CN108999822A - A kind of pile-up valve air guide path control system - Google Patents
A kind of pile-up valve air guide path control system Download PDFInfo
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- CN108999822A CN108999822A CN201810874228.1A CN201810874228A CN108999822A CN 108999822 A CN108999822 A CN 108999822A CN 201810874228 A CN201810874228 A CN 201810874228A CN 108999822 A CN108999822 A CN 108999822A
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- path control
- water route
- control valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
- Valve Housings (AREA)
Abstract
The invention discloses a kind of pile-up valve air guide path control systems, including gas path control valve ontology, the front surface of gas path control valve ontology is provided with pressure switch, gas path control valve ontology is connected with pressure switch, the two sides of pressure switch front surface are threaded with the 4th thread straight-through, pressure switch is connected with the 4th thread straight-through, and the front side and rear side on the left of gas path control valve ontology have been respectively fixedly connected with third water route siphunculus and the second water route siphunculus.Invention achieves assembly to be easy, and gas circuit precise control is at low cost, high-efficient, replacement is simple, easy to operate, multichannel may be implemented while controlling, convenient for the effect of personnel's software control, to keep product shape beauty smooth, it is easily assembled in assembling assembling process, the gas circuit performance of air-path control system is improved, the situation of air-path control system leakage is avoided, while improving producers' installation effectiveness, achieve the purpose that save instrument cost, has been suitble to promote the use of.
Description
Technical field
The present invention relates to ICP emission spectrometer technical field, specially a kind of pile-up valve air guide path control system.
Background technique
ICP emission spectrometer, that is, inductively-coupled plasma spectrometer, ICP emission spectrometry is according in excitation state
Elements Atom to be measured returns to the method that the characteristic spectral line emitted when ground state analyzes element to be measured, ICP emission spectrometer master
To be applied to the Qualitative and quantitative analysis of inorganic elements.
Product composition is divided into: sampling system, and sampling system is part and ICP spectrum particularly important in ICP instrument point
Most active field in analysis research, can use liquid, gas or direct solid sample introduction by sample state difference respectively；Inductive coupling
Plasma source (ICP)；Light splitting (dispersion) system of spectrometer, complex light obtain one by wave after the light splitting of dispersion element
Composite light beam, can be decomposed into monochromatic light, and the equipment for carrying out observational record is known as spectrometer by long tactic spectrum；Detection
Device-electrooptical device, electrooptical device are the cores that Photoelectric Spectrometer receives system, mainly utilize photoelectric effect
The radiation energy of different wave length is converted to the signal of photoelectric current.
ICP emission spectrometer is mainly used for the analysis of microelement, analyzable element be most of metal and silicon,
A small amount of nonmetallic such as phosphorus, sulphur, is widely used in the elemental analysis of quality control by totally 72 kinds, the detection of ultramicro-element, especially
It is the water quality monitoring in environment protection field, can also be detected to macroelement, such as in the measurement of component, main component
Element determination.
ICP air-path control system is the important composition component of ICP emission spectrometer, and ICP air-path control system can pass through
Pile-up valve, which is led, realizes the control of instrument multichannel gas circuit, while adding two-bit triplet solenoid valve, realizes that multichannel gas jointly controls, however mesh
Preceding market gas circuit control cooperates spinner flowmeter and check valve to realize inner air path control by multiple air circuit connection heads, so not
Producers' assembly is only influenced, and is easy to appear piping connection and gas leakage occurs, spinner flowmeter time length will also calibrate,
Easilying lead to instrument igniting can not carry out, and gas flow optimized deviation is big, causes whole instrument performance poor.
Summary of the invention
The purpose of the present invention is to provide a kind of pile-up valve air guide path control systems, to solve to propose in above-mentioned background technique
The control of existing market gas circuit cooperate spinner flowmeter and check valve to realize that inner air path controls by multiple air circuit connection heads, this
Sample not only influences producers' assembly, but also is easy to appear piping connection and gas leakage occur, and spinner flowmeter time length is also wanted
Calibration, it is easy to cause instrument igniting that can not carry out, gas flow optimized deviation is big, leads to the problem of whole instrument performance difference.
