CN101994727B - Balance valve having two-stage pressure buffering protection function - Google Patents

Balance valve having two-stage pressure buffering protection function Download PDF

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Publication number
CN101994727B
CN101994727B CN 201010610137 CN201010610137A CN101994727B CN 101994727 B CN101994727 B CN 101994727B CN 201010610137 CN201010610137 CN 201010610137 CN 201010610137 A CN201010610137 A CN 201010610137A CN 101994727 B CN101994727 B CN 101994727B
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China
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valve
hydraulic fluid
fluid port
oil
working connection
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Expired - Fee Related
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CN 201010610137
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CN101994727A (en
Inventor
任战平
石宇东
杨虎
刘世亮
徐世伟
史东明
孟庆莲
尹志红
王学敏
符磊
堵利宾
申丽
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Zhengzhou Yutong Heavy Industry Co Ltd
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Zhengzhou Yutong Heavy Industry Co Ltd
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Priority to CN 201010610137 priority Critical patent/CN101994727B/en
Publication of CN101994727A publication Critical patent/CN101994727A/en
Application granted granted Critical
Publication of CN101994727B publication Critical patent/CN101994727B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a balance valve having a two-stage pressure buffering protection function, which is characterized in that: the balance valve comprises a valve body, a first filter plug (1) arranged in the valve body, a first throttle valve (2), a shuttle valve (3), a sequence valve (4), a first check valve (5), a second throttle valve (6), a relief valve (7), a hydraulic control reversing valve (8), an overflow valve (9), a remote hydraulic control pressure comprehensive overflow valve (10), a third throttle valve (11), a second filter plug (12), a second check valve (13), a fourth throttle valve (14), a check balance valve (15), a third check valve (15-1) of the check balance valve (15), an externally controlled overflow valve (15-2) of the check balance valve (15), a first main oil path (V1-C1) which is arranged in the valve body and communicates the first oil opening (V1) and second oil opening (C1) of the valve body, a second main oil path(V2-C2) which communicates the third oil opening (V2) and fourth oil opening (C2), and related oil paths.

Description

A kind of equilibrium valve with secondary pressure buffer protection function
Technical field
The present invention relates to a hydraulic control valve, relate to a kind of equilibrium valve specifically with secondary pressure buffer protection function.
Background technique
In the large-scale engineering machinery hydraulic system, carry out the work requirements of original paper in order to satisfy high power hydraulic, generally adopt double pump (or many pumps) interflow technology power to be provided for actuator.Though in hydraulic system guide control system and working connection work system, taked much to be used to improve at present the measure of pressure, flow output stability; But receive the present stage technical limitations; Still there is the impact of bearing from hydraulic system in final actuator, actuator's proper functioning is constituted greatly threaten.
Summary of the invention
The object of the invention provides a kind of equilibrium valve with secondary pressure buffer protection function to existing deficiency in the above-mentioned existing technology just.This control valve has initial pressure protection restriction, then under the condition of meeting certain requirements---and promptly: after flow, pressure rise to specified value, again flow and pressure are promoted to system's maximum value automatically.
The object of the invention can be realized through following technique measures:
Equilibrium valve of the present invention comprises valve body; Be arranged on first filtering plug in the valve body; The first throttle valve; Shuttle valve; Sequence valve; First one-way valve; Second throttle valve; Reduction valve; Pilot operated directional control valve; Relief valve; Long-range fluid control pressure compensation relief valve; The 3rd throttle valve; Second filtering plug; Second one-way valve; The 4th throttle valve; The unidirectional equilibrium valve of forming by the 3rd one-way valve and external control relief valve; And be arranged on connection valve body first hydraulic fluid port and first working connection of second hydraulic fluid port in the valve body; Being communicated with valve body the 3rd hydraulic fluid port forms with second working connection and the relevant oil circuit of the 4th hydraulic fluid port; Wherein:
A, said shuttle valve are arranged between first working connection and second working connection; And position near first hydraulic fluid port, the 3rd hydraulic fluid port; One side filler opening of said shuttle valve is connected with first hydraulic fluid port of valve body, the opposite side filler opening is connected with the 3rd hydraulic fluid port of valve body, and the oil outlet of shuttle valve is connected with the filler opening of reduction valve through the oil duct that is arranged in the valve body;
The flow-off of b, said reduction valve and spring chamber oil drain out are connected with valve body the 5th hydraulic fluid port through the oil duct that is arranged in the valve body, and the oil outlet of reduction valve is connected with the filler opening and the hydraulic control mouth of pilot operated directional control valve through the oil duct that is arranged in the valve body;
The oil outlet of c, said pilot operated directional control valve is connected with valve body the 6th hydraulic fluid port, and the return opening of pilot operated directional control valve and spring chamber oil drain out are connected with valve body the 5th hydraulic fluid port through the oil duct that is arranged in the valve body;
The oil outlet of d, said long-range fluid control pressure compensation relief valve crosses with first working connection and is communicated with; Connectivity points is between the 4th throttle valve and the first working connection connectivity points and the shuttle valve and the first working connection connectivity points; Filler opening crosses with second working connection and is communicated with; The connectivity points that crosses and is connected with the 3rd hydraulic fluid port between the unidirectional equilibrium valve first main hydraulic fluid port and the second working connection connectivity points and the shuttle valve and the second working connection connectivity points;
One side hydraulic fluid port of e, first filtering plug is communicated with second working connection; Connectivity points crosses between connectivity points and the shuttle valve and the second working connection connectivity points between the long-range fluid control pressure compensation relief valve filler opening and second working connection, and the opposite side hydraulic fluid port is communicated with first throttle valve filler opening; Said first throttle valve oil outlet is communicated with the filler opening of sequence valve, and the oil outlet of sequence valve is communicated with the filler opening of second throttle valve, and the oil outlet of second throttle valve is connected through the pressure control hydraulic fluid port of valve inner oil duct with long-range fluid control pressure compensation relief valve; The filler opening of said first one-way valve crosses with the oil outlet of second throttle valve and is communicated with, and is connected through the pressure control hydraulic fluid port of valve inner oil duct with long-range fluid control pressure compensation relief valve; The oil outlet of first one-way valve is connected the valve inner oil duct between first filtering plug and first throttle valve and is connected, and is connected with the 3rd hydraulic fluid port through first filtering plug;
The filler opening of f, said relief valve crosses with second working connection and is communicated with; Oil outlet crosses with first working connection and is communicated with; The control oil channel of relief valve crosses with second working connection through the 3rd throttle valve, second filtering plug that connects successively and is communicated with, and connectivity points is on the filler opening of relief valve and second working connection cross second working connection between connectivity points and the 4th hydraulic fluid port; Wherein the filler opening of relief valve and second working connection cross connectivity points between second filtering plug and second working connection cross the second main hydraulic fluid port and the second working connection connectivity points of connectivity points and said unidirectional equilibrium valve; The oil outlet of relief valve and first working connection connectivity points that crosses crosses between the connectivity points between the oil outlet and first working connection of second hydraulic fluid port and said the 4th throttle valve;
G, said unidirectional equilibrium valve are arranged between second working connection with the mode of series connection; Wherein first of the unidirectional equilibrium valve main hydraulic fluid port is connected with the 3rd hydraulic fluid port of valve body; The second main hydraulic fluid port of unidirectional equilibrium valve is connected with the 4th hydraulic fluid port of valve body; The pressure control hydraulic fluid port of unidirectional equilibrium valve is connected with the filler opening of said the 4th throttle valve, and the oil outlet of the 4th throttle valve crosses with first working connection and is communicated with; Said second one-way valve and the 4th throttle valve are provided with in parallel; Said unidirectional equilibrium valve is made up of the 3rd one-way valve and external control relief valve in parallel; The filler opening of said the 3rd one-way valve crosses with external control relief valve below hydraulic fluid port and is communicated with; And is communicated with cross connection and be connected with the 4th hydraulic fluid port of hydraulic fluid port above the oil outlet of said the 3rd one-way valve and the external control relief valve through inner oil duct with the 3rd hydraulic fluid port through inner oil duct.
