CN201705746U - Unidirectional speed regulation multi-way reversing valve group - Google Patents

Unidirectional speed regulation multi-way reversing valve group Download PDF

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Publication number
CN201705746U
CN201705746U CN2009202942098U CN200920294209U CN201705746U CN 201705746 U CN201705746 U CN 201705746U CN 2009202942098 U CN2009202942098 U CN 2009202942098U CN 200920294209 U CN200920294209 U CN 200920294209U CN 201705746 U CN201705746 U CN 201705746U
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CN
China
Prior art keywords
valve
passage
commutation
oil
control valve
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Expired - Fee Related
Application number
CN2009202942098U
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Chinese (zh)
Inventor
徐光德
陈启松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LUZHOU JIANGYANG CHANGJIANG HYDRAULIC PRESSURE TECHNOLOGY Co Ltd
Original Assignee
LUZHOU JIANGYANG CHANGJIANG HYDRAULIC PRESSURE TECHNOLOGY Co Ltd
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Priority to CN2009202942098U priority Critical patent/CN201705746U/en
Application granted granted Critical
Publication of CN201705746U publication Critical patent/CN201705746U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a unidirectional speed regulation multi-way reversing valve group, which is provided with a multi-way reversing valve group and is characterized in that a unidirectional speed regulation valve group is arranged in a main hole at the upper part of a reversing valve body (10) of the multi-way reversing valve group; a second channel (23-2) and an eighth channel (23-8) of an oil duct at the reversing position in the reversing valve body (10) are respectively communicated with an eleventh channel (23-11) and a twelfth channel (23-12) of the unidirectional speed regulation valve group in the main hole on the upper part of the valve body; the upper part of the reversing valve body (10) is provided with a first oil port (A) and a second oil port (B) which are respectively connected with oil paths between controlled hydraulic executive components outwards and are respectively communicated with the eleventh channel (23-11) and the twelfth channel (23-12) of the unidirectional speed regulation valve group in the main hole on the upper part of the valve body. Because an oil return speed regulation mode is adopted, certain back pressure is generated at the oil return path due to throttling so as to make the start impact of the hydraulic executive component small, and the operation is smoother. The utility model can be combined with other multi-way reversing valve groups with different control functions to form a widely applied novel hydraulic control component.

Description

A kind of unidirectional speed governing multiple directional control valve group
Technical field:
The utility model belongs to the hydraulic control device technical field, is specifically related to a kind of unidirectional speed governing multiple directional control valve group, and it is to use the special assembly that hydraulics is controlled and regulated the moving direction and the movement velocity of fluid.
Background technique:
In the existing hydraulic system that adopts multiple directional control valve control, be to the control type of flow stream velocity:
The one, in the oil circuit of executive component, install independent throttle valve (series flow control valve) composition speed regulating control oil circuit at multiple directional control valve additional, also to install a cover in addition additional as the two-way control of need.The defective of this control mode is that external component size is big, and the pipeline connection reliability is poor, and the external leakage possibility strengthens, and installs limited and inconvenient;
The 2nd, install a skeleton symbol Rectifier plate additional at the oil outlet place, to fix or adjustable oil inlet and oil return is two-way, its shortcoming is that degree of regulation is low, the mounting point is limited.Generally all adopt unidirectional meter out mode in this external hydraulic system, guaranteeing the stationarity of executive component operating mode motion, and realize rapid movement when reverse adopting the skeleton symbol Rectifier plate can't realize this requirement;
The 3rd, control openings of sizes between guiding valve and the valve body inside groove with feel and realize control by handling reversing slide valve movement velocity.Its shortcoming is the short about 2-4mm of command range, and control accuracy is poor, is difficult to hold with hand the conformity of movement velocity.And on hydraulic control, gas control mode, can't adopt.
The model utility content:
In order to overcome the deficiency of existing control oil channel form, the utility model discloses a kind of unidirectional speed governing multiple directional control valve group, the unidirectional series flow control valve that employing will improve after the design directly is integrated in the commutation valve body, combine together with original commutation function, constitute unidirectional speed governing commutation control oil channel, and can be at hydraulic fluid port A or two-way plug-in mounting in hydraulic fluid port B place or the unidirectional series flow control valve of unidirectional plug-in mounting.
The utility model is specifically by the following technical solutions:
A kind of unidirectional speed governing multiple directional control valve group, it has a multiple directional control valve group, also integrated in the commutation valve body of described multiple directional control valve group unidirectional series flow control valve group is installed.
In the described commutation valve body oil duct second channel of commutation position and the 8th passage respectively be installed in valve body top main aperture in the 11 passage and the 12 passage of unidirectional series flow control valve group communicate;
Commutation valve body top is provided with the first hydraulic fluid port A, the second hydraulic fluid port B, they outwards respectively with the hydraulic actuator of being controlled between oil circuit is connected, inside respectively be installed in valve body top main aperture in the 11 passage and the 12 passage of unidirectional series flow control valve group communicate;
On the bi-side of commutation valve body, be respectively equipped with public oil input channel the tenth passage, public off-load oil duct five-way road, neutral oil duct four-way and the 6th passage, public spill port first passage and the 9th passage, public attachment hole L1, L2, L3, L4; Above-mentioned public oil input channel the tenth passage is an asphalt channel in parallel, be arranged at the valve body medium position, it is communicated with the oil input channel of next valve group by third channel and the 7th passage in the valve body, and its function is with in third channel in the external hydraulic oil introducing valve body and the 7th passage and be transported in the oil input channel of next valve group; The five-way road is arranged at the middle part of commutation valve opening, when the selector valve group is in the neutral position, with neutral oil duct four-way and the 6th channel connection, for the off-load of pressure oil meta provides passage, the filler opening and the five-way road oil outlet of neutral oil duct four-way and the 6th passage oppositely are provided with; First passage and the 9th passage are drainback passage, are arranged at the two ends of commutation valve opening respectively, and its function is for being communicated with the oil return of this valve group A, B mouth, and provide passage for the oil return of other valve group; Public attachment hole L1, L2 are arranged at the top of valve body, and public attachment hole L3, L4 are arranged at the below of valve body, mounting stud when being used for fastening combination brake switch and proporting group.
The multiple directional control valve group comprises support, reversing slide valve, commutation valve body, baffle plate, spring seat, Returnning spring, end cap and locating column, the outside thread that utilizes locating column connects as one the internal thread of spring seat, Returnning spring and guiding valve, pack into and commutate in the bottom main aperture of valve body, two ends are equipped with baffle plate, end cap and support respectively, and pack into the star structure Sealing with double-sealing line, poly-polytetrafluoroethylsealed sealed circle.Be designed to the layout of nine slot type oil ducts in the bottom main aperture of described commutation valve body, to realize the commutation function of multiple slide valve function.
Unidirectional series flow control valve group is made up of two sleeving valve assemblies, symmetry be installed in the commutation valve body the top main aperture in the right and left, every cover valve assembly all comprises locking nut, thread bush, adjustable lever, collar, check valve spring, one-way valve and valve pocket; Described valve pocket is contained in the inner end of top main aperture, one-way valve is contained in the valve pocket, check valve spring is contained in the hole of one-way valve, adjustable lever one end is fixed in the unidirectional valve opening by collar, the adjustable lever the other end is connected with thread bush, thread bush screws in the top main aperture screw thread that is assemblied in the commutation valve body, and locking nut is equipped with in the outer end.
Advantage of the present utility model:
The utility model is by handling reversing slide valve and realize the conversion of oil circuit direction and to the simple control of hydraulic actuator speed.Can change the size of oily flow or close fully by the distance of regulating unidirectional series flow control valve group two ends adjustable lever, realize more accurately control movement velocity.
Wherein unidirectional series flow control valve group adopts the thread cartridge mode, organically blends with commutation function and becomes one, and has changed defectives such as to add inconvenience and volume that unidirectional series flow control valve brings big, and the pipeline connection reliability is poor, and installation conditions is limited.Have delicate structure, working pressure height, easy to adjust, safeguard convenient, can realize step-less adjustment to the hydraulic actuator movement velocity, and have series parallel connection oil circuit pattern and manually, hydraulic control, gas control, recoil reset etc. and to handle control mode, has that versatility is good, the advantage of applied range.
The commutation valve body is guaranteeing with pressure oilhole, spill port parting seal, to reduce zone of high pressure, valve body side lifting surface area under the long-pending enough situations of logical pasta as far as possible, eliminated between the valve body sheet and leaked, valve opening compressive deformation amount is little, and hydraulic card clamping force reduces, and guiding valve reversing maneuver power significantly reduces.Changed original high pressure multiple directional control valve the height nip is sealed into one, in 25~31.5Mpa zone of high pressure, the valve body amount of deformation is big, and leakage rate is big between sheet, raises to press difficulty, the defective that steering force is big.
The selector valve group adopts guiding valve zero external leakage design, is low pressure area with the first passage and the 9th channels designs at main valve hole two ends, adopts the X-shaped sealing configuration to form the two seals line, and installs poly-polytetrafluoroethylsealed sealed circle additional; Slide-valve surface adopts Du Ying Chrome technology, has improved surface flatness, has reduced frictional force.Changed original multiple directional control valve because of structural design unreasonable or the sealing early failue, the defective that external leakage happens occasionally.
The utility model can be widely used in pile pressing machine, engineering driller, high-altitude operation vehicle, environmental sanitation car, wrecker, railway machinery, tunnel machine, energy machinery and other mechanical link that needs movement velocity is carried out step-less adjustment control in the hydraulic actuator movement process.
According to the usage requirement of all kinds of main frames, the function combinations of the utility model and other integrated change valve group is that one constitutes the control oil channel with various ways and realizes control requirement to all kinds of hydraulic machineries.
Description of drawings:
Fig. 1 is the sectional structure chart of this unidirectional speed governing multiple directional control valve group.
Fig. 2 is the longitudinal profile structural drawing of this unidirectional speed governing multiple directional control valve group;
Fig. 2 A is the local amplification profile of guiding valve sealing configuration.
Fig. 3 is this unidirectional speed governing multiple directional control valve group horizontal section structural drawing.
Fig. 4 is the hydraulic work schematic diagram of this unidirectional speed governing multiple directional control valve group.
Among Fig. 1: the 1-support, the 2-guiding valve, 3-first locking nut 3,17-second locking nut 17,4-first thread bush 4,16-second thread bush, 5-first adjustable lever, 15-second adjustable lever, 6-first collar 6,14-second collar 14,7-first check valve spring, 13-second check valve spring, 8-first one-way valve, 12-second one-way valve, 9-first valve pocket, 11-second valve pocket, the 10-valve body that commutates, the 18-baffle plate, the 19-spring seat, the 20-Returnning spring, the 21-end cap, the 22-locating column, the 23-1-first passage, the 23-2-second channel, the 23-3-third channel, the 23-4-four-way, 23-5-five-way road, 23-6-the 6th passage, 23-7-the 7th passage, 23-8-the 8th passage, 23-9-the 9th passage, 23-10-the tenth passage, 23-11-the 11 passage, 23-12-the 12 passage, the 24-1 parallel port, bit port among the 24-2-, the 24-3-low-pressure channel
Embodiment:
Describe structure of the present utility model in detail below in conjunction with accompanying drawing:
Referring to Fig. 1, Fig. 2 and Fig. 3, this unidirectional speed governing multiple directional control valve group is by unidirectional series flow control valve being integrated in the commutation valve body, combine together with original commutation function, constitute reversing oil circuit, by handling that reversing slide valve is realized the oil circuit conversion and to executive component to-and-fro motion or the speed controlling that rotatablely moves with unidirectional speed regulating control function.It has a multiple directional control valve group and a unidirectional series flow control valve group, and two valve groups are assemblied in respectively in the bottom main aperture and top main aperture of commutation valve body 10.
Wherein the multiple directional control valve group comprises support 1, reversing slide valve 2, commutation valve body 10, baffle plate 18, spring seat 19, Returnning spring 20, end cap 21 and locating column 22, utilize locating column 22 to connect as one by the internal thread of outside thread and reversing slide valve 2, spring seat 19 and Returnning spring 20 are housed between them, reversing slide valve (2) is packed into and is commutated in the bottom main aperture of valve body 10, two ends are equipped with baffle plate 18, end cap 21 and support 1 respectively, the X-shaped Sealing of packing at the valve opening two ends, poly-polytetrafluoroethylsealed sealed circle.
