CN1170067C - Hydraulic balancing valve - Google Patents
Hydraulic balancing valve Download PDFInfo
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- CN1170067C CN1170067C CNB01139093XA CN01139093A CN1170067C CN 1170067 C CN1170067 C CN 1170067C CN B01139093X A CNB01139093X A CN B01139093XA CN 01139093 A CN01139093 A CN 01139093A CN 1170067 C CN1170067 C CN 1170067C
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Abstract
The present invention relates to a hydraulically balanced valve which comprises a main valve, a pilot valve and a control valve, wherein each valve comprises a valve body, a valve core, a front cavity and a rear cavity. The valve core is connected with the valve body through a spring, the pilot valve is positioned in the main valve core, and the control valve is connected with the main valve up and down. The control valve also comprises two main oil ports A and B on the valve body and a control oil port X. A piston is positioned in the front cavity of the main valve, and a rod cavity and a rodless cavity are respectively communicated with the control oil port X through oil paths c and d on the valve body. The outer lateral surface of the rear end of the main valve core is axially provided with a plurality of chutes which are communicated with the oil port b of the main valve and the rear cavity of the main valve. The rear end of the main valve core is provided with an oil hole e which is communicated with the rear cavity of the main valve and the rear cavity of the pilot valve. The present invention has the advantages of simple preparing process, sensitive and stable movement, manual regulation of the main valve to maximum aperture width, wide range of application, less energy loss and high efficiency. Under the condition of damage of the soft tube and loss pressure, the stalled descent of load is prevented, and a hydraulic lock function is played.
Description
Technical field
The present invention relates to a kind of valve, relate in particular to and be used for 8 tons of hydraulic control equilibrium valves to 50 tons of various open system oil hydraulic circuits.
Background technique
Engineering machinery in the modern times, in the machinery such as building machinery, widely applied the hydraulic pressure load bearing system, wherein equilibrium valve is the crucial hydraulic element of this type systematic, the quality of its performance directly affects machine performance, and existing hydraulically balanced valve mainly is made of control valve and main valve, common have two kinds of single-stage and leading types, single-stage main valve and control valve are for to connect side by side, the leading type main valve is nested the connection with control valve, but above-mentioned two kinds of hydraulically balanced valves are that the hydraulic pressure load bearing system is when load is descending in the common shortcoming that exists on the performance, the valve core opening of equilibrium valve is difficult to be stabilized on the definite openings of sizes, make and load on the phenomenon that produces low-frequency jitter in the decline process, cause system extremely unstable, have a strong impact on the safety reliability of complete machine, for this reason, a kind of new equilibrium valve is devised, as Chinese patent ZL95236163.9 " combined type integrated package hydraulically balanced valve ", this patent increases by a maintaining valve above original main valve and control valve, be combined into a hydraulic manifold block, be total to same valve body, and in hydraulic manifold block, be provided with some damping holes dexterously, eliminated the low-frequency jitter in the decline weight process, strengthened Security, made action more reliable.But this patent exists above defective to be: (1) in the operating mode that weight rises, flow flows out through the restriction of maintaining valve through opening degree, the pipeline of main valve again, makes flow resistance increase in the weight uphill process, and energy loss is serious, and efficient is low; (2) damping hole all is to decide the hole, so flow can only change with pressure, reacts relatively slow; (3) adjusting that the maximum opening degree of main valve can not be artificial has influenced its using scope; (4) because this patent is designed to one, be difficult to processing, almost can't implement.
Summary of the invention
Technical problem to be solved by this invention is to overcome above-mentioned defective, and a kind of easy processing, highly sensitive, steady, the reliable hydraulically balanced valve of taking action are provided.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: hydraulically balanced valve comprises main valve, pilot valve and control valve, wherein each valve includes valve body, spool and two chambeies, front and back, spool all is connected with valve body by spring, pilot valve is positioned at main valve plug, control valve is connected up and down with main valve, be positioned at the first main hydraulic fluid port on the control valve valve body, second main hydraulic fluid port and the control port, second hydraulic fluid port that is positioned on the main valve communicates with the back cavity of control valve, the main valve plug ante-chamber communicates with the described first main hydraulic fluid port, be axially arranged with the 4th oilhole in the main valve plug front end and be communicated with the ante-chamber of pilot valve and the ante-chamber of main valve, it is characterized in that:
(1) the control valve ante-chamber and the first main hydraulic fluid port connect, and the back cavity of control valve connects with the second main hydraulic fluid port vertically;
(2) being positioned at the main valve ante-chamber has a control piston, its rod chamber and rodless cavity respectively by be positioned on the valve body first oilhole, second oilhole be connected with control port;
(3) main valve plug rear end outer side surface is axially arranged with second hydraulic fluid port of many skewed slots connection main valves and the back cavity of main valve;
(4) rear end of main valve plug is provided with the back cavity of one the 3rd oilhole connection main valve and the back cavity of pilot valve.
