magnetic valve (31-49) is connect after being connected in parallel with other working oil paths.
As shown in figs. 10-11, the proportion magnetic valve can be inserted to non-spring vertically, to the left, to the right, forward or backward
It holds on solenoid valve mounting blocks 12；The proportion magnetic valve can be inserted vertically, to the left, to the right, forward or backward to spring terminal electricity
On magnet valve mounting blocks 15.Other parts are same as Example 1.
As shown in figure 9, conventional hydraulic guide's main control valve, Ax mouthfuls are guide's hydraulic port with Bx mouthfuls, with higher level's hydraulic system
Pilot system connection, higher level's hydraulic system provide pressure oil, then pressure oil acts on valve rod end face I 20, and hydraulic coupling overcomes
The spring force of spring I 22 on valve rod I 21 pushes valve rod I 21 to act, to realize corresponding actions；The on-off and pressure of guide oil
Power size is directly provided by the handle in entire excavator hydraulic system.
As Figure 7-8, the C mouth of proportion magnetic valve is connected with the pilot port of main control valve valve rod II 24, and oil liquid is high pressure
When oily, high pressure oil is directly acted on valve rod end face II 23, and hydraulic coupling overcomes the spring force of the spring II 25 on valve rod II 24, is pushed away
Ovable valve stem II 24 acts, to realize corresponding actions.The size of guide's hydraulic oil passes through control by the ECU controller 52 of complete machine
Proportion magnetic valve is given.In the case where guide's oil inlet P p pressure is constant, the different electric current input of proportion magnetic valve is given, it can
To obtain different C mouth pressure, by A mouthfuls of control of pressure, it can be achieved that difference of the valve rod in stroke range is displaced, so as to
Control the different flow distribution of each actuator port of main control valve.
The working principle that the utility model is installed and used is for turning round:
As illustrated by figs. 12-13, after excavation operators enter driver's cabin, solenoid valve 50 is made to obtain electric, the pressure of pioneer pump first
Power oil P3 is by pipeline respectively and on two non-spring terminal solenoid valve mounting blocks 12 and two spring terminal solenoid valve mounting blocks 15
Oil inlet P p connection；Left electric hand handle 53, right electric hand handle 54, each proportion magnetic valve all pass through control line and 52 phase of ECU controller
Even.When the left electric hand handle 53 of operator's manipulation, which is turned left, to be deflected, ECU controller 52 starts to capture the intermediate conversion letter of left electric hand handle 53
Number (such as voltage U or resistance R) gives 43 input current signal I of the 13rd proportion magnetic valve, the 13rd ratio then by processing
Example solenoid valve 43 it is electric after, C mouth of the 13rd proportion magnetic valve 43 is connected by Pp2 mouthfuls with the pilot pressure P3 of system, export
Pilot pressure pushes the valve rod of main control valve revolution connection valve 5 mobile, and the right position of main control valve revolution connection valve 5 is connected, at this point, P1 pump
Pressure oil flows to the B mouth of rotary motor 51 after main control valve, and rotary motor 51 drives the restocking of excavator complete machine to turn left.When left electricity
When handle 53 goes back to middle position, left 53 conversion signal of electric hand handle output is zero, and the input signal of the 13rd proportion magnetic valve 43 is zero, the
The C mouth of 13 proportion magnetic valves 43 is communicated with oil return, no pressure, and the valve rod attonity of revolution connection valve 5 is in middle position, turns round horse
A, B mouth up to 51 is all communicated with oil return, and complete machine is acted without revolution.When the left electric hand handle 53 of operator's manipulation, which is turned right, to be deflected, ECU control
Device 52 processed starts to capture the intermediate conversion signal of left electric hand handle 53, then by processing, inputs to the 12nd proportion magnetic valve 42
Current signal I, the 12nd proportion magnetic valve 42 it is electric after, the C mouth of the 12nd proportion magnetic valve 42 passes through Pp1 mouthfuls and the elder generation of system
Pilot power P3 is connected, and exports pilot pressure, pushes the valve rod of main control valve revolution connection valve 5 mobile, the left position of main control valve revolution connection valve 5
It connects, at this point, the pressure oil of P1 pump flows to the B mouth of rotary motor 51 after the revolution connection valve 5 of main control valve, rotary motor 51 is driven
The restocking of excavator complete machine is turned right.
