CN207750541U - The quick flap valve of decompression type - Google Patents
The quick flap valve of decompression type Download PDFInfo
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- CN207750541U CN207750541U CN201820062525.1U CN201820062525U CN207750541U CN 207750541 U CN207750541 U CN 207750541U CN 201820062525 U CN201820062525 U CN 201820062525U CN 207750541 U CN207750541 U CN 207750541U
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- flap valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model discloses a kind of quick flap valves of decompression type, it include mainly main flap valve seat, main flap valve, lifting appliance, it is characterized in that being also equipped with decompression flap valve on the main flap valve, and the limit gusset of position-limiting action is played to decompression flap valve, the main through-hole by being opened on main flap valve of the decompression flap valve, mounted on the decompression flap valve seat of through-hole surrounding, the decompression flap valve door body being hinged on decompression flap valve seat is constituted, the lifting appliance is hydraulic hoisting equipment, mainly by support base, lift by crane lever, hydraulic cylinder, steel wire rope and with the numerical control petrol station of throttle valve and Numerical control valve constitute.The slow release water vertical pressure generated when the utility model reduces power when opening flap valve and closes flap valve, greatly reduce production cost, safety and reliability, and it can realize the quick open and close of flap valve, solve the problems, such as that current water-power plant pressure piping water inlet flap valve is unable to quick closedown, to ensure that the safe and stable operation in power station increases safety precautions.
Description
Technical field
The utility model is related to hydraulic and hydroelectric engineering equipment, specifically for quick on the pressure piping of water power power station
The quick flap valve of decompression type of closing.
Background technology
Currently, water power power station pressure piping is common arch form plain cast iron flap valve and plane fixed wheel steel plate flap valve.
Its structure and working principle is：Flap valve is hinged to the water inlet for being installed on pressure piping（It is installed on the flap valve seat of water inlet surrounding
There are watertight rubber, hinged place to be located at the top of water inlet）, steel wire rope is connected on flap valve, and the other end and the lifting of steel wire rope are set
Standby connection.Under flap valve closed state, steel wire rope is in relaxed state, and flap valve is under the action of gravity and external water pressure, tightly
It is tightly attached on the watertight rubber of pressure piping water inlet, to prevent external water stream from entering pressure piping.When needing power generation, open
Dynamic lifting appliance pulls up steel wire rope, and steel wire rope pulls flap valve to be dug upwards centered on hinged place again（Such as flap valve in attached drawing 1
Shown state）, to open the water inlet of pressure piping, flow enters pressure piping and drives generating set hair by the hydraulic turbine
Electricity.When needing to close flap valve, reverse starting lifting appliance makes steel wire rope decline, and flap valve is in gravity and subsequent water pressure
Under effect, it is returned to pressure piping water inlet again and blocks water inlet.
For existing flap valve, during open and close described above, be primarily present following two points defect with
It is insufficient：1, under water, the depth of water is even more deep up to more than ten rice sometimes, acts on the water pressure on flap valve panel for pressure piping installation
It is huge, when flap valve needs to open in the off state, since huge effect of water pressure is on flap valve panel, lead to lifting appliance
When using turning door in steel wire rope pull-up, high-power lifting appliance is needed to generate huge tractive force, has both caused the purchase of equipment
It buys excessively high with operating cost, it is also possible to steel wire rope be caused to be forgotten about it and cause safety accident；2, when opening flap valve, due to by
To huge water pressure, can only unlatching flap valve slowly be promoted using slow-motion journey lifting appliance, cannot achieve quick unlatching, meanwhile,
Again as a result of single slow-motion journey lifting appliance, and water turbine set governor and inlet valve be out of control or pressure piping occurs
When accident needs to need quick closedown flap valve in the case of emergency shutdown, but can not quick closedown flap valve, pressure piping water inlet
Mouth is not a great security risk in the flap valve of dynamic water quick closedown, once governor and water inlet gate valve tripping
If will result in when the loss of personnel and equipment, especially pressure piping damage that consequence is hardly imaginable, it is possible to cause serious
Safety accident.
