CN104196803B - A kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter - Google Patents
A kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter Download PDFInfo
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- CN104196803B CN104196803B CN201410459758.1A CN201410459758A CN104196803B CN 104196803 B CN104196803 B CN 104196803B CN 201410459758 A CN201410459758 A CN 201410459758A CN 104196803 B CN104196803 B CN 104196803B
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Abstract
The invention belongs to agriculture equipment technical field, relate to a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter.The object of the present invention is to provide a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter being applicable to farm work environment, its reliable operation, convenient operation and control.Invention increases the adaptability of electro-hydraulic hitch hydraulic system, have the design cycle short, convenient for installation and maintenance, leak less, vibrate little, reliable operation, be beneficial to the integrated and standardized advantage realizing typical hydraulic system; Add the on-the-spot flexibility of adding and changing loop, traditional hydraulic manifold block can be replaced, for heavy tractor electricity liquid lifter performance test provides great convenience; Processing technology is simple, replaces the casting technique of existing complex and expensive, and dismounting safeguards that easily, during batch production, hardware cost is low.
Description
Technical field
The invention belongs to agriculture equipment technical field, relate to a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter.
Background technique
Lifter is as a critical piece of tractor hanging, and its lifting capacity, service behaviour directly affect operation quality and the working condition of tractor implement combination.And hydraulic control valve is the power distribution unit of lifter, its performance directly governs the working stability of tractor lifting mechanism.Therefore the hydraulic control valve that design performance is excellent is requisite link in Tractor Electronic Hydraulic Hitch System lifter development process.
The hydraulic control valve design of relevant scholar to dilatory mechanical electronic hydraulic lifter is had to study at present both at home and abroad, external structure with integrated type and split blade type in the majority, valve inner structure adopts casting and machining mode to realize, hydrovalve poor universality, if casting and course of working in have a duct to occur flaw and whole valve body are scrapped.
In addition, the assembly precision of spool and valve body requires higher, should meet the leakage requirement in spool working procedure, considers because spool is out of shape the bite phenomenon produced again, considerably increase the design difficulty of hydrovalve, processing cost and manufacture cycle, significantly limit it and promote and use.
The present invention is based on modularization idea, adopt split blade type structure, by arranged apart to working connection and feedback control oil circuit, devise a multi-functional screw-in cartridge valve for the electric liquid lifter of heavy tractor.
Summary of the invention
For above problem, the object of the present invention is to provide a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter being applicable to farm work environment, its reliable operation, processing technology are simple, convenient operation and control.
In order to achieve the above object, the invention provides following technological scheme:
For a multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter, it comprises lifting control loop and multiple-channel output control loop,
Wherein, in described lifting control loop, the first spherical shuttle valve 21 comprises two filler openings and an oil outlet, and one of them filler opening is used as external loading feedback filler opening LS
iN, LS
oUTload feedback oil outlet is used as oil outlet, another filler opening is except communicating with the pressure feedback mouth of two-bit triplet proportional reversing valve 9, also communicated with the spring terminal pressure feedback mouth that has of the first Fixed differential reducing valve 11 by a fixing damping hole, in addition, the first Fixed differential reducing valve 11 has spring terminal pressure feedback mouth to fix damping hole by another one to communicate with oil return inlet T; P, A
1be followed successively by filler opening and load output oil port, pressure oil enters the filler opening of the first Fixed differential reducing valve 11 through oil inlet P, with after through the first Fixed differential reducing valve 11 oil outlet a part by its internal feedback oil duct enter the first Fixed differential reducing valve 11 without spring terminal pressure feedback mouth, another part enters the filler opening of two-bit triplet proportional reversing valve 9, and the oil outlet eventually through two-bit triplet proportional reversing valve 9 arrives load delivery outlet A
1; The filler opening of relief valve 2 and both 2/2-way proportional reversing valves 3 and load output oil port A
1communicate, both oil outlets communicate with oil return inlet T;
In described multiple-channel output control loop, the second spherical shuttle valve 22 and the 3rd spherical shuttle valve 23 respectively comprise two filler openings and an oil outlet, and one of them filler opening of the second spherical shuttle valve 22 is used as external loading feedback filler opening LS
iN, LS
oUTload feedback oil outlet is used as oil outlet, another filler opening is except communicating with the oil outlet of the 3rd spherical shuttle valve 23, also communicated with the spring terminal pressure feedback mouth that has of the second Fixed differential reducing valve 12 by a fixing damping hole, all the other two filler openings of the 3rd spherical shuttle valve 23 respectively with primary load delivery outlet A
21and B
21communicate; P and T is respectively filler opening and return opening, pressure oil enters the filler opening of the second Fixed differential reducing valve 12 through oil inlet P, with after through the second Fixed differential reducing valve 12 oil outlet a part by its internal feedback oil duct enter the second Fixed differential reducing valve 12 without spring terminal pressure feedback mouth, another part enters the filler opening of ratio hydraulicchange-over valve 7, and the commutation oil outlet eventually through ratio hydraulicchange-over valve 7 arrives primary load delivery outlet A
21and B
21; The oil outlet of ratio hydraulicchange-over valve 7 communicates with oil return inlet T, the reduce pressure oil outlet of relief valve 4 of two hydraulic pilots commutation hydraulic fluid ports of ratio hydraulicchange-over valve 7 reduce pressure respectively with the first ratio relief valve 1 and the second ratio communicates, and entered by the internal feedback oil duct of the first ratio decompression relief valve 1 and the second ratio decompression relief valve 4 and respective have spring terminal pressure feedback mouth, first ratio decompression relief valve 1 is connected with the filler opening correspondence of the second ratio decompression relief valve 4, and communicates with oil inlet P; The return opening correspondence of the first ratio decompression relief valve 1 and the second ratio decompression relief valve 4 is connected, and communicates with oil return inlet T, is entered respective without spring terminal pressure feedback mouth by its internal feedback oil duct;
An oil circuit part in described lifting control loop is arranged in front shroud 6, another part is arranged in and promotes in control loop clamping plate 5, an oil circuit part in multiple-channel output control loop is arranged in back shroud 10, another part is arranged in multiple-channel output control loop clamping plate 8, the main body of multi-functional screw-in cartridge valve is connected by four threaded stems, and the order of connection is followed successively by front shroud 6, promotes control loop clamping plate 5, multiple-channel output control loop clamping plate 8 and back shroud 10; Oil inlet P and oil return inlet T are vertical through in two kinds of loop clamping plate, and holding position is consistent, promoting the junction surface place of control loop clamping plate 5 and front shroud 6 and multiple-channel output control loop clamping plate 8, are arranged vertically load feedback output oil port LS respectively
oUTwith external loading feedback filler opening LS
iN, at multiple-channel output control loop clamping plate 8 and back shroud 10 and the junction surface place promoting control loop clamping plate 5, be arranged vertically external loading feedback filler opening LS respectively
iNwith load feedback output oil port LS
oUT, the external loading feedback filler opening LS of two loop clamping plate
iNwith load feedback output oil port LS
oUTjoin end to end, output to variable displacement pump eventually through front shroud 6;
Wherein multiple-channel output control loop clamping plate 8 can be connected with function handover module.