Wherein: the C mouthfuls of oil outlets for the corresponding related main valve stem of proportion magnetic valve, the Pp mouthfuls of oil inlets for proportion magnetic valve, T
Mouth is the oil return opening of proportion magnetic valve.
Signified proportion magnetic valve refers to one to 19 proportion magnetic valve (31-49) in text.
Claims (6)
1. a kind of automatically controlled positive flow master control valve assembly, including main control valve, it is characterised in that: the main control valve includes that valve body valve rod is total
At, solenoid valve mounting blocks and several proportion magnetic valves, the valve body valve rod assembly includes left valve barrel (13) and right valve barrel (14),
Solenoid valve mounting blocks are each equipped on the left valve barrel (13) and right valve barrel (14), several described proportion magnetic valves insert respectively
On solenoid valve mounting blocks.
2. automatically controlled positive flow master control valve assembly according to claim 1, it is characterised in that: the solenoid valve mounting blocks include
Two non-spring terminal solenoid valve mounting blocks (12) and two spring terminal solenoid valve mounting blocks (15), left valve barrel pass through bolt on (13)
Spring terminal solenoid valve mounting blocks (15) at non-spring terminal solenoid valve mounting blocks (12) and one are equipped at one, are led on right valve barrel (14)
It crosses bolt and is equipped at one spring terminal solenoid valve mounting blocks (15) at non-spring terminal solenoid valve mounting blocks (12) and one.
3. automatically controlled positive flow master control valve assembly according to claim 2, it is characterised in that: the non-spring terminal solenoid valve peace
More than one guide's oil inlet P p, more than one oil return are equipped on dress block (12) and spring terminal solenoid valve mounting blocks (15)
The C mouth of mouth T main valve stem related to more than one correspondence；The non-spring terminal solenoid valve mounting blocks (12) and spring terminal solenoid valve
There are two class oil ducts inside mounting blocks (15), one is oil input channel (17), is connected with guide's oil inlet P p, and two be back oil road (16),
It is connected with oil return inlet T.
4. automatically controlled positive flow master control valve assembly according to claim 3, it is characterised in that: the valve body valve rod assembly also wraps
Include central by-passing valve (1) and each valve, it is each join valve include one valve of dipper (2), multifunctional combination valve (3), swing arm bigeminy valve (4),
Revolution connection valve (5), left lateral walk to join valve (6), straight line walking connection valve (7), right lateral and walk to join valve (8), one valve of swing arm (9), scraper bowl connection
Valve (10) and dipper bigeminy valve (11)；The center by-passing valve (1) and each valve are inserted into left valve barrel (13) and right valve barrel respectively
(14) in lumen pore.
5. automatically controlled positive flow master control valve assembly according to claim 4, it is characterised in that: the proportion magnetic valve can erect
Directly, it inserts to the left, to the right, forward or backward onto non-spring terminal solenoid valve mounting blocks (12).
6. automatically controlled positive flow master control valve assembly according to claim 5, it is characterised in that: the proportion magnetic valve can erect
Directly, it inserts to the left, to the right, forward or backward onto spring terminal solenoid valve mounting blocks (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820839795.9U CN208251213U (en) | 2018-05-31 | 2018-05-31 | Automatically controlled positive flow master control valve assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820839795.9U CN208251213U (en) | 2018-05-31 | 2018-05-31 | Automatically controlled positive flow master control valve assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208251213U true CN208251213U (en) | 2018-12-18 |
Family
ID=64652258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820839795.9U Active CN208251213U (en) | 2018-05-31 | 2018-05-31 | Automatically controlled positive flow master control valve assembly |
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| CN (1) | CN208251213U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108589823A (en) * | 2018-05-31 | 2018-09-28 | 山东临工工程机械有限公司 | Automatically controlled positive flow master control valve assembly |
-
2018
- 2018-05-31 CN CN201820839795.9U patent/CN208251213U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108589823A (en) * | 2018-05-31 | 2018-09-28 | 山东临工工程机械有限公司 | Automatically controlled positive flow master control valve assembly |
| CN108589823B (en) * | 2018-05-31 | 2023-11-21 | 山东临工工程机械有限公司 | Main control valve assembly for electric control positive flow |
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