CN109989956A - A kind of hydraulic valve and hydraulic system - Google Patents
A kind of hydraulic valve and hydraulic system Download PDFInfo
- Publication number
- CN109989956A CN109989956A CN201910237307.6A CN201910237307A CN109989956A CN 109989956 A CN109989956 A CN 109989956A CN 201910237307 A CN201910237307 A CN 201910237307A CN 109989956 A CN109989956 A CN 109989956A
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- China
- Prior art keywords
- hydraulic
- valve
- axis hole
- spool
- valve body
- Prior art date
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- 239000002828 fuel tank Substances 0.000 claims abstract description 9
- 230000003139 buffering effect Effects 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 238000010992 reflux Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/001—Servomotor systems with fluidic control
-
- 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
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Details Of Valves (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention discloses a kind of hydraulic valves and a kind of hydraulic system, hydraulic valve includes upper cover (1), spool (2) across upper cover (1), the valve pocket (3) being socketed on spool (2), the valve body (4) of bearing spool (2) sliding and the lower cover (5) being fixedly connected with valve body (4), valve body (4) is internal to be equipped with first shaft hole (41), the second axis hole (42) and third axis hole (43) from top to bottom, and the first buffer structure is equipped on valve body (4)；Hydraulic system includes above-mentioned hydraulic valve, hydraulic pump, the hydraulic cylinder (6) and fuel tank (7) connecting with the hydraulic valve.The present invention improves stability and reliability in the hydraulic valve course of work, effectively prevents the fluctuation generated in hydraulic cylinder commutation process and impact, improves the stability of hydraulic system.
Description
Technical field
The present invention relates to field of hydraulic control, and in particular to a kind of hydraulic valve and hydraulic system.
Background technique
Hydrauservo System makes the output quantity of system, such as displacement, speed or power, can automatically, quickly and accurately with
Change with the variation of input quantity, at the same time, output power is significantly amplified.Hydrauservo System is with its response speed
Fastly, unique advantages such as load stiffness is big, control power is big are widely used in Industry Control.Hydrauservo System
Core component be hydraulic efficiency servo-valve.
Common hydraulic efficiency servo-valve spool land part is traditionally arranged to be to maintain an equal level at valve body undercut groove, works in servo valve
In the process, the shoulder portion of spool can generate the suddenly change of flow.That is, the suddenly change of this flow is due to platform
What the suddenly change for the area that the linear structure of shoulder portion provides generated.This structure makes hydraulic efficiency servo-valve during the work time
It is easy to produce biggish transmitting fluctuation, causes system unstable.
Application No. is 200880012950.9 patents of invention to disclose a kind of pilot valve, comprising: (a) valve body, the valve
Body has entrance, refluxing opening and control pressure port, and the control pressure port and subsequent valving component are in fluid communication；(b) axis hole,
The axis hole is formed in the valve body and is in fluid communication with the entrance, refluxing opening and control each of pressure port；(c)
Spool, the spool are slidably supported in the axis hole of the valve body, the spool construction at control flow through it is described enter
Mouth, refluxing opening and the fluid flow for controlling pressure port, and change in the entrance and pressure refluxing opening when being moved at least
Thus the rate of change of area of one of them provides adjustable resistance to flowing through fluid therein, and reduces the quiet of the pilot valve
State power；(d) mobile device, the mobile device selectively makes spool in the axis hole, the entrance, refluxing opening and
Control pressure port moves about, so that distribution flows through fluid therein, to provide desired control pressure to subsequent valving component.
Application No. is 201510238990.7 patents of invention to disclose hydraulic efficiency servo-valve and Hydrauservo System, including valve
Body and spool are equipped with a boss at two shoulders of spool.
Foregoing invention patent is all located on spool the design of buffer structure, and the impact force that spool is subject to is still higher than valve body,
Abrasion is more easily caused, hydraulic valve is caused to be revealed.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of hydraulic valve and hydraulic systems, can reduce what spool was subject to
Impact, additionally it is possible to effectively reduce and prevent the fluctuation generated in hydraulic cylinder commutation process and impact, the present invention both can be adapted for
The case where big flow, high speed, it is also applied for microenvironment.The present invention adopts the following technical scheme:
A kind of hydraulic valve, including upper cover, across the spool of upper cover, the valve pocket being socketed on spool, bearing spool sliding
Valve body and positioned at bottom, the lower cover that is fixedly connected with the valve body, valve inner is equipped with first shaft hole, the second axis hole from top to bottom
With third axis hole, the first buffer structure is equipped on valve body.