Described function handover module is balance valve block function module, wherein, and primary load delivery outlet A
21, B
21communicate with the filler opening of the first equilibrium valve 13 and the second equilibrium valve 14 respectively, in addition, primary load delivery outlet A
21communicate with the hydraulic pilot mouth of the second equilibrium valve 14 inside, primary load delivery outlet B
21communicate with the hydraulic pilot mouth of the first equilibrium valve 13 inside, the oil outlet of the first equilibrium valve 13 and the second equilibrium valve 14 is used separately as final stage load delivery outlet A
22, B
22.
Described function handover module is safety valve block function module, wherein, and primary load delivery outlet A
21, B
21after communicating with the filler opening of the first safety valve 15 and the second safety valve 16 respectively, be used separately as final stage load delivery outlet A
22, B
22, the oil outlet of the first safety valve 15 and the second safety valve 16 communicates with oil return inlet T.
Described function handover module is locking floating valve block function module, wherein, and the filler opening of the first Pilot operated check valve 18 and the first 2/2-way solenoid directional control valve 17 and primary load delivery outlet A
21communicate, after both oil outlet communicates, be used as final stage load delivery outlet A
22, the filler opening of the second Pilot operated check valve 19 and the second 2/2-way solenoid directional control valve 20 and primary load delivery outlet B
21communicate, after both oil outlet communicates, be used as final stage load delivery outlet B
22, in addition, the hydraulic pilot mouth of the first Pilot operated check valve 18 inside and primary load delivery outlet B
21communicate, the hydraulic pilot mouth of the second Pilot operated check valve 19 inside and primary load delivery outlet A
21communicate.
In the clamping plate assembling of described lifting control loop, the oil circuit promoted in control loop comprises and promotes control loop clamping plate internal oil passages and front shroud 6 internal oil passages two-part, wherein promotes control loop clamping plate internal oil passages and comprises and arrive load output oil port A through the filler opening of the first Fixed differential reducing valve 11 and two-bit triplet proportional reversing valve 9 and oil outlet successively by oil inlet P
1oil circuit, oil circuit that 2/2-way proportional reversing valve 3 and the oil outlet of relief valve 2 are communicated with oil return inlet T and the first Fixed differential reducing valve 11 the oil circuit having spring terminal pressure feedback mouth to be communicated with oil return inlet T through a fixing damping hole; Front shroud 6 internal oil passages comprises filler opening and the load output oil port A of relief valve 2 and 2/2-way proportional reversing valve 3
1the oil circuit be communicated with and the first Fixed differential reducing valve 11 have spring terminal pressure feedback mouth through another fixing damping hole respectively shuttle valve 21 internal load spherical with first feed back the oil circuit that filler opening is communicated with two-bit triplet proportional reversing valve 9 pressure feedback mouth;
Wherein, described oil inlet P is vertical with oil return inlet T runs through the junction surface promoting control loop clamping plate 5, load feedback oil outlet LS
oUTbe arranged vertically within the junction surface promoting control loop clamping plate 5 and front shroud 6, load output oil port A
1be arranged in clamping plate upper side, 2/2-way proportional reversing valve 3 and relief valve 2 are arranged in clamping plate left surface, and the first Fixed differential reducing valve 11 and two-bit triplet proportional reversing valve 9 are arranged in clamping plate right flank, and it is inner that the first spherical shuttle valve 21 loads clamping plate from upper side.
In the clamping plate assembling of described multiple-channel output control loop, oil circuit in multiple-channel output control loop comprises multiple-channel output control loop clamping plate internal oil passages and back shroud 10 internal oil passages two-part, and wherein multiple-channel output control loop clamping plate internal oil passages comprises and arrives primary load delivery outlet A through the filler opening of the second Fixed differential reducing valve 12 and ratio hydraulicchange-over valve 7 and oil outlet successively by oil inlet P
21and B
21reduce pressure with the first ratio respectively oil circuit that relief valve 1 is communicated with the oil outlet that the second ratio reduce pressure relief valve 4, the second spherical shuttle valve 22 filler opening warp of oil circuit, ratio hydraulicchange-over valve 7 hydraulic pilot commutation hydraulic fluid port fix the oil circuit that damping hole is communicated with the 3rd spherical shuttle valve 23 oil outlet with the oil circuit having spring terminal pressure feedback mouth to be communicated with and second spherical shuttle valve 22 filler opening of the second Fixed differential reducing valve 12; The oil circuit that filler opening and return opening that back shroud 10 internal oil passages comprises oil circuit that ratio hydraulicchange-over valve 7 return opening is communicated with oil return inlet T, the first ratio reduces pressure relief valve 1 and the second ratio reduce pressure relief valve 4 are communicated with oil return inlet T with oil inlet P successively and primary load delivery outlet A
21, B
21the oil circuit that is communicated with of two filler openings of shuttle valve 23 spherical with the 3rd respectively;
Wherein, the described oil inlet P junction surface that run through multiple-channel output control loop clamping plate 8 vertical with oil return inlet T, load feedback oil outlet LS
oUTbe arranged vertically within multiple-channel output control loop clamping plate 8 and the junction surface promoting control loop clamping plate 5, primary load delivery outlet A
21, B
21and first ratio decompression relief valve 1 and the second ratio decompression relief valve 4 be arranged in clamping plate left surface, ratio hydraulicchange-over valve 7 is arranged in clamping plate upper side, second Fixed differential reducing valve 12 is arranged in clamping plate right flank, and it is inner that the second spherical shuttle valve 22 and the 3rd spherical shuttle valve 23 load clamping plate from upper side and right flank respectively.
