CN1936343A - Guide proportion directional throttle valve - Google Patents
Guide proportion directional throttle valve Download PDFInfo
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- CN1936343A CN1936343A CN 200610102032 CN200610102032A CN1936343A CN 1936343 A CN1936343 A CN 1936343A CN 200610102032 CN200610102032 CN 200610102032 CN 200610102032 A CN200610102032 A CN 200610102032A CN 1936343 A CN1936343 A CN 1936343A
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Abstract
This invention discloses a pilot proportion direction throttle characterizing in setting an electronic switch controlled by a shift sensor between an adjuster and a feedback signal adjuster, an adjusting ring for adjusting area of the main valve core is set in the main valve, an open-cycle controller is set between set signal Uxs received by the controller and a proportion amplifying valve, the main valve core and its area adjusting ring are distributed in the main valve coaxially and an oil intake P is set between the core and the valve to induce pressure oil, outlets A and B are connected with two cavities of an executor and a release port T is connected with the oil tank.
Description
Technical field
The invention belongs to the electro-hydraulic control valve technical field, especially fluid flow direction and flow carry out the guide proportion directional throttle valve of continuous ratio control.
Background technique
Pilot-operated electrical liquid proportional directional throttle valve is one of most important element in the electrohydraulic control technology, is mainly used in the occasion of big flow.Its effect is that the direction of fluid flow and the size of flow are carried out continuous control.In the prior art, guide proportion directional throttle valve has valve internal components feedback-type and electrical equipment closed loop control type two big classes, and the former control accuracy is lower, be mainly used in open system, the latter has high dynamic response and control accuracy, can have the function of servovalve, mainly is used in the closed loop control.For the internal feedback valve, at present the principle that adopts mainly contains displacement-force feedback, displacement-pressure balance, guide's decompression, guide's overflow and five kinds of forms of displacement servo-actuated, and most widely used be guide's decompression type valve that German Rexroth company produces.Replace traditional switching mode electro-hydraulic reversing valve though use such proportioning element, can simplify the loop, improve systematic function,, can not large-scale popularization use because manufacture difficulty causes the cost of these elements too high greatly.
For the guide proportion directional throttle valve of electric closed loop,, mainly contain the two closed loop controls of main valve plug and guide's spool, two kinds of forms of pilot valve employing high response servovalve in order to improve its dynamic response.In case maximum deficiency is that main valve plug position-detection sensor and relative device break down, valve is with regard to function out of hand, even causes big production accident.Electricity closed loop valve is structurally also incompatible with the valve of internal components feedback, and such element cost is very high, only requires the occasion of closed loop control just to be used in minority.
Summary of the invention
The present invention improves the structure of existing electrical feedback proportional directional throttle valve, when solution main valve plug position-detection sensor and relative device break down, valve is with regard to function out of hand, even cause the problem of big production accident, and provide a kind of and structurally internal feedback valve and electric closed loop valve can be united, and simple in structure, be easy to make and the guide proportion directional throttle valve that under main valve position-detection sensor fault state, still can work on.
The present invention is based on the problems referred to above and purpose, the first kind of technological scheme that proposes comprises solenoid-operated proportional pilot valve, proportional amplifier, open-cycle controller, main valve plug, main valve body and main valve plug retaining spring, its improvement is to set up the two-position three way solenoid directional control valve between main valve body and solenoid-operated proportional pilot valve, cavity volume e in the main valve body is communicated with the hydraulic fluid port n of two-position three way solenoid directional control valve through runner L1, and the cavity volume f in the main valve body is communicated with the hydraulic fluid port m of two-position three way solenoid directional control valve through runner L2; The hydraulic fluid port q of two-position three way solenoid directional control valve is communicated with hydraulic fluid port c in the solenoid-operated proportional pilot valve, and the hydraulic fluid port t in the solenoid-operated proportional pilot valve is communicated with hydraulic fluid port T on the main valve body; Main valve plug area regulating ring and main valve plug, main valve plug retaining spring coaxial arrangement are in main valve body.
