CN110594219A - One-way constant speed valve and speed-stabilizing hydraulic oil cylinder with same - Google Patents
One-way constant speed valve and speed-stabilizing hydraulic oil cylinder with same Download PDFInfo
- Publication number
- CN110594219A CN110594219A CN201910654150.7A CN201910654150A CN110594219A CN 110594219 A CN110594219 A CN 110594219A CN 201910654150 A CN201910654150 A CN 201910654150A CN 110594219 A CN110594219 A CN 110594219A
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- Prior art keywords
- valve
- guide hole
- cavity
- oil guide
- way constant
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- 239000010720 hydraulic oil Substances 0.000 title description 6
- 238000013016 damping Methods 0.000 claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000003921 oil Substances 0.000 description 83
- 230000008859 change Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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
- F15B13/027—Check 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention relates to a one-way constant speed valve which comprises a valve body, a left stop cover, a right stop cover, a throttle valve spring, a valve core and a first one-way valve, wherein a first cavity and a second cavity which are communicated with a left oil guide hole and a right oil guide hole are sequentially arranged in the valve body along the axial direction of the valve body, the valve core comprises a damping part and a throttling part which are connected with each other, the damping part is internally provided with a first oil guide hole, one end of the first oil guide hole, which is close to the left oil guide hole, is provided with a damping end face, a circular seam gap is arranged between the throttling part and the first cavity, and the throttling part is internally provided with an. The invention utilizes the throttle valve spring, the valve core and the first one-way valve in the valve body, so that the invention has better steady flow characteristic, after the valve core moves, the matching depth of the throttling part and the first cavity is adapted to the changed pressure, so that the flow is kept constant, when the pressure exceeds the adjusting range, the throttling part on the left side of the valve core is attached to the right side of the left stop cover, and the valve is overflowed by the gap between the attachment surfaces, the explosion-proof valve is started, and the invention has the function of the explosion-proof valve.
Description
Technical Field
The invention relates to an explosion-proof valve for a hydraulic oil cylinder, in particular to a one-way constant-speed valve and a speed-stabilizing hydraulic oil cylinder with the same.
Background
In the fields of engineering machinery and industry, particularly in the fields of cranes, jacks, continuous casting machines, elevators and the like, the piston rod is required to stably and smoothly move when falling back, and particularly an explosion-proof valve is often arranged at an oil port at the end of a rodless cavity, so that accidents caused by the fact that the piston rod is quickly retracted after the pipeline is exploded are avoided.
Under the normal condition, the retraction speed of the oil cylinder depends on the flow control of a system, after an external pipeline fails, the retraction speed depends on the load of a damping hole on an explosion-proof valve and the oil cylinder, the larger the load is, the higher the oil pressure is, the faster the retraction speed is, if the pressure is unstable in the retraction process, the impact vibration can be generated on the oil cylinder, and the flow stability is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a one-way constant-speed valve which has good flow stabilizing characteristic, stable flow, simple and compact structure and can play the role of an explosion-proof valve and a speed-stabilizing hydraulic oil cylinder with the one-way constant-speed valve, and is not influenced by pressure change.
The invention is realized by the following technical scheme: a one-way constant speed valve, which comprises a valve body, a left stop cover and a right stop cover which are respectively covered at the two ends of the valve body, the left stop cover and the right stop cover are respectively provided with a left oil guide hole and a right oil guide hole in sequence, and also comprise a throttle valve spring, a valve core and a first one-way valve, a first cavity and a second cavity communicated with the left oil guide hole and the right oil guide hole are sequentially arranged in the valve body along the axial direction of the valve body, the valve core comprises a damping part and a throttling part which are connected with each other, the damping part is arranged in the first cavity, a first oil guide hole is arranged in the damping part, and a damping end surface is arranged at one end of the damping part close to the left oil guide hole, one end of the throttling part is arranged in the first cavity, the other end of the throttling part is arranged in the second cavity, a circular seam gap is formed between the throttling part and the first cavity, an accommodating groove communicated with the first oil guide hole is formed in the throttling part, the first one-way valve is arranged in the accommodating groove, one end of the throttle valve spring is arranged in the first cavity, and the other end of the throttle valve spring is sleeved on the damping portion.