Unidirectional series flow control valve group comprises first locking nut 3 and second locking nut, 17, the first thread bushs 4 and second thread bush 15, first adjustable lever 5 and second adjustable lever 16, first collar 6 and second collar 14, first check valve spring 7 and second check valve spring 13, first one-way valve 8 and second one-way valve 12, first valve pocket 9 and second valve pocket 11.Valve pocket 9 and 11 is loaded onto respectively earlier in the top main aperture that Sealing reinstalls commutation valve body 10, check valve spring 7 and 13 is packed in one-way valve 8 and 12 holes, be fixed on the small stair place of first adjustable lever 5 and second adjustable lever 15 in the hole of first one-way valve 8 and second one-way valve 12 with collar, the Sealing of packing in the big stepped slot of first adjustable lever 5 and second adjustable lever 15 screws in threaded end in first thread bush 4 and second thread bush 16, and puts on first locking nut 3 and second locking nut 17 respectively.First thread bush 4 and second thread bush 16 are loaded onto in the top main aperture screw thread of Sealing screw-in commutation valve body 10.
On the bi-side of commutation valve body 10, be respectively equipped with public oil input channel the tenth passage 23-10, common pressure oil duct five-way road 23-5, neutral oil duct four-way 23-4 and the 6th passage 23-6, public spill port first passage 23-1 and the 9th passage 23-9, public attachment hole L1, L2, L3, L4, with realize the combination between the valve group and publicly advance, transmission and the introducing of this valve group pressure oil and the drainage of oil return of drainback passage; In commutation valve body 10 bottom main apertures, be designed to the arrangement of nine slot type oil ducts, to realize the commutation function of multiple slide valve function.The second channel 23-2 and the 8th passage of commutation position in the commutation valve body 10 are communicated with the 11 passage 23-11 and the 12 passage 23-12 of unidirectional series flow control valve group respectively, to realize regulating the function of oily flow velocity degree; Valve body 10 tops are provided with the first hydraulic fluid port A, the second hydraulic fluid port B, with realize with the hydraulic actuator of being controlled between oil circuit be connected.
Nominal pressure height, the nominal flow rate of this unidirectional speed governing multiple directional control valve group are big, can realize from being closed to the step-less adjustment in peak rate of flow interval.Press the inside nominal diameter of multiple directional control valve: 15mm, 22mm, 28mm, nominal flow rate is respectively: 100L/min, 180L/min, 280L/min, nominal pressure: 31.5Mpa, flow adjustment range 0 → nominal flow rate.
Working principle:
When reversing slide valve 2 moves right, sealed the off-load runner of four-way 23-4 and the 6th passage 23-6 and the 5th interchannel 23-5, pressure oil enters into the 11 passage 23-10 of the unidirectional series flow control valve assembly that is installed in commutation valve body 10 top left ends from the tenth passage 23-10 to second channel 23-2 through third channel 23-3, pressure oil acts on the end face of first one-way valve 8, compress first check valve spring 7 and form maximum open to left movement, fluid enters executive component one end active chamber through the first hydraulic fluid port A; The oil return of executive component the other end active chamber enters among the 12 passage 23-12 of the unidirectional series flow control valve assembly of right-hand member through the second hydraulic fluid port B, oil return enters in the valve opening by the aperture of second one-way valve 12, its pressure acts on the useful area at second one-way valve, 12 rear portions and overcomes return oil pressure power with spring force, make second one-way valve 12 to left movement, make second collar of installing in one-way valve 12 endoporus 14 withstand the step of second adjustable lever 15, driving fit place of second one-way valve 12 and second valve pocket 11 is thrown off and the formation permanent opening, oil return is flowed out through the 8th passage to the nine passages from the 12 passage 23-12, and executive component produces motion.By adjusting the distance of second adjustable lever 15, can regulate the size of second one-way valve 12 and second valve pocket, 11 driving fit place openings, recirculating oil quantity is controlled, realize the oil return speed of a direction of executive component is regulated or closed.
When reversing slide valve 2 is moved to the left, sealed the off-load runner between four-way 23-4 and the 6th passage 23-6 and five-way road 23-5, pressure oil enters into the 12 passage 23-12 of the unidirectional series flow control valve assembly that is installed in commutation valve body 10 top main aperture right-hand members from the tenth passage 23-10 through the 7th passage 23-7 to the eight passage 23-8, pressure oil acts on the end face of second one-way valve 12, compress second check valve spring 13 and form maximum open to left movement, fluid enters the other end active chamber of executive component through the second hydraulic fluid port B; The oil return of executive component one end active chamber enters among left end series flow control valve assembly the 11 passage 23-11 through the first hydraulic fluid port A, oil return enters in the valve opening by the aperture of first one-way valve 8, its pressure acts on the useful area at one-way valve 8 rear portions and overcomes return oil pressure power with spring force, first one-way valve 8 is moved right, make first collar of installing in first one-way valve, 8 endoporus 6 withstand the step of first adjustable lever 5, driving fit place of first one-way valve 8 and first valve pocket 9 is thrown off and the formation permanent opening, oil return is flowed out to first passage 23-1 through second channel 23-2 from the 11 passage 23-11, and executive component produces reversing motion.By adjusting the distance of first adjustable lever 5, can regulate the size of first one-way valve 8 and valve pocket 9 driving fit place openings, recirculating oil quantity is controlled, realize the oil return speed of executive component other direction is regulated or closed.
Figure 4 shows that commutation valve body in parallel, O type slide valve function.When reversing slide valve was in arbitrary position, public oil input channel the tenth passage 23-10 was communicated with the parallel port 24-1 of front end and rear end selector valve group.When reversing slide valve 2 was in the neutral position, reversing slide valve 2 actuator port under the effect of Returnning spring 20 was in closure state, the executive component stop motion.The in the past middle bit port 24-2 of the fluid that bit port 24-2 comes in end valve group end valve group after four-way 23-4 and the 6th passage 23-6 enter by five-way road 23-5.
In addition, parallel connection type or serial type selector valve group all can be selected two unidirectional series flow control valve groups of group of dress or the unidirectional series flow control valve group of single group as required.