Second kind of technological scheme of guide proportion directional throttle valve of the present invention is to have additional electronic switch, closed loop controller, adder I, adder II, feedback signal amplifier, displacement transducer on the basis of first kind of technological scheme; The input end of electronic switch is connected with the output terminal of closed loop controller, and the output terminal of electronic switch and the output terminal of open-cycle controller are connected to the input end of adder I, and the output terminal of adder I is connected to the input end of proportional amplifier; The output signal of displacement transducer is connected to the feedback signal amplifier input terminal, the output signal of feedback signal amplifier is connected with the control end of electronic switch, the output signal of feedback signal amplifier is connected to the input end of adder II, setting signal Uxs is connected to the input end of adder II and open-cycle controller simultaneously, and the output terminal of adder II is connected to the input end of closed loop controller; Displacement transducer and main valve plug area regulating ring, main valve plug, main valve plug retaining spring coaxial arrangement detect the displacement of main valve plug in main valve body.
The third technological scheme of guide proportion directional throttle valve of the present invention is on the basis of first kind of technological scheme, remove the two-position three way solenoid directional control valve, cavity volume e is communicated with the hydraulic fluid port c of solenoid-operated proportional pilot valve through runner L1, cavity volume f is communicated with the hydraulic fluid port d of solenoid-operated proportional pilot valve through runner L2, and the hydraulic fluid port t of solenoid-operated proportional pilot valve is communicated with hydraulic fluid port T on the main valve body.
The 4th kind of technological scheme of guide proportion directional throttle valve of the present invention is on the basis of first kind of technological scheme, change the solenoid-operated proportional pilot valve into manual proportional pilot valve, remove proportional amplifier, open-cycle controller, promptly constitute the manually type pilot proportion directional throttle valve of control.
In four kinds of above-mentioned technological schemes, described main valve plug is provided with oilhole P
1, P
2And P
3, and be interconnected oilhole P
1With oilhole P
2, valve oil inlet P be communicated with oilhole P
2Along spool axial arranged and with cavity volume e, f is communicated with, oilhole P
3Be symmetricly set on the two ends of main valve plug, and with main valve plug in oilhole P
2Be connected; Described main valve plug area regulating ring is provided with hole K
1With hole K
2, hole K
1With the coaxial installation of main valve plug, hole K
2With oilhole P in the main valve plug
2Interior oil is incorporated into cavity volume e and f; Main valve plug area regulating ring is provided with oilhole P
4With oil groove P
5, oilhole P
4With oilhole P
3Connection is incorporated into oil groove P with pressure oil
5, oil groove P
5Form the throttling limit with the section h of main valve body; Described main valve plug is provided with the step more than three or three; It is to have two throttling limit j1 and j2, three outsides to be connected the bilateral control hydrovalves of hydraulic fluid port c, d and t that described solenoid-operated proportional pilot valve or manual proportional pilot valve are established, or a throttling limit j1, two outside monolateral control hydrovalves that connect hydraulic fluid port c, d are arranged; When the solenoid-operated proportional pilot valve or when manually proportional pilot valve is bilateral control hydrovalve, cavity volume e is communicated with the hydraulic fluid port c of proportional pilot valve through runner L1, cavity volume f is communicated with the hydraulic fluid port d of solenoid-operated proportional pilot valve through runner L2, and the hydraulic fluid port t of solenoid-operated proportional pilot valve is communicated with hydraulic fluid port T on the main valve body; Proportional valve or high-speed switch valve that described solenoid-operated proportional pilot valve is continuous control.
The hydrovalve of continuous control flow direction of the present invention and flow, major advantage be embodied in one be simple in structure, cost is low, be easy to apply.The 2nd, internal feedback valve and electric closed loop valve are structurally united, and at the main valve plug displacement transducer with under the situation that the feedback signal regulator breaks down accordingly, be automatically converted to the internal feedback state of a control, system can be worked on, guaranteed the safety reliability of system.The present invention can replace existing switching mode electro-hydraulic reversing valve, is widely used in hydraulic control system.
