CN114607672A - Slow release valve for oil cylinder - Google Patents
Slow release valve for oil cylinder Download PDFInfo
- Publication number
- CN114607672A CN114607672A CN202210266897.7A CN202210266897A CN114607672A CN 114607672 A CN114607672 A CN 114607672A CN 202210266897 A CN202210266897 A CN 202210266897A CN 114607672 A CN114607672 A CN 114607672A
- Authority
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- China
- Prior art keywords
- valve core
- slow release
- valve
- cover plate
- oil cylinder
- 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.)
- Pending
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- 239000007788 liquid Substances 0.000 claims description 8
- 238000009434 installation Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 52
- 239000010720 hydraulic oil Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Images
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
- 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
-
- 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
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
The invention provides a slow release valve for an oil cylinder. The slow release valve for the oil cylinder comprises a valve body, wherein a supporting seat and a valve core are installed in the valve body through internal threads, a sliding hole is formed in the valve core, an inner hexagonal screw rod penetrates through the sliding hole and is installed in the sliding hole in a sliding mode, a valve core cover plate is arranged on the inner wall of the inner hexagonal screw rod in a sliding sleeve mode, a circular groove is formed in the inner wall of the sliding hole, a spring is movably installed in the circular groove, the inner hexagonal screw rod penetrates through the spring and is movably connected with the spring, one end of the spring is in contact with the inner wall of one side of the circular groove, the other end of the spring is in contact with the valve core cover plate, and two hexagonal nuts are sleeved on one end of the valve core cover plate through threads. The slow release valve for the oil cylinder has the advantages of relatively simple structure, convenience in installation, rapidness and sensitivity in switching and reliability and stability in switching action.
Description
Technical Field
The invention relates to the technical field of hydraulic valves, in particular to a slow release valve for an oil cylinder.
Background
In some mechanical equipment driven by a hydraulic system, an oil cylinder or other executing elements have overpressure or pipeline aging, artificial damage and the like, when a pressure pipeline or a pipe joint is broken, the executing element can instantly lose backpressure, and at the moment, the loaded oil cylinder or executing element can rapidly fall in an uncontrolled manner, so that great potential safety hazards are easily caused.
However, the slow release valves in the prior art are relatively complex in structure, and some slow release valves are sensitive to switching, but due to the complex structure, the switching is not reliable enough, and the situation that the switching is not in place easily occurs.
Therefore, it is necessary to provide a slow release valve for a cylinder to solve the above technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the slow release valve for the oil cylinder, which has the advantages of relatively simple structure, convenient installation, rapid and sensitive switching and reliable and stable switching action.
In order to solve the technical problem, the slow release valve for the oil cylinder comprises a valve body, wherein a supporting seat and a valve core are arranged in the valve body through internal threads, a slide hole is arranged in the valve core, an inner hexagonal screw rod penetrates through the slide hole and is slidably installed in the slide hole, a valve core cover plate is slidably sleeved on the inner hexagonal screw rod, the inner wall of the sliding hole is provided with a circular groove, a spring is movably arranged in the circular groove, the inner hexagonal screw rod penetrates through the spring and is movably connected with the spring, one end of the spring is contacted with the inner wall of one side of the circular groove, the other end of the spring is contacted with the valve core cover plate, two hexagon nuts are sleeved on one end of the inner hexagon screw rod far away from the valve core cover plate in a threaded manner, a plurality of first oil passing holes distributed in an annular shape are formed in the supporting seat, and a plurality of second oil passing holes distributed in an annular shape are formed in the valve core.
Preferably, one end of the valve body is integrally formed with a liquid inlet nozzle, and an external thread is formed on the outer wall of the liquid inlet nozzle.
Preferably, a round hole is formed in the valve core cover plate, the inner hexagonal screw penetrates through the round hole and is in sliding connection with the inner wall of the round hole, two limiting grooves are symmetrically formed in the inner wall of the round hole, two limiting blocks are integrally formed in the outer wall of the inner hexagonal screw, and one ends, away from each other, of the two limiting blocks extend into the corresponding limiting grooves respectively.
Preferably, a plurality of third oil passing holes distributed annularly are formed in the valve core cover plate.
Furthermore, the valve core cover plate is rotatably sleeved with a sleeve cover, a plurality of fourth oil passing holes distributed in an annular shape are formed in the sleeve cover, a plurality of locking screws are installed on the sleeve cover through threads, and a limiting piece is installed on the valve core cover plate through threads.