Buffer structure is, reduction impact to spool, valve body gentle in order to change the switch conversion of valve, and raising is hydraulic
The stability of valve.
Preferably, first is respectively equipped between the second axis hole and first shaft hole, between the second axis hole and third axis hole
Buffer structure, the first buffer structure are ball, and spool is contacted with ball.Wherein first shaft hole, the second axis hole and third axis hole be not
The same side namely first shaft hole, the second axis hole and third axis hole all on spool are located on different vertical planes.Hydraulic
Multiple axis holes are opened on valve, are respectively communicated with the T chamber, A chamber and P chamber of hydraulic valve.Above-mentioned chamber is connected to hydraulic cylinder, is constituted stable
Hydraulic system.
The position of ball is the position where control mouth, and the movement of spool drives ball to roll opening for control control mouth
It closes.When control mouth is opened, the cambered surface of ball can generate drainage to the liquid in hydraulic valve, reduce the impact that spool is subject to
Power.Ball holder structure can be also equipped at ball, on the one hand for fixing ball, on the other hand for blocking fluid in hydraulic valve
Circulation.Buffer structure is set on valve body, can reduce the impact of spool being subject to, reduce its abrasion.
Preferably, the second buffer structure is additionally provided on spool.
Preferably, two shoulder portions on spool are respectively equipped with the second buffer structure, and the second buffer structure is first
Breeze way and the second breeze way, the distance between the first breeze way and the second breeze way are greater than or equal to the aperture of the second axis hole.
Namely two shoulders on spool close the second axis hole just, spool should have at the second axis hole and make
The function that lower two control mouths simultaneously close off or any control mouth is individually closed.
Preferably, the first breeze way and the second breeze way be configured as linear configuration or non-linear configurations or linear configuration and
The combination of non-linear configurations.Further, the first breeze way and the second breeze way include curved configuration, conical configuration, boss structure
Type etc..
Preferably, upper cover passes through bolt and is fixedly connected with the valve body, and lower cover is fixedly connected with the valve body by bolt.
A kind of hydraulic system, using above-mentioned hydraulic valve.Further refer to, is tied using above-mentioned first buffering that is equipped on valve body
The hydraulic valve of structure is equipped with the hydraulic of the second buffer structure using above-mentioned equipped with the first buffer structure on valve body and on spool
Valve.sheou
Preferably, hydraulic system further includes hydraulic pump and the hydraulic cylinder that connect with hydraulic valve, and hydraulic cylinder includes cylinder body, is located at
Cylinder interior is divided on mutual disconnected hydraulic cylinder by the piston of cylinder interior and piston rod for controlling piston motion, piston
Chamber and hydraulic cylinder cavity of resorption；Hydraulic pump is connected to by pipeline with hydraulic cylinder epicoele, and hydraulic cylinder epicoele is connected by pipeline and third axis hole
It is logical；Hydraulic cylinder cavity of resorption is connected to by pipeline with the second axis hole；First shaft hole is connected to by pipeline with fuel tank.
Preferably, piston rod is fixedly connected with the valve body.Piston rod, which moves up and down, drives valve body, causes two control mouths
Switch.
When in use, the pressure oil that hydraulic pump comes enters hydraulic system to hydraulic system of the present invention.In spool is in
When position, two control mouths are in closed state, and pressure oil does not circulate.When mechanical band movable valve plug moves upwards, lower control mouth
It opens, the pressure oil for filling with P chamber enters A chamber from lower control mouth, then flows to hydraulic cylinder cavity of resorption along the second axis hole and pipeline, pushes away
Piston bar moves upwards, so that the pressure oil of hydraulic cylinder epicoele flows back to P chamber along pipeline and third axis hole.Piston rod band moving valve
It moves upwards together, lower control mouth progressively closes off.During working herein, the movement velocity of piston rod and the opening of lower control mouth are big
It is small directly proportional.