Description of drawings
Fig. 1 is the structural principle schematic representation of embodiment of the present invention 1
Fig. 2 is embodiment of the present invention 2 structural principle schematic representation
Fig. 3 is embodiment of the present invention 3 structural principle schematic representation
Fig. 4 is embodiment of the present invention 4 structural principle schematic representation
Fig. 5 is a main valve plug structural representation of the present invention
Fig. 6 is a main valve plug area regulating ring structural representation of the present invention
Among the figure: 1: solenoid-operated proportional pilot valve, 2: proportional amplifier, 3: closed loop controller, 4: feedback signal amplifier, 5: displacement transducer, 6: main valve plug, 7: main valve body, 8: main valve plug retaining spring, 9: electronic switch, 10: main valve plug area regulating ring, 11: open-cycle controller, 12: the two-position three way solenoid directional control valve, 13: adder I, 14: manual proportional pilot valve, 15: adder II, P
1, P
2, P
3, P
4: oilhole.P
5: oil groove, K
1: pilot hole, K
2: oil through, P
1, P
3The axis normal of hole and main valve plug, P
2The hole is by the axis and the perforation spool two limit end faces of main valve plug.
Embodiment
Can make and further describing the principle and the structure of invention with mode of execution in conjunction with the accompanying drawings, present embodiment be a detailed description of the invention, the present invention is not made any restriction.
Mode of execution 1
The guide proportion directional throttle valve of continuous control flow direction of the present invention and flow comprises solenoid-operated proportional pilot valve, proportional amplifier, open-cycle controller, main valve plug, main valve body and main valve plug retaining spring.In Fig. 1, structure characteristic of the present invention is that two-position three way solenoid directional control valve 12 is installed between main valve body 7 and the solenoid-operated proportional pilot valve 1, cavity volume e in the main valve body 7 is communicated with the hydraulic fluid port n of two-position three way solenoid directional control valve 12 through runner L1, and the cavity volume f in the main valve body 7 is communicated with the hydraulic fluid port m of two-position three way solenoid directional control valve 12 through runner L2; The hydraulic fluid port q of two-position three way solenoid directional control valve 12 is communicated with hydraulic fluid port c in the solenoid-operated proportional pilot valve 1, and the hydraulic fluid port t in the solenoid-operated proportional pilot valve 1 is communicated with hydraulic fluid port T on the main valve body 7.Main valve plug area regulating ring 10 and main valve plug 6, main valve plug retaining spring 8 coaxial arrangement are in main valve body 7.
Among Fig. 1, main valve plug 6 forms 4 hydraulic fluid port P that are connected with the external world, A with main valve body 7, B, T, wherein, the P mouth is a filler opening, introduces pressure oil, A, B is an oil outlet, be communicated with two chambeies of final controlling element, the T mouth is a return opening, is communicated with fuel tank, oil outlet A, the size of B and oil return inlet T open amount is directly proportional with the displacement amount of main valve plug 6.
The structure of main valve plug 6 has 3 steps as shown in Figure 5, and 4 steps also can be arranged, and has oilhole P on the main valve plug 6
1, P
2And P
3In spool, be communicated with oilhole P
1Be communicated with oilhole P with the oil inlet P of valve
2With cavity volume e, f is communicated with, oilhole P
3Be arranged symmetrically in main valve plug 6 two ends, at main valve plug 6 inner and oilhole P
2Be communicated with.
The structure of the area regulating ring 10 of main valve plug 6 has two as shown in Figure 6, processes porose K thereon
1And K
2, its mesopore K
1Cooperate coaxial installation with main valve plug 6, oilhole K
2With oilhole P in the main valve plug 6
2Interior oil is incorporated into cavity volume e, and f also is processed with oilhole P on it
4With oil groove P
5, oilhole P
4With oil groove P
5Symmetric arrangement, oilhole P
4With oil groove P
3Be communicated with, pressure oil is incorporated into oil groove P
5, oil groove P
5Form the throttling limit with the section h of main valve body 7.