Can be provided with the circular arc throttling groove of many different amount, length on the described main valve plug front end outer side surface.
Be provided with in the described main valve plug front end with the 5th oilhole of the perpendicular perforation of the 4th oilhole and be communicated with the ante-chamber of main valve and the ante-chamber of pilot valve.
The described main valve plug front end outside can be provided with a main valve housing, is fixed with a valve pocket outside main valve housing again, and the rear end of valve pocket is provided with the spring housing that offsets with it and fix with main valve body, and main valve plug links to each other with spring housing by the main valve plug spring.
Described main valve plug rear end also can be provided with a spring seat, is axially arranged with above-mentioned the 3rd oilhole in the spring seat, and this spring seat one end and pilot valve spring offset, the offseting of the other end and main valve plug spring.
Described pilot valve is made up of steel ball seat, the steel ball that is positioned at steel ball seat and pilot valve spring, and steel ball seat links to each other with main valve plug by the pilot valve spring, and the inwall of steel ball and main valve plug matches and the front end of steel ball and the control piston bar of control piston face.
The rear end of described main valve plug can be provided with the adjustable lever relative with it, and this adjustable lever is fixed on the spring housing and protrudes from outside the main valve body, is positioned on the adjustable lever of spring housing to be with the main valve plug spring.
The side of described main valve body is provided with a valve plate that fixes with it, and second oilhole that communicates with control port communicates with the no bar oil pocket of control piston by first, second damping hole that is positioned at this valve plate.
In order to prevent that damping hole is blocked, also be provided with a filter core between first damping hole in above-mentioned second oilhole and valve plate.
For control piston returns fast, in described valve plate, also be provided with an one-way valve, one-way valve includes nonreturn valve core, spring and front/back cavity, nonreturn valve core is connected with valve plate by spring, the ante-chamber of one-way valve is connected with the rodless cavity of control piston by the 6th oilhole, and first damping hole in the back cavity of one-way valve and the valve plate communicates.
Compared with prior art, the invention has the advantages that: owing to adopt separation structure between main valve and control valve, the valve plate, so this valve easy processing; Moreover be provided with many skewed slots outside the main valve plug rear end, along with moving of main valve plug, the area of this place's restriction changes thereupon, thereby motion is sensitive more, steady; Also have owing to be provided with adjustable lever, so the maximum opening degree that this valve can the manual tune main valve makes it that wider application area be arranged at the front end of main valve; When weight rises, because flow only passes through control valve, flow to the second main hydraulic fluid port from the first main hydraulic fluid port, so whole process flow resistance is little, energy loss is little, the efficient height.
