CN104653539B - A kind of proportional hydraulic balanced valve - Google Patents
A kind of proportional hydraulic balanced valve Download PDFInfo
- Publication number
- CN104653539B CN104653539B CN201510092571.7A CN201510092571A CN104653539B CN 104653539 B CN104653539 B CN 104653539B CN 201510092571 A CN201510092571 A CN 201510092571A CN 104653539 B CN104653539 B CN 104653539B
- Authority
- CN
- China
- Prior art keywords
- valve
- valve body
- spring
- fluid port
- hydraulic fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a kind of proportional hydraulic balanced valve, belong to field of hydraulic control.This device includes valve body, the pilot valve being arranged on valve body main valve chamber one end, is arranged on the valve end cap of the valve body main valve chamber other end, by back tightening nut spinning regulation screw on valve end cap；Being sequentially installed with main valve plug, centering steel ball, valve core spring seat, spring, regulation spring base by pilot valve one end to valve end cap one end in described main valve chamber, described regulation spring base is between spring and regulation screw；Being provided with check valve in described valve body, the oil-in of check valve communicates with the first hydraulic fluid port on valve body, and the oil-out of check valve is communicated with the second hydraulic fluid port on valve body by the step groove of main valve plug；The valve pocket that pilot valve spool is formed with main valve plug communicates with the first hydraulic fluid port on valve body；The valve pocket formed between main valve plug with regulation spring base communicates with the 3rd hydraulic fluid port on valve body.The present invention realizes the decrease speed of proportion adjustment load by pressure regulation, declines process the most reliable.
Description
Technical field
The present invention relates to the technical field of hydraulic such as engineering machinery, mining machinery, especially relate to a kind of proportional hydraulic
Balanced valve.
Background technology
Along with the maximization of engineering mechanical device, the power stage of hydraulic system is also at rapid increase, and high-power level performs unit
Part hydraulic motor or hydraulic jack will use hydraulically balanced valve.As the key element of hydraulic system, current big orifice liquid
Pressure balanced valve, when heavy duty speed governing on a large scale, balanced valve spool is difficult to stable on the position of certain aperture, makes to be supported on decline
During occur that speed governing is unstable, compression shock is big, jitter phenomenon occurs, causes the biggest potential safety hazard to equipment, make hydraulic pressure system
The reliability of system and Hydraulic Elements reduces, and the life-span declines.
Summary of the invention
The purpose of the present invention provides a kind of proportional hydraulic just for the weak point in the presence of above-mentioned prior art
Balanced valve.The present invention is the regulation by external control signal pressure, it is ensured that balanced valve can proportion adjustment load lower reduction of speed
Degree, makes decline process steadily reliable, and can pressurize not reveal when halted state.
The purpose of the present invention can be realized by following technique measures:
The proportional hydraulic balanced valve of the present invention includes valve body, the pilot valve being arranged on valve body main valve chamber one end, is arranged on valve body
The valve end cap of the main valve chamber other end, by back tightening nut spinning regulation screw on valve end cap；By leading in described main valve chamber
Valve one end is sequentially installed with main valve plug, centering steel ball, valve core spring seat, spring, regulation spring base, described tune to valve end cap one end
Joint spring base is between spring and regulation screw；Check valve it is provided with, the oil-in of check valve and valve body in described valve body
First hydraulic fluid port communicates, and the oil-out of check valve is communicated with valve body the second hydraulic fluid port by the step groove of main valve plug；Leading of described pilot valve
The valve pocket that valve core is formed with main valve plug communicates with valve body the first hydraulic fluid port；Main valve plug and regulation spring base between formed valve pocket with
Valve body the 3rd hydraulic fluid port communicates.
The present invention along described main valve plug axially arranged have first step, second step, the 3rd step, the 4th step,
Five steps, first step end is machined with the conical surface, cooperatively forms cone with valve body main valve chamber corresponding position and seals, second step
Being machined with throttle-flow groove, coordinate with valve body main valve chamber corresponding position and realize proportional flow regulation, the 3rd step is through-flow stream
Measuring tank, the 4th step is machined with seal groove, and the difference in areas of the 4th step and second step is balanced valve self-unloading acting surface.
