CN204083373U - A kind of multi-way valve with off-load protection - Google Patents
A kind of multi-way valve with off-load protection Download PDFInfo
- Publication number
- CN204083373U CN204083373U CN201420518166.8U CN201420518166U CN204083373U CN 204083373 U CN204083373 U CN 204083373U CN 201420518166 U CN201420518166 U CN 201420518166U CN 204083373 U CN204083373 U CN 204083373U
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Abstract
The utility model discloses a kind of multi-way valve with off-load protection; it is characterized in that: join side with this work and be connected with basic connection; this basis connection comprises basic valve body; this basic valve body is also provided with off-load solenoid valve and guide's remote-control relief valve, offers in this basic valve body and the oil-feed runner and oil return runner that join and communicate and the connection oil duct being connected described off-load solenoid valve and guide's remote-control relief valve of working.The utility model is by the installing space of the load-sensitive permanent-flow valve and pressure-limit valve that decrease original multi-way valve; while saving material; reduce processing cost; in addition; basic valve body arranges off-load solenoid valve and guide's remote-control relief valve, and what utilize off-load solenoid valve obtains electric and dead electricity, controls the working state of each work connection; meanwhile, the function of off-load protection is realized.
Description
Technical field
The utility model relates to a kind of multi-way valve, particularly a kind of multi-way valve with off-load protection.
Background technique
Multi-way valve is the core component of hoist, controls the action such as crane rotation, flexible, luffing, elevator.Existing multi-way valve as shown in Figure 1, this multi-way valve comprises four work connection, be respectively revolution connection 21 ', flexible connection 22 ', luffing connection 23 ' and elevator connection 24 ', oil inlet and oil return connection 1 ' and gland 3 ' is connected respectively in the both sides of four work connection, oil inlet and oil return connection is provided with load-sensitive constant current voltage limiting valve 12 ', oil inlet and oil return connection is reserved with the interface 11 ' connecing unloading valve, because existing load-sensitive constant current off-load valve block 12 ' is installed on oil-feed connection, increase the volume of multi-way valve oil inlet and oil return connection, cause the raising of processing cost and the cost of raw material.In addition, existing multi-way valve does not have by electrical control itself, realizes normal work and the safety protection function of multi-way valve; need additionally unloading valve to be installed outward realize at the valve body of multi-way valve, cause the installing space of multi-way valve to increase, cause trouble to stringing; meanwhile, also add system cost.
Model utility content
The technical problems to be solved in the utility model is the present situation for prior art, and provide a kind of compact structure, installing space is little, the multi-way valve of the band off-load protection of low cost of manufacture.
The utility model solves the problems of the technologies described above adopted technological scheme: a kind of multi-way valve with off-load protection, comprise compact siro spinning technology each other and the quantity work connection that can increase and decrease, it is characterized in that: also comprise and to join the basis that side is connected with this work and join, this basis connection comprises basic valve body, this basic valve body is also provided with off-load solenoid valve and guide's remote-control relief valve, offers in this basic valve body and the oil-feed runner and oil return runner that join and communicate and the connection oil duct being connected described off-load solenoid valve and guide's remote-control relief valve of working;
Described off-load solenoid valve comprises the off-load valve body be arranged on this basic valve body, be arranged on this basic valve body in and the off-load valve pocket be connected with this unloading valve end of body, the off-load spool be arranged in this off-load valve pocket, this unloading valve puts and has and the described filler opening being connected the described off-load solenoid valve that oil duct communicates, the relief hole described off-load spool having the conduction hole communicated with the filler opening of this off-load solenoid valve and communicate with described oil return runner, is provided with the thimble driven by mobile putter in the described off-load valve body relative with this relief hole;
Described guide's remote-control relief valve comprises the main valve seat be arranged on this basic valve body, be arranged on the restrictor ring in this main valve seat, to be arranged in this basic valve body and the main valve housing offseted with this restrictor ring end and the overflow spool be slidably arranged in this main valve housing, this main valve housing has the filler opening of the described guide's remote-control relief valve communicated with described oil return runner, main spring chamber is formed between described overflow spool and described restrictor ring, described overflow spool has the overflow spool damping hole communicated with this main spring chamber, described restrictor ring has the guide's damping hole communicated with this main spring chamber, described main valve seat with described restrictor ring have the first segment discharge orifice being connected described connection oil duct and described guide's damping hole, auxiliary spring chamber is formed between described restrictor ring and described main valve seat, the blocking for guide's damping hole described in shutoff is provided with in this auxiliary spring chamber, described restrictor ring with described main valve seat also have the second section discharge orifice being connected described auxiliary spring chamber and described oil return runner.
