CN110594218A - Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure - Google Patents
Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure Download PDFInfo
- Publication number
- CN110594218A CN110594218A CN201910634257.5A CN201910634257A CN110594218A CN 110594218 A CN110594218 A CN 110594218A CN 201910634257 A CN201910634257 A CN 201910634257A CN 110594218 A CN110594218 A CN 110594218A
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- Prior art keywords
- valve
- expansion
- valve body
- flow guide
- guide hole
- 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.)
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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
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
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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
- F15B13/027—Check valves
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- 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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/04—Check valves with guided rigid valve members shaped as balls
- F16K15/042—Check valves with guided rigid valve members shaped as balls with a plurality of balls
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- 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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/04—Check valves with guided rigid valve members shaped as balls
- F16K15/044—Check valves with guided rigid valve members shaped as balls spring-loaded
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- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
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- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0245—Construction of housing; Use of materials therefor of lift valves with ball-shaped valve members
Abstract
The invention relates to an expansion valve core, a hydraulic lock structure with the expansion valve core and a sealing method of the hydraulic lock structure, wherein the hydraulic lock structure comprises a valve body, an expansion sleeve, a sealing ring, a gland and a first one-way valve, one end of the valve body is provided with a first flow guide hole along the axial direction of the valve body, an accommodating cavity and a flow channel which are mutually communicated are arranged in the valve body, the expansion sleeve is sleeved on the periphery of the valve body, the inner wall of the expansion sleeve is communicated with the accommodating cavity through the flow channel, the sealing ring is arranged between the expansion sleeve and the valve body, the gland is arranged at one end of the valve body, which is far away from the first flow guide hole, is provided with a second flow guide hole corresponding to the first flow guide hole, and the first one-. The fit clearance is influenced by oil pressure, the larger the oil pressure is, the larger the expansion amount of the expansion sleeve is, and the smaller the clearance between valve holes of the expansion valve core is, so that the acceleration of the leakage amount of the expansion valve core is slowed down or reversely increased, the installation space is saved, the machining error is reduced, and the precision requirement of machining equipment is lowered.
Description
Technical Field
The invention relates to a valve core for a hydraulic oil cylinder, in particular to an expansion valve core, a hydraulic lock structure with the expansion valve core and a sealing method of the hydraulic lock structure.
Background
The valve core is often used for various hydraulic components and is one of necessary hydraulic parts. There are two common conventional valve core sealing methods: the contact seal can enable the valve core to achieve zero leakage through the seal, but is limited by the space limit required by the installation of the seal, and the undersized valve core cannot use the contact seal; the contact type seal can generate friction force and is influenced by the cleanliness of oil, so that the service life of the contact type seal is greatly shortened; the clearance type seal meets the operating requirement of the working condition through a reasonable fit clearance and a sufficient throttling length. The clearance type sealed valve core and the valve hole need high processing precision and assembly requirements; the clearance seal always has leakage and is influenced by various factors such as the temperature of the system, the viscosity of oil and the like.
Therefore, a valve element and a hydraulic valve sealing method which can increase the leakage rate and increase the oil pressure reversely, save the installation space, reduce the machining error and reduce the precision of machining equipment are urgently needed.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides an expansion valve core, a hydraulic lock structure with the expansion valve core and a sealing method thereof, wherein the larger the oil pressure is, the larger the expansion amount of an expansion sleeve is, the smaller the gap between valve holes of the valve core is, the slower or the longer the leakage amount is, the installation space is saved, the machining error is reduced, the precision requirement of machining equipment is reduced, and the problems can be solved.
The invention is realized by the following technical scheme: the utility model provides an expansion valve core, includes valve body, inflation cover, sealing washer, gland and first check valve, valve body one end is equipped with chamber and the runner that holds that has mutual intercommunication in first water conservancy diversion hole and the valve body along its axial, the inflation cover cup joints and passes through the runner and hold the chamber intercommunication in valve body periphery and inflation cover inner wall, the sealing washer sets up between inflation cover and valve body, the gland is installed and is equipped with the second water conservancy diversion hole that corresponds with first water conservancy diversion hole on the one end of keeping away from first water conservancy diversion hole and the gland at the valve body, first check valve sets up and holds the intracavity and be connected with first water conservancy diversion hole and second water conservancy diversion hole respectively.
