CN104896140B - Oil gas linkage switching valve and its working method - Google Patents

Oil gas linkage switching valve and its working method Download PDF

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Publication number
CN104896140B
CN104896140B CN201510318812.5A CN201510318812A CN104896140B CN 104896140 B CN104896140 B CN 104896140B CN 201510318812 A CN201510318812 A CN 201510318812A CN 104896140 B CN104896140 B CN 104896140B
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CN
China
Prior art keywords
valve
valve plate
handle
microswitch
blast tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201510318812.5A
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Chinese (zh)
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CN104896140A (en
Inventor
李丽容
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Li Lirong
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Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201510318812.5A priority Critical patent/CN104896140B/en
Priority to CN201711063239.3A priority patent/CN107829834A/en
Priority to CN201711063605.5A priority patent/CN107631055A/en
Priority to CN201711063237.4A priority patent/CN107781456A/en
Priority to CN201711064288.9A priority patent/CN107830204A/en
Priority to CN201711064286.XA priority patent/CN107795710A/en
Publication of CN104896140A publication Critical patent/CN104896140A/en
Application granted granted Critical
Publication of CN104896140B publication Critical patent/CN104896140B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/0655—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with flat slides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • F02D19/0676—Multi-way valves; Switch-over valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

A kind of oil gas linkage switching valve and its working method, it includes valve body, valve plate, microswitch and handle, fuel gallery and blast tube are horizontally arranged with valve body, valve plate installation passage is vertically arranged with valve body, valve plate installation passage extends transversely through fuel gallery and blast tube, and a seat board is connected with the outer wall of valve body；Valve plate is located in valve plate installation passage, and a valve opening, mobile valve plate are provided with valve plate, and valve opening can communicate with fuel gallery or blast tube, and the control terminal of valve plate stretches out valve body；Microswitch is arranged on seat board, and handle hinged seat is provided with seat board；Handle is hinged on handle hinged seat, and the seesaw on microswitch can be suppressed or unclamped to the control terminal linkage of middle handle and valve plate, rotational handle, handle.When valve opening communicates with fuel gallery, microswitch is powered；When valve opening communicates with blast tube, microswitch power-off.Carburetor oil is realized by rotational handle can and switched with the moment of gas two states, it is easy to operate.