Furthermore, one end cover of the throttling part, which is far away from the damping part, is provided with a valve core cover, a second oil guide hole is formed in the valve core cover, and the accommodating groove is communicated with the right oil guide hole through the second oil guide hole.
Furthermore, the first check valve comprises a steel ball and a check valve spring which are connected with each other, the steel ball is arranged in the accommodating groove and close to one end of the first oil guide hole, and the check valve spring is arranged at the other end far away from the first oil guide hole and abuts against the valve core cover at one end far away from the steel ball.
Furthermore, one end of the throttle valve spring abuts against the left stop cover, and the other end of the throttle valve spring abuts against the end face, close to the damping part, of the throttling part.
Further, the inner diameter of the second lumen is larger than the inner diameter of the first lumen.
Further, the first cavity comprises a first cavity and a second cavity which are communicated with each other.
Further, the diameter of the damping part is smaller than the diameter of the throttling part and smaller than the inner diameter of the first cavity.
A speed-stabilizing hydraulic oil cylinder with a one-way constant-speed valve is provided with a rod cavity, a rodless cavity, a first one-way constant-speed valve and a second one-way constant-speed valve, wherein the first one-way constant-speed valve is installed at an oil port of the rod cavity, and the second one-way constant-speed valve is installed at an oil port of the rodless cavity.
The beneficial effects of the invention are as follows: the throttle valve has the advantages that the throttle valve spring, the valve core and the first one-way valve in the valve body are utilized, so that the throttle valve has better one-way steady flow characteristic, is simple and reliable in structure, and does not need redundant control ports and internal leakage ports; the flow control requirement of the system is simplified, and the system cost is reduced; the flow is stable, is not influenced by pressure change, has compact structure, can be additionally arranged outside the existing product, and carries out system upgrading or remanufacturing; because the annular gap is constant, after the valve core moves, the matching depth of the throttling part and the first cavity is adapted to the changed pressure, so that the flow is kept constant; when the pressure exceeds the adjusting range, the damping end face of the valve core is attached to the right end face of the left end cover, and the gap between the attachment faces overflows to start the explosion-proof valve.
Drawings
Fig. 1 is a schematic view of a one-way constant velocity valve;
FIG. 2 is a structural schematic diagram of a damping state of the one-way constant speed valve;
FIG. 3 is a schematic structural diagram of a jacking operation state of the one-way constant speed valve and oil cylinder system;
FIG. 4 is a schematic structural view of a descending operation state of the one-way constant speed valve and cylinder system;
FIG. 5 is a schematic view of the working state of the one-way constant speed valve;
FIG. 6 is a flow equation look-up table;
FIG. 7 is a schematic diagram of a speed stabilizing hydraulic cylinder with a one-way constant speed valve;
FIG. 8 is a schematic view of a prior art one-way throttle valve;
FIG. 9 is a schematic structural view of a prior art two-way flow valve;
in the figure: 1. a valve body; 11. a valve core cover; 12. a first cavity; 13. a second cavity; 14. a second chamber; 2. a left stop cover; 21. a left oil guide hole; 3. a right stop cover; 31. a right oil guide hole; 4. a throttle spring; 5. a valve core; 51. a damping part; 511. a first oil guide hole; 52. a throttle section; 6. a first check valve; 61. a steel ball; 62. a check valve spring; 71. a rod cavity; 72. a rodless cavity; 81. a first one-way constant speed valve; 82. a second one-way constant speed valve; 91. an oil pump; 92. and an oil tank.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention more readily understood by those skilled in the art, and thus will more clearly and distinctly define the scope of the invention. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.