Utility model content
The utility model lies in that providing a kind of quick for the decompression for quick closedown on the pressure piping of water power power station
Flap valve, to solve the disadvantage in above-mentioned background technology and deficiency.
The technical issues of the utility model is solved is realized using following technical scheme：
The quick flap valve of decompression type includes mainly the main flap valve seat mounted on pressure piping water inlet surrounding, is hingedly mounted on
Main flap valve on main flap valve seat, and to lift by crane the lifting appliance of main flap valve, it is characterised in that：Also pacify on the main flap valve
Equipped with decompression flap valve, and to decompression flap valve open position rise position-limiting action limit gusset, the decompression flap valve mainly by
The through-hole being opened on main flap valve is mounted on the decompression flap valve seat of through-hole surrounding, is hinged on decompression flap valve seat and can be clapped with decompression
The decompression flap valve door body that gate seat fits closely is constituted, and the limit gusset is installed on main flap valve after decompression flap valve door body
Side, the lifting appliance are hydraulic hoisting equipment, mainly by support base, lifting lever, hydraulic cylinder, steel wire rope, and
Numerical control petrol station with throttle valve, Numerical control valve is constituted, and lifting lever is hingedly mounted on support base, hydraulic cylinder and a trapeze
Bar is articulated and connected, and one end of steel wire rope is connect with lifting lever, and the other end is connect with decompression flap valve door body.
For the utility model, the quantity of the limit gusset is two pieces or equally distributed polylith.
For the utility model, the place of docking of the main flap valve and main flap valve seat, and decompression flap valve door body are clapped with decompression
At the docking of gate seat, it is fitted with hermetic seal rubber.
For the utility model, the main flap valve and main flap valve seat be hinged and main flap valve and decompression flap valve door body
It is hinged, all use the articulated manner of axle sleeve and axis.
For the utility model, the numerical control petrol station is mainly made of digital control system, Numerical control valve, throttle valve, oil storage tank.
For the utility model, the quantity for the decompression flap valve installed on the main flap valve is one, or is uniformly distributed
Two or more, each flap valve that depressurizes connect by steel wire rope with lifting appliance, and is each depressurized flap valve and be equipped with
Limit gusset.
Advantageous effect：The utility model first opens decompression flap valve, waits for main flap valve back side and upstream face water when starting shooting
Position is then turned on main flap valve when equal, and main flap valve is first closed when closing flap valve, rear to close decompression flap valve, can greatly reduce unlatching in this way
Power when flap valve, and the water vertical pressure generated is discharged when closing flap valve at leisure, production greatly reduces in this way and safeguards
Cost, safety and reliability；Due to having mixed numerical control petrol station, the closing of flap valve and opening time are adjustable, and due to having mixed oil storage
Tank ensures to remain to close flap valve under power-off condition（It must have control power supply）, solve current water-power plant pressure pipe
Road water inlet flap valve is unable to the problem of quick closedown, can be convenient to realize that power station automation has done last a set of safety guarantee
Realization automatically controls, and ensures the safe and stable operation in power station.
Description of the drawings
Fig. 1 is the front view of the utility model；
Fig. 2 is the left view of the utility model；
Fig. 3 is the A-A vertical views of the utility model.
In figure：1- pressure pipings, the main flap valve seats of 2-, the main flap valves of 3-, 4- limit gusset, 5- through-holes, and 6- depressurizes flap valve seat, 7-
Flap valve door body, 8- support bases are depressurized, 9- lifts by crane lever, 10- hydraulic cylinders, 11- steel wire ropes, the main flap valves of 12- and main flap valve seat
Hinged place, the hinged place of the main flap valves of 13- and decompression flap valve door body, 14- reinforced concretes.