Claims (3)

1. unidirectional speed governing multiple directional control valve group, it has a multiple directional control valve group, it is characterized in that: in the top main aperture of the commutation valve body (10) of described multiple directional control valve group unidirectional series flow control valve group is installed also;
In the described commutation valve body (10) the oil duct second channel (23-2) of commutation position and the 8th passage (23-8) respectively be installed in valve body top main aperture in the 11 passage (23-11) and the 12 passage (23-12) of unidirectional series flow control valve group communicate;
The top of described commutation valve body (10) is provided with first hydraulic fluid port (A), second hydraulic fluid port (B), they outwards respectively with the hydraulic actuator of being controlled between oil circuit is connected, inside respectively be installed in valve body top main aperture in the 11 passage (23-11) and the 12 passage (23-12) of unidirectional series flow control valve group communicate;
On the bi-side of commutation valve body (10), be respectively equipped with public oil input channel the tenth passage (23-10), public off-load oil duct five-way road (23), neutral oil duct four-way (23-4) and the 6th passage (23-6), public spill port first passage (23-1) and the 9th passage (23-9), public attachment hole (L1, L2, L3, L4); Described public oil input channel the tenth passage (23-10) is an asphalt channel in parallel, is arranged at the valve body medium position, and it is communicated with the oil input channel of multiple directional control valve group by third channel (23-3) and the 7th passage (23-7) in the valve body; Public off-load oil duct five-way road (23-5) is arranged at the middle part of commutation valve opening, when the multiple directional control valve group is in the neutral position, be communicated with neutral oil duct four-way (23-4) and the 6th passage (23-6), the filler opening and five-way road (23-5) oil outlet of neutral oil duct four-way (23-4) and the 6th passage (23-6) oppositely are provided with; First passage (23-1) and the 9th passage (23-9) are drainback passage, are arranged at the two ends of commutation valve opening respectively, are communicated with the oil return of first hydraulic fluid port (A) and second hydraulic fluid port (B) of this unidirectional speed governing multiple directional control valve group; Public attachment hole (L1, L2) is arranged at the top of valve body, and public attachment hole (L3, L4) is arranged at the below of valve body, by fastening unidirectional speed governing multiple directional control valve group of stud bolt.
2. unidirectional speed governing multiple directional control valve group according to claim 1, it is characterized in that: described multiple directional control valve group comprises: support (1), reversing slide valve (2), commutation valve body (10), baffle plate (18), spring seat (19), Returnning spring (20), end cap (21) and locating column (22); Locating column (22) connects as one by the internal thread of outside thread and reversing slide valve (2), spring seat (19) and Returnning spring (20) are housed between them, reversing slide valve (2) pack into the commutation valve body (10) the bottom main aperture in, baffle plate (18), end cap (21) and support (1) are housed respectively at the two ends of main aperture, are incorporated with X-shaped Sealing, poly-polytetrafluoroethylsealed sealed circle in the valve opening outermost end;
Be designed to the layout of nine slot type oil ducts in the bottom main aperture of described commutation valve body (10).
3. unidirectional speed governing multiple directional control valve group according to claim 1 and 2, it is characterized in that: described unidirectional series flow control valve group is made up of two sleeving valve assemblies, symmetry be installed in the commutation valve body (10) the top main aperture in the right and left, every cover valve assembly all comprises locking nut, thread bush, adjustable lever, collar, check valve spring, one-way valve and valve pocket; Described valve pocket is assemblied in the inner end of top main aperture, one-way valve is contained in the valve pocket, check valve spring is contained in the hole of one-way valve, adjustable lever one end is fixed in the unidirectional valve opening by collar, the adjustable lever the other end is connected with thread bush, thread bush screws in the top main aperture screw thread that is assemblied in commutation valve body (10), and locking nut is equipped with in the outer end.
CN2009202942098U 2009-12-29 2009-12-29 Unidirectional speed regulation multi-way reversing valve group Expired - Fee Related CN201705746U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009202942098U CN201705746U (en) 2009-12-29 2009-12-29 Unidirectional speed regulation multi-way reversing valve group

