CN111895162A - Flat gate valve for oil field - Google Patents
Flat gate valve for oil field Download PDFInfo
- Publication number
- CN111895162A CN111895162A CN202010815153.7A CN202010815153A CN111895162A CN 111895162 A CN111895162 A CN 111895162A CN 202010815153 A CN202010815153 A CN 202010815153A CN 111895162 A CN111895162 A CN 111895162A
- Authority
- CN
- China
- Prior art keywords
- block
- valve
- square block
- rod
- switching
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 230000000149 penetrating Effects 0.000 claims abstract description 4
- 230000000875 corresponding Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
Classifications
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/14—Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves
- F16K31/143—Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves the fluid acting on a piston
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0254—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor being operated by particular means
Abstract
The invention discloses a flat gate valve for an oil field, which comprises a valve body, a gate plate, a valve rod and a valve cover, and is characterized in that: the upper end of the valve cover is provided with a support, the upper end of the support is provided with a cylinder body, a piston is arranged in the cylinder body, and the piston is in transmission connection with the valve rod through a connecting rod; the control block and the switching block are arranged in the control sleeve in a vertically distributed mode, the upper end of the control sleeve is connected to the cylinder body in a rotating mode, the lower end of the switching block is connected to the support in a rotating mode, the control block and the control sleeve are in circumferential linkage, the control block comprises a left square block and a right square block which are symmetrically distributed, the left square block and the right square block can move radially and are arranged in the control sleeve, the inner sides of the left square block and the right square block are in threaded transmission fit with the valve rod, and the left square block and the right square block are driven by the switching block; the support is rotatably provided with a cross rod in a penetrating manner, the outer end of the cross rod is connected with a hand wheel, and the inner end of the cross rod is connected with the control sleeve through a bevel gear in a transmission manner. The invention realizes that the driving mode can be switched for use.
Description
Technical Field
The invention relates to an improved invention of a gate valve, in particular to an improved invention of a flat gate valve for an oil field.
Background
The drive device of traditional plate gate valve has pneumatic drive, drive that surges, electric drive or hand wheel drive, and it can only select a drive mode, can't satisfy complicated changeable service environment, if under the power failure condition, pneumatic drive etc. will be unable to use, and perhaps when single drive mode damaged, will lead to plate gate valve unable to use, influence work.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the flat gate valve for the oil field, which can be switched and used in a driving mode.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme: this kind of plate valve is used in oil field, including valve body, flashboard, valve rod and valve gap, the valve gap sets up in the valve body upper end, the valve rod liftable seals to wear to locate on the valve gap, the flashboard sets up in the valve body and links mutually with the valve rod, and the seal receptacle in flashboard and the valve body cooperatees its characterized in that: the upper end of the valve cover is provided with a support, the upper end of the support is provided with a cylinder body, a piston is arranged in the cylinder body, the piston is in transmission connection with the valve rod through a connecting rod, the cylinder body is provided with an upper air inlet hole and a lower air inlet hole which are distributed on the upper side and the lower side of the piston, and the upper air inlet hole and the lower air inlet hole are respectively connected with; the control block and the switching block are arranged in the control sleeve in a vertically distributed mode, the upper end of the control sleeve is connected to the cylinder body in a rotating mode, the lower end of the switching block is connected to the support in a rotating mode, the control block and the control sleeve are in circumferential linkage, the control block comprises a left square block and a right square block which are symmetrically distributed, the left square block and the right square block can move radially and are arranged in the control sleeve, the inner sides of the left square block and the right square block are in threaded transmission fit with the valve rod, the switching block is provided with a guide groove, the corresponding left square block and the right square block are provided with a guide rod, the guide rod and the guide groove are matched with each other to drive the left square block and the right square block to move radially, the switching block is connected with a switching handle which is arranged radially, the corresponding control sleeve is provided with a switching groove for the switching handle to rotate; the support is rotatably provided with a cross rod in a penetrating manner, the outer end of the cross rod is connected with a hand wheel, and the inner end of the cross rod is connected with the control sleeve through a bevel gear in a transmission manner.
A first boss positioned at the center is arranged at the bottom in the support, a first adjusting ring is connected to the first boss in a threaded manner, a mounting groove is formed in the lower end of the switching block, the mounting groove is rotatably sleeved at the upper end of the first adjusting ring, a first bearing is arranged between the mounting groove and the first adjusting ring, the corresponding switching block and the corresponding control block can also move up and down in the control sleeve for adjustment, and a disc spring is arranged between the upper end surface of the control block and the inner top surface of the control sleeve; the valve rod passes through the first boss and the first adjusting ring.
