CN108626193A - A kind of cartridge valve - Google Patents

A kind of cartridge valve Download PDF

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Publication number
CN108626193A
CN108626193A CN201810485265.3A CN201810485265A CN108626193A CN 108626193 A CN108626193 A CN 108626193A CN 201810485265 A CN201810485265 A CN 201810485265A CN 108626193 A CN108626193 A CN 108626193A
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CN
China
Prior art keywords
valve
control chamber
actuator port
valve core
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201810485265.3A
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Chinese (zh)
Other versions
CN108626193B (en
Inventor
邵立坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Yichuang Semiconductor Technology Co ltd
Original Assignee
Ningbo Zhen Ge Hydraulic Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CN201810485265.3A priority Critical patent/CN108626193B/en
Publication of CN108626193A publication Critical patent/CN108626193A/en
Application granted granted Critical
Publication of CN108626193B publication Critical patent/CN108626193B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401Valve members; Fluid interconnections therefor
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01BSOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B15/00Elements, tools, or details of ploughs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401Valve members; Fluid interconnections therefor
    • F15B13/0402Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B2013/002Modular valves, i.e. consisting of an assembly of interchangeable components
    • F15B2013/004Cartridge valves

Abstract

The present invention relates to a kind of cartridge valves, it is characterised in that:Including valve pocket, valve pocket is equipped with oil inlet, oil return opening, the first actuator port and the second actuator port;First passage, first passage is interior to be equipped with reversing valve core, and forms main control chamber in the first passage of reversing valve core side, and the first passage of the other side forms secondary control chamber;Second channel, to be connected to the second actuator port and secondary control chamber;Overflow valve is arranged on second channel and opens the second logical after the second actuator port pressure reaches certain value, overflow valve unlatching with normal off, and fluid is by the second actuator port inflow main control chamber.It is a kind of cartridge valve that is simple and reasonable, at low cost, can automatically controlling pivot plow overturning.

