CN108071621A - Leakage-free pressure compensation electromagnetic proportioning valve - Google Patents

Leakage-free pressure compensation electromagnetic proportioning valve Download PDF

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Publication number
CN108071621A
CN108071621A CN201711225702.XA CN201711225702A CN108071621A CN 108071621 A CN108071621 A CN 108071621A CN 201711225702 A CN201711225702 A CN 201711225702A CN 108071621 A CN108071621 A CN 108071621A
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CN
China
Prior art keywords
valve
pressure compensation
valve body
iron core
leakage
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Granted
Application number
CN201711225702.XA
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Chinese (zh)
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CN108071621B (en
Inventor
陈艳艳
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Zhejiang stante Valve Co., Ltd
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Ningbo Wen Fan Electrical And Mechanical Technology Development Co Ltd
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Priority to CN201711225702.XA priority Critical patent/CN108071621B/en
Publication of CN108071621A publication Critical patent/CN108071621A/en
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Publication of CN108071621B publication Critical patent/CN108071621B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30Details
    • F16K3/314Forms or constructions of slides; Attachment of the slide to the spindle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/02Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644One-way valve
    • F16K31/0668Sliding valves

Abstract

The invention discloses leakage-free pressure compensation electromagnetic proportioning valves, P mouthfuls and T mouthfuls are offered on its valve body, the top of valve body is equipped with valve pocket, and the top of valve pocket is equipped with proportion electro-magnet, static iron core, dynamic iron core, the first spring are provided in proportion electro-magnet, dynamic iron core is provided centrally with pilot valve;The top of valve body is provided with main valve plug, control chamber is formed with above main valve plug in valve pocket, first flow hole and second flow channel hole are provided on main valve plug, the first damping hole is provided on first flow hole, the second damping hole is provided on second flow channel hole, the lower end of pilot valve is engaged with the second damping hole;The lower part of valve body is provided with pressure compensation spool, and pressure compensation spool is equipped with throttle orifice, and the lower end of valve body is provided with screw plug, sensitive cavity is formed in valve body, sensitive cavity is connected by drawing oilhole with P mouthfuls, when pressure compensation spool is located at upper limit, is communicated between through-flow chamber and T mouthfuls by throttle orifice.It the advantage is that:It is rational in infrastructure, compact, fast response time.

