CN110552924A - Hydraulic operating mechanism, control valve and main valve of control valve - Google Patents
Hydraulic operating mechanism, control valve and main valve of control valve Download PDFInfo
- Publication number
- CN110552924A CN110552924A CN201810565783.6A CN201810565783A CN110552924A CN 110552924 A CN110552924 A CN 110552924A CN 201810565783 A CN201810565783 A CN 201810565783A CN 110552924 A CN110552924 A CN 110552924A
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- Prior art keywords
- main valve
- operating rod
- valve
- hole
- main
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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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
- 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
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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
- F16K27/04—Construction of housing; Use of materials therefor of sliding 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
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention relates to a hydraulic operating mechanism, a control valve and a main valve of the control valve, wherein the control valve comprises a main valve and a two-stage valve arranged on the main valve, the main valve comprises a main valve body and a main valve spool arranged in the main valve body in a sliding way, and an operating rod through hole for an operating rod to pass through to drive the main valve spool to move is arranged at the position of the main valve body corresponding to the end part of the main valve spool; the main valve also comprises a plugging piece for plugging the operating rod through hole. If the operation is improper, the valve core of the main valve is not moved in place, and the two valve ports of the main valve are not sealed, the sealing piece is detached, the operating rod through hole is opened, the operating rod is inserted into the main valve, the valve core of the main valve is driven by the operating rod to act, the valve port of the main valve on one side is sealed, and the system stores energy again. Therefore, when the control valve is maintained, the control valve does not need to be detached from the mechanism, the work of oil drainage, oil injection, wire connection, cleaning and the like is avoided, and the working efficiency is greatly improved.
Description
Technical Field
The invention relates to a control valve with manual operation function, a main valve of the control valve and a hydraulic operating mechanism using the control valve.
background
The electromagnetic control valve is a core component of the hydraulic operating mechanism and is used for converting an electric signal of a switching-off command or a switching-on command sent by the control room into a hydraulic signal and amplifying the hydraulic signal, controlling the operating mechanism to perform switching-off, switching-on and automatic reclosing actions and driving the breaker body to realize switching-off, switching-on and automatic reclosing operations. The present electromagnetic control valve for hydraulic actuators is mainly a two-position three-way control valve, such as the hydraulic control valve disclosed in the chinese patent application with publication No. CN106783422A and publication No. 2017.05.31.
The control valve comprises a main valve and a two-stage valve arranged on the main valve, the structure of the main valve comprises a main valve body and a main valve spool 3 arranged in the main valve body, the main valve body comprises an outer sleeve 4, a main valve sleeve I2 and a main valve sleeve II 5 which are arranged in the outer sleeve 4, an end cover I1 and an end cover II 6 are arranged at two ends of the outer sleeve 4 and used for fixing and limiting the main valve sleeve I2 and the main valve sleeve II 5, the main valve spool 3 is arranged in the main valve sleeve I2 and the main valve sleeve II 5 and forms a main valve port I9 and a main valve port II 10 with the two main valve sleeves respectively, and the opening or closing of the main valve port I9 and the main valve port II 10 and the opening or closing of the mechanism are controlled by the left and right movement of the main valve spool 3 through oil pressure control.
The existing control valve mainly has the following problems: the control valve does not have the function of manually operating the main valve spool 3, and once the operation is wrong and the main valve spool 3 does not move in place, the valve port I9 and the valve port II 10 of the main valve are both in an open state, so that the high-pressure oil chamber P and the low-pressure oil chamber T of the hydraulic mechanism are communicated, and the hydraulic system cannot store energy. Therefore, the control valve needs to be detached from the hydraulic mechanism for maintenance, and the hydraulic control system is large in workload, high in labor intensity and low in efficiency.
Disclosure of Invention
The invention aims to provide a control valve with a manual operation function, which is used for solving the problem that the valve core of the existing control valve cannot be manually operated; the invention also aims to provide a hydraulic operating mechanism using the control valve and a main valve of the control valve.
In order to achieve the above object, the control valve of the present invention according to claim 1 is: the control valve comprises a main valve and a secondary valve arranged on the main valve, the main valve comprises a main valve body and a main valve spool slidably arranged in the main valve body, and an operating rod through hole for an operating rod to pass through to drive the main valve spool to move is formed in the position, corresponding to the end part of the main valve spool, of the main valve body; the main valve also comprises a plugging piece for plugging the operating rod through hole.
