CN207687360U - A kind of hydraulic-driven pilot-operated type quick action emergency valve - Google Patents
A kind of hydraulic-driven pilot-operated type quick action emergency valve Download PDFInfo
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- CN207687360U CN207687360U CN201721516411.1U CN201721516411U CN207687360U CN 207687360 U CN207687360 U CN 207687360U CN 201721516411 U CN201721516411 U CN 201721516411U CN 207687360 U CN207687360 U CN 207687360U
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Abstract
The utility model belongs to valve technology field, it is proposed that a kind of hydraulic-driven pilot-operated type quick action emergency valve, including valve body, flap, valve deck and telescopic rod.The valve chamber of valve body is divided into left chamber by flap, right chamber and epicoele, it is located at upper cavity inner sleeve outside telescopic rod and is equipped with guide's spring, one end of guide's spring and the top of pilot head connect, the other end is connect with valve deck, the upper end of telescopic rod is connect with a hydraulic device, hydraulic device includes the power cylinder cavity being arranged above valve deck, sealed set is slided up and down in power cylinder cavity a piston, piston is connect with telescopic rod, power cylinder cavity is divided into power cylinder epicoele and power cylinder cavity of resorption by piston, power cylinder epicoele and power cylinder cavity of resorption are connect with hydraulic station, solving must be opened manually when in use, meet weather reason it is extremely inconvenient using and using when in no fluid pressure flap can not automatically open or cannot completely open technical problem.
Description
Technical field
The utility model belongs to valve technology field, is related to a kind of hydraulic-driven pilot-operated type quick action emergency valve.
Background technology
Authorization Notice No. be CN102297278B Chinese patent disclose a kind of quick action emergency valve, including valve body,
The valve chamber of valve body is divided into left chamber, right chamber and epicoele by flap and valve deck, flap, and the left and right ends of valve deck are both provided with inverted U and lead to
Road 4, is provided with check valve 5 on inverted U channel 4, valve deck top be provided with low tension magnetic-type Telescopic rod device, pass through electromagnet
Control telescopic rod moves up and down, and realizing can be automatically closed under emergency as long as stop valve of cutting off the power, but exists
The problem of have：
1, it must be opened manually when in use, meet the extremely inconvenient use of weather reason.
There is no flap when fluid pressure that can not automatically open or cannot open completely when 2, using.
Utility model content
The utility model proposes a kind of hydraulic-driven pilot-operated type quick action emergency valves, solve above-mentioned technical problem.
What the technical solution of the utility model was realized in：
A kind of hydraulic-driven pilot-operated type quick action emergency valve, including：
The valve chamber of the valve body is divided into left chamber, right chamber and epicoele, stretched by valve body, flap, valve deck and telescopic rod, the flap
The lower end of contracting bar is provided with pilot head, and it stretches into intracavitary across the valve deck, is provided on the flap and the guide
The pilot hole that matches of head is located in epicoele on the telescopic rod and is arranged with guide's spring, one end of guide's spring and institute
The top connection of pilot head is stated, the other end is connect with the valve deck, and the upper end of the telescopic rod is connect with a hydraulic device, described
Hydraulic device includes the power cylinder cavity being arranged above the valve deck, is slided up and down in the power cylinder cavity and is provided with a work
Plug, the piston are connect with the telescopic rod, and the power cylinder cavity is divided under power cylinder epicoele and power cylinder by the piston
Chamber, the power cylinder cavity of resorption are connect with hydraulic station, and intracavitary is provided with power cylinder spring, the power cylinder spring on the power cylinder
Both ends respectively with connect at the top of the piston and the power cylinder cavity.
As further technical solution, the hydraulic station includes fuel tank, and the fuel tank passes sequentially through oil pump and hydraulic pressure list
It is connected to valve with the power cylinder cavity of resorption, the power cylinder cavity of resorption passes sequentially through 2/2-way solenoid valve and throttle valve and the oil
Case is connected to.
As further technical solution, the fuel tank is also connected to the power cylinder epicoele.
As further technical solution, the oil pump is connect by filter with the fuel tank, and the oil pump passes through
Overflow valve for pressure release is connect with the hydraulically-controlled one-way valve, and the overflow valve is connect with the fuel tank.
