CN207634709U - A kind of gradual change type valve and gradual change type siphon destructive valve - Google Patents
A kind of gradual change type valve and gradual change type siphon destructive valve Download PDFInfo
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- CN207634709U CN207634709U CN201721781740.9U CN201721781740U CN207634709U CN 207634709 U CN207634709 U CN 207634709U CN 201721781740 U CN201721781740 U CN 201721781740U CN 207634709 U CN207634709 U CN 207634709U
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- 230000008859 change Effects 0.000 title claims abstract description 87
- 230000001066 destructive effect Effects 0.000 title claims abstract description 53
- 230000003519 ventilatory effect Effects 0.000 claims abstract description 45
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 91
- 230000003068 static effect Effects 0.000 claims description 41
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 description 15
- 230000006378 damage Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000010992 reflux Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000003570 air Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 230000029058 respiratory gaseous exchange Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000007306 functionalization reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002498 deadly effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Fluid-Driven Valves (AREA)
Abstract
The utility model discloses a kind of gradual change type valve and gradual change type siphon destructive valve, gradual change type valve includes：The normally opened valve of the air chamber and atmospheric environment of siphon destructive valve is connected；First valve；And selection mechanism；Selection mechanism controls the working condition of the first valve, to adjust the ventilatory capacity between air chamber and atmospheric environment.The gradual change type valve of the utility model can voluntarily adjust the working condition of itself according to the working condition of pump group, to meet the needs of under pump group different working condition, to optimize the working condition of pump group, improve the operational efficiency of pump group, improve the running stability of pump group, it reduces the operation noise of pump group, improve the service life of pump group, there are good practicability, applicability and market prospects.
Description
Technical field
The utility model is related to siphon destructive technical field, espespecially a kind of gradual change type valve and gradual change type siphon destructive valve.
Background technology
Power station, shipyard pumping station, Urban Waterlogging pumping plant, wastewater disposition pumping plant, heat power station etc. use Siphoning type pipe
Water pump assembly shut down in normal operation or when accidental shutdown, institute is showed using siphon destructive valve to destroy the siphon in pipeline
As making moisture stream water-break in pipeline, meeting host groups can steadily shut down in time.If siphon destructive valve cannot in time certainly when shutting down
It is dynamic to open valve to destroy siphonage, cause high water level aqueous reflux to make water pump assembly that will exceed the speed limit reversing, or even cause impeller
Fly anecdote event, therefore siphon destructive valve is one of protection pumping plant safe operation important equipment.
Present home and overseas Siphoning type pipe large pumping station uses traditional pneumatic, mechanical false paddle, electro-hydraulic control substantially
Formula, support oneself siphon destructive valves, the structure such as differential are all closed type valves, and there are one deadly defects, and it is outer to shut down valve opening needs
Power source and other pressure sources are set to open valve plate, destroy siphonage in pipeline.This kind of valve is needed if there is failure
Operating personnel go to on-site manual Open valve, cannot meet rapid damage siphonage function in time.Above-mentioned this kind of valve
Door should be normally closed structure design all without degassing function, and if any the valve of function of band exhaust, when water pump plays pump, needs are very
It can be vented again after the open-top flap weight of big air-flow, increase water pump engine base unstability and pipe vibration in this way.Longtime running meeting
Reduce the service life of unit.
Present part large pumping station due to geographical location limitation, cause siphon piping hump point super from water pump host with a distance from
Long, the height of water is bigger, increase under such working condition water capacity accumulated amount in siphon piping born more than water pump assembly it is specified
Water flow is exceeded, and it is excessive to occur huge water hammer pressure when dividing aqueous reflux, can cause the unit vibrations rate and pump shaft displacement to be more than
Pump technology index causes very fatal phenomenon to pumping plant unit use.
Therefore, the application is dedicated to providing a kind of gradual change type valve and gradual change type siphon destructive valve.
Invention content
The purpose of this utility model is to provide a kind of gradual change type valve and gradual change type siphon destructive valve, can be according to the work of pump group
State voluntarily adjusts the working condition of itself, to meet the needs of under pump group different working condition, to optimize the work of pump group
Make state, improve the operational efficiency of pump group, improve the running stability of pump group, reduces the operation noise of pump group, improves pump group
Service life, have good practicability, applicability and market prospects.
The technical scheme that the utility model is provided is as follows：
A kind of gradual change type valve suitable for siphon destructive valve, including：
The air chamber of the siphon destructive valve and the normally opened valve of atmospheric environment is connected；
First valve；And
Selection mechanism；
The selection mechanism controls the working condition of first valve, to adjust between the air chamber and atmospheric environment
Ventilatory capacity.
In the technical program, the working condition of the first valve is selectively controlled by selection mechanism, so as to adjust siphon
Ventilatory capacity between the air chamber and atmospheric environment of destructive valve, to meet the different working condition that siphon destructive valve corresponds to pump group
Under Siphoning type pipe in pressure demand, such as when pump group is in running order, needed in pipeline at this time be in siphon state,
Water cavity and air chamber are closed state at this time, then at this point, air chamber need to only be communicated with atmospheric environment；It is shut down when pump group is in
When shutdown or accidental shutdown, at this time it is required that being connected to water cavity in atmospheric environment, that is, needs air chamber to be communicated with water cavity, is empty
Air cavity is communicated with atmospheric environment, in time destroy pipeline in siphonage, due to this gradual change type valve can adjust air chamber with
The ventilatory capacity of atmospheric environment, so as to stage control into the air of water cavity, to realize the stage air inlet of water cavity,
The destruction for making the siphonage in pipeline stage needs a large amount of air to enter water cavity when just starting, and control at this time enters
The air capacity of water cavity is more, and to the siphonage of rapid damage part, then, the ventilatory capacity by control into water cavity is few
Some, to slowly destroy remaining siphonage, to ensure that the stationarity of the shutdown of pump group (is reduced because of high water level aqueous reflux
So that pump group hypervelocity is reversed, impeller even caused to fly ease accident phenomenon), reduce pipe vibration and pump shaft offset phenomena so that after
Continuous uniform fluid flow is flow backwards at a slow speed without will produce water hammer, to eliminate serious consequence that water hammer brings (pump group vibrations rate and
Pump shaft displacement is more than pump technology index, and very fatal phenomenon is caused to pumping plant unit use), drastically reduce termination of pumping valve opening
When generated negative pressure noise amount in decibels, improve the service life of pump group；When pump group is in booting, due to normally opened valve
Setting so that water, air, water mist mixture in pipeline can be largely exhausted by normally open valve, when reducing pump group booting
Vibrations and pipeline compression shock, vibrations, improve pump group booting stability and its service life.This gradual change type valve can root
The working condition that itself is voluntarily adjusted according to the working condition of pump group, to meet the needs of under pump group different working condition, to
The working condition for optimizing pump group, improves the operational efficiency of pump group, improves the running stability of pump group, the operation for reducing pump group is made an uproar
Sound, the service life for improving pump group have good practicability, applicability and market prospects.