To achieve the above object, the invention provides the following technical scheme: a kind of pile-up valve air guide path control system, including gas
Road controls valve body, and the front surface of the gas path control valve ontology is provided with pressure switch, the gas path control valve ontology and pressure
Power switch is connected, and the two sides of the pressure switch front surface are threaded with the 4th thread straight-through, the pressure switch with
4th thread straight-through is connected, and it is logical that the front side and rear side on the left of the gas path control valve ontology have been respectively fixedly connected with third water route
Pipe and the second water route siphunculus, second water route siphunculus and third water route siphunculus are connected with gas path control valve ontology, described
The bottom of second water route siphunculus and the bottom of third water route siphunculus are communicated with the second water route interface conduit, the gas path control valve
Rear side on the left of bodies top offers the first air-path interface, and the quantity of first air-path interface is three, first gas
Road interface is connected with gas path control valve ontology, and the screw top of the first air-path interface of left side is connected with third thread straight-through, institute
It states the front side on the left of gas path control valve bodies top and offers the second air-path interface, the quantity of second air-path interface is two
A, second air-path interface is connected with gas path control valve ontology, the top and two, right side of second air-path interface
The top of one air-path interface is threaded with plug wire, is threaded with the first spiral shell on the right side of the gas path control valve bodies top
Line is straight-through, and the quantity of first thread straight-through is three, and first thread straight-through is connected with gas path control valve ontology, institute
It states the left side on rear side of gas path control valve ontology and is fixedly connected with the second thread straight-through, the quantity of second thread straight-through is two
A, second thread straight-through is connected with gas path control valve ontology, and the rear side on the right side of the gas path control valve ontology is fixed to be connected
It is connected to solenoid valve, the inner cavity of the solenoid valve is provided with electromagnetic valve core, and the solenoid valve is connected with gas path control valve ontology, institute
It states and is fixedly connected with the first water route siphunculus at the top of solenoid valve, the solenoid valve is connected with the first water route siphunculus, and described first
The first water route interface conduit is communicated on the right side of the siphunculus bottom of water route, the inner cavity of the gas path control valve ontology successively offers
One cavity, the second cavity, third cavity and the 4th cavity, second cavity are connected with the first cavity, the third cavity
It is connected with the second cavity, the 4th cavity is connected with third cavity, and the inner cavity of first cavity is provided with the first resistance
Buddhist nun's spool, the inner cavity of second cavity are provided with the second damping spool, and the inner cavity of the third cavity is provided with third damping
Spool, the inner cavity of the 4th cavity are provided with the 4th damping spool.
Preferably, the model P000-303-P53 of the solenoid valve, the model ALT026-9 of the electromagnetic valve core.
Preferably, the diameter of the first damping spool is point two millimeter, and the diameter of the second damping spool is zero
The diameter of one millimeter of point, the third damping spool is nought point four millimeter, and the diameter of the 4th damping spool is 0. 3 millis
Rice, it is described first damping spool, second damping spool, third damping spool and the 4th damping spool material be SUS404 not
Become rusty steel.
Preferably, the radius of the plug wire is 0. 125 millimeters, and the material of the plug wire is SUS404 stainless steel, institute
It states plug wire and is sealed using thread locking adhesive with the junction of the first air-path interface and the second air-path interface.
Preferably, the specification of first thread straight-through, the second thread straight-through and third thread straight-through is SPC06-01,
The specification of 4th thread straight-through be SPC10-02, first thread straight-through, the second thread straight-through, third thread straight-through and
The junction of 4th thread straight-through is sealed using thread locking adhesive.
Preferably, the material of first water route interface conduit and the second water route interface conduit is LY12.
Compared with prior art, beneficial effects of the present invention are as follows:
The present invention by gas path control valve ontology, the first thread straight-through, the first water route interface conduit, the first water route siphunculus,
First air-path interface, the second thread straight-through, third thread straight-through, the second air-path interface, the second water route siphunculus, third water route are logical
Pipe, the second water route interface conduit, pressure switch, the 4th thread straight-through, the first damping spool, the second damping spool, third damping
Spool, the 4th damp being used cooperatively for spool, solenoid valve and plug wire, have reached assembly and have been easy, and gas circuit precise control is at low cost,
High-efficient, replacement is simple, easy to operate, and multichannel may be implemented while controlling, convenient for the effect of personnel's software control, to make to produce
Product are aesthetic in appearance smooth, are easily assembled in assembling assembling process, improve the gas circuit performance of air-path control system, avoid this
The situation of air-path control system leakage, while producers' installation effectiveness is improved, achieve the purpose that save instrument cost, fit
It closes and promotes the use of.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is elevational schematic view of the present invention；
Fig. 3 is the right view partial cutaway schematic of the present invention.