As further technical solution, it is provided on the flap and limits the limiting card that the telescopic rod moves up
Part.
As further technical solution, the limited block includes the annular stop being arranged in the pilot hole surrounding
The bottom end of part, the annular stop part is connect with the flap, and top is provided with the ring for blocking the pilot head top edge
Shape convex edge is provided with channel on the annular stop part, and the telescopic rod moves up the rear channel and the pilot hole phase
It is intercommunicated.
As further technical solution, the channel is the through-hole being arranged on the annular stop part.
Compared with prior art, it utility model works principle and has the beneficial effect that：
1, in the utility model, quick action emergency valve includes valve body, flap and valve deck, and the valve chamber of valve body is divided into a left side by flap
Chamber, right chamber and epicoele, flap are piston type flap, and side wall and the epicoele of flap are slidingly sealed cooperation, in the upper left quarter valve of valve body
It is provided with the left Vertical Channel being connected to left chamber on body, the left side being connected to upper left chamber is provided on the left part valve deck of valve deck
The Zuo Kou in inverted U channel, the inverted U channel in left side is connected to left Vertical Channel, and check valve is provided in left Vertical Channel,
It is provided with the right Vertical Channel of right chamber connection on the upper right quarter valve body of valve body, is provided on the right part valve deck of valve deck and upper right chamber
The right inverted U channel of connection, the You Kou in right inverted U channel are connected to right Vertical Channel, and list is also equipped in right Vertical Channel
To valve, pilot hole is offered at the center of flap, is equipped with fluid pressure type telescopic rod on the top of valve deck, the telescopic rod of fluid pressure type passes through
Valve deck puts in intracavitary, telescopic rod slides Fluid Sealing with valve deck, is provided in the lower end of telescopic rod and matches with pilot hole
Pilot head, in normal operation, Telescopic rod device under the hydraulic action of hydraulic device, telescopic rod retraction, pilot head with
Pilot hole is detached from mated condition, and the fluid that epicoele is entered from check valve of the left chamber through left side enters right chamber, epicoele shape through pilot hole
Not at pressure, left chamber fluid jacks up flap, and left chamber is connected to right chamber, and quick action emergency valve hydraulic system in the conduction state is in
Stable state is cut off the power when meeting emergency episode, and hydraulic device opens release power hydraulic cylinder pressure, the first guided missile of telescopic rod
Under the action of spring, telescopic rod stretches out, and pilot head closes pilot hole, while the channel between valve flap seals left chamber and right chamber, from a left side
The fluid that chamber enters epicoele through left check valve cannot enter right chamber through pilot hole, due to flap upper portion pressurized area be more than lower part by
Pressure surface accumulates, and flap firmly closes in the channel between left chamber and right chamber, and in case of exceptional circumstances, right chamber pressure is more than left chamber pressure
When, fluid enters epicoele through right check valve, and the channel between left chamber and right chamber is still firmly closed by flap, cannot open.
2, in the utility model, power hydraulic cylinder is fixed on by holder on valve deck, lower part have telescopic rod and with pilot hole phase
Mating pilot head, power cylinder cavity of resorption leans on the oil liquid pressure that hydraulic station provides in the case of normal power-up, and telescopic rod is made to shift up,
Pilot head with hydraulic telescopic rod lower end is opened, and valve upper cavity pressure is made to reduce and by attachment device flap pull-up, a left side for valve
Chamber is connected to right chamber, and when having a power failure, power cylinder cavity of resorption loses oil liquid pressure, in the collective effect of power cylinder spring and guide's spring
Under so that piston driving telescopic rod is moved down the channel between closing left chamber and right chamber, play the role of closing, it is urgent when encountering
When accident, release power hydraulic cylinder pressure is opened in hydraulic station of cutting off the power power-off, and telescopic rod also can be in power cylinder spring and guide
Realization is moved down under the collective effect of spring to be automatically closed, therefore the setting of power cylinder epicoele and power cylinder cavity of resorption is realized and cut
Disconnected valve easily switchs, hydraulic station with piston to keep the mode that telescopic rod moves up and down convenient and safe, therefore the side of hydraulic pressure
Formula realizes the opening of valve body, and realizes automatic cutting in emergency function when power-off, stable connection and simple in structure, solves
It needs to be opened manually and lead to technical problem inconvenient to use.