It is further preferred that the ventilatory capacity of the normally opened valve is more than the ventilatory capacity of first valve；The normally open valve
The air chamber is connected with after atmospheric environment to preset time in door, and the selection mechanism controls the normally opened valve and closes the sky
The air chamber and atmospheric environment is connected with atmospheric environment, first valve in air cavity.
In the technical program, normally opened valve ventilatory capacity is more than the ventilatory capacity of the first valve so that this gradual change type valve is in pump group
When in running order (i.e. siphon state), normally open valve work, but be then normally opened first when pump group is in shutdown status
Valve conducting air chamber and atmospheric environment (the first valve is in folding condition or closed state at this time), subsequently then only by the first valve
Door work and normally opened valve be in closed state, to which the stage of water cavity when realizing pump group shutdown reduces air inflow, make
Obtain the stage destruction of the siphonage in pipeline needs a large amount of air to enter water cavity when just starting, and control at this time enters water
The air capacity of chamber is more, to the siphonage of rapid damage part, then, the ventilatory capacity few one of water cavity is entered by control
A bit, to slowly destroy remaining siphonage, to ensure that the stationarity of the shutdown of pump group (is reduced because high water level aqueous reflux makes
Pump group hypervelocity reverses, impeller is even caused to fly ease accident phenomenon), reduce pipe vibration and pump shaft offset phenomena so that follow-up
Uniform fluid flow flow backwards at a slow speed without will produce water hammer, to eliminate serious consequence (pump group vibrations rate and the pump that water hammer is brought
Axial displacement is more than pump technology index, and very fatal phenomenon is caused to pumping plant unit use), when drastically reducing termination of pumping valve opening
Generated negative pressure noise amount in decibels, improves the service life of pump group.
It is further preferred that further including the valve seat for being installed on the siphon destructive valve, the normally opened valve and the valve seat
It is adapted；The normally opened valve is equipped with the first venthole that the air chamber and atmospheric environment is connected；First valve is set to
For the normally opened valve close to the side of atmospheric environment, the position that first valve corresponds to first venthole is logical equipped with second
Stomata；The size of first venthole is more than the size of the second venthole；The selection mechanism drives first valve remote
From or the fitting normally opened valve.
In the technical program, the folded design of the first valve and normally opened valve so that the structure of this gradual change type valve is more tight
It gathers, easily realize.And when only normally opened valve is on air chamber and atmospheric environment, then the first valve is far from normally opened valve,
When only the first valve conducting air chamber and atmospheric environment, then the first valve is bonded normally opened valve, due to the first venthole
The size of the second venthole of size ratio is big, therefore, when the first valve is bonded normally opened valve, communicated at this time with the second venthole the
One through-hole plays the role of conducting, and the ventilatory capacity of air chamber and atmospheric environment is determined by the size of the second venthole, to realize
The staged of water cavity air inflow reduces air inflow.
It is further preferred that the selection mechanism includes the DYNAMIC MAGNETIC part being connect with first valve and separate
The static magnetic part of the first valve setting；When the DYNAMIC MAGNETIC part is in attracting state with the static magnetic part, institute
It states normally opened valve and is on the air chamber and atmospheric environment state, first valve is in closed state；The dynamic
When magnetic part is in discrete state with the static magnetic part, first valve is on the air chamber and atmospheric environment
State, the normally opened valve are in closed state.
In the technical program, the working condition of the first valve is determined by two magnetic parts that mutually can be attracted or detach
Fixed, action is safe and reliable, at low cost, is easily achieved.
It is further preferred that the selection mechanism further includes mounting plate, the first connector and the second connector；Described first
After connector runs through the normally opened valve, both ends are connect with the valve seat and the mounting plate respectively；Second connector
After first valve, both ends are connect with the valve seat and the mounting plate respectively；The mounting plate is close to the valve
The surface of seat side is equipped with the static magnetic part；First valve is equipped with described close to the surface of the mounting plate side
DYNAMIC MAGNETIC part.
In the technical program, connector (i.e. the first connector and the second connector), which not only acts as, is linked to be this gradual change type valve
The effect of one, to realize the modularization, functionalization, blocking of this gradual change type valve；Also have the function of limit, be oriented to, makes
Obtain normally opened valve, the first valve can move reciprocatingly along its extension direction, and then realize diversified, more work(of this gradual change type valve
Can, with pump group working condition need voluntarily adjust the working condition of its own, to optimize the working condition of pump group, and protect
Pump group is protected, its service life is extended.
It is further preferred that first connector is equipped with limit protrusion close to the end of the mounting plate side；With/
Or, the static magnetic part is installed on the mounting plate by mounting base；The mounting base is equipped with pilot hole so that is moved with described
The guide post of state magnetic part connection moves reciprocatingly in the pilot hole.
