CN205349898U - Two -way type 2D electric -hydraulic proportional reversing valve of symmetry full -bridge - Google Patents
Two -way type 2D electric -hydraulic proportional reversing valve of symmetry full -bridge Download PDFInfo
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- CN205349898U CN205349898U CN201620067513.9U CN201620067513U CN205349898U CN 205349898 U CN205349898 U CN 205349898U CN 201620067513 U CN201620067513 U CN 201620067513U CN 205349898 U CN205349898 U CN 205349898U
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Abstract
The utility model discloses a two -way type 2D electric -hydraulic proportional reversing valve of symmetry full -bridge, including switching -over valve, two proportion electro -magnets and two pressure -torsion shaft couplings, every proportion electro -magnet is connected with the case through the pressure -torsion shaft coupling respectively, the pressure -torsion shaft coupling includes first connecting portion, second connecting portion, first elasticity spiral component, second elasticity spiral component, bellows, connecting portion, and the mounting panel, first elasticity spiral component revolves to the same with second elasticity spiral component's. Implement the beneficial effects of the utility model are that: 2D electric -hydraulic proportional reversing valve adopts the structure of pressure -torsion shaft coupling, and when armature promoted the second connecting portion towards moving spool valve, first elasticity spiral component and second elasticity spiral component produced and twist reverse relatively in order to drive first connecting portion rotary motion, and it has zero friction transmission, flexible good, and advantages such as simple and convenient are assembled in small and processing.
Description
Technical field
This utility model relates to electro-hydraulic proportional control system field, more particularly, it relates to a kind of symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve.
Background technology
Electro-hydraulic proportional valve is adoption rate control technology, a kind of Hydraulic Elements between switch type hydraulic valve and electrohydraulic servo valve.Owing to electro-hydraulic proportional valve can combine with electronic-controlled installation, thus it is easy to various inputs, output signal are carried out calculation process, to realize the control function of complexity.Meanwhile, electro-hydraulic proportional valve has the advantages such as antipollution, low cost and fast response time, obtains a wide range of applications in the industrial production.
Existing electro-hydraulic proportion reversing valve generally can adopt Direct Action Type and lead the design of two kinds of structures of control type.Direct action type electrohydraulic proportional reversal valve is moved by proportion electro-magnet direct drive valve core, its simple in construction, and can work under zero pressure, but owing to big flow-control cannot be realized by the restriction of proportion electro-magnet thrust output.Lead control type electro-hydraulic proportion reversing valve to be changed by the pressure of pilot valve control bound sensitive cavity, produce the motion of bigger hydraulic static pressure-driven main valve plug, it is possible to achieve big flow-control, but its structure is complicated, and cannot lead zero and work under governor pressure.
Utility model content
The technical problems to be solved in the utility model is in that, for the drawbacks described above of prior art, it is provided that a kind of high-pressure high-flow, and the symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve of simple in construction.