3, in the utility model, when emergency powers off, power cylinder cavity of resorption loses the oil pressure of hydraulic station offer, in power cylinder
It pushes piston to move down under the action of power cylinder spring in epicoele, and moves down telescopic rod under the action of formerly guided missile spring is common,
Pilot head closes pilot hole, and the setting of power cylinder spring strengthens whole active force, and applies from the top of telescopic rod and make
Firmly, telescopic rod stress is made more to stablize, and more convenient valve when realizing power-off of setting of power cylinder spring from
Dynamic cut-out；2/2-way solenoid valve is in the state for being powered and disconnecting when normal work, and oil pump is by hydraulically-controlled one-way valve to power cylinder
Hydraulic pressure is provided in cavity of resorption, telescopic rod moves up, and after power-off, state and oil pump that 2/2-way solenoid valve is on stop conveying
Oil pressure, at this time the oil pressure in power cylinder cavity of resorption pass sequentially through in 2/2-way solenoid valve and throttle valve pressure release to fuel tank, power cylinder
Oil pressure is lost in cavity of resorption, power cylinder spring, which starts to play a role, makes telescopic rod move down, stable structure and while realizing power-off is urgent
The function that can be automatically turned on when cutting off and working；The setting of limited block lives flap while telescopic rod moves up
Pull-up is filled in, does not have when fluid pressure flap that can not automatically open or cannot completely open technical problem when solving use；First
Top guide moves up and down in annular stop part, and when being moved upwards up to annular convex edge, annular convex edge blocks pilot head, to telescopic rod
It drives flap to move up together, opens pilot hole, while the fluid in epicoele can be flowed by channel in pilot hole, be eliminated
The pressure of epicoele realizes the conducting of fluid；Channel is through-hole, and through-hole is uniformly arranged along annular stop part axial and circumferential.
Description of the drawings
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is A partial enlargement structural representations in the utility model；
In figure：1- valve bodies, 2- flaps, 3- valve decks, 4-U types channel, 5- check valves, 6- telescopic rods, 7- pilot heads, 8- hydraulic pressure
Device, 81- power cylinder cavitys, 82- pistons, 83- power cylinder epicoeles, 84- power cylinder cavity of resorptions, 85- hydraulic stations, 851- oil pumps,
852- hydraulically-controlled one-way valves, 853- 2/2-way solenoid valves, 854- throttle valves, 855- filters, 856- overflow valves, 857- fuel tanks,
86- power cylinder springs, 9- guide's spring, 10- pilot holes, 11- limited blocks, 111- annular stop parts, 112- annular convex edges,
The channels 113-.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
As depicted in figs. 1 and 2, the utility model proposes a kind of hydraulic-driven pilot-operated type quick action emergency valves, including：
The valve chamber of valve body 1 is divided into left chamber, right chamber and epicoele by valve body 1, flap 2, valve deck 3 and telescopic rod 6, flap 2, is stretched
The lower end of bar 6 is provided with pilot head 7, and it stretches into intracavitary across valve deck 3, is provided on flap 2 and matches with pilot head 7
Pilot hole 10, telescopic rod 6 are located at upper cavity inner sleeve and are equipped with guide's spring 9 outside, and one end and the top of pilot head 7 of guide's spring 9 connect
It connects, the other end is connect with valve deck 3, and the upper end of telescopic rod 6 is connect with a hydraulic device 8, and hydraulic device 8 includes being arranged in valve deck 3
The power cylinder cavity 81 of top, sealed set is slided up and down in power cylinder cavity 81 has a piston 82, piston 82 to connect with telescopic rod 6
It connects, piston 82 divides power cylinder cavity 81 for power cylinder epicoele 83 and power cylinder cavity of resorption 84, under power cylinder epicoele 83 and power cylinder
Chamber 84 is connect with hydraulic station 85.