In the technical program, the setting of limit protrusion limits the upward stroke of normally opened valve so that air chamber with
The ventilatory capacity of atmospheric environment has upper limit value and lower limiting value；More preferably, moreover it is possible to protect the second valve, avoid the second valve because normally opened
Valve excessively rises and the static magnetic part of appearance and colliding for DYNAMIC MAGNETIC part, to ensure that this gradual change type valve
Good operational effect extends the service life of this gradual change type valve.
In the technical program, in order to ensure stability and the direction of DYNAMIC MAGNETIC part and the actuation of static magnetic part or separation
Property, it is limited and is positioned by matched pilot hole and guide post.
It is further preferred that the selection mechanism further includes the first PLC control system being connect with the DYNAMIC MAGNETIC part.
In the technical program, DYNAMIC MAGNETIC part and the actuation of static magnetic part are controlled by PLC control system or detached,
When DYNAMIC MAGNETIC part needs to be attracted with static magnetic part, PLC control system makes DYNAMIC MAGNETIC part be powered, so that dynamic
Magnetic part can be attracting with static magnetic part and be attracted；When DYNAMIC MAGNETIC part needs are detached with static magnetic part, PLC controls system
System is so that DYNAMIC MAGNETIC part powers off, so that DYNAMIC MAGNETIC part detaches due to losing magnetism with static magnetic part.To realize
It is broken with the siphon of this gradual change type to substantially reduce pump group for the self regulating and control of intelligence, the automation of this gradual change type siphon destructive valve
Response time between bad valve greatly improves linkage and harmony between pump group and this gradual change type siphon destructive valve.
The utility model additionally provides a kind of gradual change type siphon destructive valve, including：
Valve body, the valve body are equipped with water cavity and air chamber；
The second valve for being connected or closing the water cavity and the air chamber；And
Gradual change type valve described in above-mentioned any one.
In the technical program, the working condition of the first valve is selectively controlled by selection mechanism, gradually so as to adjust this
Ventilatory capacity between the air chamber and atmospheric environment of variant siphon destructive valve, to meet this gradual change type siphon destructive valve respective pump
The pressure demand in Siphoning type pipe under the different working condition of group, such as when pump group is in running order, at this time in pipeline
It needs to be in siphon state, water cavity and air chamber are closed state at this time, then at this point, air chamber need to only communicate i.e. with atmospheric environment
It can；When pump group, which is in, shuts down shutdown or accidental shutdown, at this time it is required that being connected to water cavity in atmospheric environment, that is, sky is needed
Air cavity is communicated with water cavity, air chamber is communicated with atmospheric environment, to destroy siphonage in pipeline in time, due to this gradual change type valve
Air chamber and the ventilatory capacity of atmospheric environment can be adjusted, so as to stage control into the air of water cavity, to realize
The stage air inlet of water cavity so that the stage destruction of siphonage in pipeline when just starting, needs a large amount of air to enter
Water cavity, the air capacity of control into water cavity is more at this time, then passes through control to the siphonage of rapid damage part
Ventilatory capacity into water cavity is few, to slowly destroy remaining siphonage, to ensure pump group shutdown stationarity
(reduce because high water level aqueous reflux make pump group hypervelocity reverse, even cause impeller fly ease accident phenomenon), reduce pipe vibration and
Pump shaft offset phenomena so that subsequent uniform fluid flow is flow backwards at a slow speed without will produce water hammer, to eliminate water hammer bring it is tight
Weight consequence (pump group vibrations rate and pump shaft displacement cause very fatal phenomenon more than pump technology index to pumping plant unit use),
Generated negative pressure noise amount in decibels when termination of pumping valve opening is drastically reduced, the service life of pump group is improved；When pump group is in
When booting, due to the setting of normally opened valve so that water, air, water mist mixture in pipeline can by normally open valve largely into
Row exhaust reduces vibrations when pump group booting and the compression shock of pipeline, vibrations, improves the stability of pump group booting and its makes
Use the service life.This gradual change type siphon destructive valve can voluntarily adjust the working condition of itself according to the working condition of pump group, to meet
Demand under pump group different working condition improves the operational efficiency of pump group, improves pump group to optimize the working condition of pump group
Running stability reduces the operation noise of pump group, improves the service life of pump group, have good practicability, applicability and
Market prospects.
It is further preferred that the pressure sensor of the pressure value for monitoring the water chamber air；2nd PLC controls system
System；And the electromagnetic driven component for opening and closing second valve；Second PLC control system respectively with the electromagnetism
Transmission component, pressure sensor connection.
In the technical program, when pump group is in shutdown status, when being in not operating status due to pump group certain time, pump
Air pressure value (negative pressure) in pipeline in group can change, and influence pump group in order to avoid the vacuum degree in pipeline is excessive
Operation, reduce atmospheric environment to the pressure load of pipeline, protection pump group, the usage time for extending pump group, pass through PLC controls system
System and pressure sensor voluntarily adjust atmospheric pressure (conducting or closed water cavity and the air of the water cavity of the pump group of this state
Chamber) so that the air pressure value stabilization in water cavity is in a certain range.More preferably, PLC can also be according to the work shape of pump group
State controls the working condition of this gradual change type siphon destructive valve, to improving the harmony of this gradual change type siphon destructive valve and pump group
And conformability.
It is further preferred that further including the man-operated mechanism for opening and closing second valve；And/or the 2nd PLC controls
System processed is same control system with the first PLC control system.
In the technical program, in order to avoid emergency (such as electromagnetic driven component operation failure, emergency) presence,
Staff can also manually be connected or closed water cavity and air chamber.
In the technical program, the second PLC control system can be a PLC control system with the first PLC control system, to
Simplify the structure and control system of this gradual change type siphon destructive valve.