This utility model solves its technical problem and be the technical scheme is that and construct a kind of symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve, and including reversal valve, two proportion electro-magnets being connected to described reversal valve two ends, and two pressures turn round shaft couplings；Described reversal valve includes valve body, and is arranged on the spool in described valve body；Each described proportion electro-magnet includes housing, and is arranged on the armature in described housing；Offering two pairs of left end pressure holes and two pairs of left end low pressure holes that radial symmetric is distributed on described spool left end shoulder, two pairs of described left end pressure holes communicate with system pressure mouth P mouth, and two pairs of described left end low pressure holes communicate with return pressure mouth T mouth；Described spool right-hand member offers and two pairs of left end pressure holes and two pairs of antisymmetric two pairs of right-hand member pressure holes in left end low pressure hole and two pairs of right-hand member low pressure holes；
Described valve inner offers left to be experienced passage and right experiences passage；When described 2D electro-hydraulic proportion reversing valve is in the initial position of balance, described left experience passage and two pairs of left end pressure holes and two pairs of left end low pressure holes form the first transfer area, described right experiencing passage and two pairs of described right-hand member pressure holes and two pairs of right-hand member low pressure holes form the second transfer area, described first transfer area is identical with described second transfer area；
Each described proportion electro-magnet is turned round shaft coupling respectively through described pressure and is connected with described spool；Each described pressure torsion shaft coupling includes fixing the first connecting portion being connected with described spool one end and fixes the second connecting portion being connected, the first elastic helix part being connected between described first connecting portion and described second connecting portion and the second elastic helix part, telescopic corrugated tube, projection with described armature at described second connecting portion away from the connecting portion on the outer wall of one end of described first connecting portion, and is fixedly mounted on the installing plate on described valve body；
Described first connecting portion is the cylinder that external diameter is identical with described second connecting portion；Described first elastic helix part is identical with the rotation direction of described second elastic helix part, and described first elastic helix part is separated from each other with the projection on the same end face of described first connecting portion respectively of described second elastic helix part；Described bellows-sheathed is contained in the outside of described first connecting portion and described second connecting portion, one end of described corrugated tube is connected with described installing plate, the other end of described corrugated tube is connected with described connecting portion, and described corrugated tube and described spool, described first connecting portion, described second connecting portion, and described armature is all coaxially disposed；Described first connecting portion, described second connecting portion, described first elastic helix part, described second elastic helix part, described corrugated tube, described connecting portion, and described installing plate is integrated；
When described armature promotes described second connecting portion towards described valve core movement, described connecting portion compresses described corrugated tube, and described first elastic helix part produces relative torsion to drive described first connecting portion rotary motion with described second elastic helix part.
In symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve described in the utility model, described corrugated tube is the cylindrical hollow housing with multiple transverse wave.
In symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve described in the utility model, described installing plate includes the plate body in square, and is opened in the through hole at described plate body center；Described first connecting portion can in described through hole stretching motion.
In symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve described in the utility model, described 2D electro-hydraulic proportion reversing valve also includes two springs；Each spring correspondence bullet holder is between described valve body and described connecting portion.
In symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve described in the utility model, described 2D electro-hydraulic proportion reversing valve also includes two sleeves；Each sleeve correspondence is sleeved on the outside of described corrugated tube and described connecting portion；One end of each described sleeve is fixing with described installing plate to be connected, and its other end is connected with described housing.
In symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve described in the utility model, described sleeve is square hollow structure.
Implement symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve of the present utility model, have the advantages that described 2D electro-hydraulic proportion reversing valve adopts pressure to turn round the structure of shaft coupling, when armature promotes the second connecting portion towards valve core movement, first elastic helix part and the second elastic helix part produce relative torsion to drive the first connecting portion rotary motion, thus the rectilinear motion of armature being become the rotary motion of spool, compared with other electro-hydraulic proportion reversing valve, the advantages such as described 2D electro-hydraulic proportion reversing valve has without friction transmission, flexible, and volume is little and process and assemble is easy；Furthermore, when reversal valve operating pressure is zero or decompression, owing to now spool axial resistance is almost nil, spool can be pushed directly on by proportion electro-magnet completely, play the feature of direct-acting valve.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the internal structure schematic diagram of the symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve that this utility model preferred embodiment provides；
Fig. 2 is the A portion enlarged drawing in Fig. 1；
Two pressures that Fig. 3 is in the 2D electro-hydraulic proportion reversing valve shown in Fig. 1 turn round the structure chart that shaft coupling is connected respectively with spool, armature；
Fig. 4 is the local structural graph that the pressure in the 2D electro-hydraulic proportion reversing valve shown in Fig. 1 turns round shaft coupling；
Fig. 5 is that the pressure in the 2D electro-hydraulic proportion reversing valve shown in Fig. 1 turns round the first elastic helix part of shaft coupling and degree of the disturbing sketch of described second elastic helix part.