In the present embodiment, quick action emergency valve includes valve body 1, flap 2 and valve deck 3, and the valve chamber of valve body 1 is divided into a left side by flap 2
Chamber, right chamber and epicoele, flap 2 are piston type flap, and side wall and the epicoele of flap 2 are slidingly sealed cooperation, in the upper left quarter of valve body 1
It is provided with the left Vertical Channel being connected to left chamber on valve body 1, is provided on the left part valve deck 3 of valve deck 3 and to be connected to upper left chamber
The Zuo Kou in the inverted U channel 4 in left side, the inverted U channel 4 in left side is connected to left Vertical Channel, is provided in left Vertical Channel
Check valve 5 is provided with the right Vertical Channel of right chamber connection, on the right part valve deck 3 of valve deck 3 on the upper right quarter valve body 1 of valve body 1
It is provided with the right inverted U channel 4 being connected to upper right chamber, the You Kou in right inverted U channel 4 is connected to right Vertical Channel, right vertical
It is also equipped with check valve 5 on channel, pilot hole 10 is offered at the center of flap 2, it is flexible equipped with fluid pressure type on the top of valve deck 3
The telescopic rod 6 of bar 6, fluid pressure type puts in intracavitary across valve deck 3, and telescopic rod 6 slides Fluid Sealing with valve deck 3, in telescopic rod 6
Lower end is provided with the pilot head 7 to match with pilot hole 10, and in normal operation, 6 device of telescopic rod is in hydraulic device 8
Under hydraulic action, telescopic rod 6 bounces back, and pilot head 7 and pilot hole 10 are detached from mated condition, from check valve 5 of the left chamber through left side into
The fluid for entering epicoele enters right chamber through pilot hole 10, and epicoele can not form pressure, and left chamber fluid jacks up flap 2, left chamber and right chamber
Connection, quick action emergency valve hydraulic system in the conduction state are in stable state, cut off the power when meeting emergency episode, hydraulic pressure dress
Set 8 openings release power hydraulic cylinder pressure, under the collective effect of 6 first guided missile spring 9 of telescopic rod and power cylinder spring 86, telescopic rod
6 stretch out, and pilot head 7 closes pilot hole 10, while flap 2 closes the channel between left chamber and right chamber, from left chamber through left check valve 5
Fluid into epicoele cannot enter right chamber through pilot hole 10, since 2 upper portion pressurized area of flap is more than lower compression area, valve
Valve 2 firmly closes in the channel between left chamber and right chamber, in case of exceptional circumstances, when right chamber pressure is more than left chamber pressure, fluid warp
Right check valve 5 enters epicoele, and the channel between left chamber and right chamber is still firmly closed by flap 2, cannot be opened.
Power hydraulic cylinder is fixed on by holder on valve deck 3, the pilot head that there is telescopic rod 6 in lower part and matches with pilot hole 10
7, the oil liquid pressure that power cylinder cavity of resorption 84 is provided by hydraulic station 85 under normal circumstances makes telescopic rod 6 shift up, band hydraulically extensible
The pilot head 7 of 6 lower end of bar is opened, and valve upper cavity pressure is made to reduce and by attachment device 2 pull-up of flap, the left chamber and right chamber of valve
Connection, when having a power failure, power cylinder cavity of resorption 84 loses oil liquid pressure, makes work under the collective effect of power cylinder spring and guide's spring
82 drive telescopic rods 6 of plug move down the channel between closing left chamber and right chamber, play the role of closing, when encountering emergency episode
When, release power hydraulic cylinder pressure is opened in hydraulic station 85 of cutting off the power power-off, and telescopic rod 6 also can be in power cylinder spring 86 and guide
Realization is moved down under the collective effect of spring 9 to be automatically closed, therefore the setting of power cylinder epicoele 83 and power cylinder cavity of resorption 84 is real
Showed stop valve easily to switch, hydraulic station with piston 82 to keep the mode that telescopic rod 6 moves up and down convenient and safe, therefore
The mode of hydraulic pressure realizes the opening of valve body, and realizes automatic cutting in emergency function when power-off, stable connection and structure letter
It is single, it solves needs and is opened manually and leads to technical problem inconvenient to use.