The beneficial effects are that: if the operation is improper, the valve core of the main valve is not moved in place, and the two valve ports of the main valve are not sealed, the sealing piece is detached, the operating rod through hole is opened, the operating rod is inserted into the main valve, the valve core of the main valve is driven by the operating rod to act, the valve port of the main valve on one side is sealed, and the system stores energy again. Therefore, when the control valve is maintained, the control valve does not need to be detached from the mechanism, the work of oil drainage, oil injection, wire connection, cleaning and the like is avoided, and the working efficiency is greatly improved.
Scheme 2 is: on the basis of the scheme 1, the main valve further comprises an operating rod for driving the valve core of the main valve to act, the operating rod is arranged in the operating rod through hole in a penetrating mode, and a sliding sealing piece is arranged in the operating rod through hole. The operating rod is arranged on the main valve, and the operation is convenient.
Scheme 3 is: on the basis of the scheme 2, one end of the operating rod, which is used for driving the main valve spool, is a T-shaped end, and the large-diameter part of the T-shaped end is used for being matched with the edge of the orifice of the operating rod through hole in a blocking manner. The operating rod is connected with the main valve body, and the loss of the operating rod is avoided.
Scheme 4 is: on the basis of the scheme 3, a sinking groove for sinking the large-diameter part of the T-shaped end is formed in the valve body of the main valve. The motion of the valve core of the main valve is prevented from being influenced by the operating rod.
Scheme 5: on the basis of the scheme 4, the main valve body comprises a main valve sleeve and an end cover used for positioning the main valve sleeve, and the operating rod through hole is formed by a through hole penetrating through the main valve sleeve and the end cover.
Scheme 6 is: on the basis of any one of the schemes 1 to 5, the operating rod through hole is formed in the side wall, perpendicular to the main valve spool, of the main valve body and close to the low-pressure oil cavity in the main valve body.
The main valve of the control valve of the present invention according to claim 1 is: the main valve comprises a main valve body and a main valve spool which is slidably arranged in the main valve body, and an operating rod through hole for an operating rod to pass through so as to drive the main valve spool to move is formed in the position, corresponding to the end part of the main valve spool, of the main valve body; the main valve also comprises a plugging piece for plugging the operating rod through hole.
The beneficial effects are that: if the operation is improper, the valve core of the main valve is not moved in place, and the two valve ports of the main valve are not sealed, the sealing piece is detached, the operating rod through hole is opened, the operating rod is inserted into the main valve, the valve core of the main valve is driven by the operating rod to act, the valve port of the main valve on one side is sealed, and the system stores energy again. Therefore, when the control valve is maintained, the control valve does not need to be detached from the mechanism, the work of oil drainage, oil injection, wire connection, cleaning and the like is avoided, and the working efficiency is greatly improved.
Scheme 2 is: on the basis of the scheme 1, the main valve further comprises an operating rod for driving the valve core of the main valve to act, the operating rod is arranged in the operating rod through hole in a penetrating mode, and a sliding sealing piece is arranged in the operating rod through hole. The operating rod is arranged on the main valve, and the operation is convenient.
Scheme 3: on the basis of the scheme 2, one end of the operating rod, which is used for driving the main valve spool, is a T-shaped end, and the large-diameter part of the T-shaped end is used for being matched with the edge of the orifice of the operating rod through hole in a blocking manner. The operating rod is connected with the main valve body, and the loss of the operating rod is avoided.
Scheme 4 is: on the basis of the scheme 3, a sinking groove for sinking the large-diameter part of the T-shaped end is formed in the valve body of the main valve. The motion of the valve core of the main valve is prevented from being influenced by the operating rod.
Scheme 5 is: on the basis of 4, the main valve body comprises a main valve sleeve and an end cover used for positioning the main valve sleeve, and the operating rod through hole is formed by a through hole penetrating through the main valve sleeve and the end cover.
Scheme 6 is: on the basis of any one of the schemes 1 to 5, the operating rod through hole is formed in the side wall, perpendicular to the main valve spool, of the main valve body and close to the low-pressure oil cavity in the main valve body.