Description of drawings
Fig. 1 is that embodiment of the invention structure is cutd open and shown schematic representation;
Fig. 2 is that the right side of Fig. 1 is looked to cut open and shown schematic representation;
Fig. 3 is the main valve plug structural representation;
Fig. 4 is that schematic representation is looked on the right side of Fig. 3;
Fig. 5 is that present embodiment is applied in the hydraulic schematic diagram on the winch.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Referring to Fig. 1 and Fig. 2, hydraulically balanced valve comprises main valve, pilot valve, control valve, valve plate 8 and adjustable lever 1, and control valve is fixed by bolts to the top of main valve, and pilot valve is positioned at main valve, valve plate 8 is fixed by bolts to the right side of main valve, and adjustable lever 1 is positioned at the left side of main valve and faces with main valve plug 14.Wherein control valve comprises control valve body 5, control spool 7, two chambeies, front and back and lays respectively at the first main hydraulic fluid port A, the second main hydraulic fluid port B and the control port X of its valve body 5 fronts, top, side, control spool 7 is connected with control valve valve body 5 by control valve spring 6, and the chamber, front and back of control valve connects with the first main hydraulic fluid port A, the second main hydraulic fluid port B respectively;
Main valve includes main valve body 4, main valve plug 14, the first hydraulic fluid port a and the second hydraulic fluid port b of two chambeies, front and back and main valve body 4 upper ends, the first hydraulic fluid port a and the second hydraulic fluid port b are connected with the ante-chamber and the back cavity of control valve respectively, the first hydraulic fluid port a communicates with the ante-chamber of main valve again, main valve plug 14 rear end outer side surfaces are axially arranged with 2 skewed slots 23 and are communicated with the second hydraulic fluid port b of main valve and the back cavity of main valve, main valve plug 14 front end outer side surfaces are provided with 8 different amount, the circular arc throttling groove 24 of length (referring to Fig. 3 and Fig. 4), the main valve plug 14 front ends outside also is provided with main valve housing 10, outside main valve plug 14, also is furnished with valve pocket 15, the spring housing 2 that offsets and be threaded with valve pocket 15 with main valve body 4, card has a spring seat 16 on the rear end of main valve plug 14, be axially arranged with the 3rd oilhole e in the spring seat 16, an adjustable lever 1 and protruding from outside the valve body of main valve 4 has been threaded in the left side of spring housing 2, be positioned on the adjustable lever 1 of spring housing 2 and be with main spool spring 3, make main spool spring 3 between spring housing 2 and spring seat 16, on the front end of main valve plug 14 is axial, be provided with the 4th oilhole f, on the Vertical direction of this oilhole f, be provided with one the 5th oilhole g;
In main valve plug 14, be provided with a pilot valve, pilot valve is made up of steel ball seat 12 and the steel ball 11 and the guide's spring 13 that are positioned at steel ball seat 12 again, one end of guide's spring 13 is positioned on the spring seat 16, the other end and steel ball seat 12 offset, steel ball 11 matches with the inwall of main valve plug 14, above-mentioned the 3rd oilhole e is communicated with the back cavity of main valve plug 14 and the back cavity of pilot valve, and above-mentioned the 4th oilhole f and the 5th oilhole g are communicated with the ante-chamber of main valve and the ante-chamber of pilot valve;
Be provided with a control piston 9 in the ante-chamber of main valve, the control piston bar offsets by the 4th oilhole f of main valve plug 14 front ends and the steel ball 11 in the pilot valve, the rod chamber on the control piston 9 by be positioned on the valve body the first oilhole c be connected with control port X;
Also be provided with a valve plate 8 with its bolt on the right side of main valve body 4, be provided with first damping hole 18 and second damping hole 19 in the valve plate 8, rodless cavity on the control piston 9 is connected with control port X by the second oilhole d on above-mentioned first damping hole 18, second damping hole 19 and the main valve body 4, the second oilhole d connects with the first oilhole c and then communicates with control port X in the present embodiment, blocked in order to prevent oilhole, 18 of first damping holes in the second oilhole d and valve plate 8 are provided with a filter core 17; In described valve plate 8, also be provided with an one-way valve 20, one-way valve 20 includes nonreturn valve core 22, spring 21 and front/back cavity, nonreturn valve core 22 is connected with valve plate 8 by spring 21, the ante-chamber of one-way valve is connected with the rodless cavity of control piston 9 by the 6th oilhole h, and first damping hole 18 in one-way valve back cavity and the valve plate 8 communicates.
Fig. 5 is that the present invention is applied in the hydraulic schematic diagram on the winch, and the second main flow mouth B of this valve can be directly installed on the B of oil hydraulic motor M
1On the mouth, the first main hydraulic fluid port A of this valve is connected with the hydraulic fluid port A1 of high pressure hose with the control valve H of 3-position 4-way, control port X respectively with the B of oil hydraulic motor M
2Mouth, the rod chamber of this valve inner control piston 9 and the control valve H hydraulic fluid port B3 of rodless cavity and 3-position 4-way link to each other, and other two hydraulic fluid port P and the O of control valve H connect pressure oil-source and oil sump tank respectively.