Description

A kind of cartridge valve
Technical field
The invention belongs to valve technology field more particularly to a kind of cartridge valves.
Background technology
In recent years, China's most area has started to promote and apply hydraulic reversing plough.It is carried out ploughing ashamed industry with pivot plow, be had Whether there is or not opening and closing ridge, production efficiency is high, energy saving the advantages that.Hydraulic reversing plough is to control left and right two using the hydraulic system of tractor Plough body alternately operating is covered, to achieve the purpose that without opening and closing ridge.As shown in fig. 6, the switching mechanism of hydraulic reversing plough includes mainly outstanding Hanger 101, rotation axis 105, plow beam 102 and oil cylinder 103, rotation axis 105 are welded on hanger bracket 101, and plow beam 102, which is mounted on, to be turned On moving axis 105,103 both ends of oil cylinder are hinged on axis pin on hanger bracket top and plow beam 102 respectively, and plough body 104 is mounted in plow beam 102 On.Oil cylinder is by the HYDRAULIC CONTROL SYSTEM of tractor, and when ploughing in running order, oil cylinder is in maximum elongation state.It is overturning When commutation, needs first control cylinder to shorten and plow beam is driven to be flipped up, when plow beam is approximately rotated to upright position, then control oil Cylinder stretches out, and plow beam is made to cross " dead point " position, cylinder thrust and and gravity under the action of continue to rotate, until the other side works Stop when position.
Currently, for the overturning control valve of control cylinder, there are mainly two types of forms both at home and abroad, one is the overturnings of manual hydraulic pressure Control valve, another kind are automatic turning control valves.Manual mode is that manual guiding valve control cylinder is directly manipulated by operator on the tractor Oil circuit makes alternating plough starting overturning, and plough stirs shift fork in middle position and drives a rotary valve that oil path in oil cylinder is made to convert, and completes to turn over Convert to, this overturning control valve operator on the tractor in headland turn will also grasp in addition to manipulation direction disk, lifting plough Vertical overturning control valve, it is very nervous and busy for completing these types action in very short time, and labor intensity increases;It needs simultaneously It is also high that complexity, cost are not only constructed using two control valves.Automatic turning control valve is to utilize two rotary valves of a set of mechanism controls, So that the first rotary valve is manipulated oil path in oil cylinder makes plough starting overturning, the second rotary valve control the conversion of oil path in oil cylinder in switching process and realize The overturning of plough commutates.Although this switching mechanism realizes full-automatic inverting commutation.But structure is sufficiently complex, poor reliability, But also it need to be still very high with two control rotary valve costs.
Invention content
A kind of simple in structure, manufacture is provided the technical problem to be solved by the present invention is to present situation for the above-mentioned prior art It is at low cost, the cartridge valve of pivot plow automatic turning control may be implemented.
Technical solution is used by the present invention solves above-mentioned technical problem:A kind of cartridge valve, it is characterised in that:Valve Set, valve pocket be equipped with oil inlet, oil return opening, the first actuator port and the second actuator port, valve pocket be equipped with first passage, first There is the first through-flow slot, the second through-flow slot, third is through-flow slot and four-way chute, the first through-flow slot and second of annular on channel Actuator port is connected, and the second through-flow slot is connected with oil inlet, and third is through-flow, and slot is connected with the first actuator port, four-way Chute is connected with oil return opening;Reversing valve core is set to first passage and can slide, and reversing valve core is equipped with the first convex shoulder, second Convex shoulder, third convex shoulder and the 4th convex shoulder, the first passage of reversing valve core one end constitute main control chamber, and the of the reversing valve core other end One channel constitutes secondary control chamber, and reversing valve core is internally provided with the first flow of connection four-way chute and secondary control chamber, reversal valve Core inner be additionally provided with connection main control chamber and first flow the first damping hole, main control chamber also by be located on valve pocket second Damping hole is connected with the first actuator port, and the second channel of connection the second actuator port and main control chamber is additionally provided on valve pocket, First convex shoulder is equipped with the first through flow hole communicated with first flow, and secondary control intracavitary, which is equipped with, makes reversing valve core holding move to left trend The first spring;Overflow valve opens second channel, the first port of overflow valve and the second work on second channel for normal off Hydraulic fluid port is connected, and the second port of overflow valve is connected with main control chamber, after the second actuator port pressure reaches certain value, overflows It flows valve to open, fluid flows into main control chamber by the second actuator port.
Preferably, when reversing valve core is in left position, the first through-flow slot is connected with the second through-flow slot, and third Through-flow slot is connected with four-way chute;When reversing valve core is in right end position, the first through-flow slot is connected with the first through flow hole It is logical, and the second through-flow slot is connected with the through-flow slot of third.
Preferably, first passage is the left end opening closed structure of right end, screw plug is threaded with to close on valve pocket First passage left end is open, and main control chamber is formed between screw plug and reversing valve core.
Preferably, above-mentioned overflow valve includes poppet valve core, sliding sleeve, second spring and swivel nut, swivel nut is fixedly connected on valve pocket On, second spring is located in the inner cavity of swivel nut, and sliding sleeve sliding is located in the endoporus of valve pocket, the step phase of right end and poppet valve core It supports, left end offsets with second spring, and poppet valve core keeps blocking the trend of valve port under the active force of second spring.
Compared with the prior art, the advantages of the present invention are as follows:
(1) present invention is plug-in structure design, and volume compact is simple in structure, and manufacturing cost is low.
(2) present invention is designed by principle, can be automatically performed control overturning cylinder and first be retracted and stretch out again, be consumed without driver Take energy, high degree of automation.
Description of the drawings
Fig. 1 is the sectional view of the embodiment of the present invention;
Fig. 2 is the A-A sectional views in Fig. 1;
Fig. 3 is schematic diagram of the reversing valve core of the embodiment of the present invention in right end position;
Fig. 4 is the hydraulic schematic diagram of the embodiment of the present invention;
Fig. 5 is the embodiment of the present invention using hydraulic schematic diagram;
