EP2128454B1 - Valve proportionnelle dotée de moyens de commande précise - Google Patents

Valve proportionnelle dotée de moyens de commande précise Download PDF

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Publication number
EP2128454B1
EP2128454B1 EP20080009759 EP08009759A EP2128454B1 EP 2128454 B1 EP2128454 B1 EP 2128454B1 EP 20080009759 EP20080009759 EP 20080009759 EP 08009759 A EP08009759 A EP 08009759A EP 2128454 B1 EP2128454 B1 EP 2128454B1
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EP
European Patent Office
Prior art keywords
opening
section
passage
valve spool
cross
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Active
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EP20080009759
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German (de)
English (en)
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EP2128454A1 (fr
Inventor
Reinhard Dr. Schwenzer
Gerhard Gommel
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Festo SE and Co KG
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Festo SE and Co KG
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Priority to EP20080009759 priority Critical patent/EP2128454B1/fr
Publication of EP2128454A1 publication Critical patent/EP2128454A1/fr
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Publication of EP2128454B1 publication Critical patent/EP2128454B1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves

Definitions

  • the invention relates to a proportional directional control valve with fine control means, with an axially movable arranged in a control chamber valve spool having an axially on both sides of each control edge limited fürströmaussparung, which is dependent on the position of the valve spool in a position, at least one connected to a feed channel Feed port and at least one outlet opening connected to a discharge channel in a central position at the same time separated from at least one axially intermediate working opening or selectively connect in working positions with variable flow cross-section with this work opening.
  • Proportional directional valves of this kind allow the supply of a consumer with variable flow rates.
  • a connectable to a consumer work opening can be connected by selecting a corresponding working position with either a connected to a pressure source feed duct or leading to the atmosphere or a tank discharge channel, the flow rate is in particular infinitely variable and wherein the valve spool is also positionable in a central position in which he opens the work shut off both the feed channel and the discharge channel.
  • Another example is in document GB 879 986 to find.
  • a problem in the design of proportional directional valves prepares the so-called fine control range, ie the control or specification of very small volume flows. These can be realized by the valve spool is deflected only minimally in one or the other direction from its center position.
  • fine control agents consist here of, for example, triangular or otherwise shaped notches or recesses in the control edges of the valve spool.
  • the fine control means at least one connected on the one hand to the feed channel or with the discharge channel, a throttle cross-section Have defining throttle channel, on the other hand with at least one throttle duct opening such peripherally opens into the control chamber that it is connected in the middle position and in both directions to the center position subsequent further positions of the valve spool with fully enabled throttle cross-section with the fürströmaussparung, and that the fine control means also have at least one fine control opening, the opening cross-section is greater than the throttle cross-section of the throttle channel and communicates on the one hand with the feed channel or the discharge channel, wherein it communicates with that of these two channels, which is not connected to the throttle channel, and on the other hand in the circumferential direction in the control chamber opens, that its open by the valve spool opening cross-section at least in the adjoining directly to the center position adjustment of the valve spool of the Stellun g of the valve spool depends and in the center position of the valve
  • both the feed channel and the discharge channel each associated with at least one fine control opening, although one of them is designed as an opening of a throttle channel, taking place at least in the middle position of the valve spool and taking place in both possible directions of movement fine adjustments of the valve spool a constant throttle cross-section releases over which the fluid - depending on whether the throttle channel to the feed channel or to the Discharge channel is connected - flow at a constant flow rate or can flow.
  • the opening cross-section of the (other) fine control orifice which is a connection between the control chamber and that channel - Supply channel or discharge channel - manufactures that does not communicate directly with the throttle channel.
  • the throttle channel and the fine control opening thus form a pressure divider, whose output pressure in the area around the center position of the valve spool from the minimum to the maximum value changes almost proportionally to the spool position, without any requirements being imposed on the manufacturing tolerances.
  • the valve spool expediently has a small adjustment range which encloses the middle position and can be referred to as a cover region, in which position changes of the valve spool only affect the released opening cross-section of the fine control opening, while the throttle channel is constantly open and both the at least one feed opening and the at least one discharge opening are completely closed are.
  • the fine control means into a throttle channel which is constantly open at least within the entire fine control range and a fine control opening which, within the fine control range, provides a variable opening cross section depending on the position of the valve slide.