As improvement, described basic valve body is also provided with inlet pressure recuperation valve, each work connection includes a work valve body, and described work valve body is provided with outlet pressure recuperation valve and selector valve.
Improve again, described inlet pressure recuperation valve comprises the inlet pressure recuperation valve valve rod be arranged in this basic valve body, this inlet pressure recuperation valve valve rod has the first control head, on described basic valve body, the both sides of this first control head have the V chamber communicated with oil-feed runner and the H chamber communicated with oil return runner, one end of this inlet pressure recuperation valve valve rod is formed with inlet pressure spring chamber, the other end of this inlet pressure recuperation valve valve rod is formed with inlet pressure counter balance pocket, and this inlet pressure counter balance pocket communicates with described V chamber.
Improve again, described work valve body has the first working hole, second working hole and the compensation runner communicated with described inlet pressure spring chamber, described outlet pressure recuperation valve comprises and is arranged on compensating spool in described work valve body and the interior cap being provided with spring, one end face of this spring and described compensating spool offsets, this compensating spool has the drain flow path communicated with the other end of this compensating spool, when the elastic force that described compensating spool overcomes described spring moves to certain distance, described drain flow path communicates with described compensation runner, on described work valve body, centered by described compensating spool, symmetry has L chamber and R chamber, described work valve body has O chamber that is relative with the other end of described compensating spool and that be located for the other end of this compensating spool, described work valve body has the W chamber communicated with described oil-feed runner, described selector valve comprises commutation valve rod, this commutation valve rod has the second control head, the first guiding valve and the second guiding valve is respectively in the both sides of this second control head, the first groove and the second groove is had in the both sides of described first guiding valve, the 3rd groove and the 4th groove is had in the both sides of described second guiding valve.
Compared with prior art, owing to the utility model has the advantage of: the utility model is relative to existing multi-way valve, decrease the load-sensitive permanent-flow valve of original multi-way valve and the installing space of pressure-limit valve, while saving material, reduce processing cost, in addition, basic valve body arranges off-load solenoid valve and guide's remote-control relief valve, when the electromagnet dead electricity of off-load solenoid valve, relief hole do not blocked by thimble on mobile putter, the hydraulic oil of oil-feed runner is directly back to fuel tank by the filler opening of the guide's remote-control relief valve on main valve housing, each work is joined and is in the state of quitting work, when the electromagnet of off-load solenoid valve obtains electric, relief hole blocked by thimble on mobile putter, main spring chamber hydraulic oil is caused to build the pressure, now, the overflow spool damping hole of hydraulic oil on overflow spool, blocking is pushed open through guide's damping hole, hydraulic oil in main spring chamber is communicated with auxiliary spring chamber, pressure release is carried out through second section discharge orifice, make the hydraulic oil of oil-feed runner push overflow spool open to communicate with fuel tank, achieve the effect of guide's overflow, now, the hydraulic coupling of oil-feed runner is the set pressure of guide's remote-control relief valve, each work connection is in normal working.
Accompanying drawing explanation
Fig. 1 is the structural representation of original multi-way valve;
Fig. 2 is the structural representation of off-load protection part in the utility model embodiment;
Fig. 3 is A place partial enlarged drawing in Fig. 2;
Fig. 4 is B place partial enlarged drawing in Fig. 2;
Fig. 5 is the form structure schematic diagram of the utility model embodiment;
Fig. 6 is the structural representation of inlet pressure recuperation valve in the utility model embodiment;
Fig. 7 is the partial enlarged drawing at F place in Fig. 6;
Fig. 8 is the structural representation of the utility model embodiment middle outlet pressure-compensated valve and selector valve;
Fig. 9 is the structural representation that the utility model embodiment middle outlet pressure-compensated valve is in the first working position;
Figure 10 is the structural representation that the utility model embodiment middle outlet pressure-compensated valve is in the second working position;
Figure 11 is the structural representation that the utility model embodiment middle outlet pressure-compensated valve is in the 3rd working position;
Figure 12 is the hydraulic diagram that working fluid pressure in the utility model embodiment feeds back to inlet pressure spring chamber.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.