As shown in fig. 1 and 2, a one-way constant velocity valve comprises a valve body 1, a left stop cover 2 and a right stop cover 3 covering both ends of the valve body 1, a throttle spring 4, a valve core 5 and a first one-way valve 6, wherein the left stop cover 2 and the right stop cover 3 are respectively provided with a left oil guide hole 21 and a right oil guide hole 31 in sequence, the valve body 1 is internally provided with a first cavity and a second cavity 14 which are communicated with the left oil guide hole 21 and the right oil guide hole 31 in sequence along the axial direction, the valve core 5 comprises a damping part 51 and a throttling part 52 which are connected with each other, the damping part 51 is arranged in the first cavity, the damping part 51 is provided with a first oil guide hole 511 and one end of the damping part close to the left oil guide hole 21 is provided with a damping end face, one end of the throttling part 52 is arranged in the first cavity and the other end is arranged in the second cavity 14, a circular seam gap is arranged between the throttling part 52 and the first cavity, in an initial state, the throttle value is 0, one end of the throttle part 52 close to the damping part 51 is flush with the right end of the first cavity, the throttle part 52 is internally provided with a receiving groove communicated with the first oil guide hole 511, the first check valve 6 is arranged in the receiving groove, one end of the throttle spring 4 is arranged in the first cavity, the other end of the throttle spring is sleeved on the damping part 51, it should be noted that the throttle spring 4 can be an elastic member and is not limited to the throttle spring 4, one end of the throttle part 52 far away from the damping part 51 is covered with the valve core cover 11, the valve core cover 11 is internally provided with a second oil guide hole through which the receiving groove is communicated with the right oil guide hole 31, the first check valve 6 comprises a steel ball 61 and a check valve spring 62 which are connected with each other, the steel ball 61 is arranged in the receiving groove and close to one end of the first oil guide hole 511, it should be noted that the first check valve 6 does not necessarily only comprise the steel ball 61 and the check valve spring 62 which are connected with, the structure of the check valve is only represented by a steel ball 61 and a check valve spring 62, the check valve spring 62 is arranged at the other end far away from the first oil guide hole 511, one end of the check valve spring 62 far away from the steel ball 61 abuts against the valve core cover 11, one end of the throttle valve spring 4 abuts against the left stop cover 2, the other end of the throttle valve spring abuts against the end surface of the throttling part 52 close to the damping part 51, the inner diameter of the second cavity 14 is larger than that of the first cavity, the first cavity comprises a first cavity 12 and a second cavity 13 which are communicated with each other, and the diameter of the damping part 51 is smaller than that of the throttling part 52 and smaller than that of the first cavity.
As shown in fig. 3 and 4, the working principle of the connection of the one-way constant speed valve and the oil cylinder system is that the left end of the one-way constant speed valve is connected with a system oil path, the right end of the one-way constant speed valve is connected with a cavity which needs to be adjusted by the oil cylinder, when the oil cylinder is supplied with oil by the system, the oil pressure passes through a left oil guide hole 21 of a left stop cover 2, sequentially passes through a first cavity 12, a second cavity 13 and a second cavity 14 in a valve body 1, pushes a steel ball 61 away through a first oil guide hole 511 on a valve core 5, passes through a second oil guide hole on a valve core cover 11, enters a rodless cavity 72 of; when the oil cylinder lifts heavy objects and needs to descend, oil pressure enters the valve body 1 from the right oil guide hole 31 of the right stop cover 3, and the check valve spring 62 and the steel ball 61 in the valve core 5 form the first check valve 6 at the moment, so that the oil pressure cannot pass through the first oil guide hole 511 on the valve core 5; at this time, a circular seam gap Ss exists between the outer circle of the throttling part 52 of the valve core 5 and the inner diameter of the second cavity 13, namely, a throttling gap, and the valve core 5 is pressed to push the throttle valve spring 4 to compress until the elastic force of the throttle valve spring 4 is balanced with the thrust generated by the oil pressure on the valve core 5, so that the flow rate is stabilized, namely, the descending speed of the oil cylinder is determined.