Detailed description of the invention
In order to technical characteristic of the present utility model, purpose and effect are more clearly understood from, now comparison accompanying drawing describes detailed description of the invention of the present utility model in detail.In description of the present utility model, it is to be understood that term " first ", " second ", " left end ", " right-hand member " etc. only for descriptive purposes, and it is not intended that instruction or hint relative importance.
As shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 4, preferred embodiment of the present utility model provides a kind of symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve, and it includes reversal valve 1, proportion electro-magnet 2, pressure turn round shaft coupling 3, spring 4 and sleeve 5.
Specifically, as shown in Figure 1, Figure 2 and shown in Fig. 3, this reversal valve 1 includes valve body 11, and is arranged on the spool 12 in valve body 11.This spool 12 left end shoulder offers two pairs of left end pressure holes 121 and two pairs of left end low pressure holes 122 that radial symmetric is distributed, two pairs of left end pressure holes 121 communicate with system pressure mouth P mouth, two pairs of left end low pressure holes 122 communicate with return pressure mouth T mouth, A mouth and B mouth respectively actuator port.This spool 12 right-hand member offers and two pairs of left end pressure holes 121 and two pairs of antisymmetric two pairs of right-hand member pressure holes 123 in left end low pressure hole 122 and two pairs of right-hand member low pressure holes 124.Above-mentioned skew symmetry refers to, if two pairs of left end pressure holes 121 are on spool 12 axis, those two pairs of right-hand member pressure holes 123 are just under spool 12 axis, in like manner, if two pairs of left end low pressure holes 122 are under spool 12 axis, those two pairs of right-hand member low pressure holes 124 are just on spool 12 axis.This valve body 11 is internal to be offered and left experience passage 125 and right experience passage 126, described left experience passage 125 and communicates with spool 11 left end sensitive cavity, described right experience passage 126 and communicates with spool 11 right-hand member sensitive cavity.When 2D electro-hydraulic proportion reversing valve is in the initial position of balance, left experience passage 125 and two pairs of left end pressure holes 121 and two pairs of left end low pressure holes 122 form the first transfer area, right experiencing passage 126 and two pairs of right-hand member pressure holes 123 and two pairs of right-hand member low pressure holes 124 form the second transfer area, the first transfer area is identical with the second transfer area.
This proportion electro-magnet 2 is provided with two, and two proportion electro-magnets 2 are connected to the two ends of reversal valve 1.Each proportion electro-magnet 2 includes housing 21, and is arranged on the armature 22 in housing 21.In the present embodiment, each proportion electro-magnet is turned round shaft coupling 3 respectively through pressure and is connected with spool 12.Reversal valve 1 and proportion electro-magnet 2 structure that to be in prior art common, does not repeat them here.
Such as Fig. 2, Fig. 3, Fig. 4 and consult shown in Fig. 1, this pressure turns round shaft coupling 3 for the rectilinear motion of the armature 22 in proportion electro-magnet 2 becomes the rotary motion of the spool 12 in reversal valve 1.Pressure is turned round shaft coupling 3 and is included first connecting portion the 31, second connecting portion the 32, first elastic helix part the 33, second elastic helix part 34, corrugated tube 35, connecting portion 36 and installing plate 37.First connecting portion the 31, second connecting portion the 32, first elastic helix part the 33, second elastic helix part 34, corrugated tube 35, connecting portion 36, and installing plate 37 is integrated, its globality structure is better, relatively simple during 2D electro-hydraulic proportion reversing valve described in assembly and disassembly.