As shown in Fig. 2 to 12; the multi-way valve of the band off-load protection in this enforcement; comprise work connection and basis connection 1; wherein; work joins compact siro spinning technology and quantity each other and can increase and decrease; in the present embodiment, work connection includes revolution connection 41, flexible connection 42, luffing connection 43 and elevator connection 44, and basis connection 1 is connected to work connection side.
Wherein, basis connection 1 comprises basic valve body 11, this basic valve body 11 is also provided with off-load solenoid valve 3 and guide's remote-control relief valve 2, offers in this basic valve body 11 and the oil-feed runner P and oil return runner T that join and communicate and the connection oil duct 12 being connected off-load solenoid valve 3 and guide's remote-control relief valve 2 of working;
Off-load solenoid valve 3 comprises the off-load valve body 31 be arranged on this basic valve body 11, to be arranged in this basic valve body 11 and the off-load valve pocket 35 be connected with this off-load valve body 31 end, be arranged on the off-load spool 34 in this off-load valve pocket 35, this off-load valve pocket 35 has and the filler opening 351 being connected the off-load solenoid valve that oil duct 12 communicates, off-load spool 34 has the conduction hole 342 and the relief hole 341 logical with oil return runner T-phase that communicate with the filler opening 351 of this off-load solenoid valve, the thimble 33 driven by mobile putter 32 is provided with in the off-load valve body 31 relative with this relief hole 341,
Guide's remote-control relief valve 2 comprises the main valve seat 21 be arranged on this basic valve body 11, be arranged on the restrictor ring 24 in this main valve seat 21, to be arranged in this basic valve body 11 and the main valve housing 22 offseted with this restrictor ring 24 end and the overflow spool 23 be slidably arranged in this main valve housing 22, this main valve housing 22 has the filler opening 221 of the guide's remote-control relief valve led to oil return runner T-phase, main spring chamber 27 is formed between overflow spool 23 and restrictor ring 24, overflow spool 23 has the overflow spool damping hole 231 communicated with this main spring chamber 27, restrictor ring 24 has the guide's damping hole 241 communicated with this main spring chamber 27, main valve seat 21 with restrictor ring 24 have the first segment discharge orifice 242 connecting oil duct 12 and guide's damping hole 241, auxiliary spring chamber 26 is formed between restrictor ring 24 and main valve seat 21, the blocking 25 for shutoff guide damping hole 241 is provided with in this auxiliary spring chamber 26, restrictor ring 24 and main valve seat 21 also have the second section discharge orifice 243 of auxiliary connection spring chamber 26 and oil return runner T.
Original oil-feed connection and oil return connection are integrated on a basis connection 1 by the utility model, reduce the volume and weight of original multi-way valve, in addition, basic valve body 11 arranges off-load solenoid valve 3 and guide's remote-control relief valve 2, when the electromagnet dead electricity of off-load solenoid valve 3, relief hole 341 do not blocked by thimble 33 on mobile putter 32, now, the hydraulic oil of oil-feed runner P is after overflow spool damping hole 231, enter main spring chamber 27, through guide's damping hole 241, flow into from first segment discharge orifice 242 and connect oil duct 12, the hydraulic oil connecting oil duct 12 enters the filler opening 351 of off-load solenoid valve, through conduction hole 342, after relief hole 341, be back to oil return runner T and carry out off-load, therefore, in this state, the hydraulic oil of oil-feed runner P only need overcome the elastic force of main spring chamber 27 inner spring, overflow spool 23 can be promoted, the hydraulic oil of oil-feed runner P is made directly to be back to fuel tank by the filler opening 221 of the guide's remote-control relief valve on main valve housing 22, now, each work connection is in the state of quitting work, when the electromagnet of off-load solenoid valve 3 obtains electric, relief hole 341 blocked by thimble 33 on mobile putter 32, now, the hydraulic oil of oil-feed runner P does not carry out off-load by conduction hole 342 and relief hole 341, main spring chamber 27 hydraulic oil is caused to build the pressure, make the hydraulic oil of oil-feed runner P directly can not push overflow spool 23 open and get back to fuel tank, now, the overflow spool damping hole 231 of hydraulic oil on overflow spool 23, blocking 25 is pushed open through guide's damping hole 241, hydraulic oil in main spring chamber 27 is communicated with auxiliary spring chamber 26, pressure release is carried out through second section discharge orifice 243, make the hydraulic oil of oil-feed runner P push overflow spool 23 open to communicate with fuel tank, achieve the effect of guide's overflow.Now, the hydraulic coupling of oil-feed runner P is the set pressure of guide's remote-control relief valve 2, and each work connection is in normal working.