Specific implementation mode
To specific embodiment of the present utility model, detailed description are as follows below in conjunction with the accompanying drawings：
As illustrated in the accompanying drawings from 1 to 3, include mainly the main flap valve seat 2 for being mounted on 1 water inlet surrounding of pressure piping, be hingedly mounted on
Main flap valve 3 on main flap valve seat, and to lift by crane the lifting appliance of main flap valve, it is characterised in that：On the main flap valve also
Decompression flap valve is installed, and plays the limit gusset 4 of position-limiting action to decompression flap valve open position, the decompression flap valve is main
By the through-hole 5 being opened on main flap valve, be mounted on the decompression flap valve seat 6 of through-hole surrounding, be hinged on decompression flap valve seat and can with subtract
The decompression flap valve door body 7 that pressure flap valve seat fits closely is constituted, and the limit gusset is installed on decompression flap valve door body on main flap valve
Rear, the lifting appliance be hydraulic hoisting equipment, mainly by support base 8, lifting lever 9, hydraulic cylinder 10, steel wire
Rope 11 and the numerical control petrol station with throttle valve, Numerical control valve（It is not shown in figure）It constitutes, lifting lever is hingedly mounted on support base
On, hydraulic cylinder and lifting lever articulated connection, one end of steel wire rope are connect with lifting lever, the other end and decompression flap valve door body
Connection.Each critical piece is illustrated respectively below：
Main flap valve seat 2：The frame made with I-steel or channel steel, with reinforced concrete 14 be fixed on pressure piping into
At mouthful, make special antirust and patching at the sealing that upstream face is contacted with main flap valve, to ensure permanent water-stagnating effect.Its
Main function is bearing main pressure and sealing of the flap valve from water.
Main flap valve 3：It is hingedly mounted on main flap valve seat, hinged place is located at the top of main flap valve seat, is that control enters pressure
The critical piece of pipeline water, back side（The one side touched with main flap valve seated connection）It is made of steel plate, upstream face is the reinforcing of steel
Tank bracket.The back side of steel plate has placed watertight rubber.Making watertight rubber, there are one tight contacts with the sealing face of main flap valve seat.
Limit gusset 4：It is made of steel plate, quantity is two pieces（It is symmetrical two pieces in attached drawing）Or it is equally distributed more
Block is installed on the rear that flap valve door body is depressurized on main flap valve（As shown in Fig. 1, after depressurizing the unlatching of flap valve door body, it can block and subtract
Pressure flap valve door body continues the side of overturning）.The effect of limit gusset is the movement position of limitation decompression flap valve door body：It is opened in flap valve
During opening, after depressurizing the unlatching of flap valve door body to certain position, is limited by limit gusset and can not be further continued for opening, subtracted
Pressure flap valve door body opens the position that reaches capacity, and hereafter, the upward pulling force of steel wire rope acts on main flap valve by depressurizing flap valve door body,
To pull main flap valve to dig upwards.Limit the data such as angle of gusset, can according to data such as flap valve size, lifting distances and
It is fixed, ensure after decompression flap valve door body is opened, still can effectively pull main flap valve and main flap valve is made to fully open.
Depressurize flap valve：It is one of two core technology points of this technology to depressurize flap valve.Flap valve is depressurized mainly by through-hole 5, is subtracted
Flap valve seat 6, decompression flap valve door body 7 is pressed to constitute.Through-hole 5 is one and is opened on main flap valve, through the hole of main flap valve, the purpose is to
After decompression flap valve door body is opened, water body can be flowed through from this through-hole.Decompression flap valve seat 6 is the through-hole frame with channel steel in main flap valve
The frame that frame surrounding is made, it is integral with main flap valve frame, it depressurizes and makees at the upstream face and decompression flap valve sealing of flap valve seat
Special antirust and patching, to ensure that water-stagnating effect, main function are support decompression pressure of the flap valve from water.Decompression is clapped
Door door body 7 is then equivalent to a small-sized common flap valve, and a side of decompression flap valve door body is hinged on decompression flap valve seat, another
Side is then connect with steel wire rope.Its main function is when opening main flap valve, and under the control of numerical control petrol station, hydraulic cylinder is upward
Action, lifting lever drives steel wire rope action, decompression flap valve is first turned on by rope traction power, and is carried out to pressure piping
Water-filling just opens main flap valve when the upstream face of main flap valve and equal back side hydraulic pressure, greatly alleviates water in this way to main bat
The pressure of door, to reduce the keying power of starter, due to greatly reducing the opening and closing power of headstock gear, from
And headstock gear simplification in technique is enable to achieve the purpose that safely and fast, to greatly reduce manufacture and operating cost, and prevent
The safety accident of wire cable rupture.When closing flap valve, under the control of numerical control petrol station, main flap valve is first closed, after depressurizing flap valve
It closes.