Wherein, such as Fig. 4 and consult shown in Fig. 1, Fig. 2, this first connecting portion 31 is fixing with one end of spool 12 to be connected, and this second connecting portion 32 is fixed with armature 22 and is connected, and the first connecting portion 31 is the cylinder that external diameter is identical with the second connecting portion 32.This first elastic helix part 33 and this second elastic helix part 34 are connected between the first connecting portion 31 and the second connecting portion 32, namely first elastic helix part 33 be connected to the both ends of the surface that the first connecting portion 31 is adjacent with the second connecting portion 32, the second elastic helix part 34 is again connected to the both ends of the surface that the first connecting portion 31 is adjacent with the second connecting portion 32.In the present embodiment, first elastic helix part 33 is identical with the rotation direction of the second elastic helix part 34, and first elastic helix part 33 and the projection on the same end face of the first connecting portion 31 respectively of the second elastic helix part 34 be separated from each other, this is projected as fan annular, and two projections are arranged axisymmetricly.This corrugated tube 35 is the cylindrical hollow housing with multiple transverse wave, its can under the drive of connecting portion 36 stretching motion.Corrugated tube 35 is sleeved on the outside of the first connecting portion 31 and the second connecting portion 32, and its one end is connected with installing plate 37, and its other end is connected with connecting portion 36, and corrugated tube 35 and spool the 12, first connecting portion the 31, second connecting portion 32, and armature 22 is all coaxially disposed.This connecting portion 36 projection is on second connecting portion 32 outer wall away from one end of the first connecting portion 31, and in the present embodiment, connecting portion 36 is circular ring structure.This installing plate 37 is fixedly mounted on valve body 11, so that pressure is turned round shaft coupling 3 and is fixedly mounted on reversal valve 1.In the present embodiment, installing plate 37 includes being the plate body 371 of square, and is opened in the through hole 372 at plate body 371 center, the first connecting portion 31 can in through hole 372 stretching motion.When armature 22 promotes the second connecting portion 32 to move towards spool 12, connecting portion 36 compress bellows 36, and the first elastic helix part 33 and the second elastic helix part 34 produce relative torsion to drive the first connecting portion 31 rotary motion.
Consult shown in Fig. 5, in the present embodiment, it is preferable that the first elastic helix part 33 and the second elastic helix part 34 are that identical structure reverse symmetry is arranged, and its mathematical model is as follows:
X=φ r
L=ψ r
Wherein:
φ: the first elastic helix part or central angle corresponding to the second elastic helix part end on projection；
R: the first elastic helix part or radius corresponding to the second elastic helix part end on projection；
The central angle that on ψ: the first elastic helix part or the second elastic helix part, any one section of spirillum end on projection is corresponding；
X: the arc length that central angle φ is corresponding；
L: the arc length that central angle ψ is corresponding；
The angle that θ: the first elastic helix part, the second cross section, elastic helix part x place turn over；
W: the first elastic helix part, the second elastic helix part x place amount of deflection；
The dislocation distance of the δ: the first elastic helix part and the second elastic helix part.
In Fig. 5, Δ l is the variable quantity of arc length corresponding for central angle ψ.Above-mentioned mathematical model reaction pressure can turn round the first elastic helix part 33 in shaft coupling 3 and degree of the disturbing situation of change after the expansion of the second elastic helix part 34 preferably, the deformation energy making the first elastic helix part 33 and the second elastic helix part 34 is fitted designing requirement more, and pressure is turned round the effect amplified and reached the best.
As shown in Figure 1 and Figure 2, this spring 4 is provided with two, and the corresponding bullet holder of each spring 4 is between valve body 11 and connecting portion 36.This sleeve 5 is again provided with two, and each sleeve 5 is sleeved on the outside of corrugated tube 35 and connecting portion 36, and one end of sleeve 5 is fixing with installing plate 37 to be connected, and the other end of sleeve 5 is connected with housing 21.In the present embodiment, sleeve 5 is square hollow structure.Adopt the structure of this sleeve 5, it is possible to make pressure turn round shaft coupling 3 and be us shown firmly attached between reversal valve 1 and proportion electro-magnet 2.