The Maximum operating pressure of described lifting control loop design is 25Mpa, and rated flow is 80L/Min.
The Maximum operating pressure of described multiple-channel output control loop design is 25Mpa, and rated flow is 80L/Min.
Compared with prior art, beneficial effect of the present invention is:
Invention increases the adaptability of electro-hydraulic hitch hydraulic system, have the design cycle short, convenient for installation and maintenance, leak less, vibrate little, reliable operation, be beneficial to the integrated and standardized advantage realizing typical hydraulic system; Add the on-the-spot flexibility of adding and changing loop, traditional hydraulic manifold block can be replaced, for heavy tractor electricity liquid lifter performance test provides great convenience; Processing technology is simple, replaces the casting technique of existing complex and expensive, and dismounting safeguards that easily, during batch production, hardware cost is low.
Accompanying drawing explanation
Fig. 1 a is the schematic diagram promoting control loop;
Fig. 1 b is the schematic diagram of multiple-channel output control loop;
Fig. 2 a is the multiple-channel output control loop schematic diagram of band balance valve block function module;
Fig. 2 b is the multiple-channel output control loop schematic diagram of band safety valve block function module;
Fig. 2 c is the multiple-channel output control loop schematic diagram of locking floating valve block function module;
Fig. 3 is the main body schematic diagram of multi-functional screw-in cartridge valve;
Fig. 4 is for promoting control loop clamping plate erection drawing;
Fig. 5 is multiple-channel output control loop clamping plate erection drawings;
Fig. 6 is front shroud schematic appearance;
Fig. 7 is back shroud schematic appearance;
Fig. 8 is the balance valve block schematic diagram in function handover module;
Fig. 9 is the safety valve block schematic diagram in function handover module;
Figure 10 is the locking floating valve block schematic diagram in function handover module.
[primary clustering symbol description]
1 first ratio decompression relief valve
2 relief valves
3 2/2-way proportional reversing valves
4 second ratio decompression relief valves
5 promote control loop clamping plate
6 front shrouds
7 ratio hydraulicchange-over valves
8 multiple-channel output control loop clamping plate
9 two-bit triplet proportional reversing valves
10 back shrouds
11 first Fixed differential reducing valves
12 second Fixed differential reducing valves
13 first equilibrium valves
14 second equilibrium valves
15 first safety valves
16 second safety valves
17 first 2/2-way solenoid directional control valves
18 first Pilot operated check valves
19 second Pilot operated check valves
20 second 2/2-way solenoid directional control valves
21 first spherical shuttle valves
22 second spherical shuttle valves
23 the 3rd spherical shuttle valves
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter of the present invention is applicable to the load feedback hydraulic system with variable displacement pump, can be used for different operating load and controls, as single-action hydraulic cylinder, double-acting hydraulic cylinder and oil hydraulic motor.
As shown in Figure 3, be the main body schematic diagram of multi-functional screw-in cartridge valve of the present invention, described multi-functional screw-in cartridge valve comprises lifting control loop and multiple-channel output control loop, for different loaded work piece occasions, present invention also adds function handover module.
Wherein, as shown in Figure 1a, be the schematic diagram of described lifting control loop, this lifting control loop is used for farm tractor lift arm single-action hydraulic cylinder elevating control, and the Maximum operating pressure of design is 25Mpa, and rated flow is 80L/Min.
Wherein, the first spherical shuttle valve 21 comprises two filler openings and an oil outlet, and one of them filler opening is used as external loading feedback filler opening LS
iN, oil outlet LS
oUTas load feedback oil outlet, another filler opening is except communicating with the pressure feedback mouth of two-bit triplet proportional reversing valve 9, also communicated with the spring terminal pressure feedback mouth that has of the first Fixed differential reducing valve 11 by a fixing damping hole, alleviate the feedback port pressure of two-bit triplet proportional reversing valve 9 to the impact of the first Fixed differential reducing valve 11 spool.In addition, the first Fixed differential reducing valve 11 has spring terminal pressure feedback mouth to fix damping hole by another one to communicate with oil return inlet T, prevent the spring terminal pressure feedback mouth that has of the first Fixed differential reducing valve 11 in pressure compensation process from blocking.P, A
1be followed successively by filler opening and load output oil port, pressure oil enters the filler opening of the first Fixed differential reducing valve 11 through oil inlet P, with after through the oil outlet of the first Fixed differential reducing valve 11, a part through a fixing damping hole by its internal feedback oil duct enter the first Fixed differential reducing valve 11 without spring terminal pressure feedback mouth, another part enters the filler opening of two-bit triplet proportional reversing valve 9, and the oil outlet eventually through two-bit triplet proportional reversing valve 9 arrives load delivery outlet A
1.The filler opening of relief valve 2 and both 2/2-way proportional reversing valves 3 and load output oil port A
1communicate, both oil outlets communicate with oil return inlet T, and relief valve 2 cracking pressure is 20Mpa, closes during normality, are communicated with load output oil port A during overload
1and oil return inlet T, there is safety protection function.In the event of a power failure, internal one-way valve locking, prevents fluid from refluxing for 2/2-way proportional reversing valve 3 and two-bit triplet proportional reversing valve 9.Pressure reduction between charge oil pressure and induced pressure maintains within the scope of 1.1Mpa by the first Fixed differential reducing valve 11, the feedback port pressure of two-bit triplet proportional reversing valve 9 and external loading pressure are compared, by elevated pressures through load feedback oil outlet LS by the first spherical shuttle valve 21
oUTfeed back in variable displacement pump, the working pressure of variable displacement pump is changed with the change of maximum load pressure, there is load-sensitive function, reduce the power consumption of system.
As shown in Figure 4, be the clamping plate erection drawing of described lifting control loop, wherein, described oil inlet P is vertical with oil return inlet T runs through the junction surface promoting control loop clamping plate 5, load feedback oil outlet LS
oUTbe arranged vertically within the junction surface promoting control loop clamping plate 5 and front shroud 6, load output oil port A
1be arranged in clamping plate upper side, 2/2-way proportional reversing valve 3 and relief valve 2 are arranged in clamping plate left surface, and the first Fixed differential reducing valve 11 and two-bit triplet proportional reversing valve 9 are arranged in clamping plate right flank, and it is inner that the first spherical shuttle valve 21 loads clamping plate from upper side.