Beneficial effect of the present invention is following:
1.. through long-range fluid control pressure compensation relief valve secondary pressure protective function; In the time of can making the logical oil of machine system normal forward, high capacity work; Mask accidental pressure surge peak value with low relatively safety pressure, thereby avoid actuator frequently to bear unnecessary impact.
2.. when complete machine work runs into big working resistance; In the time of need doing work with the maximum functional ouput force; Press pooling feature through long-range fluid control pressure compensation relief valve secondary; The hydraulic pressure of exporting to actuator is slowly promoted, and actuator stem force also progressively is increased to the maximum ouput force of designing requirement thereupon, when guaranteeing that actuator can obtain maximum ouput force; Avoided direct impact, improved actuator's stress by low-pressure commendable increase to actuator that pressure maximum brings.
Description of drawings
Fig. 1 equilibrium valve hydraulic schematic diagram of the present invention.
Fig. 2 equilibrium valve applying examples of the present invention hydraulic schematic diagram.
Sequence number among the figure: 1 first filtering plug, 2 first throttle valves, 3 shuttle valves, 4 sequence valves, 5 first one-way valves; 6 second throttle valve, 7 reduction valve, 8 pilot operated directional control valves, 9 relief valves, 10 long-range fluid control pressure compensation relief valves; 11 the 3rd throttle valve, 12 second filtering plugs, 13 second one-way valves, 14 the 4th throttle valve, 15 unidirectional equilibrium valves; 15-1 the 3rd one-way valve, 15-2 external control relief valves, 16 brake couplings, 17 rope processing devices; 18 oil hydraulic motors, 19 speed reducer assemblies, 20 multi-way valve, 21 oil hydraulic pumps.
Embodiment
To combine embodiment's (accompanying drawing) to further describe below the present invention:
As shown in Figure 1, equilibrium valve of the present invention comprises valve body, be arranged on first filtering plug (1) in the valve body, first throttle valve (2), shuttle valve (3), sequence valve (4), first one-way valve (5), second throttle valve (6), reduction valve (7), pilot operated directional control valve (8), relief valve (9), long-range fluid control pressure compensation relief valve (10), the 3rd throttle valve (11), second filtering plug (12), second one-way valve (13), the 4th throttle valve (14), the unidirectional equilibrium valve of being made up of the 3rd one-way valve (15-1) and external control relief valve (15-2) (15) and connection valve body first hydraulic fluid port (V1) that is arranged in the valve body are formed with second working connection (V2-C2) and the relevant oil circuit of first working connection (V1-C1), connection valve body the 3rd hydraulic fluid port (V2) and the 4th hydraulic fluid port (C2) of second hydraulic fluid port (C1); Wherein:
A, said shuttle valve (3) are arranged between first working connection (V1-C1) and second working connection (V2-C2); And position near the first hydraulic fluid port V1, the 3rd hydraulic fluid port V2; One side filler opening of said shuttle valve is connected with first hydraulic fluid port (V1) of valve body, the opposite side filler opening is connected with the 3rd hydraulic fluid port (V2) of valve body, and the oil outlet of shuttle valve (3) is connected with the filler opening of reduction valve (7) through the oil duct (A-B) that is arranged in the valve body;
The flow-off of b, said reduction valve (7) and spring chamber oil drain out are connected with valve body the 5th hydraulic fluid port (T) through the oil duct that is arranged in the valve body, and the oil outlet of reduction valve (7) is connected with the filler opening and the hydraulic control mouth (H) of pilot operated directional control valve (8) through the oil duct that is arranged in the valve body;
The oil outlet of c, said pilot operated directional control valve (8) is connected with valve body the 6th hydraulic fluid port (BR), and the return opening of pilot operated directional control valve (8) and spring chamber oil drain out are connected with valve body the 5th hydraulic fluid port (T) through the oil duct that is arranged in the valve body;
The oil outlet of d, said long-range fluid control pressure compensation relief valve (10) crosses with first working connection (V1-C1) and is communicated with; Connectivity points (p) is between the 4th throttle valve (14) and first working connection (V1-C1) connectivity points (h) and the shuttle valve (3) and the first working connection connectivity points (a); Filler opening crosses with second working connection (V2-C2) and is communicated with; The connectivity points that crosses (q) and is connected with the 3rd hydraulic fluid port (V2) between unidirectional equilibrium valve (15) first main hydraulic fluid ports (F) and the second working connection connectivity points and the shuttle valve (3) and the second working connection connectivity points (b);
One side hydraulic fluid port of e, first filtering plug (1) is communicated with second working connection (V2-C2); Connectivity points (e) crosses between connectivity points (q) and the shuttle valve (3) and the second working connection connectivity points (b) between long-range fluid control pressure compensation relief valve filler opening and second working connection (V2-C2), and the opposite side hydraulic fluid port is communicated with first throttle valve (2) filler opening; Said first throttle valve (2) oil outlet is communicated with the filler opening of sequence valve (4); The oil outlet of sequence valve (4) is communicated with the filler opening of second throttle valve (6), and the oil outlet of second throttle valve (6) is connected through the pressure control hydraulic fluid port of valve inner oil duct (D-E) with long-range fluid control pressure compensation relief valve (10); The oil outlet of the filler opening of said first one-way valve (5) and second throttle valve (6) crosses and is communicated in (g) point, and is connected through the pressure control hydraulic fluid port of valve inner oil duct (D-E) with long-range fluid control pressure compensation relief valve (10); The oil outlet of first one-way valve (5) is connected the valve inner oil duct between first filtering plug (1) and first throttle valve (2) and is connected in point (f), and is connected with the 3rd hydraulic fluid port (V2) through first filtering plug (1);