In addition, the utility model improves existing pressure compensation structure, is specially:
Basic valve body 11 is also provided with inlet pressure recuperation valve 5, and each work connection includes a work valve body 4, and work valve body 4 is provided with outlet pressure recuperation valve 6 and selector valve 7.
Inlet pressure recuperation valve 5 comprises the inlet pressure recuperation valve valve rod 51 be arranged in this basic valve body 11, this inlet pressure recuperation valve valve rod 51 has the first control head 511, on basic valve body 11, the both sides of this first control head 511 have the V chamber and the H chamber logical with oil return runner T-phase that communicate with oil-feed runner P, one end of this inlet pressure recuperation valve valve rod 51 is formed with inlet pressure spring chamber 53, the other end of this inlet pressure recuperation valve valve rod 51 is formed with inlet pressure counter balance pocket 52, and this inlet pressure counter balance pocket 52 communicates with V chamber.
Work valve body 4 has the first working hole Ai, second working hole Bi and the compensation runner 13 communicated with inlet pressure spring chamber 53, outlet pressure recuperation valve 6 comprises and is arranged on compensating spool 62 in work valve body 4 and the interior cap 61 being provided with spring, one end face of this spring and compensating spool 62 offsets, this compensating spool 62 has the drain flow path 621 communicated with the other end of this compensating spool 62, when the elastic force that compensating spool 62 overcomes spring moves to certain distance, drain flow path 621 communicates with compensation runner 13, on work valve body 4, centered by compensating spool 62, symmetry has L chamber and R chamber, work valve body 4 has O chamber that is relative with the other end of compensating spool 62 and that be located for the other end of this compensating spool 62, work valve body 4 has the W chamber communicated with oil-feed runner P, selector valve 7 comprises commutation valve rod 71, this commutation valve rod 71 has the second control head 72, the first guiding valve 73 and the second guiding valve 74 is respectively in the both sides of this second control head 72, the first groove 75 and the second groove 76 is had in the both sides of the first guiding valve 73, the 3rd groove 77 and the 4th groove 78 is had in the both sides of the second guiding valve 74.
Pressure compensated working principle of the present utility model is:
Off-load solenoid valve 3 obtains electric, each work connection is in normal working, and the selector valve 7 in each work connection is in meta state, and the hydraulic oil of oil-feed runner P enters V chamber, flow into inlet pressure counter balance pocket 52, make the thrust that inlet pressure recuperation valve valve rod 51 is subject to left, when this thrust overcomes the spring force in inlet pressure spring chamber 53, inlet pressure recuperation valve valve rod 51 is to left movement, V chamber and H chamber are connected, now, the hydraulic oil of oil-feed runner P is directly back to fuel tank, as shown in Figure 6,7.
