CN104806595B - Direct-acting type load control valve used for integrating overflowing function into main valve core - Google Patents
Direct-acting type load control valve used for integrating overflowing function into main valve core Download PDFInfo
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- CN104806595B CN104806595B CN201510207823.6A CN201510207823A CN104806595B CN 104806595 B CN104806595 B CN 104806595B CN 201510207823 A CN201510207823 A CN 201510207823A CN 104806595 B CN104806595 B CN 104806595B
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- valve
- control
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- hand member
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
Abstract
The invention discloses a direct-acting type load control valve used for integrating an overflowing function into a main valve core. The valve comprises a spiral block, a control piston, a push rod, a valve sleeve spring, the main valve core, a valve sleeve, a control valve left end cover, a control valve spring, a control valve core, a control valve body, a control valve push rod, a control valve push rod spring, a valve body, an overflowing ball valve core, an overflowing piston, a main valve spring, a main valve spring sleeve and a pretightening force adjusting bolt. According to the invention, a control oil circuit is simplified and is integrated into a pilot control module, so that the processing technological requirement of the control oil circuit is reduced; the control oil circuit is improved from the principle, so that the pilot ratio is improved, and the control pressure required when a load is released is reduced; the overflowing function which is completed by a single valve core is integrated into the main valve core to reduce the number of valve parts, the size of the valve body is smaller, and the structure is more compact.
Description
Technical field
The present invention relates to hydraulic control component, especially relate to a kind of Direct Action Type that relief function is integrated in main valve plug and bear
Carry control valve.
Background technology
Load control valve is balanced valve is a kind of hydraulic pressure being specially designed for controlling in loading condition dirty oil return source
The hydraulic valve of oily flow.Load or title Exceed load, refer to load force direction and load movement direction identical situation,
Often occur in engineering hydraulic pressure and vibration hydraulic system.In addition this kind of hydraulic valve generally also needs to the function with overflow, with
Ensure that hydraulic actuator is not damaged by high pressure.
In the case of Exceed load, the flow of load control valve needs to control by load control valve oil circuit control, in application
When high-pressure system, in order that motion is as far as possible steadily, it usually needs complicated controlling network is to reduce or eliminate what vibration brought
Impact；In addition, traditional Direct Action Type load control valve generally arranges single overflow valve to realize relief function.These settings all account for
According to limited valve space, and increased difficulty of processing.
In order to realize power conservation requirement in high voltage control, needing to try one's best increases pilot ratio to reduce the same load pressure institute of control
The pilot pressure needing, the pilot pressure that therefore above-mentioned 2 points of losses causing valve inner space also result in needs increases.
In view of this, application new principle, new method, carry out principle and letter functionally to the oil circuit control of load control valve
Change, the Direct Action Type load control valve propose a kind of big pilot ratio, relief function being integrated on main valve plug has important engineering
Meaning.
Content of the invention
In order to overcome that the part being present in background technology in traditional Direct Action Type load control valve is many, complex structure, control
The high deficiency of pressure requirements, it is an object of the invention to provide a kind of Direct Action Type load control that relief function is integrated in main valve plug
Valve processed, simplify control network, Direct Action Type load control non-return valve function being integrated in valve pocket, relief function being integrated in main valve plug
Valve processed, this valve has carried out the improvement in structure and principle to controlling network in conventional load control valve, improves pilot ratio, will be by
The relief function that one single valve element completes is integrated in minimizing valve number of components on main valve plug, so that valve body is amassed less, structure is tighter
Gather.
