CN209674249U - Pressure control device and voltage-regulating system - Google Patents
Pressure control device and voltage-regulating system Download PDFInfo
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- CN209674249U CN209674249U CN201920526858.XU CN201920526858U CN209674249U CN 209674249 U CN209674249 U CN 209674249U CN 201920526858 U CN201920526858 U CN 201920526858U CN 209674249 U CN209674249 U CN 209674249U
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Abstract
The utility model discloses pressure control device and voltage-regulating system.The pressure control device includes: electric conversion device, converts electrical signals to pressure signal, and control the fluid pressure for leading to pressure regulator comprising: fluid inlet, for connecting the on high-tension side pipeline of pressure regulator；Fluid outlet, for connecting the driving chamber of pressure regulator；Outlet, fluid for being discharged in electric conversion device, to reduce the fluid pressure in electric conversion device；Signal receiving element is converted to pressure signal for receiving external electric signal, and by external electric signal；Control element, connection signal receiving element control the aperture of outlet according to pressure signal；First switching element is set to the fluid inlet side of electric conversion device, controls the fluid on-off in the pipeline of the fluid inlet side of electric conversion device；Unidirectional flow-limiting element is set to the fluid outlet side of electric conversion device, limits flowing of the fluid of the fluid outlet side of electric conversion device to electric conversion device direction.
Description
Technical field
The utility model relates to a kind of pressure control device and the voltage-regulating system with the pressure control device.
Background technique
Pressure regulator is so that its fluid outlet is kept setting for authorized pressure by changing the fluid flow through pressure regulator automatically
It is standby.It is generally divided into direct acting type and two kinds of indirect acting type.Although existing pressure regulator can change the stream by pressure regulator
Body flow, but the pressure of the fluid of the outflow after change is definite value substantially, after its installation, is difficult to pressure regulator fluid outlet
The fluid pressure of side is adjusted.
Utility model content
For the defects in the prior art, the purpose of the utility model is to provide a kind of for controlling the fluid pressure of pipeline
Pressure control device and voltage-regulating system with the pressure control device.The pressure control device can be in voltage-regulating system
Pressure regulator driving chamber in pressure controlled, with change outflow pressure regulator low-pressure side fluid pressure.
According to one aspect of the disclosure a kind of pressure control device is provided, the pressure of the fluid for controlling pipeline,
The pressure control device includes: electric conversion device, converts electrical signals to pressure signal, and control the stream for leading to pressure regulator
Body pressure, the electric conversion element includes: fluid inlet, for connecting the on high-tension side pipeline of pressure regulator；Fluid outlet is used
In the driving chamber of connection pressure regulator；Outlet, fluid for being discharged in the electric conversion device, to reduce described electrical turn
Fluid pressure in parallel operation part；Signal receiving element, for receiving external electric signal, and the external electric signal that will be received
Be converted to pressure signal；Control element connects the signal receiving element, controls the outlet according to the pressure signal
Aperture；First switching element is set to the fluid inlet side of the electric conversion device, for controlling the electric conversion device
Fluid inlet side pipeline in fluid on-off；Unidirectional flow-limiting element is set to the fluid outlet of the electric conversion device
Side, flowing of the fluid to electric conversion device direction of the fluid outlet side for limiting the electric conversion device.
In pressure control device according to one aspect of the disclosure, the pressure control device further includes exhaust member
Part, the expulsion element are set to the outlet side of the Unidirectional flow-limiting element, for discharging the outlet of the Unidirectional flow-limiting element
Fluid in the pipeline of side.
In pressure control device according to one aspect of the disclosure, the expulsion element is diffusion valve.
In pressure control device according to one aspect of the disclosure, the Unidirectional flow-limiting element is check valve.
In pressure control device according to one aspect of the disclosure, the first switching element is solenoid valve, described
Solenoid valve receives external electric signal by remote data transmission, and according to the external electric signal control fluids within pipes received
On-off.
In pressure control device according to one aspect of the disclosure, the pressure control device further includes filter,
The filter is set between the first switching element and the electric conversion device.
In pressure control device according to one aspect of the disclosure, the pressure control device further includes pressure reducing valve,
The pressure reducing valve is set between the first switching element and the electric conversion device.