Being provided with spring I, nonreturn valve core, screw thread valve seat in heretofore described pilot valve, nonreturn valve core has with radially
Damping and axially damping, described screw thread valve seat and valve body the 4th hydraulic fluid port communicate, and coordinate with nonreturn valve core in being arranged on pilot valve chamber
Realizing two-way pair to damp, conflicts and makes nonreturn valve core reset and the tactile sealing of Thread valve seated connection, spring I in nonreturn valve core and spring I one end
The other end and pilot valve hole step are conflicted；Described check valve includes check valve valve body, has spring II, check valve in one-way valve body
Spool, described spring II is arranged between inner elements of check valve and check valve valve body, makes to be formed between inner elements of check valve and valve body
Seal and coordinate.
More specifically, the technique mouth end at the oil-out of check valve is provided with plug；Described centering steel ball is positioned at main valve plug
In right-hand member groove and inconsistent with valve core spring seat, described valve core spring seat is conflicted with spring III left end, described spring III right-hand member with
Regulation spring base is conflicted, and described regulation screw is conflicted with regulation spring base by valve end cap and back tightening nut.
Proportional hydraulic balanced valve of the present invention is by the way of precession or screwing out regulation screw, thus it is possible to vary spring III
Decrement, thus realize regulating the pressure unloading of hydraulically balanced valve, effectively protect executive component, main valve plug can be according to valve body the
The pressure signal change of four hydraulic fluid ports, proportionally limits the flow from valve body the second hydraulic fluid port to valve body the first hydraulic fluid port, when valve body the
When four hydraulic fluid port pressure signals are constant, main valve plug also is able to stable at correspondence position, cone can be avoided to seal disturbance that valve produces and
Shake defect, can solve the manufacture bottleneck of screw-in cartridge valve big orifice, and the defect that guiding valve balanced valve amount of leakage is big, compare
Prior art has the advantages such as simple in construction, easy to process, low cost, proportionality are good.
Beneficial effects of the present invention is as follows:
1, described a kind of proportional hydraulic balanced valve, it is possible to the speed of service of regulation heavy duty executive component, speed in proportion
Adjustable range is big, and stability is high, can be prevented effectively from appearance and decline shake defect；
2, described a kind of proportional hydraulic balanced valve, by adjusting main valve plug second step and the size of the 4th stepped diameters
Relation, it is possible to obtain the proportional hydraulic balanced valve of band self-unloading function or the proportional hydraulic balanced valve without self-unloading function；
3, described a kind of proportional hydraulic balanced valve, through-current capability is big, can solve plug-in mounting balanced valve through-current capability bottleneck,
During load lifting, crushing is little, response is fast, loads smooth decreasing, is affected by the fluctuation of load little, especially without self-unloading function
Proportional balancing valve, unrelated with load, controlling is good；
4, described a kind of proportional hydraulic balanced valve, static locked time, use linear sealing, seal centering good；
5, described a kind of proportional hydraulic balanced valve, has simple in construction, easy to process, low cost, maintenanceability are good
Advantage.
Accompanying drawing explanation
Fig. 1 is a kind of proportional hydraulic balancing valve structure schematic diagram.
Fig. 2 is the structure chart of main valve plug.
Fig. 3 is the systematic schematic diagram of a kind of proportional hydraulic balanced valve band self-unloading.
Fig. 4 is a kind of proportional hydraulic balanced valve systematic schematic diagram without self-unloading.
Sequence number illustrates: 1, valve body (1), 2, spring I, 3, nonreturn valve core, 4, screw thread valve seat, 5, pilot valve, 6, inner elements of check valve,
7, spring II, 8, check valve, 9, plug, 10, main valve plug, 10-1, first step, 10-2, second step, 10-3, the 3rd step,
10-4, the 4th step, 10-5, the 5th step, 11, valve core spring seat, 12, spring III, 13, regulation spring base, 14, valve end cap,
15, back tightening nut, 16, regulation screw, 17, centering steel ball, 18, pilot valve spool, V, valve body the first hydraulic fluid port, C, valve body the second oil
Mouthful, T, valve body the 3rd hydraulic fluid port, X, valve body the 4th hydraulic fluid port, E, hydraulic jack rodless cavity hydraulic fluid port, D, hydraulic jack rod chamber hydraulic fluid port, A,
P, B, T three position four-way directional control valve hydraulic fluid port.