Preferably, a plurality of internal thread holes distributed in an annular shape are formed in the outer ring of the sleeve cover, and the plurality of locking screws penetrate through the corresponding internal thread holes and are screwed with the corresponding inner walls of the internal thread holes.
Furthermore, an annular groove is formed in the outer ring of the valve core cover plate, an anti-skid ring is fixedly mounted in the annular groove, and one end, close to the inner hexagonal screw, of each of the locking screws extends into the annular groove and is in contact with the anti-skid ring.
Preferably, the anti-slip ring is made of rubber.
Compared with the related art, the slow release valve for the oil cylinder provided by the invention has the following beneficial effects:
the slow release valve for the oil cylinder has the advantages of simple structure, easiness in manufacturing, convenience in installation and low economic cost, and a supporting seat, a main valve core (comprising a valve core, an inner hexagonal screw, a spring, a valve core cover plate and the like) and the like can be directly installed in the valve body in a threaded manner; the slow release valve has only two working positions, and the switching of the positions is controlled by the pressure difference of the flow of the slow release valve, so the slow release valve not only has rapid and sensitive reversing, but also has reliable and stable reversing action.
Drawings
FIG. 1 is a schematic structural view of a first embodiment of a slow release valve for an oil cylinder provided by the invention;
FIG. 2 is a rear view of the valve cartridge cover plate shown in FIG. 1;
FIG. 3 is a schematic structural view of a slow release valve for an oil cylinder according to a second embodiment of the present invention;
FIG. 4 is a rear view of the valve cartridge cover plate shown in FIG. 2;
FIG. 5 is a schematic structural view of a third embodiment of a slow release valve for an oil cylinder provided by the invention;
FIG. 6 is an enlarged schematic view of portion A shown in FIG. 5;
FIG. 7 is a rear view of the cartridge cover plate shown in FIG. 5;
fig. 8 is a side view of the cartridge cover plate shown in fig. 6.
Reference numbers in the figures: 1. a valve body; 2. a supporting seat; 3. a valve core; 4. a slide hole; 5. an inner hexagonal screw; 6. a valve core cover plate; 7. a circular groove; 8. a spring; 9. a hexagonal nut; 10. a first oil passing hole; 11. a second oil passing hole; 12. a liquid inlet nozzle; 13. a third oil passing hole; 14. covering; 15. locking screws; 16. a fourth oil passing hole; 17. an annular groove; 18. an anti-slip ring; 19. a limiting sheet.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
First embodiment
Referring to fig. 1-2, in a first embodiment of the present invention, a slow release valve for an oil cylinder is a home position maintaining type, and includes a valve body 1, a support seat 2 and a valve core 3 are installed in the valve body 1 by internal threads, a slide hole 4 is axially formed at the center of the valve core 3, an inner hexagonal screw 5 is installed in the slide hole 4 in a penetrating and sliding manner, an inner hexagonal groove is formed at a screw head of the inner hexagonal screw 5 for facilitating insertion of an inner hexagonal wrench, a circular valve core cover plate 6 is slidably sleeved on the inner hexagonal screw 5, a circular groove 7 is formed on the inner wall of the slide hole 4, the circular groove 7 and the slide hole 4 are concentrically arranged, a spring 8 is movably installed in the circular groove 7, the inner hexagonal screw 5 penetrates the spring 8 and is movably connected with the spring 8, one end of the spring 8 contacts with the inner wall of one side of the circular groove 7, the other end of the spring 8 contacts with the valve core cover plate 6, under the elastic force of the spring 8, make spool apron 6 and the laminating of interior hexagonal screw 5's screw head, the threaded bush is equipped with two hexagon nuts 9 on the one end that interior hexagonal screw 5 kept away from spool apron 6, has seted up a plurality of first oilholes 10 of crossing that are the annular and distribute in the supporting seat 2, has seted up a plurality of second oilholes 11 of crossing that are the annular and distribute in the spool 3.
In order to facilitate connection with other elements in a hydraulic system, one end of the valve body 1 is integrally provided with a liquid inlet nozzle 12, and the outer wall of the liquid inlet nozzle 12 is provided with an external thread.