The oil circuit promoted in control loop comprises and promotes control loop clamping plate internal oil passages and front shroud 6 internal oil passages two-part, wherein promotes control loop clamping plate internal oil passages and comprises and arrive load output oil port A through the filler opening of the first Fixed differential reducing valve 11 and two-bit triplet proportional reversing valve 9 and oil outlet successively by oil inlet P
1oil circuit, oil circuit that 2/2-way proportional reversing valve 3 and the oil outlet of relief valve 2 are communicated with oil return inlet T and the first Fixed differential reducing valve 11 the oil circuit having spring terminal pressure feedback mouth to be communicated with oil return inlet T through a fixing damping hole; Front shroud 6 internal oil passages comprises filler opening and the load output oil port A of relief valve 2 and 2/2-way proportional reversing valve 3
1the oil circuit be communicated with, the first Fixed differential reducing valve 11 have spring terminal pressure feedback mouth through another fixing damping hole respectively shuttle valve 21 internal load spherical with first feed back the oil circuit that filler opening is communicated with two-bit triplet proportional reversing valve 9 pressure feedback mouth.
As shown in Figure 1 b, be the schematic diagram of multiple-channel output control loop, described multiple-channel output control loop is used for carrying out the control of fluid power multiple-channel output to hydraulic power, and the Maximum operating pressure of design is 25Mpa, and rated flow is 80L/Min.
Wherein, the second spherical shuttle valve 22 and the 3rd spherical shuttle valve 23 respectively comprise two filler openings and an oil outlet, and one of them filler opening of the second spherical shuttle valve 22 is used as external loading feedback filler opening LS
iN, oil outlet LS
oUTas load feedback oil outlet, another filler opening is except communicating with the oil outlet of the 3rd spherical shuttle valve 23, also communicated with the spring terminal pressure feedback mouth that has of the second Fixed differential reducing valve 12 by a fixing damping hole, alleviate the impact of load feedback pressure to the second Fixed differential reducing valve 12 spool.All the other two filler openings of 3rd spherical shuttle valve 23 respectively with primary load delivery outlet A
21and B
21communicate.P and T is respectively filler opening and return opening, pressure oil enters the filler opening of the second Fixed differential reducing valve 12 through oil inlet P, with after through the second Fixed differential reducing valve 12 oil outlet a part through a fixing damping hole by its internal feedback oil duct enter the second Fixed differential reducing valve 12 without spring terminal pressure feedback mouth, another part enters the filler opening of ratio hydraulicchange-over valve 7, and the commutation oil outlet eventually through ratio hydraulicchange-over valve 7 arrives primary load delivery outlet A
21and B
21.The oil outlet of ratio hydraulicchange-over valve 7 communicates with oil return inlet T, the reduce pressure oil outlet of relief valve 4 of two hydraulic pilots commutation hydraulic fluid ports of ratio hydraulicchange-over valve 7 reduce pressure respectively with the first ratio relief valve 1 and the second ratio communicates, and is entered respective had spring terminal pressure feedback mouth by the first ratio reduce pressure internal feedback oil duct of relief valve 4 of relief valve 1 and the second ratio that reduces pressure.First ratio decompression relief valve 1 is connected with the filler opening correspondence of the second ratio decompression relief valve 4, and communicates with oil inlet P; The return opening correspondence of the first ratio decompression relief valve 1 and the second ratio decompression relief valve 4 is connected, and communicates with oil return inlet T, is entered respective without spring terminal pressure feedback mouth by its internal feedback oil duct.Pressure reduction between charge oil pressure and induced pressure maintains within the scope of 1.1Mpa by the second Fixed differential reducing valve 12, realize load pressure compensation function, ratio hydraulicchange-over valve 7, first ratio decompression relief valve 1 and the second ratio decompression relief valve 4 realize load-commutated function jointly, and the 3rd spherical shuttle valve 23 is for comparing primary load delivery outlet A
21and B
21pressure, and elevated pressures compared as the internal load feed back input of the second spherical shuttle valve 22 and the pressure of external loading feed back input, the highest load pressure feedback, to variable displacement pump, realizes load-sensitive function, reduces the power consumption of system.
As shown in Figure 5, be the clamping plate erection drawing of described multiple-channel output control loop, wherein, the described oil inlet P junction surface that run through multiple-channel output control loop clamping plate 8 vertical with oil return inlet T, load feedback oil outlet LS
oUTbe arranged vertically within multiple-channel output control loop clamping plate 8 and the junction surface promoting control loop clamping plate 5, primary load delivery outlet A
21, B
21and first ratio decompression relief valve 1 and the second ratio decompression relief valve 4 be arranged in clamping plate left surface, ratio hydraulicchange-over valve 7 is arranged in clamping plate upper side, second Fixed differential reducing valve 12 is arranged in clamping plate right flank, and it is inner that the second spherical shuttle valve 22 and the 3rd spherical shuttle valve 23 load clamping plate from upper side and right flank respectively.
Oil circuit in multiple-channel output control loop comprises multiple-channel output control loop clamping plate internal oil passages and back shroud 10 internal oil passages two-part, and wherein multiple-channel output control loop clamping plate internal oil passages comprises and arrives primary load delivery outlet A through the filler opening of the second Fixed differential reducing valve 12 and ratio hydraulicchange-over valve 7 and oil outlet successively by oil inlet P
21and B
21oil circuit, ratio hydraulicchange-over valve 7 reduce pressure with the first ratio respectively oil circuit that relief valve 1 is communicated with the oil outlet that the second ratio reduce pressure relief valve 4, the second spherical shuttle valve 22 filler opening warp of hydraulic pilot commutation hydraulic fluid port fix the oil circuit that damping hole is communicated with the 3rd spherical shuttle valve 23 oil outlet with the oil circuit having spring terminal pressure feedback mouth to be communicated with and second spherical shuttle valve 22 filler opening of the second Fixed differential reducing valve 12; The reduce pressure filler opening of relief valve 4 of back shroud 10 internal oil passages comprises oil circuit that ratio hydraulicchange-over valve 7 return opening is communicated with oil return inlet T, the first ratio reduces pressure relief valve 1 and the second ratio is connected and the oil circuit communicated with oil inlet P, first ratio decompression relief valve 1 is connected and the oil circuit be communicated with oil return inlet T with the return opening of the second ratio decompression relief valve 4, and primary load delivery outlet A
21, B
21the oil circuit that is communicated with of two filler openings of shuttle valve 23 spherical with the 3rd respectively.