Detailed description of the invention
As it is shown in figure 1, the proportional hydraulic balanced valve of the present invention includes valve body (1), is arranged on valve body (1) main valve chamber one end
Pilot valve (5), be arranged on the valve end cap (14) of valve body (1) the main valve chamber other end, by back tightening nut (15) spinning on valve end cap
Regulation screw (16)；It is sequentially installed with main valve plug by pilot valve (5) one end to valve end cap (14) one end in described main valve chamber
(10), centering steel ball (17), valve core spring seat (11), spring III (12), regulation spring base (13), described regulation spring base (13)
It is positioned between spring III (12) and regulation screw (16)；Check valve (8), entering of check valve (8) it is provided with in described valve body (1)
Hydraulic fluid port communicates with valve body the first hydraulic fluid port (V), and the oil-out of check valve (8) is by the step groove of main valve plug (10) and valve body the second oil
Mouth (C) communicates；The valve pocket that the pilot valve spool (18) of described pilot valve (5) is formed with main valve plug (10) and valve body the first hydraulic fluid port (V) phase
Logical；The valve pocket formed between main valve plug (10) with regulation spring base (13) communicates with valve body the 3rd hydraulic fluid port (T).
The present invention along described main valve plug (10) axially arranged have first step (10-1), second step (10-2), the 3rd
Step (10-3), the 4th step (10-4), the 5th step (10-5), first step end is machined with the conical surface, main with valve body (1)
Valve pocket corresponding position cooperatively forms cone and seals, and second step is machined with throttle-flow groove, with valve body (1) main valve chamber relevant position
Place's cooperation realizes proportional flow regulation, and the 3rd step is through-flow flow channel, and the 4th step is machined with seal groove, the 4th step and the
The difference in areas of two steps is balanced valve self-unloading acting surface (seeing Fig. 2).The principle of the hydraulically balanced valve with self-unloading function is such as
Shown in Fig. 3；If the second step diameter of main valve plug and the 4th stepped diameters are identical, without self-unloading function, its hydro-cushion
The principle of valve is as shown in Figure 4.
Spring I (2), nonreturn valve core (3), screw thread valve seat (4), nonreturn valve core it is provided with in heretofore described pilot valve (5)
(3) having with radially damping and axially damping, described screw thread valve seat (4) and the 4th hydraulic fluid port (X) communicate, and are arranged on pilot valve
(5) realize two-way double damping, nonreturn valve core (3) and the conflict of spring I (2) one end make check valve with nonreturn valve core (3) cooperation in chamber
Core (3) resets and contacts sealing with screw thread valve seat (4), spring I (2) other end and the conflict of pilot valve (5) hole step；Described check valve
(8) include check valve valve body, in one-way valve body, have spring II (7), inner elements of check valve (6), described spring II (7) to be arranged on
Between inner elements of check valve (6) and check valve valve body, make to be formed between inner elements of check valve (6) with valve body (1) to seal to coordinate.
More specifically, the technique mouth end at the oil-out of check valve (8) is provided with plug (9)；Described centering steel ball (17)
Being positioned at main valve plug (10) right-hand member groove inconsistent with valve core spring seat (11), described valve core spring seat (11) is left with spring (12)
End is conflicted, and described spring III (12) right-hand member is conflicted with regulation spring base (13), and described regulation screw (16) passes through valve end cap
(14) conflict with regulation spring base (13) with back tightening nut (15).
The principle of the hydraulically balanced valve with self-unloading function is as shown in Figure 3；If the second step diameter of main valve plug and
Four stepped diameters are identical, and without self-unloading function, the principle of its hydraulically balanced valve is as shown in Figure 4.