Lifting appliance：The lifting appliance of this flap valve use hydraulic hoisting equipment, mainly by support base 8, lifting lever 9,
Hydraulic cylinder 10, steel wire rope 11 and the numerical control petrol station with throttle valve, Numerical control valve are constituted, and lifting lever is hingedly mounted on support
On seat, hydraulic cylinder and lifting lever articulated connection, one end of steel wire rope are connect with lifting lever, the other end and decompression flap valve door
Body connects, and the numerical control petrol station is mainly made of digital control system, Numerical control valve, throttle valve, oil storage tank.The main work of lifting appliance
With being to drive lifting lever motion by the flexible of hydraulic cylinder, lifts by crane lever and drive flap valve to open or close by steel wire rope again
It closes.Meanwhile the on or off of Numerical control valve is controlled by digital control system, so that throttle valve is bypassed, changes oil circuit road to control hydraulic pressure
The speed of cylinder action realizes the speed that flap valve door body opens and closes.
Flap valve is depressurized, and the hydraulic hoisting equipment mating with decompression flap valve is the 2 big core technology points of this technology,
The two coordinates, and could realize decompression and quick closedown or the unlatching of flap valve：
1, for existing flap valve, the lifting of flap valve mostly uses the mode that hoist engine pulls steel wire rope lifting, to reduce
Impact force during lifting, the lifting of flap valve and decrease speed all have to slowly, therefore also must be slow using running speed
Slow hoist engine, cause in an emergency situation the slow hoist engine of running speed can not implement quickly to be turned on and off flap valve, i.e.,
Make to be to use decompression flap valve, can only also steel wire rope be allowed to depressurize, and cannot achieve quickly being turned on and off for flap valve.
Used if 2, not designing decompression flap valve simple hydraulic hoisting equipment and corresponding hydraulic cylinder directly with
It is existing clap it is directly hinged, hydraulic cylinder will hang tens tons of active forces that water body acts on flap valve, then hydraulic cylinder need
It is designed diameter and power is all very big, the production cost of hydraulic cylinder is caused to be doubled and redoubled, maintenance cost is high, and uses decompression
Flap valve is used cooperatively with hydraulic cylinder, then uses lower-powered hydraulic cylinder.
3, in entire hydraulic hoisting equipment, the Numerical control valve of hydraulic cylinder and the numerical control petrol station being connect with hydraulic cylinder and
Throttle valve is critical component.The on or off that Numerical control valve is controlled by digital control system, makes throttle valve bypass, and changes oil circuit road, from
And control the speed of hydraulic cylinder action（Under normal circumstances, throttle valve carries out throttling control to oil circuit, and small oil mass oil circuit controls liquid
Compressing cylinder slowly acts, and flap valve is driven slowly to open and close；In emergency circumstances, Numerical control valve control throttle valve bypasses big oil mass
Road, do not throttle to oil circuit control, to make hydraulic cylinder quick acting, flap valve is driven quickly to open and close）, throttle valve
The size of controllable oil mass, closing and the opening time for reaching flap valve are adjustable, realize the quick open and close of flap valve；And due to
Oil storage tank has been mixed, has ensured to remain to close flap valve under power-off condition（It must have control power supply）, solve current waterpower hair
Power station pressure piping water inlet flap valve is unable to the problem of quick closedown.
At the docking of main flap valve and main flap valve seat, and decompression flap valve door body and decompression flap valve seat dock place, all pacify
Equipped with hermetic seal rubber.It is the not tight problem of sealing eliminated flap valve and generated with gate seat manufacturing tolerance that it, which is acted on, and the two is made to connect
Contacting surface more tightly reaches water-stagnating effect.
Main flap valve is hinged with main flap valve seat（As shown in 12 in attached drawing）And main flap valve is hinged with decompression flap valve door body
（As shown in 13 in attached drawing）, all use the articulated manner of axle sleeve and axis.Its effect is to join flap valve and the movable mode of gate seat
Knot gets up.