The technical solution used in the present invention is:
The present invention includes spiral shell resistance, controls piston, push rod, valve pocket spring, main valve plug, valve pocket, control valve left end cap, control valve
Spring, controls valve element, application valve body, controls valve follower, control valve push rod spring, valve body, overflow ball valve core, overflow piston, master
Valve spring, main spool spring set and pretightning force regulating bolt；
Application valve body is placed in valve body top, is connected with valve body by screw thread, and its left end screw thread forms adjustable damping with valve body；
Control valve left end cap is installed on application valve body left end screw thread in the hole；Control valve spring one end withstands on control valve left end cap right-hand member shoulder
On, the other end withstands on control valve element left end shoulder, is pressed in application valve body inner cylinder aperture right-hand member by controlling valve element；Control
Valve follower spring is located at the first control intracavity, and control valve push rod spring left end withstands on the cylindrical hole bottom of application valve body right-hand member, control
Valve follower spring right-hand member processed withstands on the shoulder controlling valve follower left end；Valve follower small end is controlled to pass through application valve body internal little
Hole, its big end is formed with application valve body right-hand member cylindrical hole and is slidably matched；Sealing bolt is located at application valve body right-hand member, with application valve body
It is threaded connection；The upper end of valve body is provided with control mouth s mouth, and control mouth s mouth is connected with the first control chamber；
Control piston to be located at valve body left end cylinder in the hole, control the piston face of cylinder and valve body left end cylindrical hole to form slip and join
Close, spiral shell resistance is connected with valve body by valve body left end screwed hole, control piston left side to contact the push rod face of cylinder with spiral shell resistance right side
Constitute with valve body medial small hole and be slidably matched, push rod left end withstands on control piston right side, and it is left that push rod right-hand member withstands on main valve plug
In the cylinder groove bottom of end；
Valve pocket is located at valve body right-hand member cylinder in the hole, and valve pocket is slidably matched with valve body right-hand member cylindrical hole composition；Main valve plug is located at
Valve body right-hand member cylinder in the hole, on the left of it, the small end face of cylinder is constituted with valve pocket and is slidably matched, the big end face of cylinder and master on the right side of main valve plug
Valve spring set cylindrical hole composition is slidably matched；Valve body lower end is provided with load port v mouth, and load port v mouth is connected with load cavity；Valve pocket bullet
Spring is located at load intracavity, and valve pocket spring left end withstands on valve body right-hand member cylindrical hole bottom, and it is recessed that valve pocket spring right-hand member withstands on valve pocket left end
On groove；
Overflow piston is located at main spool spring and covers left end cylinder in the hole, and the big end of overflow piston is constituted with main spool spring set cylindrical hole
It is slidably matched, overflow piston big end left side withstands on main valve plug right side, overflow piston left end sphere withstands on main valve plug right-hand member
On groove shoulder；Valve body lower end is provided with oil return opening f mouth, and oil return opening f mouth connects oil back chamber；
Main spool spring is located at the first draining intracavity, and its left end withstands on overflow piston right-hand member shoulder, and its right-hand member withstands on pretension
On power regulating bolt left end shoulder；Pretightning force regulating bolt is threaded connection with main spool spring set right-hand member screwed hole.
Described application valve body inner aperture with control valve element right-hand member sphere, control valve follower left end and valve body to be collectively forming the
One control chamber.
Described control piston cylinder groove right-hand member and spiral shell resistance right side, application valve body left side, control valve follower right side, close
Envelope bolt 14 left side and valve body are collectively forming the second control chamber；Control piston right side common with valve body left end cylindrical hole and push rod
With composition the second draining chamber；
Described main valve plug cylinder groove right-hand member and valve pocket left end, valve body right-hand member cylindrical hole and overflow piston left end sphere constitute negative
Carry chamber；The main valve plug conical surface collectively forms oil back chamber with the valve body right-hand member face of cylinder, overflow piston sphere and valve pocket right side.
Described overflow piston right side and the common structure in pretightning force regulating bolt left side and the main spool spring set left end face of cylinder
Become the first draining chamber.
Described control valve element, application valve body and the fluid-control one-way valve arrangement controlling valve follower composition；And application valve body is left
The adjustable damping structure of end screwed hole and valve body composition collectively constitutes oil circuit control.
The invention has the advantages that:
Minimizing valve number of components on main valve plug will be integrated in by the relief function that a single valve element completes, so that valve body is amassed more
Little, more compact structure；The positive non-return valve function of main valve is integrated on valve pocket, simplifies main valve structure, make check valve reversely close
Envelope is relatively reliable；Oil circuit control is simplified and is integrated in a control module, is saved valve space, reduce oil circuit control and add
The technological requirement of work.
Brief description
Fig. 1 is the principle schematic diagram. of the present invention.