Similarly, when spool moves downward, upper control mouth is opened, and pressure oil enters hydraulic cylinder epicoele, pushes piston rod
It moves downward, so that the pressure oil of hydraulic cylinder cavity of resorption flows into A chamber along pipeline and the second axis hole, enters T chamber using upper control mouth,
Finally fuel tank is flowed into along first shaft hole and pipeline.
Hydraulic cylinder is fixed, and piston rod is fixedly connected with valve body, when upper and lower control mouth opening, valve body and piston rod
It moves therewith, constitutes Hydrauservo System.Since valve body is equipped with the first buffer structure at upper and lower control mouth or valve body is equipped with
First buffer structure and spool are equipped with the second buffer structure, and can greatly reduce leads to valve body and valve because control mouth is thrown open
The impact force that core is subject to, opens or closes it gently, improves the stability of system.
The beneficial effects of the present invention are: the stability and reliability in the hydraulic valve course of work are improved, is effectively prevent
The fluctuation and impact generated in hydraulic cylinder commutation process, improves the stability of Hydrauservo System.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of hydraulic valve in embodiment 1；
Fig. 2 is the structural schematic diagram of hydraulic valve in embodiment 2；
Fig. 3 is the structural schematic diagram of hydraulic valve in embodiment 3；
Fig. 4 is the structural schematic diagram of hydraulic valve in embodiment 4；
Fig. 5 is the partial structurtes enlarged drawing of spool in embodiment 4；
Fig. 6 is the structural schematic diagram of Hydrauservo System；
Fig. 7 is the positional diagram of ball and ball support.
Appended drawing reference:
1, upper cover；2, spool；21, the first breeze way；22, the second breeze way；3, valve pocket；4, valve body；41, first shaft hole；
42, the second axis hole；43, third axis hole；440, ball；4401, ball holder structure；441, chamfering；45, upper control mouth；46, lower control
Mouthful；47, T chamber；48, A chamber；49, P chamber；5, lower cover；6, hydraulic cylinder；61, cylinder body；611, hydraulic cylinder epicoele；612, under hydraulic cylinder
Chamber；62, piston；63, piston rod；7, fuel tank.
Specific embodiment
Clear, complete description is carried out to technical solution of the present invention below in conjunction with embodiment, it is clear that described
Embodiment is only a part of the embodiment of the present invention, rather than whole embodiments.
Embodiment 1
Present embodiments provide a kind of hydraulic valve, as shown in Figure 1, from top to bottom, from-inner-to-outer include upper cover 1, pass through it is upper
The spool 2 of lid 1, the valve pocket 3 being socketed on spool 2, the valve body 4 and lower cover 5 that bearing spool 2 slides.Upper cover 1 passes through bolt and valve
Body 4 is fixedly connected, and lower cover 4 is fixedly connected by bolt with valve body 4.
First shaft hole 41, the second axis hole 42 and third axis hole 43 are equipped with inside valve body 4 from top to bottom.The second axis hole 42 with
The first buffer structure, the first buffer structure are respectively equipped between first shaft hole 41, between the second axis hole 42 and third axis hole 43
For ball 440, spool 2 is contacted with ball 440.
Ball holder structure 4401 can be also equipped at ball 440, on the one hand for fixing ball 440, on the other hand for hindering
The circulation of liquid in disconnected hydraulic valve.Ball 440 and the positional relationship of ball holder structure 4401 are as shown in Figure 7.
Embodiment 2
The present embodiment difference from example 1 is that, as shown in Fig. 2, the second axis hole 42 and first shaft hole 41 it
Between, the first buffer structure is respectively equipped between the second axis hole 42 and third axis hole 43, first buffer structure is chamfering 441.
