CN103851225A - Rotary multi-way reversing valve - Google Patents

Rotary multi-way reversing valve Download PDF

Info

Publication number
CN103851225A
CN103851225A CN201310493220.8A CN201310493220A CN103851225A CN 103851225 A CN103851225 A CN 103851225A CN 201310493220 A CN201310493220 A CN 201310493220A CN 103851225 A CN103851225 A CN 103851225A
Authority
CN
China
Prior art keywords
spool
valve body
valve
selector valve
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.)
Pending
Application number
CN201310493220.8A
Other languages
Chinese (zh)
Inventor
宋久林
李�权
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201310493220.8A priority Critical patent/CN103851225A/en
Publication of CN103851225A publication Critical patent/CN103851225A/en
Pending legal-status Critical Current

Links

Images

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multiple-Way Valves (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)

Abstract

The invention discloses a rotary multi-way reversing valve. The rotary multi-way reversing valve comprises a valve body, a valve core and an end cover, wherein a valve core hole is formed in the valve body; the end cover is positioned on the end part of the valve core hole of the valve body and is fixed to the valve body; a first fluid outlet/inlet passage, a second fluid outlet/inlet passage and one or more pairs of fluid working passages are formed in the valve body and the end cover; the valve core with a duct and an opening is positioned in the valve core hole of the valve body and can rotate around the axial line of the valve core. The rotary multi-way reversing valve is characterized in that the valve core has a rotating position in the valve body and can communicate the first fluid outlet/inlet passage, the second fluid outlet/inlet passage and the selected pair of fluid working passages in parallel or in an intersecting way. The reversing valve has the advantage that switching, reversing and multi-way switching functions are integrated, has the characteristics of large flow amount, high pressure resistance, low pressure loss, low inner leakage and the like, and has wide application prospect in a large-flow high-pressure system.