The said structure feature constitutes the type pilot proportion directional throttle valve of first kind of technological scheme.
Mode of execution 2
Among Fig. 2, as the structure and the working principle of the guide proportion directional throttle valve of mode of execution 1 described continuous control flow direction of the present invention and flow, mode of execution 2 is to have additional electronic switch 9, closed loop controller 11, adder I13, adder II15, feedback signal amplifier 4, displacement transducer 5 on the basis of mode of execution 1.The input end of electronic switch 9 is connected with the output terminal of closed loop controller 3, and the output terminal of the output terminal of electronic switch 9 and open-cycle controller 11 is connected to the input end of adder I13, and the output terminal of adder I13 is connected to the input end of proportional amplifier 2; The output signal of displacement transducer 5 is connected to the input end of feedback signal amplifier 4, the output signal of feedback signal amplifier 4 is connected with the control end of electronic switch 9, the output signal of feedback signal amplifier 4 is connected to the input end of adder II15, setting signal Uxs is connected to the input end of adder II15 and open-cycle controller 11 simultaneously, and the output terminal of adder II15 is connected to the input end of closed loop controller 3; Displacement transducer 5 and main valve plug area regulating ring 10, main valve plug 6, main valve plug retaining spring 8 coaxial arrangement detect the displacement of main valve plug 6 in main valve body 7.
In Fig. 2, electronic switch 9 is controlled by the working state of displacement transducer 5, under the situation that displacement transducer 5 and feedback signal amplifier 4 break down, electronic switch 9 is with regard to automatic disconnection, at this moment the working state of closed loop valve in whole valve is under the control of open-cycle controller 11, the displacement amount of control main valve plug 6 that still can continuous ratio.Open-cycle controller is accepted setting signal Uxs, and this signal carried out after the conversion being input to proportional amplifier 2 behind the signal plus with PID closed loop controller 3, main valve plug 6, form cavity volume e and f between main valve plug area regulating ring 10 and the main valve body 7, cavity volume e is communicated with the hydraulic fluid port c of solenoid-operated proportional pilot valve 1, cavity volume f is communicated with the hydraulic fluid port d of solenoid-operated proportional pilot valve 1, but solenoid-operated proportional pilot valve 1 is the Proportional valve of move left and right, hydraulic fluid port c is arranged on it, d and t, the size of these 3 hydraulic fluid port opening amounts and given signal are proportional, hydraulic fluid port c and d are in closed condition when no signal, when the spool of solenoid-operated proportional pilot valve 1 is moved to the left, hydraulic fluid port c opens greatly, be communicated with cavity volume e and hydraulic fluid port t, but the electromagnetic pilot spool is when moving right, hydraulic fluid port d opens greatly, is communicated with cavity volume f and hydraulic fluid port t.
The structure of main valve plug 6 has 3 steps as shown in Figure 5, and 4 steps also can be arranged, and has oilhole P on the main valve plug 6
1, P
2And P
3In spool, be communicated with oilhole P
1Be communicated with oilhole P with the oil inlet P of valve
2With cavity volume e, f is communicated with, oilhole P
3Be arranged symmetrically in main valve plug 6 two ends, at main valve plug 6 inner and oilhole P
2Be communicated with.
The structure of the area regulating ring 10 of main valve plug 6 has two as shown in Figure 6, processes porose K thereon
1And K
2, its mesopore K
1Cooperate coaxial installation with main valve plug 6, oilhole K
2With oilhole P in the main valve plug 6
2Interior oil is incorporated into cavity volume e, and f also is processed with oilhole P on it
4With oil groove P
5, oilhole P
4With oil groove P
5Symmetric arrangement, oilhole P
4With oil groove P
3Be communicated with, pressure oil is incorporated into oil groove P
5, oil groove P
5Form the throttling limit with the section h of main valve body 7,
The said structure feature constitutes the type pilot proportion directional throttle valve of second kind of technological scheme.