When the selector valve valve rod 71 in the connection that works moves right, namely the right position of selector valve 7 is enable, now, L chamber is connected with the first working hole Ai by the first groove 75, second guiding valve 74 carries out shutoff by between R chamber and the second working hole Bi, simultaneously, W chamber is connected with O chamber, make hydraulic oil from W chamber through the second groove 76, enter O chamber, a top power is upwards produced to compensating spool 62, now, along with the increase of W chamber hydraulic coupling, compensating spool 62 is by experience three working staties, first working state, hydraulic coupling is not enough to promote the spring in nut 61, O chamber and L chamber are closed, drain flow path 621 cuts off with compensation runner 13, as shown in Figure 9, second working state, along with the increase of hydraulic coupling, compensating spool 62 moves up, O chamber and L chamber through, hydraulic oil flows into the first working hole Ai from W chamber, drain flow path 621 with compensate runner 13 and still cut off, work connection is in normal working, as shown in Figure 10, 3rd working state, when there is partial high pressure in hydraulic coupling, compensating spool 62 moves up continuing, drain flow path 621 communicates with compensation runner 13, as shown in figure 11, communicate with inlet pressure spring chamber 53 owing to compensating runner 13 again, now, working fluid pressure feeds back to inlet pressure spring chamber 53 and compares with the hydraulic coupling of inlet pressure counter balance pocket 52, as shown in figure 12, thus control moving left and right of inlet pressure recuperation valve valve body 51, realize pressure compensation, ensure that the smooth working that each work joins, when the selector valve valve rod 71 in the connection that works is moved to the left, the second working hole Bi is fuel-displaced, and its principle is identical.
Pressure compensation structure of the present utility model and existing load-sensitive constant current unloading valve 12 ' compare.
Existing load-sensitive constant current unloading valve 12 ' comprises load-sensitive permanent-flow valve and load-sensitive pressure-limit valve, wherein, the effect of load-sensitive permanent-flow valve is, under meta state, can fluid in the responsive oil circuit of Shunt Load, can avoid under meta state, because of in load-sensitive oil circuit because more fluid produces pressure, this pressure can act on inlet pressure compensating spool forces compensating spool to turn right top, and system meta pressure improves in the course of time, forms high pressure; The pulsating pressure produced due to extraneous load in working procedure can be eliminated by load-sensitive pressure-limit valve, makes system stable action in the course of the work.Because existing load-sensitive constant current off-load valve block 12 ' is installed on oil inlet and oil return connection, increases the volume of multi-way valve oil inlet and oil return connection, cause the raising of processing cost and the cost of raw material.
In the utility model, decrease load-sensitive pressure-limit valve and permanent-flow valve structure.The function of load-sensitive pressure-limit valve is realized by the inlet pressure spring coupling of inlet pressure recuperation valve 5, by inlet pressure recuperation valve valve rod 51 and commutation valve rod 71 respectively and basic valve body 11 and the matching gap that works between valve body 4, adjust the function realizing load-sensitive permanent-flow valve, pressure unnecessary in the responsive oil circuit of dump load.
Therefore, the utility model, relative to existing multi-way valve, decreases the load-sensitive permanent-flow valve of original multi-way valve and the installing space of pressure-limit valve, while saving material, reduces processing cost.
Claims (4)
1. the multi-way valve with off-load protection, comprise compact siro spinning technology each other and the quantity work connection that can increase and decrease, it is characterized in that: also comprise and to join the basis that side is connected with this work and join, this basis connection comprises basic valve body, this basic valve body is also provided with off-load solenoid valve and guide's remote-control relief valve, offers in this basic valve body and the oil-feed runner and oil return runner that join and communicate and the connection oil duct being connected described off-load solenoid valve and guide's remote-control relief valve of working;
Described off-load solenoid valve comprises the off-load valve body be arranged on this basic valve body, be arranged on this basic valve body in and the off-load valve pocket be connected with this unloading valve end of body, the off-load spool be arranged in this off-load valve pocket, this unloading valve puts and has and the described filler opening being connected the described off-load solenoid valve that oil duct communicates, the relief hole described off-load spool having the conduction hole communicated with the filler opening of this off-load solenoid valve and communicate with described oil return runner, is provided with the thimble driven by mobile putter in the described off-load valve body relative with this relief hole;
Described guide's remote-control relief valve comprises the main valve seat be arranged on this basic valve body, be arranged on the restrictor ring in this main valve seat, to be arranged in this basic valve body and the main valve housing offseted with this restrictor ring end and the overflow spool be slidably arranged in this main valve housing, this main valve housing has the filler opening of the described guide's remote-control relief valve communicated with described oil return runner, main spring chamber is formed between described overflow spool and described restrictor ring, described overflow spool has the overflow spool damping hole communicated with this main spring chamber, described restrictor ring has the guide's damping hole communicated with this main spring chamber, described main valve seat with described restrictor ring have the first segment discharge orifice being connected described connection oil duct and described guide's damping hole, auxiliary spring chamber is formed between described restrictor ring and described main valve seat, the blocking for guide's damping hole described in shutoff is provided with in this auxiliary spring chamber, described restrictor ring with described main valve seat also have the second section discharge orifice being connected described auxiliary spring chamber and described oil return runner.