An oil circuit part in described lifting control loop is arranged in front shroud 6, another part is arranged in and promotes in control loop clamping plate 5, an oil circuit part in multiple-channel output control loop is arranged in back shroud 10, another part is arranged in multiple-channel output control loop clamping plate 8, the main body of multi-functional screw-in cartridge valve is connected by four threaded stems, and the order of connection is followed successively by front shroud 6, promotes control loop clamping plate 5, multiple-channel output control loop clamping plate 8 and back shroud 10.Oil inlet P and oil return inlet T are vertical through in two kinds of loop clamping plate, and holding position is consistent, promoting the junction surface place of control loop clamping plate 5 and front shroud 6 and multiple-channel output control loop clamping plate 8, are arranged vertically load feedback output oil port LS respectively
oUTwith external loading feedback filler opening LS
iN, at multiple-channel output control loop clamping plate 8 and back shroud 10 and the junction surface place promoting control loop clamping plate 5, be arranged vertically external loading feedback filler opening LS respectively
iNwith load feedback output oil port LS
oUT, the external loading feedback filler opening LS of two loop clamping plate
iNwith load feedback output oil port LS
oUTjoin end to end, output to variable displacement pump eventually through front shroud 6, realize load-sensitive function.
Multiple-channel output control loop clamping plate 8 can be connected the control realized different operating load with function handover module.
As shown in Figure 2 a, be the multiple-channel output control loop schematic diagram of band balance valve block function module, wherein, primary load delivery outlet A
21, B
21communicate with the filler opening of the first equilibrium valve 13 and the second equilibrium valve 14 respectively, in addition, primary load delivery outlet A
21communicate with the hydraulic pilot mouth of the second equilibrium valve 14 inside, primary load delivery outlet B
21communicate with the hydraulic pilot mouth of the first equilibrium valve 13 inside, the oil outlet of the first equilibrium valve 13 and the second equilibrium valve 14 is used separately as final stage load delivery outlet A
22, B
22.Fig. 8 is the balance valve block schematic diagram in function handover module, and the first equilibrium valve 13 and the second equilibrium valve 14 are arranged in valve block upper side, the primary load delivery outlet A on multiple-channel output control loop clamping plate 8
21and B
21by balance valve block just after two filler openings connect with the filler opening of the first equilibrium valve 13 and the second equilibrium valve 14 respectively, final stage load output oil port A
22, B
22be arranged in balance valve block just before.
As shown in Figure 2 b, be the multiple-channel output control loop schematic diagram of band safety valve block function module, wherein, primary load delivery outlet A
21, B
21after communicating with the filler opening of the first safety valve 15 and the second safety valve 16 respectively, be used separately as final stage load delivery outlet A
22, B
22, the oil outlet of the first safety valve 15 and the second safety valve 16 communicates with oil return inlet T; Fig. 9 is the safety valve block schematic diagram in function handover module, and the first safety valve 15 and the second safety valve 16 are arranged in valve block upper side, the primary load delivery outlet A on multiple-channel output control loop clamping plate 8
21and B
21by safety valve block just after two filler openings connect with the filler opening of the first safety valve 15 and the second safety valve 16 respectively, the oil return inlet T of safety valve block right flank is linked into the oil return inlet T of front shroud 6 upper side, final stage load output oil port A
22, B
22be arranged in valve block just before.
As shown in Figure 2 c, be the multiple-channel output control loop schematic diagram of locking floating valve block function module, wherein, the filler opening of the first Pilot operated check valve 18 and the first 2/2-way solenoid directional control valve 17 and primary load delivery outlet A
21communicate, after both oil outlet communicates, be used as final stage load delivery outlet A
22, the filler opening of the second Pilot operated check valve 19 and the second 2/2-way solenoid directional control valve 20 and primary load delivery outlet B
21communicate, after both oil outlet communicates, be used as final stage load delivery outlet B
22, in addition, the hydraulic pilot mouth of the first Pilot operated check valve 18 inside and primary load delivery outlet B
21communicate, the hydraulic pilot mouth of the second Pilot operated check valve 19 inside and primary load delivery outlet A
21communicate; Figure 10 is the locking floating valve block schematic diagram in function handover module, and the first Pilot operated check valve 18 and the second Pilot operated check valve 19 are arranged in valve block right flank, the primary load delivery outlet A on multiple-channel output control loop clamping plate 8
21and B
21by locking floating valve block just before two filler openings connect with the filler opening of the first Pilot operated check valve 18 and the second Pilot operated check valve 19 respectively, first 2/2-way solenoid directional control valve 17 and the second 2/2-way solenoid directional control valve 20 are arranged in valve block upper side and downside respectively, final stage load output oil port A
22, B
22be arranged in valve block left surface.
Multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter of the present invention operationally, wherein:
In described lifting control loop, before work, 2/2-way proportional reversing valve 3 and two-bit triplet proportional reversing valve 9 are in off-position.When two-bit triplet proportional reversing valve 9 is energized, its right position work, the pressure oil exported by variable displacement pump enters two-bit triplet proportional reversing valve 9 after the first Fixed differential reducing valve 11 reduces pressure, wherein a part is used for feedback load pressure, the pressure feedback mouth of the first Fixed differential reducing valve 11 is arrived through fixing damping hole, meanwhile, intrasystem induced pressure compares with external system loop load pressure through the first spherical shuttle valve 21, by maximum load pressure feedback to variable displacement pump, its delivery pressure is changed with induced pressure change; Another part is through A
1mouth is used for load and exports, and now lift arm oil hydraulic cylinder stretches out, and promotes and hangs farm implements, and lifting speed is not subject to induced pressure variable effect, only relevant with two-bit triplet proportional reversing valve 9 aperture.After two-bit triplet proportional reversing valve 9 power-off, locking hangs farm implements, and fluid flows to from P to A
1; After 2/2-way proportional reversing valve 3 is energized, its left position work, fluid is through load delivery outlet A
1with 2/2-way proportional reversing valve 3 oil sump tank, now lift arm oil hydraulic cylinder is retracted, and hang farm implements and decline, rate of descent regulates by the valve port opening changing 2/2-way proportional reversing valve 3, and fluid flows to from A
1to T.