A kind of gradual change type valve and gradual change type siphon destructive valve provided by the utility model, can bring following at least one to have
Beneficial effect：
1, in the utility model, this gradual change type valve (or gradual change type siphon destructive valve) can be according to the working condition of pump group voluntarily
The working condition for adjusting itself, to optimize the working condition of pump group, carries to meet the needs of under pump group different working condition
The operational efficiency of high pump group improves the running stability of pump group, the use longevity for reducing the operation noise of pump group, improving pump group
Life has good practicability, applicability and market prospects.
2, in the utility model, the folded design of the first valve and normally opened valve so that the structure of this gradual change type valve is more
Compact, easy realization.And when only normally opened valve is on air chamber and atmospheric environment, then the first valve is far from normally open valve
Door, when only the first valve conducting air chamber and atmospheric environment, then the first valve is bonded normally opened valve, due to the first venthole
The second venthole of size ratio size it is big, therefore, the first valve be bonded normally opened valve when, communicated at this time with the second venthole
First through hole plays the role of conducting, and the ventilatory capacity of air chamber and atmospheric environment is determined by the size of the second venthole, to realize
The staged of water cavity air inflow reduces air inflow.
3, in the utility model, connector (i.e. the first connector and the second connector), which not only acts as, connects this gradual change type valve
Integral effect, to realize the modularization, functionalization, blocking of this gradual change type valve；Also have the function of limit, be oriented to,
So that normally opened valve, the first valve can move reciprocatingly along its extension direction, and then realize diversified, more work(of this gradual change type valve
Can, with pump group working condition need voluntarily adjust the working condition of its own, to optimize the working condition of pump group, and protect
Pump group is protected, its service life is extended.
4, in the utility model, the setting of limit protrusion limits the upward stroke of normally opened valve, so that air chamber
There is upper limit value and lower limiting value with the ventilatory capacity of atmospheric environment；More preferably, moreover it is possible to protect the second valve, avoid the second valve because often
Valve opening door excessively rises and the static magnetic part of appearance and colliding for DYNAMIC MAGNETIC part, to ensure that this gradual change type valve
Good operational effect, extend the service life of this gradual change type valve.More preferably, in order to ensure DYNAMIC MAGNETIC part and static-magnetic
Property part be attracted or separation stability and directionality, limited and positioned by matched pilot hole and guide post.
5, in the utility model, the actuation of DYNAMIC MAGNETIC part and static magnetic part is controlled by PLC control system or is divided
From, to realize this gradual change type siphon destructive valve intelligence, automation self regulating and control, substantially reduce pump group with this gradually
Response time between variant valve (or gradual change type siphon destructive valve), greatly improve the linkage between pump group and this gradual change type valve
And harmony.More preferably, PLC control system can also realize this gradual change type rainbow by controlling the working condition of electromagnetic driven component
Inhale destructive valve water cavity and air chamber between conducting or closing, to ensure realize gradual change type siphon destructive valve intelligence,
Automation adjustment, and then avoid the vacuum degree in pipeline excessive and influence the operation of pump group, reduce atmospheric environment to the pressure of pipeline
Power load, protection pump group, the usage time for extending pump group.
Description of the drawings
Below by a manner of clearly understandable, preferred embodiment is described with reference to the drawings, to gradual change type valve and gradual change type rainbow
Above-mentioned characteristic, technical characteristic, advantage and its realization method for inhaling destructive valve are further described.
Fig. 1 is structural schematic diagram when a kind of embodiment of the gradual change type valve of the utility model is in the first working condition；
Fig. 2 is the section figure structure schematic representation of Fig. 1；
Fig. 3 is structural schematic diagram when gradual change type valve in Fig. 1 is in the second working condition；
Fig. 4 is the section figure structure schematic representation of Fig. 3；
Fig. 5 is a kind of example structure schematic diagram of the normally opened valve of the utility model；
Fig. 6 is a kind of example structure schematic diagram of first valve of the utility model；
Fig. 7 is a kind of example structure schematic diagram of the gradual change type siphon destructive valve of the utility model.
Drawing reference numeral explanation：
1. gradual change type valve, 11. normally opened valves, 111. first connecting holes, 112. first ventholes, 12. first valves, 121.
Second connecting hole, 122. second ventholes, 13. selection mechanisms, 131. DYNAMIC MAGNETIC parts, 132. static magnetic parts, 133. installations
Plate, 134. first connectors, 1341. limit protrusions, 135. second connectors, 136. third connectors, 137. mounting bases,
1371. pilot holes, 138. guide posts, 14. valve seats, 15. dustproof covers, 16. Air Filters, 17. buffer gears, 171. first springs,
172. inverted T shaped support set portion, 2. valve bodies, 21. water cavities, 22. air chambers, 3. second valves, 31. valve plates, 32. second valve seats, 33. valves
Bar, 34. second springs, 4. electromagnetic driven components, 5. pressure sensors, 6.PLC control systems, 7. man-operated mechanisms.
Specific implementation mode
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, attached drawing will be compareed below
Illustrate specific embodiment of the present utility model.It should be evident that the accompanying drawings in the following description is only the one of the utility model
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings, and obtains other embodiments.
To make simplified form, in each figure only schematically show with the relevant part of the utility model, they are simultaneously
Its practical structures as product is not represented.In addition, so that simplified form is easy to understand, have in some figures identical structure or
The component of function, only symbolically depicts one of those, or has only marked one of those.Herein, "one" is not
It only indicates " only this ", can also indicate the situation of " more than one ".Herein, it should be noted that unless otherwise bright
True regulation and restriction, term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, also may be used
To be to be detachably connected, or be integrally connected；It can be mechanical connection, can also be electrical connection；It can be directly connected, also may be used
Indirectly connected through an intermediary, can be the connection inside two elements.For the ordinary skill in the art,
The concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
In embodiment one, as shown in figs. 1-7, a kind of gradual change type valve suitable for siphon destructive valve, including：Siphon is connected
The air chamber 22 of destructive valve and the normally opened valve 11 of atmospheric environment；First valve 12；And selection mechanism 13；Selection mechanism 13
The working condition for controlling the first valve 12, to adjust the ventilatory capacity between air chamber 22 and atmospheric environment.In practical applications, originally
Gradual change type valve 1 can voluntarily adjust the working condition of itself according to the working condition of pump group, to meet pump group different working condition
Under demand, to automate optimization pump group working condition, improve the operational efficiency of pump group, improve operating steadily for pump group
Property, it reduces the operation noise of pump group, improve the service life of pump group, there are good practicability, applicability and market prospects.