  • a throttle channel which is constantly open at least within the entire fine control range
  • a fine control opening which, within the fine control range, provides a variable opening cross section depending on the position of the valve slide.
  • the waiting with a constant throttle cross-sectional throttle passage is suitably connected to the feed channel, so that flows over him a constant volume flow into the control chamber.
  • the fine control port which is nothing more than a variable orifice throttle opening, is connected to the bleed passage in this case.
  • reverse channel assignment is also possible.
  • a plurality of such openings may be arranged around the valve spool, in particular with a uniform distribution.
  • the throttle duct opening is placed on the inner circumference of the control chamber, that the throttle channel is connected except in the middle position in any possible working position with the overflow recess of the valve spool. This results regardless of the position of the valve slide a constant fluid connection to the associated feed channel or discharge channel with a constant throttle cross-section.
  • the valve slide expediently has on both sides, following the overflow recess, a respective cover section defining the associated control edge.
  • a respective cover section defining the associated control edge.
  • the two cover sections are above the respective associated feed opening or discharge opening and cover them from so that the connection to Studentsströmaussparung and consequently to the work opening is interrupted.
  • Such a design is particularly recommended in a so-called hard-sealing valve design, in which the valve slide and the wall of the control chamber without interposed additional sealant, such as rubber-elastic sealing rings, are in direct contact with each other.
  • a calibrated nozzle element manufactured as a separate element can be inserted into the throttle passage.
  • the nozzle element is for example pressed or screwed. It gives the throttle cross-section in particular immutable before.
  • the directional control valve can also be equipped with means for variable specification of the throttle cross-section. For this purpose, it is advisable to turn in the throttle channel from the outside adjustable throttle device. It is expediently integrated into the valve housing of the directional control valve.
  • the at least one fine control opening is expediently arranged in relation to the at least one opening of the feed channel or discharge channel with axial overlap which opens into the control chamber.
  • the at least one feed opening, and / or the at least one work opening and / or the at least one discharge opening are preferably designed with slot-shaped geometry, one realizes the throttle duct opening and the fine control opening in the manner of a hole with particular circular cross section.
  • the two control edges of the valve spool can be formed with an uninterrupted course and require no incorporation of grooves or other recesses. This provides another contribution to reducing manufacturing costs.
  • the proportional directional control valve can also be used as a hydraulic valve, its construction proves to be particularly advantageous, especially with regard to the pneumatic valves used for controlling compressed air, because here the cost pressure is generally higher than in the case of the hydraulic valves produced with smaller tolerances by the manufacturer.
  • the construction according to the invention makes it possible, with greatly reduced production costs, to improve the reproducibility and to reduce the reject rate in production.
  • FIG. 1 shows a longitudinal section through an inventive proportional directional control valve advantageous structure, wherein the valve spool is shown when taking the middle position.
  • proportional directional valve is designed in the embodiment as a pneumatic valve, which is used to control compressed air. Nevertheless, it can also be used as a hydraulic valve for controlling liquid media.
  • compressed air references are therefore to be understood as references to any type of fluid.
  • valve proportional directional control valve 1
  • the simplified hereinafter referred to only as "valve" proportional directional control valve 1 is a continuous valve, with which it is possible to control the fluid supply of a consumer A variable, so that, for example, the consumer side, a pressure control or flow control can be realized.
  • the consumer A can depending on the operating condition of the valve 1 with either a pressure source P or with a pressure sink R - the latter is in a pneumatic valve, the atmosphere and a hydraulic valve a tank - are connected or can simultaneously shut off from the pressure source P and the pressure sink R.
  • the fluid connection to the pressure source P and to the pressure sink R is possible with a continuously variable flow cross-section.
  • the valve 1 has a valve housing 10, on the outside of which a consumer connection 2 which can be connected to the consumer A, a supply connection 3 which can be connected to the pressure source P and a drain connection 4 which can be connected to the pressure sink R are arranged.
  • connecting means such as threads or connectors allow the fluid-tight connection of leading away from the valve 1 fluid lines.
  • valve housing 10 In the interior of the valve housing 10, an elongated, preferably circular cylindrical contoured control chamber 5 is formed.
  • the adjusting movement 7 and the achievable positioning of the valve slide 6 is by means of an electrically actuated Drive means 12 of the valve 1 causes, which is grown in the embodiment in the axial extension of the control chamber 5 the front side of the valve housing 10.
