CN105526205B - Integral type pressure turns round coupling type 2D electro-hydraulic proportion reversing valves - Google Patents
Integral type pressure turns round coupling type 2D electro-hydraulic proportion reversing valves Download PDFInfo
- Publication number
- CN105526205B CN105526205B CN201610048145.8A CN201610048145A CN105526205B CN 105526205 B CN105526205 B CN 105526205B CN 201610048145 A CN201610048145 A CN 201610048145A CN 105526205 B CN105526205 B CN 105526205B
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- China
- Prior art keywords
- connecting portion
- electro
- elastic helix
- helix part
- bellows
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
- F16K11/085—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0603—Multiple-way valves
Abstract
Coupling type 2D electro-hydraulic proportion reversing valves are turned round the invention discloses a kind of integral type pressure, including reversal valve, proportion electro-magnet and pressure turn round shaft coupling；Pressure, which turns round shaft coupling, includes first connecting portion, second connecting portion, the first elastic helix part, the second elastic helix part, bellows, connecting portion, and installing plate；First elastic helix part is identical with the rotation direction of the second elastic helix part, and first connecting portion, second connecting portion, the first elastic helix part, the second elastic helix part, bellows, connecting portion, and installing plate are integrated.The beneficial effects of enforcing the present invention are：The 2D electro-hydraulic proportion reversing valves turn round the structure of shaft coupling using pressure, when armature promotes second connecting portion towards valve core movement, first elastic helix part and the second elastic helix part produce relative torsion to drive first connecting portion rotary motion, it has without friction transmission, flexible, the advantages of small volume and process and assemble are easy.
Description
Technical field
The present invention relates to electro-hydraulic proportional control system field, coupling type is turned round more specifically to a kind of integral type pressure
2D electro-hydraulic proportion reversing valves.
Background technology
Electro-hydraulic proportional valve is adoption rate control technology, a kind of liquid between switch type hydraulic valve and electrohydraulic servo valve
Press element.Because electro-hydraulic proportional valve can be combined with electronic-controlled installation, thus it is easy to transport various inputs, output signal
Calculation is handled, to realize the control function of complexity.Meanwhile, electro-hydraulic proportional valve has antipollution, low cost and fast response time etc. excellent
Point, is obtained a wide range of applications in the industrial production.
Existing electro-hydraulic proportion reversing valve typically can be using Direct Action Type and the design for leading two kinds of structures of control type.Direct Action Type
Electro-hydraulic proportion reversing valve directly drives valve element motion by proportion electro-magnet, and its is simple in construction, and can be worked under zero pressure, but
Big flow control can not be realized due to being limited by proportion electro-magnet thrust output.Control type electro-hydraulic proportion reversing valve is led by pilot valve control
The pressure change of main valve sensitive cavity processed, produces larger hydraulic static pressure-driven main valve plug motion, it is possible to achieve big flow is controlled,
But its is complicated, and it can not lead and worked under governor pressure zero.
The content of the invention
The technical problem to be solved in the present invention is, for prior art drawbacks described above there is provided a kind of high-pressure high-flow,
And integral type pressure simple in construction turns round coupling type 2D electro-hydraulic proportion reversing valves.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of integral type pressure and turn round coupling type 2D
Electro-hydraulic proportion reversing valve, including reversal valve and proportion electro-magnet；The reversal valve includes valve body, and in the valve body
Valve element；The proportion electro-magnet includes housing, and the armature in the housing；The 2D electro-hydraulic proportion reversing valves
The pressure for also including being used to connect the reversal valve and the proportion electro-magnet turns round shaft coupling；It is described pressure turn round shaft coupling include with it is described
First connecting portion that valve element is fixedly connected, the second connecting portion being fixedly connected with the armature, it is connected to the first connecting portion
The first elastic helix part and the second elastic helix part, telescopic bellows, projection between the second connecting portion is in institute
The connecting portion on the outer wall of the one end of second connecting portion away from the first connecting portion is stated, and is fixedly mounted on the valve body
Installing plate；
The first connecting portion is external diameter identical cylinder with the second connecting portion；The first elastic helix part with
The rotation direction of the second elastic helix part is identical, and the first elastic helix part and the second elastic helix part are respectively in institute
The projection stated on the same end face of first connecting portion is separated from each other；The bellows-sheathed is mounted in the first connecting portion and described the
The outside of two connecting portions, one end of the bellows is connected with the installing plate, the other end of the bellows and the connection
Portion is connected, and the bellows and the valve element, the first connecting portion, the second connecting portion, and the armature are same
Axle is set；The first connecting portion, the second connecting portion, the first elastic helix part, the second elastic helix part, institute
Bellows, the connecting portion are stated, and the installing plate is integrated；
When the armature promotes the second connecting portion towards the valve core movement, the connecting portion compresses the ripple
Manage, and the first elastic helix part produces relative torsion to drive the first connecting portion to revolve with the second elastic helix part
Transhipment is dynamic.