Be provided with power cylinder spring 86 in power cylinder epicoele 83, the both ends of power cylinder spring 86 respectively with piston 82 and power
The 81 top connection of cylinder cavity.
In the present embodiment, when emergency powers off, power cylinder cavity of resorption 84 loses the oil pressure of the offer of hydraulic station 85, in power cylinder
It pushes piston 82 to move down under the action of power cylinder spring 86 in epicoele 83, and will stretch under the action of formerly guided missile spring 9 is common
Bar 6 moves down, and pilot head 7 closes pilot hole 10, and the setting of power cylinder spring 86 strengthens whole active force, and from telescopic rod
6 top applies active force, and 6 stress of telescopic rod is made more to stablize, and the more convenient realization of setting of power cylinder spring 86
Valve automatically cuts off when power-off.
Further, the hydraulic station 85 includes fuel tank 857, and fuel tank 857 passes sequentially through oil pump 851 and hydraulically-controlled one-way valve 852
It is connected to power cylinder cavity of resorption 84, power cylinder cavity of resorption 84 passes sequentially through 2/2-way solenoid valve (853) and throttle valve 854 and fuel tank
857 connections.
In the present embodiment, 2/2-way solenoid valve 853 passes through in the state disconnected that is powered, oil pump 851 when normal work
Hydraulically-controlled one-way valve 852 provides hydraulic pressure into power cylinder cavity of resorption 84, and telescopic rod 6 moves up, after power-off, at 2/2-way solenoid valve 853
Stop conveying oil pressure in the state and oil pump 851 of conducting, the oil pressure in power cylinder cavity of resorption 84 passes sequentially through 2/2-way at this time
In solenoid valve 853 and throttle valve 854 pressure release to fuel tank 857, oil pressure is lost in power cylinder cavity of resorption 84, power cylinder spring 86 starts to send out
The effect of waving makes telescopic rod 6 move down, stable structure and the function that emergency cut-off and while working can automatically turn on when realizing power-off.
Further, fuel tank 857 is also connected to power cylinder epicoele 83.
Further, oil pump 851 is connect by filter 855 with fuel tank 857, and oil pump 851 passes through the overflow for pressure release
Valve 856 is connect with hydraulically-controlled one-way valve 852, and overflow valve 856 is connect with fuel tank 857.
In the present embodiment, fuel tank 857 is also connected to the power cylinder epicoele 83, when 82 poor sealing of piston, power
After part oil in cylinder cavity of resorption 84 leaks to power cylinder epicoele 83, fuel tank 857 can be flowed into.
Further, the limited block 11 that limit telescopic bar 6 moves up is provided on flap 2.
In the present embodiment, the setting of limited block 11, by flap piston pull-up, solution while telescopic rod 6 moves up
Determined use when there is no when fluid pressure flap that can not automatically open or cannot completely open technical problem.
Further, limited block 11 includes the annular stop part 111 being arranged in 10 surrounding of pilot hole, annular stop part 111
Bottom end connect with flap 2, top is provided with the annular convex edge 112 for blocking 7 top edge of pilot head, annular stop part 111
On be provided with channel 113, telescopic rod 6 moves up rear channel 113 and is interconnected with pilot hole 10.
In the present embodiment, pilot head 7 moves up and down in annular stop part 111, when being moved upwards up to annular convex edge 112,
Annular convex edge 112 blocks pilot head 7, to which telescopic rod 6 drives flap 2 to move up together, opens pilot hole 10, while epicoele
In fluid can by channel 113 flow into pilot hole in, eliminate the pressure of epicoele, realize the conducting of fluid.
Further, channel 113 is the through-hole being arranged on annular stop part 111.
In the present embodiment, channel 113 is through-hole, and through-hole is uniformly arranged along 111 axial and circumferential of annular stop part.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection domain within.