Description

Leakage-free pressure compensation electromagnetic proportioning valve
Technical field
The present invention relates to hydraulic valve manufacturing technology field, especially leakage-free pressure compensation electromagnetic proportioning valve.
Background technology
In recent years, proportional control valve is in lifting devices such as truck-mounted crane, high-altitude operation vehicle, tractor rotary tillage plough, electri forklifts Upper application is more and more.In hydraulic system for lifting is loaded, usually using proportional reversing valve load is declined, it is general to decline Speed is adjusted by the opening of proportional reversing valve, but in the case where load variation is big, speed can be caused sometimes fast and sometimes slow, made It is unstable into system.And these proportional reversing valves are guiding valve form, and when closing or allowing load to stop, load cannot be protected It holds in a certain position, can glide, the pressure of cavity volume can not be kept well in the case where needing pressurize.Or using cone valve The valve of form adds the flow valve of pressure compensator composition, but because pressure compensator currently on the market is guiding valve form and Load port pressure will guide to pressure compensator load feedback chamber, therefore equally exist the problems such as leakage rate is big, load keeps not living; And individual pressure compensator integrated level is not high, and volume is larger, even if being also not suitable for without the problem of above-mentioned leakage with upper It states on lifting device.
The patent of existing Patent No. 201621273379.4 entitled " the electric proportional throttle valve of leakage-free pressure compensation " is public A kind of proportional flow control valve for being integrated with pressure compensator has been opened, proportional flow regulatory function is realized by proportion electro-magnet, it is main Valve is connected with pressure-compensated valve, draws oilhole and the pressure before main valve throttling side is introduced compensator, pass through second spring and compensation Pressure difference is constant before and after spool compensates guarantee main valve throttling side, not with the variation of load.Coil must not electricity in the case of, first Guide valve core can seal, and main valve plug is tightly pressed against on valve port by hydraulic coupling so that valve port is without any leakage, and due to drawing oilhole Rear end draw the front side that oil-in is located at seal line, so drawing oilhole in the off state can also completely close, reduce leakage rate. Although the said goods can realize No leakage pressurize and the control of pressure compensated proportional flow, there is also following shortcomings:
(1) due to the front side drawn oilhole and be located at seal line of pressure compensator, when coil must not be electric, pressure compensator Sensitive cavity is no pressure, and such pressure compensator is under the active force of second spring by the fully open shape of valve port Condition, when given coil certain voltage, since the unlatching of main valve plug is than relatively rapid, when the throttling channel of main valve plug has already turned on When, the pressure of pressure compensator sensitive cavity is completely set up not yet, and at this time pressure compensator is still in full-gear, nothing Pressure compensation can so cause the moment flow attack opened, and generate vibration to mechanical equipment, influence to use safely.
(2) rear end of the second spring in its pressure compensator is installed on spring base, and the fluid of such main valve plug will be through Cross on spring base through flow hole outflow, in order to ensure that through-current capability does not impact the flow-rate adjustment of main valve plug, usually The very great talent of spring base design can ensure the area of passage of through flow hole, can so cause the diameter of integral valve excessive, not compact.
The content of the invention
The technical problem to be solved by the invention for the present situation of prior art is to provide rational in infrastructure, compact, response speed Spend fast leakage-free pressure compensation electromagnetic proportioning valve.
Technical solution is used by the present invention solves above-mentioned technical problem:
Leakage-free pressure compensation electromagnetic proportioning valve includes valve body, and P mouthfuls and T mouthfuls, the top dress of valve body are offered on valve body Equipped with valve pocket, the top of the valve pocket is equipped with proportion electro-magnet, and proportion electro-magnet internal upper part is provided with static iron core, under static iron core Side is equipped with dynamic iron core, and the first spring is provided between static iron core and dynamic iron core, and dynamic iron core is provided centrally with lower end as taper The pilot valve of structure;
The top of valve body is provided with main valve plug, and control chamber is formed with above main valve plug in valve pocket, is set on main valve plug There are first flow hole and second flow channel hole, the first damping hole is provided on first flow hole, second flow channel is provided with second on hole Damping hole, the lower end of pilot valve are engaged with the second damping hole, and first flow hole turns on control chamber and P mouthfuls, second flow channel hole Turn on the through-flow chamber in the middle part of control chamber and valve body;