The work control procedure of this valve is as follows: (1) when normally hoisting load G operating mode, 3-position 4-way control valve H gets to the position on the left side, and at this moment, pressure oil-source communicates with the first main hydraulic fluid port A by the hydraulic fluid port A1 of control valve H, and the B of oil hydraulic motor M
2Mouth and control port X communicate with oil sump tank by hydraulic fluid port B3, pressure oil enters from the first main hydraulic fluid port A, overcome the pretightening force of control valve inner control valve spring 6, the control spool 7 that promotes in the control valve moves to left, pressure oil is through the gap of control spool 7 with control valve body 5, flow into oil hydraulic motor M from the second main hydraulic fluid port B, drive hydraulic wireline winch J and promote load G, fluid is through the hydraulic fluid port B of oil hydraulic motor M
2Flow to control valve H, get back to oil sump tank, this is the operating mode that hoists normally.When (2) allowing load G be still in midair, H gets to the neutral position with the 3-position 4-way control valve, cut-out pressure oil enters the path of this valve first main hydraulic fluid port A, stop fuel feeding to oil hydraulic motor M, under load G deadweight effect, produce negative moment, try hard to make oil hydraulic motor M counter-rotating, even load G transfers the direction rotation, on the control valve inner control spool 7 tight obedient control valve bodies 5, block the passage between the first main hydraulic fluid port A and the second main hydraulic fluid port B at this moment, cut off the reverse oil stream that oil hydraulic motor M is produced by the negative moment effect, stop oil hydraulic motor M counter-rotating, stop load G to descend voluntarily, load G just rests in the air.(3) when load G transfers, with 3-position 4-way control valve H get to the right the position, the hydraulic fluid port B of pressure oil-source and control port X and oil hydraulic motor M
2Communicate, and the first main hydraulic fluid port A of this valve is connected with oil sump tank, the pressure of control port X is passed to the rod chamber of main valve body 4 inner control pistons 9 by the first oilhole c, the pressure of the X of control port simultaneously enters in the rodless cavity of main valve body 4 inner control pistons 9 by the second oilhole d, filter core 17, first damping hole 18 and second damping hole 19, utilize area difference on the control piston 9 to overcome the pretightening force of pilot valve inner spring 13, control piston 9 mastheads are driven steel ball 11, make between steel ball 11 and main valve plug 14 inwalls and produce the gap, at this moment oil hydraulic motor M hydraulic fluid port B
1On the fluid flow direction be: the back cavity → steel ball 11 of back cavity → the 3rd oilhole e → pilot valve of 2 skewed slot 23 → main valves of second hydraulic fluid port b → main valve plug, 14 rear ends and the 4th oilhole f of gap → main valve plug 14 front ends between main valve plug 14 inwalls on control valve body 5 second main hydraulic fluid port B → control valve back cavity → main valve bodies 4, ante-chamber → main valve first hydraulic fluid port a of the 5th oilhole g → main valve → main hydraulic fluid port A of control valve ante-chamber → first, flow back to oil sump tank through control valve H again, this moment is if the oil pressure at control port X place is less, then control piston 9 gap of pushing open between steel ball 11 back and main valve plug 14 inwalls is also less, so the sectional area of circulation is less, make oil hydraulic motor M counter-rotating lentamente, transfer load G at a slow speed, when the pilot pressure at control port X place continues to rise, act on thrust on the control piston 9 when surpassing the pretightening force of main valve plug spring 3 and spring internal pressure to the thrust sum of main valve plug 14, main valve plug 14 leaves the sealing surface of main valve housing 10, this moment, the oil flow direction of the second main hydraulic fluid port B was two approach: 1) back cavity → steel ball 9 of back cavity → the 3rd oilhole e → pilot valve of 2 skewed slot 23 → main valves of second hydraulic fluid port b → main valve plug, 14 rear ends on second main hydraulic fluid port B → control valve back cavity → main valve body 4 on the control valve body 5 and the 4th oilhole f of gap → main valve plug 14 front ends between main valve plug 14 inwalls, ante-chamber → main valve first hydraulic fluid port a of the 5th oilhole g → main valve → main hydraulic fluid port A of control valve ante-chamber → first flows back to oil sump tank through control valve H again.2) the main hydraulic fluid port A of first hydraulic fluid port a → control valve back cavity → first on 8 throttling groove 24 → main valve ante-chamber → main valve bodies 4 on second hydraulic fluid port b → main valve plug, the 14 front end outer side surfaces on second main hydraulic fluid port B → control valve back cavity → main valve body 4 on the control valve body 5, flow back to oil sump tank through control valve H again, this moment, oil hydraulic motor M improved reverse rotating speed, accelerated the lowering velocity of load G; (4) safety control process, too fast when oil hydraulic motor M rotating speed, when the oil suction flow occurred surpassing the oil drain quantity of oil pump, oil hydraulic motor M was the oil pump function, and pressure oil-source is to the hydraulic fluid port B of oil hydraulic motor M
2Between pipeline on occur to inhale empty trend, the pilot pressure at control port X place descends, the thrust that acts on the control piston 9 reduces, and main valve plug 14 moves to right, because 8 fuel-economizing grooves 24 have different angles and length, along with moving to right of main valve plug 14, its sectional area is tending towards reducing, and promptly orifice size reduces, and has increased the pressure that contends with to load, reduce the rotating speed of oil hydraulic motor M, load G speed limit is transferred.
