CN105673623B - Polygon overflow system - Google Patents

Polygon overflow system Download PDF

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Publication number
CN105673623B
CN105673623B CN201511023328.6A CN201511023328A CN105673623B CN 105673623 B CN105673623 B CN 105673623B CN 201511023328 A CN201511023328 A CN 201511023328A CN 105673623 B CN105673623 B CN 105673623B
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China
Prior art keywords
overflow
valve
polygon
bypass
valve element
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CN201511023328.6A
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Chinese (zh)
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CN105673623A (en
Inventor
尚耀星
汤洪
焦宗夏
徐远志
吴帅
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Beihang University
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Beihang University
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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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/001—Servomotor systems with fluidic control
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
    • F16L55/055—Valves therefor
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8606—Control during or prevention of abnormal conditions the abnormal condition being a shock

Abstract

The application is related to a kind of polygon overflow system, including main oil passage and the polygon overflow pulsation attenuation control system of cam plate；Wherein, the polygon overflow pulsation attenuation control system of cam plate includes transmission device, polygon overflow valve, cam disc and cam lever；Polygon overflow valve includes valve element and valve core housing, so that the bypass overflow inlet of at least one forms overflow ducts with the bypass overflow outlet conducting of at least one；Transmission device is used for band movable valve plug and rotated around rotary shaft；Cam disc coordinates with cam lever, with adjusting spool and the relative position of valve core housing.According to the scheme of the application, by controlling the motion of valve element so that overflow inlet and overflow outlet are engaged to form overflow ducts, the flow pulsation produced in main pipeline can be offset at least partially.