In figure: 1, gas path control valve ontology；2, the first thread straight-through；3, the first water route interface conduit；4, the first water route is logical
Pipe；5, the first air-path interface；6, the second thread straight-through；7, third thread straight-through；8, the second air-path interface；9, the second water route is logical
Pipe；10, third water route siphunculus；11, the second water route interface conduit；12, pressure switch；13, the 4th thread straight-through；14, solenoid valve
Core；15, the first cavity；16, the first damping spool；17, the second cavity；18, the second damping spool；19, third cavity；20,
Three damping spools；21, the 4th cavity；22, the 4th damping spool；23, solenoid valve；24, plug wire.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-3 is please referred to, the present invention provides a kind of technical solution: a kind of pile-up valve air guide path control system, including gas circuit
Valve body 1 is controlled, the front surface of gas path control valve ontology 1 is provided with pressure switch 12, gas path control valve ontology 1 and pressure switch
12 are connected, and the two sides of 12 front surface of pressure switch are threaded with the 4th thread straight-through 13, pressure switch 12 and the 4th spiral shell
Line straight-through 13 is connected, and the front side in 1 left side of gas path control valve ontology and rear side have been respectively fixedly connected with 10 He of third water route siphunculus
Second water route siphunculus 9, the second water route siphunculus 9 and third water route siphunculus 10 are connected with gas path control valve ontology 1, the second water route
The bottom of siphunculus 9 and the bottom of third water route siphunculus 10 are communicated with the second water route interface conduit 11, and gas path control valve ontology 1 pushes up
Rear side on the left of portion offers the first air-path interface 5, and the quantity of the first air-path interface 5 is three, the first air-path interface 5 and gas circuit
Control valve body 1 is connected, and the screw top of the first air-path interface of left side 5 is connected with third thread straight-through 7, gas path control valve sheet
The second air-path interface 8 is offered on front side of 1 top left side of body, the quantity of the second air-path interface 8 is two, the second air-path interface 8
It is connected with gas path control valve ontology 1, the equal spiral shell in top of the first air-path interface 5 of top and two, right side of the second air-path interface 8
Line is connected with plug wire 24, and the right side at 1 top of gas path control valve ontology is threaded with the first thread straight-through 2, the first thread straight-through 2
Quantity be three, the first thread straight-through 2 is connected with gas path control valve ontology 1, and the left side of the rear side of gas path control valve ontology 1 is consolidated
Surely it is connected with the second thread straight-through 6, the quantity of the second thread straight-through 6 is two, the second thread straight-through 6 and gas path control valve ontology
1 is connected, and the rear side on 1 right side of gas path control valve ontology is fixedly connected with solenoid valve 23, and the inner cavity of solenoid valve 23 is provided with electromagnetism
Spool 14, solenoid valve 23 are connected with gas path control valve ontology 1, and the top of solenoid valve 23 is fixedly connected with the first water route siphunculus 4,
Solenoid valve 23 is connected with the first water route siphunculus 4, and the first water route interface conduit 3 is communicated on the right side of 4 bottom of the first water route siphunculus,
The inner cavity of gas path control valve ontology 1 successively offers the first cavity 15, the second cavity 17, third cavity 19 and the 4th cavity 21,
Second cavity 17 is connected with the first cavity 15, and third cavity 19 is connected with the second cavity 17, and the 4th cavity 21 and third are empty
Chamber 19 is connected, and the inner cavity of the first cavity 15 is provided with the first damping spool 16, and the inner cavity of the second cavity 17 is provided with the second resistance
Buddhist nun's spool 18, the inner cavity of third cavity 19 are provided with third damping spool 20, and the inner cavity of the 4th cavity 21 is provided with the 4th damping
Spool 22.
In the present invention: the model P000-303-P53 of solenoid valve 23, the model ALT026-9 of electromagnetic valve core 14.
In the present invention: the diameter of the first damping spool 16 is point two millimeter, and the diameter of the second damping spool 18 is zero point
One millimeter, third damp spool 20 diameter be nought point four millimeter, the 4th damping spool 22 diameter be 0. 3 millimeters, first
Damping spool 16, second and damping the material of spool 18, third damping spool 20 and the 4th damping spool 22 is SUS404 stainless
Steel.
In the present invention: the radius of plug wire 24 is 0. 125 millimeters, and the material of plug wire 24 is SUS404 stainless steel, plug wire
24 are sealed using thread locking adhesive with the junction of the first air-path interface 5 and the second air-path interface 8.
In the present invention: the specification of the first thread straight-through 2, the second thread straight-through 6 and third thread straight-through 7 is SPC06-
01, the specification of the 4th thread straight-through 13 is SPC10-02, the first thread straight-through 2, the second thread straight-through 6,7 and of third thread straight-through
The junction of 4th thread straight-through 13 is sealed using thread locking adhesive.
In the present invention: the material of the first water route interface conduit 3 and the second water route interface conduit 11 is LY12.