A second boss positioned in the center is arranged at the outer bottom of the cylinder body, a second adjusting ring is in threaded connection with the second boss, a T-shaped connecting sleeve is arranged at the upper end of the control sleeve, the second adjusting ring is sleeved at the upper end of the T-shaped connecting sleeve, a limiting flange is arranged on the inner wall of the middle part of the second adjusting ring, a second bearing is arranged between the upper end surface of the T-shaped connecting sleeve and the lower end surface of the limiting flange, a split ring and a positioning ring which are distributed up and down are arranged in the lower end of the second adjusting ring, and the split ring and the positioning ring are sleeved on the T-shaped connecting sleeve and are; the connecting rod passes through second boss, second regulation circle and adapter sleeve.
The switching handle locking structure comprises an anti-loosening sheet which can be hinged to the outer side wall of the control sleeve in an up-and-down overturning manner, and the anti-loosening sheet after being overturned downwards is in circumferential limit fit with the switching handle positioned at the starting end and the terminal end of the rotating path.
The guide groove is an arc-shaped groove, and the distance between the arc-shaped groove and the valve rod is gradually changed.
And the valve cover is provided with a grease injection nozzle communicated with the sealing assembly.
The improved flat gate valve for the oil field has the advantages that the valve has two driving modes of manual operation and pneumatic operation, one driving device can be switched at any time to drive, and the valve is opened or closed.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a cross-sectional view D-D of fig. 1 of the present invention.
Fig. 3 is a cross-sectional view E-E of fig. 1 according to the present invention.
Fig. 4 is a partially enlarged view of fig. 1 of the present invention.
Detailed Description
The drawings show the structure of the invention, and the details thereof are further described below with reference to the drawings. In the embodiment, the flat gate valve for the oil field comprises a valve body 1, a gate plate 2, a valve rod 3 and a valve cover 4, wherein the valve cover 4 is arranged at the upper end of the valve body 1, the valve rod 3 can be lifted and sealed to penetrate through the valve cover 4, a sealing component 5 is arranged between the corresponding valve rod 3 and the valve cover 4, the gate plate 2 is arranged in the valve body 1 and is linked with the valve rod 3, namely, the gate plate 2 is driven to lift by the valve rod 3, the gate plate 2 is matched with a sealing seat 6 in the valve body 1, a support 7 is arranged at the upper end of the valve cover 4, a cylinder body 8 is arranged at the upper end of the support 7, a piston 9 is arranged in the cylinder body 8, the piston 9 is in transmission connection with the valve rod 3 through a connecting rod 10, an upper air inlet hole 11 and a lower air inlet hole 12 which; a control sleeve 13, a control block 14 and a switching block 15 which are sleeved outside the valve rod 3 are arranged in the support 7, the control block 14 and the switching block 15 are vertically distributed in the control sleeve 13, the upper end of the control sleeve 13 is rotationally connected to the cylinder body 8, the lower end of the switching block 15 is rotationally connected to the support 7, the control block 14 and the control sleeve 13 are circumferentially linked, the control block 14 comprises a left block 16 and a right block 17 which are symmetrically distributed, the left block 16 and the right block 17 can be radially movably arranged in the control sleeve 13, the inner sides of the left block 16 and the right block 17 are in threaded transmission fit with the valve rod 3, semicircular notches 18 are respectively arranged at the inner sides of the left block 16 and the right block 17, a guide groove 19 is arranged on the switching block 15, a guide rod 20 is arranged on the left block 16 and the right block 17 correspondingly, and the guide rod 20 and the guide groove 19 are mutually matched to drive the left block 16 and, the switching block 15 is connected with a switching handle 21 which is arranged in the radial direction, a switching groove 22 for the switching handle 21 to rotate is arranged on the corresponding control sleeve 13, and a switching handle locking structure 23 is also arranged on the control sleeve 13; a cross rod 24 is rotatably arranged on the support 7 in a penetrating manner, the outer end of the cross rod 24 is connected with a hand wheel 25, and the inner end of the cross rod 24 is in transmission connection with the control sleeve 13 through a bevel gear 26.