Description

The many logical selector valves of a kind of rotation
Technical field
The present invention relates to a kind of fluid diverter valve, be specifically related to the many logical selector valves of a kind of rotation.
Background technique
In circulating pressure fluid system, every road fluid comes/returns all to need 2 passages to carry; The control of fluid in passage is carried out as ON/OFF, commutation and the switching between multiple pipelines all need 2 passages simultaneously.The most frequently used method of people is installed in parallel 4 logical selector valves (as 34 electric change valves) with regard to being used in the joint of primary input Yu Mei road Twin channel output pipeline, any road need to just open can also controlling party to, i.e. simple in structure, application also very flexibly.Selector valve is generally all sliding valve style at present, and due to structure, guiding valve and valve body are Spielpassung, and valve inner passage is very limited, and spool stroke and open communication are smaller, thereby fluid is through wherein all having many flows and the pressure loss; Especially in the system of large flow, high pressure, it causes the aobvious especially tool of loss of system capacity.For improving system effectiveness, in Mass flow system, people often utilize multiple two-way plug-in valves logical relation each other to realize the function such as switch, commutation and switching of fluid.It is large that two-way plug-in valve has through-current capacity, and the pressure loss is little, also can realize the advantages such as zero leakage; But not only switching speed ratio is very fast for Twoway valves, can produce larger impact to system, and Twoway valves piece need to customize according to the concrete requirement of system, use is very targeted, versatility is not strong, cost is also higher, and its energy loss of system is still larger etc. not enough under heavy traffic condition.Closed system is owing to there is no control valve in pipeline, and transmission efficiency is higher and become the developing direction of big-flow high-pressure system than open system; In this system, due to direction and size by pump control fluid, thereby each pump can only be controlled a set of actuator; In the time not having multiple actuators and inter-working time overlapping again, if there is a kind of valve that can make the main Twin channel of enclosed pump switch in many actuators pipeline, it can make an enclosed pump be easy to many actuators to drive respectively, thereby the demand of minimizing system to pump, this is very beneficial for reducing costs, raises the efficiency, reduces energy consumption.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, a kind of selector valve is provided, and it has that volume is little, through-current capacity is large, internal leakage is few, the pressure loss is very little and can realize switch, commutation, the switching function that the defeated entry/exit fluid of 1 tunnel Twin channel is realized between 1 pair or multipair passage.
For solving the problems of the technologies described above, technological scheme of the present invention is: the many logical selector valves of a kind of rotation, it comprises valve body, spool and end cap, described valve body has spool bore, described end cap is positioned at the spool bore end of valve body and is fixed on valve body, described valve body and described end cap are provided with fluid first, the second in/out passage and a pair of or multipair fluid operating passage, the spool with duct and opening is positioned at the spool bore of described valve body and can rotates around Pivot Point Center line, it is characterized in that, described spool has rotational position in described valve body can be by fluid first, the second in/out passage and selected a pair of fluid operating passage are realized parallel or intersect connection between two.
As preferably, described connection is carried out on flow face, and described flow face is surface of revolution, specifically comprises cylndrical surface or plane or conical surface or sphere.
As preferably, on described spool, carry out described 2 openings generals that are communicated with service aisle and keep being communicated with described first, second in/out passage respectively.
As preferably, on described spool, carry out described 2 openings that are communicated with service aisle and centered by described spool shaft axis, be mutually 180 degree layouts.
As preferably, on described valve body or described end cap, the every pair of described fluid operating passage and described spool carry out the described opening being communicated with and centered by described spool shaft axis, are mutually 180 degree and arrange.
As preferably, described selector valve further comprises the bearing that can support described valve core movement.
As preferably, described selector valve further comprises the device for driving valve body that can drive described spool to move in described valve body.
As preferably, described selector valve further includes rotating sealing device.
As preferably, described spool further includes outlet sealing device.
Compared with prior art, the invention has the advantages that:
1. can realize 1 tunnel Twin channel fluid commutates and switching function in 1 pair or multipair service aisle;
2. through-current capacity is large, the pressure loss is very little;
3. internal leakage is very little is even zero;
4. valve body need not be cast, simple in structure, and cost is low;
5. driving mode is flexible, and Function Extension is convenient.
Accompanying drawing explanation
Fig. 1 a is that the logical rotary reversing valve of the present invention a kind of 4 is communicated with schematic diagram.
Fig. 1 b is that the logical rotary reversing valve of the present invention a kind of 6 is communicated with schematic diagram.
Fig. 1 c is that the logical rotary reversing valve of the present invention a kind of 8 is communicated with schematic diagram.
Fig. 2 a is the main sectional view of first embodiment of the invention.
Fig. 2 b is the logical selector valve K-K sectional view of first embodiment of the invention 4.
Fig. 2 c is the logical selector valve K-K sectional view of first embodiment of the invention 6.
Fig. 2 d is the logical selector valve K-K sectional view of first embodiment of the invention 8.
Fig. 3 a is the main sectional view of second embodiment of the invention.
Fig. 3 b is that the logical selector valve K of second embodiment of the invention 4 is to view.
Fig. 3 c is that the logical selector valve K of second embodiment of the invention 6 is to view
embodiment
The present invention is further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 a is the connection schematic diagram of the present invention's a kind of 4 logical rotary reversing valves, its Median Function is meta cut-off, owing to only having a pair of service aisle, known by schematic diagram, described spool has rotational position and first, second defeated entry/exit passage (A/B) of fluid and service aisle (C/D) can be realized parallelly or intersects connection between two, can realize C-A/D-B or D-A/C-B connection.Fig. 1 b is that the logical rotary reversing valve of the present invention a kind of 6 is communicated with schematic diagram, and it has 2 pairs of service aisles, and Median Function is meta cut-off; As shown in the figure, described spool has rotational position and first, second defeated entry/exit passage (A/B) of fluid and selected a pair of service aisle (C/D or E/F) can be realized parallelly or intersects connection between two, can realize A-C/B-D or A-D/B-C or A-E/B-F or A-F/B-E connection.Fig. 1 c is that the logical rotary reversing valve of the present invention a kind of 8 is communicated with schematic diagram, it has 3 pairs of service aisles, as shown in the figure, described spool has rotational position and first, second defeated entry/exit passage (A/B) of fluid and selected a pair of service aisle (C/D or E/F or G/H) can be realized parallelly or intersects connection between two, can realize A-C/B-D or A-D/B-C or A-E/B-F or A-F/B-E or A-G/B-H or A-H/B-G connection.In the time having more multipair service aisle, it is communicated with principle and so analogizes.Can find out by principle schematic; in the time of multipair output channel; spool passes through possibly other commutation position in the process that reaches desired location; for avoiding in the time commutating, other passage being impacted, the protective measure that first, second defeated entry/exit passage (A/B) does not preferably have pressure or takes other before commutation.
Embodiment 1, as shown in Fig. 2 a, 2b, 2c, 2d.In figure: 1 is spool, 2 is valve body, and 3 is end cap, and 4 is device for driving valve body, and 5 is rotating seal, and 6 is outlet sealing device, and 7 is bearing; A/B is first, second input channel of fluid; C/D, E/F, G/H are 3 pairs of service aisles.As shown in the figure, in the present embodiment, cylindrical spool is installed in the cylindrical spool hole of valve body, and spool carried out with being communicated with on the cylindrical fit face of spool and spool bore of service aisle, thereby the flow face of the present embodiment selector valve is cylndrical surface.As shown in Figure 2 a, be provided with duct and the opening for being communicated with on spool (1), wherein a2/b2 is the opening being communicated with service aisle respectively on spool, and it two is on the flow face that 180 degree are arranged in spool centered by spool shaft axis; A1/b1 is the opening being communicated with first, second defeated entry/exit passage A/B respectively on spool, and Ta/Tb is respectively the duct, inside that valve core opening a1 and a2, b1 and b2 are interconnected.In the present embodiment, a1/b1 is annular diversion trench, thereby can make spool open communication a2/b2 passing hole channel Ta/Tb keep being communicated with first, second input channel of fluid A/B respectively; Certainly the guiding gutter of opening a1/b1 also can be opened on valve body or be the opening of other types.In Fig. 2 b, 2c, 2d, c1/d1, e1/f1, h1/g1 are respectively each opening that service aisle (C/D, E/F, G/H) is communicated with spool, can find out from figure, every pair of 2 open communication corresponding to service aisle are mutually 180 degree and arrange centered by Spool rotating shaft axis.Thereby in the time of Spool rotating, a2/b2 just can be in sequence realizes and being interconnected with c1/d1 or e1/f1 or h1/g1 respectively; After connection, spool again Rotate 180 degree is that the replaceable order being interconnected realizes commutation.This that is to say spool have rotational position can by first, second defeated entry/exit passage of fluid and arbitrarily selected a pair of service aisle realize parallel or intersect connection between two.Wherein, Fig. 2 b is C/D with 1 pair of output channel, and it is specifically communicated with schematic diagram and is equal to Fig. 1 a; Fig. 2 c is C/D, E/F with 2 pairs of output channels, and it is specifically communicated with schematic diagram and is equal to Fig. 1 b; Fig. 2 c is C/D, E/F, G/H with 3 pairs of output channels, and it is specifically communicated with schematic diagram and is equal to Fig. 1 c.Also illustrate that accordingly it is feasible that selector valve of the present invention has more multipair service aisle.In figure, rotating seal (5) is arranged in the two ends of each opening between spool and valve body vertically, and it can eliminate leakage axial between spool and spool bore; Outlet sealing device (6) is arranged on spool open communication a2/b2 position, and it can reduce the leakage between open communication on flow face while connection; Spool (1) is bearing in the spool bore of valve body (2) by bearing (7), thereby can make the less power of device for driving valve body (4) be communicated with between position and accurately move at each with regard to actuatable valve core; Device for driving valve body (4) specifically comprises manually, reducing motor, liquid hole motor, oil cylinder etc.
Embodiment 2, as shown in Fig. 3 a, Fig. 3 b, Fig. 3 c.In figure, 1 is spool, and 2 is valve body, and 3 is end cap, and 4 is device for driving valve body, and 5 is rotating seal, and 6 is outlet sealing device, and 7 is bearing; A/B is the opening of first, second input channel of fluid on valve body; C/D, E/F are 2 pairs of service aisles, and it is upper that they are all positioned at end cap (3), and S1 is spool flow face; S2 is end cap flow face.The present embodiment principle is the same with the first embodiment, and difference is in the present embodiment, and spool and each opening that service aisle is communicated with to use are all positioned in plane, and the flow face (S1) of spool and end cap flow face (S2) are plane.Can find out from figure, on flow face, the opening that spool is communicated with service aisle is 180 degree and arranges centered by Spool rotating shaft axis; And each to 2 of service aisle open communication also centered by spool shaft axis, be 180 degree arrange.Therefore in the time that S1 face and S2 face closely cooperate, the present embodiment is the same with the first embodiment, and spool has rotational position and first, second in/out passage of fluid and selected a pair of fluid operating passage can be realized parallel or intersect connection between two in described valve body.This example selector valve service aisle also can be 1 pair, and 2 pairs or more multipair, wherein Fig. 1 b has the K of 1 pair of service aisle to view, and Fig. 1 c is for having 2 couples of service aisle K to view.Because the open communication of this example rotary reversing valve spool is positioned at the axle head of spool, thereby fluid will produce end thrust to spool at open communication place, for this reason in Fig. 3 a, the axial force of utilizing bearing (7) to bear spool, thus can reduce the resistance to motion of spool.The same with the first example, rotary seal (5) can drop to minimum along the leakage of spool by first, second input channel of fluid; Outlet sealing device (6) can make between open communication to keep to closely cooperate and reduce the leakage at open communication place; Device for driving valve body (4) can comprise manually, reducing motor, liquid hole motor, oil cylinder etc.
Be introduced known using cylndrical surface and plane as flow face as the first and second preferential embodiments by above-mentioned selector valve, the commutation processes of the rotary many logical selector valves of the present invention are exactly to make spool open communication and each process that service aisle open communication is mutually contacted, intersects, overlapped on flow face by the rotation of spool, therefore arbitrarily surface of revolution all can be used as the present invention rotate more than the flow faces of logical selector valves.It can be not only the plane of rotation that cylndrical surface and plane also comprise other type such as conical surface, sphere.In handshaking procedures, the coincidence district of spool open communication and service aisle open communication is the connection area of selector valve fluid namely, and it constantly increases the angle of swing along with spool gradually or reduce gradually; This angle of swing, speed that is to say size, form or regulating spool by improving open communication just can effectively be controlled fluid flow size, change curve and speed in handshaking procedures.Thereby rotary reversing valve of the present invention not only reversing impact is little, and by controlling angle and the speed of Spool rotating, carry out intellectuality control to being communicated with area, thereby realize the better proportional flow of selector valve or pressure control, further expand using scope of the present invention.
The improvement that the present invention carries out mainly for high pressure, large flow multi-pass fluid selector valve, the foregoing is only preferred embodiment of the present invention, non-ly therefore limit to the scope of the claims of the present invention, therefore simple and easy variation and the equivalent transformation of such as doing with specification of the present invention and diagramatic content, all should be contained in the scope of the claims of the present invention.

Claims (9)

1. the how logical selector valve of rotation, it comprises valve body, spool and end cap, described valve body has spool bore, described end cap is positioned at the spool bore end of valve body and is fixed on valve body, described valve body and described end cap are provided with fluid first, the second in/out passage and a pair of or multipair fluid operating passage, the spool with duct and opening is positioned at the spool bore of described valve body and can rotates around Pivot Point Center line, it is characterized in that, described spool has rotational position in described valve body can be by fluid first, the second in/out passage and selected a pair of fluid operating passage are realized parallel or intersect connection between two.
2. the how logical selector valve of rotation according to claim 1, is characterized in that, described connection is carried out on flow face, and described flow face is surface of revolution, specifically comprises cylndrical surface or plane or conical surface or sphere.
3. the how logical selector valve of rotation according to claim 1, is characterized in that, on described spool, realizing described 2 openings that are communicated with described service aisle will keep being communicated with described first, second in/out passage respectively.
4. the how logical selector valve of rotation according to claim 1, is characterized in that, realizes described 2 openings that are communicated with centered by described spool shaft axis, be mutually 180 degree layouts on described spool with described service aisle.
5. the how logical selector valve of rotation according to claim 1, is characterized in that, on described valve body or end cap, every pair of described fluid operating passage carries out the described opening being communicated with described spool and centered by described spool shaft axis, is mutually 180 degree layouts.
6. the how logical selector valve of rotation according to claim 1, is characterized in that, described selector valve further comprises the bearing that can support described valve core movement.
7. the how logical selector valve of rotation according to claim 1, is characterized in that, described selector valve further comprises the device for driving valve body that can drive described spool to move in described valve body.
8. the how logical selector valve of rotation according to claim 1, is characterized in that, described selector valve further includes rotating sealing device.
9. the how logical selector valve of rotation according to claim 1, is characterized in that, described spool further includes outlet sealing device.
CN201310493220.8A 2012-11-01 2013-10-21 Rotary multi-way reversing valve Pending CN103851225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310493220.8A CN103851225A (en) 2012-11-01 2013-10-21 Rotary multi-way reversing valve

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201210430277.9 2012-11-01
CN201210430277.9A CN103791120A (en) 2012-11-01 2012-11-01 Rotary multi-way reversing valve
CN201310493220.8A CN103851225A (en) 2012-11-01 2013-10-21 Rotary multi-way reversing valve

Publications (1)

Publication Number Publication Date
CN103851225A true CN103851225A (en) 2014-06-11

Family

ID=50667055

Family Applications (2)

Application Number Title Priority Date Filing Date
CN201210430277.9A Pending CN103791120A (en) 2012-11-01 2012-11-01 Rotary multi-way reversing valve
CN201310493220.8A Pending CN103851225A (en) 2012-11-01 2013-10-21 Rotary multi-way reversing valve

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN201210430277.9A Pending CN103791120A (en) 2012-11-01 2012-11-01 Rotary multi-way reversing valve

Country Status (1)

Country Link
CN (2) CN103791120A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104747773A (en) * 2015-03-16 2015-07-01 西安交通大学 Flow-adjustable unilateral plate-type three-position four-way rotary valve
CN106246627A (en) * 2016-08-20 2016-12-21 黎明液压有限公司 A kind of rotary control type hydraulicdirectional control valve
CN106351614A (en) * 2016-10-19 2017-01-25 西南石油大学 Preferred pipe column water drainage gas production simulation device and experiment method
CN107420364A (en) * 2017-05-07 2017-12-01 湖南旗精密机械有限公司 Rotary reversing valve
CN107642624A (en) * 2017-08-14 2018-01-30 昆明理工大学 A kind of multi-way reversing rotary valve and its multi-cylinder control method
CN109764155A (en) * 2019-01-25 2019-05-17 厦门福美科技有限公司 Dispensing valve and fluid treating device
CN110529628A (en) * 2019-07-23 2019-12-03 上海蔚来汽车有限公司 A kind of multiple-way valve, heat management system and electric car

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105284554B (en) * 2015-10-26 2018-02-02 大禹节水（天津）有限公司 Two-flow flow straightener
CN107202190B (en) * 2017-06-15 2023-03-14 广东机电职业技术学院 Rotary type flow automatic control device
CN107355564A (en) * 2017-07-10 2017-11-17 成都赛普瑞兴科技有限公司 A kind of rotary valve and its component
CN107764362B (en) * 2017-11-27 2024-08-27 安徽江天云控技术股份有限公司 Piezoresistive high-precision oil quantity sensor for automobiles and engineering machinery
CN108662196A (en) * 2018-07-20 2018-10-16 广东格匠实业有限公司 A kind of steam generating device of back flush
CN113027845B (en) * 2021-03-15 2022-02-18 同济大学 Synchronous-acting shaft flow distribution proportional reversing multi-way valve
CN113153850A (en) * 2021-03-23 2021-07-23 同济大学 Shaft flow distribution high-frequency switch reversing valve

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104747773A (en) * 2015-03-16 2015-07-01 西安交通大学 Flow-adjustable unilateral plate-type three-position four-way rotary valve
CN104747773B (en) * 2015-03-16 2017-02-22 西安交通大学 Flow-adjustable unilateral plate-type three-position four-way rotary valve
CN106246627A (en) * 2016-08-20 2016-12-21 黎明液压有限公司 A kind of rotary control type hydraulicdirectional control valve
CN106246627B (en) * 2016-08-20 2017-10-27 黎明液压有限公司 A kind of rotary control type hydraulicdirectional control valve
CN106351614A (en) * 2016-10-19 2017-01-25 西南石油大学 Preferred pipe column water drainage gas production simulation device and experiment method
CN107420364A (en) * 2017-05-07 2017-12-01 湖南旗精密机械有限公司 Rotary reversing valve
CN107642624A (en) * 2017-08-14 2018-01-30 昆明理工大学 A kind of multi-way reversing rotary valve and its multi-cylinder control method
CN107642624B (en) * 2017-08-14 2019-04-12 昆明理工大学 A kind of multi-way reversing rotary valve and its multi-cylinder control method
CN109764155A (en) * 2019-01-25 2019-05-17 厦门福美科技有限公司 Dispensing valve and fluid treating device
CN109764155B (en) * 2019-01-25 2024-08-02 厦门福美科技有限公司 Fluid dispensing valve and fluid treatment device
CN110529628A (en) * 2019-07-23 2019-12-03 上海蔚来汽车有限公司 A kind of multiple-way valve, heat management system and electric car
CN110529628B (en) * 2019-07-23 2024-04-02 上海蔚来汽车有限公司 Multi-way valve, thermal management system and electric automobile

Also Published As

Publication number Publication date
CN103791120A (en) 2014-05-14

Similar Documents

Publication Publication Date Title
CN103851225A (en) Rotary multi-way reversing valve
CN203115181U (en) Rotating type multichannel reversing valve
CN201651418U (en) Rotary type two-position multichannel reversing valve
CN202091555U (en) Slide-valve-type two-position and three-way reversing valve
CN104373630A (en) Rotary proportional reversing valve
CN103899791B (en) A kind of alternating current servo motor direct drives formula off-load proportional flow rotary valve
CN101324279B (en) Rotary type fluid-distributing valve
CN104421462A (en) Rotating high pressure and low pressure switching valve
KR0121557B1 (en) Hydraulic power steering device
CN203532863U (en) Rotary high-low pressure switching valve
CN102400968A (en) Hydraulic valve, hydraulic system and concrete pumping equipment
CN201836004U (en) Hydraulic system
CN102797722B (en) Hydraulic reversing valve with axially moving and rotating functions
CN202108798U (en) Hydraulic rotary valve and engineering machinery
CN105042066B (en) Manual three six logical reversing rotary valves and hydraulic automatic speed variator
CN204099655U (en) A kind of the concrete pump set and diverter valve
CN101963243B (en) Micro hydraulic control valve device
CN102374310B (en) High-low pressure conversion device and pumping system
CN205937281U (en) Spin control formula hydraulic directional control valve
CN202418722U (en) Pneumatic directional control valve
CN111980978B (en) Torque control hydraulic system based on push-pull speed of power head
CN104204546B (en) The control valve device of power digger
CN212959861U (en) Four-way-diameter electromagnetic manual reversing valve
CN202449055U (en) Full-hydraulic steering control system and rough-terrain crane
CN210218786U (en) Change-over valve structure that can switch between cross and tee bend

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20140611