In multiple-channel output control loop, before work, the first ratio decompression relief valve 1 and the second ratio decompression relief valve 4 are in off-position, and ratio hydraulicchange-over valve 7 is in meta, primary load delivery outlet A
21, B
21be connected with oil return inlet T, when the first ratio decompression relief valve 1 is energized, its left position work, the pressure oil exported by variable displacement pump enters the first ratio decompression relief valve 1, and then the ratio of arrival hydraulicchange-over valve 7 hydraulic pilot mouth, make its left position work, fluid flows back to fuel tank through function after Zone switched and external loading, and fluid flows to as from P to A
21with from B
21to T; In like manner, when the second ratio decompression relief valve 4 is energized, its right position work, working procedure is the same, and fluid flows to as from P to B
21with from A
21to T.In system, induced pressure arrives the second Fixed differential reducing valve 12 pressure feedback mouth by the 3rd spherical shuttle valve 23 through fixing damping hole, meanwhile, intrasystem induced pressure is compared with external system induced pressure by the second spherical shuttle valve 22, through by maximum load pressure feedback to variable displacement pump, its delivery pressure is changed with induced pressure change, load output flow is only relevant with the valve port opening of ratio hydraulicchange-over valve 7, not by induced pressure variable effect.
In function is Zone switched, as primary load delivery outlet A
21, B
21when being communicated with the filler opening of the second equilibrium valve 14 with the first equilibrium valve 13 separately, if pilot operated directional control valve 7 left position work, the one-way valve opens in the first equilibrium valve 13, final stage load delivery outlet A
22fuel-displaced, the relief valve in the second equilibrium valve 14 opened by induced pressure oil by the hydraulic pilot mouth of the second equilibrium valve 14 inside simultaneously, final stage load delivery outlet B
22oil return, vice versa, can be used for oil hydraulic motor and double-acting hydraulic cylinder control, have braking and overload protection function; As primary load delivery outlet A
21, B
21during the filler opening of each self-closing first safety valve 15 and the second safety valve 16, can be used as final stage load delivery outlet A
22, B
22, the oil outlet of the first safety valve 15 with the second safety valve 16 is connected with oil return inlet T, as final stage load delivery outlet A
22, B
22during overpressure, the first safety valve 15 and the second safety valve 16 are opened, and high pressure oil overflows back fuel tank, can be used for controlling without static load oil hydraulic cylinder, have overload protection function; As primary load delivery outlet A
21, B
21during the filler opening of the filler opening of each self-closing first Pilot operated check valve 18 and the first 2/2-way solenoid directional control valve 17 and the second Pilot operated check valve 19 and the second 2/2-way solenoid directional control valve 20, when the first 2/2-way solenoid directional control valve 17 and the second 2/2-way solenoid directional control valve 20 power-off, final stage load output oil port A
22, B
22be in locking state, on the contrary the quick condition of being in, and if pilot operated directional control valve 7 right position work, the second Pilot operated check valve 19 is opened, final stage load output oil port B
22mouth oil-feed, induced pressure oil opens the first Pilot operated check valve 18 by the hydraulic pilot mouth of the first Pilot operated check valve 18 inside, final stage load output oil port A
22mouth oil return, vice versa, can be used for double acting cylinder and control, have locking and float function.
Claims (8)
1., for a multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter, it is characterized in that:
It comprises lifting control loop and multiple-channel output control loop,
Wherein, in described lifting control loop, the first spherical shuttle valve (21) comprises two filler openings and an oil outlet, and one of them filler opening is used as external loading feedback filler opening LS
iN, LS
oUTload feedback oil outlet is used as oil outlet, another filler opening is except communicating with the pressure feedback mouth of two-bit triplet proportional reversing valve (9), also communicated with the spring terminal pressure feedback mouth that has of the first Fixed differential reducing valve (11) by a fixing damping hole, in addition, the first Fixed differential reducing valve (11) has spring terminal pressure feedback mouth to fix damping hole by another one to communicate with oil return inlet T; P, A
1be followed successively by filler opening and load output oil port, pressure oil enters the filler opening of the first Fixed differential reducing valve (11) through oil inlet P, with after through the first Fixed differential reducing valve (11) oil outlet a part by its internal feedback oil duct enter the first Fixed differential reducing valve (11) without spring terminal pressure feedback mouth, another part enters the filler opening of two-bit triplet proportional reversing valve (9), and the oil outlet eventually through two-bit triplet proportional reversing valve (9) arrives load delivery outlet A
1; Relief valve (2) and 2/2-way proportional reversing valve (3) both filler openings and load output oil port A
1communicate, both oil outlets communicate with oil return inlet T;
In described multiple-channel output control loop, second spherical shuttle valve (22) and the 3rd spherical shuttle valve (23) respectively comprise two filler openings and an oil outlet, and a filler opening in the second spherical shuttle valve (22) is used as external loading feedback filler opening LS
iN, LS
oUTload feedback oil outlet is used as oil outlet, another filler opening is except communicating with the oil outlet of the 3rd spherical shuttle valve (23), also communicated with the spring terminal pressure feedback mouth that has of the second Fixed differential reducing valve (12) by a fixing damping hole, all the other two filler openings of the 3rd spherical shuttle valve (23) respectively with primary load delivery outlet A
21and B
21communicate; P and T is respectively filler opening and return opening, pressure oil enters the filler opening of the second Fixed differential reducing valve (12) through oil inlet P, with after through the second Fixed differential reducing valve (12) oil outlet a part by its internal feedback oil duct enter the second Fixed differential reducing valve (12) without spring terminal pressure feedback mouth, another part enters the filler opening of ratio hydraulicchange-over valve (7), and the commutation oil outlet eventually through ratio hydraulicchange-over valve (7) arrives primary load delivery outlet A
21and B