Operation principle and process：
1, when main flap valve and decompression flap valve are closed when needing to open flap valve：Start digital control system, hydraulic cylinder
It is protruding, push the left end of lifting lever to move upwards, and force effect is being depressurized flap valve door body by steel wire rope.Due to master
Flap valve area is larger and depressurizes the pressure for the water that the area of flap valve door body is smaller, is subject in decompression flap valve door body and is less than on main flap valve
Therefore the pressure for the water being subject to when depressurizing flap valve door body by the upward smaller pulling force effect of steel wire rope, depressurizes flap valve door body
It is first pulled and is gradually opened upwards centered on depressurizing flap valve seat hinged place, main flap valve is motionless, and water body is clapped from the decompression of unlatching
It is flowed in back side and charged pressure pipeline from the upstream face of flap valve in door through-hole, decompression flap valve door body, which continues up rotation, to be made to subtract
Pressure flap valve door body is transmitted to digital control system close to the limit concurrent out position signal of gusset, under the control of digital control system, waits for main flap valve
When upstream face and equal or of substantially equal backwater surface pressure, digital control system be connected to pressure difference be zero-signal, control hydraulic cylinder after
It is continuous to stretch out, so that decompression flap valve door body is close to limit gusset completely.At this point, being limited by limit gusset, flap valve door is depressurized
Body can not be rotated individually again, and the pulling force of steel wire rope acts on main flap valve by depressurizing flap valve door body, and main flap valve upstream face and the back of the body
The pressure of the water surface is equal or of substantially equal, and main flap valve has been no longer influenced by the immense pressure of water body, and therefore, steel wire rope is lifted by crane and set
It is standby main flap valve to be pulled to be rotated up centered on its hinged place with main flap valve seat again by smaller pulling force, to open
Main flap valve is opened, pressure piping water inlet is opened.When reaching flap valve standard-sized sheet, after digital control system is connected to standard-sized sheet signal, hydraulic cylinder
It is stopped.
When using existing common flap valve because lifting appliance to overcome water body act on the immense pressure on flap valve and
The own wt of flap valve, it is therefore desirable to powerful lifting appliance provides powerful pulling force, cause the production cost of equipment with
Operating cost is high, and powerful pulling force is possible to break steel wire rope and cause safety accident.Using the quick flap valve of this decompression type, then
Decompression flap valve is first opened by smaller power, keeps main flap valve upstream face consistent with the pressure of back side, effectively eliminates water body work
With the immense pressure on flap valve, the lifting appliance of low-power need to be only used, the lifting force of slightly above flap valve own wt is provided
The unlatching that flap valve can be realized, not only reduces production and operating cost, is conducive to the flap valve for manufacturing quick closedown, and basic
On can prevent the safety accident caused by wire cable rupture.
2, flap valve is closed under normal circumstances：Under the control of digital control system, the digital control system of numerical control petrol station controls Numerical control valve
Throttle valve is set to carry out throttling control to oil circuit, small oil mass oil circuit control hydraulic cylinder slowly acts, and makes hydraulic cylinder downwards slowly
Retraction, drive the left end of lifting lever slowly to decline, slowly transfer to steel wire rope, main flap valve delays under self gravitation effect
Slow tripping in and final plant closure.After main flap valve is closed, hydraulic cylinder continues slowly retraction downwards, and decompression flap valve starts slowly downwards
Mobile and final extremely fully closed, hydraulic cylinder is stopped, and entire flap valve is closed.Under normal circumstances, throttle valve is to oil
Road carries out throttling control, and small oil mass oil circuit control hydraulic cylinder slowly acts, and flap valve is driven slowly to open and close.