In pressure control device according to one aspect of the disclosure, the pressure control device further includes needle-valve, institute
State the fluid outlet side that needle-valve is set to the electric conversion device.
In pressure control device according to one aspect of the disclosure, the signal receiving element is passed by teledata
Defeated reception external electric signal, and the external electric signal received is converted into pressure signal.
In pressure control device according to one aspect of the disclosure, the pressure control device further includes multiple pressure
Device is detected, the multiple pressure sensing devices detect fluid inlet and the fluid outlet side of the electric conversion device respectively
Fluid pressure in pipeline.
A kind of voltage-regulating system is also provided according to another aspect of the present disclosure, and the voltage-regulating system includes: pressure regulator, the tune
Depressor includes driving chamber；And above-mentioned pressure control device, the fluid outlet of the pressure control device are connected to the tune
The driving chamber of depressor.
In voltage-regulating system according to another aspect of the disclosure, the voltage-regulating system further includes second switch element,
The second switch element is switching ball, and the switching ball is set to the fluid inlet side of the pressure control device.
In voltage-regulating system according to another aspect of the disclosure, the fluid outlet of the electric conversion device is also connected with
To the low pressure fluid conduit of the low-pressure side of pressure regulator.
Compared with the prior art, pressure control device provided by the utility model and the tune with the pressure control device
In pressure system, since pressure control device can effectively control the pressure regulator of voltage-regulating system, pressure regulation is flowed through to change
The fluid pressure of device, and the pressure control device has unidirectional limit element, it can be to avoid pressure control device because of power loss, device
Pressure regulator is influenced when part failure or communication failure to the safety of the entire voltage-regulating system of the regulating guarantee of fluid pressure
Operation.In addition, the pressure control device also has many advantages, such as that structure is simple, easy for installation, it is with a wide range of applications.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other spies of the utility model
Sign, objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram of the pressure control device of the one embodiment for showing the utility model；
Fig. 2 is the structural representation of the electric conversion device of the pressure control device of the one embodiment for showing the utility model
Figure；And
Fig. 3 is the structural schematic diagram for showing the voltage-regulating system of one embodiment of the utility model.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that this is practical new
Type will be full and complete, and the design of example embodiment is comprehensively communicated to those skilled in the art.It is identical in figure
Appended drawing reference indicate same or similar structure, thus repetition thereof will be omitted.
Described feature, structure or characteristic can be incorporated in one or more embodiments in any suitable manner
In.In the following description, many details are provided to provide and fully understand to the embodiments of the present invention.So
And one of ordinary skill in the art would recognize that, without one or more in specific detail, or using other methods, constituent element,
Material etc. can also practice the technical solution of the utility model.In some cases, be not shown in detail or describe known features,
Material or operation are to avoid fuzzy the utility model.
Purport design according to the present utility model, the pressure control device of the utility model, for controlling pipeline
The pressure of fluid comprising: electric conversion device converts electrical signals to pressure signal, and controls the fluid for leading to pressure regulator
Pressure, the electric conversion element includes: fluid inlet, for connecting the on high-tension side pipeline of pressure regulator；Fluid outlet is used for
Connect the driving chamber of pressure regulator；Outlet, fluid for being discharged in the electric conversion device, to reduce the electric conversion
Fluid pressure in device；Signal receiving element turns for receiving external electric signal, and by the external electric signal received
It is changed to pressure signal；Control element connects the signal receiving element, controls opening for the outlet according to the pressure signal
Degree；First switching element is set to the fluid inlet side of the electric conversion device, for controlling the electric conversion device
Fluid on-off in the pipeline of fluid inlet side；Unidirectional flow-limiting element is set to the fluid outlet side of the electric conversion device,
For limiting flowing of the fluid to electric conversion device direction of the fluid outlet side of the electric conversion device.
The technology contents of the utility model are described further with reference to the accompanying drawings and examples.
Referring to Figure 1, it illustrates the structural schematic diagrams of the pressure control device of one embodiment of the utility model.It needs
It is noted that the pressure control device in the utility model is mainly used for controlling the pressure of the fluid of pipeline.Wherein, the pressure
Control device is mainly used in the pressure control of the natural gas in natural gas line, therefore, in the examples below, mainly with pipe
The case where fluid in road is natural gas is illustrated.In the preferred embodiment of the utility model, the pressure control device
It mainly include electric conversion device 1, first switching element and Unidirectional flow-limiting element.