Embodiment 3
The present embodiment difference from example 1 is that, as shown in figure 3, the hydraulic valve include the first buffer structure
With the second buffer structure.First buffer structure is disposed around between the second axis hole 42 and first shaft hole 41, the second axis hole 42 and third
Ball 440 between axis hole 43；Second buffer structure includes the first breeze way of two shoulder portions being respectively provided on spool 2
21 and second breeze way 22, the distance between the first breeze way 21 and the second breeze way 22 be greater than or equal to the hole of the second axis hole 42
Diameter.
First breeze way 21 and the second breeze way 22 are configured as linear configuration or non-linear configurations or linear configuration and non-
The combination of linear configuration.In the present embodiment, the first breeze way 21 and the second breeze way 22 be configured as it is arc-shaped.
Embodiment 4
The present embodiment and embodiment 3 the difference is that, as shown in figure 4, the second buffer structure includes being respectively provided at valve
The first breeze way 21 and the second breeze way 22 of two shoulder portions on core 2, shown in valve core structure such as Fig. 5 (a), the first buffering
The distance between section 21 and the second breeze way 22 are greater than or equal to the aperture of the second axis hole 42.First breeze way 21 and the second buffering
The combination for being configured as linear configuration or non-linear configurations or linear configuration and non-linear configurations of section 22.As shown in Fig. 5 (b),
In the present embodiment, the first breeze way 21 and the second breeze way 22 are configured as projection shape.
Embodiment 5
As shown in fig. 6, a kind of hydraulic system, including but not limited to hydraulic valve described in above-described embodiment 1-4, further include
Hydraulic pump, the hydraulic cylinder 6 connecting with hydraulic valve and fuel tank 7, hydraulic cylinder 6 include cylinder body 61, the piston 62 being located inside cylinder body 61
With the piston rod 63 for controlling the movement of piston 62, piston 62 will be divided into mutual disconnected hydraulic cylinder epicoele 611 inside cylinder body 61
With hydraulic cylinder cavity of resorption 612；Piston rod 63 is fixedly connected with valve body 4.
Hydraulic pump is connected to by pipeline with hydraulic cylinder epicoele 611, and hydraulic cylinder epicoele 611 is connected by pipeline and third axis hole 43
It is logical；Hydraulic cylinder cavity of resorption 612 is connected to by pipeline with the second axis hole 42；First shaft hole 41 is connected to by pipeline with fuel tank 7.
When in use, the pressure oil that hydraulic pump comes enters hydraulic system to this hydraulic system.When spool 2 is in middle position, on
Control mouth 45, lower control mouth 46 are in closed state, and pressure oil does not circulate.When mechanical band movable valve plug 2 moves upwards, lower control
Donsole 46 is opened, and the pressure oil for filling with P chamber 49 enters A chamber 47 from lower control mouth 46, then along the second axis hole 42 and pipeline stream
To hydraulic cylinder cavity of resorption 612, piston rod 63 is pushed to move upwards, so that the pressure oil of hydraulic cylinder epicoele 611 is along pipeline and third axis
P chamber 49 is flowed back in hole 43.Piston rod 43 moves upwards together with moving valve 4, and lower control mouth 46 progressively closes off.During working herein,
The movement velocity of piston rod 63 is directly proportional to the openings of sizes of lower control mouth 46.
Similarly, when spool 2 moves downward, upper control mouth 45 is opened, and pressure oil enters hydraulic cylinder epicoele 611, is pushed
Piston rod 63 moves downward, so that the pressure oil of hydraulic cylinder cavity of resorption 612 flows into A chamber 48 along pipeline and the second axis hole 42, using
Upper control mouth 45 enters T chamber 47, finally flows into fuel tank 7 along first shaft hole 41 and pipeline.
Hydraulic cylinder 6 is fixed, and piston rod 63 is fixedly connected with valve body 4, when upper control mouth 45, lower control mouth 46 open,
Valve body 4 and piston rod 63 also move therewith, constitute Hydrauservo System.Due to the buffering at upper control mouth 45, lower control mouth 46
Structure can greatly reduce the impact force that valve body 4 and spool 2 are subject to, open or close it gently, improve the stabilization of system
Property.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of hydraulic valve, it is characterised in that: including upper cover (1), pass through the spool (2) of the upper cover (1), be socketed in the valve
Valve pocket (3) on core (2), the lower cover for supporting the valve body (4) of the spool (2) sliding and being fixedly connected with the valve body (4)
(5), the valve body (4) is internal is equipped with first shaft hole (41), the second axis hole (42) and third axis hole (43) from top to bottom, described
Valve body (4) is equipped with the first buffer structure.