The filler opening of f, said relief valve (9) crosses with second working connection (V2-C2) and is communicated with; Oil outlet crosses with first working connection (V1-C1) and is communicated with; The control oil channel of relief valve (9) crosses with second working connection (V2-C2) through the 3rd throttle valve (11), second filtering plug (12) that connects successively and is communicated with, and connectivity points (o) is on the filler opening of relief valve (9) and second working connection (V2-C2) cross second working connection (V2-C2) between connectivity points (n) and the 4th hydraulic fluid port (C2); Wherein the filler opening of relief valve (9) and second working connection (V2-C2) cross connectivity points between second filtering plug (12) and second working connection (V2-C2) cross the second main hydraulic fluid port (G) and the second working connection connectivity points of connectivity points and said unidirectional equilibrium valve (15); The oil outlet of relief valve (9) and first working connection (V1-C1) connectivity points that crosses crosses between the connectivity points (h) between the oil outlet and first working connection (V1-C1) of second hydraulic fluid port (C1) and said the 4th throttle valve (14);
G, said unidirectional equilibrium valve (15) are arranged between second working connection (V2-C2) with the mode of series connection; The first main hydraulic fluid port (F) of wherein unidirectional equilibrium valve (15) is connected with the 3rd hydraulic fluid port (V2) of valve body; The second main hydraulic fluid port (G) of unidirectional equilibrium valve (15) is connected with the 4th hydraulic fluid port (C2) of valve body; The pressure control hydraulic fluid port (J) of unidirectional equilibrium valve (15) is connected with the filler opening of said the 4th throttle valve (14) through inner oil duct (j) point, and the oil outlet of the 4th throttle valve (14) crosses with first working connection (V1-C1) through inner oil duct (i) point and is communicated with; Said second one-way valve (13) is provided with the 4th throttle valve (14) in parallel; Wherein the pressure control oil circuit (h-J) of the filler opening of second one-way valve (13) and unidirectional equilibrium valve (15) is intersected in (j) point, and the pressure control oil circuit (h-J) of the oil outlet of second one-way valve (13) and unidirectional equilibrium valve (15) is intersected in (i) point; Said unidirectional equilibrium valve (15) is made up of the 3rd one-way valve (15-1) and external control relief valve (15-2) in parallel; The filler opening of said the 3rd one-way valve (15-1) and external control relief valve (15-2) below hydraulic fluid port cross and are communicated in (k) point; And is communicated with the 3rd hydraulic fluid port (V2) through inner oil duct (F-V2), hydraulic fluid port crosses and is communicated in (l) and puts and be connected with the 4th hydraulic fluid port (C2) through inner oil duct (G-C2) above the oil outlet of said the 3rd one-way valve (15-1) and the external control relief valve (15-2).
Working principle of the present invention is following:
1. the working principle when forward leads to oil: during the logical oil of forward (actuator's heavy burden year acting); The hydraulic system high pressure oil gets into valve body from valve body the 3rd hydraulic fluid port (V2); (b) point in second working connection (V2-C2); Pressure oil is flowed to shuttle valve (3); Behind shuttle valve (3); Pressure oil gets into reduction valve (7) along inner oil duct (A-B), and in passing through the process of reduction valve (7), reduction valve (7) is reduced to the high-pressure value of host hydraulic system hydraulic oil and met output required pressure value and export pilot operated directional control valve (8) filler opening to and hydraulic control mouth (H); When the force value of pilot operated directional control valve (8) filler opening and hydraulic control mouth (H) reaches the switching-over force value of pilot operated directional control valve (8), pilot operated directional control valve (8) switching-over also will be delivered to valve body the 6th hydraulic fluid port (BR) through inner oil duct (I-BR) through the post-decompression pressure oil of reduction valve (7); Simultaneously; High pressure oil (F) point in second working connection (V2-C2) that gets in the valve body gets into unidirectional equilibrium valve (15); Because external control relief valve this moment (15-2) is in closed condition; Therefore high pressure oil is opened the 3rd one-way valve (15-1) and is circulated to (G) mouthful of unidirectional equilibrium valve (15), again along inner oil duct (G-C2) to actuator's transportation work hydraulic oil; Oil return through after actuator's acting gets into valve body through second hydraulic fluid port (C1), and is circulated to first hydraulic fluid port (V1) along first working connection (V1-C1), flows back to hydraulic oil container through system pipeline again.
Secondary pressed protection to realize principle when forward led to oil: with parallel way long-range fluid control pressure has been installed in valve inner second working connection (V2-C2) to first working connection (V1-C1) direction and has been compensated relief valve (10) and relief valve (9); The overflow cracking pressure initial set value that long-range fluid control pressure compensation relief valve (10) shields be Z (for example: 23) MPa, the overflow cracking pressure setting value of relief valve (9) be X (for example: 30) MPa and X>Z; In the logical oily process of forward; When occur flowing out the 4th hydraulic fluid port (C2) when pressure moment of actuator's output increases sharply and exceed long-range fluid control pressure compensation relief valve (10) initial set value; Long-range fluid control pressure compensation relief valve (10) beginning overflow; Make part gets into valve body by valve body the 3rd hydraulic fluid port (V2) working hydraulic pressure oil through passage (the long-range fluid control pressure compensation relief valve of q-(10)-p) directly be circulated to first working connection (V1-C1) and through (V1) mouthful off-load to hydraulic oil container; Make the energy that is delivered to actuator through the 4th hydraulic fluid port (C2) remove energy accordingly through the peak value part of long-range fluid control pressure compensation relief valve (10) off-load; Eliminated of the impact of hydraulic system peak value of pulse part, thereby realized protective action actuator to actuator.