Fig. 6 is hydraulic reversing plough structural scheme of mechanism.
Specific implementation mode
Below in conjunction with attached drawing embodiment, present invention is further described in detail.
As shown in Figures 1 to 3, it is a preferred embodiment of the present invention.
A kind of cartridge valve, including:
Valve pocket 3, valve pocket 3 is equipped with oil inlet P, oil return inlet T, the first actuator port A and the second actuator port B, on valve pocket 3 There is the first through-flow slot 301, the second through-flow slot 302, third is through-flow slot of annular equipped with first passage L1, on first passage L1 303 and four-way chute 304, the first through-flow slot 301 be connected with the second actuator port B, the second through-flow slot 302 and oil inlet P It is connected, third is through-flow, and slot 303 is connected with the first actuator port A, and four-way chute 304 is connected with oil return inlet T;
Reversing valve core 2 is set to first passage L1 and can slide, and reversing valve core 2 is equipped with the first convex shoulder 2a, the second convex shoulder The first passage of 2b, third convex shoulder 2c and the 4th convex shoulder 2d, 2 one end of reversing valve core constitute main control chamber 3a, and reversing valve core 2 is another The first passage at end constitutes secondary control chamber 3b, and reversing valve core 2 is internally provided with the of connection four-way chute 304 and secondary control chamber 3b One runner 22 is additionally provided with the first damping hole 21 of connection main control chamber 3a and first flow 22, main control chamber inside reversing valve core 2 3a is also connected by the second damping hole 32 being located on valve pocket 3 with the first actuator port A, and connection second is additionally provided on valve pocket 3 The second channel L2 of actuator port B and main control chamber 3a, it is through-flow that the first convex shoulder 2a is equipped with first communicated with first flow 22 Hole 24, secondary control chamber 3b is interior to be equipped with the first spring 4 for making reversing valve core 2 keep moving to left trend;First passage L1 is open for left end Right end closed structure is threaded with screw plug 5 on valve pocket 3 to close first passage L1 left ends opening, screw plug 5 and reversing valve core Main control chamber 3a is formed between 2.When reversing valve core 2 is in left position, the first through-flow slot 301 and 302 phase of the second through-flow slot Connection, and the through-flow slot of third 303 is connected with four-way chute 304;When reversing valve core 2 is in right end position, first is through-flow Slot 301 is connected with the first through flow hole 24, and the through-flow slot of the second through-flow slot 302 and third 303 is connected.
Overflow valve 1 opens second channel L2, the first port of overflow valve 1 and second on second channel L2 for normal off Actuator port B is connected, and the second port of overflow valve 1 is connected with main control chamber 3a, when the second actuator port B pressure reaches one After definite value, overflow valve 1 is opened, and fluid flows into main control chamber 3a by the second actuator port B.Overflow valve 1 includes poppet valve core 11, sliding sleeve 12, second spring 13 and swivel nut 14, swivel nut 14 are fixedly connected on valve pocket 3, and second spring 13 is located in the inner cavity of swivel nut 14, sliding 12 sliding of set is located in the endoporus of valve pocket 3, and the step of right end and poppet valve core 11 offsets, and left end offsets with second spring 13, Poppet valve core 11 keeps blocking the trend of valve port 1a under the active force of second spring 13.
The operation principle and process of this cartridge valve is as follows:
In application, as shown in Figure 5 (in figure actually connect in hydraulic lock have been left out), by the present invention 9 oil inlet P and Oil return inlet T is connected with the actuator port A1 of the solenoid directional control valve 7 for controlling fuel feeding with B1 respectively, the first working oil of the invention The rodless cavity of mouth A connections overturning cylinder 8, the second actuator port B connections overturn the rod chamber of cylinder 8.
When pivot plow is in running order, need not be overturn, solenoid directional control valve 7 is in power failure state, oily at this time Mouth A1, B1 are communicated with oil return inlet T 1, then the hydraulic fluid port P and hydraulic fluid port T of the present invention 9 is also at passive state, in the effect of the first spring 4 Under power, reversing valve core 3 is in position as shown in Figure 1, and the first through-flow slot 301 is connected with the second through-flow slot 302, and third is through-flow Slot 303 is connected with four-way chute 304.
When needing control pivot plow to be overturn, solenoid directional control valve 7 is made to charge, then oil inlet P of the invention and hydraulic pressure 6 outlet of pump is connected, and hydraulic fluid port T is connected with fuel tank, as shown in Figure 1, when oil inlet P oil inlet, main control chamber 3a and secondary control chamber 3b is connected by first flow 22 with oil return inlet T, therefore pressure is equal in main control chamber 3a and secondary control chamber 3b, first Under the active force of spring 4, reversing valve core 3 keeps position as shown in Figure 1.The fluid that hydraulic pump 6 exports passes through electromagnetic switch Enter oil inlet P after valve 7, then enters after the second through-flow slot 302, the first through-flow slot 301, the second actuator port B turn over successively Turn the rod chamber of cylinder 8, push overturning cylinder 8 to retract and plow beam is driven to be flipped up, and overturns the fluid of 8 rodless cavity of cylinder successively through first Fuel tank is returned to after actuator port A, third are through-flow slot 303, four-way chute 304, oil return inlet T.
When overturn cylinder 8 to retract to the end after, that is, drive plow beam reach " dead-centre position " when, the second actuator port B's Pressure rises rapidly, and when pressure rises to the setting pressure of overflow valve 1, poppet valve core 11 is opened, the fluid of the second actuator port B Enter main control chamber 3a through valve port 1a, pushes reversing valve core 2 to move right, be finally displaced into right end position as shown in Figure 3, this When oil inlet P is communicated with the first actuator port A, the second actuator port B passes through the first through flow hole 24, first flow 22 and oil return opening T-phase is logical, while overflow valve 1 is closed, and the fluid of the first actuator port A makes reversal valve through the second damping hole 32 into main control chamber 3a Core 2 keeps being in right end position, and overturning cylinder 8 starts to drive plow beam to downwardly turn over to stretching.
After overturning the stretching of cylinder 8 in place, the pressure of the first actuator port A rises, and reversing valve core 2 is made to be continually maintained in Fig. 3 Shown position.At this point, making 7 dead electricity of solenoid directional control valve, the pressure of oil inlet P disappears, effect of the reversing valve core 2 in the first spring 4 Under return to position shown in Fig. 1, in next step overturning control prepare.Therefore, driver only needs to control automatically controlled button It completes to control the automatic turning of pivot plow, human intervention is not necessarily in the transfer process turned under pivot plow is translated into from above.