Fig. 2 is the state diagram that when load rises, Direct Action Type load control valve is unidirectional when opening.
Fig. 3 is that when load declines, Direct Action Type load control valve controls state diagram when opening.
Fig. 4 is state diagram when Direct Action Type load control valve overflow is opened.
Fig. 5 is state diagram when Direct Action Type load control valve controls valve element reversely to open.
In figure: 1, spiral shell resistance, 2, control piston, 3, push rod, 4, valve pocket spring, 5, main valve plug, 6, valve pocket, 7, control valve left end
Lid, 8, control valve spring, 9, control valve element, 10, application valve body, 11, control valve follower, 12, control valve push rod spring, 13, valve
Body, 14, sealing bolt, 15, overflow piston, 16, main spool spring, 17, main spool spring set, 18, pretightning force regulating bolt, 19,
One draining chamber, the 20, first control chamber, 21, oil back chamber, 22, load cavity, the 23, second draining chamber, the 24, second control chamber.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 1, the present invention includes spiral shell resistance 1, control piston 2, push rod 3, valve pocket spring 4, main valve plug 5, valve pocket 6, control
Valve left end cap 7 processed, control valve spring 8, control valve element 9, application valve body 10, control valve follower 11, control valve push rod spring 12, valve
Body 13, sealing bolt 14, overflow piston 15, main spool spring 16, main spool spring set 17 and pretightning force regulating bolt 18.
Application valve body 10 is placed in valve body 13 top, is connected with valve body 13 by screw thread, and its left end screw thread and valve body 13 are formed
Adjustable damping；Control valve left end cap 7 is installed on application valve body 10 left end screw thread in the hole；Control valve spring 8 one end withstands on control valve
On left end cap 7 right-hand member shoulder, the other end withstands on control valve element 9 left end shoulder, is pressed in controlling valve element 9 in application valve body 10
Portion's cylinder aperture right-hand member；Control valve push rod spring 12 is located in the first control chamber 20, and control valve push rod spring 12 left end withstands on control
The cylindrical hole bottom of valve body 10 right-hand member processed, control valve push rod spring 12 right-hand member withstands on the shoulder controlling valve follower 11 left end；Control
Valve follower 11 small end processed passes through application valve body 10 inner aperture, and its big end and application valve body 10 right-hand member cylindrical hole form slip and join
Close；Sealing bolt 14 is located at application valve body 13 right-hand member, is threaded connection with application valve body 13；Application valve body 10 inner aperture with
Control valve element 9 right-hand member sphere, control valve follower 11 left end and valve body 13 to be collectively forming the first control chamber 20, the upper end of valve body 13 sets
There is control mouth s mouth, control mouth s mouth is connected with the first control chamber 20.
Control piston 2 to be located at valve body 13 left end cylinder in the hole, control piston 2 face of cylinder to be formed with valve body 13 left end cylindrical hole
It is slidably matched, spiral shell resistance 1 is connected with valve body 13 by valve body 13 left end screwed hole, control piston 2 left side and spiral shell to hinder 1 right side and connect
Touch；Piston 2 cylinder groove right-hand member and spiral shell is controlled to hinder 1 right side, application valve body 10 left side, control valve follower 11 right side, sealing
Bolt 14 left side and valve body 13 are collectively forming the second control chamber 24；Push rod 3 face of cylinder is constituted with valve body 13 medial small hole slides
Cooperation, push rod 3 left end withstands on control piston 2 right side, and push rod 3 right-hand member withstands in main valve plug 5 left end cylinder groove bottom；Control
Piston 2 right side collectively forms the second draining chamber 23 with valve body 13 left end cylindrical hole and push rod 3.