Claims (7)
1. a kind of hydraulic-driven pilot-operated type quick action emergency valve, including valve body (1), flap (2), valve deck (3) and telescopic rod (6), institute
It states flap (2) and the valve chamber of the valve body (1) is divided into left chamber, right chamber and epicoele, the lower end of the telescopic rod (6) is provided with guide
Head (7), and it stretches into intracavitary across the valve deck (3), is provided on the flap (2) and matches with the pilot head (7)
Pilot hole (10), which is characterized in that be located in epicoele on the telescopic rod (6) and be arranged with guide's spring (9), elder generation's guided missile
One end of spring (9) is connect with the top of the pilot head (7), and the other end is connect with the valve deck (3),
The upper end of the telescopic rod (6) is connect with a hydraulic device (8), and the hydraulic device (8) includes being arranged in the valve deck
(3) the power cylinder cavity (81) above, interior slide up and down of the power cylinder cavity (81) are provided with a piston (82), the piston
(82) connect with the telescopic rod (6), the piston (82) by the power cylinder cavity (81) be divided into power cylinder epicoele (83) and
Power cylinder cavity of resorption (84), the power cylinder cavity of resorption (84) connect with hydraulic station (85), are provided in the power cylinder epicoele (83)
Power cylinder spring (86), the both ends of the power cylinder spring (86) respectively with the piston (82) and the power cylinder cavity (81)
Top connects.
2. a kind of hydraulic-driven pilot-operated type quick action emergency valve according to claim 1, which is characterized in that the hydraulic station
(85) include fuel tank (857), the fuel tank (857) passes sequentially through oil pump (851) and hydraulically-controlled one-way valve (852) and the power cylinder
Cavity of resorption (84) be connected to, the power cylinder cavity of resorption (84) pass sequentially through 2/2-way solenoid valve (853) and throttle valve (854) with it is described
Fuel tank (857) is connected to.
3. a kind of hydraulic-driven pilot-operated type quick action emergency valve according to claim 2, which is characterized in that the fuel tank
(857) it is also connected to the power cylinder epicoele (83).
4. a kind of hydraulic-driven pilot-operated type quick action emergency valve according to claim 2, which is characterized in that the oil pump
(851) it is connect with the fuel tank (857) by filter (855), and the oil pump (851) passes through the overflow valve for pressure release
(856) it is connect with the hydraulically-controlled one-way valve (852), the overflow valve (856) connect with the fuel tank (857).
5. a kind of hydraulic-driven pilot-operated type quick action emergency valve according to Claims 1 to 4 any one, which is characterized in that
It is provided on the flap (2) and limits the limited block (11) that the telescopic rod (6) moves up.
6. a kind of hydraulic-driven pilot-operated type quick action emergency valve according to claim 5, which is characterized in that the limited block
(11) include setting the pilot hole (10) surrounding annular stop part (111), the bottom end of the annular stop part (111) with
Flap (2) connection, top is provided with the annular convex edge (112) for blocking the pilot head (7) top edge, the annular
Channel (113) is provided on locating part (111), the telescopic rod (6) moves up the rear channel (113) and the pilot hole
(10) it is interconnected.
7. a kind of hydraulic-driven pilot-operated type quick action emergency valve according to claim 6, which is characterized in that the channel
(113) it is the through-hole being arranged on the annular stop part (111).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721516411.1U CN207687360U (en) | 2017-11-14 | 2017-11-14 | A kind of hydraulic-driven pilot-operated type quick action emergency valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721516411.1U CN207687360U (en) | 2017-11-14 | 2017-11-14 | A kind of hydraulic-driven pilot-operated type quick action emergency valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207687360U true CN207687360U (en) | 2018-08-03 |
Family
ID=62988579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721516411.1U Active CN207687360U (en) | 2017-11-14 | 2017-11-14 | A kind of hydraulic-driven pilot-operated type quick action emergency valve |
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| Country | Link |
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| CN (1) | CN207687360U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635986A (en) * | 2021-04-06 | 2022-06-17 | 陈蕾蕾 | Valve capable of being automatically closed under influence of pressure |
-
2017
- 2017-11-14 CN CN201721516411.1U patent/CN207687360U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635986A (en) * | 2021-04-06 | 2022-06-17 | 陈蕾蕾 | Valve capable of being automatically closed under influence of pressure |
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