In integral type of the present invention pressure turns round coupling type 2D electro-hydraulic proportion reversing valves, the bellows is with many
The cylindrical hollow housing of individual transverse wave.
In integral type of the present invention pressure turns round coupling type 2D electro-hydraulic proportion reversing valves, the installing plate is included in just
The plate body of cube, and it is opened in the through hole at the plate body center；The first connecting portion can in the through hole stretching motion.
In integral type of the present invention pressure turns round coupling type 2D electro-hydraulic proportion reversing valves, the 2D electric-hydraulic proportions commutation
Valve also includes spring bullet support between the valve body and the connecting portion.
In integral type of the present invention pressure turns round coupling type 2D electro-hydraulic proportion reversing valves, the 2D electric-hydraulic proportions commutation
Valve also includes being sleeved on the bellows and the sleeve of the outside of the connecting portion；It is between the left end and installing plate of the sleeve
Radial seal, is end face seal between the right-hand member and housing of the sleeve.
In integral type of the present invention pressure turns round coupling type 2D electro-hydraulic proportion reversing valves, the sleeve is square knot
Structure, it offers circular inner hole.
The integral type pressure for implementing the present invention turns round coupling type 2D electro-hydraulic proportion reversing valves, has the advantages that：It is described
2D electro-hydraulic proportion reversing valves turn round the structure of shaft coupling using pressure, when armature promotes second connecting portion towards valve core movement, and first
Elastic helix part and the second elastic helix part produce relative torsion to drive first connecting portion rotary motion, so that by the straight of armature
Line moves the rotary motion for being changed into valve element, and compared with other electro-hydraulic proportion reversing valves, the 2D electro-hydraulic proportion reversing valves have nothing
Friction transmission, flexible, the advantages of small volume and process and assemble are easy；Furthermore, when reversal valve operating pressure is zero or during decompression,
Because now valve element axial resistance is almost nil, valve element can be pushed directly on by proportion electro-magnet completely, the spy of direct-acting valve is played
Point.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the internal junction that the integral type pressure that present pre-ferred embodiments are provided turns round coupling type 2D electro-hydraulic proportion reversing valves
Structure schematic diagram；
Fig. 2 is that the pressure in the 2D electro-hydraulic proportion reversing valves shown in Fig. 1 turns round the structure that shaft coupling is connected with valve element, armature respectively
Figure；
Fig. 3 be pressure in the 2D electro-hydraulic proportion reversing valves shown in Fig. 1 turn round that shaft coupling is connected with valve element, armature respectively it is another
Structure chart；
Fig. 4 is the local structural graph for pressing torsion shaft coupling in the 2D electro-hydraulic proportion reversing valves shown in Fig. 1；
Fig. 5 is the first elastic helix part and the second elastic helix part in the 2D electro-hydraulic proportion reversing valves shown in Fig. 1
Degree of disturbing sketch.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now compare accompanying drawing and describe in detail
The embodiment of the present invention.
As shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 4, presently preferred embodiments of the present invention provides a kind of integral type pressure and turns round coupling type
2D electro-hydraulic proportion reversing valves, it includes reversal valve 1, proportion electro-magnet 2, pressure and turns round shaft coupling 3, spring 4 and sleeve 5.
Specifically, as shown in Figure 1, Figure 2 and shown in Fig. 3, the reversal valve 1 includes valve body 11, and in valve body 11
Valve element 12.The proportion electro-magnet 2 includes housing 21, and the armature 22 in housing 21.Reversal valve 1 and proportion electro-magnet
2 be structure common in the art, be will not be repeated here.