This valve characteristic was analyzed by the following theory:
as shown in fig. 5 and 6, analysis of the flow rate Q: generally, the three cases of the flow rate passing through the annular gap are shown in fig. 5, and the valve core 5 has a certain guide as shown in a structural diagram, so that the eccentric annular gap is mostly used in the actual use process. The theoretical calculation of the flow of the eccentric circular seam and the concentric circular seam is only in the difference of coefficients, the explanation is simple and convenient for explanation and calculation, the ideal state, namely the condition of the concentric circular seam, is analyzed, and the flow Q can be expressed as:
delta P-pressure difference, d-valve core external diameter, delta valve core external diameter and valve body internal hole clearance (namely Ss)
L-effective damping length mu-viscosity coefficient of oil
Wherein the content of the first and second substances,(k-spring stiffness coefficient)
Let the back pressure be 0, when Δ P ═ P
In summary, the following results can be obtained:
therefore, in the adjustable Lmax range, the flow rate is dependent on k and δ and is independent of the oil pressure P.
From the results of the derivation, it is understood that the valve of the present invention can determine a stable flow rate within a certain range by selecting the spring stiffness coefficient and the clearance, and the flow rate is not affected by the oil pressure P, as shown in fig. 2. The fluctuation of oil pressure P can be adjusted and compensated by a spring, the sensitivity can be calculated and set according to actual requirements, the valve core 5 is pushed to a limit position, and because the damping end face of the valve core 5 is tightly attached to the left oil guide hole 21, the hydraulic medium can only flow over through the plane of the end faces of the tightly attached damping part 51 and the left oil guide hole 21, namely, the hydraulic medium flows over through the damping end face, and the principle of the hydraulic medium overflowing device is the same as that of an explosion-proof valve, and the explosion-proof valve is started.
As shown in fig. 1, 2 and 7, the speed-stabilizing hydraulic cylinder with the one-way constant-speed valve comprises a rod cavity 71 and a rodless cavity 72, and further comprises a first one-way constant-speed valve 81 and a second one-way constant-speed valve 82, wherein the first one-way constant-speed valve 81 is installed at an oil port of the rod cavity 71, and the second one-way constant-speed valve 82 is installed at an oil port of the rodless cavity 72.
When oil pressure enters the oil cylinder from the left oil way through the one-way valve of the left speed stabilizing valve, the first one-way constant speed valve 81 does not work, the oil cylinder rises, and meanwhile, the oil cylinder extrudes the oil in the rod cavity 71 into the second one-way constant speed valve 82; the valve core 5 and the throttle valve spring 4 of the second one-way constant speed valve 82 stabilize the lifting speed of the oil cylinder, and the lifting speed is stable no matter the load of the oil cylinder because the speed for stabilizing the lifting speed is irrelevant to the oil pressure;
when oil pressure enters the oil cylinder from the right oil way through the one-way valve of the second one-way constant speed valve 82, the second one-way constant speed valve 82 does not work, the oil cylinder descends, and meanwhile, the oil cylinder extrudes the oil in the rodless cavity 72 into the first one-way constant speed valve 81; and a valve core 5 of the first one-way constant speed valve 81 is matched with a throttle valve spring 4 to stabilize the descending speed of the oil cylinder. The speed of the movement is independent of the oil pressure, so that the descending speed is stable regardless of the load of the oil cylinder.
When in useWhen (k1 is the stiffness system of the left valve springThe k2 is the stiffness coefficient of the right spring system, S71 is the effective action area of the rod cavity, and S72 is the effective action area of the rodless cavity), and the stretching speeds of the oil cylinders are the same; when the oil cylinder is impacted or overloaded, the valve core 5 is in the limit position, namely, the left end of the valve core 5 is attached to the left stop cover 2, and oil can only flow away through a plane gap to start the explosion-proof valve; this scheme can be reformed transform on current equipment, only need at hydro-cylinder oil port department install this valve additional can, with low costs, change fewly.