Valve pocket 6 is located at valve body 13 right-hand member cylinder in the hole, and valve pocket 6 is slidably matched with valve body 13 right-hand member cylindrical hole composition；Main valve
Core 5 is located at valve body 13 right-hand member cylinder in the hole, and on the left of it, the small end face of cylinder is constituted with valve pocket 6 and is slidably matched, and main valve plug 5 right side is big to hold
The face of cylinder is slidably matched with main spool spring set 17 cylindrical hole composition；Main valve plug 5 cylinder groove right-hand member is right with valve pocket 6 left end, valve body 13
End cylindrical hole and overflow piston 15 left end sphere constitute load cavity 22；Valve body 13 lower end is provided with load port v mouth, load port v mouth with
Load cavity 22 is connected；Valve pocket spring 4 is located in load cavity 22, and valve pocket spring 4 left end withstands on valve body 13 right-hand member cylindrical hole bottom, valve
Sleeve spring 4 right-hand member withstands on valve pocket 6 left end groove.
Overflow piston 15 is located at main spool spring and covers 17 left end cylinder in the holes, and overflow piston 15 is held greatly and main spool spring set 17 circle
Post holes composition is slidably matched, and overflow piston 15 holds greatly left side to withstand on main valve plug 5 right side；Overflow piston 15 left end sphere top
On main valve plug 5 right-hand member groove shoulder；Main valve plug 5 conical surface is right with the valve body 13 right-hand member face of cylinder, overflow piston 15 sphere and valve pocket 6
End face collectively forms oil back chamber 21；Valve body 13 lower end is provided with oil return opening f mouth, and oil return opening f mouth connects oil back chamber 21.
It is common that overflow piston 15 right side and pretightning force regulating bolt 18 left side and main spool spring cover the 17 left end faces of cylinder
Constitute the first draining chamber 19；Main spool spring 16 is located in the first draining chamber 19, and its left end withstands on overflow piston 15 right-hand member shoulder,
Its right-hand member withstands on pretightning force regulating bolt 18 left end shoulder；Pretightning force regulating bolt 18 covers 17 right-hand member screwed holes with main spool spring
It is threaded connection.
Described control valve element 9, application valve body 10 and the fluid-control one-way valve arrangement controlling valve follower 11 composition；And control valve
The adjustable damping structure of body 10 left end screwed hole and valve body 13 composition collectively constitutes oil circuit control.
The operation principle of the present invention is as follows:
As shown in Fig. 2 when rising for load, state when load control valve is opened as check valve, now hydraulic oil is from f
Mouth enters the oil back chamber 21 of Direct Action Type load control valve, promotes valve pocket 6 compression valve sleeve spring 4 to move right, valve port is opened, hydraulic pressure
Oil enters load cavity 22 through valve port, and then flows out from v mouth, now, main valve plug 5, control piston 2, push rod 3, control valve element 9 and control
Valve follower 11 processed is in motionless in situ.
As shown in figure 3, when declining for load, load control valve controls state when opening.When do not control oil from control
Mouthful s mouth enters fashionable, and hydraulic oil enters load cavity 22 through v mouth, acts on main valve plug 5 cylinder groove right-hand member, due to main spool spring 16
The effect of pretightning force, main valve will not be opened.When controlling oil to enter the first control chamber 20 through control mouth s mouth, push control valve open
Core 9 flows into the second control chamber 24, controls oil to act on control piston 2 cylinder groove right-hand member, under the promotion of push rod 3, promotes main valve
Core 5 is opened, and hydraulic oil restriction on main valve plug 5 flows into oil back chamber 21, flows out from oil return opening f mouth.Now control valve follower
11 be in situ motionless.
As shown in figure 4, situation when opening for Direct Action Type load control valve overflow, enter control mouth s when not controlling oil
Mouthful, and when the hydraulic fluid pressure that load port v mouth enters is too high, the hydraulic oil in load cavity 22 directly passes through inside main valve plug 5
Aperture acts on overflow piston 15, promotes overflow piston 15 compression main spool spring 16, so that overflow piston 15 is opened, hydraulic oil passes through
On main valve plug 5, perforate enters oil back chamber 21, flows out from oil return opening f mouth.Now control piston 2, push rod 3, main valve plug 5, control valve
Core 9 and control valve follower 11 are in motionless in situ.
As shown in figure 5, situation when reversely opening for Direct Action Type load control valve valve element, when control-oil pressure reduces, main
When valve element 5 moves right, control piston 2 to move right under the promotion of push rod 3, control oil to act on control valve follower 11 right-hand member
Face, compression control valve follower spring 12, and control valve element 9 to open by controlling valve follower 11 to promote, control oil to pass through ball valve control
Valve element 9 processed is back to the first control chamber 20, and is flowed out by control mouth s mouth.