Secondary pressed pooling feature to realize principle when forward led to oil: at valve inner; It serve as the functional unit that is in parallel with first one-way valve (5) again after connecting that the telecontrol oil circuit of long-range fluid control pressure compensation relief valve (10) is provided with first throttle valve (2), sequence valve (4), second throttle valve (6); And the work cracking pressure setting value of sequence valve (4) be Y (for example: 27) MPa, sequence valve (4) working pressure setting value Y between relief valve (9) working pressure X and long-range fluid control pressure compensation relief valve (10) initial pressure Z and X>Y>Z (for example: 30 MPa>27 MPa>23MPa); When occurring needing actuator with maximal work power outputting power operating mode; Because the value of long-range fluid control pressure compensation relief valve (10) initial pressure Z is minimum; At first long-range fluid control pressure compensation relief valve (a 10) beginning overflow and a shunting part are got into the flow of valve body by valve body the 3rd hydraulic fluid port (V2); Because actuator's maximal work power output operating mode needs from hydraulic system, to obtain corresponding big flow, and aforementioned big flow is greater than the specified overflow capability of long-range fluid control pressure compensation relief valve (10), under the effect effect of aperture; Hydraulic system pressure in second working connection (V2-C2) progressively promotes and reaches the work cracking pressure Y of sequence valve (4); It is also through-flow that sequence valve (4) spool is opened, after sequence valve (4) is opened, because the metering function of first throttle valve (2) and second throttle valve (6); The feasible pressure oil of introducing by second working connection (V2-C2) point (e); Through the telecontrol oil circuit of long-range fluid control pressure compensation relief valve (10), the pressure signal with hydraulic system affacts on the pressure control hydraulic fluid port of long-range fluid control pressure compensation relief valve (10) gradually, behind long-range fluid control pressure compensation relief valve (10) pressure control hydraulic fluid port spare system pressure; The hydraulic fluid port of long-range fluid control pressure compensation relief valve (10) is progressively closed; Along with progressively closing of long-range fluid control pressure compensation relief valve (10), the pressure in second working connection (V2-C2) can progressively raise thereupon, until reaching relief valve (9) work cracking pressure value X; The maximum limit that the working pressure of exporting to actuator via the 4th hydraulic fluid port (C2) this moment reaches permission is XMPa, and the mode with maximum ouput force of correspondence is done work by actuator.
2. the working principle when oppositely leading to oil: when reverse logical oily (actuator bears the underloading acting); The hydraulic system high pressure oil gets into valve body from valve body first hydraulic fluid port (V1); (a) point in first working connection (V1-C1); Pressure oil is circulated to shuttle valve (3) along oil circuit in the valve; Behind shuttle valve (3); Pressure oil gets into reduction valve (7) along inner oil duct (A-B), and in passing through the process of reduction valve (7), reduction valve (7) is reduced to the high-pressure value of host hydraulic system hydraulic oil and met reduction valve (7) output required pressure value and export pilot operated directional control valve (8) filler opening to and hydraulic control mouth (H); When the force value of pilot operated directional control valve (8) filler opening and hydraulic control mouth (H) reaches the switching-over force value of pilot operated directional control valve (8), pilot operated directional control valve (8) switching-over also will be delivered to valve body the 6th hydraulic fluid port (BR) through inner oil duct (I-BR) through the post-decompression pressure oil of reduction valve (7); Simultaneously; Get into high pressure oil (h) point in first working connection (V1-C1) in the valve body; Be circulated to point (i) through inner oil duct; This moment is because second one-way valve (13) is in the state of pass; Therefore pressure oil is through arriving the pressure control hydraulic fluid port (J) of unidirectional equilibrium valve (15) after the 4th throttle valve (14) current limliting; Hydraulic fluid pressure in first working connection (V1-C1) (the pressure control hydraulic fluid port (J) that also is unidirectional equilibrium valve (15) is located pressure) does not reach when external control relief valve (15-2) is worked the valve port cracking pressure in the unidirectional equilibrium valve (15); External control relief valve (15-2) is in closed condition, and simultaneously again because the 3rd one-way valve (15-1) in the unidirectional equilibrium valve (15) does not allow oppositely (being i → k direction) through-flow and be in closed condition equally, so the hydraulic fluid pressure in first working connection (V1-C1) is not when reaching external control relief valve (15-2) cracking pressure; The main hydraulic fluid port G of unidirectional equilibrium valve (15) can not be through-flow and be in closed condition to main hydraulic fluid port F direction, and hydraulic system is in the packing state that overcomes under the loading condition; When the hydraulic fluid pressure in first working connection (V1-C1) arrives middle external control relief valve (15-2) work of unidirectional equilibrium valve (15) valve port cracking pressure; External control relief valve (15-2) work valve port is opened; Hydraulic oil can be through-flow to main hydraulic fluid port F direction through the main hydraulic fluid port G of unidirectional equilibrium valve (15); Got into first working connection (V1-C1) this moment by valve body first hydraulic fluid port (V1) hydraulic oil flows out to actuator through second hydraulic fluid port (C1); Oil return after actuator's acting; Get into valve body through the 4th hydraulic fluid port (C2), also be circulated to the 3rd hydraulic fluid port (V2), flow back to hydraulic oil container through system pipeline again through external control relief valve (15-2) along second working connection (V2-C2); For long-range fluid control pressure compensation relief valve (10); Because the starting point (e) of its telecontrol oil circuit directly is connected with valve body the 3rd hydraulic fluid port (V2) and locates unloading condition through the valve inner oil duct; Carrying out reverse logical oily operating mode zero-time; Serve as the parallelly connected two ends of putting of functional unit that are in parallel with first one-way valve (5) again after the series connection with first throttle valve (2), sequence valve (4), second throttle valve (6) in the telecontrol oil circuit of long-range fluid control pressure compensation relief valve (10); Form pressure difference and point (g) force value between parallel connection point (g) and point (f) greater than point (f) force value; Under of the effect of point (g) force value greater than point (f) force value; The pressure oil that acts on long-range fluid control pressure compensation relief valve (10) pressure control hydraulic fluid port reaches point (g) through valve inner passage (E-D); At point (g); Pressure oil is circulated to point (f) after opening first one-way valve (5); Be circulated to point (e) through first filtering plug (1) again and valve body the 3rd hydraulic fluid port (V2) of finally flowing through returns hydraulic oil container, make pressure oil and the pressure oil that acts on sequence valve (4) filler opening place off-load simultaneously in the pressure control hydraulic fluid port that acts on long-range fluid control pressure compensation relief valve (10), the valve port cracking pressure that makes long-range fluid control pressure compensate relief valve (10) is returned to initial setting state of value (being that the valve port cracking pressure is returned to initial set value Z MPa); Sequence valve (4) valve port is closed, play secondary during for the logical oil of forward once more and press protection and secondary to press two functions of buffering to get ready.