Description

Oil gas linkage switching valve and its working method
Technical field
The present invention relates to a kind of oil gas linkage switching valve and its working method, the double fuel for being mainly used in oil-gas two-way is sent out In motivation.
Background technology
Dual fuel engine is that one kind can use Fuel Petroleum and LP gas fuel as fuel novel electricity generator, It has high-efficiency low-pollution draining technology feature, there is good development prospect.
Existing double fuel engine unit when in use, because burnt gas switch and fuel cock position are closer to, and There is no safeguard procedures, often occur burnt gas switch and fuel oil oil circuit breaker while the situation being opened because of the maloperation of user, Different fuel enters engine mixed combustion simultaneously, can cause engine operation irregularity, fluctuation of service, and can produce uneasiness Full flame etc., causes to have a strong impact on to the security performance of generating set.
In order to solve the above problems, those skilled in the art devise a kind of double fuel engine unit switching mechanism（Patent Number be 2,014 2 0141774. 1）, it includes：Panel, the appropriate location for being installed on engine；LPG rotary switches；Fuel oil Oil circuit breaker；The panel is respectively provided with stopper slot at two lateral margins up and down, and a lock is set in each stopper slot；Switch handle, It is stuck in by the lock in the stopper slot；The LPG rotary switches and fuel oil oil circuit breaker are fixed on the panel side by side The same face；The another side of the panel is additionally provided with a microswitch, solenoid valve controller and connecting line, on the microswitch With a seesaw, the seesaw can be suppressed or unclamp by sliding the switching handle；Fuel oil oil circuit breaker and LPG constructions of switch are formed A kind of mistake proofing design, can ensure that two switches can not be opened simultaneously, prevent user's faulty operation and cause two kinds of different combustions Material enters blender simultaneously, avoids and causes the situation of generator abnormal work to occur.
Above-mentioned double fuel engine unit switching mechanism is only a kind of mistake proofing design, although it can ensure two switches not by Open simultaneously, but it once switches the multi-step operation for needing to switch over handle and switch so that the switching of fuel oil and combustion gas Operation becomes sufficiently complex, and switch speed is slow.
The content of the invention
Based on above-mentioned the deficiencies in the prior art, the present invention provides a kind of oil gas linkage switching valve, and the device can not only be kept away Exempt from fuel cock and burnt gas switch while be opened, additionally it is possible to realize being switched fast for fuel oil and combustion gas, and only need once to grasp Act, operation is very easy.
The oil gas linkage switching valve of the present invention mainly includes valve body, valve plate, microswitch and handle.Wherein：
Fuel gallery and blast tube are horizontally arranged with the valve body, the oil inlet end of the fuel gallery is connected with oil-feed Pipe joint, fuel-displaced section of the fuel gallery are connected with flowline connection to subsea；The inlet end of the blast tube is connected with air inlet pipe Joint, the outlet side of the blast tube are connected with outlet pipe joint, valve plate installation passage, institute are vertically arranged with the valve body State valve plate installation passage and extend transversely through fuel gallery and blast tube, a seat board is connected with the outer wall of the valve body.
The valve plate is located in valve plate installation passage, and a valve opening, mobile valve plate, the valve opening are provided with the valve plate It can be communicated with fuel gallery or blast tube, the control terminal of the valve plate stretches out valve body.
The microswitch is arranged on seat board, and handle hinged seat is provided with the seat board.
The handle is hinged on handle hinged seat, the control terminal linkage of the middle handle and valve plate, rotational handle, institute Seesaw on microswitch can be suppressed or unclamp by stating handle.
In order that valve plate can be accurately positioned during switching, it is additionally provided with the valve body for positioning valve plate Location structure.The location structure have it is a variety of, can be specific selected according to being actually needed.In order to make it easy to understand, we lift here One example of which illustrates that in the present invention, described location structure is specially：One positioning screw hole, institute are set on valve body State positioning screw hole and be located at valve plate control terminal side, positioning bead, spring and holding screw are installed in the positioning screw hole；The valve Location dimples are provided with plate.
Realize the control terminal linkage of middle handle and valve plate connection scheme have it is a variety of, can be according to being actually needed specific choosing It is fixed.In order to make it easy to understand, we lift one example of which explanation here, in the present invention, the middle handle is provided with length Circular hole, a through hole is provided with the control terminal of the valve plate, a stud, the stud are equipped between the through hole and slotted hole Both ends be mounted on nut.
The structural form of valve body can be with varied.But integrally-built compactedness is considered, in the present embodiment, by institute State valve body 1 and be designed as cuboid valve body.
In the present invention, the seat board is L-type seat board.
In terms of existing technologies, an only valve opening on the valve plate of oil gas linkage switching valve, in the unit interval only It may be communicated with one in fuel gallery and blast tube, can directly avoid fuel gallery and blast tube while be beaten Open, avoid different fuel while enter engine mixed combustion, ensure that normal work and the stable operation of engine, simultaneously Also improve the security performance of generating set.In addition, the fuel gallery of oil gas linkage switching valve and blast tube are by same Valve plate controls, and valve plate mutually links with microswitch, only need to operate a handle can while realize coordinated signals, oil Gas handover operation is very quick, easy.
Brief description of the drawings
Fig. 1 is the first front view of oil gas linkage switching valve in embodiment.
Fig. 2 is along the sectional view of A-A sights in Fig. 1.
Fig. 3 is the close-up schematic view at I in Fig. 2.
Fig. 4 is the sectional view of valve body in embodiment.
Fig. 5 is the sectional view of valve plate in embodiment.
Fig. 6 is the front view of valve plate in embodiment.
Fig. 7 is the structural representation of handle in embodiment.
Fig. 8 is the second front view of oil gas linkage switching valve in embodiment.