2. a kind of hydraulic valve according to claim 1, which is characterized in that first buffer structure is ball (440),
Between second axis hole (42) and the first shaft hole (41), second axis hole (42) and the third axis hole (43) it
Between be respectively equipped with a ball (440), the spool (2) contacts with the ball (440).
3. a kind of hydraulic valve according to claim 1, which is characterized in that be additionally provided with the second buffering on the spool (2)
Structure.
4. a kind of hydraulic valve according to claim 3, which is characterized in that two shoulder portions on the spool (2)
It is respectively equipped with second buffer structure, second buffer structure includes the first breeze way (21) and the second breeze way
(22), the distance between first breeze way (21) and second breeze way (22) are greater than or equal to second axis hole
(42) aperture.
5. a kind of hydraulic valve according to claim 4, which is characterized in that first breeze way (21) and described second is delayed
Rush being configured as with flowering structure or combinations thereof of section (22): linear configuration, non-linear configurations.
6. a kind of hydraulic valve according to claim 1, which is characterized in that the upper cover (1) passes through bolt and the valve body
(4) it is fixedly connected, the lower cover (4) is fixedly connected by bolt with the valve body (4).
7. a kind of hydraulic system, which is characterized in that use hydraulic valve according to claim 1 to 6.
8. a kind of hydraulic system according to claim 7, which is characterized in that further include that hydraulic pump and the hydraulic valve connect
The hydraulic cylinder (6) and fuel tank (7) connect；The hydraulic cylinder (6) includes cylinder body (61), is located at the internal piston of the cylinder body (61)
(62) and for controlling the piston (62) piston rod (63) moved；The piston (62) will be divided into inside the cylinder body (61)
Mutual disconnected hydraulic cylinder epicoele (611) and hydraulic cylinder cavity of resorption (612)；The hydraulic pump passes through pipeline and the hydraulic cylinder epicoele
(611) it is connected to, the hydraulic cylinder epicoele (611) is connected to by pipeline with third axis hole (43)；The hydraulic cylinder cavity of resorption (612) is logical
Pipeline is crossed to be connected to the second axis hole (42)；First shaft hole (41) is connected to by pipeline with fuel tank (7).
9. a kind of Hydrauservo System according to claim 8, which is characterized in that the piston rod (63) and valve body (4)
It is fixedly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237307.6A CN109989956B (en) | 2019-03-27 | 2019-03-27 | Hydraulic valve and hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237307.6A CN109989956B (en) | 2019-03-27 | 2019-03-27 | Hydraulic valve and hydraulic system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109989956A true CN109989956A (en) | 2019-07-09 |
| CN109989956B CN109989956B (en) | 2024-03-22 |
Family
ID=67131554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910237307.6A Active CN109989956B (en) | 2019-03-27 | 2019-03-27 | Hydraulic valve and hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109989956B (en) |
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| CN104653817A (en) * | 2015-01-22 | 2015-05-27 | 哈尔滨工程大学 | One-inlet three-outlet four-way reversing spherical valve |
| US20180120193A1 (en) * | 2015-04-20 | 2018-05-03 | Nexmatix Llc | System and method for leakage detection using a directional control valve |
| CN105114663A (en) * | 2015-08-20 | 2015-12-02 | 常德中联重科液压有限公司 | Dynamic reversing method for reversing valve, reversing valve and reversing valve structure |
| CN108457921A (en) * | 2017-02-21 | 2018-08-28 | 波音公司 | Shuttle valve with damping |
| CN108591158A (en) * | 2018-07-11 | 2018-09-28 | 中国船舶重工集团公司第七0四研究所 | A kind of high-pressure high-flow two-position four-way pilot operated directional control valve |
| CN210240165U (en) * | 2019-03-27 | 2020-04-03 | 银川市长城液压有限责任公司 | Hydraulic valve and hydraulic system |
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