  • proportional magent that is to say an electromagnet which, when electrically driven, effects a displacement of its armature and of the valve slide 6 coupled with it in a manner proportional to the applied voltage.
  • the valve housing 10 is suitably designed in several parts. It has an outer body 13 having the connections 2, 3, 4 and a guide sleeve 15 defining the control chamber 5 and inserted in a receptacle 14 of the outer body 13 with a seal.
  • valve housing 10 a one-piece design of the valve housing 10 would be possible.
  • the exemplary valve 1 is designed as a 3/3-way proportional valve. However, it could also have a different valve functionality, in particular a 4/3 functionality or a 5/3 functionality.
  • control chamber 5 opens via a circumferentially arranged working opening 16, a valve housing 10 passing through, leading to the load port 2 working channel 22 a.
  • the working opening 16 is flanked at an axial distance by an axially disposed on this side feed opening 17 and an axially beyond the discharge opening 18.
  • the feed opening 17 and the discharge opening 18 are like the working opening 16 on the valve slide 6 enclosing peripheral surface 25 of the control chamber 5 is formed.
  • the feed opening 17 communicates with the feed connection 3 via a feed channel 23 passing through the valve housing 10, and the discharge opening 18 communicates with the discharge connection 4 via a discharge passage 24 passing through the valve housing 10.
  • one of the three passages 22, 23, 24 belongs to the guide sleeve 15 enclosing annular chamber 28, which ensures the required fluid connection regardless of what angle of rotation alignment the guide sleeve 15 is inserted into the receptacle 14.
  • the three openings 16, 17, 18 expediently each have a slot-shaped geometry whose longitudinal extension coincides with the circumferential direction of the control chamber 5. Accordingly, they each extend a little way in the circumferential direction of the control chamber 5. Conveniently, of each of these openings 16, 17, 18 a plurality of existing around the valve spool 6 around in particular uniform distribution in the control chamber 5, to compensate for the to achieve radially acting on the spool pressure forces.
  • the other openings are in FIG. 1 not visible, since they are partly covered by the valve spool 6 and partly lie above the plane of the drawing. All similar openings are expediently placed at the same axial height in the axial direction of the longitudinal axis 8 and have expediently with each other the same cross section. If, in the following, one of these openings 16, 17, 18 is mentioned, this always means all similar openings.
  • the valve slide 6 has two axially spaced-apart longitudinal sections, which are referred to below as the first and second cover section 26, 27 and which are contoured circular cylindrical, wherein its outer diameter the inner diameter of the control chamber 5 corresponds, so that they rest on the peripheral surface 25 of the control chamber 5 slidably and with sealing contact.
  • the valve slide 6 can be positioned in a mid-position shown in the drawing, in which the first cover section 26 covers the feed opening 17 and at the same time the second cover section 27 covers the discharge opening 18. The feed opening 17 and the discharge opening 18 is thus closed and the working opening 16 is separated both from the feed opening 17 and from the discharge opening 18.
  • the two cover sections 26, 27 are bounded on the axially mutually facing sides by a first or second control edge 32, 33.
  • Each control edge 32, 33 extends continuously around the valve spool 6 around and has no recesses or other interruptions.
  • each control edge 32, 33 is contoured circular.
  • the working opening 16 is arranged on the peripheral surface 25 so that it is in any position of the valve spool 6 with the overflow recess 35 unrestricted in communication.
  • the valve spool 6 can be moved in one or the other axial direction. In this way, it can be positioned in working positions in which - depending on the adjustment direction - either the feed opening 17 or the discharge opening 18 is still covered and closed by the associated cover section 26 or 27, while at the same time the other of these two openings 17, 18 is released, because the associated control edge 32, 33 moves over them.
  • the released opening cross-section is proportional to the displacement of the valve spool 6.
  • the working opening 16 can be connected with either continuously variable flow cross-section with the feed opening 17 or the discharge port 18 to supply the connected consumer A pressure medium or to discharge pressure medium from the consumer A.
  • the shut-off of the feed opening 17 and discharge opening 18 of the control chamber 5 is advantageously carried out without rubber elastic sealing means and solely by the direct contact between the outer surface of the cover sections 26, 27 and the radially facing peripheral surface 25 of the control chamber 5. So it is a hard-sealed design, which is characterized by a special low friction and ease of movement. Nevertheless, it would be possible in principle to provide additional sealing elements on the valve slide 6 and / or on the valve housing 10, in particular sealing rings.
  • the valve 1 is equipped with special fine control means 37.
  • the fine control means 37 favor in a special way the series production of the valve 1, because they allow to ensure substantially equal characteristic curves in all valves without excessive tolerance requirements. This applies above all to the characteristic ranges which follow directly on the zero crossing (middle position) on this side and on the other side, ie in the fine control ranges in which a very exact and at the same time fine metering of the volume flows is desired.
  • the fine control means 37 define a fluidic pressure divider composed of a throttle passage 42 and a fine control port 43.