The lower part of valve body is provided with pressure compensation spool, and compensating spool top is provided with throttle orifice, and the lower end of valve body is provided with Screw plug, valve body is interior to be formed with sensitive cavity above screw plug, and sensitive cavity is connected by drawing oilhole with P mouthfuls, pressure compensation spool During positioned at upper limit, through-flow chamber is connected with T mouthfuls by above-mentioned throttle orifice.
Through-flow intracavitary in the middle part of valve body is provided with spring base, and spring base is formed a fixed connection by straight pin and valve body, bullet Second spring is provided between spring abutment and the pressure compensation spool.
The technical measures of optimization further include:
The lower central of above-mentioned static iron core is provided with cavity, and the upper end of the first spring is placed in the fovea superior intracavitary.
The central upper portion of above-mentioned dynamic iron core is provided with lower cavity, and the lower end of the first spring is placed in the recessed intracavitary, and with The upper surface of pilot valve offsets cooperation.
The section of above-mentioned dynamic iron core is in "convex" shaped structure, and the lower end of static iron core is provided with and dynamic iron core lower end phase The groove of adaptation.
Catch is provided in above-mentioned control chamber, banking stop is provided with above the catch.
Valve port cone match between above-mentioned main valve plug and P mouthfuls and through-flow chamber.
Above-mentioned pressure compensation spool and the valve port cone match of sensitive cavity upper end in valve body.
Above-mentioned spring base structure in T shape, second spring are sheathed on the spring base.
Above-mentioned valve pocket is provided outside valve pocket sealing ring.
Above-mentioned valve body is provided outside valve seals and limit stop ring.
Leakage-free pressure compensation electromagnetic proportioning valve of the present invention, it is rational in infrastructure, by the improvement in structure, make flow valve Structure is more compact, volume smaller;It is turned on P mouthfuls with sensitive cavity by drawing oilhole, in proportion electro-magnet no power, quick Feel under the effect of intracavitary oil pressure, pressure compensation spool closing valve port, meanwhile, pilot valve closes the second damping hole, main valve plug closing P Valve port between mouth and through-flow chamber ensures flow valve No leakage.In addition, it is communicated between through-flow chamber and T mouthfuls by throttle orifice, in ratio After electromagnet is powered, the response speed of flow valve can be greatly improved, and flow attack will not be generated.Spring base is passed through into cylinder Pin is fixedly connected with the valve body, and can make the area of passage of through-flow chamber will not be influenced be subject to spring base, thus the entirety of the present invention Volume is compacter.
Description of the drawings
Fig. 1 is the schematic cross-sectional view of the present invention;
Fig. 2 is I portions enlarged drawing in Fig. 1;
Fig. 3 is II enlarged drawing in Fig. 1;
Fig. 4 is the partial sectional view in Fig. 1;
Fig. 5 is the hydraulic principle figure of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing embodiment.
It is as shown in Figures 1 to 4 the structure diagram of the present invention,
Reference numeral therein is:P mouthfuls, T mouthfuls, valve body 1, through-flow chamber 1a, sensitive cavity 1b, draw oilhole 1c, valve seals 11st, limit stop ring 12, valve pocket 2, control chamber 2a, valve pocket sealing ring 21, proportion electro-magnet 3, static iron core 41, upper cavity 41a, groove 41b, dynamic iron core 42, lower cavity 42a, the first spring 43, pilot valve 5, main valve plug 6, first flow hole 61, the first damping hole 61a, second flow channel hole 62, the second damping hole 62a, pressure compensation spool 7, second spring 71, screw plug 8, throttle orifice 7a, spring base 9th, straight pin 10, catch 91, banking stop 92.
As shown in Figures 1 to 4,
Leakage-free pressure compensation electromagnetic proportioning valve includes valve body 1, offers P mouthfuls and T mouthfuls on valve body 1, valve body 1 it is upper Portion is equipped with valve pocket 2, and the top of the valve pocket 2 is equipped with proportion electro-magnet 3, and 3 internal upper part of proportion electro-magnet is provided with static iron core 41, The fit beneath of static iron core 41 has dynamic iron core 42, and the first spring 43, dynamic iron core 42 are provided between static iron core 41 and dynamic iron core 42 Be provided centrally with lower end be pyramidal structure pilot valve 5;
The top of valve body 1 is provided with main valve plug 6, and control chamber 2a, main valve plug 6 are formed in the top of main valve plug 6 in valve pocket 2 On be provided with first flow hole 61 and second flow channel hole 62, the first damping hole 61a, second flow channel are provided on first flow hole 61 The second damping hole 62a is provided on hole 62, the lower end of pilot valve 5 is engaged with the second damping hole 62a, and first flow hole 61 is led Logical 2a and P mouthfuls of control chamber, second flow channel hole 62 turn on the through-flow chamber 1a at 1 middle part of control chamber 2a and valve body;
The lower part of valve body 1 is provided with pressure compensation spool 7, and 7 top of pressure compensation spool is provided with throttle orifice 7a, valve body 1 Lower end is provided with screw plug 8, sensitive cavity 1b is formed in the top of screw plug 8 in valve body 1, sensitive cavity 1b is by drawing oilhole 1c and P mouthfuls It is connected, when pressure compensation spool 7 is located at upper limit, through-flow chamber 1a is communicated with T mouthfuls by throttle orifice 7a.