The scheme 1 of the hydraulic operating mechanism of the invention is as follows: the hydraulic operating mechanism comprises a driving cylinder for driving a breaker fracture to act and a control valve for connecting with the driving cylinder, the control valve comprises a main valve and a secondary valve arranged on the main valve, the main valve comprises a main valve body and a main valve core arranged in the main valve body in a sliding manner, and an operating rod through hole for an operating rod to pass through so as to drive the main valve core to move is arranged on the position, corresponding to the end part of the main valve core, of the main valve body; the main valve also comprises a plugging piece for plugging the operating rod through hole.
The beneficial effects are that: if the operation is improper, the valve core of the main valve is not moved in place, and the two valve ports of the main valve are not sealed, the sealing piece is detached, the operating rod through hole is opened, the operating rod is inserted into the main valve, the valve core of the main valve is driven by the operating rod to act, the valve port of the main valve on one side is sealed, and the system stores energy again. Therefore, when the control valve is maintained, the control valve does not need to be detached from the mechanism, the work of oil drainage, oil injection, wire connection, cleaning and the like is avoided, and the working efficiency is greatly improved.
Scheme 2 is: on the basis of the scheme 1, the main valve further comprises an operating rod for driving the valve core of the main valve to act, the operating rod is arranged in the operating rod through hole in a penetrating mode, and a sliding sealing piece is arranged in the operating rod through hole. The operating rod is arranged on the main valve, and the operation is convenient.
Scheme 3: on the basis of the scheme 2, one end of the operating rod, which is used for driving the main valve spool, is a T-shaped end, and the large-diameter part of the T-shaped end is used for being matched with the edge of the orifice of the operating rod through hole in a blocking manner. The operating rod is connected with the main valve body, and the loss of the operating rod is avoided.
Scheme 4 is: on the basis of the scheme 3, a sinking groove for sinking the large-diameter part of the T-shaped end is formed in the valve body of the main valve. The motion of the valve core of the main valve is prevented from being influenced by the operating rod.
Scheme 5 is: on the basis of the scheme 4, the main valve body comprises a main valve sleeve and an end cover used for positioning the main valve sleeve, and the operating rod through hole is formed by a through hole penetrating through the main valve sleeve and the end cover.
Scheme 6 is: on the basis of any one of the schemes 1 to 5, the operating rod through hole is formed in the side wall, perpendicular to the main valve spool, of the main valve body and close to the low-pressure oil cavity in the main valve body.
Drawings
FIG. 1 is a schematic diagram of a main valve of a conventional control valve;
FIG. 2 is a schematic diagram of a first embodiment of a main valve of the control valve of the present invention;
Fig. 3 is an enlarged view of a portion a in fig. 2.
In the figure: 1-end cover I, 2-main valve sleeve I, 3-main valve core, 4-outer sleeve, 5-main valve sleeve II, 6-end cover II, 7-operating rod, 8-sealing ring, 9-main valve port I, 10-main valve port II, P-high pressure oil cavity, T-low pressure oil cavity and Z-middle oil cavity.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the first embodiment of the main valve of the control valve for a hydraulic operating mechanism according to the present invention, as shown in fig. 2 to 3, the main valve includes a main valve body and a main valve spool 3 slidably disposed in the main valve body, and the main valve body includes an outer sleeve 4, and a main valve sleeve i 2 and a main valve sleeve ii 5 mounted in the outer sleeve 4. End cover I1 and end cover II 6 set up the left and right ends of the jacket body 4, are used for fixing and spacing main valve barrel I2, main valve barrel II 5 respectively. The main valve spool 3 is installed in the main valve housing i 2 and the main valve housing ii 5, the main valve spool 3, the main valve housing i 2 and the main valve housing ii 5 form a main valve port i 9 and a main valve port ii 10, respectively, and the opening and closing of the main valve port i 9 and the main valve port ii 10 are controlled by controlling the left and right movements of the main valve spool 3 through oil pressure, thereby controlling the opening and closing operations of the mechanism.