3. the working principle when stopping logical oil (promptly not working): when system stop through valve of the present invention to actuator's delivery hydraulic pressure can the time (actuator stopped acting and was in halted state this moment); First hydraulic fluid port (V1) of valve of the present invention and the 3rd hydraulic fluid port (V2) directly are communicated with back hydraulic oil container and off-load through system pipeline, and the relative pressure of valve body first hydraulic fluid port (V1) and valve body the 3rd hydraulic fluid port (V2) is zero at this moment; At valve inner; Because the filler opening (a) in the filler opening of shuttle valve (3) two ends communicates with valve body first hydraulic fluid port (V1), filler opening (b) communicates with valve body the 3rd hydraulic fluid port (V2); Therefore shuttle valve (3) is in unloading condition; Act on the filler opening of pilot operated directional control valve (8) and pressure oil that hydraulic control mouth (H) is located and be circulated to shuttle valve (3) through reduction valve (7), inner oil duct (A-B); And finally through valve body first hydraulic fluid port (V1) and (/ or) valve body the 3rd hydraulic fluid port (V2) and off-load (promptly flowing back to hydraulic oil container); When the hydraulic control mouth (H) that makes pilot operated directional control valve (8) owing to aforementioned off-load is located force value and is lower than the switching-over force value of pilot operated directional control valve (8); The valve core reset of pilot operated directional control valve (8); Via valve body the 6th hydraulic fluid port (BR) outwards the pressure oil of output flow back to pilot operated directional control valve (8) through inner oil duct (I-BR), be passed to the system pipeline that valve body the 5th hydraulic fluid port (T) and warp be connected with valve body the 5th hydraulic fluid port (T) through pilot operated directional control valve (8) and valve inner oil duct (c-d-T) again and directly be communicated with back hydraulic oil container, thus the pressure oil off-load that valve body the 6th hydraulic fluid port (BR) is located; (h) point in valve inner first working connection (V1-C1); Owing to (h) directly be communicated with and off-load with valve body first hydraulic fluid port (V1); Make and stopping logical oily operating mode zero-time; (i) some place force value of second one-way valve (13) and the 4th throttle valve (14) parallel component is lower than (j) some place force value; Second one-way valve (13) is opened rapidly under the effect of (j) point to (i) some directional pressure difference; (J-j-second one-way valve (13)-i-h) is circulated to valve body first hydraulic fluid port (V1) and off-load rapidly through inner oil duct to make the pressure oil that acts on unidirectional equilibrium valve (15) the pressure control hydraulic fluid port (J); External control relief valve (15-2) work valve port is closed in the unidirectional equilibrium valve (15); Under inner external control relief valve of unidirectional equilibrium valve (15) (15-2) and the 3rd one-way valve (15-1) the while edge main hydraulic fluid port of unidirectional equilibrium valve (15) (G) to the pent situation of main hydraulic fluid port (F) direction; Second working connection (V2-C2) can not be from valve body the 4th hydraulic fluid port (C2) to the logical oil of the 3rd hydraulic fluid port (V2) direction, and the hydraulic oil between actuator's to the four hydraulic fluid ports (C2) this moment can not be from the 4th hydraulic fluid port (C2) to the circulation of the 3rd hydraulic fluid port (V2) direction, and the 4th hydraulic fluid port (C2) to the hydraulic pipe line between actuator is in packing state; For long-range fluid control pressure compensation relief valve (10); Because the starting point (e) of its telecontrol oil circuit directly is connected with valve body the 3rd hydraulic fluid port (V2) and locates unloading condition through the valve inner oil duct; Stop logical oily operating mode zero-time in execution; Serve as the parallelly connected two ends of putting of functional unit that are in parallel with first one-way valve (5) again after the series connection with first throttle valve (2), sequence valve (4), second throttle valve (6) in the telecontrol oil circuit of long-range fluid control pressure compensation relief valve (10); Form pressure difference and point (g) force value between parallel connection point (g) and point (f) greater than point (f) force value; Under of the effect of point (g) force value greater than point (f) force value; The pressure oil that acts on long-range fluid control pressure compensation relief valve (10) pressure control hydraulic fluid port reaches point (g) through valve inner passage (E-D);, point (g) pressure oil is circulated to point (f) after opening first one-way valve (5); Be circulated to point (e) through first filtering plug (1) again and valve body the 3rd hydraulic fluid port (V2) of finally flowing through returns hydraulic oil container; Make pressure oil and the pressure oil that acts on sequence valve (4) filler opening place off-load simultaneously in the pressure control hydraulic fluid port that acts on long-range fluid control pressure compensation relief valve (10); Make the valve port cracking pressure of long-range fluid control pressure compensation relief valve (10) be returned to initial setting state of value (being that the valve port cracking pressure is returned to initial set value Z MPa), sequence valve (4) valve port is closed, play secondary during for the logical oil of forward once more and press protection and secondary to press two functions of buffering to get ready.
Application example introduction of the present invention is following:
As shown in Figure 2, the control system with the hoist master winch below the present invention is an example, and the applicable cases of valve of the present invention is introduced:
A. the working principle during the logical oil of forward (the master winch lift heavy hoists): when handling multi-way valve (20) handle and make the multi-way valve spool be in (2) number working position; The high-pressure and hydraulic oil of oil hydraulic pump (21) output gets into equilibrium valve second working connection of the present invention (V2-C2) through the host hydraulic system pipeline by valve body the 3rd hydraulic fluid port (V2); (b) point in second working connection (V2-C2); Pressure oil is flowed to shuttle valve (3); Behind shuttle valve (3); Pressure oil gets into reduction valve (7) along inner oil duct (A-B); In passing through the process of reduction valve (7); Reduction valve (7) is reduced to the high-pressure value of host hydraulic system hydraulic oil and is met output required pressure value and export pilot operated directional control valve (8) filler opening to and hydraulic control mouth (H); When the force value of pilot operated directional control valve (8) filler opening and hydraulic control mouth (H) reaches the switching-over force value of pilot operated directional control valve (8), pilot operated directional control valve (8) switching-over also will be delivered to valve body the 6th hydraulic fluid port (BR) through inner oil duct (I-BR) through the post-decompression pressure oil of reduction valve (7), through the system's hydraulic pipe line that is connected with valve body the 6th hydraulic fluid port (BR); Hydraulic oil affacts the brake coupling (16) and the rope processing device (17) of master winch assembly respectively, and the brake coupling (16) that control oil hydraulic motor (18) is rotatablely moved separates and gets ready, makes the rope processing device (17) that compresses wire rope to break away from wire rope and rotate ready for wire rope together in company with speed reducer assembly (19) for oil hydraulic motor begins rotary work; Simultaneously; High pressure oil (F) point in second working connection (V2-C2) that gets in the valve body gets into unidirectional equilibrium valve (15); Because external control relief valve this moment (15-2) is in closed condition; Therefore high pressure oil is opened the 3rd one-way valve (15-1) and is circulated to (G) mouthful of unidirectional equilibrium valve (15); Again along inner oil duct (G-C2) with the system's hydraulic pipe line that is connected with valve body the 4th hydraulic fluid port (C2) to oil hydraulic motor (18) transportation work hydraulic oil; Can change hydraulic pressure into mechanical energy and drive speed reducer assembly (19) through oil hydraulic motor (18) and rotate and overcome the lifted weight load and do work, through the oil return after actuator's acting, through circulate back valve body second hydraulic fluid port (C1) and get into valve body of system's hydraulic pipe line; Be circulated to first hydraulic fluid port (V1) along first working connection (V1-C1), flow back to hydraulic oil container through system's hydraulic pipe line, multi-way valve (20) again; In the logical oily working procedure of aforementioned positive; Produce the pressure surge peak value if meet