Fig. 9 is along the sectional view of B-B sights in Fig. 7.
Label declaration：1- valve body 2- valve plate 3- microswitch 4- handle 5- fuel galleries 6- blast tubes 7- inlet connector 8- flowline connection to subsea 9- air inlet pipe joint 10- outlet pipe joint 11- valve plate installation passages 12- seat board 13- valve opening 14- handle hinged seat 15- seesaw 16- location structure 17- positioning screw holes 18- is positioned Pearl 19- spring 20- holding screw 21- location dimples 22- slotted hole 23- through hole 24- stud 25- nuts.
Embodiment
In order that the above-mentioned technology contents and construction features of the present invention can be more easily by persons skilled in the art institutes Understand, below in conjunction with the accompanying drawings with technical essential to the application further instruction.
As shown in Figure 1 and Figure 7, Fig. 1 is the first front view of oil gas linkage switching valve in embodiment, and Fig. 7 is in embodiment Second front view of oil gas linkage switching valve.The oil gas linkage switching valve of the present invention mainly includes valve body 1, valve plate 2, microswitch 3 and handle 4.Wherein：
The structural form of valve body can be with varied.But integrally-built compactedness is considered, in the present embodiment, by institute State valve body 1 and be designed as cuboid valve body, as shown in Figure 1, Figure 2 and Figure 4.
As shown in figure 4, being horizontally arranged with fuel gallery 5 and blast tube 6 on the valve body 1, the fuel gallery 5 is entered Oily end is connected with inlet connector 7, and fuel-displaced section of the fuel gallery 5 is connected with flowline connection to subsea 8；The blast tube 6 Inlet end is connected with air inlet pipe joint 9, and the outlet side of the blast tube is connected with outlet pipe joint 10, longitudinal direction on the valve body Valve plate installation passage 11 is provided with, the valve plate installation passage 11 extends transversely through fuel gallery 5 and blast tube 6, the valve body Outer wall on be connected with a seat board 12.
During actual use, described fuel gallery 5 and blast tube 6 are not what is uniquely determined, according to tool Both needs of body can exchange.Former blast tube is made into fuel gallery, while blast tube is made into former fuel gallery.
As it can be seen in figures 5 and 6, the valve plate 2 is located in valve plate installation passage 11, a valve opening is provided with the valve plate 2 13, mobile valve plate, the valve opening 13 can communicate with fuel gallery 5 or blast tube 6, the control terminal of the valve plate 2（Valve in figure The right part of plate）Stretch out valve body 1.
As shown in Figure 1 and Figure 7, the microswitch 3 is arranged on seat board 12, and in the present invention, the seat board 12 is L-type Seat board.During installation, the handle that sticks up of the microswitch must be towards handle 4.
As shown in Figure 1 and Figure 7, handle hinged seat 14 is provided with the seat board.The lower end of the handle 4 is hinged on handle On hinged seat 14, the middle part of handle 4 and the control terminal of valve plate 2 link, and rotational handle 4, and the handle 4 can suppress or pine Open the seesaw 15 on microswitch 3.
In order that valve plate can be accurately positioned during switching, as shown in Figures 2 and 3, also set up on the valve body 1 There is the location structure 16 for normal valve plate.The location structure have it is a variety of, can be specific selected according to being actually needed.In order to just In understanding, we lift one example of which explanation here, and in the present invention, described location structure is specially：On valve body One positioning screw hole 17 is set, the positioning screw hole is located at valve plate control terminal side, be provided with the positioning screw hole positioning bead 18, Spring 19 and holding screw 20；Location dimples 21 are provided with the valve plate, the location dimples 21 there are two.When positioning bead 18 When dropping into location dimples 21, show that valve plate 2 moves into place.
Realize the control terminal linkage of middle handle and valve plate connection scheme have it is a variety of, can be according to being actually needed specific choosing It is fixed.In order to make it easy to understand, we lift one example of which explanation here, as shown in Fig. 1 and Fig. 2, Fig. 7 and Fig. 8, in the present invention In, the middle part of handle 4 is provided with slotted hole 22, and a through hole 23, the through hole and length are provided with the control terminal of the valve plate 2 A stud 24 is equipped between circular hole, the both ends of the stud are mounted on nut 25.
The working method of above-mentioned oil gas linkage switching valve：
During installation, the inlet connector of fuel gallery and flowline connection to subsea are connected respectively in-line and carburetion In device oil feed line, the air inlet pipe joint of blast tube and outlet pipe joint are connected respectively air inlet pipeline and carburetor In supply air line, then microswitch and the magnetic valve on the carburetor be electrically connected, to control electromagnetic valve work.Change Oily device is connected with engine.
When engine needs to use gasoline, the handle 4 of oil gas linkage switching valve is inwardly promoted, valve plate 2 is installed along valve plate Passage 11 is moved inward, and until valve opening 13 communicates with fuel gallery 5, after valve plate 2 moves into place, location structure can be provided and carried in place Show, and limit valve plate 2 and continue to move to；At the same time, blast tube 6 is ended by valve plate 2, and the seesaw of microswitch is also by hand The bar portion pressing of handle, electric signal passes to magnetic valve, the needle of magnetic valve is retracted by microswitch, allows oil circuit in carburetor to lead to Road, carburetor is to engine oil.
When engine needs to use combustible gas（Liquefied gas or natural gas etc.）When, pull out oil gas linkage switching valve handle 4, valve plate 2 is displaced outwardly along valve plate installation passage 11, until valve opening 13 communicates with blast tube 6, after valve plate 2 moves into place, Location structure can be provided and prompted in place, and limited valve plate 2 and continued to move to；At the same time, fuel gallery 5 is ended by valve plate 2, and micro- The seesaw of dynamic switch is separated with handle, and electric signal is passed to magnetic valve, ejects the needle of magnetic valve by microswitch, is blocked Oil circuit in carburetor, carburetor supply combustible gas to engine.
It should be added that above-mentioned carburetor is oil-gas two-way carburetor, above-mentioned magnetic valve is normally closed type electricity Magnet valve.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills Art field, it is included in the scope of patent protection of the present invention.