It when pump group is in running order, needs to be in siphon state at this time in pipeline, water cavity 21 and air chamber 22 are closed at this time
State, then at this point, air chamber 22 need to only be communicated with atmospheric environment；When pump group, which is in, shuts down shutdown or accidental shutdown, this
When it is required that be connected to water cavity 21 in atmospheric environment, that is, need air chamber 22 to be communicated with water cavity 21, air chamber 22 and big compression ring
Border communicates, to destroy siphonage in pipeline in time, since this gradual change type valve 1 can adjust air chamber 22 and atmospheric environment
Ventilatory capacity, so as to stage control into the air of water cavity 21, when to realize that pump group is shut down (or (gradual change type) siphon
When destructive valve starts) the stage reduction of the air inflow of water cavity 21 so that the stage destruction of siphonage in pipeline is just opened
When the beginning, a large amount of air is needed to enter water cavity 21, the air capacity of control into water cavity 21 is more at this time, to rapid damage portion
The siphonage divided, then, the ventilatory capacity by control into water cavity 21 are few, show to slowly destroy remaining siphon
As, to ensure pump group shutdown stationarity (reduce because high water level aqueous reflux make pump group hypervelocity reverse, even cause impeller fly
Escape accident phenomenon), reduce pipe vibration and pump shaft offset phenomena so that subsequent uniform fluid flow is flow backwards at a slow speed without will produce
Water hammer, to eliminate serious consequence that water hammer brings, (pump group vibrations rate and pump shaft displacement are more than pump technology index, to pumping plant
Unit use causes very fatal phenomenon), generated negative pressure noise amount in decibels when termination of pumping valve opening is drastically reduced, is improved
The service life of pump group；When pump group is in booting, due to the setting of normally opened valve 11 so that water, air, water mist in pipeline
Mixture can be largely exhausted by normally open valve, reduce vibrations when pump group booting and the compression shock of pipeline, vibrations,
Improve the stability and its service life of pump group booting.
In embodiment two, as shown in figs. 1-7, on the basis of embodiment one, the ventilatory capacity of normally opened valve 11 is more than the
The ventilatory capacity of one valve 12；With after atmospheric environment to preset time, selection mechanism 13 controls 11 conducting air chamber 22 of normally opened valve
11 occluded air chamber 22 of normally opened valve and atmospheric environment, 12 conducting air chamber 22 of the first valve and atmospheric environment.In practical application
In, when normally opened valve 11 is on air chamber 22 and atmospheric environment, the first valve 12 also can conducting air chamber 22 and air
Environment, at this moment, the ventilatory capacity between atmospheric environment and air chamber 22 are the ventilatory capacity summation of normally opened valve 11 and the first valve 12；
Certainly, the first valve 12 can also be in closed, and at this moment, the ventilatory capacity between atmospheric environment and air chamber 22 is only then normally open valve
The ventilatory capacity of door 11；When needing to reduce the ventilatory capacity between atmospheric environment and air chamber 22, then 11 work of normally opened valve is only needed
Make or the first valve 12 is only needed to work, but the scope of protection of the utility model should be belonged to.Here the value of preset time is excellent
The arbitrary value being selected as between the 3-20s after this group is shut down
In embodiment three, as shown in figs. 1-7, on the basis of embodiment one or two, in order to simplify this gradual change type valve 1
Structure reduces its space occupancy rate and production cost.The 12 preferably integrated design of normally opened valve 11 and the first valve, i.e., originally gradually
Variant valve 1 further includes the valve seat 14 for being installed on siphon destructive valve (i.e. this gradual change type siphon destructive valve), normally opened valve 11 and valve seat
14 are adapted；Normally opened valve 11 is equipped with the first venthole 112 of conducting air chamber 22 and atmospheric environment；First valve 12 is set to normal
For valve opening door 11 close to the side of atmospheric environment, the position that the first valve 12 corresponds to the first venthole 112 is equipped with the second venthole
122；The size of first venthole 112 is more than the size of the second venthole 122；The first valve 12 of driving of selection mechanism 13 it is separate or
It is bonded normally opened valve 11.The working method of gradual change type valve 1 in the present embodiment is that normally opened valve 11 is constantly in conducting air chamber
22 and atmospheric environment working condition in, i.e., the ventilatory capacity of air chamber 22 and atmospheric environment is that the ventilation of the first venthole 112 is total
With, until the first valve 12 be bonded normally opened valve 11, at this moment, due to the first venthole 112 size be more than the second venthole 122
Size, and the first valve 12 is folded is located at surface of the normally opened valve 11 close to atmospheric environment side so that the first ventilation of part
The first valve 12 of 112, hole blocks and cannot achieve conducting effect, at this point, air chamber 22 and the ventilatory capacity of atmospheric environment are then
Therefore the ventilation summation of second venthole 122 (is in and leads when the first valve 12 is on atmospheric environment and air chamber 22
Logical working condition) when, the first venthole 112 only serves the effect in channel, without playing the role of valve (i.e. at normally opened valve 11
In closed state).
Preferably, the quantity of the first venthole 112 is at least one, and the quantity of the second venthole 122 is also at least one,
And size (or breathing area) here refers to the size (or breathing area) and all of the first all ventholes 112
The size (or breathing area) of two ventholes 122, and the quantity of the first venthole 112 and the second venthole 122 can be one a pair of
The relationship or one-to-many, many-to-one quantitative relation answered, are configured, just do not repeat one by one here according to actual needs.