Claims (6)
1. a kind of by relief function be integrated in main valve plug Direct Action Type load control valve it is characterised in that: include spiral shell resistance (1), control
Piston (2) processed, push rod (3), valve pocket spring (4), main valve plug (5), valve pocket (6), control valve left end cap (7), control valve spring
(8), control valve element (9), application valve body (10), control valve follower (11), control valve push rod spring (12), valve body (13), sealing
Bolt (14), overflow piston (15), main spool spring (16), main spool spring set (17) and pretightning force regulating bolt (18)；
Application valve body (10) is placed in valve body (13) top, is connected with valve body (13) by screw thread, its left end screw thread and valve body (13)
Form adjustable damping；Control valve left end cap (7) is installed on application valve body (10) left end screw thread in the hole；Control valve spring (8) one end
Withstand on control valve left end cap (7) right-hand member shoulder, the other end withstands on control valve element (9) left end shoulder, valve element (9) will be controlled to press
Tightly in application valve body (10) inner cylinder aperture right-hand member；Control valve push rod spring (12) is located in the first control chamber (20), controls
Valve follower spring (12) left end withstands on the cylindrical hole bottom of application valve body (10) right-hand member, and control valve push rod spring (12) right-hand member withstands on
Control on the shoulder of valve follower (11) left end；Valve follower (11) small end is controlled to pass through application valve body (10) inner aperture, its big end
Formed with application valve body (10) right-hand member cylindrical hole and be slidably matched；Sealing bolt (14) is located at valve body (13) right-hand member, with valve body (13)
It is threaded connection；The upper end of valve body (13) is provided with control mouth s mouth, and control mouth s mouth is connected with the first control chamber (20)；
Control piston (2) to be located at valve body (13) left end cylinder in the hole, control piston (2) face of cylinder and valve body (13) left end cylindrical hole
Formation is slidably matched, spiral shell resistance (1) be connected with valve body (13) by valve body (13) left end screwed hole, control piston (2) left side and
Spiral shell resistance (1) right side contact；Push rod (3) face of cylinder is slidably matched with valve body (13) medial small hole composition, and push rod (3) left end withstands on
Control on piston (2) right side, push rod (3) right-hand member withstands in main valve plug (5) left end cylinder groove bottom；Valve pocket (6) is located at valve body
(13) right-hand member cylinder in the hole, valve pocket (6) is slidably matched with valve body (13) right-hand member cylindrical hole composition；Main valve plug (5) is located at valve body
(13) right-hand member cylinder in the hole, on the left of it, the small end face of cylinder is constituted with valve pocket (6) and is slidably matched, big end cylinder on the right side of main valve plug (5)
Face is slidably matched with main spool spring set (17) cylindrical hole composition；Valve body (13) lower end is provided with load port v mouth, load port v mouth with negative
Carry chamber (22) to be connected；Valve pocket spring (4) is located in load cavity (22), and valve pocket spring (4) left end withstands on valve body (13) right-hand member cylinder
Bottom hole portion, valve pocket spring (4) right-hand member withstands on valve pocket (6) left end groove；
Overflow piston (15) is located at main spool spring set (17) left end cylinder in the hole, and overflow piston (15) is big to be held and main spool spring set
(17) cylindrical hole constitutes and is slidably matched, and overflow piston (15) is big to hold left side to withstand on main valve plug (5) right side, overflow piston
(15) left end sphere withstands on main valve plug (5) right-hand member groove shoulder；Valve body (13) lower end is provided with oil return opening f mouth, and oil return opening f mouth is even
Logical oil back chamber (21)；
Main spool spring (16) is located in the first draining chamber (19), and its left end withstands on overflow piston (15) right-hand member shoulder, its right-hand member
Withstand on pretightning force regulating bolt (18) left end shoulder；Pretightning force regulating bolt (18) and main spool spring set (17) right-hand member screwed hole
It is threaded connection.