The specific works principle of described 2D electro-hydraulic proportion reversing valve: when armature 22 promotes the second connecting portion 32 to move towards spool 12, owing to the structure of corrugated tube 35 limits, the second connecting portion 32 can only rectilinear motion, can effectively limit the 32 sections of rotary motions of the second connecting portion.It is similar to that DNA double helical structure between first elastic helix part 33 and the second elastic helix part 34, this double-spiral structure axile displacement distance, two relations between right-angle side and hypotenuse of approximate right angled triangle are constituted between circumference arc length and structure length of run three, obviously, because the length of helical structure is constant, when the second connecting portion 32 is made the first connecting portion 31 and the dislocation of the second connecting portion 32 change by the push-and-pull action of armature 22, the camber line distance then necessarily making the first elastic helix part 33 and the second elastic helix part 34 changes, namely there is relative torsion in the first elastic helix part 33 and the second elastic helix part 34, thus driving the first connecting portion 31 rotary motion, to realize becoming the rectilinear motion of armature 22 rotary motion of spool 12.Such as, when reversal valve 1 right-hand member electric magnet 2 obtains electric, spool 12 will turn clockwise (from right-hand member electric magnet 2 in the face of the direction of valve body 11), now left end experiences passage 125 and the minimizing of left end pressure hole 121 transfer area, increases with left end low pressure hole 122 transfer area, and the left cavity pressure of spool 12 declines, in like manner, now right-hand member experiences passage 126 increases with right-hand member pressure hole 123 transfer area, reduces with right-hand member low pressure hole 124 transfer area, and the right cavity pressure of spool 12 raises.In the cavity pressure imbalance situation of left and right two, spool 12 will move to left, and along with spool 12 moves to left, turn round under the effect of shaft coupling 3 in pressure, spool 12 again will rotate (from right-hand member electric magnet 2 in the face of the direction of valve body 11) counterclockwise and return initial rest position, complete electrical-liquid control.In like manner, reversal valve 1 left end electric magnet 2 obtains electric, and spool 12 will move to right, and complete electrical-liquid control.Compared with other electro-hydraulic proportion reversing valve, pressure is turned round the pressure torsion transformation process of shaft coupling 3 and is absent from frictional force and gap, and the double-spiral structure parameter that the distance misplaced or force amplifying function can pass through to change the first elastic helix part 33 and the second elastic helix part 34 be adjusted.Furthermore, when reversal valve 1 operating pressure is zero or decompression, owing to now spool axial resistance is almost nil, spool can be pushed directly on by proportion electro-magnet completely, play the feature of direct-acting valve.
Above in conjunction with accompanying drawing, embodiment of the present utility model is described; but this utility model is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is merely schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; without departing under this utility model objective and scope of the claimed protection situation, it may also be made that a lot of form, these belong within protection of the present utility model.
Claims (6)
1. a symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve, it is characterized in that: include reversal valve (1), two proportion electro-magnets (2) being connected to described reversal valve (1) two ends, and two pressures turn round shaft coupling (3)；Described reversal valve (1) includes valve body (11), and is arranged on the spool (12) in described valve body (11)；Each described proportion electro-magnet (2) includes housing (21), and is arranged on the armature (22) in described housing (21)；Described spool (12) left end shoulder offers two pairs of left end pressure holes (121) and two pairs of left end low pressure holes (122) that radial symmetric is distributed, two pairs of described left end pressure holes (121) communicate with system pressure mouth P mouth, and two pairs of described left end low pressure holes (122) communicate with return pressure mouth T mouth；Described spool (12) right-hand member offers and two pairs of left end pressure holes (121) and two pairs of antisymmetric two pairs of right-hand member pressure holes (123) of left end low pressure hole (122) and two pairs of right-hand member low pressure holes (124)；
Described valve body (11) is internal to be offered and left experience passage (125) and right experience passage (126)；When described 2D electro-hydraulic proportion reversing valve is in the initial position of balance, described left experience passage (125) and two pairs of left end pressure holes (121) and two pairs of left end low pressure holes (122) form the first transfer area, described right experiencing passage (126) and two pairs of described right-hand member pressure holes (123) and two pairs of right-hand member low pressure holes (124) form the second transfer area, described first transfer area is identical with described second transfer area；