In example IV, as shown in figs. 1-7, on the basis of embodiment three, selection mechanism 13 includes and the first valve
The DYNAMIC MAGNETIC part 131 of 12 connections and the static magnetic part 132 far from the setting of the first valve 12；DYNAMIC MAGNETIC part 131 with it is quiet
When state magnetic part 132 is in attracting state, normally opened valve 11 is on air chamber 22 and atmospheric environment state, the first valve 12
In closed state；When DYNAMIC MAGNETIC part 131 is in discrete state with static magnetic part 132, the first valve 12 is on sky
Air cavity 22 and atmospheric environment state, normally opened valve 11 are in closed state.Preferably, selection mechanism 13 further include mounting plate 133,
First connector 134 and the second connector 135；After first connector 134 runs through the first connecting hole 111 of normally opened valve 11,
Both ends are connect with valve seat 14 and mounting plate 133 respectively；After second connector 135 runs through the second connecting hole 121 of the first valve 12,
Its both ends is connect with valve seat 14 and mounting plate 133 respectively；Mounting plate 133 is equipped with static magnetic close to the surface of 14 side of valve seat
Part 132；First valve 12 is equipped with DYNAMIC MAGNETIC part 131 close to the surface of 133 side of mounting plate.Preferably, selection mechanism 13 is gone back
It include the first PLC control system (i.e. PLC control system 6) being connect with DYNAMIC MAGNETIC part 131.First PLC control system passes through
The energization or power-off for controlling DYNAMIC MAGNETIC part 131, to realize the actuation of DYNAMIC MAGNETIC part 131 and static magnetic part 132 or divide
From.Control the actuation or separation of DYNAMIC MAGNETIC part 131 and static magnetic part 132 in this manner, action is accurate, will not produce
Raw maloperation (as when DYNAMIC MAGNETIC part 131 and static magnetic part 132 in the case that DYNAMIC MAGNETIC part 131 is cold also can be because
Magnetic attraction and with static magnetic part 132 be attracted, to maloperation occur)；Certainly, the first PLC control system also can be with static-magnetic
Property part 132 connect, by control static magnetic part 132 energization or power-off, to realize DYNAMIC MAGNETIC part 131 and static magnetic
The actuation or separation of part 132.It is worth noting that the first valve 12 conducting atmospheric environment and the working condition of water cavity 21 are preferably only
Occur in pump group stopping process, closed state (i.e. static magnetic part is in pump group start process and non-operating status
132 and DYNAMIC MAGNETIC part 131 be in attracting state), only normally opened valve 11 is in the conduction state.
In practical applications, it also can also be driven by its driving mechanism (such as motor or cylinder) by selection mechanism 13
It moves the actuation between DYNAMIC MAGNETIC part 131 and static magnetic part 132 or detaches, then at this point, since DYNAMIC MAGNETIC part 131 can be obstructed
Electricity and generate with the magnetic opposite magnetism of static magnetic part 132, therefore, DYNAMIC MAGNETIC part 131 at this time can also directly for it is quiet
The magnetic opposite magnetic part of state magnetic part 132.Certainly, selection mechanism 13 can also pass through its driving mechanism (such as motor or cylinder)
To directly drive being bonded between the first valve 12 and normally opened valve 11 or separate.But the protection model of the utility model should be belonged to
Within enclosing.Preferably, there is Air Filter 16 in the outer sheath of this gradual change type valve 1, to effectively avoid the ash in atmospheric environment
Dirt, foreign matter (such as rubbish, dust) enter this gradual change type valve 1 ((gradual change type) siphon destructive valve), to protect magnetic part (dynamic
Magnetic part 131 and static magnetic part 132), pipeline and gradual change type valve 1 ((gradual change type) siphon destructive valve).
In embodiment five, as shown in figs. 1-7, on the basis of embodiment three or four, the lid of normally opened valve 11 is located at valve seat
14 close to the side of the first valve 12, so that can push up normally opened valve 11 when chimneying pressure when pump group is switched on
Go out, to increase the ventilatory capacity of air chamber 22 and atmospheric environment, further decreases the seismism of pump group, opened to improve pump group
Stationarity when machine；More preferably, with the rising of normally opened valve 11, normally opened valve 11 can be done with the first valve 12 close to static state
The work of magnetic part 132, since there is the magnetism opposite with static magnetic part 132 after the energization of DYNAMIC MAGNETIC part 131 at this time, to
So that static magnetic part 132 and DYNAMIC MAGNETIC part 131 are attracting, (it is not turned on so that the first valve 12 is in closed state
Atmospheric environment and air chamber 22, are in off working state), hereafter, with the reduction of chimneying pressure, normally opened valve 11 is at it
Land under the action of gravity, so that the conduction amount of air chamber 22 and atmospheric environment becomes the ventilatory capacity of the first venthole 112,
So that the whole process of pump group booting is being carried out in a more stable air flow pressure, the stationarity of pump group is improved；Meanwhile
First valve 12 is temporarily fixed to the top of normally opened valve 11 by dynamic magnetic part 131 so that pump group in the process of running, air
Ventilatory capacity between chamber 22 and atmospheric environment is limited by the first venthole 112 of normally opened valve 11.When pump group is shut down, first
11 conducting air chamber 22 of normally opened valve (can be configured and supervised by the first PLC control system with atmospheric environment to preset time
Control) after, during this, the ventilatory capacity into water cavity 21 is the ventilatory capacity summation of the first venthole 112；Then the first PLC is controlled
System controls DYNAMIC MAGNETIC part 131 and powers off so that DYNAMIC MAGNETIC part 131 its with it is remote under the gravity of the first valve 12
From static magnetic part 132, then folds and be located at normally opened valve 11 close to the surface of the side of atmospheric environment, so that normally opened valve
11 are in the working condition of closed atmosphere environment and air chamber 22, and the first valve 12 is on atmospheric environment and air chamber 22
Working condition (at this point, the first venthole 112 only serves the effect of flow-guiding channel, i.e., will be flowed by the second venthole 122
Air introduction air chamber 22, and then enter water cavity 21), during this, the ventilatory capacity into water cavity 21 is the second venthole 122
Ventilatory capacity summation.
In embodiment six, as shown in figs. 1-7, on the basis of example IV or five, the first connector 134 is close to installation
The end of 133 side of plate is equipped with limit protrusion 1341；Static magnetic part 132 is installed on mounting plate 133 by mounting base 137；Peace
It fills seat 137 and is equipped with pilot hole 1371 so that the guide post 138 being connect with DYNAMIC MAGNETIC part 131 is reciprocal in being done in pilot hole 1371
Movement.Preferably, further include the dustproof cover 15 for being covered on guide post 138 close to the end of atmospheric environment side, and dustproof cover 15
Inner wall correspond to guide post 138 position be equipped with buffer gear 17, buffer gear 17 include the first spring 171 and it is inverted T shaped support set
Portion 172, and it is inverted T shaped support set portion 172 by the first spring 171 be set to dustproof cover 15 at so that guide post 138 is moving reciprocatingly
When, in order to buffer between DYNAMIC MAGNETIC part 131 and static magnetic part 132 it is attracting during power impact, protect guide post
138, it avoids 138 punching press dustproof cover 15 of guide post and damages, extend the service life of guide post 138.Preferably, valve seat 14 passes through
Third connector 136 is spirally connected with siphon destructive valve (i.e. this gradual change type siphon destructive valve)；Preferably, the first connector 134, second
Connector 135 is respectively spirally connected with mounting plate 133 and valve seat 14, to realize this gradual change type valve 1 blocking, modular group
Dress, installation or removal etc., improve the ease of use of gradual change type valve 1.
In embodiment seven, as shown in figs. 1-7, a kind of gradual change type siphon destructive valve, including：Valve body 2, valve body 2 are equipped with water
Chamber 21 and air chamber 22；For being connected or the second valve 3 of closed water cavity 21 and air chamber 22；And above-mentioned any one institute
The gradual change type valve 1 stated.In practical applications, when pump group is switched on, water cavity 21 and air chamber 22 at this time is in the conduction state, pipe
Water mist mixture in road is connected by normally opened valve 11 with atmospheric environment, to reduce the shake of pump group (including pipeline and pump)
It is dynamic, improve the stability of the operation of pump group；In the process of running, water cavity 21 is in closed state, pipeline to pump group with air chamber 22
In siphon state；When pump group is shut down, water cavity 21 at this time is connected with air chamber 22 so that the air of air chamber 22 quickly into
Enter water cavity 21 and destroy part siphonage, part siphonage is then destroyed by the ventilatory capacity of normally opened valve 11 herein；
Finally, realize that the reduction of ventilatory capacity between water cavity 21 and air chamber 22 controls again by the working condition of the first valve 12.It is excellent
Selection of land can control pump group by the ventilatory capacity of control normally opened valve 11, the first valve 12, the second valve 3 in practical applications
Stage destruction siphon when shutdown；If the ventilatory capacity of the second valve 3 is more than normally opened valve 11, the ventilatory capacity of normally opened valve 11 is big
In the first valve 12, in this way, when the second valve 3, normally opened valve 11, the first valve 12 can realize the three-stage ventilation of siphon destructive
The control of amount；When the second valve 3 is equal with the ventilatory capacity of normally opened valve 11, then the two-part ventilatory capacity of siphon destructive can be achieved
Control.
Further include empty in water cavity 21 for monitoring on the basis of embodiment seven as shown in figs. 1-7 in embodiment eight
The pressure sensor 5 of the pressure value of gas；Second PLC control system (i.e. PLC control system 6)；And for opening and closing the second valve
3 electromagnetic driven component 4；Second PLC control system is connect with electromagnetic driven component 4, pressure sensor 5 respectively.Pressure sensing
Device 5 is preferably provided at the top for the valve body 2 to form water cavity 21, and the second PLC control system is by controlling the logical of electromagnetic driven component 4
Electricity or power-off, to control the fast opening and closing of the second valve 3 between water cavity 21 and air chamber 22, it is preferable that the second valve 3 wraps
Include for being connected or closed water cavity 21 and air chamber 22 and matched valve plate 31 and the second valve seat, and actuating valve plate 31 do it is past
The valve rod 33 moved again, wherein electromagnetic driven component 4 are connect with valve rod 33, and the resetting movement of valve rod 33 is by being set in valve rod
Second spring 34 on 33 is realized；Preferably, valve plate 31 and the second valve seat include two be oppositely arranged, to realize pump group
The rapid damage of siphonage when shutdown.Preferably, further include man-operated mechanism 7 for opening and closing the second valve 3, for artificial tight
Emergency stop machine.And second PLC control system and the first PLC control system can be same control system.I.e. PLC control system 6 can be same
The working condition of time control dynamic magnetic part 131 and electromagnetic driven component 4, to realize this gradual change type siphon destructive valve intelligence
Change, automation self regulating and control.It is worth noting that the first valve 12 conducting atmospheric environment and the working condition of water cavity 21 are preferably only
Occur in pump group stopping process, closed state (i.e. static magnetic part is in pump group start process and non-operating status
132 and DYNAMIC MAGNETIC part 131 be in attracting state), only normally opened valve 11 is in the conduction state.Certainly, it is not run in pump group
When, the first valve 12 can also be in conducting state, then normally opened valve 11 is in closed state.Preferably, electromagnetic driven component 4,
Man-operated mechanism 7 with 2 detachable connection of valve body, is such as spirally connected.