21; The oil outlet of ratio hydraulicchange-over valve (7) communicates with oil return inlet T, the reduce pressure oil outlet of relief valve (4) of two hydraulic pilots commutation hydraulic fluid ports of ratio hydraulicchange-over valve (7) reduce pressure respectively with the first ratio relief valve (1) and the second ratio communicates, and enter respective have spring terminal pressure feedback mouth by the reduce pressure internal feedback oil duct of relief valve (4) of the first ratio decompression relief valve (1) and the second ratio, first ratio decompression relief valve (1) is connected with the filler opening correspondence of the second ratio decompression relief valve (4), and communicates with oil inlet P; The return opening of the first ratio decompression relief valve (1) and the second ratio decompression relief valve (4) is corresponding to be connected, and communicates with oil return inlet T, is entered respective without spring terminal pressure feedback mouth by its internal feedback oil duct;
An oil circuit part in described lifting control loop is arranged in front shroud (6), another part is arranged in and promotes in control loop clamping plate (5), an oil circuit part in multiple-channel output control loop is arranged in back shroud (10), another part is arranged in multiple-channel output control loop clamping plate (8), the main body of multi-functional screw-in cartridge valve is connected by four threaded stems, and the order of connection is followed successively by front shroud (6), promotes control loop clamping plate (5), multiple-channel output control loop clamping plate (8) and back shroud (10); Oil inlet P and oil return inlet T are vertical through in two kinds of loop clamping plate, position is consistent, promoting the junction surface place of control loop clamping plate (5) and front shroud (6) and multiple-channel output control loop clamping plate (8), be arranged vertically load feedback output oil port LS respectively
oUTwith external loading feedback filler opening LS
iN, at multiple-channel output control loop clamping plate (8) and back shroud (10) and the junction surface place promoting control loop clamping plate (5), be arranged vertically external loading feedback filler opening LS respectively
iNwith load feedback output oil port LS
oUT, the external loading feedback filler opening LS of two loop clamping plate
iNwith load feedback output oil port LS
oUTjoin end to end, output to variable displacement pump eventually through front shroud (6);
Wherein multiple-channel output control loop clamping plate (8) are connected with function handover module.
2. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as claimed in claim 1, is characterized in that:
Described function handover module is balance valve block function module, wherein, and primary load delivery outlet A
21, B
21communicate with the filler opening of the first equilibrium valve (13) and the second equilibrium valve (14) respectively, in addition, primary load delivery outlet A
21the hydraulic pilot mouth inner with the second equilibrium valve (14) communicates, primary load delivery outlet B
21the hydraulic pilot mouth inner with the first equilibrium valve (13) communicates, and the oil outlet of the first equilibrium valve (13) and the second equilibrium valve (14) is used separately as final stage load delivery outlet A
22, B
22.
3. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as claimed in claim 1, is characterized in that:
Described function handover module is safety valve block function module, wherein, and primary load delivery outlet A
21, B
21after communicating with the filler opening of the first safety valve (15) and the second safety valve (16) respectively, be used separately as final stage load delivery outlet A
22, B
22, the oil outlet of the first safety valve (15) and the second safety valve (16) communicates with oil return inlet T.
4. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as claimed in claim 1, is characterized in that:
Described function handover module is locking floating valve block function module, wherein, and the filler opening of the first Pilot operated check valve (18) and the first 2/2-way solenoid directional control valve (17) and primary load delivery outlet A
21communicate, after both oil outlet communicates, be used as final stage load delivery outlet A
22, the filler opening of the second Pilot operated check valve (19) and the second 2/2-way solenoid directional control valve (20) and primary load delivery outlet B
21communicate, after both oil outlet communicates, be used as final stage load delivery outlet B
22, in addition, the hydraulic pilot mouth that the first Pilot operated check valve (18) is inner and primary load delivery outlet B
21communicate, the hydraulic pilot mouth that the second Pilot operated check valve (19) is inner and primary load delivery outlet A
21communicate.
5. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as described in one of claim 1-4, is characterized in that:
In the clamping plate assembling of described lifting control loop, the oil circuit promoted in control loop comprises and promotes control loop clamping plate internal oil passages and front shroud (6) internal oil passages two-part, wherein promotes control loop clamping plate internal oil passages and comprises by oil inlet P successively through filler opening and the oil outlet arrival load output oil port A of the first Fixed differential reducing valve (11) and two-bit triplet proportional reversing valve (9)
1oil circuit, oil circuit that 2/2-way proportional reversing valve (3) and the oil outlet of relief valve (2) are communicated with oil return inlet T and the first Fixed differential reducing valve (11) the oil circuit having spring terminal pressure feedback mouth to be communicated with oil return inlet T through a fixing damping hole; Front shroud (6) internal oil passages comprises filler opening and the load output oil port A of relief valve (2) and 2/2-way proportional reversing valve (3)
1the oil circuit be communicated with and the first Fixed differential reducing valve (11) have spring terminal pressure feedback mouth through another fixing damping hole respectively shuttle valve (21) internal load spherical with first feed back the oil circuit that filler opening is communicated with two-bit triplet proportional reversing valve (9) pressure feedback mouth;
Wherein, described oil inlet P is vertical with oil return inlet T runs through the junction surface promoting control loop clamping plate (5), load feedback oil outlet LS
oUTbe arranged vertically within the junction surface promoting control loop clamping plate (5) and front shroud (6), load output oil port A
1be arranged in clamping plate upper side, 2/2-way proportional reversing valve (3) and relief valve (2) are arranged in clamping plate left surface, first Fixed differential reducing valve (11) and two-bit triplet proportional reversing valve (9) are arranged in clamping plate right flank, and it is inner that the first spherical shuttle valve (21) loads clamping plate from upper side.
6. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as described in one of claim 1-4, is characterized in that:
In the clamping plate assembling of described multiple-channel output control loop, oil circuit in multiple-channel output control loop comprises multiple-channel output control loop clamping plate internal oil passages and back shroud (10) internal oil passages two-part, and wherein multiple-channel output control loop clamping plate internal oil passages comprises and arrives primary load delivery outlet A through the filler opening of the second Fixed differential reducing valve (12) and ratio hydraulicchange-over valve (7) and oil outlet successively by oil inlet P
21and B
21reduce pressure with the first ratio respectively oil circuit that relief valve (1) is communicated with the oil outlet that the second ratio reduces pressure relief valve (4), the second spherical shuttle valve (22) filler opening warp of oil circuit, ratio hydraulicchange-over valve (7) hydraulic pilot commutation hydraulic fluid port fix the oil circuit that damping hole is communicated with the 3rd spherical shuttle valve (23) oil outlet with the oil circuit having spring terminal pressure feedback mouth to be communicated with and second spherical shuttle valve (22) filler opening of the second Fixed differential reducing valve (12); The oil circuit that filler opening and return opening that back shroud (10) internal oil passages comprises oil circuit that ratio hydraulicchange-over valve (7) return opening is communicated with oil return inlet T, the first ratio reduces pressure relief valve (1) and the second ratio reduce pressure relief valve (4) are communicated with oil return inlet T with oil inlet P successively and primary load delivery outlet A
21, B
21the oil circuit be communicated with two filler openings of the 3rd spherical shuttle valve (23) respectively;
Wherein, the described oil inlet P junction surface that run through multiple-channel output control loop clamping plate (8) vertical with oil return inlet T, load feedback oil outlet LS
oUTbe arranged vertically within multiple-channel output control loop clamping plate (8) and the junction surface promoting control loop clamping plate (5), primary load delivery outlet A
21, B
21and first ratio decompression relief valve (1) and the second ratio reduce pressure relief valve (4) be arranged in clamping plate left surface, ratio hydraulicchange-over valve (7) is arranged in clamping plate upper side, second Fixed differential reducing valve (12) is arranged in clamping plate right flank, and it is inner that the second spherical shuttle valve (22) and the 3rd spherical shuttle valve (23) load clamping plate from upper side and right flank respectively.
7. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as described in one of claim 1-4, is characterized in that:
The Maximum operating pressure of described lifting control loop design is 25Mpa, and rated flow is 80L/Min.
8. a kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter as described in one of claim 1-4, is characterized in that:
The Maximum operating pressure of described multiple-channel output control loop design is 25Mpa, and rated flow is 80L/Min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410459758.1A CN104196803B (en) | 2014-09-11 | 2014-09-11 | A kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410459758.1A CN104196803B (en) | 2014-09-11 | 2014-09-11 | A kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter |
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| Publication Number | Publication Date |
|---|---|
| CN104196803A CN104196803A (en) | 2014-12-10 |
| CN104196803B true CN104196803B (en) | 2016-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410459758.1A Expired - Fee Related CN104196803B (en) | 2014-09-11 | 2014-09-11 | A kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104832483B (en) * | 2015-05-08 | 2017-03-29 | 日照海卓液压有限公司 | The integrated oil sources management system of Modular Flexible |
| CN104847747B (en) * | 2015-05-08 | 2017-05-17 | 日照海卓液压有限公司 | Modularized flexible hydraulic loop having anti-cavitation function |
| CN105298967B (en) * | 2015-11-20 | 2017-08-29 | 湖州生力液压有限公司 | A kind of big-powered tractor lifter valve group |
| CN106122141B (en) * | 2016-05-31 | 2018-04-03 | 上海人豪液压技术有限公司 | Using modularization can combo inserted valve RHCV combination electrichydraulic control terminal |
| CN107191421B (en) * | 2017-07-05 | 2018-10-30 | 江苏常发农业装备股份有限公司 | A kind of lifter control device |
| CN107228771B (en) * | 2017-07-17 | 2023-06-27 | 中国农业大学 | Tractor plough farming industry performance test and control system and method |
| CN109139591B (en) * | 2018-09-25 | 2020-03-10 | 中国农业大学 | Mountain and hill self-adaptation pilot-operated type electro-hydraulic proportional threaded cartridge valve |
| CN109986352B (en) * | 2019-03-29 | 2023-09-19 | 广东利元亨智能装备股份有限公司 | Oil circuit board assembly production line and assembly process thereof |
| CN113685388B (en) * | 2021-07-19 | 2023-12-12 | 北京天玛智控科技股份有限公司 | Water-based proportional pressure-reducing overflow valve |
| CN114658882A (en) * | 2022-03-16 | 2022-06-24 | 浙江海宏液压科技股份有限公司 | Heat dissipation control valve and heat dissipation system |
| CN115263839B (en) * | 2022-07-27 | 2024-06-14 | 江苏汇智高端工程机械创新中心有限公司 | Electrohydraulic valve for tractor lifting system, tractor lifting system and tractor |
| DE102023104693A1 (en) * | 2023-02-27 | 2024-08-29 | Deere & Company | Hydraulic arrangement for supplying an attachment with hydraulic power |
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| DE10138389A1 (en) * | 2001-08-04 | 2003-02-20 | Bosch Gmbh Robert | Electro-hydraulic device for controlling a double-acting motor |
| DE102009031493A1 (en) * | 2009-07-02 | 2011-01-05 | Robert Bosch Gmbh | valve assembly |
| CN202001417U (en) * | 2011-04-08 | 2011-10-05 | 湖州生力液压有限公司 | Hydraulic integrated valve for agricultural tractor |
| CN202579387U (en) * | 2011-09-28 | 2012-12-05 | 上海人豪液压技术有限公司 | A threaded cartridge valve installation hole and an electronic control valve electromagnet employing a novel-structure hydraulic component threaded connection oil port unit, and a threaded cartridge valve |
| JP5860711B2 (en) * | 2012-02-03 | 2016-02-16 | Ｋｙｂ株式会社 | Fluid pressure control device |
| CN202628646U (en) * | 2012-05-24 | 2012-12-26 | 山东弘宇机械有限公司 | Hydraulic hanging controlling valve for tractor |
| DE102012208944A1 (en) * | 2012-05-29 | 2013-12-05 | Robert Bosch Gmbh | Hydrostatic valve assembly and hydrostatic control assembly with the valve assembly |
| CN102913495B (en) * | 2012-09-28 | 2015-05-20 | 上海人豪液压技术有限公司 | Modularized combined electric-hydraulic multitandem valve system adopting compact type two way cartridge valve |
| CN203453167U (en) * | 2013-08-30 | 2014-02-26 | 第一拖拉机股份有限公司 | Power reversing inching valve block for tractor |
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