As a further improved specific embodiment, a first boss 27 located at the center is arranged at the bottom in the bracket 7, a first adjusting ring 28 is connected to the first boss 27 in a threaded manner, an installation groove is arranged at the lower end of the switching block 15, the installation groove is rotatably sleeved at the upper end of the first adjusting ring 28, a first bearing 29 is arranged between the installation groove and the first adjusting ring 28, the corresponding switching block 15 and the control block 14 can also move up and down in the control sleeve 13 for adjustment, and a belleville spring 30 is arranged between the upper end surface of the control block 14 and the inner top surface of the control sleeve 13; the valve rod 3 passes through the first boss 27 and the first adjusting ring 28. During operation, the first adjusting ring 28 is rotated, and the height of the control block 14 can be adjusted by the first adjusting ring 28, so that the internal thread of the control block 14 can be accurately buckled into the external thread of the valve rod 3.
As a further improved specific embodiment, a second boss 31 located at the center is arranged at the outer bottom of the cylinder body 8, a second adjusting ring 32 is connected to the second boss 31 in a threaded manner, a T-shaped connecting sleeve 33 is arranged at the upper end of the control sleeve 13, the second adjusting ring 32 is sleeved at the upper end of the T-shaped connecting sleeve 33, a limiting flange 34 is arranged on the inner wall of the middle part of the second adjusting ring 32, a second bearing 35 is arranged between the upper end surface of the T-shaped connecting sleeve 33 and the lower end surface of the limiting flange 34, a split ring 36 and a positioning ring 37 which are distributed up and down are arranged at the lower end of the second adjusting ring 32, and the split ring 36 and the positioning ring 37 are sleeved on the T-shaped connecting sleeve 33 and are in; the connecting rod 10 passes through the second boss 31, the second adjusting ring 32 and the connecting sleeve 33. When the bevel gear adjusting mechanism works, the second adjusting ring 32 is rotated, the second adjusting ring 32 can adjust the height of the control sleeve 13, so that the control sleeve 13 can be well matched with the bevel gear 26, and bevel gear 26 transmission is formed between the bevel gear 26 and the control sleeve 13.
As a further improved specific embodiment, the switching handle locking structure 23 includes an anti-loosening piece, the anti-loosening piece can be hinged on the outer side wall of the control sleeve 13 in an up-and-down turning manner, and the anti-loosening piece after being turned down is in circumferential limit fit with the switching handle 21 located at the beginning end and the end of the rotation path, that is, the anti-loosening piece can limit the switching handle 21 at the beginning end and the end of the rotation path.
As a further improved embodiment, the guide groove 19 is an arc-shaped groove, and the distance between the arc-shaped groove and the valve rod 3 is gradually changed, so that when the switching block 15 rotates, the guide groove 19 drives the guide rod 20 to move the left block 16 and the right block 17 radially.
As a further improved embodiment, the valve cap 4 is provided with a grease injection nozzle 38 communicated with the sealing assembly 5, and sealing grease can be injected into the sealing assembly 5 through the grease injection nozzle, so that the sealing between the lower valve rod 3 and the valve cap 4 is maintained.
The working principle of the invention is that the pneumatic drive is switched to the hand wheel 25 drive: the anti-loosening piece is rotated upwards to release the rotation limitation on the switching handle 21, then the switching handle 21 is rotated anticlockwise to drive the switching block 15 to rotate anticlockwise, under the action of the guide rod 20 and the guide groove 19, the left block 16 and the right block 17 of the control block 14 respectively move inwards in the radial direction to be close to the valve rod 3 and are in threaded connection with the valve rod, when the threads are completely matched, the anticlockwise rotation of the switching handle 21 is stopped, the anti-loosening piece is put down again to limit the rotation of the switching handle 21 and the switching block 15, at the moment, the control hand wheel 25 rotates the bevel gear 26 to drive the control sleeve 13 and the control block 14 to rotate, and the valve rod 3 is driven to move upwards or downwards, so that the flash.