Claims (4)

1. a kind of cartridge valve, it is characterised in that:Including
Valve pocket (3), valve pocket (3) are equipped with oil inlet (P), oil return opening (T), the first actuator port (A) and the second actuator port (B), valve pocket (3) is equipped with first passage (L1), and there is the first through-flow slot (301) of annular, second to lead on first passage (L1) Chute (302), third is through-flow slot (303) and four-way chute (304), the first through-flow slot (301) and the second actuator port (B) phase Connection, the second through-flow slot (302) are connected with oil inlet (P), and third is through-flow, and slot (303) is connected with the first actuator port (A), Four-way chute (304) is connected with oil return opening (T);
Reversing valve core (2), being set to first passage (L1) and can slide, and reversing valve core (2) is equipped with the first convex shoulder (2a), second convex The first passage of shoulder (2b), third convex shoulder (2c) and the 4th convex shoulder (2d), reversing valve core (2) one end constitutes main control chamber (3a), The first passage of reversing valve core (2) other end constitutes secondary control chamber (3b), and reversing valve core (2) is internally provided with connection four-way chute (304) and the first flow of secondary control chamber (3b) (22), internal is additionally provided with of reversing valve core (2) are connected to main control chamber (3a) and first The first damping hole (21) of runner (22), main control chamber (3a) also pass through the second damping hole (32) for being located on valve pocket (3) and the One actuator port (A) is connected, and second that the second actuator port of connection (B) and main control chamber (3a) are additionally provided on valve pocket (3) is logical Road (L2), the first convex shoulder (2a) are equipped with the first through flow hole (24) communicated with first flow (22), are set in secondary control chamber (3b) There is the first spring (4) for making reversing valve core (2) keep moving to left trend;
Overflow valve (1) is set on second channel (L2) and opens second channel (L2) for normal off, the first port of overflow valve (1) and Second actuator port (B) is connected, and the second port of overflow valve (1) is connected with main control chamber (3a), when the second actuator port (B) after pressure reaches certain value, overflow valve (1) is opened, and fluid flows into main control chamber (3a) by the second actuator port (B).
2. a kind of cartridge valve according to claim 1, it is characterised in that:When reversing valve core (2) is in left position When, the first through-flow slot (301) is connected with the second through-flow slot (302), and the through-flow slot of third (303) and four-way chute (304) It is connected;When reversing valve core (2) is in right end position, the first through-flow slot (301) is connected with the first through flow hole (24), and the Two-way chute (302) is connected with the through-flow slot of third (303).
3. a kind of cartridge valve according to claim 1, it is characterised in that:The first passage (L1) is open for left end The closed structure of right end, is threaded with screw plug (5) on valve pocket (3) to close first passage (L1) left end opening, screw plug (5) and Main control chamber (3a) is formed between reversing valve core (2).
4. a kind of cartridge valve according to claim 1, it is characterised in that:The overflow valve (1) includes poppet valve core (11), sliding sleeve (12), second spring (13) and swivel nut (14), swivel nut (14) are fixedly connected on valve pocket (3), second spring (13) It is located in the inner cavity of swivel nut (14), sliding sleeve (12) sliding is located in the endoporus of valve pocket (3), the step of right end and poppet valve core (11) It offsets, left end offsets with second spring (13), and poppet valve core (11) keeps blocking valve under the active force of second spring (13) The trend of mouth (1a).
CN201810485265.3A 2018-05-18 2018-05-18 Plug-in type valve Active CN108626193B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810485265.3A CN108626193B (en) 2018-05-18 2018-05-18 Plug-in type valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810485265.3A CN108626193B (en) 2018-05-18 2018-05-18 Plug-in type valve