In order to facilitate the sealing performance of the expansion sleeve, the valve body is provided with an annular hydraulic cavity and an annular mounting groove which are mutually communicated, the annular mounting groove is arranged in the valve body and sleeved outside the accommodating cavity, the inner wall of the annular hydraulic cavity is communicated with the accommodating cavity through a flow channel, and the annular mounting groove is arranged on the outer peripheral surface of the valve body and used for mounting the expansion sleeve.
The sealing performance of the expansion sleeve is further enhanced, and the length of the annular hydraulic cavity in the axial direction of the valve body is smaller than that of the annular mounting groove in the axial direction of the valve body.
In order to facilitate blocking of hydraulic oil in the annular hydraulic cavity to flow out of the valve body from the expansion sleeve, two annular sealing grooves used for installing sealing rings are arranged on the valve body, and the annular sealing grooves are respectively located on two sides of the annular hydraulic cavity.
In order to facilitate sealing, the first one-way valve comprises a first spring and first steel balls connected to two ends of the first spring.
In order to facilitate installation, one side of the gland, which is close to the valve body, is provided with a spacer bush, and the gland is connected with the valve body through the spacer bush.
A hydraulic lock with an expansion valve core comprises a valve block and the expansion valve core, wherein a first inner cavity, a second inner cavity and a third inner cavity which are sequentially arranged along the axial direction of the valve block and are communicated with each other are arranged in the valve block, a third flow guide hole and a fourth flow guide hole are respectively arranged in the first inner cavity and the third inner cavity, a second one-way valve used for controlling the third flow guide hole is arranged in the first inner cavity, a third one-way valve used for controlling the fourth flow guide hole is arranged in the second inner cavity, the expansion valve core is arranged in the third inner cavity, side walls of two ends of the third inner cavity are respectively provided with a fifth flow guide hole and a sixth flow guide hole, and the fifth flow guide hole and the sixth flow guide hole are respectively positioned on two sides of the expansion valve core.
In order to facilitate self-locking and sealing, the third diversion hole is communicated with a rod cavity of the hydraulic cylinder, and the fourth diversion hole is communicated with a rodless cavity of the hydraulic cylinder.
A hydraulic valve sealing method adopting an expansion valve core comprises the following steps: firstly, an expansion valve core is placed in a valve block, when oil pressure exists on the left side of the expansion valve core, a first one-way valve is opened, and hydraulic oil flows in from a first flow guide hole; and secondly, after the first steel ball moves to the flow channel, the hydraulic oil in the accommodating cavity enters the annular hydraulic cavity from the flow channel, the sealing ring blocks the hydraulic oil in the annular hydraulic cavity from flowing out of the expansion valve core from the expansion sleeve, and simultaneously, under the action of pressure, the expansion sleeve expands to seal the valve block, and the right check valve blocks the hydraulic oil in the accommodating cavity from entering the second flow guide hole.
The beneficial effects of the invention are as follows:
the fit clearance is influenced by oil pressure, the larger the oil pressure is, the larger the expansion amount of the expansion sleeve is, the smaller the clearance between valve holes of the expansion valve core is, the acceleration of the leakage amount of the expansion valve core is slowed down or reversely increased, namely, the larger the pressure is, the smaller the leakage is, and the result is related to the wall thickness of a sleeve of the expansion sleeve;
the length of the expansion valve core can be shortened by the same leakage amount, the installation space is saved, the machining error is reduced, and the precision requirement of machining equipment is lowered.
Drawings
FIG. 1 is a schematic structural view of an expansion valve core;
FIG. 2 is a schematic diagram of a hydraulic lock configuration with an expansion valve spool;
FIG. 3 is a diagram showing the state of the hydraulic lock structure with an expansion valve core in cooperation with an oil cylinder;
in the figure: 1. a valve body; 11. a first flow guide hole; 12. an accommodating chamber; 13. a flow channel; 14. an annular hydraulic chamber; 15. an annular mounting groove; 16. an annular seal groove; 2. an expansion sleeve; 3. a seal ring; 4. a gland; 41. 15 holes of the second guide flow; 42. a spacer sleeve; 5. a first check valve; 51. a first spring; 52. a first steel ball; 6. a valve block; 61. a first lumen; 62. a second lumen; 63. a third lumen; 64. a third flow guide hole; 65. a fourth diversion hole; 66. a second one-way valve; 67. a fifth flow guide hole; 68. a sixth flow guide hole; 69. a third check valve; 7. a hydraulic cylinder; 71. a rod cavity; 72. a rodless cavity.
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. 1-3, an expansion valve core comprises a valve body 1, an expansion sleeve 2, a sealing ring 3, a gland 4 and a first check valve 5, wherein one end of the valve body 1 is provided with a first flow guide hole 1511 along the axial direction thereof, the valve body 1 is internally provided with an accommodating cavity 12 and a flow channel 13 which are communicated with each other, the expansion sleeve 2 is sleeved on the periphery of the valve body 1, the inner wall of the expansion sleeve 2 is communicated with the accommodating cavity 12 through the flow channel 13, the sealing ring 3 is arranged between the expansion sleeve 2 and the valve body 1, the gland 4 is arranged at one end of the valve body 1 far away from the first flow guide hole 1511, the gland 4 is provided with a second flow guide 41 hole 15 corresponding to the first flow guide hole 1511, the first check valve 5 is arranged in the accommodating cavity 12 and respectively connected with the first flow guide hole 1511 and the second flow guide 41 hole 15, the valve body 1 is provided with an annular hydraulic cavity 14 and an annular mounting groove 15 which are communicated with each other, the annular mounting, annular hydraulic chamber 14 inner wall passes through runner 13 and holds chamber 12 intercommunication, annular mounting groove 15 sets up on 1 outer peripheral face of valve body and is used for installing inflation cover 2, annular hydraulic chamber 14 is less than annular mounting groove 15 along 1 axial length of its valve body along the axial length of its valve body, be equipped with two annular seal groove 16 and the annular seal groove 16 that are used for installing sealing washer 3 on valve body 1 and be located the both sides of annular hydraulic chamber 14 respectively, first check valve 5 includes first spring 51 and connects the first steel ball 52 at first spring 51 both ends, one side that gland 4 is close to valve body 1 is equipped with spacer 42, gland 4 passes through spacer 42 and is connected with valve body 1.
A hydraulic lock with an expansion valve core comprises a valve block 6 and the expansion valve core, wherein a first inner cavity 61, a second inner cavity 62 and a third inner cavity 63 which are sequentially arranged along the axial direction of the valve block 6 and are mutually communicated are arranged in the valve block 6, the first inner cavity 61 and the third inner cavity 63 are respectively provided with a third diversion hole 6415 and a fourth diversion hole 6515, the first inner cavity 61 is internally provided with a second one-way valve 66 for controlling the third diversion hole 6415, the second inner cavity 62 is internally provided with a third one-way valve 69 for controlling the fourth diversion hole 6515, the expansion valve core is arranged in the third inner cavity 63, the side walls of the two ends of the third inner cavity 63 are respectively provided with a fifth guiding hole 6715 and a sixth guiding hole 6815, the fifth and sixth pilot holes 6715 and 6815 are respectively located at both sides of the expansion valve spool, in order to facilitate self-locking and sealing, the third flow guide hole 6415 is communicated with a rod cavity 71 of the hydraulic cylinder 7, and the fourth flow guide hole 6515 is communicated with a rodless cavity 72 of the hydraulic cylinder 7.
A hydraulic valve sealing method adopting an expansion valve core comprises the following steps: firstly, an expansion valve core is placed in a valve block 6, when oil pressure exists on the left side of the expansion valve core, a first one-way valve 5 is opened, and hydraulic oil flows in from a first flow guide hole 1511; and secondly, after the first steel ball 52 moves to the flow channel 13, the hydraulic oil in the accommodating cavity 12 enters the annular hydraulic cavity 14 from the flow channel 13, the sealing ring 3 prevents the hydraulic oil in the annular hydraulic cavity 14 from flowing out of the expansion valve core from the expansion sleeve 2, meanwhile, under the action of pressure, the expansion sleeve 2 expands to seal the valve block 6, and the right one-way valve seals the hydraulic oil in the accommodating cavity 12 and prevents the hydraulic oil from entering the second flow guide 41 hole 15.
The rod cavity 71 of the hydraulic cylinder 7 is connected with the port A, the rodless cavity 72 is connected with the port B, when oil pressure enters from the port P, the second check valve 66 on the left side is pushed open to enter the rod cavity 71 of the oil cylinder, meanwhile, the oil pressure pushes the expansion valve core to the right side, the third check valve 69 on the right side is pushed open, oil in the rodless cavity 72 can flow back to an oil tank from a right oil way, in order to avoid the situation that the oil pressure reaches the right side from the left side of the valve hole 15 through a gap, a sufficient length L and a gap Ss as small as possible are needed, the traditional expansion valve cores L and Ss are constant, and leakage amount is caused by factors such as machining errors and motion abrasion and the like.
It should be noted that the theoretical calculation of the flow rate is referred to the form in the following table, and ideally, the concentric circular seam is used, but in actual conditions, the valve core does not operate vertically, and the maximum eccentric circular seam is used as most of the conditions: maximum eccentric ring gapThe invention is explained in principle in an ideal state, namely concentric circular seams: concentric ring gap flow
After applying the expansion valve core, the oil pressure P will push the first left side in the expansion valve coreThe one-way valve 5 expands the expansion sleeve 2 on the expansion valve core, so that the Ss is further reduced, namely the Ss is changed along with the pressure change. The leakage equation of the expansion valve core is as follows: leakage amount
The discharge rate is in direct proportion to the pressure, the diameter of the expansion valve core and the clearance, and is in inverse proportion to the length and the viscosity coefficient;
the diameter variation of the expansion sleeve 2 after being pressed is as follows: change in expanded diameter
The diameter variation of the expansion sleeve 2 is in direct proportion to the pressure;
since the left side pressure of the expansion valve core is P and the right side pressure is 0 (oil tank), the pressure outside the right side of the expansion valve core is reduced along with the increase of the length L, and the pressure inside the expansion sleeve 2 is always P, so that the expansion amount of the right side of the expansion sleeve 2 is increased along with the increase of the differential pressure, the smaller the gap between the outer side and the valve hole 15 is, and the more obvious the throttling effect is.
The thickness of the expansion sleeve 2 needs to meet the wall thickness checking calculation:
delta is the wall thickness, D is the inner diameter of the expansion sleeve 2, and Pmax is the maximum pressure;
the requirement is simultaneously satisfied that the expansion sleeve 2 does not generate plastic deformation under the maximum impact pressure:
pn is the service pressure, Ppl is the plastic deformation pressure, D1 is the outer diameter of the expansion sleeve 2, and D is the inner diameter of the expansion sleeve 2;
through the formula, the expansion valve core with the structure can be compared, under the condition of the same length and the same initial gap Ss, the internal leakage generated on the expansion valve core is effectively reduced along with the increase of the pressure, the performance of improving the sealing (throttling) is increased along with the increase of the pressure, and under the condition of certain fit clearance, the minimum length of the valve core only needs to ensure the leakage standard at the lowest working pressure (along with the increase of the pressure, the clearance is reduced by the expansion sleeve 2 to meet the requirement of the leakage standard);
this patent specification exemplifies a shuttle valve cartridge and is not limited to shuttle valve cartridges. The principle is as follows: an expandable structure is utilized to reduce the flow gap of the fluid to achieve a restriction or seal.
Compared with the prior art, the fit clearance is influenced by oil pressure, the larger the oil pressure is, the larger the expansion amount of the expansion sleeve 2 is, the smaller the clearance between the valve holes 15 of the expansion valve core is, the slower the acceleration or the reverse increase of the leakage amount is, namely, the larger the pressure is, the smaller the leakage is, and the result is related to the sleeve wall thickness of the expansion sleeve 2; the length of the expansion valve core can be shortened by the same leakage amount, the installation space is saved, the machining error is reduced, and the precision requirement of machining equipment is lowered.
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 (9)
1. An expansion valve core, characterized in that: including valve body, inflation cover, sealing washer, gland and first check valve, valve body one end is equipped with chamber and the runner that holds that has mutual intercommunication in first water conservancy diversion hole and the valve body along its axial, the inflation cover cup joints at valve body periphery and inflation cover inner wall through the runner and holds the chamber intercommunication, the sealing washer sets up between inflation cover and valve body, the gland is installed and is equipped with the second water conservancy diversion hole that corresponds with first water conservancy diversion hole on the one end of keeping away from first water conservancy diversion hole at the valve body and the gland, first check valve sets up and holds the intracavity and respectively with first water conservancy diversion hole and second water conservancy diversion jogged joint.
2. The expansion valve cartridge of claim 1, wherein: the valve body has cyclic annular hydraulic pressure chamber and the cyclic annular mounting groove that link up each other, cyclic annular mounting groove sets up in the valve body and the cover is located and is held outside the chamber, cyclic annular hydraulic pressure intracavity wall through the runner with hold the chamber intercommunication, cyclic annular mounting groove sets up on the valve body outer peripheral face and is used for installing the inflation cover.
3. The expansion valve cartridge of claim 2, wherein: the length of the annular hydraulic cavity along the axial direction of the valve body is smaller than that of the annular mounting groove along the axial direction of the valve body.
4. The expansion valve cartridge of claim 3, wherein: the valve body is provided with two annular seal grooves for mounting the seal ring, and the annular seal grooves are respectively positioned on two sides of the annular hydraulic cavity.
5. The expansion valve cartridge of claim 1, wherein: the first one-way valve comprises a first spring and first steel balls connected to two ends of the first spring.
6. The expansion valve cartridge of claim 1, wherein: and a spacer bush is arranged on one side of the gland close to the valve body, and the gland is connected with the valve body through the spacer bush.
7. A hydraulic lock having an expansion spool according to any one of claims 1 to 6, wherein: the expansion valve comprises a valve block and an expansion valve core, wherein a first inner cavity, a second inner cavity and a third inner cavity which are sequentially arranged along the axial direction of the valve block and are mutually communicated are arranged in the valve block, a third flow guide hole and a fourth flow guide hole are respectively arranged in the first inner cavity and the third inner cavity, a second one-way valve used for controlling the third flow guide hole is arranged in the first inner cavity, a third one-way valve used for controlling the fourth flow guide hole is arranged in the second inner cavity, the expansion valve core is arranged in the third inner cavity, the side walls of the two ends of the third inner cavity are respectively provided with a fifth flow guide hole and a sixth flow guide hole, and the fifth flow guide hole and the sixth flow guide hole are respectively positioned on the two sides of the.
8. The hydraulic lock structure with an expansion spool according to claim 7, wherein: the third flow guide hole is communicated with a rod cavity of the hydraulic cylinder, and the fourth flow guide hole is communicated with a rodless cavity of the hydraulic cylinder.
9. A method of sealing a hydraulic valve using an expansion spool as claimed in any one of claims 1 to 6, characterized by: the method comprises the following steps: firstly, an expansion valve core is placed in a valve block, when oil pressure exists on the left side of the expansion valve core, a first one-way valve is opened, and hydraulic oil flows in from a first flow guide hole; and secondly, after the first steel ball moves to the flow channel, the hydraulic oil in the accommodating cavity enters the annular hydraulic cavity from the flow channel, the sealing ring blocks the hydraulic oil in the annular hydraulic cavity from flowing out of the expansion valve core from the expansion sleeve, and simultaneously, under the action of pressure, the expansion sleeve expands to seal the valve block, and the right check valve blocks the hydraulic oil in the accommodating cavity from entering the second flow guide hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634257.5A CN110594218A (en) | 2019-07-15 | 2019-07-15 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634257.5A CN110594218A (en) | 2019-07-15 | 2019-07-15 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
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| Publication Number | Publication Date |
|---|---|
| CN110594218A true CN110594218A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910634257.5A Pending CN110594218A (en) | 2019-07-15 | 2019-07-15 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
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| Country | Link |
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| CN (1) | CN110594218A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503046A (en) * | 2020-12-07 | 2021-03-16 | 连云港师范高等专科学校 | Hydraulic valve with self-adaptive adjusting actuator |
-
2019
- 2019-07-15 CN CN201910634257.5A patent/CN110594218A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503046A (en) * | 2020-12-07 | 2021-03-16 | 连云港师范高等专科学校 | Hydraulic valve with self-adaptive adjusting actuator |
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