Specifically, electric conversion device 1 converts electrical signals to pressure signal, and controls the fluid pressure for leading to pressure regulator
By force.Fig. 2 is referred to, it illustrates the structures of the electric conversion device of the pressure control device of one embodiment of the utility model
Schematic diagram.As shown in Fig. 2, electric conversion element 1 includes: fluid inlet 11, fluid outlet 12, outlet 13, signal reception member
Part 14 and control element.
Wherein, fluid inlet 11 is used to connect the on high-tension side pipeline of pressure regulator.Fluid outlet 12 is for connecting pressure regulator
Driving chamber.After fluid inlet 11 connects the on high-tension side pipeline of pressure regulator, the high pressure in the on high-tension side pipeline of pressure regulator
It, can when fluid flows into the fluid inlet 11 of electric conversion device 1 and enters the driving chamber of pressure regulator from the outflow of fluid outlet 12
Increase the fluid pressure in the driving chamber of pressure regulator, makes the high-pressure fluid in the on high-tension side pipeline of pressure regulator after pressure regulator
The pressure of fluid in the pipeline of the low-pressure side of outflow increases.
Outlet 13 be used for be discharged in electric conversion device 1 fluid, to reduce the fluid pressure in electric conversion device 1
By force.The fluid in electric conversion device 1 can be discharged in outlet 13, when the fluid section in electric conversion device 1 passes through discharge
The pressure of fluid after 13 discharge of mouth in electric conversion device 1 reduces, and then the pressure of the fluid in the driving chamber of inflow pressure regulator
Power reduces, it is thereby possible to reduce the low pressure for flowing out the high-pressure fluid in the on high-tension side pipeline of pressure regulator after pressure regulator
The incrementss of the pressure of fluid in the pipeline of side.In turn, the amount for the fluid being discharged according to outlet 13 can be to outflow pressure regulation
The incrementss of the pressure of fluid in the pipeline of the low-pressure side of device are controlled.Wherein, the amount for fluid outlet 13 being discharged
Control can be controlled in the present embodiment for example, by the aperture to outlet 13 to realize.
Signal receiving element 14 is converted to pressure letter for receiving external electric signal, and by the external electric signal received
Number.In the preferred embodiment of the utility model, signal receiving element receives external electric signal by remote data transmission, such as
Can by long-range real-time monitoring system to signal receiving element send signal, with this realize in pipe network fluid pressure it is remote
Process control.The external electric signal received is converted to pressure signal will pass through pressure signal to electrical by signal receiving element 14
Pressure inside switching device 1 is controlled.
Control element (not shown) connection signal receiving element 14, and outlet 13 is controlled according to pressure signal
Aperture.The control element can be any element realized and controlled the aperture of outlet 13, such as removable valve
Deng it will not be described here.
First switching element is set to the fluid inlet side of electric conversion device, for controlling the stream of electric conversion device 1
Fluid on-off in the pipeline of body entrance side.In the embodiment shown in fig. 1, first switching element is optionally solenoid valve 2.Electricity
Magnet valve 2 can receive external electric signal by remote data transmission, and controlled in pipeline and flowed according to the external electric signal received
The on-off of body.Wherein, it is highly preferred that solenoid valve 2 can be set to be substantially at normally off, only when it receives external telecommunications
Number when open；In other words, solenoid valve 2 is set as only the fluid in pipeline being allowed to circulate when it receives external electric signal.In
In embodiment shown in FIG. 1, the fluid inlet side of electric conversion device 1 is left side, and solenoid valve 2 is set to electric conversion device 1
In the high-pressure gas pipelines in left side, to control the on-off of the high pressure gas in pipeline.