It should be noted that, although the present invention utilizes the principle of a throttle valve and a flow valve, and does not belong to the technical features that can be imagined without the inventive work, the one-way constant speed valve is distinguished from the one-way throttle valve:
1. when the hydraulic medium flows from C to D, the oil pressure pushes open the one-way valve, and the throttle valve does not start the throttling function;
2. when the hydraulic medium flows from D to C, the one-way valve is closed, the hydraulic medium can only flow through the opening, and the flow rate is 3 degrees, which is determined by the size and the pressure of the opening.
4. The one-way throttle valve cannot self-regulate the flow through pressure change, and the flow is changed along with the pressure change;
as shown in fig. 9, the one-way constant speed valve differs from the two-way flow valve in that:
1. the two-way flow valve is bidirectional throttling, and if the unidirectional throttling is performed, a one-way valve is additionally arranged;
2. the hydraulic medium of the two-way flow valve pushes the valve core 5 through F, and the size of the drift diameter is changed through the displacement of the valve core 5 to adjust the flow rate of the medium;
3. the valve core 5 of the two-way flow valve controls the opening change to be not linear;
4. the two-way flow valve has a complex structure and needs a pressure relief port E and a control port F;
5. compared with the invention, the valve has a large structure, is usually a plate-type valve, and is not suitable for the remanufacturing of a finished oil cylinder;
6. the two-way flow valve cannot replace an explosion-proof valve in most scenes;
compared with the prior art, the anti-explosion valve can be replaced under specific working conditions, has better flow stabilization characteristic than the anti-explosion valve, has simple and reliable structure, and does not need redundant control ports and internal discharge ports; the flow control requirement of the system is simplified, and the system cost is reduced; the flow is stable and is not influenced by pressure change, and the flow is determined by the determined spring stiffness coefficient and the annular seam clearance; the structure is compact, and the device can be additionally arranged outside the existing product to carry out system upgrading or remanufacturing; the annular gap is constant, the relation between the flow and the pressure is determined by the matching depth of the valve core 5 after moving, and the valve core is linearly changed and sensitive; when the pressure exceeds the adjusting range, the damping part 51 of the valve core 5 seals the oil outlet and starts the function of the explosion-proof valve.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (8)
1. The utility model provides a one-way constant speed valve, includes the valve body and covers respectively and close left locking lid and the right locking lid at the valve body both ends, left side locking lid and right locking are covered and are equipped with left side in proper order respectively and lead oilhole and right side and lead oilhole, its characterized in that: still include throttle valve spring, case and first check valve, be equipped with along its axial in proper order in the valve body and lead the first chamber and the second chamber that the oilhole link up each other with a left side, right side, the case includes interconnect's damping portion and throttle portion, the damping portion sets up in the first intracavity, has first oil guide hole in the damping portion and its one end that is close to left oil guide hole has the damping terminal surface, throttle portion one end sets up in the first intracavity and its other end sets up in the second intracavity, has the circumferential weld clearance between throttle portion and the first chamber, has the holding tank that communicates each other with first oil guide hole in the throttle portion, first check valve sets up in the holding tank, throttle valve spring one end sets up in the first intracavity and its other end cup joints on the damping portion.
2. A one-way constant velocity valve according to claim 1, wherein: one end of the throttling part, which is far away from the damping part, is covered with a valve core cover, a second oil guide hole is formed in the valve core cover, and the accommodating groove is communicated with the right oil guide hole through the second oil guide hole.
3. A one-way constant velocity valve according to claim 2, wherein: the first check valve comprises a steel ball and a check valve spring which are connected with each other, the steel ball is arranged in the accommodating groove and is close to one end of the first oil guide hole, and the check valve spring is arranged at the other end far away from the first oil guide hole and abuts against the valve core cover at one end far away from the steel ball.