Claims (4)

  1. The switching valve 1. a kind of oil gas links, it mainly includes valve body, valve plate, microswitch and handle, it is characterised in that：
    Fuel gallery and blast tube are horizontally arranged with the valve body, the oil inlet end of the fuel gallery is connected with oil inlet pipe and connect Head, fuel-displaced section of the fuel gallery are connected with flowline connection to subsea, and the inlet end of the blast tube is connected with air inlet pipe joint, The outlet side of the blast tube is connected with outlet pipe joint；
    Valve plate installation passage is vertically arranged with the valve body, the valve plate installation passage extends transversely through fuel gallery and combustion gas is led to Road；The valve plate is located in valve plate installation passage, a valve opening is provided with the valve plate, mobile valve plate, the valve opening can Communicated with fuel gallery or blast tube, the control terminal of the valve plate stretches out valve body；Positioning screw hole, institute are provided with the valve body State positioning screw hole and be located at valve plate control terminal side, positioning bead, spring and holding screw are installed in the positioning screw hole；The valve Location dimples are provided with plate；
    A seat board is connected with the outer wall of the valve body, the seat board is L-type seat board, and the microswitch is arranged on seat board, Handle hinged seat is provided with the seat board；The handle is hinged on handle hinged seat, the control of the middle handle and valve plate The seesaw on microswitch can be suppressed or unclamped to end linkage processed, rotational handle, the handle.
  2. The switching valve 2. oil gas according to claim 1 links, it is characterised in that：The middle handle is provided with slotted hole, A through hole is provided with the control terminal of the valve plate, is equipped with a stud between the through hole and slotted hole, the two of the stud End is mounted on nut.
  3. The switching valve 3. oil gas according to claim 1 links, it is characterised in that：The valve body is cuboid valve body.
  4. A kind of 4. working method of oil gas linkage switching valve as described in one of claim 1-3, it is characterised in that：
    （1）When engine needs to use gasoline, the handle of oil gas linkage switching valve is inwardly promoted, makes valve plate along valve plate installation passage Move inward, until valve opening communicates with fuel gallery, after valve plate moves into place, location structure can be provided and prompted in place, and be limited Valve plate continues to move to；At the same time, blast tube is ended by valve plate, and the seesaw of microswitch is also pressed by the bar portion of handle Pressure, electric signal passes to magnetic valve, the needle of magnetic valve is retracted by microswitch, allows oil circuit path in carburetor, carburetor To engine oil, the magnetic valve is normally closed solenoid valve；
    （2）When engine needs to use combustible gas, the handle of oil gas linkage switching valve is pulled out, valve plate is installed along valve plate logical Road is displaced outwardly, and until valve opening communicates with blast tube, after valve plate moves into place, location structure can be provided and prompted in place, and be limited Valve plate processed continues to move to；At the same time, fuel gallery is ended by valve plate, and the seesaw of microswitch is separated with handle, fine motion Electric signal is passed to magnetic valve by switch, ejects the needle of magnetic valve, blocks the oil circuit in carburetor, carburetor is to engine For combustible gas.
CN201510318812.5A 2015-06-12 2015-06-12 Oil gas linkage switching valve and its working method Expired - Fee Related CN104896140B (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN201510318812.5A CN104896140B (en) 2015-06-12 2015-06-12 Oil gas linkage switching valve and its working method
CN201711063239.3A CN107829834A (en) 2015-06-12 2015-06-12 A kind of control valve of oil gas carburetor
CN201711063605.5A CN107631055A (en) 2015-06-12 2015-06-12 The linkage switching valve and its method of work of a kind of oil gas carburetor
CN201711063237.4A CN107781456A (en) 2015-06-12 2015-06-12 A kind of switching valve of oil gas carburetor
CN201711064288.9A CN107830204A (en) 2015-06-12 2015-06-12 A kind of switching valve of oil gas carburetor
CN201711064286.XA CN107795710A (en) 2015-06-12 2015-06-12 A kind of change over valve of oil gas carburetor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510318812.5A CN104896140B (en) 2015-06-12 2015-06-12 Oil gas linkage switching valve and its working method