Unidirectional flow-limiting element is set to the fluid outlet side of electric conversion device 1, for limiting the stream of electric conversion device 1
Flowing of the fluid of body outlet side to 1 direction of electric conversion device.Specifically, in the embodiment shown in fig. 1, described unidirectional
Current limiting element is check valve 3.Check valve 3 is set to the right side pipeline of electric conversion device 1, from the fluid of electric conversion device 1
The fluid of 12 outflow of outlet by the limitation of check valve 3, can not be back to electric conversion device 1 after check valve 3.Check valve 3 can
To prevent non-return stream, guarantees the fluid pressure in the fluid outlet side to the pipeline of the driving chamber of pressure regulator of electric conversion device 1, keep away
Exempt from because in pipeline the damage of other components due to influence pressure regulator pressure control, guarantor is played to pipeline and entire voltage-regulating system
Shield effect.
It should be noted that Unidirectional flow-limiting element is also possible to an electromagnetism in other embodiments of the utility model
Valve, the solenoid valve is only when the fluid pressure in the pipeline that the fluid pressure in the pipeline of fluid inlet side is greater than fluid outlet side
When open, the effect of its Unidirectional flow-limiting is realized with this.Similar effect equally may be implemented in the embodiment, and it will not be described here.
Further, in the embodiments of the present invention, the pressure control device further includes expulsion element.The exhaust
Element is set to the outlet side of Unidirectional flow-limiting element, the fluid in the pipeline of the outlet side for discharging Unidirectional flow-limiting element.Tool
For body, in the embodiment shown in fig. 1, the expulsion element is diffusion valve 4.The fluid that diffusion valve 4 is set to check valve 3 goes out
The pipeline of mouth side, can be by the gas into discharge tube, to reduce the pressure of gas in pipelines, in turn, when check valve 3
Fluid outlet side pipeline in gas pressure intensity it is constant in the case where, open diffusion valve 4 and can reduce the fluid of check valve 3
Gas pressure intensity in the pipeline of mouth side, reduces the gas pressure intensity in the driving chamber of pressure regulator connected to it, in turn, makes pressure regulation
The pressure of fluid in the pipeline for the low-pressure side that high-pressure fluid in the on high-tension side pipeline of device flows out after pressure regulator reduces.
Further, in the embodiments of the present invention, the pressure control device further includes filter.Filter is set
It is placed between first switching element and the electric conversion device.As shown in Figure 1, filter 5 is set to solenoid valve 2 and electrical turn
Between the fluid inlet 11 of parallel operation part 1, filter 5 can be filtered the fluid for flowing into electropneumatic transducer part 1, remove pipeline
Impurity present in interior fluid plays the role of protection to the lesser pipeline of caliber.
Further, in the embodiments of the present invention, the pressure control device further includes pressure reducing valve.The pressure reducing valve
It is set between first switching element and electric conversion device.Specifically, in the embodiment shown in fig. 1, pressure reducing valve 6 is arranged
Between filter 5 and the fluid inlet 11 of electric conversion device 1.It should be noted that due to the fluid of electric conversion device 1
Entrance 11 is the on high-tension side pipeline for connecting pressure regulator, and fluid pressure with higher in the on high-tension side pipeline of pressure regulator,
Therefore, pressure reducing valve 6 pressure reducing valve 6 can be set in the fluid inlet side of electric conversion device 1 can be by higher fluid pressure (the
One pressure) it is converted to the fluid (the second pressure, less than the first pressure) compared with low pressure, the first above-mentioned pressure and the second pressure
It is by force definite value.In addition it is also necessary to explanation, although in the embodiment shown in fig. 1, pressure reducing valve 6 is set to 5 He of filter
Between the fluid inlet 11 of electric conversion device 1, but it is not limited to this, and the position between pressure reducing valve 6 and filter 5 is also can be with
It exchanges, i.e., high-pressure fluid is filtered after first passing through decompression in inflow filter 5, which equally may be implemented, herein
It repeats.
Further, in the embodiments of the present invention, the pressure control device further includes needle-valve.The needle-valve can be with
It is set to the fluid outlet side of electric conversion device.In the embodiment shown in fig. 1, needle-valve 7 is set to electric conversion device 1
Fluid outlet side, and the fluid flowed out from electric conversion device 1 after needle-valve 7, flow to the drive of diffusion valve 4 and pressure regulator
Dynamic chamber.The needle-valve 7 can further adjust the fluid flow flowed through, to play a protective role to pipeline.