Spring base 9 is provided in the through-flow chamber 1a at 1 middle part of valve body, spring base 9 is formed by straight pin 10 and valve body 1 and fixed Connection, second spring 71 is provided between spring base 9 and the pressure compensation spool 7.
In embodiment, the lower central of static iron core 41 is provided with cavity 41a, and the upper end of the first spring 43 is placed on this In cavity 41a.
In embodiment, the central upper portion of dynamic iron core 42 is provided with lower cavity 42a, and it is recessed that the lower end of the first spring 43 is placed in this In chamber 42a, and offset cooperation with the upper surface of pilot valve 5.
First spring 43 is placed in upper cavity 41a and lower cavity 42a, is not only able to that assembling is made to become convenient, Er Qieneng The structure for enough making flow valve is more compact.
In embodiment, in "convex" shaped structure, the lower end of static iron core 41 is provided with and the dynamic iron in the section of dynamic iron core 42 The groove 41b that 42 lower end of core is adapted.
In embodiment, catch 91 is provided in control chamber 2a, the top of the catch 91 is provided with banking stop 92.Banking stop 92 Effect be to limit the axial displacement of dynamic iron core 42, when the lower end of dynamic iron core 42 and banking stop 92 offset, just cannot move down again .
In embodiment, the valve port cone match between main valve plug 6 and P mouthfuls and through-flow chamber 1a.
In embodiment, pressure compensation spool 7 and the valve port cone match of sensitive cavity 1b upper ends in valve body 1.
Cone match is used at valve port, can farthest improve the leakproofness of valve port.
In embodiment, spring base 9 is in inverted T-shape structure, and second spring 71 is sheathed on the spring base 9.
In embodiment, valve pocket 2 is provided outside valve pocket sealing ring 21.
In embodiment, valve body 1 is provided outside valve seals 11 and limit stop ring 12.Valve seals 11 and limit stop ring 12 in the outer wall of valve body 1, and the axial displacement of valve seals 11 is capable of in the setting of limit stop ring 12, ensures flow valve peace During dress, the position of valve seals 11 is not deviateed, and ensures the reliability of sealing.
Operation principle:
When 3 no power of proportion electro-magnet, dynamic iron core 42 is located at lower limit, pilot valve 5 under the effect of the first spring 43 The pyramidal structure of lower end closes the second damping hole 62a, meanwhile, main valve plug 6 closes valve port, makes between P mouthfuls and through-flow chamber 1a It blocks;P mouthfuls of fluid enters sensitive cavity 1b from oilhole 1c is drawn, and in sensitive cavity 1b under oil pressure effect, pressure compensation spool 7 is located at Upper limit and close valve port.It so just ensure that flow valve No leakage, reliable holding can be played to load.
When proportion electro-magnet 3 is powered, dynamic iron core 42 overcomes the elastic force of the first spring 43 upward under the action of electromagnetic force Movement, and pilot valve 5 is driven to move upwards, the lower end and the second damping hole 62a for making pilot valve 5 are separated, the second damping Hole 62a is turned on, and P mouthfuls of fluid is successively through first flow hole 61, the first damping hole 61a, the second damping hole 62a, second flow channel hole 62 enter through-flow chamber 1a, and due to being connected between through-flow chamber 1a and T mouthfuls by throttle orifice 7a, part fluid will be from T mouthfuls of outflows.
Due to the setting of the first damping hole 61a, at the initial stage of energization, oil pressure is less than the oil in sensitive cavity 1b in through-flow chamber 1a Pressure, pressure compensation spool 7 is still in upper limit;And the fluid flow flowed out from throttle orifice 7a is less than inflow flow, through-flow chamber 1a Interior pressure will constantly increase, and the pressure in through-flow chamber 1a further increases, increased oil pressure will by pressure compensation spool 7 to Under push away, through-flow chamber 1a and T mouthfuls of runner is made gradually to open greatly.Whole process is through-flow chamber 1a is steadily opened greatly with T mouthfuls of runner, will not be produced Raw flow attack.When T mouthfuls of pressure changes, pressure compensation spool 7 increases or subtracts under the action of P mouthfuls of pressure and T mouthfuls of pressure Aperture T mouthfuls small, ensure main valve plug 6 before and after pressure difference it is constant namely P mouthful with through-flow chamber 1a in pressure difference value it is constant, so when When 3 voltage of proportion electro-magnet is constant, the flow by T mouthfuls of outputs is constant.
Due to leaving the setting of throttle orifice 7a between through-flow chamber 1a and T mouthfuls, this flow valve is after the energization of proportion electro-magnet 3, P Mouthful with immediately passing through first flow hole 61 between T mouthfuls, second flow channel hole 62, through-flow chamber 1a are turned on, therefore can be greatly improved sound Answer speed.
In addition, the setting that through-flow chamber 1a inner springs seat 9 is fixedly connected by straight pin with valve body 1, does not interfere with through-flow chamber The area of passage of 1A, it is through-flow under the premise of it need not increase valve body 1 directly so as to not interfere with the flow after flow valve is opened Ability bigger.
Highly preferred embodiment of the present invention has illustrated, and the various change or remodeling made by those of ordinary skill in the art are not It can depart from the scope of the present invention.