  • the throttle channel 42 is connected at one end to the feed channel 23 and ends at the other end via a throttle channel opening 44 in the region of the peripheral surface 25 in the control chamber 5 a.
  • the throttle passage opening 44 is arranged at an axial distance from the feed opening 17 in such a way that it communicates fully with the overflow recess 35 when the valve slide 6 assumes the center position shown and also when the valve slide 6 from the middle position in one or the other direction is deflected into subsequent positions.
  • the throttle passage 42 defines a flow area referred to as throttle area, which is the fluid in the said valve spool positions constantly available, so that the pressure medium in the middle position of the valve spool 6 with a small but constant flow rate - through the throttle passage 42 through - from the feed channel 23rd can flow into the overflow recess 35.
  • the throttle cross-section is much smaller than that at shared feed opening 17 through the feed opening 17 defined flow cross-section.
  • the fine control port 43 is arranged in the region of the discharge opening 18, wherein it establishes a connection between the discharge channel 22 and the control chamber 5.
  • the fine control port 43 forms a fluidic communication between the bleed passage 24 and the control chamber 5 parallel to the discharge port 18.
  • the particular of the fine control port 43 is however, in that their cross-section is greater than the throttling channel 42 provided by the throttle cross-section and that it is arranged so that it is partially covered in the middle position of the valve spool 6 of the second cover 27 such that the released flow cross-section of the fine control orifice 43 at least essentially corresponds to the throttle cross-section of the throttle channel 42.
  • the maximum flow cross-section which can be predetermined by the fine control opening 43 is in any case substantially smaller than the flow cross-section released by the discharge opening 18 when the discharge opening 18 is open.
  • the throttle channel opening 44 is placed so that the throttle cross-section provided by the throttle channel 42 available except in the middle position in each possible working position of the valve spool 6 is completely released.
  • the described placement of the fine control opening 43 ensures that the leakage volume flow flowing into the overflow recess 35 in the middle position via the throttle channel 42 is discharged directly back into the discharge channel 24.
  • the pressure and flow conditions prevailing in the working channel 22 remain at least substantially constant when the valve slide 6 is positioned in the middle position.
  • valve spool 6 If the valve spool 6 is deflected from the central position in one or the other direction, the working pressure prevailing in the working channel 22 changes almost proportionally from the minimum to the maximum value, as long as the valve spool 7 is in a covering area in which the feed opening 17 and the discharge opening 18 are still closed by the cover sections 26, 27.
  • the reaching to the consumer A flow is thus determined in this fine control area practically only from the currently released opening cross section of the fine control opening 43 or more precisely from the cross-sectional difference between this shared opening cross section and the throttle cross section.
  • valve 1 is thus expediently designed so that the valve slide 6 shuts off the feed opening 17 and the discharge opening 18 not only in the middle position, but additionally in this regard in both directions slightly deflected positions, ie in a ver ausen as covering area adjustment range, in which the flow only by the cross-sectional difference between the constantly open throttle cross-section and the currently released Opening cross section of the fine control opening 43 is defined.
  • the assignment of the throttle channel 42 and the fine control port 43 to the feed channel 43 and the discharge channel 24 could also be reversed. In this case would be defined by the throttle passage 42 independent of the position of the valve slide 6 constant Abströmquerites, while on the inflow side, a position-dependent variation of the inflow cross section takes place.
  • the throttle passage opening 44 and the fine control opening 43 are expediently formed like a hole. In the embodiment, they are realized as a hole-like radial wall openings of the guide sleeve 15. To compensate for fluidic pressure forces each could be arranged at the same axial height fine control openings and throttle channel openings.
  • the fine control opening 43 is placed in particular in such a way that there is an axial overlap between it and the discharge opening 18.
  • a calibrated nozzle member 45 for example, as Einpressdüse or as screw-in in the History of the throttle channel 42 is turned on and dashed lines in the drawing is indicated at 45.
  • throttle channel 42 with variably adjustable throttle cross-section. This allows the course of the flow characteristic in the fine control range to be adjusted individually.
  • a throttle channel 42 is exemplarily indicated in phantom in the drawing, in the course of which adjustable throttle device 46 is switched on with regard to the predefinable throttling intensity.
  • valve 1 In the manufacture of the valve 1, it is advantageous that one has to make only a positioning of the valve slide 6 with respect to a fine control opening 43 to adjust the desired characteristic, but not with respect to the throttle channel opening 44, with respect to the only must be ensured that they in the desired adjustment of the valve spool 7 provides a permanent connection to fürströmaussparung 35. If instead one were to resort to two fine control openings with a variable opening cross section, the desired reproducibility, if at all, could only be achieved with significantly reduced manufacturing tolerances.