Related Child Applications (5)

Application Number Title Priority Date Filing Date
CN201711063239.3A Division CN107829834A (en) 2015-06-12 2015-06-12 A kind of control valve of oil gas carburetor
CN201711064288.9A Division CN107830204A (en) 2015-06-12 2015-06-12 A kind of switching valve of oil gas carburetor
CN201711063605.5A Division CN107631055A (en) 2015-06-12 2015-06-12 The linkage switching valve and its method of work of a kind of oil gas carburetor
CN201711063237.4A Division CN107781456A (en) 2015-06-12 2015-06-12 A kind of switching valve of oil gas carburetor
CN201711064286.XA Division CN107795710A (en) 2015-06-12 2015-06-12 A kind of change over valve of oil gas carburetor

Publications (2)

Publication Number Publication Date
CN104896140A CN104896140A (en) 2015-09-09
CN104896140B true CN104896140B (en) 2017-11-14

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Family Applications (6)

Application Number Title Priority Date Filing Date
CN201711064288.9A Pending CN107830204A (en) 2015-06-12 2015-06-12 A kind of switching valve of oil gas carburetor
CN201711063605.5A Pending CN107631055A (en) 2015-06-12 2015-06-12 The linkage switching valve and its method of work of a kind of oil gas carburetor
CN201711063239.3A Pending CN107829834A (en) 2015-06-12 2015-06-12 A kind of control valve of oil gas carburetor
CN201510318812.5A Expired - Fee Related CN104896140B (en) 2015-06-12 2015-06-12 Oil gas linkage switching valve and its working method
CN201711063237.4A Pending CN107781456A (en) 2015-06-12 2015-06-12 A kind of switching valve of oil gas carburetor
CN201711064286.XA Pending CN107795710A (en) 2015-06-12 2015-06-12 A kind of change over valve of oil gas carburetor

Family Applications Before (3)

Application Number Title Priority Date Filing Date
CN201711064288.9A Pending CN107830204A (en) 2015-06-12 2015-06-12 A kind of switching valve of oil gas carburetor
CN201711063605.5A Pending CN107631055A (en) 2015-06-12 2015-06-12 The linkage switching valve and its method of work of a kind of oil gas carburetor
CN201711063239.3A Pending CN107829834A (en) 2015-06-12 2015-06-12 A kind of control valve of oil gas carburetor

Family Applications After (2)

Application Number Title Priority Date Filing Date
CN201711063237.4A Pending CN107781456A (en) 2015-06-12 2015-06-12 A kind of switching valve of oil gas carburetor
CN201711064286.XA Pending CN107795710A (en) 2015-06-12 2015-06-12 A kind of change over valve of oil gas carburetor

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CN (6) CN107830204A (en)

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CN113790285B (en) * 2021-09-02 2024-09-20 郑州顺安机电设备有限公司 Direction-dividing pneumatic gate valve, valve group system and control system

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CN104896140A (en) 2015-09-09
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CN107829834A (en) 2018-03-23
CN107631055A (en) 2018-01-26
CN107830204A (en) 2018-03-23

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