accidental hydraulic pressure fluctuation; And when exceeding long-range fluid control pressure compensation relief valve (10) initial set value; Long-range fluid control pressure compensation relief valve (10) beginning overflow; Make part gets into valve body by valve body the 3rd hydraulic fluid port (V2) working hydraulic pressure oil through passage (the long-range fluid control pressure compensation relief valve of q-(10)-p) directly be circulated to first working connection (V1-C1) and through (V1) mouthful off-load to hydraulic oil container; Make the energy that is delivered to oil hydraulic motor (18) through the 4th hydraulic fluid port (C2) remove peak value portion of energy accordingly, eliminated of the impact of hydraulic system peak value of pulse, thereby realized secondary pressure protective action actuator to actuator through the off-load of long-range fluid control pressure compensation relief valve (10); If when main frame need lift by crane the ultimate load of permission; The hydraulic oil that enters into (q) point in valve body second working connection (V2-C2) is at first through long-range fluid control pressure compensation relief valve (a 10) off-load part; Maximum gradually and when exceeding the specified spillway discharge in the long-range fluid control pressure compensation relief valve (10) when the hydraulic fluid flow rate of input valve body; Under the effect effect of aperture; System pressure in second working connection (V2-C2) progressively promotes and reaches the work unlatching pressure of sequence valve (4), and it is also through-flow that sequence valve (4) spool is opened, in the metering function of first throttle valve (2) and second throttle valve (6); Pressure oil through second working connection (V2-C2) point (e) introducing; Through the telecontrol oil circuit of long-range fluid control pressure compensation relief valve (10), the pressure signal with hydraulic system affacts on the pressure control hydraulic fluid port of long-range fluid control pressure compensation relief valve (10) gradually, and the hydraulic fluid port of long-range fluid control pressure compensation relief valve (10) is progressively closed; Along with progressively closing of long-range fluid control pressure compensation relief valve (10) valve port; Pressure in second working connection (V2-C2) can raise thereupon gradually, and until reaching relief valve (9) work cracking pressure value, the working pressure of exporting to oil hydraulic motor (18) via the 4th hydraulic fluid port (C2) this moment reaches the greatest limit pressure of permission; Speed reducer assembly (19) is with the mode hoisting heavy with maximum ouput force of correspondence; Aforementioned with maximum load power working procedure in because valve of the present invention can realize and control the working pressure that exports oil hydraulic motor (18) to progressively being increased to the maximum pressure value that design allows by the secondary pressure value through time-delay automatically, thereby avoided the working pressure value directly to be loaded into the direct impact of maximum value to oil hydraulic motor and transmission system from the zero-pressure value; Played buffer protection function, improved the master winch working condition actuator.
Working principle during b. reverse logical oil (master winch declines): when manipulation multi-way valve (20) handle makes the multi-way valve spool be in (1) number working position; The high-pressure and hydraulic oil of oil hydraulic pump (21) output gets into equilibrium valve first working connection of the present invention (V1-C1) through the host hydraulic system pipeline by valve body first hydraulic fluid port (V1); (a) point in first working connection (V1-C1); Pressure oil is flowed to shuttle valve (3); Behind shuttle valve (3); Pressure oil gets into reduction valve (7) along inner oil duct (A-B); In passing through the process of reduction valve (7); Reduction valve (7) is reduced to the high-pressure value of host hydraulic system hydraulic oil and is met output required pressure value and export pilot operated directional control valve (8) filler opening to and hydraulic control mouth (H); When the force value of pilot operated directional control valve (8) filler opening and hydraulic control mouth (H) reaches the switching-over force value of pilot operated directional control valve (8), pilot operated directional control valve (8) switching-over also will be delivered to valve body the 6th hydraulic fluid port (BR) through inner oil duct (I-BR) through the post-decompression pressure oil of reduction valve (7), through the system's hydraulic pipe line that is connected with valve body the 6th hydraulic fluid port (BR); Hydraulic oil affacts the brake coupling (16) and the rope processing device (17) of master winch assembly respectively, and the brake coupling (16) that control oil hydraulic motor (18) is rotatablely moved separates and gets ready, makes the rope processing device (17) that compresses wire rope to break away from wire rope and rotate ready for wire rope together in company with speed reducer assembly (19) for oil hydraulic motor begins rotary work; Simultaneously; Get into high pressure oil (h) point in first working connection (V1-C1) in the valve body; Be circulated to point (i) through inner oil duct; This moment is because second one-way valve (13) is in the state of pass; Therefore pressure oil is through arriving the pressure control hydraulic fluid port (J) of unidirectional equilibrium valve (15) after the 4th throttle valve (14) current limliting; When the hydraulic fluid pressure in first working connection (V1-C1) (the pressure control hydraulic fluid port (J) that also is unidirectional equilibrium valve (15) is located pressure) did not reach in the unidirectional equilibrium valve (15) external control relief valve (15-2) work valve port cracking pressure, external control relief valve (15-2) was in closed condition, simultaneously again because the 3rd one-way valve (15-1) in the unidirectional equilibrium valve (15) does not allow oppositely (being i → k direction) through-flow and be in closed condition equally; When therefore the hydraulic fluid pressure in first working connection (V1-C1) does not reach external control relief valve (15-2) cracking pressure; The main hydraulic fluid port G of unidirectional equilibrium valve (15) can not be through-flow and be in closed condition to main hydraulic fluid port F direction, and oil hydraulic motor (18) and speed reducer assembly (19) at this moment can not rotary works, and hydraulic system is in the packing state that overcomes under the loading condition; When the hydraulic fluid pressure in first working connection (V1-C1) arrives middle external control relief valve (15-2) work of unidirectional equilibrium valve (15) valve port cracking pressure; External control relief valve (15-2) work valve port is opened; Hydraulic oil is through-flow to main hydraulic fluid port F direction through the main hydraulic fluid port G of unidirectional equilibrium valve (15); The hydraulic oil that is got into first working connection (V1-C1) this moment by valve body first hydraulic fluid port (V1) is circulated to oil hydraulic motor (18) and drive speed reducer assembly (19) rotation and acting through second hydraulic fluid port (C1) outflow and through system's hydraulic pipe line; Oil return after the acting; Through circulate back the 4th hydraulic fluid port (C2) and get into valve body of system's hydraulic pipe line, along second working connection (V2-C2) and be circulated to the 3rd hydraulic fluid port (V2), flow back to hydraulic oil container through system's hydraulic pipe line, multi-way valve (20) again through external control relief valve (15-2); For long-range fluid control pressure compensation relief valve (10); Because the starting point (e) of its telecontrol oil circuit directly is connected with valve body the 3rd hydraulic fluid port (V2) through the valve inner oil duct; When execution is oppositely led to oil; The pressure oil that acts on long-range fluid control pressure compensation relief valve (10) pressure control hydraulic fluid port reaches point (g) through valve inner passage (E-D); At point (g); Pressure oil is circulated to point (f) after opening first one-way valve (5); Be circulated to point (e) through first filtering plug (1) again and finally flow through valve body the 3rd hydraulic fluid port (V2), system's hydraulic pipe line, multi-way valve (20) flow back to hydraulic oil container; Make pressure oil and the pressure oil that acts on sequence valve (4) filler opening place off-load simultaneously in the pressure control hydraulic fluid port that acts on long-range fluid control pressure compensation relief valve (10), the valve port cracking pressure of long-range fluid control pressure compensation relief valve this moment (10) is returned to the initial setting state of value, sequence valve (4) valve port is closed, and plays secondary during for the logical oil of forward once more and presses protection and secondary to press two functions of buffering to get ready.