Mode of execution 3
Formation and working principle as the guide proportion directional throttle valve of continuous control flow direction of the present invention described in mode of execution 1 and 2 and flow, mode of execution 3 is on the basis of mode of execution 2, remove two-position three way solenoid directional control valve 12, cavity volume e is communicated with the hydraulic fluid port c of solenoid-operated proportional pilot valve 1 through runner L1, cavity volume f is communicated with the hydraulic fluid port d of solenoid-operated proportional pilot valve 1 through runner L2, and the hydraulic fluid port t of solenoid-operated proportional pilot valve 1 is communicated with hydraulic fluid port T on the main valve body 7.This structure characteristic constitutes the third type pilot proportion directional throttle valve.
Mode of execution 4
Formation and working principle as the guide proportion directional throttle valve of continuous control flow direction of the present invention described in mode of execution 1 and 2 and flow, mode of execution 4 is on the basis of mode of execution 1, change solenoid-operated proportional pilot valve 1 into manual proportional pilot valve 14, remove proportional amplifier 2, open-cycle controller 11, this structure characteristic constitutes the 4th kind of manually type pilot proportion directional throttle valve of control.
Claims (9)
1. guide proportion directional throttle valve, it contains solenoid-operated proportional pilot valve, proportional amplifier, open-cycle controller, main valve plug, main valve body and main valve plug retaining spring, it is characterized in that two-position three way solenoid directional control valve (12) is installed between main valve body (7) and the solenoid-operated proportional pilot valve (1), cavity volume e in the main valve body (7) is communicated with the hydraulic fluid port n of two-position three way solenoid directional control valve (12) through runner L1, and the cavity volume f in the main valve body (7) is communicated with the hydraulic fluid port m of two-position three way solenoid directional control valve (12) through runner L2; The hydraulic fluid port q of two-position three way solenoid directional control valve (12) is communicated with hydraulic fluid port c in the solenoid-operated proportional pilot valve (1), and the hydraulic fluid port t in the solenoid-operated proportional pilot valve (1) is communicated with hydraulic fluid port T on the main valve body (7); Main valve plug area regulating ring (10) and main valve plug (6), main valve plug retaining spring (8) coaxial arrangement are in main valve body (7).
2. guide proportion directional throttle valve as claimed in claim 1 is characterized in that having additional electronic switch (9), closed loop controller (11), adder I (13), adder II (15), feedback signal amplifier (4), displacement transducer (5); The input end of electronic switch (9) is connected with the output terminal of closed loop controller (3), the output terminal of the output terminal of electronic switch (9) and open-cycle controller (11) is connected to the input end of adder I (13), and the output terminal of adder I (13) is connected to the input end of proportional amplifier (2); The output signal of displacement transducer (5) is connected to the input end of feedback signal amplifier (4), the output signal of feedback signal amplifier (4) is connected with the control end of electronic switch (9), the output signal of feedback signal amplifier (4) is connected to the input end of adder II (15), setting signal Uxs is connected to the input end of adder II (15) and open-cycle controller (11) simultaneously, and the output terminal of adder II (15) is connected to the input end of closed loop controller (3); Displacement transducer (5) and main valve plug area regulating ring (10), main valve plug (6), main valve plug retaining spring (8) coaxial arrangement detect the displacement of main valve plug (6) in main valve body (7).
3. as claim 1 and 2 described guide proportion directional throttle valves, it is characterized in that cavity volume e is communicated with the hydraulic fluid port c of solenoid-operated proportional pilot valve (1) through runner L1, cavity volume f is communicated with the hydraulic fluid port d of solenoid-operated proportional pilot valve (1) through runner L2, and the hydraulic fluid port t of solenoid-operated proportional pilot valve (1) is communicated with hydraulic fluid port T on the main valve body (7).