Each described proportion electro-magnet (2) is turned round shaft coupling (3) respectively through described pressure and is connected with described spool (12)；Each described pressure is turned round shaft coupling (3) and is included fixing the first connecting portion (31) being connected with described spool (12) one end, second connecting portion (32) that be connected fixing with described armature (22), it is connected to the first elastic helix part (33) between described first connecting portion (31) and described second connecting portion (32) and the second elastic helix part (34), telescopic corrugated tube (35), projection described second connecting portion (32) away from the connecting portion (36) on the outer wall of one end of described first connecting portion (31), and it is fixedly mounted on the installing plate (37) on described valve body (11)；
Described first connecting portion (31) and described second connecting portion (32) are the identical cylinder of external diameter；Described first elastic helix part (33) is identical with the rotation direction of described second elastic helix part (34), and described first elastic helix part (33) is separated from each other with the projection on the same end face of described first connecting portion (31) respectively of described second elastic helix part (34)；Described corrugated tube (35) is sleeved on the outside of described first connecting portion (31) and described second connecting portion (32), one end of described corrugated tube (35) is connected with described installing plate (37), the other end of described corrugated tube (35) is connected with described connecting portion (36), and described corrugated tube (35) and described spool (12), described first connecting portion (31), described second connecting portion (32), and described armature (22) is all coaxially disposed；Described first connecting portion (31), described second connecting portion (32), described first elastic helix part (33), described second elastic helix part (34), described corrugated tube (35), described connecting portion (36), and described installing plate (37) is integrated；
When described armature (22) promotes described second connecting portion (32) to move towards described spool (12), described connecting portion (36) compresses described corrugated tube (35), and described first elastic helix part (33) produces relative torsion to drive the rotary motion of described first connecting portion (31) with described second elastic helix part (34).
2. symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve according to claim 1, it is characterised in that: described corrugated tube (35) is the cylindrical hollow housing with multiple transverse wave.
3. symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve according to claim 1, it is characterized in that: described installing plate (37) includes the plate body (371) in square, and is opened in the through hole (372) at described plate body (371) center；Described first connecting portion (31) can in described through hole (372) stretching motion.
4. symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve according to claim 1, it is characterised in that: described 2D electro-hydraulic proportion reversing valve also includes two springs (4)；The corresponding bullet holder of each spring (4) is between described valve body (11) and described connecting portion (36).
5. symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve according to claim 1, it is characterised in that: described 2D electro-hydraulic proportion reversing valve also includes two sleeves (5)；Each sleeve (5) correspondence is sleeved on the outside of described corrugated tube (35) and described connecting portion (36)；One end of each described sleeve (5) is fixing with described installing plate (37) to be connected, and its other end is connected with described housing (21).
6. symmetrical full-bridge two-way type 2D electro-hydraulic proportion reversing valve according to claim 5, it is characterised in that: described sleeve (5) is square hollow structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620067513.9U CN205349898U (en) | 2016-01-25 | 2016-01-25 | Two -way type 2D electric -hydraulic proportional reversing valve of symmetry full -bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620067513.9U CN205349898U (en) | 2016-01-25 | 2016-01-25 | Two -way type 2D electric -hydraulic proportional reversing valve of symmetry full -bridge |
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| Publication Number | Publication Date |
|---|---|
| CN205349898U true CN205349898U (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620067513.9U Withdrawn - After Issue CN205349898U (en) | 2016-01-25 | 2016-01-25 | Two -way type 2D electric -hydraulic proportional reversing valve of symmetry full -bridge |
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| CN (1) | CN205349898U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465083A (en) * | 2016-01-25 | 2016-04-06 | 浙江大学城市学院 | Symmetrical full-bridge bi-directional 2D electro-hydraulic proportional reversing valve |
-
2016
- 2016-01-25 CN CN201620067513.9U patent/CN205349898U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465083A (en) * | 2016-01-25 | 2016-04-06 | 浙江大学城市学院 | Symmetrical full-bridge bi-directional 2D electro-hydraulic proportional reversing valve |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160629 Effective date of abandoning: 20171114 |