2. multi-way valve according to claim 1, is characterized in that: on described basic valve body, be also provided with inlet pressure recuperation valve, and each work connection includes a work valve body, and described work valve body is provided with outlet pressure recuperation valve and selector valve.
3. multi-way valve according to claim 2, it is characterized in that: described inlet pressure recuperation valve comprises the inlet pressure recuperation valve valve rod be arranged in this basic valve body, this inlet pressure recuperation valve valve rod has the first control head, on described basic valve body, the both sides of this first control head have the V chamber communicated with oil-feed runner and the H chamber communicated with oil return runner, one end of this inlet pressure recuperation valve valve rod is formed with inlet pressure spring chamber, the other end of this inlet pressure recuperation valve valve rod is formed with inlet pressure counter balance pocket, and this inlet pressure counter balance pocket communicates with described V chamber.
4. multi-way valve according to claim 3, it is characterized in that: on described work valve body, there is the first working hole, second working hole and the compensation runner communicated with described inlet pressure spring chamber, described outlet pressure recuperation valve comprises and is arranged on compensating spool in described work valve body and the interior cap being provided with spring, one end face of this spring and described compensating spool offsets, this compensating spool has the drain flow path communicated with the other end of this compensating spool, when the elastic force that described compensating spool overcomes described spring moves to certain distance, described drain flow path communicates with described compensation runner, on described work valve body, centered by described compensating spool, symmetry has L chamber and R chamber, described work valve body has O chamber that is relative with the other end of described compensating spool and that be located for the other end of this compensating spool, described work valve body has the W chamber communicated with described oil-feed runner, described selector valve comprises commutation valve rod, this commutation valve rod has the second control head, the first guiding valve and the second guiding valve is respectively in the both sides of this second control head, the first groove and the second groove is had in the both sides of described first guiding valve, the 3rd groove and the 4th groove is had in the both sides of described second guiding valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420518166.8U CN204083373U (en) | 2014-09-11 | 2014-09-11 | A kind of multi-way valve with off-load protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420518166.8U CN204083373U (en) | 2014-09-11 | 2014-09-11 | A kind of multi-way valve with off-load protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204083373U true CN204083373U (en) | 2015-01-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420518166.8U Withdrawn - After Issue CN204083373U (en) | 2014-09-11 | 2014-09-11 | A kind of multi-way valve with off-load protection |
Country Status (1)
| Country | Link |
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| CN (1) | CN204083373U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197046A (en) * | 2014-09-11 | 2014-12-10 | 宁波市博尔法液压有限公司 | Multi-way valve with unloading protection function |
| CN105822618A (en) * | 2016-05-22 | 2016-08-03 | 浙江海宏液压科技股份有限公司 | Lifting valve plate of electric-hydraulic proportional multi-way valve of forklift |
| CN108006268A (en) * | 2017-11-10 | 2018-05-08 | 宁波索诺工业自控设备有限公司 | A kind of multi-functional switching solenoid valve |
-
2014
- 2014-09-11 CN CN201420518166.8U patent/CN204083373U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197046A (en) * | 2014-09-11 | 2014-12-10 | 宁波市博尔法液压有限公司 | Multi-way valve with unloading protection function |
| CN104197046B (en) * | 2014-09-11 | 2016-10-05 | 宁波市博尔法液压有限公司 | A kind of banked direction control valves of band off-load protection |
| CN105822618A (en) * | 2016-05-22 | 2016-08-03 | 浙江海宏液压科技股份有限公司 | Lifting valve plate of electric-hydraulic proportional multi-way valve of forklift |
| CN105822618B (en) * | 2016-05-22 | 2019-01-11 | 浙江海宏液压科技股份有限公司 | A kind of descending valve plate of fork truck electro-hydraulic proportional multi-way valve |
| CN108006268A (en) * | 2017-11-10 | 2018-05-08 | 宁波索诺工业自控设备有限公司 | A kind of multi-functional switching solenoid valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150107 Effective date of abandoning: 20161005 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |