CN200989338Y - Integrated hand multipath reversing valve - Google Patents
Integrated hand multipath reversing valve Download PDFInfo
- Publication number
- CN200989338Y CN200989338Y CN 200620141069 CN200620141069U CN200989338Y CN 200989338 Y CN200989338 Y CN 200989338Y CN 200620141069 CN200620141069 CN 200620141069 CN 200620141069 U CN200620141069 U CN 200620141069U CN 200989338 Y CN200989338 Y CN 200989338Y
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- oil
- valve
- rotating bucket
- chamber
- grooves
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Abstract
The utility model relates to an integral hand-operated multi-channel conversion valve consisting of an integral valve body, a pivoted-bucket valve stem, a moveable arm valve stem, an oil inlet check valve and a master safety valve. The valve body is a single-bed structure, wherein the pivoted-bucket coupling hole is provided with, from the left to the right and in sequence, a left low-pressure oil-return chamber, a lower pivoted-opening oil-outlet chamber, a left high-pressure oil chamber connected with the pivoted bucket, three central vertical load-released grooves, a right high-pressure oil chamber connected with the pivoted bucket, a upper pivoting-opening oil-outlet chamber and a right low-pressure oil-return chamber. The moveable arm coupling hole is provided with, from the left to the right and in sequence, a left low-pressure oil-return chamber, a lowering-opening oil-outlet chamber, three central vertical load-released grooves, a lifting high-pressure oil chamber connected with the moveable arm, a lifting-opening oil-outlet chamber and a right low-pressure oil chamber. The moveable arm coupling hole is provided with, from the left to the right and in sequence, a left low-pressure oil-return chamber, a lowering-opening oil chamber, three central vertical load-released grooves, a moveable arm lifting high-pressure oil chamber, a lifting-opening oil-outlet chamber and a right low-pressure oil-return chamber. The utility model is simple in the structure, provides three central vertical load-released grooves at the pivoted-bucket coupling hole and the moveable arm coupling hole, has a small pressure loss in the occasions of the big pump capacity and high pressure, has a good micro control valve flow performance, omits the prior hydraulic lock device, reduces the production cost, increases the pressure class and has a little external leakage, a big through-flow capacity and a convenient operation.
Description
Technical field
The utility model relates to hydraulic machinery, especially to being applicable to the improvement of DF integral manual multi-path reversing valve in the loader hydraulic system of working.
Background technique
The most adapted DF of the hydraulic system of working of present homemade wheel loader integral manual multi-path reversing valve, this multi-way reversing valve arrangement has been finalized the design for many years, simple in structure, easy to maintenance and failure judgement is directly perceived, accessory is abundant, low with respect to guide's hydraulic system of working to system's turbidity test receptance, enough competitive ability are arranged, so this integral manual multi-path reversing valve is still the supporting main product in market in significant period of time from now on price.Chinese patent mandate publication number is the patent of invention of CN1560480A, a kind of loader DF integral manual multi-path reversing valve is disclosed, it is external that this invention joins in line check valve with rotating bucket, and the swing arm connection promotes mouth the hydraulic lock device is set, and the neutral position compensating groove adopts two groove structures.This structure can solve the problem that the intrinsic internal leakage of former integral manual multi-path reversing valve is big, reversing maneuver power is big, but still has following drawback:
1, valve body is double layer construction (comprising rotating bucket connection, swing arm connection), foundry goods scrappage height, and the structure relative complex, the manufacture cost of multi-way valve strengthens, and is unfavorable for the popularization of product;
2, the neutral position compensating groove adopts two groove structures, and under big flow and high pressure use occasion, pressure loss value is bigger than normal, and the influence that the power of surging is controlled valve rod is not easy to eliminate;
3, the swing arm connection promotes mouth hydraulic lock is set, motor is when flameout state, valve rod has only could be fallen big arm after directly being pushed into floating bit from the neutral position, but this moment, the speed governing zone of valve rod was crossed over, the fine setting performance of valve rod is lost (oil return in the big chamber of boom cylinder this moment is in high-pressure high-flow), occurs security incident easily;
4, the hydraulic lock device is three grades of concentric structures, and it is high that difficulty of processing is wanted relatively, occurs clamping stagnation and not oil sealing state easily, and the meta settling amount strengthens on the contrary, liquid circulates the big resistance of out-of-date generation; Mechanical release device complexity is prone to mechanical failure, and reliability reduces.
Summary of the invention
The purpose of this utility model provides a kind of integral manual multi-path reversing valve, is applicable to the loader hydraulic system of working, is characterized in the pressure rating height, manipulation is light, internal leakage is little, through-current capability is big, and fretting performance is preferably arranged.
A kind of integral manual multi-path reversing valve of the utility model, comprise the integrated type valve body, rotary valve pole, moving arm valve pole, in line check valve, main safety valve, it is characterized in that valve body is a single layer structure, rotating bucket shaft coupling hole in the valve body has nine vertical oil grooves or oil pocket at least, be provided with left low pressure oil back chamber from left to right successively, following transit goes out oil pocket, rotating bucket joins left high-voltage oil cavity, three compensating grooves in neutral position, rotating bucket joins right high-voltage oil cavity, last transit goes out oil pocket, right low pressure oil back chamber, wherein the 3rd oil groove rotating bucket joins left high-voltage oil cavity and communicates with the oil pocket that goes out of the rotating bucket connection in line check valve of its top, and join right high-voltage oil cavity cross-over connection by ring shaped oil passage and the 7th oil groove rotating bucket, article one, oil groove left side low pressure oil back chamber communicates with the rotating bucket connection loculus overload Fill valve spill port at its top, and communicates with rotating bucket the United Nations General Assembly chamber overload Fill valve spill port at its top; The rotating bucket connection loculus overload Fill valve oil inlet hole that transit goes out oil pocket and its top under the second oil groove communicates, and with the rotating bucket at back connection down transit communicate, article eight, rotating bucket the United Nations General Assembly chamber overload Fill valve oil inlet hole that transit goes out oil pocket and its top on the oil groove communicates, and go up transit with the rotating bucket at back connection and communicate, the 9th oil groove low pressure oil back chamber and rotating bucket the United Nations General Assembly chamber at its top are transshipped the Fill valve spill port and are communicated; Swing arm shaft coupling hole has eight oil grooves or oil pocket at least, being provided with left low pressure oil back chamber, port for drawdown from left to right according to this goes out oil pocket, three compensating grooves in neutral position, swing arm connection and promotes high-voltage oil cavity, promotes mouth and go out oil pocket, right low pressure oil back chamber, wherein swing arm connection promote the swing arm of high-voltage oil cavity by the back promote in mouthful in line check valve hole horizontal oil duct with join through rotating bucket after the neutral position compensating groove communicate, second oil groove port for drawdown goes out oil pocket and communicates with the port for drawdown at top, and the 7th oil groove lifting mouth goes out oil pocket and communicate with the lifting mouth at top.
The through hole that is positioned at top, rotating bucket shaft coupling hole is provided with rotating bucket connection in line check valve hole, safe valve opening from left to right successively, and split in valve body oil suction chamber both sides, wherein rotating bucket connection in line check valve hole attachment face has a distance apart from integrated type valve body left surface, promptly toward the indentation of oil suction chamber direction.
The rotary valve pole that is loaded on rotating bucket shaft coupling hole is a solid construction, rotary valve pole is opened shelves 4 places, second and third four throttling grooves of having opened shelves from left to right, rotary valve pole from left to right the three cylindrical seal section bore 4 place's radial holes, each throttling groove becomes miter angle to stagger with radial hole, rotary valve pole second shaft shoulder place has from left to right been driven four disc throttling grooves, and the 9th shaft shoulder place has driven two disc throttling grooves from left to right.
The moving arm valve pole that is loaded on swing arm shaft coupling hole is a solid construction, moving arm valve pole is opened shelves 4 places, two, three open shelves places and driven four throttling grooves from left to right, moving arm valve pole three cylindrical seal section from left to right bores 4 place's radial holes, each throttling groove becomes miter angle to stagger with radial hole, moving arm valve pole 4 places second shaft shoulder place have from left to right driven four disc throttling grooves, and the 9th shaft shoulder place has driven four disc throttling grooves from left to right.
The in line check valve surface of contact that is assemblied in the integrated type valve body is spherical, is the circumference seal form.
The utility model is made as single layer structure with valve body, and structure is simple relatively; At three compensating grooves in rotating bucket shaft coupling hole and each neutral position, swing arm shaft coupling hole, under big flow and high pressure use occasion, the pressure loss is little; Each throttling groove makes that the effective speed governing of multiple directional control valve zone is wide, and it is good to control the fine motion characteristic, has omitted original hydraulic lock device, the negative effect of having avoided the hydraulic lock lock to bring, and can reduce production costs; Reflux in the big chamber of boom cylinder when being in the high-pressure high-flow swing arm and descending fast, it is less that the power of surging is controlled influence to valve rod, and pressure rating can be done higherly, and internal leakage is little, through-current capability is big, handles light.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is embodiment's principal section structural representation.
Fig. 2 is the right elevation of Fig. 1.
Fig. 3 is the main sectional view of embodiment's valve body.
Fig. 4 is the A-A sectional view of Fig. 3.
Fig. 5 is the B-B sectional view of Fig. 3.
Fig. 6 is the rotary valve pole structural representation.
Fig. 7 is the moving arm valve pole structural representation.
Fig. 8 is the D-D sectional view of Fig. 6, Fig. 7.
Fig. 9 is a hydraulic system principle figure of the present utility model.
Embodiment
With reference to Fig. 1-Fig. 5, integral manual multi-path reversing valve, the integrated type valve body 2, rotary valve pole 1, moving arm valve pole 13, in line check valve 7, the main safety valve 12 that comprise single layer structure, rotating bucket shaft coupling hole 18 in the integrated type valve body 2 is provided with left low pressure oil back chamber 3.1a from left to right successively, and following transit goes out oil pocket 4, and rotating bucket joins left high-voltage oil cavity 5, three compensating grooves in neutral position 9.1,9.2,9.3, rotating bucket joins right high-voltage oil cavity 10, and last transit goes out oil pocket 11, right low pressure oil back chamber 3.2a.Wherein the 3rd oil groove rotating bucket joins left high-voltage oil cavity 5 and goes out oil pocket 6 with the rotating bucket connection in line check valve 7 of its top and communicate, join right high-voltage oil cavity 10 cross-over connections by ring shaped oil passage 25 and the 7th oil groove rotating bucket simultaneously, article one, oil groove low pressure oil back chamber 3.1 communicates with the rotating bucket connection loculus overload Fill valve spill port 23 at its top, the rotating bucket connection loculus overload Fill valve oil inlet hole 24 that transit goes out oil pocket 4 and its top under the second oil groove communicates, joining down with the rotating bucket at back simultaneously, transit 28 communicates, article eight, rotating bucket the United Nations General Assembly chamber overload Fill valve oil inlet hole 26 that transit goes out oil pocket 11 and its top on the oil groove communicates, go up transit 29 with the rotating bucket connection at back simultaneously and communicate, the 9th oil groove low pressure oil back chamber 3.2 communicates with rotating bucket the United Nations General Assembly chamber overload Fill valve spill port 27 at its top.Double-action overload Fill valve 33 is integrated in valve piece 34 and is fastened on the flanged surface at rotating bucket linked hole 18 tops with construction bolt 35, as shown in Figure 2.Overload Fill valve 33 is a double-purpose valve, and its effect is when eliminating scraper bowl and being subjected to external impulsive load or other mechanisms and interfering, pocketed oil that produces in oil cylinder or negative pressure appearance.
Swing arm shaft coupling hole 22 has eight oil grooves, promptly be provided with left low pressure oil back chamber 3.1b from left to right successively, port for drawdown goes out oil pocket 14, neutral position three compensating grooves 15.1,15.2,15.3, the swing arm connection promotes high-voltage oil cavity 16, promotes mouth and goes out oil pocket 17, right low pressure oil back chamber 3.2b, wherein port for drawdown go out oil pocket 14 and back the swing arm connection down transit 30 communicate, promote swing arm connection that mouth goes out oil pocket 17 and back upward transit 31 communicate; Article six, oil groove swing arm connection promote the swing arm of high-voltage oil cavity 16 by the back promote in mouthful in line check valve hole horizontal oil duct 32 with join through rotating bucket after the neutral position compensating groove communicate.The left low pressure oil back chamber 3.1a in above-mentioned left low pressure oil back chamber 3.1b, right low pressure oil back chamber 3.2b and rotating bucket shaft coupling hole 18, right low pressure oil back chamber 3.2a constitute shared pathway.