Description

Polygon overflow system
Technical field
The application is related to hydraulic system field, particularly a kind of polygon overflow system.
Background technology
Hydraulic system is many important in Aeronautics and Astronautics, ship etc. with the advantages of its power density is big and anti-loading rigidity is big Industrial department has obtained application widely.As hydraulic system develops to high speed, high pressure, high-power direction, hydraulic energy The vibration and noise problem of source pipe-line system is on the rise, and has become restriction hydraulic system and develops to high pressure, low noise direction Bottleneck.
At present, hydraulic system provides hydraulic energy source using axial plunger pump mostly, because axial plunger pump has output Pressure is high, operating efficiency is high and high reliability.However, axial plunger pump must due to its own structure and operation principle Fluid pulsation can so be produced.Due to inevitably there is liquid resistance inside pump and in pipe-line system, fluid pulsation can cause pressure again Power is pulsed.Harm of the pressure fluctuation to hydraulic energy source pipe-line system, is generally showed in the form of solid liquid interation, that is, pressed Power pulsation produces pipe vibration, pipe vibration influence pressure fluctuation again in turn.It is this due to fluid structurecoupling produce pipe Vibration It is dynamic, it is easy to pipe-line system is produced fatigue rupture and radiated noise.Therefore, hydraulic fluid pulsations are hydraulic energy source pipe-line system knots Structure vibrates the basic origin cause of formation with radiated noise.
Due to the inherent structure and operation principle of axial plunger pump, its oil-absorbing process equally exists discontinuity, this Discontinuity has been resulted in the fuel sucking pipe of hydraulic energy source pipe-line system there is also fluid pulsation, its caused pipeline vibration with Radiated noise problem equally be can not ignore.Therefore, the fluid pulsation in hydraulic system suction ＆ delivery oil hose road is carried out suppressing simultaneously, tool There is very important realistic meaning.
Vibration Active Control due to its adaptive ability it is strong the advantages of, have become pipe-line system fluid pulsation control weight Want developing direction.The active control system of fluid pulsation mainly includes sensor, three parts of controller and actuator.According to work Research at present both at home and abroad to pipe-line system fluid pulsation active control, can be divided into three classes by the difference of dynamic device type：First Class is to utilize the intellectual material actuator being arranged on outside tube wall to produce controling power to tube wall, causes the elastic deformation of tube wall, and then Fluid pulsation ripple is produced in pipeline, is cancelled out each other with original fluid pulsation；Equations of The Second Kind is to utilize the start for acting on fluid Device directly produces fluid pulsation ripple, to offset fluid pulsation original in pipe-line system；3rd class is to produce to overflow using hydraulic valve Flow flow and control original flow pulsation.
The third method is directed to, its feature is summarized as follows：
Fluid pulsation active control based on bypass principle of overflow is applied to the pulsation active control of high-pressure hydraulic, because The power for only needing to export very little for the intellectual material that promotes valve core movement overcomes friction, valve element inertia and hydraulic power, no Need heavy load caused by carrying high-pressure fluid；Further, since throttling formula is understood, after excessive pressure amplification, in liquid The excess flow equal with hydraulic pump pulsating flow can be produced in the case of pressure valve opening very little.Therefore, with fluid actuator Compare, weakening valve energy consumption is lower, volume is smaller.But, traditional Active Control Method based on bypass principle of overflow requires pressure The frequency of electroceramics weakening valve will can get caught up in fluid pulsation frequency, could produce and overflowing that hydraulic pump pulsating flow is cancelled out each other Flow flow.It is well known that fluid pulsation produced by plunger pump includes a variety of sinusoidal frequency compositions, its frequency distribution in fundamental frequency and In its high-order frequency multiplication, these frequencies are directly proportional to the rotating speed of pump.As hydraulic energy system (is particularly airplane hydraulic pressure energy system System) develop to high pressure, big flow direction, the rotating speed of axial plunger pump becomes more and more higher, and this allows for the fundamental frequency of fluid pulsation The working frequency limit of piezoelectric ceramic actuator is reached, its high-order frequency multiplication is even more far away beyond piezoelectric actuator Hz-KHz.Therefore, dashpot frequency range can not meet increasingly increased hydraulic fluid ripple frequency requirement, into traditional base The bottleneck applied in the fluid pulsation Active Control Method of bypass principle of overflow in high-speed hydraulic system.
The content of the invention
The brief overview on the application is given below, so as to provide on the application it is some in terms of basic reason Solution.It should be appreciated that this general introduction is not the exhaustive general introduction on the application.It is not intended to determine the key of the application Or pith, nor intended limitation scope of the present application.Its purpose only provides some concepts in simplified form, with This is used as the preamble in greater detail discussed later.
The main purpose of the application is to provide a kind of polygon overflow system, it is intended to solves technology as described above and asks Topic.
In a first aspect, this application provides a kind of polygon polygon overflow system of overflow system, including main oil passage and The polygon overflow pulsation attenuation control system of cam plate；Wherein, the polygon overflow pulsation attenuation control system of cam plate includes passing Dynamic device, polygon overflow valve, cam disc and cam lever；Polygon overflow valve includes valve element and valve core housing, offer on valve element m it is logical Hole offers n through hole to form bypass overflow outlet to be formed on bypass overflow inlet, valve core housing, valve element is coaxial with valve core housing Set, and valve element rotates around rotary shaft, so that at least one bypass overflow inlet and the bypass overflow outlet guide of at least one It is logical to form overflow ducts；Transmission device is used for band movable valve plug and rotated around rotary shaft；Cam disc coordinates with cam lever, with adjusting spool With the relative position of valve core housing.
In certain embodiments, system also includes motor and hydraulic pump；Motor includes output shaft, and output shaft is used for band Hydrodynamic press pump rotates so that fluid flows into main oil passage through fuel tank；Transmission device is connected to the rotation of output shaft and polygon overflow valve Between rotating shaft, so that valve element is around rotary shaft Periodic Rotating, and within each period of motion, each bypass overflow inlet and each bypass Overflow outlet coordinates conducting once.
In certain embodiments, transmission device includes connecting shaft key.
In certain embodiments, valve element and valve core housing are hollow cylinder, the outer wall of valve element and the inwall of valve core housing It is engaged.
In certain embodiments, each bypass overflow outlet is connected with fuel tank, so as to enter the fluid stream of bypass overflow ducts Enter in fuel tank.
Using the polygon overflow system of the application, multiple overflow outlets are offered on valve core housing and are offered on valve element Multiple overflow inlets, can be with by controlling the motion of valve element so that overflow inlet and overflow outlet are engaged to form overflow ducts The flow pulsation produced in main pipeline is offset at least partially.
In addition, in some embodiments of the present application, controller can control valve element and periodically move, a motion week In phase, multiple overflow ducts can be formed between the valve element and valve core housing of polygon overflow valve so that relatively low in the motion frequency of valve element In the case of the fluid flow that more flow pulsation triggers can be also discharged within a period of motion.
Brief description of the drawings
With reference to explanation below in conjunction with the accompanying drawings to the embodiment of the present application, can be more readily understood that the application more than and its Its objects, features and advantages.Part in accompanying drawing is intended merely to show the principle of the application.In the accompanying drawings, identical or similar Technical characteristic or part will be represented using same or similar reference.
Fig. 1 is the schematic diagram of one embodiment of the polygon overflow system of the application；
Fig. 2 is the polygon overflow valve profile in the axial direction in Fig. 1 and the profile perpendicular to axis direction；
Fig. 3 flows to schematic diagram for the polygon overflow valve of the application in the fluid not in the same time of a cycle；
The example graph for the excess flow that Fig. 4 produces for the polygon overflow valve of the application in a cycle.
Embodiment
Illustrate embodiments herein with reference to the accompanying drawings.Retouched in the accompanying drawing of the application or a kind of embodiment The element and feature that the element and feature stated can be shown in one or more other accompanying drawings or embodiment are combined.Should Work as attention, for purposes of clarity, eliminated in accompanying drawing and explanation known to, those of ordinary skill in the art unrelated with the application Part and processing expression and description.
It is shown in Figure 1, it is the structure chart 100 of one embodiment of the polygon overflow system of the application.
The polygon overflow system of the present embodiment includes main oil passage 10 and the polygon overflow pulsation decay control of cam plate System processed.
Wherein, the polygon overflow pulsation attenuation control system of cam plate includes transmission device 210, polygon overflow valve, cam Disk 230 and cam lever 240.
Polygon overflow valve includes valve element 221 and valve core housing 222.M through hole is offered on valve element 221 to form bypass overflow N through hole is offered on entrance, valve core housing 222 to form bypass overflow outlet, valve element 221 is coaxially disposed with valve core housing 222, and Valve element 221 rotates around rotary shaft, so that the bypass overflow inlet of at least one and the bypass overflow outlet conducting shape of at least one Into overflow ducts.
Transmission device 210 is used for band movable valve plug 221 and rotated around rotary shaft.
Cam disc 230 coordinates with cam lever 220, with adjusting spool 221 and the relative position of valve core housing 222.
It is shown in Figure 2, be the application polygon overflow system in, the profile in the axial direction of polygon overflow valve and Perpendicular to the profile of axis direction.
In polygon overflow valve shown in Fig. 2, m through hole 211 is offered on valve element 210 to form bypass overflow inlet, valve N through hole 221 is offered on core retainer plate 220 to form bypass overflow outlet.Valve element 210 is coaxially disposed with valve core housing 220, and around rotation Rotating shaft rotates, so that the bypass overflow inlet of at least one forms overflow ducts with the bypass overflow outlet conducting of at least one. Herein, m is positive integer, and n is the positive integer more than 1.
When the bypass overflow outlet conducting on one of bypass overflow inlet on valve element 210 and valve core housing 220 is formed During overflow ducts, fluid can flow into overflow ducts from bypass overflow inlet, and through coordinating conducting with the bypass overflow inlet Bypass overflow outlet outflow.
Although it should be noted that Fig. 1 schematically show only 1 bypass overflow inlet (i.e. m=1) and 4 bypasses The situation of overflow outlet (i.e. n=4).But the bypass overflow inlet and the quantity of bypass overflow outlet are only illustrative.Ability Field technique personnel can have after the technical scheme of polygon overflow valve of the embodiment of the present application is obtained according to practical application scene Body sets the quantity of bypass overflow inlet to reach corresponding excess flow to offset flow pulsation.Therefore, no matter in valve element The quantity of the bypass overflow inlet of upper setting, the quantity of the bypass overflow outlet also no matter set on valve core housing, As long as the structure with polygon overflow valve disclosed in the present application, has just been contemplated as falling within the protection domain of the application.
In some optional implementations, valve element 210 is around rotary shaft Periodic Rotating, and within each period of motion, Each bypass overflow inlet coordinates conducting once with each bypass overflow outlet.In these optional implementations, valve element is around rotation Axle one week (360 °) is a period of motion of valve element.
In these optional implementations, due to offering m bypass overflow inlet, and valve core housing 220 on valve element 210 On offer n bypass overflow outlet, and within a period of motion of valve element 210, each bypass overflow inlet with each Bypass overflow outlet and coordinate conducting once.Within a period of motion, timesharing is formed into m × n overflow ducts.So that valve The motion frequency of the cycle movement of core 210 can also produce larger excess flow when relatively low so that into valve element because of flow The fluid produced of pulsing is excluded outside polygon overflow valve through overflow ducts, so as to offset fluid pulsation.
In some optional implementations, valve element 210 and valve core housing 220 can be hollow cylinder, valve element 210 Outer wall is engaged with the inwall of valve core housing 220.
Return with continued reference to shown in Fig. 1, in some optional implementations, polygon overflow system can also include electronic Machine 30 and hydraulic pump 40.
Motor 30 includes output shaft 31, and output shaft 31 is used to drive hydraulic pump 40 to rotate so that fluid is flowed into through fuel tank 50 Main oil passage 10.
Transmission device 210 is connected between the rotary shaft of output shaft 31 and polygon overflow valve, so that valve element 221 is around rotary shaft Periodic Rotating, and within each period of motion, each bypass overflow inlet coordinates conducting once with each bypass overflow outlet.
In some optional implementations, transmission device 210 can for example include connecting shaft key.
In some optional implementations, valve element 221 and valve core housing 222 are outside hollow cylinder, valve element 221 Wall is engaged with the inwall of valve core housing 222.
In some optional implementations, each bypass overflow outlet is connected with fuel tank 50, is led to so as to enter bypass overflow The fluid in road is flowed into fuel tank, so as to weaken into the flow pulsation in the valve element 221 of polygon overflow valve.
So, can be with adjusting spool 221 and valve element by adjusting the relative position of cam disc 230 and cam lever 240 Set 222 and then adjusts the fluid volume that can accommodate of bypass overflow ducts in the relative position of rotary shaft axial direction.
Below, by taking m=1 and n=4 as an example, will be described with reference to Fig. 3 and Fig. 4 the application polygon overflow valve and it is polygon overflow How streaming system weakens the fluid pulsation in main oil passage.
As shown in figure 3, the first moment in the period of motion that Spool rotating is moved, the bypass overflow inlet of valve element 311 form overflow ducts with the connection of the first bypass overflow outlet 321 on valve core housing.
The second moment in the period of motion that Spool rotating is moved, the bypass overflow inlet 311 and valve element of valve element The the second bypass overflow outlet 322 put, which is connected, forms overflow ducts.
The 3rd moment in the period of motion that Spool rotating is moved, the bypass overflow inlet 311 and valve element of valve element The 3rd bypass overflow outlet 323 put, which is connected, forms overflow ducts.
The 4th moment in the period of motion that Spool rotating is moved, the bypass overflow inlet 311 and valve element of valve element The 4th bypass overflow outlet 324 put, which is connected, forms overflow ducts.
Therefore, in the period of motion that Spool rotating is moved, four bypass overflow ducts can not be being formed in the same time.
In Fig. 4, T1For flow pulsation Q in main oil passagedFundamental frequency f1Inverse, T2For the valve element of polygon overflow valve The period of motion.
Assuming that in polygon overflow valve in a period of motion of valve element, valve element at the uniform velocity rotates, and in the period of motion, valve The displacement of core is x.If each bypass overflow inlet in overflow valve is of similar shape, between each adjacent bypass overflow inlet Spacing (angle) is equal, and each bypass overflow outlet in overflow valve is of similar shape, each adjacent bypass overflow outlet Between spacing (angle) it is equal, then within a period of motion of valve element, will produce m × n overflow ducts, each overflow ducts The excess flow Q of generation0It is equal, and each Q0It is uniformly distributed along time shaft.
So, it is assumed that flow pulsation Q in main oil passagedFundamental frequency be f1, in other words, at interval of 1/f1Just produce A raw Qd.Can be by setting period of motion of valve element in polygon overflow valve：
T2=m × n/f1 (1)
So that within a period of motion of valve element, m × n flow pulsation Q can be weakenedd, held so as to substantially reduce The motion frequency of row mechanism and valve element.
Or, work as T2During for fixed value, bypass overflow inlet and/or bypass can also be designed by above-mentioned formula (1) The quantity of overflow outlet, multiple flow pulsation Q are weakened to reach within a period of motion of polygon overflow valvedTechnology effect Really.
Further, it is also possible to which the surge motion control exported by controller instructs to control the phase between valve element and valve core housing To position, to control the volume for the overflow ducts to be formed, and then control to enter the amount (Q of the fluid of each overflow ducts0)。
It should be noted that the excess flow that the polygon overflow valve in Fig. 4 is produced in a cycle is only illustrative. Skill of the those skilled in the art in the polygon overflow pulsation attenuation control system of polygon overflow valve and cam plate for obtaining the application It is contemplated that being overflow by adjusting axial motion control instruction to adjust bypass overflow inlet every time and bypass on the basis of art scheme The flow Q that flow export is generated when turning on0, bypass overflow inlet and bypass overflow are adjusted by adjusting rotary motion control instruction Export the time of conducting.Therefore, the flow Q produced when no matter each bypass overflow inlet is with bypass overflow outlet conducting0Whether Identical, also no matter adjacent bypass overflow inlet twice exports the time interval length turned on bypass overflow, as long as with this Shen Please disclosed polygon overflow valve and the polygon overflow of cam plate pulse the structure of attenuation control system, be just contemplated as falling within the application Protection domain within.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.People in the art Member should be appreciated that invention scope involved in the application, however it is not limited to the technology of the particular combination of above-mentioned technical characteristic Scheme, while should also cover in the case where not departing from the inventive concept, is carried out by above-mentioned technical characteristic or its equivalent feature Other technical schemes formed by any combination.Such as features described above has similar work(with (but not limited to) disclosed herein The technical characteristic of energy carries out technical scheme formed by replacement mutually.

Claims (5)

1. a kind of polygon overflow system, it is characterised in that including main oil passage and the polygon overflow pulsation decay of cam plate Control system；
Wherein, the polygon overflow pulsation attenuation control system of cam plate includes transmission device, polygon overflow valve, cam disc and cam Bar；
The polygon overflow valve includes valve element and valve core housing, offers m through hole on the valve element and bypasses overflow to be formed and enter Mouthful, n through hole is offered on the valve core housing to form bypass overflow outlet, and the valve element is coaxially set with the valve core housing Put, and valve element rotates around rotary shaft, so that the bypass overflow inlet of at least one and the bypass overflow of at least one Outlet conducting forms overflow ducts；
The transmission device is used for band movable valve plug and rotated around rotary shaft, and the transmission device is connected to output shaft and described polygon excessive Between the rotary shaft for flowing valve, so that the valve element is around the rotary shaft Periodic Rotating, and within each period of motion, it is each described Bypass overflow inlet and coordinate conducting once with each bypass overflow outlet；
The cam disc coordinates with the cam lever, with adjusting spool and the relative position of valve core housing.
2. the polygon overflow system according to claim 1, it is characterised in that：
The system also includes motor and hydraulic pump；
The motor includes output shaft, and the output shaft is used to drive the hydraulic pump to rotate so that fluid flows into institute through fuel tank State main oil passage.
3. the polygon overflow system according to claim 2, it is characterised in that：
The transmission device includes connecting shaft key.
4. the polygon overflow system according to claim 2, it is characterised in that：
The valve element and the valve core housing are hollow cylinder, and the inwall of the outer wall of the valve element and the valve core housing matches Close.
5. the polygon overflow system according to claim 1-4 any one, it is characterised in that：
Each bypass overflow outlet is connected with fuel tank, so that the fluid for entering bypass overflow ducts is flowed into the fuel tank.
CN201511023328.6A 2015-12-31 2015-12-31 Polygon overflow system Active CN105673623B (en)

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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
CN112696512B (en) * 2020-12-21 2021-12-14 西安交通大学 Adjustable oil spill valve and diaphragm hydrogen compressor for hydrogenation station

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5081902A (en) * 1989-07-08 1992-01-21 Mannesmann Rexroth Gmbh Apparatus for providing relief to a working chamber
CN201068906Y (en) * 2007-03-12 2008-06-04 蔡民健 Swivel plate type hydraulic change-over valve
CN102506031A (en) * 2011-12-31 2012-06-20 北京航空航天大学 Hydraulic pipeline fluid pulse active inhibition method based on bilateral overflow principle
CN103438243A (en) * 2013-09-24 2013-12-11 淮海工学院 Incremental electro-hydraulic digital flow control valve with double valve cores rotating oppositely
CN104040235A (en) * 2012-01-12 2014-09-10 松下电器产业株式会社 Valve device
CN105202216A (en) * 2015-10-26 2015-12-30 无锡阳工机械制造有限公司 Ball relief valve with two overflow openings

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5081902A (en) * 1989-07-08 1992-01-21 Mannesmann Rexroth Gmbh Apparatus for providing relief to a working chamber
CN201068906Y (en) * 2007-03-12 2008-06-04 蔡民健 Swivel plate type hydraulic change-over valve
CN102506031A (en) * 2011-12-31 2012-06-20 北京航空航天大学 Hydraulic pipeline fluid pulse active inhibition method based on bilateral overflow principle
CN104040235A (en) * 2012-01-12 2014-09-10 松下电器产业株式会社 Valve device
CN103438243A (en) * 2013-09-24 2013-12-11 淮海工学院 Incremental electro-hydraulic digital flow control valve with double valve cores rotating oppositely
CN105202216A (en) * 2015-10-26 2015-12-30 无锡阳工机械制造有限公司 Ball relief valve with two overflow openings

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