In the present embodiment, (not operating status) is in pipeline when mainly being shut down for pump group by pressure sensor 5
Vacuum degree is monitored, and can is monitoring in real time or compartment monitoring, be led by PLC control system 6 to control electromagnetic driven component 4
Logical or closed water cavity 21 or air chamber 22, to realize automation in pipeline and Intellectualized monitoring and self regulating and control so that pipe
Vacuum degree in road maintains in preset range value, and then protects entire pump group.It is worth noting that the first valve 12 is connected greatly
The working condition of compression ring border and water cavity 21 preferably only occurs in pump group stopping process, does not run in pump group start process and shape
Closed state (i.e. static magnetic part 132 and DYNAMIC MAGNETIC part 131 are in attracting state) is in state, only at normally opened valve 11
In conducting state.Certainly, when pump group is not run, the first valve 12 can also be in conducting state, then normally opened valve 11 is in envelope
Closed state；It can be determined on a case-by-case basis.In pump group stopping process, the first valve 12 can be controlled by PLC control system 6
Working condition (conducting or closed atmosphere environment with air chamber 22) realizing the stage reduction air inflow of water cavity 21 (i.e. pipeline) and
Realize the destruction of siphonage.Here preset value is preferably the arbitrary value between 3-20s.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the utility model
Preferred embodiment, it is noted that for those skilled in the art, do not departing from the utility model principle
Under the premise of, several improvements and modifications can also be made, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (10)
1. a kind of gradual change type valve suitable for siphon destructive valve, which is characterized in that including：
The air chamber of the siphon destructive valve and the normally opened valve of atmospheric environment is connected；
First valve；And
Selection mechanism；
The selection mechanism controls the working condition of first valve, logical between the air chamber and atmospheric environment to adjust
Tolerance.
2. gradual change type valve according to claim 1, it is characterised in that：
The ventilatory capacity of the normally opened valve is more than the ventilatory capacity of first valve；
The air chamber is connected with after atmospheric environment to preset time in the normally opened valve, and the selection mechanism control is described normally opened
Valve closes the air chamber and the air chamber and atmospheric environment is connected with atmospheric environment, first valve.
3. gradual change type valve according to claim 1 or 2, which is characterized in that further include：
It is installed on the valve seat of the siphon destructive valve；
The normally opened valve is adapted with the valve seat, and the normally opened valve, which is equipped with, is connected the of the air chamber and atmospheric environment
One venthole；
First valve is set to the normally opened valve close to the side of atmospheric environment, and it is logical that first valve corresponds to described first
The position of stomata is equipped with the second venthole；
The size of first venthole is more than the size of the second venthole；
The selection mechanism drives first valve separate or the fitting normally opened valve.
4. gradual change type valve according to claim 3, it is characterised in that：
The selection mechanism includes the DYNAMIC MAGNETIC part being connect with first valve and is arranged far from first valve
Static magnetic part；
When the DYNAMIC MAGNETIC part is in attracting state with the static magnetic part, the normally opened valve is on the air
Chamber and atmospheric environment state, first valve are in closed state；
When the DYNAMIC MAGNETIC part is in discrete state with the static magnetic part, first valve is on the air
Chamber and atmospheric environment state, the normally opened valve are in closed state.
5. gradual change type valve according to claim 4, it is characterised in that：
The selection mechanism further includes mounting plate, the first connector and the second connector；
After first connector runs through the normally opened valve, both ends are connect with the valve seat and the mounting plate respectively；
After second connector runs through first valve, both ends are connect with the valve seat and the mounting plate respectively；
The mounting plate is equipped with the static magnetic part close to the surface of the valve seat side；
First valve is equipped with the DYNAMIC MAGNETIC part close to the surface of the mounting plate side.
6. gradual change type valve according to claim 5, it is characterised in that：
First connector is equipped with limit protrusion close to the end of the mounting plate side；
And/or
The static magnetic part is installed on the mounting plate by mounting base；
The mounting base is equipped with pilot hole so that the guide post being connect with the DYNAMIC MAGNETIC part is reciprocal in being done in the pilot hole
Movement.
7. according to the gradual change type valve described in claim 4-6 any one, it is characterised in that：
The selection mechanism further includes the first PLC control system being connect with the DYNAMIC MAGNETIC part.
8. a kind of gradual change type siphon destructive valve, which is characterized in that including：
Valve body, the valve body are equipped with water cavity and air chamber；
The second valve for being connected or closing the water cavity and the air chamber；And
Gradual change type valve described in the claims 1-7 any one.
9. gradual change type siphon destructive valve according to claim 8, which is characterized in that further include：
Pressure sensor for the pressure value for monitoring the water chamber air；
Second PLC control system；And
Electromagnetic driven component for opening and closing second valve；
Second PLC control system is connect with the electromagnetic driven component, the pressure sensor respectively.
10. gradual change type siphon destructive valve according to claim 9, it is characterised in that：
It further include the man-operated mechanism for opening and closing second valve；
And/or
Second PLC control system is same control system with the first PLC control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721781740.9U CN207634709U (en) | 2017-12-19 | 2017-12-19 | A kind of gradual change type valve and gradual change type siphon destructive valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721781740.9U CN207634709U (en) | 2017-12-19 | 2017-12-19 | A kind of gradual change type valve and gradual change type siphon destructive valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207634709U true CN207634709U (en) | 2018-07-20 |
Family
ID=62852171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721781740.9U Withdrawn - After Issue CN207634709U (en) | 2017-12-19 | 2017-12-19 | A kind of gradual change type valve and gradual change type siphon destructive valve |
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| Country | Link |
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| CN (1) | CN207634709U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108036059A (en) * | 2017-12-19 | 2018-05-15 | 上海晟江机械设备有限公司 | A kind of gradual change type valve and gradual change type siphon destructive valve and its control method |
-
2017
- 2017-12-19 CN CN201721781740.9U patent/CN207634709U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108036059A (en) * | 2017-12-19 | 2018-05-15 | 上海晟江机械设备有限公司 | A kind of gradual change type valve and gradual change type siphon destructive valve and its control method |
| CN108036059B (en) * | 2017-12-19 | 2023-12-15 | 上海晟江机械设备有限公司 | Gradual change valve, gradual change siphon break valve and control method thereof |
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