Working principle: the present invention is in use, gas path control valve ontology 1 is by 6061 aluminum components by machine finishing
It is designed processing according to instrument requirements, possesses multichannel stomata, which completes the process cooperation two-position three way magnetic valve can
To realize that multipath gas simultaneously or separately supplies, the first damping spool 16, second of gas path module cooperation finishing is damped
Spool 18, third damping spool 20 and the 4th damping spool 22, can accurately control gas flow in 0.1ml/min range
It is interior, it realizes the multi-way control system that the pile-up valve is led, collects this and led at valve and take up space small, pipe joint is few, and gas circuit, which shunts, to exist
Inside gas path module, the low situation of old-fashioned gas circuit control performance is avoided, whole instrument gas circuit control performance is improved.
In summary: the pile-up valve air guide path control system passes through gas path control valve ontology 1, the first thread straight-through 2,
One water route interface conduit 3, the first water route siphunculus 4, the first air-path interface 5, the second thread straight-through 6, third thread straight-through 7, second
Air-path interface 8, the second water route siphunculus 9, third water route siphunculus 10, the second water route interface conduit 11, pressure switch 12, the 4th screw thread
Straight-through 13, first damping spool 16, second damps spool 18, third damping spool the 20, the 4th damps spool 22,23 and of solenoid valve
Plug wire 24 is used cooperatively, solve existing market gas circuit control by multiple air circuit connection heads cooperate spinner flowmeter and unidirectionally
Valve realizes inner air path control, not only influences producers' assembly in this way, but also be easy to appear piping connection and gas leakage occur,
Spinner flowmeter time length will also calibrate, it is easy to cause instrument igniting that can not carry out, gas flow optimized deviation is big, leads to whole instrument
The problem of device performance difference.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
The electric elements occurred in this article are electrically connected with extraneous main controller and 220V alternating current, and main controller can be meter
Calculation machine etc. plays the conventionally known equipment of control.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of pile-up valve air guide path control system, including gas path control valve ontology (1), it is characterised in that: the gas circuit control
The front surface of valve body (1) is provided with pressure switch (12), and the gas path control valve ontology (1) is connected with pressure switch (12)
Logical, the two sides of pressure switch (12) front surface are threaded with the 4th thread straight-through (13), the pressure switch (12)
It is connected with the 4th thread straight-through (13), the front side and rear side on the left of the gas path control valve ontology (1) have been respectively fixedly connected with
Third water route siphunculus (10) and the second water route siphunculus (9), second water route siphunculus (9) and third water route siphunculus (10) are and gas
Road control valve body (1) is connected, and the bottom of second water route siphunculus (9) is connected to the bottom of third water route siphunculus (10)
There is the second water route interface conduit (11), offers the first air-path interface on rear side of gas path control valve ontology (1) top left side
(5), the quantity of first air-path interface (5) is three, first air-path interface (5) and gas path control valve ontology (1) phase
Connection, the screw top of the first air-path interface of left side (5) are connected with third thread straight-through (7), the gas path control valve ontology (1)
It being offered on front side of top left side the second air-path interface (8), the quantity of second air-path interface (8) is two, described second
Air-path interface (8) is connected with gas path control valve ontology (1), the top and two first, right side of second air-path interface (8)
The top of air-path interface (5) is threaded with plug wire (24), and the right side at the top of the gas path control valve ontology (1) is threadedly coupled
Have the first thread straight-through (2), the quantity of first thread straight-through (2) is three, first thread straight-through (2) and gas circuit control
Valve body (1) processed is connected, and the left side on rear side of the gas path control valve ontology (1) is fixedly connected with the second thread straight-through (6), institute
The quantity for stating the second thread straight-through (6) is two, and second thread straight-through (6) is connected with gas path control valve ontology (1), institute
It states the rear side on the right side of gas path control valve ontology (1) to be fixedly connected with solenoid valve (23), the inner cavity of the solenoid valve (23) is provided with
Electromagnetic valve core (14), the solenoid valve (23) are connected with gas path control valve ontology (1), and the top of the solenoid valve (23) is fixed
It is connected with the first water route siphunculus (4), the solenoid valve (23) is connected with the first water route siphunculus (4), first water route siphunculus
(4) the first water route interface conduit (3) is communicated on the right side of bottom, the inner cavity of the gas path control valve ontology (1) successively offers
First cavity (15), the second cavity (17), third cavity (19) and the 4th cavity (21), second cavity (17) are empty with first
Chamber (15) is connected, and the third cavity (19) is connected with the second cavity (17), the 4th cavity (21) and third cavity
(19) be connected, the inner cavity of first cavity (15) is provided with the first damping spool (16), second cavity (17) it is interior
Chamber is provided with the second damping spool (18), and the inner cavity of the third cavity (19) is provided with third damping spool (20), and described the
The inner cavity of four cavitys (21) is provided with the 4th damping spool (22).