An operating rod through hole penetrating through the main valve sleeve II 5 and the end cover II 6 is formed in the end face, facing the right end of the main valve spool 3, of the main valve sleeve II 5, the center line of the operating rod through hole is collinear with the axis of the main valve spool 3, the operating rod 7 is arranged in the operating rod through hole in a penetrating mode, a sealing ring 8 used for forming sliding sealing fit with the operating rod 7 when the operating rod 7 moves is arranged in the operating rod through hole, one end of the operating rod 7 is used for pushing the main valve spool 3, and the other end of the operating rod 7 extends out of the.
one end of the operating rod 7 used for pushing the main valve core 3 is a T-shaped end, the T-shaped end is provided with a large-diameter part with a larger diameter used for pushing the main valve core 3, and the large-diameter part is matched with the edge of an orifice of the operating rod through hole in a stop manner; the end face, facing the main valve spool 3, of the main valve sleeve II 5 is provided with a groove for sinking the large-diameter part of the T-shaped end, so that the main valve spool 3 is prevented from being influenced by the operating rod 7.
If the operation is improper, the main valve spool 3 will not move in place, and both the main valve port I9 and the main valve port II 10 are not sealed, the operating lever 7 can be manually pushed to move the main valve spool 3 to the left, so as to seal the main valve port I9. After the system stores energy again, the operating rod 7 is reset under the action of oil pressure. When the control valve is maintained, the control valve does not need to be detached from the mechanism, the work of oil drainage, oil injection, wire connection, cleaning and the like is avoided, and the working efficiency is greatly improved.
The second embodiment is different from the first embodiment in that: the main valve of the control valve does not comprise an operating rod, and the operating rod is additionally arranged; when the control valve works, a plugging piece, such as a screw plug, is used for plugging the through hole of the operating rod on the valve body of the main valve; when the plugging piece needs to be overhauled, the plugging piece is taken down firstly, and the operation rod is conveyed into the operation rod through hole for operation.
The third embodiment is different from the first embodiment in that: one end of the operating part is in threaded connection with the main valve core through a threaded structure; when the main valve core does not move in place, the main valve core is driven to act by pushing or pulling the operating rod.
The fourth embodiment is different from the first embodiment in that: and a spring for applying a reset force to the operating rod is arranged between the operating rod and the main valve body, and after manual operation is completed, the operating rod automatically resets under the action of the spring force.
The fifth embodiment is different from the first embodiment in that: the axis of the operating rod is parallel to the axis of the main valve spool and is arranged in a radially staggered mode, and the end portion of the operating rod is radially staggered with the center hole in the end portion of the main valve spool.
In other embodiments, the main valve body may also be a valve body of an integrated structure; in addition, the operating rod through holes can be arranged on the end cover I and the main valve sleeve I.
In an embodiment of the control valve according to the present invention, the control valve includes a main valve and a secondary valve provided on the main valve, and the structure of the main valve is the same as that of any one of the embodiments of the main valve of the control valve according to the present invention described above; therefore, the description will not be repeated.
In the embodiment of the hydraulic operating mechanism, the hydraulic operating mechanism comprises a driving cylinder for driving the breaker to break and a control valve for connecting with the driving cylinder, the control valve comprises a main valve and a secondary valve arranged on the main valve, and the structure of the main valve is the same as that of any embodiment of the main valve of the control valve; therefore, the description will not be repeated.
Claims (8)
1. A control valve used on a hydraulic operating mechanism comprises a main valve and a secondary valve arranged on the main valve, wherein the main valve comprises a main valve body and a main valve spool arranged in the main valve body in a sliding way, and the control valve is characterized in that: an operating rod through hole for an operating rod to penetrate through to drive the main valve spool to move is formed in the position, corresponding to the end part of the main valve spool, of the main valve body; the main valve also comprises a plugging piece for plugging the operating rod through hole.
2. The control valve of claim 1, wherein: the main valve also comprises an operating rod used for driving the valve core of the main valve to act, the operating rod is arranged in the operating rod through hole in a penetrating mode, and a sliding sealing piece is arranged in the operating rod through hole.
3. The control valve of claim 2, wherein: one end of the operating rod, which is used for driving the main valve core, is a T-shaped end, and the large-diameter part of the T-shaped end is used for being matched with the edge of the orifice of the operating rod through hole in a blocking mode.
4. The control valve of claim 3, wherein: and the main valve body is provided with a sinking groove for sinking the large-diameter part of the T-shaped end.
5. The control valve of claim 4, wherein: the main valve body includes a main valve housing and an end cap for positioning the main valve housing, and the operating rod through-hole is formed by a through-hole penetrating the main valve housing and the end cap.