2. a kind of Direct Action Type load control valve that relief function is integrated in main valve plug according to claim 1, its feature
It is: described application valve body (10) inner aperture and control valve element (9) right-hand member sphere, control valve follower (11) left end and valve body
(13) it is collectively forming the first control chamber (20).
3. a kind of Direct Action Type load control valve that relief function is integrated in main valve plug according to claim 1, its feature
It is: described control piston (2) cylinder groove right-hand member and spiral shell resistance (1) right side, application valve body (10) left side, control valve follower
(11) right side, sealing bolt (14) left side and valve body (13) are collectively forming the second control chamber (24)；Control piston (2) right-hand member
Face collectively forms the second draining chamber (23) with valve body (13) left end cylindrical hole and push rod (3).
4. a kind of Direct Action Type load control valve that relief function is integrated in main valve plug according to claim 1, its feature
It is: described main valve plug (5) cylinder groove right-hand member is left with valve pocket (6) left end, valve body (13) right-hand member cylindrical hole and overflow piston (15)
End sphere constitutes load cavity (22)；Main valve plug (5) conical surface and valve body (13) the right-hand member face of cylinder, overflow piston (15) sphere and valve pocket
(6) right side collectively forms oil back chamber (21).
5. a kind of Direct Action Type load control valve that relief function is integrated in main valve plug according to claim 1, its feature
It is: described overflow piston (15) right side and pretightning force regulating bolt (18) left side and main spool spring set (17) left end cylinder
Face collectively forms the first draining chamber (19).
6. a kind of Direct Action Type load control valve that relief function is integrated in main valve plug according to claim 1, its feature
It is: the fluid-control one-way valve arrangement that described control valve element (9), application valve body (10) and control valve follower (11) are constituted；And control
The adjustable damping structure that valve body (10) left end screwed hole processed and valve body (13) are constituted collectively constitutes oil circuit control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510207823.6A CN104806595B (en) | 2015-04-29 | 2015-04-29 | Direct-acting type load control valve used for integrating overflowing function into main valve core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510207823.6A CN104806595B (en) | 2015-04-29 | 2015-04-29 | Direct-acting type load control valve used for integrating overflowing function into main valve core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104806595A CN104806595A (en) | 2015-07-29 |
| CN104806595B true CN104806595B (en) | 2017-02-01 |
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ID=53691712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510207823.6A Active CN104806595B (en) | 2015-04-29 | 2015-04-29 | Direct-acting type load control valve used for integrating overflowing function into main valve core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104806595B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0042929A1 (en) * | 1980-06-30 | 1982-01-06 | Abex Corporation | Dual pilot counterbalance valve |
| CN101886641A (en) * | 2009-05-12 | 2010-11-17 | 上海立新液压有限公司 | Balanced valve |
| CN202746315U (en) * | 2012-08-23 | 2013-02-20 | 淮安市胜杰液压机械有限公司 | Reversing valve with direct-acting overflowing valve |
| CN204591850U (en) * | 2015-04-29 | 2015-08-26 | 浙江大学 | A kind of direct-acting type load control valve relief function being integrated in main valve plug |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07180781A (en) * | 1993-12-24 | 1995-07-18 | Tokimec Inc | Pilot operation type pressure control valve |
| JPH1038111A (en) * | 1996-07-23 | 1998-02-13 | Asahi Enterp:Kk | Relief valve |
-
2015
- 2015-04-29 CN CN201510207823.6A patent/CN104806595B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0042929A1 (en) * | 1980-06-30 | 1982-01-06 | Abex Corporation | Dual pilot counterbalance valve |
| CN101886641A (en) * | 2009-05-12 | 2010-11-17 | 上海立新液压有限公司 | Balanced valve |
| CN202746315U (en) * | 2012-08-23 | 2013-02-20 | 淮安市胜杰液压机械有限公司 | Reversing valve with direct-acting overflowing valve |
| CN204591850U (en) * | 2015-04-29 | 2015-08-26 | 浙江大学 | A kind of direct-acting type load control valve relief function being integrated in main valve plug |
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| Publication number | Publication date |
|---|---|
| CN104806595A (en) | 2015-07-29 |
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