If Fig. 2, Fig. 3, Fig. 4 are simultaneously as shown in fig.1, pressure torsion shaft coupling 3 is used for the armature 22 in proportion electro-magnet 2
Linear motion is changed into the rotary motion of the valve element 12 in reversal valve 1.Pressure is turned round shaft coupling 3 and connected including first connecting portion 31, second
Portion 32, the first elastic helix part 33, the second elastic helix part 34, bellows 35, connecting portion 36 and installing plate 37.First connection
Portion 31, second connecting portion 32, the first elastic helix part 33, the second elastic helix part 34, bellows 35, connecting portion 36, Yi Jian
Dress plate 37 is integrated, and its globality structure is preferably, relatively simple during 2D electro-hydraulic proportion reversing valves described in assembly and disassembly.
Wherein, such as Fig. 4 and refering to shown in Fig. 1, Fig. 2, the first connecting portion 31 is fixedly connected with valve element 12, second connection
Portion 32 is fixedly connected with armature 22, and first connecting portion 31 is external diameter identical cylinder with second connecting portion 32.First elasticity
Helical member 33 and the second elastic helix part 34 are connected between first connecting portion 31 and second connecting portion 32, namely first
Elastic helix part 33 is connected to the both ends of the surface adjacent with second connecting portion 32 of first connecting portion 31, and the second elastic helix part 34 is same
It is connected to the both ends of the surface adjacent with second connecting portion 32 of first connecting portion 31.In the present embodiment, the first elastic helix part 33 and
The rotation direction of two elastic helix parts 34 is identical, and the first elastic helix part 33 and the second elastic helix part 34 are respectively in first connecting portion
Projection on 31 same end face is separated from each other, and this is projected as fan annular, and two projections are axisymmetricly set.The bellows 35 is
Cylindrical hollow housing with multiple transverse waves, its can under the drive of connecting portion 36 stretching motion.Bellows 35 is set with
In the outside of first connecting portion 31 and second connecting portion 32, its one end is connected with installing plate 37, and its other end connects with connecting portion 36
Connect, and bellows 35 and valve element 12, first connecting portion 31, second connecting portion 32, and armature 22 are coaxially disposed.The connecting portion
36 projections are on the outer wall of the one end of second connecting portion 32 away from first connecting portion 31, in the present embodiment, and connecting portion 36 is annulus
Structure.The installing plate 37 is fixedly mounted on valve body 11, to cause pressure turns round shaft coupling 3 to be fixedly mounted on reversal valve 1.This implementation
In example, installing plate 37 includes the plate body 371 in square, and is opened in the through hole 372 at the center of plate body 371, first connecting portion
31 can in through hole 372 stretching motion.When armature 22 promotes second connecting portion 32 to be moved towards valve element 12, connecting portion 36 compresses
Bellows 35, and the first elastic helix part 33 and the second elastic helix part 34 produce relative torsion to drive first connecting portion 31 to revolve
Transhipment is dynamic.
As shown in fig.5, in the present embodiment, it is preferable that the first elastic helix part 33 is phase with the second elastic helix part 34
Same structure, and reverse symmetry setting, its mathematical modeling are as follows：
X=φ r
L=ψ r
Wherein：
φ:First elastic helix part or the corresponding central angle of the second elastic helix part end on projection；
r：First elastic helix part or the corresponding radius of the second elastic helix part end on projection；
ψ：The corresponding central angle of any one section of conveyor screw end on projection on first elastic helix part or the second elastic helix part；
x：The corresponding arc length of central angle φ；
l：The corresponding arc length of central angle ψ；
θ：The angle that section is turned at first elastic helix part, the second elastic helix part x；
w：Amount of deflection at first elastic helix part, the second elastic helix part x；
δ：The dislocation distance of first elastic helix part and the second elastic helix part.
In Fig. 5, Δ l is the variable quantity of the corresponding arc length of central angle ψ.Above-mentioned mathematical modeling preferably reaction pressure can turn round shaft coupling
Degree of the disturbing situation of change after the first elastic helix part 33 and the expansion of the second elastic helix part 34 in device 3, makes the first elastic spiral shell
Rotating part 33 and the deformation energy of the second elastic helix part 34 are more fitted design requirement, and the effect that pressure turns round amplification reaches most preferably.