3, flap valve is closed in the case of emergency episode：Water turbine set governor and inlet valve be out of control or thing occurs for pressure piping
Therefore in the case of needing emergency shutdown, digital control system is connected to urgent barrier gate order, and Numerical control valve makes throttle valve bypass, and throttle valve is to oil
Road is not throttled control, and big oil mass oil circuit controls hydraulic cylinder quick acting, so that hydraulic cylinder is quickly moved down, main flap valve
Rapid to close, the also quick closedown after the closing of main flap valve of decompression flap valve, due to main flap valve quick closedown, generated water hangs down pressure
The return water of generation puts back to pond from decompression flap valve, and the born water of pipe that has the function that ease off the pressure is vertical to force power, due to hydraulic oil
Cylinder continuation quickly moves down, and decompression flap valve is also fully closed, and after digital control system is connected to the signal of closed positions, hydraulic cylinder is stopped.
Which prevent the generations of accident, can at least mitigate the extent of damage of accident significantly.
During specific implementation, in order to reach optimal effect of easing stress, the decompression installed on the main flap valve
The quantity of flap valve, can be one or it is equally distributed two or more, the quantity for depressurizing flap valve can be according to the depth of water
Etc. data be determined.Each decompression flap valve is connect by steel wire rope with lifting appliance and equipped with the limit for playing position-limiting action
Gusset.
Claims (6)
1. the quick flap valve of decompression type includes mainly the main flap valve seat mounted on pressure piping water inlet surrounding, is hingedly mounted on master
Main flap valve on flap valve seat, and to lift by crane the lifting appliance of main flap valve, it is characterised in that：It is also installed on the main flap valve
There is decompression flap valve, and play the limit gusset of position-limiting action to decompression flap valve open position, the decompression flap valve is mainly by opening
Through-hole on main flap valve, be mounted on through-hole surrounding decompression flap valve seat, be hinged on decompression flap valve seat on and can with depressurize flap valve
The decompression flap valve door body that seat fits closely is constituted, and the limit gusset is installed on main flap valve, depressurizes the rear of flap valve door body,
The lifting appliance is hydraulic hoisting equipment, mainly by support base, lifting lever, hydraulic cylinder, steel wire rope, and is carried
The numerical control petrol station of throttle valve and Numerical control valve is constituted, and lifting lever is hingedly mounted on support base, hydraulic cylinder and lifting lever
One end of articulated connection, steel wire rope is connect with lifting lever, and the other end is connect with decompression flap valve door body.
2. the quick flap valve of decompression type according to claim 1, it is characterised in that:It is described limit gusset quantity be two pieces or
Equally distributed polylith.
3. the quick flap valve of decompression type according to claim 1, it is characterised in that:The main flap valve is docked with main flap valve seat
Place, and decompression flap valve door body dock place with decompression flap valve seat, are fitted with hermetic seal rubber.
4. the quick flap valve of decompression type according to claim 1, it is characterised in that:The hinge of the main flap valve and main flap valve seat
It connects and main flap valve is hinged with decompression flap valve door body, all use the articulated manner of axle sleeve and axis.
5. the quick flap valve of decompression type according to claim 1, it is characterised in that:The numerical control petrol station is mainly by numerical control system
System, Numerical control valve, throttle valve, oil storage tank composition.
6. the quick flap valve of decompression type according to claim 1, it is characterised in that:The decompression installed on the main flap valve is clapped
The quantity of door be one or it is equally distributed two or more, each flap valve that depressurizes is set by steel wire rope and lifting
Standby connection, and each decompression flap valve is equipped with limit gusset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820062525.1U CN207750541U (en) | 2018-01-15 | 2018-01-15 | The quick flap valve of decompression type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820062525.1U CN207750541U (en) | 2018-01-15 | 2018-01-15 | The quick flap valve of decompression type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207750541U true CN207750541U (en) | 2018-08-21 |
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ID=63153076
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820062525.1U Active CN207750541U (en) | 2018-01-15 | 2018-01-15 | The quick flap valve of decompression type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240490A (en) * | 2018-01-15 | 2018-07-03 | 湖南三乐水电设备研发有限责任公司 | The quick flap valve of decompression type |
-
2018
- 2018-01-15 CN CN201820062525.1U patent/CN207750541U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240490A (en) * | 2018-01-15 | 2018-07-03 | 湖南三乐水电设备研发有限责任公司 | The quick flap valve of decompression type |
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