The hand wheel 25 drive is switched to pneumatic drive: the anti-loosening piece is rotated upwards, the switching handle 21 is rotated clockwise to drive the switching block 15 to rotate clockwise, the left block 16 and the right block 17 of the control block 14 move outwards respectively to separate from the valve rod 3 under the action of the guide rod 20 and the guide groove 19, when the control block 14 is completely separated from the valve rod 3, the switching handle 21 is stopped to rotate, the anti-loosening piece is put down again, and at the moment, the air source driving piston 9 can be used for driving the connecting rod 10 and the valve rod 3 to open or close the flashboard 2.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides an oil field is with plate valve, including valve body, flashboard, valve rod and valve gap, the valve gap sets up in the valve body upper end, the valve rod liftable is sealed to wear to locate on the valve gap, the flashboard set up in the valve body and with the valve rod linkage mutually, and the seal receptacle in flashboard and the valve body cooperatees its characterized in that: the upper end of the valve cover is provided with a support, the upper end of the support is provided with a cylinder body, a piston is arranged in the cylinder body, the piston is in transmission connection with the valve rod through a connecting rod, the cylinder body is provided with an upper air inlet hole and a lower air inlet hole which are distributed on the upper side and the lower side of the piston, and the upper air inlet hole and the lower air inlet hole are respectively connected with; the control block and the switching block are arranged in the control sleeve in a vertically distributed mode, the upper end of the control sleeve is connected to the cylinder body in a rotating mode, the lower end of the switching block is connected to the support in a rotating mode, the control block and the control sleeve are in circumferential linkage, the control block comprises a left square block and a right square block which are symmetrically distributed, the left square block and the right square block can move radially and are arranged in the control sleeve, the inner sides of the left square block and the right square block are in threaded transmission fit with the valve rod, the switching block is provided with a guide groove, the corresponding left square block and the right square block are provided with a guide rod, the guide rod and the guide groove are matched with each other to drive the left square block and the right square block to move radially, the switching block is connected with a switching handle which is arranged radially, the corresponding control sleeve is provided with a switching groove for the switching handle to rotate; the support is rotatably provided with a cross rod in a penetrating manner, the outer end of the cross rod is connected with a hand wheel, and the inner end of the cross rod is connected with the control sleeve through a bevel gear in a transmission manner.
2. The flat gate valve for an oilfield according to claim 1, wherein: a first boss positioned at the center is arranged at the bottom in the support, a first adjusting ring is connected to the first boss in a threaded manner, a mounting groove is formed in the lower end of the switching block, the mounting groove is rotatably sleeved at the upper end of the first adjusting ring, a first bearing is arranged between the mounting groove and the first adjusting ring, the corresponding switching block and the corresponding control block can also move up and down in the control sleeve for adjustment, and a disc spring is arranged between the upper end surface of the control block and the inner top surface of the control sleeve; the valve rod passes through the first boss and the first adjusting ring.
3. The flat gate valve for an oilfield according to claim 1, wherein: a second boss positioned in the center is arranged at the outer bottom of the cylinder body, a second adjusting ring is in threaded connection with the second boss, a T-shaped connecting sleeve is arranged at the upper end of the control sleeve, the second adjusting ring is sleeved at the upper end of the T-shaped connecting sleeve, a limiting flange is arranged on the inner wall of the middle part of the second adjusting ring, a second bearing is arranged between the upper end surface of the T-shaped connecting sleeve and the lower end surface of the limiting flange, a split ring and a positioning ring which are distributed up and down are arranged in the lower end of the second adjusting ring, and the split ring and the positioning ring are sleeved on the T-shaped connecting sleeve and are; the connecting rod passes through second boss, second regulation circle and adapter sleeve.
4. The flat gate valve for an oilfield according to claim 1, wherein: the switching handle locking structure comprises an anti-loosening sheet which can be hinged to the outer side wall of the control sleeve in an up-and-down overturning manner, and the anti-loosening sheet after being overturned downwards is in circumferential limit fit with the switching handle positioned at the starting end and the terminal end of the rotating path.
5. The flat gate valve for an oilfield according to claim 1, wherein: the guide groove is an arc-shaped groove, and the distance between the arc-shaped groove and the valve rod is gradually changed.
6. The flat gate valve for an oilfield according to claim 1, wherein: and the valve cover is provided with a grease injection nozzle communicated with the sealing assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010815153.7A CN111895162B (en) | 2020-08-14 | 2020-08-14 | Flat gate valve for oil field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010815153.7A CN111895162B (en) | 2020-08-14 | 2020-08-14 | Flat gate valve for oil field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111895162A true CN111895162A (en) | 2020-11-06 |
| CN111895162B CN111895162B (en) | 2022-04-26 |
Family
ID=73229026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010815153.7A Active CN111895162B (en) | 2020-08-14 | 2020-08-14 | Flat gate valve for oil field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111895162B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324084A (en) * | 2021-03-12 | 2021-08-31 | 温州凯格赛扬智能科技有限公司 | Dual-purpose control valve convenient to operate |
| CN113324085A (en) * | 2021-03-12 | 2021-08-31 | 温州凯格赛扬智能科技有限公司 | Operation method of manual and electric dual-purpose valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080078968A1 (en) * | 2006-10-03 | 2008-04-03 | Smc Kabushiki Kaisha | Manual Switching Valve |
| CN202451866U (en) * | 2012-01-13 | 2012-09-26 | 凯泰阀门(集团)有限公司 | Improved soft sealing gate valve |
| CN202927220U (en) * | 2012-11-06 | 2013-05-08 | 挺宇集团有限公司 | Central manual device for pneumatic linear actuator |
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| CN103557340A (en) * | 2013-11-19 | 2014-02-05 | 兰州理工大学 | Plate gate valve for adjusting flow rate |
| CN104074983A (en) * | 2013-03-25 | 2014-10-01 | 挺宇集团有限公司 | A self-operated bidirectional fast stop valve |
| CN204226814U (en) * | 2014-11-03 | 2015-03-25 | 大连创普斯控制设备有限公司 | The manual automatic transfer equipment of a kind of modulating valve |
| CN204628758U (en) * | 2015-04-15 | 2015-09-09 | 上海弘盛特种阀门制造有限公司 | Manual down-mounting type cylinder |
| CN206754558U (en) * | 2017-04-17 | 2017-12-15 | 爱诺阀门温州有限公司 | A kind of single-acting normally closed type pneumatic actuator |
| CN208831860U (en) * | 2018-09-29 | 2019-05-07 | 浙江挺宇流体设备股份有限公司 | A kind of built-in pneumatic actuator |
| CN209925655U (en) * | 2019-04-28 | 2020-01-10 | 浙江派沃自控仪表有限公司 | Pneumatic cut-off gate valve |
| CN111006031A (en) * | 2019-12-15 | 2020-04-14 | 永嘉企达知识产权咨询有限公司 | Flat gate valve for oilfield pipeline |
| CN210566369U (en) * | 2019-06-04 | 2020-05-19 | 浙江孚格流体控制设备有限公司 | Double-cylinder pneumatic actuator |
-
2020
- 2020-08-14 CN CN202010815153.7A patent/CN111895162B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080078968A1 (en) * | 2006-10-03 | 2008-04-03 | Smc Kabushiki Kaisha | Manual Switching Valve |
| CN202451866U (en) * | 2012-01-13 | 2012-09-26 | 凯泰阀门(集团)有限公司 | Improved soft sealing gate valve |
| CN202927220U (en) * | 2012-11-06 | 2013-05-08 | 挺宇集团有限公司 | Central manual device for pneumatic linear actuator |
| CN104074983A (en) * | 2013-03-25 | 2014-10-01 | 挺宇集团有限公司 | A self-operated bidirectional fast stop valve |
| CN203297646U (en) * | 2013-06-04 | 2013-11-20 | 方圆阀门集团有限公司 | Floating double disc flat gate valve |
| CN103557340A (en) * | 2013-11-19 | 2014-02-05 | 兰州理工大学 | Plate gate valve for adjusting flow rate |
| CN204226814U (en) * | 2014-11-03 | 2015-03-25 | 大连创普斯控制设备有限公司 | The manual automatic transfer equipment of a kind of modulating valve |
| CN204628758U (en) * | 2015-04-15 | 2015-09-09 | 上海弘盛特种阀门制造有限公司 | Manual down-mounting type cylinder |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324084A (en) * | 2021-03-12 | 2021-08-31 | 温州凯格赛扬智能科技有限公司 | Dual-purpose control valve convenient to operate |
| CN113324085A (en) * | 2021-03-12 | 2021-08-31 | 温州凯格赛扬智能科技有限公司 | Operation method of manual and electric dual-purpose valve |
| CN113324084B (en) * | 2021-03-12 | 2022-07-12 | 温州凯格赛扬智能科技有限公司 | Dual-purpose control valve convenient to operate |
| CN113324085B (en) * | 2021-03-12 | 2022-07-15 | 温州凯格赛扬智能科技有限公司 | Operation method of manual and electric dual-purpose valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111895162B (en) | 2022-04-26 |
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