4. guide proportion directional throttle valve as claimed in claim 1, it is characterized in that changing solenoid-operated proportional pilot valve (1) into manual proportional pilot valve (14), remove proportional amplifier (2), open-cycle controller (11), promptly constitute the manually type pilot proportion directional throttle valve of control.
5. as the described guide proportion directional throttle valve of claim 1～4, it is characterized in that main valve plug (6) is provided with oilhole P
1, P
2And P
3, and be interconnected oilhole P
1With oilhole P
2, valve oil inlet P be communicated with oilhole P
2Along spool axial arranged and with cavity volume e, f is communicated with, oilhole P
3Be symmetricly set on the two ends of main valve plug (6), and with main valve plug (6) in oilhole P
2Be connected;
6. as the described guide proportion directional throttle valve of claim 1～4, it is characterized in that main valve plug area regulating ring (10) is provided with hole K
1With hole K
2, hole K
1With the coaxial installation of main valve plug (6), hole K
2With the interior oilhole P of main valve plug (6)
2Interior oil is incorporated into cavity volume e and f; Main valve plug area regulating ring (10) is provided with oilhole P
4With oil groove P
5, oilhole P
4With oilhole P
3Connection is incorporated into oil groove P with pressure oil
5, oil groove P
5Form the throttling limit with the section h of main valve body (7).
7. as the described guide proportion directional throttle valve of claim 1～4, it is characterized in that main valve plug (6) is provided with the step more than three or three.
8. as the described guide proportion directional throttle valve of claim 1～4, it is characterized in that solenoid-operated proportional pilot valve (1) or manually proportional pilot valve (14) be to be provided with two throttling limit j1 and j2, three outside bilateral control hydrovalves that are connected hydraulic fluid port c, d and t, or the monolateral control hydrovalves of a throttling limit j1, two outside connection hydraulic fluid port c, d; When solenoid-operated proportional pilot valve (1) or when manually proportional pilot valve (14) is bilateral control hydrovalve, cavity volume e is communicated with the hydraulic fluid port c of proportional pilot valve (1) through runner L1, cavity volume f is communicated with the hydraulic fluid port d of solenoid-operated proportional pilot valve (1) through runner L2, and the hydraulic fluid port t of solenoid-operated proportional pilot valve (1) is communicated with hydraulic fluid port T on the main valve body (7).
9. guide proportion directional throttle valve as claimed in claim 1 is characterized in that solenoid-operated proportional pilot valve (1) is the Proportional valve or the high-speed switch valve of continuous control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610102032A CN100590324C (en) | 2006-10-16 | 2006-10-16 | Guide proportion directional throttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610102032A CN100590324C (en) | 2006-10-16 | 2006-10-16 | Guide proportion directional throttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1936343A true CN1936343A (en) | 2007-03-28 |
| CN100590324C CN100590324C (en) | 2010-02-17 |
Family
ID=37954008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610102032A Expired - Fee Related CN100590324C (en) | 2006-10-16 | 2006-10-16 | Guide proportion directional throttle valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100590324C (en) |
Cited By (12)
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|---|---|---|---|---|
| CN102954057A (en) * | 2012-11-22 | 2013-03-06 | 太原理工大学 | Electric closed-loop control three-way proportional pressure-reducing valve |
| CN103335834A (en) * | 2013-07-02 | 2013-10-02 | 南京工业大学 | Throttle valve port performance test device |