Working principle when c. stopping logical oil (master winch stops the rotation and do not work): when handling multi-way valve (20) handle and make the multi-way valve spool be in (0) number working position; The hydraulic oil of oil hydraulic pump (21) output through the inner oil duct of multi-way valve (20) directly flow back to hydraulic oil container and do not get into equilibrium valve of the present invention and this moment equilibrium valve first hydraulic fluid port of the present invention (V1) directly be connected through system's hydraulic pipe line and multi-way valve (20) with the 3rd hydraulic fluid port (V2) with hydraulic oil container, the relative pressure that makes valve body first hydraulic fluid port (V1) and the 3rd hydraulic fluid port (V2) is zero; At valve inner; Because the filler opening (a) in the filler opening of shuttle valve (3) two ends communicates with valve body first hydraulic fluid port (V1), filler opening (b) communicates with valve body the 3rd hydraulic fluid port (V2); Therefore shuttle valve (3) is in unloading condition; Act on the filler opening of pilot operated directional control valve (8) and pressure oil that hydraulic control mouth (H) is located and be circulated to shuttle valve (3) through reduction valve (7), inner oil duct (A-B); And it is final through first hydraulic fluid port (V1) and (/ or) the 3rd hydraulic fluid port (V2) and off-load (promptly flowing back to hydraulic oil container); When making the hydraulic control mouth (H) of pilot operated directional control valve (8) locate force value to be lower than the switching-over force value of pilot operated directional control valve (8) when aforementioned off-load; The valve core reset of pilot operated directional control valve (8); Pressure oil via the outside output of valve body the 6th hydraulic fluid port (BR) and control brake clutch (16) and rope processing device (17) flows back to pilot operated directional control valve (8) through system's hydraulic pipe line and the inner oil duct of valve of the present invention (I-BR); Be passed to the system pipeline that valve body the 5th hydraulic fluid port (T) and warp be connected with valve body the 5th hydraulic fluid port (T) through pilot operated directional control valve (8) and valve inner oil duct (c-d-T) again and directly be communicated with back hydraulic oil container; Make the master winch assembly brake coupling (16) that is connected with valve body the 6th hydraulic fluid port (BR) and the hydraulic oil off-load of rope processing device (17), thereby the brake coupling (16) that control oil hydraulic motor (18) is rotatablely moved resets and locks oil hydraulic motor, makes the rope processing device (17) that compresses wire rope compress wire rope again; (h) point in valve inner first working connection (V1-C1); Owing to (h) directly be communicated with and off-load with valve body first hydraulic fluid port (V1); Make and stopping logical oily operating mode zero-time; (i) some place force value of second one-way valve (13) and the 4th throttle valve (14) parallel component is lower than (j) some place force value; Second one-way valve (13) is opened rapidly under the effect of (j) point to (i) some directional pressure difference; (J-j-second one-way valve (13)-i-h) is circulated to valve body first hydraulic fluid port (V1) and off-load rapidly through inner oil duct to act on pressure oil on unidirectional equilibrium valve (15) the pressure control hydraulic fluid port (J); External control relief valve (15-2) work valve port is closed in the unidirectional equilibrium valve (15); Under inner external control relief valve of unidirectional equilibrium valve (15) (15-2) and the 3rd one-way valve (15-1) the while edge main hydraulic fluid port of unidirectional equilibrium valve (15) (G) to the pent situation of main hydraulic fluid port (F) direction; Second working connection (V2-C2) can not be from valve body the 4th hydraulic fluid port (C2) to the logical oil of the 3rd hydraulic fluid port (V2) direction; Hydraulic oil between oil hydraulic motor (18) load one side to the, four hydraulic fluid ports (C2) this moment can not be from the 4th hydraulic fluid port (C2) to the circulation of the 3rd hydraulic fluid port (V2) direction, and the hydraulic pipe line between oil hydraulic motor (18) load side to the four hydraulic fluid ports (C2) is in packing state, thereby guarantees that master winch speed reducer assembly (19) lifted weight can not be fallen by safety locking voluntarily; For long-range fluid control pressure compensation relief valve (10); Because the starting point (e) of its telecontrol oil circuit directly is connected with valve body the 3rd hydraulic fluid port (V2) and locates unloading condition through the valve inner oil duct; When execution stops to lead to the oil operation; The pressure oil that acts on long-range fluid control pressure compensation relief valve (10) pressure control hydraulic fluid port reaches point (g) through valve inner passage (E-D);, point (g) pressure oil is circulated to point (f) after opening first one-way valve (5); Be circulated to point (e) through first filtering plug (1) again and finally flow through valve body the 3rd hydraulic fluid port (V2), system's hydraulic pipe line, multi-way valve (20) flow back to hydraulic oil container; Make pressure oil and the pressure oil that acts on sequence valve (4) filler opening place off-load simultaneously in the pressure control hydraulic fluid port that acts on long-range fluid control pressure compensation relief valve (10); The valve port cracking pressure of long-range fluid control pressure compensation relief valve this moment (10) is returned to the initial setting state of value, sequence valve (4) valve port is closed, and plays secondary during for the logical oil of forward once more and presses protection and secondary to press two functions of buffering to get ready.