When load G dropped to ground, H got to the neutral position with the 3-position 4-way control valve, and cut-out pressure oil enters the hydraulic fluid port B of oil hydraulic motor M
2Path with control port X, stop fuel feeding to oil hydraulic motor M, control port this moment X does not have pressure, spring in main valve and the pilot valve is because the restoring force effect, steel ball 11 is close to mutually with main valve plug 14 inwalls, the gap of main valve plug 14 and main valve housing 10 becomes and closes, and this moment, control piston 9 moved to right, and the oil in control piston 9 rodless cavities returns oil sump tank through the 6th oilhole h, one-way valve 20, first damping hole 18, filter core 17, the first oilhole c, control port X through control valve H.
This valve is except above-mentioned functions, also have when normally hoisting load behavior, because the first main hydraulic fluid port A often bears high pressure, high pressure hose is because of impacting or aging when damaged, and the control spool 7 in the control valve body 5 is because of the first main hydraulic fluid port A instantaneous loss of pressure, under the effect of the pressure of the second main hydraulic fluid port B, control spool 7 can be closed rapidly automatically, cut off the oil circuit of the main hydraulic fluid port A of the inner second main hydraulic fluid port B to the first of this valve, stop load G stall to descend, play the effect of hydraulic lock.Moreover, because the left side of main valve is provided with an adjustable lever 1, can regulate the maximum opening degree of main valve plug 14 artificially, promptly when hanging load is light, rotation adjustable lever 1, make the close together of 16 of adjustable lever 1 and spring seats, the orifice size that main valve plug 14 is opened is less, and the flow that flows through is enough to promote load; Otherwise, when hanging load is heavier, make the distance of 16 of adjustable lever 1 and spring seats far away, the orifice size that main valve plug 14 is opened is bigger, make the flow that flows through enough can promote load greatly, so both can reduce energy consumption, and the present invention both had been applied in the hydraulic circuit system of the hoisting of hydraulic mobile crane, luffing, extending means, the present invention is applied on freighter hydraulic cargo winch, hydraulic pressure deck crane fishing boat hydraulic pressure fishing machinery, the engineering ship hydraulic wireline winch, and application area is wider.
Protection scope of the present invention is not subjected to the restriction of the structure of the foregoing description; even the structure to embodiment is done some change; change 3 or 4 etc. into as main valve plug 14 rear end outer side surface axial chutes 23; pilot valve in the main valve plug 14 changes the conical surface into; the evolution of 1 of hydraulic fluid port evolution on the control valve or control valve, main valve, valve plate 8 and adjustable lever for another example, such scheme still belongs to protection scope of the present invention.
Claims (10)
1. hydraulically balanced valve, comprise main valve, pilot valve and control valve, wherein each valve includes valve body, spool and two chambeies, front and back, spool all is connected with valve body by spring, pilot valve is positioned at main valve plug (14), control valve is connected up and down with main valve, be positioned at the first main hydraulic fluid port (A) on the control valve valve body, the second main hydraulic fluid port (B) and control port (X), second hydraulic fluid port (b) that is positioned on the main valve communicates with the back cavity of control valve, main valve plug (14) ante-chamber communicates with the described first main hydraulic fluid port (A), be axially arranged with the 4th oilhole (f) in main valve plug (14) front end and be communicated with the ante-chamber of pilot valve and the ante-chamber of main valve, it is characterized in that:
(1), control valve ante-chamber and the first main hydraulic fluid port (A) connect, the back cavity of control valve connects with the second main hydraulic fluid port (B) vertically;
(2), be positioned at the main valve ante-chamber one control piston (9) arranged, its rod chamber and rodless cavity respectively by be positioned on the valve body first oilhole (c), second oilhole (d) be connected with control port (X);
(3), main valve plug (14) rear end outer side surface is axially arranged with second hydraulic fluid port (b) of many skewed slots (23) connection main valve and the back cavity of main valve;
(4), the rear end of main valve plug (14) is provided with the back cavity of one the 3rd oilhole (e) connection main valve and the back cavity of pilot valve.