As shown in figure 1, the bullet support of spring 4 is between valve body 11 and connecting portion 36.The sleeve 5 is sleeved on bellows 35 with connecting
The outside of socket part 36, is radial seal between the left end and installing plate 37 of sleeve 5, right-hand member and the housing 21 of sleeve 5 are that end face is close
Envelope.Position-limiting action can be played for radial seal between the left end and installing plate 37 of sleeve 5, between the right-hand member and housing 21 of sleeve 5
For end face seal, it can preferably coordinate with proportion electro-magnet 2, be easy to the interchangeability of proportion electro-magnet 2.In the present embodiment, sleeve 5
For square structure, it offers circular inner hole, namely sleeve 5 is square-outside and round-inside structure.Using the structure of the sleeve 5, it can make
Torsion shaft coupling 3 must be pressed to be us shown firmly attached between reversal valve 1 and proportion electro-magnet 2.
The concrete operating principle of the 2D electro-hydraulic proportion reversing valves：When armature 22 promotes second connecting portion 32 towards valve element 12
During motion, because the structure of bellows 35 is limited, second connecting portion 32 can only move along a straight line, can effectively 32 sections of second connecting portion
Rotary motion.Structure between first elastic helix part 33 and the second elastic helix part 34 is similar to DNA double helical structure, this pair
It is straight that approximate right angled triangle two is constituted between helical structure axile displacement distance, circumferential arc length and structure length of run three
Relation between the arm of angle and hypotenuse, it is clear that because the length of helical structure is constant, when second connecting portion 32 is made by the push-and-pull of armature 22
Changed with making first connecting portion 31 be misplaced with second connecting portion 32, then necessarily make the first elastic helix part 33 and the second elasticity
The camber line distance of helical member 34 changes, i.e. relative torsion occurs for the first elastic helix part 33 and the second elastic helix part 34,
So as to drive the rotary motion of first connecting portion 31, to realize that the linear motion by armature 22 is changed into the rotary motion of valve element 12.With
Other electro-hydraulic proportion reversing valves are compared, and the pressure that pressure turns round shaft coupling 3 turns round transfer process in the absence of frictional force and gap, and misplace
Distance or force amplifying function can be joined by changing the double-spiral structure of the first elastic helix part 33 and the second elastic helix part 34
Number is adjusted.Furthermore, it is complete because now valve element axial resistance is almost nil when the operating pressure of reversal valve 1 is zero or during decompression
Valve element can be pushed directly on by proportion electro-magnet entirely, the characteristics of playing direct-acting valve.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (6)
1. a kind of integral type pressure turns round coupling type 2D electro-hydraulic proportion reversing valves, including reversal valve (1) and proportion electro-magnet (2)；Institute
Stating reversal valve (1) includes valve body (11), and the valve element (12) in the valve body (11)；The proportion electro-magnet (2)
Including housing (21), and the armature (22) in the housing (21)；It is characterized in that：The 2D electric-hydraulic proportions commutation
The pressure that valve also includes being used to connect the reversal valve (1) and the proportion electro-magnet (2) turns round shaft coupling (3)；The pressure turns round shaft coupling
Device (3) includes the first connecting portion (31) being fixedly connected with the valve element (12), be fixedly connected with the armature (22) second
Connecting portion (32), the first elastic helix part being connected between the first connecting portion (31) and the second connecting portion (32)
(33) it is remote described in the second connecting portion (32) with the second elastic helix part (34), telescopic bellows (35), projection
Connecting portion (36) on the outer wall of one end of first connecting portion (31), and the installing plate being fixedly mounted on the valve body (11)
(37)；
The first connecting portion (31) is external diameter identical cylinder with the second connecting portion (32)；First elastic helix
Part (33) is identical with the rotation direction of the second elastic helix part (34), and the first elastic helix part (33) and second bullet
Projection of the property helical member (34) respectively on the same end face of the first connecting portion (31) is separated from each other；The bellows (35)
Be sleeved on the outside of the first connecting portion (31) and the second connecting portion (32), one end of the bellows (35) with it is described
Installing plate (37) is connected, and the other end of the bellows (35) is connected with the connecting portion (36), and the bellows (35) and
The valve element (12), the first connecting portion (31), the second connecting portion (32), and the armature (22) are coaxially set
Put；The first connecting portion (31), the second connecting portion (32), the first elastic helix part (33), second elasticity
Helical member (34), the bellows (35), the connecting portion (36), and the installing plate (37) are integrated；
The 2D electro-hydraulic proportion reversing valves also include being sleeved on the bellows (35) and the set of the outside of the connecting portion (36)
Cylinder (5)；Sleeve (5) two ends are connected with each other with installing plate (37) and housing (21) respectively；
When the armature (22) promotes the second connecting portion (32) to be moved towards the valve element (12), the connecting portion (36)
The bellows (35) is compressed, and the first elastic helix part (33) produces relative turn round with the second elastic helix part (34)
Turn to drive the first connecting portion (31) rotary motion.