The through hole that is provided with above rotating bucket shaft coupling hole 18 is provided with rotating bucket connection in line check valve hole 19, safe valve opening 21 from left to right successively, and split both sides at valve body oil suction chamber 20, wherein rotating bucket connection in line check valve hole 19 attachment faces have a distance apart from integrated type valve body 2 left surfaces, promptly toward oil suction chamber 20 direction indentations.Main safety valve 12 screws in safety valve opening 21 with the form of threaded insert, and its effect is a control system pressure, and when system pressure surpassed rated pressure, main safety valve 12 was opened, and pressure oil flows back to fuel tank, and the protection hydraulic system is not subjected to excess pressure and damages.
The unidirectional valve seat of in line check valve 7 screws in rotating bucket connection in line check valve hole 19 and swing arm connection in line check valve hole with the form of threaded insert, the effect of in line check valve 7 is pressure oil refluence fuel tanks when preventing to commutate, thereby can overcome " nodding " phenomenon in the loader working procedure.In line check valve 7 surface of contact are spherical, are the circumference contact form, good airproof performance and easily processing.Since in line check valve is external, in valve body, make valve rod can adopt solid construction.
With reference to Fig. 6, Fig. 7, Fig. 8, the rotary valve pole 1 that is assemblied in the integrated type valve body 2 is solid construction, rotary valve pole 1 is opened shelves 4 places, rotary valve pole 1 two, three is opened shelves places and has been driven four circular arc throttling grooves 1.2 from left to right, rotary valve pole 1 three cylindrical seal section from left to right bores 4 radial holes 1.1, and 1.1 one-tenth miter angles of each throttling groove 1.2 and radial hole stagger.
The moving arm valve pole 13 that is assemblied in the integrated type valve body 2 is solid construction, moving arm valve pole 13 is opened shelves 4 places, moving arm valve pole 13 two, three is opened shelves places and has been driven four circular arc throttling grooves 13.2 from left to right, moving arm valve pole 13 three cylindrical seal section from left to right bores 4 radial holes 13.1, and 13.1 one-tenth miter angles of each throttling groove 13.2 and radial hole stagger.
Because rotary valve pole 1 and moving arm valve pole 13 are solid construction, good rigidity, resiliently deformable is little, thermal capacity is improved, and it is little to make it thermal distortion, accuracy of form and position height, can reduce the matching gap of valve rod and valve body hole, stem diameter dwindles simultaneously, can reduce the internal leakage of multiple directional control valve significantly; Appropriate design balancing slit and then valve rod hydraulic lock can not occur when high-pressure high-flow; Each throttling groove of appropriate design makes that the effective speed governing of multiple directional control valve zone is wide.
Working principle:
With reference to Fig. 9, the utility model oil circuit adopts the series parallel connection form, and its effect is by the flow direction control rotary ink tank that changes fluid and the moving direction of boom cylinder, makes each object rest on a certain position, to satisfy the requirement of the various Working motions of engineering machinery.Rotating bucket connection selector valve is three six-way valves, spring reset, and it can be controlled on the scraper bowl changes, commentaries on classics and three actions of meta down.Shown position is " meta ", and pulling out is " go up and change ", advances to be " changeing down ".Swing arm connection selector valve is four six-way valves, the steel ball location, and it can control swing arm lifting, meta, decline and four actions of floating.Shown position is " meta ", and it is " lifting " that valve rod is pulled out, and advancing one is " decline ", and advancing two is " floating ".
The P mouth is a filler opening in the multi-way valve, and the T mouth is a return opening, and A1, B1 mouth communicate with the big chamber of rotary ink tank, loculus respectively, and A2, B2 communicate with the big chamber of boom cylinder, loculus respectively.
The meta position: rotary valve pole, when moving arm valve pole mediates, from the oil of work oil pump, by oil inlet P through the logical oil return inlet T oil sump tank of oil duct.