2. hydraulically balanced valve according to claim 1 is characterized in that described main valve plug (14) front end outer side surface is provided with the circular arc throttling groove (24) of many different amount, length.
3. hydraulically balanced valve according to claim 1 is characterized in that being provided with in described main valve plug (14) front end with the 5th oilhole (g) of the perpendicular perforation of the 4th oilhole (f) and is communicated with the ante-chamber of main valve and the ante-chamber of pilot valve.
4. hydraulically balanced valve according to claim 1, it is characterized in that described main valve plug (14) the front end outside is provided with a main valve housing (10), outside main valve housing (10), be fixed with a valve pocket (15) again, the rear end of valve pocket (15) is provided with the spring housing (2) that offsets with it and fix with main valve body (4), and main valve plug (14) links to each other with spring housing (2) by main valve plug spring (3).
5. hydraulically balanced valve according to claim 1, it is characterized in that described main valve plug (14) rear end is provided with a spring seat (16), be axially arranged with above-mentioned the 3rd oilhole (e) in the spring seat (16), these spring seat (16) one ends and pilot valve spring (13) offset, the offseting of the other end and main valve plug spring (3).
6. hydraulically balanced valve according to claim 1, it is characterized in that described pilot valve is made up of steel ball seat (12), the steel ball (11) that is positioned at steel ball seat (12) and pilot valve spring (13), steel ball seat (12) links to each other with main valve plug (14) by pilot valve spring (13), and the inwall of steel ball (11) and main valve plug (14) matches and the front end of steel ball (11) faces with the piston rod that is positioned at the control piston (9) of above-mentioned the 4th oilhole (f).
7. hydraulically balanced valve according to claim 4, the rear end that it is characterized in that described main valve plug (14) is provided with the adjustable lever relative with it (1), this adjustable lever (1) is fixed on spring housing (2) and goes up and protrude from outside the main valve body (4), is positioned on the adjustable lever (1) of spring housing (2) to be with main valve plug spring (3).
8. according to the arbitrary described hydraulically balanced valve of claim 1 to 6, the side that it is characterized in that described main valve body (4) is provided with a valve plate (8) that fixes with it, and above-mentioned second oilhole (d) that communicates with control port (X) communicates with the no bar oil pocket of control piston (9) by first damping hole (18), second damping hole (19) that is positioned at this valve plate (8).
9. hydraulically balanced valve according to claim 8 is characterized in that also being provided with a filter core (17) between first damping hole (18) in described second oilhole (d) and the valve plate (8).
10. hydraulically balanced valve according to claim 8, it is characterized in that also being provided with in the described valve plate (8) one-way valve (20), one-way valve (20) includes nonreturn valve core (22), spring (21) and front/back cavity, nonreturn valve core (22) is connected with valve plate (8) by spring (21), the ante-chamber of one-way valve (20) is connected by the rodless cavity of the 6th oilhole (h) with control piston (9), and above-mentioned first damping hole (18) in the back cavity of one-way valve (20) and the valve plate (8) communicates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01139093XA CN1170067C (en) | 2001-12-07 | 2001-12-07 | Hydraulic balancing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01139093XA CN1170067C (en) | 2001-12-07 | 2001-12-07 | Hydraulic balancing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1350125A CN1350125A (en) | 2002-05-22 |
| CN1170067C true CN1170067C (en) | 2004-10-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01139093XA Expired - Fee Related CN1170067C (en) | 2001-12-07 | 2001-12-07 | Hydraulic balancing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1170067C (en) |
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| CN109488652B (en) * | 2018-12-21 | 2020-06-02 | 潍柴动力股份有限公司 | Case closed-loop control structure and hydraulic control valve |
| CN110671379A (en) * | 2019-08-23 | 2020-01-10 | 宁波江北宇洲液压设备厂 | Flow control type hoist balance valve |
| CN112112856B (en) * | 2020-10-13 | 2021-06-22 | 江苏科迈液压控制***有限公司 | One-way throttling balance valve |
-
2001
- 2001-12-07 CN CNB01139093XA patent/CN1170067C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1350125A (en) | 2002-05-22 |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20041006 Termination date: 20161207 |