2. integral type pressure according to claim 1 turns round coupling type 2D electro-hydraulic proportion reversing valves, it is characterised in that：The ripple
Line pipe (35) is the cylindrical hollow housing with multiple transverse waves.
3. integral type pressure according to claim 1 turns round coupling type 2D electro-hydraulic proportion reversing valves, it is characterised in that：The peace
Filling plate (37) includes the plate body (371) in square, and is opened in the through hole (372) at the plate body (371) center；Described
One connecting portion (31) can in the through hole (372) stretching motion.
4. integral type pressure according to claim 1 turns round coupling type 2D electro-hydraulic proportion reversing valves, it is characterised in that：The 2D
Electro-hydraulic proportion reversing valve also includes the spring (4) bullet support between the valve body (11) and the connecting portion (36).
5. integral type pressure according to claim 1 turns round coupling type 2D electro-hydraulic proportion reversing valves, it is characterised in that：The set
It is radial seal between one end of cylinder (5) and installing plate (37), is end face between the other end and housing (21) of the sleeve (5)
Sealing.
6. integral type pressure according to claim 5 turns round coupling type 2D electro-hydraulic proportion reversing valves, it is characterised in that：The set
Cylinder (5) is square structure, and it offers circular inner hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610048145.8A CN105526205B (en) | 2016-01-25 | 2016-01-25 | Integral type pressure turns round coupling type 2D electro-hydraulic proportion reversing valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610048145.8A CN105526205B (en) | 2016-01-25 | 2016-01-25 | Integral type pressure turns round coupling type 2D electro-hydraulic proportion reversing valves |
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| CN105526205A CN105526205A (en) | 2016-04-27 |
| CN105526205B true CN105526205B (en) | 2017-10-03 |
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| CN201610048145.8A Expired - Fee Related CN105526205B (en) | 2016-01-25 | 2016-01-25 | Integral type pressure turns round coupling type 2D electro-hydraulic proportion reversing valves |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110131229B (en) * | 2019-05-23 | 2020-08-04 | 浙江大学城市学院 | Torque motor direct control type plug-in mounting type two-dimensional electro-hydraulic proportional reversing valve |
| US11629417B2 (en) | 2020-03-12 | 2023-04-18 | Honda Motor Co., Ltd. | Noble metal free catalyst for hydrogen generation |
| CN112984198B (en) * | 2021-03-15 | 2022-03-18 | 浙江工业大学 | Two-dimensional half-bridge electro-hydraulic proportional reversing valve based on push rod middle-positioned roller coupling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205298130U (en) * | 2016-01-25 | 2016-06-08 | 浙江大学城市学院 | Integral type pressure -torsion shaft coupling type 2D electric -hydraulic proportional reversing valve |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4741364A (en) * | 1987-06-12 | 1988-05-03 | Deere & Company | Pilot-operated valve with load pressure feedback |
| CN102650305B (en) * | 2012-05-02 | 2015-01-28 | 浙江工业大学 | 2D hydraulic-power-assisted electro-hydraulic proportional reversing valve |
| CN102913496B (en) * | 2012-10-24 | 2015-03-04 | 浙江工业大学 | Bi-directional full-bridge 2D electro-hydraulic proportional directional valve |
| CN103256401A (en) * | 2013-04-27 | 2013-08-21 | 浙江工业大学 | Prestretching-pretwisting type full-bridge 2D electro-hydraulic proportional directional valve |
| CN103277531A (en) * | 2013-04-27 | 2013-09-04 | 浙江工业大学 | Pre-stretching-pre-twisting type simplified full-bridge 2D electro-hydraulic proportional reversing valve |
| CN103711945B (en) * | 2013-09-17 | 2016-03-09 | 浙江工业大学 | Monofocal prestretching-pretwist type full-bridge type 2D electro-hydraulic proportion reversing valve |
| CN104534124B (en) * | 2014-12-01 | 2017-01-18 | 浙江工业大学 | Displacement amplifying type 2D electro-hydraulic proportional directional valve |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205298130U (en) * | 2016-01-25 | 2016-06-08 | 浙江大学城市学院 | Integral type pressure -torsion shaft coupling type 2D electric -hydraulic proportional reversing valve |
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