Swing arm promotes: moving arm valve pole is pulled out, P is closed to the T mouth, hydraulic oil enters into the A2 mouth by the P mouth and enters the big chamber of boom cylinder again, and swing arm is promoted, and the hydraulic oil of boom cylinder loculus is through the logical T mouth oil sump tank of B2 mouth.
Swing arm descends: moving arm valve pole is advanced to the position that descends, P is closed to the T mouth, hydraulic oil enters into the B2 mouth by the P mouth and enters into the boom cylinder loculus again, and swing arm is descended, and the hydraulic oil in the big chamber of boom cylinder is through the logical T mouth oil sump tank of A2 mouth.
Swing arm floats: moving arm valve pole is advanced to floating bit, and at this moment A2, B2, P mouth all communicate with the T mouth, and the upper and lower chamber of boom cylinder communicates, and is in low-pressure state, and oil cylinder is subjected to the weight of equipment and ground effects equilibrium of forces to be in the free floating state.
Change on the scraper bowl: rotary valve pole is pulled out, P is closed to the T mouth, hydraulic oil enters into the A1 mouth by the P mouth and enters the big chamber of rotary ink tank again, and making on the scraper bowl changes, and the hydraulic oil of rotary ink tank loculus is through the logical T mouth oil sump tank of B1 mouth.
Scraper bowl changes down: rotary valve pole is advanced, P is closed to the T mouth, hydraulic oil enters into the B1 mouth by the P mouth and enters the rotary ink tank loculus again, and making under the scraper bowl changes, and the hydraulic oil in the big chamber of rotary ink tank is through the logical T mouth oil sump tank of A1.
Claims (5)
1, a kind of integral manual multi-path reversing valve, comprise integrated type valve body (2), rotary valve pole (1), moving arm valve pole (13), in line check valve (7), main safety valve (12), it is characterized in that valve body (2) is a single layer structure, rotating bucket shaft coupling hole (18) in the valve body (2) has nine vertical oil grooves or oil pocket at least, be provided with left low pressure oil back chamber (3.1a) from left to right successively, following transit goes out oil pocket (4), rotating bucket joins left high-voltage oil cavity (5), three compensating grooves (9.1 in neutral position, 9.2,9.3), rotating bucket joins right high-voltage oil cavity (10), last transit goes out oil pocket (11), right low pressure oil back chamber (3.2a), wherein the 3rd oil groove rotating bucket joins left high-voltage oil cavity (5) and goes out oil pocket (6) with the rotating bucket connection in line check valve (7) of its top and communicate, and join right high-voltage oil cavity (10) cross-over connection by ring shaped oil passage (25) and the 7th oil groove rotating bucket, article one, oil groove left side low pressure oil back chamber (3.1a) communicates with the rotating bucket connection loculus overload Fill valve spill port (23) at its top, and communicates with rotating bucket the United Nations General Assembly chamber overload Fill valve spill port (27) at its top; The rotating bucket connection loculus overload Fill valve oil inlet hole (24) that transit goes out oil pocket (4) and its top under the second oil groove communicates, and with the rotating bucket at back connection down transit (28) communicate, article eight, rotating bucket the United Nations General Assembly chamber overload Fill valve oil inlet hole (26) that transit goes out oil pocket (11) and its top on the oil groove communicates, and go up transit (29) with the rotating bucket at back connection and communicate, the 9th the right low pressure oil back chamber of oil groove (3.2a) and rotating bucket the United Nations General Assembly chamber at its top are transshipped Fill valve spill port (27) and are communicated; Swing arm shaft coupling hole (22) has eight oil grooves or oil pocket at least, be provided with left low pressure oil back chamber (3.1b) from left to right according to this, port for drawdown goes out oil pocket (14), three compensating grooves (15.1 in neutral position, 15.2,15.3), the swing arm connection promotes high-voltage oil cavity (16), promote mouth and go out oil pocket (17), right low pressure oil back chamber (3.2b), wherein swing arm connection promote the swing arm of high-voltage oil cavity (16) by the back promote in mouthful in line check valve hole horizontal oil duct (32) with join through rotating bucket after the neutral position compensating groove communicate, second oil groove port for drawdown goes out oil pocket (14) and communicates with the port for drawdown (30) at top, and the 7th oil groove lifting mouth goes out oil pocket (17) and communicate with the lifting mouth (31) at top.