Claims (10)

1. leakage-free pressure compensation electromagnetic proportioning valve includes valve body (1), the valve body offers P mouthfuls and T mouthfuls on (1), It is characterized in:The top of the valve body (1) is equipped with valve pocket (2), and the top of the valve pocket (2) is equipped with proportion electro-magnet (3), institute Proportion electro-magnet (3) internal upper part stated is provided with static iron core (41), and the fit beneath of static iron core (41) has dynamic iron core (42), described Static iron core (41) and dynamic iron core (42) between be provided with the first spring (43), under being provided centrally with of the dynamic iron core (42) Hold the pilot valve (5) for pyramidal structure;
The top of the valve body (1) is provided with main valve plug (6), is formed in the valve pocket (2) above main valve plug (6) Control chamber (2a) is provided with first flow hole (61) and second flow channel hole (62) on main valve plug (6), and first flow hole is set on (61) Be equipped with the first damping hole (61a), be provided with the second damping hole (62a) on second flow channel hole (62), the lower end of pilot valve (5) with Second damping hole (62a) is engaged, and first flow hole (61) turn on control chamber (2a) and P mouthfuls, second flow channel hole (62) conducting control Through-flow chamber (1a) in the middle part of chamber (2a) processed and valve body (1);
The lower part of the valve body (1) is provided with pressure compensation spool (7), and compensating spool (7) top is provided with throttle orifice (7a), the lower end of the valve body (1) are provided with screw plug (8), are formed in the valve body (1) above screw plug (8) quick Feel chamber (1b), the sensitive cavity (1b) is connected by drawing oilhole (1c) with P mouthfuls, and pressure compensation spool (7) is located at upper limit When, through-flow chamber (1a) is connected with T mouthfuls by throttle orifice (7a).
Spring base (9) is provided in through-flow chamber (1a) in the middle part of the valve body, the spring base (9) passes through straight pin (13) and valve Body (1) forms a fixed connection, and second spring (71) is provided between the spring base (9) and the pressure compensation spool (7).
2. leakage-free pressure compensation electromagnetic proportioning valve according to claim 1, it is characterized in that:The static iron core (41) Lower central be provided with cavity (41a), the upper end of first spring (43) is placed in cavity on this (41a).
3. leakage-free pressure compensation electromagnetic proportioning valve according to claim 2, it is characterized in that:The dynamic iron core (42) Central upper portion is provided with lower cavity (42a), and the lower end of first spring (43) is placed in the lower cavity (42a), and with elder generation The upper surface of guide valve core (5) offsets cooperation.
4. leakage-free pressure compensation electromagnetic proportioning valve according to claim 3, it is characterized in that:The dynamic iron core (42) Section be in "convex" shaped structure, the lower end of the static iron core (41) be provided be adapted with the dynamic iron core (42) lower end it is recessed Slot (41b).
5. leakage-free pressure compensation electromagnetic proportioning valve according to claim 4, it is characterized in that:In the control chamber (2a) Catch (91) is provided with, banking stop (92) is provided with above the catch (91).
6. leakage-free pressure compensation electromagnetic proportioning valve according to claim 5, it is characterized in that:The main valve plug (6) and P Valve port cone match between mouth and through-flow chamber (1a).
7. leakage-free pressure compensation electromagnetic proportioning valve according to claim 6, it is characterized in that:The pressure compensation spool (7) with the valve port cone match of valve body (1) interior sensitive cavity (1b) upper end.
8. leakage-free pressure compensation electromagnetic proportioning valve according to claim 7, it is characterized in that:The spring base (9) is in T Character form structure, the second spring (71) are sheathed on the spring base (9).
9. leakage-free pressure compensation electromagnetic proportioning valve according to claim 8, it is characterized in that:Described valve pocket (2) peripheral hardware It is equipped with valve pocket sealing ring (21).
10. leakage-free pressure compensation electromagnetic proportioning valve according to claim 9, it is characterized in that:Described valve body (1) peripheral hardware It is equipped with valve seals (11) and limit stop ring (12).
CN201711225702.XA 2017-11-29 2017-11-29 Leakage-free pressure compensation electromagnetic proportioning valve Active CN108071621B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201711225702.XA CN108071621B (en) 2017-11-29 2017-11-29 Leakage-free pressure compensation electromagnetic proportioning valve