The course of work of the present invention is as follows: as shown in accompanying drawing 3, Fig. 4, the first hydraulic fluid port (V) and three position four-way directional control valve hydraulic fluid port
(B) being connected, the second hydraulic fluid port (C) is connected with hydraulic jack rodless cavity hydraulic fluid port (E), and the 3rd hydraulic fluid port (T) is connected with hydraulic oil container, and the 4th
Hydraulic fluid port (X) is connected with three position four-way directional control valve hydraulic fluid port (A) with hydraulic jack rod chamber hydraulic fluid port (D), and load weight acts on hydraulic pressure
On cylinder piston rod.
When three position four-way directional control valve works in right position, three position four-way directional control valve hydraulic fluid port (P) and three position four-way directional control valve hydraulic fluid port
(A) connection, three position four-way directional control valve hydraulic fluid port (B) connects with three position four-way directional control valve hydraulic fluid port (T), and hydraulic oil is changed by 3-position 4-way
To valve oil mouth (P), three position four-way directional control valve hydraulic fluid port (A), enter the 4th hydraulic fluid port (X), hydraulic jack rod chamber hydraulic fluid port (D), pass through
Screw thread valve seat (4) hole, promotes nonreturn valve core (3) to move right, and hydraulic oil is by nonreturn valve core (3) radially damping hole and axially resistance
Buddhist nun hole, promotes pilot valve spool (18), and when main valve plug (10) left side thrust is more than spring (12) spring force, main valve plug (10) is to the right
Mobile, connect the first hydraulic fluid port (V) valve pocket and the second hydraulic fluid port (C) valve pocket, now support owing to the second hydraulic fluid port (C) bears hydraulic jack
The hydraulic fluid pressure that weight converts is more than the first hydraulic fluid port (V) pressure, and inner elements of check valve (6) is shifted onto valve body (1) by high pressure liquid force feed
On oil channel sealing face, check valve (8) is closed, and hydraulic oil can only enter the first hydraulic fluid port by the throttle-flow groove of main valve plug (10)
(V), then hydraulic oil container, the 4th hydraulic fluid port (X) are returned by three position four-way directional control valve hydraulic fluid port (B), three position four-way directional control valve hydraulic fluid port (T)
The thrust to pilot valve spool (18) that place's hydraulic oil produces produces the thrust to main valve plug (10) with the second hydraulic fluid port (C) pressure oil
With, during equal to spring (12) spring force, main valve plug (10) is for stable state.
When three position four-way directional control valve works in left position, three position four-way directional control valve hydraulic fluid port (P) and three position four-way directional control valve hydraulic fluid port
(B) connection, three position four-way directional control valve hydraulic fluid port (A) connects with three position four-way directional control valve hydraulic fluid port (T), and hydraulic oil is changed by 3-position 4-way
To valve oil mouth (P), three position four-way directional control valve hydraulic fluid port (B), enter the first hydraulic fluid port (V) and promote inner elements of check valve (6), unidirectional when promoting
When valve core (6) power upwards applies downward power more than hydraulic jack support weight to inner elements of check valve (6), inner elements of check valve
(6) moving up, check valve (8) is opened, and connects the first hydraulic fluid port (V) valve pocket and the second hydraulic fluid port (C) valve pocket, and hydraulic oil passes through hydraulic pressure
Oil cylinder rodless cavity hydraulic fluid port (E) enters and promotes hydraulic cylinder piston rod to stretch out, and hydraulic jack rod chamber hydraulic fluid port (D) and 3-position 4-way change
To valve oil mouth (T) identical oil return, weight is promoted to rise.
The market prospects of the present invention:
At present, the fast development maximized along with engineering machinery, such as: the core enforcement divisions such as high-power elevator, a heavy oil cylinder
Part have also been obtained fast lifting, possesses fast and efficient construction and fine work to adapt to multi-state demand, equipment or product needed
Industry pattern (or function), the balanced valve matching elevator or oil cylinder is it is also proposed that existing corresponding requirement, and current balanced valve is logical
There is a lot of defect in stream ability and speed governing stability aspect, the present invention can effectively solve the problem that problems.