Publications (2)

Publication Number Publication Date
CN108626193A true CN108626193A (en) 2018-10-09
CN108626193B CN108626193B (en) 2020-08-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810485265.3A Active CN108626193B (en) 2018-05-18 2018-05-18 Plug-in type valve

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502518A1 (en) * 1985-01-25 1986-07-31 Mannesmann Rexroth GmbH, 8770 Lohr Directly controlled pressure-relief valve
CN101629587A (en) * 2009-08-06 2010-01-20 宁波汉商液压有限公司 Hydraulic balance valve
CN101929481A (en) * 2010-04-30 2010-12-29 北京联合大学 Three-way pressure compensating valve for hydraulic energy-saving system
CN101943186A (en) * 2009-09-21 2011-01-12 邵阳维克液压股份有限公司 Hydraulic control valve group
CN103062147A (en) * 2013-01-24 2013-04-24 中联重科股份有限公司 Hydraulic-control throttling valve, balance valve, engineering machine and hydraulic system for controlling winch
CN103470565A (en) * 2013-09-24 2013-12-25 徐州重型机械有限公司 Rotary cushion valve and rotary system for crane
CN203532381U (en) * 2013-09-24 2014-04-09 徐州重型机械有限公司 Rotary cushion valve and rotary system of crane
CN203641146U (en) * 2013-12-09 2014-06-11 怀特(中国)驱动产品有限公司 Direct-acting hydraulic threaded cartridge buffering overflow valve
CN203743110U (en) * 2014-03-10 2014-07-30 杭州前进齿轮箱集团股份有限公司 Electric control inching valve
CN104019073A (en) * 2014-06-11 2014-09-03 徐州重型机械有限公司 Pressure control valve set, hydraulic system and engineering mechanical equipment

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502518A1 (en) * 1985-01-25 1986-07-31 Mannesmann Rexroth GmbH, 8770 Lohr Directly controlled pressure-relief valve
CN101629587A (en) * 2009-08-06 2010-01-20 宁波汉商液压有限公司 Hydraulic balance valve
CN101943186A (en) * 2009-09-21 2011-01-12 邵阳维克液压股份有限公司 Hydraulic control valve group
CN101929481A (en) * 2010-04-30 2010-12-29 北京联合大学 Three-way pressure compensating valve for hydraulic energy-saving system
CN103062147A (en) * 2013-01-24 2013-04-24 中联重科股份有限公司 Hydraulic-control throttling valve, balance valve, engineering machine and hydraulic system for controlling winch
CN103470565A (en) * 2013-09-24 2013-12-25 徐州重型机械有限公司 Rotary cushion valve and rotary system for crane
CN203532381U (en) * 2013-09-24 2014-04-09 徐州重型机械有限公司 Rotary cushion valve and rotary system of crane
CN203641146U (en) * 2013-12-09 2014-06-11 怀特(中国)驱动产品有限公司 Direct-acting hydraulic threaded cartridge buffering overflow valve
CN203743110U (en) * 2014-03-10 2014-07-30 杭州前进齿轮箱集团股份有限公司 Electric control inching valve
CN104019073A (en) * 2014-06-11 2014-09-03 徐州重型机械有限公司 Pressure control valve set, hydraulic system and engineering mechanical equipment

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Effective date of registration: 20200710

Address after: No.8 Shangni Industrial Zone, Luoyang street, Luqiao District, Taizhou City, Zhejiang Province

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Address before: 315000 188 Jinghua Road, Ningbo high tech Zone, Zhejiang (1493 tower, 041 block B block, modern building, Ningbo harbour).

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