6. The control valve according to any one of claims 1 to 5, characterized in that: the operating rod through hole is formed in the side wall, perpendicular to the main valve spool and close to the low-pressure oil cavity in the main valve body, of the main valve body.
7. The main valve of the control valve for the hydraulic operating mechanism comprises a main valve body and a main valve core which is arranged in the main valve body in a sliding way, and is characterized in that: an operating rod through hole for an operating rod to penetrate through to drive the main valve spool to move is formed in the position, corresponding to the end part of the main valve spool, of the main valve body; the main valve also comprises a plugging piece for plugging the operating rod through hole.
8. The hydraulic operating mechanism comprises a driving cylinder for driving a breaker fracture to act and a control valve connected with the driving cylinder, wherein the control valve comprises a main valve and a secondary valve arranged on the main valve, the main valve comprises a main valve body and a main valve core arranged in the main valve body in a sliding manner, and the hydraulic operating mechanism is characterized in that: an operating rod through hole for an operating rod to penetrate through to drive the main valve spool to move is formed in the position, corresponding to the end part of the main valve spool, of the main valve body; the main valve also comprises a plugging piece for plugging the operating rod through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565783.6A CN110552924B (en) | 2018-06-04 | 2018-06-04 | Hydraulic operating mechanism, control valve and main valve of control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565783.6A CN110552924B (en) | 2018-06-04 | 2018-06-04 | Hydraulic operating mechanism, control valve and main valve of control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110552924A true CN110552924A (en) | 2019-12-10 |
| CN110552924B CN110552924B (en) | 2021-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810565783.6A Active CN110552924B (en) | 2018-06-04 | 2018-06-04 | Hydraulic operating mechanism, control valve and main valve of control valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN110552924B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112289599A (en) * | 2020-10-26 | 2021-01-29 | 国网上海市电力公司 | Control valve, hydraulic operating mechanism and circuit breaker |
| CN112392789A (en) * | 2020-10-26 | 2021-02-23 | 平高集团有限公司 | Hydraulic control valve, hydraulic operating mechanism using same and circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201354779Y (en) * | 2009-02-26 | 2009-12-02 | 南京工业职业技术学院 | Hydraulic balanced valve |
| CN204344559U (en) * | 2014-11-18 | 2015-05-20 | 宁波长壁流体动力科技有限公司 | A kind of changeover valve core |
| CN106783422A (en) * | 2016-12-27 | 2017-05-31 | 河南平高电气股份有限公司 | Hydraulic control valve and hydraulic actuating mechanism, breaker |
| CN108105191A (en) * | 2017-12-13 | 2018-06-01 | 北京天地玛珂电液控制系统有限公司 | Change-over valve core and manual-automatic integral reversal valve |
-
2018
- 2018-06-04 CN CN201810565783.6A patent/CN110552924B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201354779Y (en) * | 2009-02-26 | 2009-12-02 | 南京工业职业技术学院 | Hydraulic balanced valve |
| CN204344559U (en) * | 2014-11-18 | 2015-05-20 | 宁波长壁流体动力科技有限公司 | A kind of changeover valve core |
| CN106783422A (en) * | 2016-12-27 | 2017-05-31 | 河南平高电气股份有限公司 | Hydraulic control valve and hydraulic actuating mechanism, breaker |
| CN108105191A (en) * | 2017-12-13 | 2018-06-01 | 北京天地玛珂电液控制系统有限公司 | Change-over valve core and manual-automatic integral reversal valve |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112289599A (en) * | 2020-10-26 | 2021-01-29 | 国网上海市电力公司 | Control valve, hydraulic operating mechanism and circuit breaker |
| CN112392789A (en) * | 2020-10-26 | 2021-02-23 | 平高集团有限公司 | Hydraulic control valve, hydraulic operating mechanism using same and circuit breaker |
| CN112392789B (en) * | 2020-10-26 | 2022-01-28 | 平高集团有限公司 | Hydraulic control valve, hydraulic operating mechanism using same and circuit breaker |
| CN112289599B (en) * | 2020-10-26 | 2023-11-10 | 国网上海市电力公司 | Control valve, hydraulic operating mechanism and circuit breaker |
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| CN110552924B (en) | 2021-07-02 |
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