Claims (2)
1. a proportional hydraulic balanced valve, it is characterised in that: described proportional hydraulic balanced valve includes valve body (1), is arranged on valve
The pilot valve (5) of body (1) main valve chamber one end, it is arranged on the valve end cap (14) of valve body (1) the main valve chamber other end, passes through back tightening nut
(15) spinning regulation screw (16) on valve end cap；By pilot valve (5) one end to valve end cap (14) one end in described main valve chamber
It is sequentially installed with main valve plug (10), centering steel ball (17), valve core spring seat (11), spring III (12), regulation spring base (13), institute
State regulation spring base (13) to be positioned between spring III (12) and regulation screw (16)；It is provided with check valve in described valve body (1)
(8), the oil-in of check valve (8) communicates with valve body the first hydraulic fluid port (V), and the oil-out of check valve (8) is by main valve plug (10)
Step groove communicates with valve body (1) second hydraulic fluid port (C)；The valve that the pilot valve spool (18) of described pilot valve (5) and main valve plug (10) are formed
Chamber communicates with valve body the first hydraulic fluid port (V)；The valve pocket formed between main valve plug (10) and regulation spring base (13) and valve body the 3rd oil
Mouth (T) communicates；Along main valve plug (10) axially arranged have first step (10-1), second step (10-2), the 3rd step (10-3),
4th step (10-4), the 5th step (10-5), first step end is machined with the conical surface, with valve body (1) main valve chamber corresponding positions
The place of putting cooperatively forms cone and seals, and second step is machined with throttle-flow groove, coordinates realization with valve body (1) main valve chamber corresponding position
Proportional flow regulates, and the 3rd step is through-flow flow channel, and the 4th step is machined with seal groove, the 4th step and the face of second step
Product moment is balanced valve self-unloading acting surface；Spring I (2), nonreturn valve core (3), screw thread valve seat (4) it is provided with in described pilot valve (5),
Nonreturn valve core (3) has with radially damping and axially damping, and described screw thread valve seat (4) and valve body the 4th hydraulic fluid port (X) communicate,
Realizing two-way pair damp with nonreturn valve core (3) cooperation in being arranged on pilot valve (5) chamber, nonreturn valve core (3) and spring I (2) one end are supported
Touch and make nonreturn valve core (3) reset contact sealing, spring I (2) other end and the conflict of pilot valve (5) hole step with screw thread valve seat (4).
Proportional hydraulic balanced valve the most according to claim 1, it is characterised in that: described check valve (8) includes check valve
Valve body, has spring II (7), inner elements of check valve (6), described spring II (7) to be arranged on inner elements of check valve (6) in one-way valve body
And between check valve valve body, make to be formed between inner elements of check valve (6) with valve body (1) to seal to coordinate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510092571.7A CN104653539B (en) | 2015-03-02 | 2015-03-02 | A kind of proportional hydraulic balanced valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510092571.7A CN104653539B (en) | 2015-03-02 | 2015-03-02 | A kind of proportional hydraulic balanced valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104653539A CN104653539A (en) | 2015-05-27 |
| CN104653539B true CN104653539B (en) | 2016-08-24 |
Family
ID=53245049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510092571.7A Active CN104653539B (en) | 2015-03-02 | 2015-03-02 | A kind of proportional hydraulic balanced valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104653539B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106044568A (en) * | 2016-07-11 | 2016-10-26 | 润琛液压机械南通有限公司 | Balance valve of ship crane |