2, integral manual multi-path reversing valve according to claim 1, the through hole that it is characterized in that being positioned at top, rotating bucket shaft coupling hole (18) is provided with rotating bucket connection in line check valve hole (19), safe valve opening (21) from left to right successively and splits in valve body oil suction chamber (20) both sides, wherein rotating bucket connection in line check valve hole (19) attachment face has a distance apart from integrated type valve body (2) left surface, promptly toward oil suction chamber (20) direction indentation.
3, integral manual multi-path reversing valve according to claim 1, the rotary valve pole (1) that it is characterized in that being loaded on rotating bucket shaft coupling hole (18) is a solid construction, rotary valve pole (1) is opened shelves 4 places, second and third four throttling grooves of having opened shelves from left to right, rotary valve pole (1) three cylindrical seal section from left to right bores 4 place's radial holes, each throttling groove becomes miter angle to stagger with radial hole, rotary valve pole (1) second shaft shoulder place has from left to right been driven four disc throttling grooves, and the 9th shaft shoulder place has driven two disc throttling grooves from left to right.
4, integral manual multi-path reversing valve according to claim 1, the moving arm valve pole (13) that it is characterized in that being loaded on swing arm shaft coupling hole (22) is a solid construction, moving arm valve pole (13) is opened shelves 4 places, two, three open shelves places and driven four throttling grooves from left to right, moving arm valve pole (13) three cylindrical seal section from left to right bores 4 place's radial holes, each throttling groove becomes miter angle to stagger with radial hole, moving arm valve pole 4 places second shaft shoulder place have from left to right driven four disc throttling grooves, and the 9th shaft shoulder place has driven four disc throttling grooves from left to right.
5, integral manual multi-path reversing valve according to claim 1, in line check valve (7) surface of contact that it is characterized in that being assemblied in the integrated type valve body (2) is spherical, is the circumference seal form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620141069 CN200989338Y (en) | 2006-12-12 | 2006-12-12 | Integrated hand multipath reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620141069 CN200989338Y (en) | 2006-12-12 | 2006-12-12 | Integrated hand multipath reversing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200989338Y true CN200989338Y (en) | 2007-12-12 |
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ID=38940375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620141069 Expired - Lifetime CN200989338Y (en) | 2006-12-12 | 2006-12-12 | Integrated hand multipath reversing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200989338Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775404A (en) * | 2012-10-23 | 2014-05-07 | 上海亦村仪器仪表有限公司 | Hand-operated reversing valve comprising hydraulic locking device |
| CN105840576A (en) * | 2016-05-18 | 2016-08-10 | 山东常林机械集团股份有限公司 | Electrically controlled reversing valve |
| CN107620812A (en) * | 2017-10-30 | 2018-01-23 | 圣邦集团有限公司 | A kind of banked direction control valves with valve rod interlocking positioning function |
-
2006
- 2006-12-12 CN CN 200620141069 patent/CN200989338Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775404A (en) * | 2012-10-23 | 2014-05-07 | 上海亦村仪器仪表有限公司 | Hand-operated reversing valve comprising hydraulic locking device |
| CN105840576A (en) * | 2016-05-18 | 2016-08-10 | 山东常林机械集团股份有限公司 | Electrically controlled reversing valve |
| CN107620812A (en) * | 2017-10-30 | 2018-01-23 | 圣邦集团有限公司 | A kind of banked direction control valves with valve rod interlocking positioning function |
| CN107620812B (en) * | 2017-10-30 | 2024-04-19 | 圣邦集团有限公司 | Multi-way valve with valve rod interlocking positioning function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Zhejiang Gaoyu Hydraulic Mechanical and Electrical Co., Ltd. Assignor: Chi Jianwei Contract record no.: 2010330001406 Denomination of utility model: Integrated manual multiple directional control valve for lader Granted publication date: 20071212 License type: Exclusive License Record date: 20100721 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20071212 |
|
| EXPY | Termination of patent right or utility model |