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Application Number Priority Date Filing Date Title
CN2009202942098U CN201705746U (en) 2009-12-29 2009-12-29 Unidirectional speed regulation multi-way reversing valve group

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105370655A (en) * 2015-12-16 2016-03-02 日照海卓液压有限公司 Multi-mode double-oil-way electric-hydraulic proportional overflow speed regulating valve
CN106640810A (en) * 2016-11-21 2017-05-10 湖南鸿辉科技有限公司 Integral type multi-way valve and working method thereof
CN107337145A (en) * 2016-05-03 2017-11-10 中国国际海运集装箱(集团)股份有限公司 Decline speed-regulating hydraulic system and the van-type lift truck with the hydraulic system
CN110552920A (en) * 2019-09-27 2019-12-10 潍柴动力股份有限公司 Valve body structure, hydraulic system and walking machinery for reducing back pressure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105370655A (en) * 2015-12-16 2016-03-02 日照海卓液压有限公司 Multi-mode double-oil-way electric-hydraulic proportional overflow speed regulating valve
CN107337145A (en) * 2016-05-03 2017-11-10 中国国际海运集装箱(集团)股份有限公司 Decline speed-regulating hydraulic system and the van-type lift truck with the hydraulic system
CN107337145B (en) * 2016-05-03 2019-09-10 中国国际海运集装箱(集团)股份有限公司 Decline speed-regulating hydraulic system and the van-type lift truck with the hydraulic system
CN106640810A (en) * 2016-11-21 2017-05-10 湖南鸿辉科技有限公司 Integral type multi-way valve and working method thereof
CN110552920A (en) * 2019-09-27 2019-12-10 潍柴动力股份有限公司 Valve body structure, hydraulic system and walking machinery for reducing back pressure
CN110552920B (en) * 2019-09-27 2021-10-08 潍柴动力股份有限公司 Valve body structure, hydraulic system and walking machinery for reducing back pressure

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C14 Grant of patent or utility model
GR01 Patent grant
LICC Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model
EE01 Entry into force of recordation of patent licensing contract

Assignee: Luzhou Zhongda Science & Technology Hydraulic Parts Co., Ltd.

Assignor: Luzhou Jiangyang Changjiang Hydraulic Pressure Technology Co., Ltd.

Contract record no.: 2012510000097

Denomination of utility model: Unidirectional speed regulation multi-way reversing valve group

Granted publication date: 20110112

License type: Exclusive License

Record date: 20121012

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110112

Termination date: 20161229