Claims (1)

1. equilibrium valve with secondary pressure buffer protection function is characterized in that: this equilibrium valve comprises valve body, be arranged on first filtering plug (1) in the valve body, first throttle valve (2), shuttle valve (3), sequence valve (4), first one-way valve (5), second throttle valve (6), reduction valve (7), pilot operated directional control valve (8), relief valve (9), long-range fluid control pressure compensation relief valve (10), the 3rd throttle valve (11), second filtering plug (12), second one-way valve (13), the 4th throttle valve (14), the unidirectional equilibrium valve of being made up of the 3rd one-way valve (15-1) and external control relief valve (15-2) (15) and connection valve body first hydraulic fluid port (V1) that is arranged in the valve body are formed with second working connection (V2-C2) and the relevant oil circuit of first working connection (V1-C1), connection valve body the 3rd hydraulic fluid port (V2) and the 4th hydraulic fluid port (C2) of second hydraulic fluid port (C1); Wherein:
A, said shuttle valve (3) are arranged between first working connection (V1-C1) and second working connection (V2-C2); And position near first hydraulic fluid port (V1), the 3rd hydraulic fluid port (V2); One side filler opening of said shuttle valve is connected with first hydraulic fluid port (V1) of valve body, the opposite side filler opening is connected with the 3rd hydraulic fluid port (V2) of valve body, and the oil outlet of shuttle valve (3) is connected with the filler opening of reduction valve (7) through the oil duct (A-B) that is arranged in the valve body;
The flow-off of b, said reduction valve (7) and spring chamber oil drain out are connected with valve body the 5th hydraulic fluid port (T) through the oil duct that is arranged in the valve body, and the oil outlet of reduction valve (7) is connected with the filler opening and the hydraulic control mouth (H) of pilot operated directional control valve (8) through the oil duct that is arranged in the valve body;
The oil outlet of c, said pilot operated directional control valve (8) is connected with valve body the 6th hydraulic fluid port (BR), and the return opening of pilot operated directional control valve (8) and spring chamber oil drain out are connected with valve body the 5th hydraulic fluid port (T) through the oil duct that is arranged in the valve body;
The oil outlet of d, said long-range fluid control pressure compensation relief valve (10) crosses with first working connection (V1-C1) and is communicated with; Connectivity points (p) is between the 4th throttle valve (14) and first working connection (V1-C1) connectivity points (h) and the shuttle valve (3) and the first working connection connectivity points (a); Filler opening crosses with second working connection (V2-C2) and is communicated with; The connectivity points that crosses (q) and is connected with the 3rd hydraulic fluid port (V2) between unidirectional equilibrium valve (15) first main hydraulic fluid ports (F) and the second working connection connectivity points and the shuttle valve (3) and the second working connection connectivity points (b);
One side hydraulic fluid port of e, first filtering plug (1) is communicated with second working connection (V2-C2); Connectivity points (e) crosses between connectivity points (q) and the shuttle valve (3) and the second working connection connectivity points (b) between long-range fluid control pressure compensation relief valve filler opening and second working connection (V2-C2), and the opposite side hydraulic fluid port is communicated with first throttle valve (2) filler opening; Said first throttle valve (2) oil outlet is communicated with the filler opening of sequence valve (4); The oil outlet of sequence valve (4) is communicated with the filler opening of second throttle valve (6), and the oil outlet of second throttle valve (6) is connected through the pressure control hydraulic fluid port of valve inner oil duct (D-E) with long-range fluid control pressure compensation relief valve (10); The filler opening of said first one-way valve (5) crosses with the oil outlet of second throttle valve (6) and is communicated with, and is connected through the pressure control hydraulic fluid port of valve inner oil duct (D-E) with long-range fluid control pressure compensation relief valve (10); The oil outlet of first one-way valve (5) is connected the valve inner oil duct between first filtering plug (1) and first throttle valve (2) and is connected, and is connected with the 3rd hydraulic fluid port (V2) through first filtering plug (1);
The filler opening of f, said relief valve (9) crosses with second working connection (V2-C2) and is communicated with; Oil outlet crosses with first working connection (V1-C1) and is communicated with; The control oil channel of relief valve (9) crosses with second working connection (V2-C2) through the 3rd throttle valve (11), second filtering plug (12) that connects successively and is communicated with, and connectivity points (o) is on the filler opening of relief valve (9) and second working connection (V2-C2) cross second working connection (V2-C2) between connectivity points (n) and the 4th hydraulic fluid port (C2); Wherein the filler opening of relief valve (9) and second working connection (V2-C2) cross connectivity points between second filtering plug (12) and second working connection (V2-C2) cross the second main hydraulic fluid port (G) and the second working connection connectivity points of connectivity points and said unidirectional equilibrium valve (15); The oil outlet of relief valve (9) and first working connection (V1-C1) connectivity points that crosses crosses between the connectivity points (h) between the oil outlet and first working connection (V1-C1) of second hydraulic fluid port (C1) and said the 4th throttle valve (14);
G, said unidirectional equilibrium valve (15) are arranged between second working connection (V2-C2) with the mode of series connection; The first main hydraulic fluid port (F) of wherein unidirectional equilibrium valve (15) is connected with the 3rd hydraulic fluid port (V2) of valve body; The second main hydraulic fluid port (G) of unidirectional equilibrium valve (15) is connected with the 4th hydraulic fluid port (C2) of valve body; The pressure control hydraulic fluid port (J) of unidirectional equilibrium valve (15) is connected with the filler opening of said the 4th throttle valve (14), and the oil outlet of the 4th throttle valve (14) crosses with first working connection (V1-C1) and is communicated with; Said second one-way valve (13) is provided with the 4th throttle valve (14) in parallel; Said unidirectional equilibrium valve (15) is made up of the 3rd one-way valve (15-1) and external control relief valve (15-2) in parallel; The filler opening of said the 3rd one-way valve (15-1) crosses with external control relief valve (15-2) below hydraulic fluid port and is communicated with; And is communicated with cross connection and be connected with the 4th hydraulic fluid port (C2) of hydraulic fluid port above the oil outlet of said the 3rd one-way valve (15-1) and the external control relief valve (15-2) through inner oil duct (F-V2) with the 3rd hydraulic fluid port (V2) through inner oil duct (G-C2).
CN 201010610137 2010-12-29 2010-12-29 Balance valve having two-stage pressure buffering protection function Expired - Fee Related CN101994727B (en)

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CN102935452B (en) * 2012-10-31 2015-07-22 温州亿顿液压科技有限公司 Full-hydraulic type punch press
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CN103574013A (en) * 2013-11-01 2014-02-12 江苏柳工机械有限公司 Flow sensitive type buffer device
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