| CN108930682B (en) * | 2018-08-22 | 2020-06-26 | 江苏金晟元特种阀门股份有限公司 | Balance valve with improved structure |
| CN109538568B (en) * | 2019-01-16 | 2023-08-04 | 安徽江淮专用汽车有限公司 | Buffer protection efficiency improving system of compression garbage truck |
| CN111306131B (en) * | 2020-04-02 | 2024-07-26 | 浙江树人学院（浙江树人大学） | Electric cylinder hydraulic valve |
| CN111322455B (en) * | 2020-04-08 | 2022-07-22 | 徐州阿马凯液压技术有限公司 | Multifunctional compensation valve rod structure |
| CN112762043B (en) * | 2021-03-08 | 2024-07-23 | 太重集团榆次液压工业(济南)有限公司 | Flow self-adjusting stable hydraulic valve with pressure protection function for vehicle |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5936152B2 (en) * | 1978-09-12 | 1984-09-01 | 株式会社ユニツク | hydraulic control valve |
| EP0883753B1 (en) * | 1996-02-28 | 2002-04-17 | Bucher Hydraulics AG | Load-holding brake valve |
| CN1170067C (en) * | 2001-12-07 | 2004-10-06 | 卢永松 | Hydraulic balancing valve |
| CN101893010B (en) * | 2009-05-21 | 2013-02-13 | 上海立新液压有限公司 | Hydraulic balanced valve |
| CN202732526U (en) * | 2012-08-20 | 2013-02-13 | 宁波市博尔法液压有限公司 | Combined hydraulic balance valve |
| CN202790565U (en) * | 2012-09-18 | 2013-03-13 | 中联重科股份有限公司 | Balance valve |
| CN103062147B (en) * | 2013-01-24 | 2015-06-03 | 中联重科股份有限公司 | Hydraulic control throttle valve, balance valve, hydraulic system for controlling winch and engineering machinery |
| CN103343829B (en) * | 2013-07-24 | 2015-06-03 | 南京工业大学 | Balance valve and test system thereof |
| CN103775438B (en) * | 2013-12-31 | 2016-09-14 | 江苏南铸科技股份有限公司 | Overload protection valve and the overload valve containing overload protection valve |
| CN204493329U (en) * | 2015-03-02 | 2015-07-22 | 郑州宇通重工有限公司 | A kind of proportional hydraulic equilibrium valve |
-
2015
- 2015-03-02 CN CN201510092571.7A patent/CN104653539B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104653539A (en) | 2015-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104653539B (en) | A kind of proportional hydraulic balanced valve | |
| CN204493329U (en) | A kind of proportional hydraulic equilibrium valve | |
| CN204186666U (en) | A kind of plug-in type load holding valve and hydraulic load retentive control system | |
| CN100441885C (en) | Hydraulic balance valve capable of automatically adapting load change | |
| CN104196803B (en) | A kind of multi-functional screw-in cartridge valve for heavy tractor electricity liquid lifter | |
| CN103470815B (en) | balance valve | |
| CN102628459B (en) | Multi-oil-cylinder synchronous control system and engineering vehicle | |
| CN105090600B (en) | A kind of electricity liquid ratio relief valve | |
| CN204226320U (en) | Equilibrium valve and truck crane | |
| CN104481948B (en) | Stabilized pressure flow control valve and load sensitive analog valve | |
| CN102128284A (en) | Pressure-reduction type balance hydraulic lock | |
| CN108825577B (en) | Balance valve with variable hydraulic control ratio | |
| CN105971956B (en) | A kind of pilot-actuated valve | |
| CN104019085B (en) | Leveling hydraulic system and engineering machinery | |
| CN104343755A (en) | Hydraulically controlled slave valve and load-sensitive simulation valve | |
| CN106382269A (en) | Combination valve with speed governing, reversing and overflow functions | |
| CN202023780U (en) | Pressure-reducing type balance hydraulic lock | |
| CN203847462U (en) | Multi-flow control valve, chassis support leg hydraulic control system and crane | |
| CN104500475B (en) | A kind of machinery balanced valve with articulated boom | |
| CN205277981U (en) | Hydro -cylinder under hydraulic lifting platform's of lifting | |
| CN103867511A (en) | Flow control valve | |
| CN103591349A (en) | High-flow intelligent warning type safety valve | |
| CN104653536B (en) | A kind of load-sensitive valve | |
| CN203627377U (en) | Hydraulic valve device | |
| CN203362671U (en) | Double-way priority valve group |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |