CN105972255B - A kind of revolving high-speed switch valve - Google Patents
A kind of revolving high-speed switch valve Download PDFInfo
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- CN105972255B CN105972255B CN201610336836.8A CN201610336836A CN105972255B CN 105972255 B CN105972255 B CN 105972255B CN 201610336836 A CN201610336836 A CN 201610336836A CN 105972255 B CN105972255 B CN 105972255B
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Classifications
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- 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
- F16K11/085—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 with cylindrical plug
- F16K11/0856—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 with cylindrical plug having all the connecting conduits situated in more than one plane perpendicular to the axis of the plug
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Multiple-Way Valves (AREA)
- Sliding Valves (AREA)
Abstract
A kind of high-speed rotary switch valve, belong to HYDRAULIC CONTROL SYSTEM part, it includes motor, valve body, PWM valve core, rotary spool, valve pocket, it is characterized in that PWM valve core, rotary spool and valve pocket are disposed coaxially in valve body, PWM valve core, rotary spool, valve pocket are provided with corresponding oil groove, and pressure oil is introduced oil-out and oil inlet by oil groove respectively；Motor controls the dutycycle of high-speed switch valve by adjusting the relative position of PWM valve core and valve pocket, and motor driving rotary spool realizes that pressure oil switches in the high frequency of oil-out and oil return opening.The present invention adjusts dutycycle by changing the relative position of PWM valve core and valve pocket, and rotary spool often rotates can realize valve in one week n times and opens and close, and reduces the noise of high-speed switch valve, improve the high-speed switch valve life-span, it is and simple in construction, it is easy to accomplish, suitable for hydraulic control system.
Description
Technical field
The invention belongs to field of hydraulic control, and in particular to a kind of high-speed rotary switch valve.
Background technology
Digital hydraulic technology does not need A/D or D/A conversions to realize the signal transmission between hydraulic valve and controller, tool
There are high fault-tolerance and rapidity, accurate control, efficiency high.High-speed switch valve is as numeral most widely used at present
Valve, by changing the Duty ratio control opening/closing time of pwm signal, so as to realize the control of flow and pressure.Due to speed-sensitive switch
The problem of valve is constantly in HF switch state, and resulting noise and compression shock problem is always urgent need to resolve；Simultaneously
Limited and requirement of the high-speed switch valve to HF switch by electromechanical conversion equipment, existing electromagnetism high-speed switch valve
Through-current capability is smaller.
A kind of patent " energy-saving high-speed switch valve for hydraulic transmission " Publication No. CN102121486A proposes a kind of energy-conservation
High-speed switch valve.The valve element of the high-speed switch valve is divided into three parts, and center section is PWM sections, and both ends are outlet section, and valve element is revolving
During turning, hydraulic oil can mutually be changed between load hydraulic fluid port and oil return opening；By controlling valve element relative to oil inlet nozzle
Axial displacement, 0 %-100 % dutycycle can be obtained.Therefore the valve can realize general height by the rotary motion of valve element
The function of fast switch valve, the noise of high-speed switch valve is reduced, improve the through-current capability and service life of high-speed switch valve, solved
The contradiction determined between high-speed switch valve big flow and high frequency.But the axial displacement control of the valve element needs extra hydraulic pump and electricity
Machine, add the volume and control difficulty of valve.
To solve the problems, such as the contradiction of high-speed switch valve noise and compression shock, high frequency response and low discharge, this just needs one
The revolving valve core structure of kind, the opening and closing function of high-speed switch valve can be realized during Spool rotating.
The content of the invention
It is an object of the invention to provide a kind of revolving speed-sensitive switch valve arrangement, for solving high-speed switch valve in height
Contradiction in frequency opening-closing process between caused noise problem, the high frequency response limited by electromechanical conversion equipment and big flow,
Improve the service life of high-speed switch valve.
Technical scheme：A kind of high-speed rotary switch valve, including motor, bonnet, thrust bearing, valve body, PWM
Valve element, rotary spool, valve pocket, it is characterized in that PWM valve core, rotary spool and valve pocket are disposed coaxially in valve body, rotary spool cloth
Put between PWM valve core and valve pocket；Motor, bonnet, thrust bearing and PWM valve core are coaxially arranged, motor, bonnet, thrust bearing
And rotary spool is coaxially arranged.
In above-mentioned technical scheme, the PWM valve core is provided with some first oil groove P1, the second oil groove P2 and the 3rd oil groove
P3, the second oil groove P2 are arranged between the first oil groove P1 and the 3rd oil groove P3, and the second oil groove P2 notch area is more than the first oil
Groove P1 notch area and the notch area for being more than the 3rd oil groove P3, all second oil groove P2 of PWM valve core central angle sum are big
In 210 °, the first oil groove P1 and the 3rd oil groove P3 number are equal, and the first oil groove P1 is equal with the 3rd oil groove P3 central angle；The
One oil groove P1 connects with oil-out A, and the second oil groove P2 connects with oil inlet P, and the 3rd oil groove P3 connects with oil return inlet T；Adjacent
Equidistant between one oil groove P1, equidistant between adjacent second oil groove P2, adjacent 3rd oil groove P3 is equidistant.
The rotary spool is provided with some 4th oil groove P4, the 5th oil groove P5 and the 6th oil groove P6, the 4th oil groove P4 and
Six oil groove P6 are arranged symmetrically in the 5th oil groove P5 both sides, and the 5th oil groove P5 notch area is more than the 4th oil groove P4 notch area
And the notch area more than the 6th oil groove P6, all 5th oil groove P5 of rotary spool central angle sum are more than 210 °, the 4th oil
Groove P4 and the 6th oil groove P6 number are equal, and the 4th oil groove P4 is equal with the 6th oil groove P6 central angle；4th oil groove P4 is with going out
Hydraulic fluid port A is connected, and the 5th oil groove P5 connects with oil inlet P, and the 6th oil groove P6 connects with oil return inlet T；Between adjacent 4th oil groove P4
Equidistant, equidistant between adjacent 5th oil groove P5, adjacent 6th oil groove P6 is equidistant.
The valve pocket is provided with some 7th oil groove P7, the 8th oil groove P8, the 9th oil groove P9, the 7th oil groove P7 and the 9th oil
Groove P9 is arranged symmetrically in the 8th oil groove P8 both sides, the 8th oil groove P8 notch area of the notch area more than the 7th oil groove P7 and big
In the 9th oil groove P9 notch area, all 8th oil groove P8 of valve pocket central angle sum is more than 210 °, the 7th oil groove P7 and the
Nine oil groove P9 number is identical, and the 7th oil groove P7 and the 9th oil groove P9 central angle are identical；7th oil groove P7 and oil-out A connects
Logical, the 8th oil groove P8 connects with oil inlet P, and the 9th oil groove P9 connects with oil return inlet T；Equidistant, phase between adjacent 7th oil groove
Equidistant between adjacent 8th oil groove, adjacent 9th oil groove is equidistant.
The number of the 4th oil groove P4 or the 6th oil groove P6 is the first oil groove P1 or the 3rd oil groove P3 or the 7th oil groove P7
Or the 9th 2 times of P9 number of oil groove；First oil groove P1, the 3rd oil groove P3, the 7th oil groove P7 and the 9th oil groove P9 central angle are equal
For β1, the central angle of the 4th oil groove PWM and the 6th oil groove is β2；Angle of first oil groove P1 and the 3rd oil groove P3 adjacent edges etc.
In the central angle β of the 4th oil groove P4 on rotary spool2, β1+β2=90°。
On the circumference of radial cross-section, the central angle of the 4th oil groove and the 6th oil groove on rotary spool is β 2, first
Oil groove P1 and the angle on the adjacent both sides of the 3rd oil groove P3 are just just equal with the 4th oil groove P4 central angle, in this position
When, valve is closed, not to A mouths and T confessions oil.
When position of the valve pocket in valve body keeps constant, the first motor regulation PWM valve core turns left, make the first oil groove P1 and
7th oil groove P7 overlapping area increase, the 3rd oil groove P3 and the 9th oil groove P9 overlapping area reduce.
Oil inlet P in the valve body is interconnected pressure oil with the second oil groove P2, the 5th oil groove P5, the 8th oil groove P8
It is incorporated into cavity volume；First oil groove P1, the 4th oil groove P4, the oil-out A of the 7th oil groove P7 and valve body are interconnected in cavity volume
Pressure oil be incorporated into oil-out A；3rd oil groove P3, the 6th oil groove P6, the 9th oil groove P9 mutually interconnect with the oil return inlet T in valve body
It is logical that pressure oil in cavity volume is incorporated into oil return inlet T.
First motor and the second motor are stepper motor or servomotor.
The first oil groove P1, the 3rd oil groove P3, the 7th oil groove P7, the 8th oil groove P8 number are 2, the 4th oil groove
P4, the 6th oil groove P6 number are 4.
The oil groove shape includes rectangle, triangle or U-shaped.
The present invention has following beneficial effects：
1. the present invention realizes the opening and closing function of high-speed switch valve by the rotary motion of rotary spool, have that noise is small, stream
Measure the advantages of big；More rectangular window is arranged on valve pocket, PWM valve core, rotary spool, then rotary spool rotation one week, just
More PWM cycles can be obtained；The present invention is rotated using servomotor or driving stepper motor rotary spool, by increasing motor
Rotating speed can improve PWM frequency.
2. the drive mechanism of the present invention selection stepper motor or servomotor as rotary spool, simultaneous selection stepper motor
Or governor motion of the servomotor as PWM valve core relative displacement, valve it is compact-sized.
The present invention adjusts dutycycle by changing the relative position of PWM valve core and valve pocket, and rotary spool was often rotated once week
N times that valve can be achieved is opened and closed, and reduces the noise of high-speed switch valve, improves high-speed switch valve life-span, and structure letter
It is single, it is easy to accomplish, suitable for hydraulic control system.
Brief description of the drawings
Fig. 1 is the figure of the structure of the high-speed rotary switch valve of the present invention；
Fig. 2 is expanded schematic diagram of the PWM valve core at 0 ° ~ 360 ° in Fig. 1；
Fig. 3 is expanded schematic diagram of the rotary spool at 0 ° ~ 360 ° in Fig. 1；
Fig. 4 is expanded schematic diagram of the valve pocket at 0 ° ~ 360 ° in Fig. 1；
Fig. 5 is the first oil groove P1 and the 3rd oil groove P3 in Fig. 1 in conplane position relationship schematic diagram；
Fig. 6 is PWM duty cycle when being 50%, valve pocket, rotary spool, the relative position figure of PWM valve core.
Fig. 7 is PWM duty cycle when being 50%, valve pocket, rotary spool, the relative position figure of PWM valve core.
Fig. 8 is PWM duty cycle when being 50%, valve pocket, rotary spool, the relative position figure of PWM valve core.
In figure：1：First motor, 2：First bonnet, 3：First thrust bearing, 4：Valve body, 5：PWM valve core, 6：Rotary valve
Core, 7：Valve pocket, 8：Second thrust bearing, 9：Second bonnet, 10：Second motor, P1：First oil groove（For the oil on PWM valve core
Groove）, P2：Second oil groove（For the oil groove on PWM valve core）, P3：3rd oil groove（For the oil groove on PWM valve core）, P4：4th oil groove
（For the oil groove on rotary spool）, P：5th oil groove（For the oil groove on rotary spool）, P6：6th oil groove（For on rotary spool
Oil groove）, P7：7th oil groove（For the oil groove on valve pocket）, P8：8th oil groove（For the oil groove on valve pocket）, P9：9th oil groove
（For the oil groove on valve pocket）.
Embodiment
With reference to drawings and embodiments further description, present embodiment can be made to the principle and structure of invention
It is detailed description of the invention, any restrictions is not made to the present invention.
Shown in Fig. 1, a kind of high-speed rotary switch valve, include the first motor 1, the first bonnet 2, the first thrust bearing 3,
Valve body 4, PWM valve core 5, rotary spool 6, valve pocket 7, the second thrust bearing 8, the second bonnet 9, PWM valve core 5, the and of rotary spool 6
Valve pocket 7 is disposed coaxially in valve body 4, and rotary spool 6 is arranged between PWM valve core 5 and valve pocket 7；First motor 1, the first bonnet
2nd, the first thrust bearing 3 and PWM valve core 5 are coaxially arranged, the position angle of the first motor 1 regulation PWM valve core 5；Second motor 10,
Second bonnet 9, the second thrust bearing 8 and rotary spool 6 are coaxially arranged, the second motor 10 driving high-speed rotation of rotary spool 6.
Valve body 4 forms 3 hydraulic fluid ports being connected with the external world, i.e. oil inlet P, oil-out A, oil return inlet T with valve pocket 7；Oil return
Mouth T connects with fuel tank, and oil inlet P introduces pressure oil.
As shown in Fig. 2 PWM valve core 5 is axially arranged with two the first oil groove P1, two the second oil groove P2, two the 3rd oil grooves
P3, the radian sum of the second all oil groove P2 is more than 210 ° on PWM valve core, the first oil groove P1 and the 3rd oil groove P3 number phase
Together, central angle is identical；First oil groove P1 connects with oil-out A, and the second oil groove P2 connects with oil inlet P, and the 3rd oil groove P3 is with returning
Hydraulic fluid port T is connected；First oil groove P1, the second oil groove P2 disposed at equal distance, the 3rd oil groove P3 disposed at equal distance.
As shown in figure 3, rotary spool 6 is axially arranged with four the 4th oil groove P4, two the 5th oil groove P5, four the 6th oil
Groove P6, all 5th oil groove P5 radian sum is more than 210 ° on rotary spool 6, the 4th oil groove P4 and the 6th oil groove P6 number
Identical, central angle is identical, and the 4th oil groove P4 and the 6th oil groove P6 on rotary spool 6 are arranged symmetrically in the 5th oil groove P5 both sides；
4th oil groove P4 connects with oil-out A, and the 5th oil groove P5 connects with oil inlet P, and the 6th oil groove P6 connects with oil return inlet T；4th
Oil groove P4 disposed at equal distance, the 5th oil groove P5 disposed at equal distance, the 6th oil groove P6 disposed at equal distance.
As shown in figure 4, valve pocket 7 is axially arranged with two the 7th oil groove P7, two the 8th oil groove P8, two the 9th oil grooves
P9, all 8th oil groove P8 central angle sum is more than 210 ° on valve pocket 7, the 7th oil groove P7 and the 9th oil groove P9 number phase
Together, central angle is identical, and the 7th oil groove P7 and the 9th oil groove P9 on valve pocket 7 are arranged symmetrically in the 8th oil groove P8 both sides；7th oil
Groove P7 connects with oil-out A, and the 8th oil groove P8 connects with oil inlet P, and the 9th oil groove P9 connects with oil return inlet T；7th oil groove P7
Disposed at equal distance, the 8th oil groove P8 disposed at equal distance, the 9th oil groove P9 disposed at equal distance.
As shown in figure 5, the first oil groove P1, the 3rd oil groove P3, the 7th oil groove P7 and the 9th oil groove P9 central angle are β1, the
The central angle of four oil groove PWM and the 6th oil groove is β2；Angle of first oil groove P1 and the 3rd oil groove P3 adjacent edges etc. on PWM valve core
In the central angle β of the 4th oil groove P4 on rotary spool2, β1+β2=90°；
The central angle is the angle that oil groove cross section is formed；
The central angle is also understood that extends to axle center for oil groove cross section, the angle formed using axle center as origin.Example
Such as Fig. 5 β1Or β2。
The central angle of 4th oil groove and the 6th oil groove is β 2, adjacent both sides structure between the first oil groove P1 and the 3rd oil groove P3
Into angle it is equal with the 4th oil groove P4 central angle, at this position, rotary valve is closed, not to A mouths and T mouths
Fuel feeding.
A kind of high-speed rotary On-off rotary valve of the present invention is in the timing of PWM duty cycle one, PWM valve core 5, the and of rotary spool 6
The relative position of valve pocket 7 is as shown in Fig. 6, Fig. 7, Fig. 8.
As shown in fig. 6, the oil inlet P in valve body 4 is interconnected with the second oil groove P2, the 5th oil groove P5, the 8th oil groove P8
Pressure oil is incorporated into cavity volume e；
As shown in fig. 7, the oil-out A in the first oil groove P1, the 4th oil groove P4, the 7th oil groove P7 and valve body 4 is interconnected
Pressure oil in cavity volume e is incorporated into oil-out A；
As shown in figure 8, the oil return inlet T in the 3rd oil groove P3, the 6th oil groove P6, the 9th oil groove P9 and valve body 4 is interconnected
Pressure oil in cavity volume e is incorporated into oil return inlet T.
The number of the 4th oil groove P4 and the 6th oil groove P6 on rotary spool 6 are the first oil groove P1 on PWM valve core 5,
Three oil groove P3 and the 7th oil groove P7 on valve pocket 7,2 times of the 9th P9 number of oil groove.
Position of the valve pocket 7 in valve body 4 keeps constant, and the first motor 1 regulation PWM valve core turns left, the first oil groove P1 and the
Seven oil groove P7 overlapping area increase, the 3rd oil groove P3 and the 9th oil groove P9 overlapping area reduce.
Claims (3)
1. a kind of high-speed rotary switch valve, including motor, bonnet, thrust bearing, valve body, PWM valve core, rotary spool, valve pocket,
PWM valve core, rotary spool and valve pocket are disposed coaxially in valve body, and rotary spool is arranged between PWM valve core and valve pocket；Motor,
Bonnet, thrust bearing and PWM valve core are coaxially arranged, and the first motor adjusts the angle of PWM valve core；Second motor, bonnet, thrust shaft
Hold and rotary spool is coaxially arranged, the second motor driving rotary spool high-speed rotation；It is characterized in that the PWM valve core is provided with some
First oil groove P1, the second oil groove P2 and the 3rd oil groove P3, the second oil groove P2 are arranged between the first oil groove P1 and the 3rd oil groove P3,
Notch area of the second oil groove P2 notch area more than the first oil groove P1 and the notch area more than the 3rd oil groove P3, PWM valve
For all second oil groove P2 of core central angle sum more than 210 °, the first oil groove P1 and the 3rd oil groove P3 number are equal, the first oil
Groove P1 is equal with the 3rd oil groove P3 central angle；First oil groove P1 connects with oil-out A, and the second oil groove P2 connects with oil inlet P,
3rd oil groove P3 connects with oil return inlet T；It is equidistant between adjacent first oil groove P1, equidistant, phase between adjacent second oil groove P2
The 3rd oil groove P3 of neighbour is equidistant；The valve pocket is provided with some 7th oil groove P7, the 8th oil groove P8, the 9th oil groove P9, the 7th oil
Groove P7 and the 9th oil groove P9 is arranged symmetrically in the 8th oil groove P8 both sides, and the 8th oil groove P8 notch area is more than the 7th oil groove P7's
Notch area and the notch area more than the 9th oil groove P9, all 8th oil groove P8 of valve pocket central angle sum are more than 210 °, the
Seven oil groove P7 and the 9th oil groove P9 number is identical, and the 7th oil groove P7 and the 9th oil groove P9 central angle are identical；7th oil groove P7
Connected with oil-out A, the 8th oil groove P8 connects with oil inlet P, and the 9th oil groove P9 connects with oil return inlet T；Adjacent 7th oil groove P7
Between it is equidistant, equidistant between adjacent 8th oil groove P8, adjacent 9th oil groove P9 is equidistant；The rotary spool is provided with some
4th oil groove P4, the 5th oil groove P5 and the 6th oil groove P6, the 4th oil groove P4 and the 6th oil groove P6 are arranged symmetrically in the 5th oil groove P5
Both sides, the 5th oil groove P5 notch area of the notch area more than the 4th oil groove P4 and the notch area more than the 6th oil groove P6,
For all 5th oil groove P5 of rotary spool central angle sum more than 210 °, the 4th oil groove P4 and the 6th oil groove P6 number are equal,
4th oil groove P4 is equal with the 6th oil groove P6 central angle；4th oil groove P4 connects with oil-out A, the 5th oil groove P5 and oil inlet
P is connected, and the 6th oil groove P6 connects with oil return inlet T；It is equidistant between adjacent 4th oil groove P4, it is equidistant between adjacent 5th oil groove P5
From adjacent 6th oil groove P6 is equidistant.
A kind of 2. high-speed rotary switch valve as claimed in claim 1, it is characterized in that the 4th oil groove P4 or the 6th oil groove
P6 number is 2 times of the first oil groove P1 or the 3rd oil groove P3 or the 7th oil groove P7 or the 9th P9 number of oil groove；First oil groove P1,
3rd oil groove P3, the 7th oil groove P7 and the 9th oil groove P9 central angle are β1, the 4th oil groove P4 and the 6th oil groove the P6 center of circle
Angle is β2；Angle between adjacent first oil groove P1 and the 3rd oil groove P3 is equal to the central angle of the 4th oil groove P4 on rotary spool
β2, β1+β2=90°。
A kind of 3. high-speed rotary switch valve as claimed in claim 1, it is characterized in that the first oil groove P1, the 3rd oil groove
P3, the 7th oil groove P7, the 8th oil groove P8 number are 2, and the 4th oil groove P4, the 6th oil groove P6 number are 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610336836.8A CN105972255B (en) | 2016-05-20 | 2016-05-20 | A kind of revolving high-speed switch valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610336836.8A CN105972255B (en) | 2016-05-20 | 2016-05-20 | A kind of revolving high-speed switch valve |
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| CN105972255A CN105972255A (en) | 2016-09-28 |
| CN105972255B true CN105972255B (en) | 2018-04-06 |
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| CN108506715A (en) * | 2018-03-29 | 2018-09-07 | 张新昊 | A kind of rotary fluid observing and controlling valve |
| WO2020143511A1 (en) * | 2019-01-07 | 2020-07-16 | 浙江银轮机械股份有限公司 | Valve, electronic valve, and motor fixing structure for electronic valve |
| CN111075706B (en) * | 2019-12-26 | 2023-10-31 | 宁波真格液压科技有限公司 | Control valve for reciprocating pump and reciprocating pump comprising same |
| CN113153850A (en) * | 2021-03-23 | 2021-07-23 | 同济大学 | Shaft flow distribution high-frequency switch reversing valve |
| CN113153852B (en) * | 2021-03-29 | 2022-08-30 | 南京工程学院 | Direction and flow combined type high-frequency response proportional rotary valve |
| CN113719493B (en) * | 2021-07-22 | 2022-05-13 | 杭州爱力智控技术有限公司 | Rotary reversing valve, hydraulic control system and rubber and plastic all-in-one machine |
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| CN103089732A (en) * | 2013-01-21 | 2013-05-08 | 天津大学 | Double-valve-core rotary type direction throttle valve driven by two motors |
| CN105221796A (en) * | 2015-10-16 | 2016-01-06 | 徐州卓弘机械制造有限公司 | Divided fluid stream control gear |
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| CN105972255A (en) | 2016-09-28 |
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Effective date of registration: 20200413 Address after: 035400 Shanxi city of Xinzhou province Dingxiang County God Shan Wei Cun Patentee after: Shanxi baolongda Forging Co., Ltd Address before: 030024 Yingze, Shanxi Province, Berlin District, West Street, No. 79, No. Patentee before: Taiyuan University of Technology |