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CN108071621B CN108071621B (en) 2019-11-15

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1039288A (en) * 1989-07-24 1990-01-31 权宇 Composite control valve of pressure and flow proportional to electric current
CN1050624A (en) * 1989-09-30 1991-04-10 权宇 Fluid pressure and flow controlling valve implemented by pressure sensor and flow correction calculator
US20080295508A1 (en) * 2007-05-31 2008-12-04 Caterpillar Inc. Force feedback poppet valve having an integrated pressure compensator
JP2010121656A (en) * 2008-11-17 2010-06-03 Kayaba Ind Co Ltd Solenoid proportional throttle valve and power steering device
CN202251199U (en) * 2011-10-20 2012-05-30 常德中联重科液压有限公司 Electro-hydraulic proportional combined maneuvering valve
CN103075379A (en) * 2013-01-09 2013-05-01 青神格林维尔流体动力控制技术有限公司 Electric-hydraulic proportional pressure control valve
CN103511377A (en) * 2012-06-19 2014-01-15 上海立新液压有限公司 One-way proportional flow valve
CN104455650A (en) * 2014-09-30 2015-03-25 宁波星箭航天机械有限公司 Pilot electromagnetic valve
CN106640811A (en) * 2016-11-24 2017-05-10 浙江华益精密机械股份有限公司 Leak-tight pressure compensation electric proportional throttle valve
CN106641386A (en) * 2016-11-24 2017-05-10 浙江华益精密机械股份有限公司 Pressure compensation electric proportional seat valve
CN206280319U (en) * 2016-11-24 2017-06-27 浙江华益精密机械股份有限公司 The electric proportional throttle valve of leakage-free pressure compensation

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1039288A (en) * 1989-07-24 1990-01-31 权宇 Composite control valve of pressure and flow proportional to electric current
CN1050624A (en) * 1989-09-30 1991-04-10 权宇 Fluid pressure and flow controlling valve implemented by pressure sensor and flow correction calculator
US20080295508A1 (en) * 2007-05-31 2008-12-04 Caterpillar Inc. Force feedback poppet valve having an integrated pressure compensator
JP2010121656A (en) * 2008-11-17 2010-06-03 Kayaba Ind Co Ltd Solenoid proportional throttle valve and power steering device
CN202251199U (en) * 2011-10-20 2012-05-30 常德中联重科液压有限公司 Electro-hydraulic proportional combined maneuvering valve
CN103511377A (en) * 2012-06-19 2014-01-15 上海立新液压有限公司 One-way proportional flow valve
CN103075379A (en) * 2013-01-09 2013-05-01 青神格林维尔流体动力控制技术有限公司 Electric-hydraulic proportional pressure control valve
CN104455650A (en) * 2014-09-30 2015-03-25 宁波星箭航天机械有限公司 Pilot electromagnetic valve
CN106640811A (en) * 2016-11-24 2017-05-10 浙江华益精密机械股份有限公司 Leak-tight pressure compensation electric proportional throttle valve
CN106641386A (en) * 2016-11-24 2017-05-10 浙江华益精密机械股份有限公司 Pressure compensation electric proportional seat valve
CN206280319U (en) * 2016-11-24 2017-06-27 浙江华益精密机械股份有限公司 The electric proportional throttle valve of leakage-free pressure compensation

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