4. A one-way constant velocity valve according to claim 2, wherein: one end of the throttle valve spring abuts against the left stop cover, and the other end of the throttle valve spring abuts against the end face, close to the damping part, of the throttling part.
5. A one-way constant velocity valve according to claim 1, wherein: the second lumen has an inner diameter greater than the inner diameter of the first lumen.
6. A one-way constant velocity valve according to claim 1, wherein: the first cavity comprises a first cavity and a second cavity which are communicated with each other.
7. A one-way constant velocity valve according to claim 1, wherein: the diameter of the damping part is smaller than that of the throttling part and smaller than the inner diameter of the first cavity.
8. A speed-stabilizing hydraulic cylinder with a one-way constant-speed valve according to any one of claims 1 to 7, which has a rod cavity and a rodless cavity, and is characterized by further comprising a first one-way constant-speed valve and a second one-way constant-speed valve, wherein the first one-way constant-speed valve is arranged at an oil port of the rod cavity, and the second one-way constant-speed valve is arranged at an oil port of the rodless cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910654150.7A CN110594219A (en) | 2019-07-19 | 2019-07-19 | One-way constant speed valve and speed-stabilizing hydraulic oil cylinder with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910654150.7A CN110594219A (en) | 2019-07-19 | 2019-07-19 | One-way constant speed valve and speed-stabilizing hydraulic oil cylinder with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110594219A true CN110594219A (en) | 2019-12-20 |
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ID=68852966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910654150.7A Pending CN110594219A (en) | 2019-07-19 | 2019-07-19 | One-way constant speed valve and speed-stabilizing hydraulic oil cylinder with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110594219A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0250574U (en) * | 1988-10-04 | 1990-04-09 | ||
| JP2001341659A (en) * | 2000-05-31 | 2001-12-11 | Koyo Seiko Co Ltd | Damper valve and hydraulic power steering device using it |
| CN201401385Y (en) * | 2009-04-30 | 2010-02-10 | 浙江安捷制动器有限公司 | Speed-limiting valve |
| CN201646610U (en) * | 2010-05-06 | 2010-11-24 | 中通汽车工业集团有限责任公司 | Automatic protection device of dump truck hydraulic pipeline |
| CN202646234U (en) * | 2011-12-13 | 2013-01-02 | 信义超薄玻璃(东莞)有限公司 | Hydraulic current-limiting safe explosion-proof valve |
| CN108105428A (en) * | 2017-12-21 | 2018-06-01 | 宁波文泽机电技术开发有限公司 | One-way throttle valve |
| CN210290316U (en) * | 2019-07-19 | 2020-04-10 | 无锡市汉为液压气动有限公司 | One-way constant speed valve and speed-stabilizing hydraulic oil cylinder with same |
-
2019
- 2019-07-19 CN CN201910654150.7A patent/CN110594219A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0250574U (en) * | 1988-10-04 | 1990-04-09 | ||
| JP2001341659A (en) * | 2000-05-31 | 2001-12-11 | Koyo Seiko Co Ltd | Damper valve and hydraulic power steering device using it |
| CN201401385Y (en) * | 2009-04-30 | 2010-02-10 | 浙江安捷制动器有限公司 | Speed-limiting valve |
| CN201646610U (en) * | 2010-05-06 | 2010-11-24 | 中通汽车工业集团有限责任公司 | Automatic protection device of dump truck hydraulic pipeline |
| CN202646234U (en) * | 2011-12-13 | 2013-01-02 | 信义超薄玻璃(东莞)有限公司 | Hydraulic current-limiting safe explosion-proof valve |
| CN108105428A (en) * | 2017-12-21 | 2018-06-01 | 宁波文泽机电技术开发有限公司 | One-way throttle valve |
| CN210290316U (en) * | 2019-07-19 | 2020-04-10 | 无锡市汉为液压气动有限公司 | One-way constant speed valve and speed-stabilizing hydraulic oil cylinder with same |
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