In order to be able to carry out spacingly to case apron 6, avoid its emergence to rotate, seted up the round hole in case apron 6, hexagon socket head cap screw 5 run through the round hole and with the inner wall sliding connection of round hole, two spacing grooves have been seted up to the symmetry on the inner wall of round hole, integrated into one piece is provided with two stoppers on hexagon socket head cap screw 5's the outer wall, the one end that two stoppers were kept away from each other extends to corresponding spacing inslot respectively.
In this embodiment:
the valve core 3, the spring 8 and the valve core cover plate 6 are connected together through the inner hexagonal screw 5 and the two hexagonal nuts 9 to form a main valve core of the slow release valve, the main valve core is further installed in the valve body 1 in a threaded manner and limited through the supporting seat 2 to form a complete hydraulic control valve, the valve core cover plate 6 leaves the valve core 3 under the action of the spring 8 in a natural state to maintain a certain opening degree of a valve port, the valve port has pressure difference due to liquid flowing, the pressure difference cannot exceed the elastic force of the spring 8 when an oil cylinder or an actuating element is in a normal working state, and the slow release valve is always kept in an open state;
when a high-pressure pipeline connected with an oil cylinder or an actuating element is broken, the flow passing through the valve body 1 is increased instantly due to pressure loss, the pressure difference acting force exceeds the elastic force of the spring 8, the valve core cover plate 6 can be attached to and kept by the valve core 3 instantly, so that the second oil passing holes 11 in the valve core 3 are blocked, the oil cylinder or the actuating element stays at the stroke position when the pipeline is broken, and hidden troubles caused by breakage are eliminated immediately; and after the oil cylinder or the execution element replaces the pipeline again, pressure oil is supplied to the oil cylinder again, and the slow release valve is opened again.
Compared with the related art, the slow release valve for the oil cylinder provided by the invention has the following beneficial effects:
the slow release valve for the oil cylinder provided by the invention has the advantages that the structure is simple, the manufacture is easy, the supporting seat 2, the main valve core (comprising the valve core 3, the inner hexagonal screw 5, the spring 8, the valve core cover plate 6 and the like) and the like can be directly installed in the valve body 1 in a threaded manner, the installation is convenient, and the economic cost is low; the slow release valve has only two working positions, and the switching of the positions is controlled by the pressure difference of the flow of the slow release valve, so the slow release valve not only has rapid and sensitive reversing, but also has reliable and stable reversing action.
Second embodiment:
based on the slow release valve for the oil cylinder provided by the first embodiment of the application, the second embodiment of the application provides another slow release valve for the oil cylinder. The second embodiment is merely a preferred mode of the first embodiment, and the implementation of the second embodiment does not affect the implementation of the first embodiment alone.
The second embodiment of the present invention will be further described with reference to the drawings and the following description.
Referring to fig. 3-4, the slow release valve for the cylinder in the present embodiment is of a slow descent type, and the only difference between the slow release valve for the cylinder in the present embodiment and the slow descent type provided in the first embodiment is that a plurality of third oil passing holes 13 are annularly distributed in the valve core cover plate 6, and the number of the third oil passing holes 13 is the same as that of the second oil passing holes 11 in the valve core 3, and the third oil passing holes 13 are in one-to-one correspondence.
In this embodiment:
in order to ensure that the hydraulic oil cylinder or the execution element can safely and slowly descend after the pipeline is broken, the valve core cover plate 6 is provided with a third oil passing hole 13 with a certain diameter, the third oil passing hole 13 is a flow limiting hole and has a damping effect, when the pipeline is broken, oil can slowly flow through the valve body 1, and therefore the load of the oil cylinder or the execution element can be slowly descended to the initial position, and the destructive effect caused by the broken pipeline can be eliminated.
The third embodiment:
based on the slow release valve for the oil cylinder provided by the second embodiment of the application, a third embodiment of the application provides another slow release valve for the oil cylinder. The third embodiment is only a preferable mode of the second embodiment, and the implementation of the third embodiment does not affect the implementation of the second embodiment alone.
Three embodiments of the present invention will be further described with reference to the accompanying drawings and embodiments.
Referring to fig. 5-8, the slow release valve for the cylinder in this embodiment is an adjustable slow-down type, and is different from the slow release valve for the cylinder in the second embodiment, the spool cover plate 6 is in a shape of a "convex", except that the same number of third oil passing holes 13 are also formed, the spool cover plate 6 is further rotatably sleeved with a sleeve cover 14, a plurality of annularly-distributed fourth oil passing holes 16 are formed in the sleeve cover 14, the number of the fourth oil passing holes 16 is the same as that of the third oil passing holes 13, and the fourth oil passing holes 16 are in one-to-one correspondence with each other, the sleeve cover 14 is rotated at a certain angle, so that the fourth oil passing holes 16 are misaligned or aligned with the corresponding third oil passing holes 13, when the alignment is performed, the resistance when hydraulic oil passes through is the smallest, and a user can adjust the misalignment degree of the fourth oil passing holes 16 and the corresponding third oil passing holes 13 according to his own needs, a plurality of locking screws 15 are installed to the screw thread on the upper cover plate 14, and is concrete, set up a plurality of internal thread holes that are the annular and distribute on the outer lane of upper cover plate 14, a plurality of locking screws 15 all run through corresponding internal thread hole and close mutually with the inner wall in corresponding internal thread hole soon, come to lock upper cover plate 14 through a plurality of locking screws 15, avoid upper cover plate 14 to take place to rotate by oneself, spacing piece 19 is installed to the screw thread on upper cover plate 6 of case, relieve the locking back to upper cover plate 14 again, spacing piece 19 can avoid upper cover plate 14 to break away from upper cover plate 6 of case.
In order to improve the reliability of locking the sleeve cover 14, in this embodiment, an annular groove 17 is formed in the outer ring of the valve core cover plate 6, an anti-slip ring 18 is fixedly mounted in the annular groove 17, the anti-slip ring 18 is made of rubber and can deform after being abutted by the locking screws 15, the friction force between the anti-slip ring and the locking screws 15 can be increased, and one ends of the locking screws 15, which are close to the hexagon socket screws 5, all extend into the annular groove 17 and contact with the anti-slip ring 18.
In this embodiment:
after the plurality of locking screws 15 are sequentially rotated anticlockwise by the screwdriver, the plurality of locking screws 15 can not tightly abut against the anti-slip ring 18, so that the locking of the sleeve cover 14 is released, then the sleeve cover 14 can be rotated by a certain angle, so that the dislocation degree of the plurality of fourth oil passing holes 16 and the corresponding third oil passing holes 13 is increased, the larger the dislocation degree is, the smaller the port through which the hydraulic oil passes, the slower the hydraulic oil or the execution element descends after the pipeline is broken, and relevant users can correspondingly adjust according to actual requirements.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A slow release valve for an oil cylinder comprises a valve body and is characterized in that a supporting seat and a valve core are arranged in the valve body through internal threads, a slide hole is arranged in the valve core, an inner hexagonal screw rod penetrates through the slide hole and is slidably installed in the slide hole, a valve core cover plate is slidably sleeved on the inner hexagonal screw rod, the inner wall of the sliding hole is provided with a circular groove, a spring is movably arranged in the circular groove, the inner hexagonal screw rod penetrates through the spring and is movably connected with the spring, one end of the spring is contacted with the inner wall of one side of the circular groove, the other end of the spring is contacted with the valve core cover plate, two hexagon nuts are sleeved on one end of the inner hexagon screw rod far away from the valve core cover plate in a threaded manner, a plurality of first oil passing holes distributed in an annular shape are formed in the supporting seat, and a plurality of second oil passing holes distributed in an annular shape are formed in the valve core.
2. The slow release valve for the oil cylinder according to claim 1, wherein a liquid inlet nozzle is integrally formed at one end of the valve body, and an external thread is formed on the outer wall of the liquid inlet nozzle.
3. The slow release valve for the oil cylinder according to claim 1, wherein a circular hole is formed in the valve core cover plate, the hexagon socket head cap screw penetrates through the circular hole and is slidably connected with the inner wall of the circular hole, two limiting grooves are symmetrically formed in the inner wall of the circular hole, two limiting blocks are integrally formed in the outer wall of the hexagon socket head cap screw, and the ends, away from each other, of the two limiting blocks extend into the corresponding limiting grooves respectively.
4. The slow release valve for the oil cylinder according to claim 3, wherein a plurality of third oil passing holes are annularly distributed in the valve core cover plate.
5. The slow release valve for the oil cylinder according to claim 4, wherein a sleeve cover is rotatably sleeved on the valve core cover plate, a plurality of fourth oil passing holes distributed annularly are formed in the sleeve cover, a plurality of locking screws are threadedly mounted on the sleeve cover, and a limiting piece is threadedly mounted on the valve core cover plate.
6. The slow release valve for the oil cylinder according to claim 5, wherein a plurality of annularly distributed internal thread holes are formed in an outer ring of the sleeve cover, and a plurality of locking screws penetrate through the corresponding internal thread holes and are screwed with the inner walls of the corresponding internal thread holes.
7. The slow release valve for the oil cylinder according to claim 5, wherein an annular groove is formed in an outer ring of the valve core cover plate, an anti-slip ring is fixedly installed in the annular groove, and one end of each of the plurality of locking screws, which is close to the hexagon socket head cap screw, extends into the annular groove and is in contact with the anti-slip ring.
8. The slow release valve for the oil cylinder according to claim 7, wherein the anti-slip ring is made of rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210266897.7A CN114607672A (en) | 2022-03-18 | 2022-03-18 | Slow release valve for oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210266897.7A CN114607672A (en) | 2022-03-18 | 2022-03-18 | Slow release valve for oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114607672A true CN114607672A (en) | 2022-06-10 |
Family
ID=81865454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210266897.7A Pending CN114607672A (en) | 2022-03-18 | 2022-03-18 | Slow release valve for oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114607672A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0771420A (en) * | 1993-09-02 | 1995-03-17 | Smc Corp | Pneumatic cylinder having cushion mechanism |
| CN2913704Y (en) * | 2006-03-09 | 2007-06-20 | 隋宝臣 | Diverter valve |
| CN102927189A (en) * | 2012-10-26 | 2013-02-13 | 中国人民解放军总后勤部建筑工程研究所 | Impulse slow-releasing device |
| CN202901148U (en) * | 2012-10-26 | 2013-04-24 | 中国人民解放军总后勤部建筑工程研究所 | Impulse controlled-release device |
| CN203081744U (en) * | 2013-03-13 | 2013-07-24 | 曹福林 | Helical rotor pump reverse rotation controlled-release device for oilfield underground oil production |
| CN204512574U (en) * | 2015-03-09 | 2015-07-29 | 重庆大众机械设备制造有限公司 | Rock gas double tower switches pressure slowly-releasing valve |
| US20170106901A1 (en) * | 2014-03-31 | 2017-04-20 | Shenzhen Zhixing Single-Axle Two-Wheeled Driving Technology Co., Ltd | Steering motor |
| CN207975271U (en) * | 2018-02-06 | 2018-10-16 | 杭州青流液压设备制造有限公司 | A kind of slow down type hydraulic slow release valve |
| CN207975063U (en) * | 2018-02-06 | 2018-10-16 | 杭州青流液压设备制造有限公司 | A kind of original position maintenance hydraulic slow release valve |
-
2022
- 2022-03-18 CN CN202210266897.7A patent/CN114607672A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0771420A (en) * | 1993-09-02 | 1995-03-17 | Smc Corp | Pneumatic cylinder having cushion mechanism |
| CN2913704Y (en) * | 2006-03-09 | 2007-06-20 | 隋宝臣 | Diverter valve |
| CN102927189A (en) * | 2012-10-26 | 2013-02-13 | 中国人民解放军总后勤部建筑工程研究所 | Impulse slow-releasing device |
| CN202901148U (en) * | 2012-10-26 | 2013-04-24 | 中国人民解放军总后勤部建筑工程研究所 | Impulse controlled-release device |
| CN203081744U (en) * | 2013-03-13 | 2013-07-24 | 曹福林 | Helical rotor pump reverse rotation controlled-release device for oilfield underground oil production |
| US20170106901A1 (en) * | 2014-03-31 | 2017-04-20 | Shenzhen Zhixing Single-Axle Two-Wheeled Driving Technology Co., Ltd | Steering motor |
| CN204512574U (en) * | 2015-03-09 | 2015-07-29 | 重庆大众机械设备制造有限公司 | Rock gas double tower switches pressure slowly-releasing valve |
| CN207975271U (en) * | 2018-02-06 | 2018-10-16 | 杭州青流液压设备制造有限公司 | A kind of slow down type hydraulic slow release valve |
| CN207975063U (en) * | 2018-02-06 | 2018-10-16 | 杭州青流液压设备制造有限公司 | A kind of original position maintenance hydraulic slow release valve |
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