| CN104675804A (en) * | 2014-03-17 | 2015-06-03 | 南通爱慕希机械有限公司 | Comprehensive hydraulic cylinder performance testing system |
| CN105003477A (en) * | 2015-06-19 | 2015-10-28 | 太原理工大学 | Motor cooperative control pilot-operated electro-hydraulic valve |
| CN105545852A (en) * | 2015-12-30 | 2016-05-04 | 浙江大学 | High-speed switch pilot proportioning valve |
| CN105822624A (en) * | 2016-05-18 | 2016-08-03 | 浙江大学 | Dynamic valve element testing system for pilot-operated type load control valve |
| CN106246629A (en) * | 2016-10-11 | 2016-12-21 | 太原理工大学 | External control type guide proportion directional valve |
| CN106481609A (en) * | 2015-08-27 | 2017-03-08 | 山路宪平 | Proportional control solenoid valve system |
| CN106555785A (en) * | 2016-10-11 | 2017-04-05 | 太原理工大学 | Type pilot proportion directional flow rate continuous control valve |
| CN111237277A (en) * | 2020-01-17 | 2020-06-05 | 太原理工大学 | Proportional flow valve based on pilot flow-main spool displacement feedback mechanism |
| CN111486148A (en) * | 2020-05-26 | 2020-08-04 | 青岛鸿合数字技术有限公司 | Electric proportional hydraulic control device for multi-way valve and data processing method thereof |
| CN114352784A (en) * | 2022-01-19 | 2022-04-15 | 上海海岳液压机电工程有限公司 | Throttle valve for bidirectional pressure regulation |
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| CN102954057A (en) * | 2012-11-22 | 2013-03-06 | 太原理工大学 | Electric closed-loop control three-way proportional pressure-reducing valve |
| CN103335834A (en) * | 2013-07-02 | 2013-10-02 | 南京工业大学 | Throttle valve port performance test device |
| CN103335834B (en) * | 2013-07-02 | 2015-08-19 | 南京工业大学 | Throttle valve port performance test device |
| CN104675804A (en) * | 2014-03-17 | 2015-06-03 | 南通爱慕希机械有限公司 | Comprehensive hydraulic cylinder performance testing system |
| CN105003477A (en) * | 2015-06-19 | 2015-10-28 | 太原理工大学 | Motor cooperative control pilot-operated electro-hydraulic valve |
| CN106481609B (en) * | 2015-08-27 | 2018-06-29 | 山路宪平 | Proportional control solenoid valve system |
| CN106481609A (en) * | 2015-08-27 | 2017-03-08 | 山路宪平 | Proportional control solenoid valve system |
| CN105545852A (en) * | 2015-12-30 | 2016-05-04 | 浙江大学 | High-speed switch pilot proportioning valve |
| CN105545852B (en) * | 2015-12-30 | 2017-05-17 | 浙江大学 | High-speed switch pilot proportioning valve |
| CN105822624B (en) * | 2016-05-18 | 2017-07-11 | 浙江大学 | A kind of valve element dynamic test system of pilot-operated type load control valve |
| CN105822624A (en) * | 2016-05-18 | 2016-08-03 | 浙江大学 | Dynamic valve element testing system for pilot-operated type load control valve |
| CN106555785A (en) * | 2016-10-11 | 2017-04-05 | 太原理工大学 | Type pilot proportion directional flow rate continuous control valve |
| CN106246629B (en) * | 2016-10-11 | 2017-10-13 | 太原理工大学 | External control type guide proportion directional valve |
| CN106246629A (en) * | 2016-10-11 | 2016-12-21 | 太原理工大学 | External control type guide proportion directional valve |
| CN111237277A (en) * | 2020-01-17 | 2020-06-05 | 太原理工大学 | Proportional flow valve based on pilot flow-main spool displacement feedback mechanism |
| CN111237277B (en) * | 2020-01-17 | 2021-10-15 | 太原理工大学 | Proportional flow valve based on pilot flow-main spool displacement feedback mechanism |
| CN111486148A (en) * | 2020-05-26 | 2020-08-04 | 青岛鸿合数字技术有限公司 | Electric proportional hydraulic control device for multi-way valve and data processing method thereof |
| CN114352784A (en) * | 2022-01-19 | 2022-04-15 | 上海海岳液压机电工程有限公司 | Throttle valve for bidirectional pressure regulation |
| CN114352784B (en) * | 2022-01-19 | 2024-03-15 | 上海海岳液压机电工程有限公司 | Throttle valve for bidirectional pressure regulation |
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| CN100590324C (en) | 2010-02-17 |
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