2. a kind of pile-up valve air guide path control system according to claim 1, it is characterised in that: the solenoid valve (23)
Model P000-303-P53, the model ALT026-9 of the electromagnetic valve core (14).
3. a kind of pile-up valve air guide path control system according to claim 1, it is characterised in that: the first damping spool
(16) diameter is point two millimeter, and the diameter of second damping spool (18) is 0. 1 millimeters, the third orifice valve
The diameter of core (20) is nought point four millimeter, and the diameter of the 4th damping spool (22) is 0. 3 millimeters, first damping
Spool (16), the second damping spool (18), third damping spool (20) and the material of the 4th damping spool (22) are SUS404
Stainless steel.
4. a kind of pile-up valve air guide path control system according to claim 1, it is characterised in that: the half of the plug wire (24)
Diameter is 0. 125 millimeters, and the material of the plug wire (24) is SUS404 stainless steel, and the plug wire (24) connects with the first gas circuit
The junction of mouth (5) and the second air-path interface (8) is sealed using thread locking adhesive.
5. a kind of pile-up valve air guide path control system according to claim 1, it is characterised in that: first thread straight-through
(2), the specification of the second thread straight-through (6) and third thread straight-through (7) is SPC06-01, the 4th thread straight-through (13)
Specification is SPC10-02, first thread straight-through (2), the second thread straight-through (6), third thread straight-through (7) and the 4th screw thread
The junction of straight-through (13) is sealed using thread locking adhesive.
6. a kind of pile-up valve air guide path control system according to claim 1, it is characterised in that: first water route interface
Conduit (3) and the material of the second water route interface conduit (11) are LY12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810874228.1A CN108999822B (en) | 2018-08-03 | 2018-08-03 | Integrated valve gas guide path control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810874228.1A CN108999822B (en) | 2018-08-03 | 2018-08-03 | Integrated valve gas guide path control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108999822A true CN108999822A (en) | 2018-12-14 |
| CN108999822B CN108999822B (en) | 2020-03-27 |
Family
ID=64594982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810874228.1A Active CN108999822B (en) | 2018-08-03 | 2018-08-03 | Integrated valve gas guide path control system |
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| Country | Link |
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| CN (1) | CN108999822B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264478A (en) * | 1998-03-17 | 1999-09-28 | Asano Kenkyusho:Kk | Integrated pneumatic valve for thermoforming machine |
| US6546961B2 (en) * | 2000-08-01 | 2003-04-15 | Kitz Sct Corporation | Integrated gas control device |
| AU2004203137A1 (en) * | 2003-08-19 | 2005-03-10 | Mac Valves, Inc. | Solenoid Actuated Pneumatic Valve with an Integrated Pass-Through and a Quick Mount Body |
| CN201277142Y (en) * | 2008-10-23 | 2009-07-22 | 武汉聚能电气有限公司 | Integration type pneumatic brake control device |
| CN103775725A (en) * | 2014-02-20 | 2014-05-07 | 特福隆集团有限公司 | Pneumatic control operation module |
| CN205155238U (en) * | 2015-12-07 | 2016-04-13 | 中国北方车辆研究所 | Gas circuit change -over valve |
-
2018
- 2018-08-03 CN CN201810874228.1A patent/CN108999822B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11264478A (en) * | 1998-03-17 | 1999-09-28 | Asano Kenkyusho:Kk | Integrated pneumatic valve for thermoforming machine |
| US6546961B2 (en) * | 2000-08-01 | 2003-04-15 | Kitz Sct Corporation | Integrated gas control device |
| AU2004203137A1 (en) * | 2003-08-19 | 2005-03-10 | Mac Valves, Inc. | Solenoid Actuated Pneumatic Valve with an Integrated Pass-Through and a Quick Mount Body |
| CN201277142Y (en) * | 2008-10-23 | 2009-07-22 | 武汉聚能电气有限公司 | Integration type pneumatic brake control device |
| CN103775725A (en) * | 2014-02-20 | 2014-05-07 | 特福隆集团有限公司 | Pneumatic control operation module |
| CN205155238U (en) * | 2015-12-07 | 2016-04-13 | 中国北方车辆研究所 | Gas circuit change -over valve |
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| Publication number | Publication date |
|---|---|
| CN108999822B (en) | 2020-03-27 |
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