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

Claims (13)

  1. Valve proportionnelle dotée de moyens de commande précise, avec un tiroir de valve (6) disposé de manière à pouvoir se déplacer dans le sens axial dans une chambre de commande (5), qui présente un évidement de trop-plein (35) délimité dans le sens axial de part et d'autre par une arête de commande respective (32, 33), lequel évidement est en mesure de séparer au moins une ouverture d'alimentation (17) reliée à un canal d'alimentation (23) et au moins une ouverture d'évacuation (18) reliée à un canal d'évacuation (24) dans une position médiane simultanément d'au moins une ouverture de travail (16) disposée au milieu dans le sens axial ou de les relier dans des positions de travail de manière sélective par une section d'écoulement variable à cette ouverture de travail (16), caractérisée en ce que les moyens de commande précise (37) présentent au moins un canal d'étranglement (42) relié d'une part au canal d'alimentation (23) ou au canal d'évacuation (24), définissant une section d'étranglement, lequel canal d'étranglement débouche d'autre part par au moins une ouverture de canal d'étranglement (44) côté périphérie dans la chambre de commande (5) de telle manière qu'il soit relié dans la position médiane et dans d'autres positions contiguës dans les deux sens à la position médiane du tiroir de valve (6) par une section d'étranglement complètement libérée à l'évidement de trop-plein (35), et en ce que les moyens de commande précise (37) présentent en outre au moins une ouverture de commande précise (43), dont la section d'ouverture est plus grande que la section d'étranglement du canal d'étranglement (42) et qui communique d'une part avec le canal d'alimentation (42) ou le canal d'évacuation (24), sachant qu'elle communique avec le canal parmi ces deux canaux (43, 42) qui n'est pas relié au canal d'étranglement (42), et débouche d'autre part côté périphérie dans la chambre de commande (5) de telle manière que sa section d'ouverture libérée par le tiroir de valve (6) dépende de la position du tiroir de valve (6) au moins dans la zone de réglage, directement contiguë à la position médiane, du tiroir de valve (6) et corresponde dans la position médiane du tiroir de valve (6) au moins sensiblement à la section d'étranglement du canal d'étranglement (42).
  2. Valve proportionnelle selon la revendication 1, caractérisée en ce qu'au moins une ouverture de canal d'étranglement (44) est disposée de telle manière que le canal d'étranglement (42) soit relié dans chaque position de travail du tiroir de valve (6) en permanence par une section d'étranglement complètement libérée à l'évidement de trop-plein (35).
  3. Valve proportionnelle selon la revendication 1 ou 2, caractérisée en ce que l'ouverture d'alimentation (17), l'ouverture d'évacuation (18), l'ouverture de canal d'étranglement (44) et l'ouverture de commande précise (43) sont placées de sorte que le tiroir de valve (6) puisse être positionné de manière variable dans une zone de recouvrement contenant la position médiane, dans laquelle zone non seulement l'ouverture d'alimentation (17) mais aussi l'ouverture d'évacuation (18) sont obturées, alors que la section d'étranglement du canal d'étranglement (42) est en permanence complètement libérée et la section d'ouverture libérée de l'ouverture de commande précise (43) dépend de la position du tiroir de valve (6).
  4. Valve proportionnelle selon la revendication 1 ou 3, caractérisée en ce que respectivement une section de recouvrement (26, 27) définissant l'arête de commande associée (32, 33) du tiroir de valve (6) se raccorde de part et d'autre dans le sens axial à l'évidement de trop-plein (35), laquelle section recouvre complètement au moins en position médiane l'ouverture d'alimentation (17) ou ouverture d'évacuation (18) qui lui est associée respectivement, disposée sur la périphérie de la chambre de commande (5).
  5. Valve proportionnelle selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le canal d'étranglement (42) est équipé d'un élément de buse (45) pour la prescription de la section d'étranglement souhaitée.
  6. Valve proportionnelle selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le canal d'étranglement (42) présente un dispositif d'étranglement réglable (46) pour la prescription variable de la section d'étranglement souhaitée.
  7. Valve proportionnelle selon l'une quelconque des revendications 1 à 6, caractérisée en ce que l'ouverture de commande précise (43) est disposée de sorte qu'un chevauchement axial se présente entre celle-ci et au moins une ouverture du canal d'alimentation (23) ou canal d'évacuation (24) qui lui est relié.
  8. Valve proportionnelle selon l'une quelconque des revendications 1 à 7, caractérisée en ce qu'au moins une ouverture d'alimentation (17) et/ou au moins une ouverture de travail (16) et/ou au moins une ouverture d'évacuation (18) présente une géométrie en forme de fente avec une étendue longitudinale coïncidant avec le sens périphérique de la chambre de commande (5).
  9. Valve proportionnelle selon l'une quelconque des revendications 1 à 8, caractérisée en ce qu'au moins une ouverture de canal d'étranglement (44) et/ou au moins une ouverture de commande précise (43) est réalisée comme un perçage.
  10. Valve proportionnelle selon l'une quelconque des revendications 1 à 9, caractérisée en ce que les deux arêtes de commande (32, 33) du tiroir de soupape (6) présentent chacune un déroulement ininterrompu dans le sens périphérique du tiroir de valve (6).
  11. Valve proportionnelle selon l'une quelconque des revendications 1 à 10, caractérisée en ce que le tiroir de valve (6) et la paroi de la chambre de commande (5) sont directement en contact étanche l'un avec l'autre sans moyen d'étanchéité supplémentaire disposé au milieu.
  12. Valve proportionnelle selon l'une quelconque des revendications 1 à 11, caractérisée en ce qu'au moins un canal d'étranglement (42) est relié au canal d'alimentation (23) et au moins une ouverture de commande précise (43) est reliée au canal d'évacuation (24).
  13. Valve proportionnelle selon l'une quelconque des revendications 1 à 12, caractérisée par une configuration comme valve pneumatique servant à la commande d'air comprimé.
EP20080009759 2008-05-29 2008-05-29 Valve proportionnelle dotée de moyens de commande précise Active EP2128454B1 (fr)

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EP20080009759 EP2128454B1 (fr) 2008-05-29 2008-05-29 Valve proportionnelle dotée de moyens de commande précise

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EP20080009759 EP2128454B1 (fr) 2008-05-29 2008-05-29 Valve proportionnelle dotée de moyens de commande précise

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EP2128454A1 EP2128454A1 (fr) 2009-12-02
EP2128454B1 true EP2128454B1 (fr) 2011-12-21

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CN103234061A (zh) * 2013-05-15 2013-08-07 湖州湖锻机电科技有限公司 一种陶瓷阀芯气动比例阀

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB879986A (en) * 1957-03-05 1961-10-11 Sigma Instr Co Ltd Improvements in or relating to pneumatic or hydraulic relay units
HU195290B (en) * 1985-03-15 1988-04-28 Finoszerelvenygyar Control valve for double-acting pneumatic working cylinders
US4741364A (en) * 1987-06-12 1988-05-03 Deere & Company Pilot-operated valve with load pressure feedback

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