Further, in the embodiments of the present invention, the pressure control device further includes multiple pressure detectors
Part.Multiple pressure sensing devices can detect the stream in the fluid inlet of electric conversion device and the pipeline of fluid outlet side respectively
Body pressure.In the embodiment shown in fig. 1, pressure sensing devices 81 are set to the fluid inlet lateral line of electric conversion device 1
In and be located at the fluid inlet side of solenoid valve 2, flow to the fluid pressure of the pressure control device to detect；Pressure sensing devices
82 are set to the fluid outlet side of check valve 3, have detected the fluid pressure flowed out by electric conversion device 1.It should be noted that
Each pressure sensing devices of pressure control device can carry out remote data acquisition, such as be sent to remote monitoring system, with
Just the fluid pressure in each pipeline is monitored in real time.
Further, the utility model also provides a kind of voltage-regulating system.Fig. 3 is referred to, it illustrates the utility model
The structural schematic diagram of the voltage-regulating system of one embodiment.The voltage-regulating system includes at least pressure regulator 9 and above-mentioned shown in Fig. 2
Pressure control device.As shown in figure 3, the side of pressure regulator 9 connects high-pressure fluid pipes 92, the other side connects low-pressure fluid pipe
Road 93.Pressure regulator 9 further includes driving chamber 91.The fluid outlet of above-mentioned pressure control device is connected to the driving chamber 91 of pressure regulator 9.
More specifically, when pressure control device inputs fluid to driving chamber 91 to increase the fluid pressure in driving chamber 91, driving
Balance film above chamber moves under the driving of pressure, in turn, drives the aperture of the valve port inside pressure regulator to increase logical to increase
The fluid flow of valve port is crossed, with the fluid pressure in the low pressure fluid conduit 93 of this fluid outlet side for increasing pressure regulator 9.Accordingly
Ground, when the fluid in driving chamber 91 is discharged pressure control device, the fluid pressure in driving chamber 91 is reduced, and balance film is at it
It is moved under the action of the spring of the other side, in turn, the aperture of the valve port inside pressure regulator is driven to reduce to reduce through valve port
Fluid flow, with the fluid pressure in the low pressure fluid conduit 93 of this fluid outlet side for reducing pressure regulator 9.Pressure control device
Realize that the fluid pressure of the fluid outlet side to outflow pressure regulator controls through the above way.
Further, in the preferred embodiment of the utility model, the voltage-regulating system further includes second switch element.In
In embodiment shown in Fig. 3, the second switch element is switching ball 20.Switching ball 20 is set to pressure control device
Fluid inlet side, during construction, maintenance, repair using, to the on-off of the high-pressure fluid for flowing to pressure control device into
Row control.
Further, in preferred embodiment shown in Fig. 3, the fluid outlet of the electric conversion device is also connected to tune
The low pressure fluid conduit 93 of the low-pressure side of depressor.In turn, it is switched to when voltage-regulating system by self-acting operation (no external control) distant
When allocation and transportation row (receive external control), handoff procedure is steady, and when remote regulating operation outside the failure of the remote regulating system failure when,
Pressure regulator can still keep self-acting operation, avoid the occurrence of safety accident.
Further, in preferred embodiment shown in Fig. 3, the voltage-regulating system further includes pressure sensing devices 83 and pressure
Force detector part 84.Wherein, pressure sensing devices 83 are set on high-pressure fluid pipes 92, and pressure sensing devices 84 are set to low
Press fluid line 93.Pass through the pressure of voltage-regulating system pressure sensing devices 83 and pressure sensing devices 84 and pressure control device
Detection device 81 and pressure sensing devices 82 may be implemented to carry out the pressure in pipeline each in voltage-regulating system effective in real time
Monitoring.
In conclusion pressure control device provided by the embodiment of the utility model and the tune with the pressure control device
In pressure system, since pressure control device can effectively control the pressure regulator of voltage-regulating system, pressure regulation is flowed through to change
The fluid pressure of device, and the pressure control device has unidirectional limit element, it can be to avoid pressure control device because of power loss, device
Pressure regulator is influenced when part failure or communication failure to the safety of the entire voltage-regulating system of the regulating guarantee of fluid pressure
Operation.In addition, the pressure control device also has many advantages, such as that structure is simple, easy for installation, it is with a wide range of applications.
Although the utility model is disclosed as above with alternative embodiment, it is not intended to limit the utility model.This
Utility model person of ordinary skill in the field, it is without departing from the spirit and scope of the utility model, various when that can make
It changes and modifies.Therefore, the protection scope of the utility model is subject to the range defined depending on claims.
Claims (13)
1. a kind of pressure control device, the pressure of the fluid for controlling pipeline, which is characterized in that the pressure control device packet
It includes:
Electric conversion device converts electrical signals to pressure signal, and controls the fluid pressure for leading to pressure regulator, and described electrical turn
Changing element includes:
Fluid inlet, for connecting the on high-tension side pipeline of pressure regulator；
Fluid outlet, for connecting the driving chamber of pressure regulator；
Outlet, fluid for being discharged in the electric conversion device, to reduce the fluid pressure in the electric conversion device
By force；
Signal receiving element is converted to pressure signal for receiving external electric signal, and by the external electric signal received；
Control element connects the signal receiving element, and the aperture of the outlet is controlled according to the pressure signal；
First switching element is set to the fluid inlet side of the electric conversion device, for controlling the electric conversion device
Fluid inlet side pipeline in fluid on-off；
Unidirectional flow-limiting element is set to the fluid outlet side of the electric conversion device, for limiting the electric conversion device
Fluid outlet side flowing of the fluid to electric conversion device direction.
2. pressure control device as described in claim 1, which is characterized in that the pressure control device further includes exhaust member
Part, the expulsion element are set to the outlet side of the Unidirectional flow-limiting element, for discharging the outlet of the Unidirectional flow-limiting element
Fluid in the pipeline of side.
3. pressure control device as claimed in claim 2, which is characterized in that the expulsion element is diffusion valve.
4. pressure control device as described in claim 1, which is characterized in that the Unidirectional flow-limiting element is check valve.
5. pressure control device as described in claim 1, which is characterized in that the first switching element is solenoid valve, described
Solenoid valve receives external electric signal by remote data transmission, and according to the external electric signal control fluids within pipes received
On-off.
6. pressure control device as described in claim 1, which is characterized in that the pressure control device further includes filter,
The filter is set between the first switching element and the electric conversion device.
7. pressure control device as described in claim 1, which is characterized in that the pressure control device further includes pressure reducing valve,
The pressure reducing valve is set between the first switching element and the electric conversion device.
8. pressure control device as described in claim 1, which is characterized in that the pressure control device further includes needle-valve, institute
State the fluid outlet side that needle-valve is set to the electric conversion device.
9. pressure control device as described in claim 1, which is characterized in that the signal receiving element is passed by teledata
Defeated reception external electric signal, and the external electric signal received is converted into pressure signal.
10. pressure control device as described in claim 1, which is characterized in that the pressure control device further includes multiple pressures
Force detector part, the multiple pressure sensing devices detect fluid inlet and the fluid outlet side of the electric conversion device respectively
Pipeline in fluid pressure.
11. a kind of voltage-regulating system, which is characterized in that the voltage-regulating system includes:
Pressure regulator, the pressure regulator include driving chamber；And
Pressure control device as described in any one of claims 1 to 10, the fluid outlet connection of the pressure control device
To the driving chamber of the pressure regulator.
12. voltage-regulating system as claimed in claim 11, which is characterized in that the voltage-regulating system further includes second switch element,
The second switch element is switching ball, and the switching ball is set to the fluid inlet side of the pressure control device.
13. voltage-regulating system as claimed in claim 11, which is characterized in that the fluid outlet of the electric conversion device is also connected with
To the low pressure fluid conduit of the low-pressure side of pressure regulator.
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| CN201920526858.XU CN209674249U (en) | 2019-04-17 | 2019-04-17 | Pressure control device and voltage-regulating system |
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| CN201920526858.XU CN209674249U (en) | 2019-04-17 | 2019-04-17 | Pressure control device and voltage-regulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111831021A (en) * | 2019-04-17 | 2020-10-27 | 上海航天能源股份有限公司 | Pressure control device and pressure regulating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111831021A (en) * | 2019-04-17 | 2020-10-27 | 上海航天能源股份有限公司 | Pressure control device and pressure regulating system |
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