EP0230392B1 - Distributeur de fluide hydraulique sous pression - Google Patents

Distributeur de fluide hydraulique sous pression Download PDF

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Publication number
EP0230392B1
EP0230392B1 EP87400105A EP87400105A EP0230392B1 EP 0230392 B1 EP0230392 B1 EP 0230392B1 EP 87400105 A EP87400105 A EP 87400105A EP 87400105 A EP87400105 A EP 87400105A EP 0230392 B1 EP0230392 B1 EP 0230392B1
Authority
EP
European Patent Office
Prior art keywords
spool
bore
recesses
situated
hydraulic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87400105A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0230392A1 (fr
Inventor
Krikor Constantinian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rexroth Sigma SA
Original Assignee
Rexroth Sigma SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rexroth Sigma SA filed Critical Rexroth Sigma SA
Priority to AT87400105T priority Critical patent/ATE52576T1/de
Publication of EP0230392A1 publication Critical patent/EP0230392A1/fr
Application granted granted Critical
Publication of EP0230392B1 publication Critical patent/EP0230392B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve
    • Y10T137/86694—Piston valve
    • Y10T137/86702—With internal flow passage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87177—With bypass
    • Y10T137/87185—Controlled by supply or exhaust valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87233—Biased exhaust valve
    • Y10T137/87241—Biased closed

Definitions

  • the present invention relates to improvements made to hydraulic pressure fluid distributors, intended to be stacked against other similar distributors, comprising a distributor body provided with at least one pressure fluid inlet orifice, at least a fluid return orifice to a reservoir, two orifices for connection to a hydraulic device or component, and a drawer capable of sliding in a bore of the distributor body, the body and the drawer having passages and / or pipes and / or grooves arranged so as to cooperate with a view to establishing the desired connections or closings of the different orifices of the body of the distributor according to the position occupied by the drawer from among at least three possible positions, namely a direct position, a neutral position and a reverse position, and possibly a fourth position or blurred position, the body further comprising a transverse channel extending from one face of the distributor body, intended to serve as a support in the stack, to another parallel face, this channel being combined with at least one pressure selector in order to transmit, downstream, the strongest of two pressures constituted respectively by the pressure upstream
  • Hydraulic distributors of the aforementioned type are well known in the state of the art. However, their arrangements are such that they do not lend themselves to diversified embodiments, that is to say the addition of auxiliary devices to a basic structure without it being possible to avoid designing specific bodies for each embodiment and therefore without it being possible to achieve useful standardization, even necessary to facilitate the side-by-side association, or stacking, of several distributors to constitute a complex hydraulic control unit. In addition, due to this diversification of constructions, the manufacturing costs are high and the keeping of stocks is complicated.
  • the object of the invention is essentially to remedy these drawbacks of prior hydraulic distributors and to propose a distributor structure which better meets the various requirements of the practice, in particular by proposing a distributor structure which lends itself to the constitution of various modes of realization starting from the same basic body, or at least with the constitution of various embodiments having principal dimensions and compatible layouts allowing an easy stacking of several distributors, and, in all cases, by proposing arrangements which significantly reduce manufacturing costs and reduce the number of spare parts to keep in stock, hence also a reduction in maintenance costs.
  • the arrangement which has just been described constitutes the basic structure which, using the same distributor body, allows the production of a three-position or four-position distributor by an appropriate choice of the drawer: work of a fourth blurred position is carried out without elongation of the distributor body, which was not possible with the arrangements hitherto retained for the prior distributors.
  • the distributor body a complex part which is difficult to manufacture and therefore expensive, can thus be produced in a much larger quantity and the amortization of the tools required is faster; in addition, from a maintenance point of view, this also results in a simplification of the keeping of stocks, and therefore a reduction in maintenance costs.
  • the two connection orifices are located on the same face of the dispenser (or first main face) other than the two abovementioned faces bearing in the stack and other than the two end faces between which extends the above bore; the two corresponding conduits connecting the orifices with the two second recesses, respectively, extend in the portion of the body of the distributor located between said first main face and the bore and the intake orifice; and the corresponding conduits connecting the latter to the aforesaid first recess are located in the portion of the body of the dispenser located between the bore and the second main face opposite to the aforementioned first main face.
  • a hydraulic balance arrangement known per se: a hydraulic distributor with balance is thus produced, with three or four positions of the drawer, stackable with a dispenser of one of the two basic types mentioned above.
  • connection orifices is provided with a mechanically controlled valve: a hydraulic distributor is thus provided equipped with one or two mechanically controlled valves, with or without balance, with three or four drawer positions.
  • connection orifices is provided with a valve with hydraulic control: a hydraulic distributor is thus provided equipped with one or two valves with hydraulic control, with or without balance, with three or four drawer positions.
  • valve with mechanical or hydraulic control and its control means are arranged in the portion of the distributor body located between the bore and the first main face of the distributor body: the main dimensions of the distributor body can thus be kept, and it is possible to stack a distributor thus arranged with one or other of the aforementioned distributors according to the invention, to form hydraulic control units grouping, without problem d 'assembly and dimensions, distributors performing various functions.
  • the distributor D 1 comprises a body 1 provided with an orifice P for admission of the pressurized fluid (constituted in the form of a channel passing through the body 1 and opening on the two faces 2 and 3 of said body serving j support when stacking several distributors side by side), at least one orifice T (not visible in the figures) for the return of the fluid to a reservoir (not shown felt), two orifices A, B, for connection to a hydraulic device or component (not shown), and a drawer 4 capable of sliding in a bore 5 of the body 1; the bore 5 passes longitudinally through the body 1 and opens onto two opposite faces, or end faces 6, 7 thereof.
  • the body 1 and the drawer 4 have passages and / or pipes and / or grooves arranged so as to cooperate with a view to establishing the desired connections or closings of the various orifices of the body of the dispenser according to the position. occupied by the drawer.
  • the arrangements specific to the invention of these passages and / or pipes and / or grooves will be indicated below.
  • the body 1 comprises a transverse channel 8 extending between the bearing faces 2 and 3 and combined with at least one pressure selector S making it possible to transmit, downstream, the stronger of two pressures constituted respectively by the pressure upstream of the channel and a working pressure of the distributor.
  • the channel 8 opens into a cavity, hollowed out in the corresponding face of the body, that is to say the cavity 9 on the face 2 and the cavity 10 on the face 3.
  • the positioning of the cavities on the faces support 2 and 3 is such that, during the stacking of two distributors, the cavity 9 of one and the cavity 10 of the other cooperate to form a chamber in which is housed a shutter member 11, in the form cylinder, suitable for possibly closing the orifice through which opens into the cavity 10 a second channel 12.
  • the selector S or may refer to the patent application FR. 2,540,214 (EP-A-0 116,500).
  • the orifice P can be followed by a chamber 13 housing a non-return valve 14 returned to bear against its seat by a setting nut 15.
  • portion 1 s the portion of the body located between the bore 5 and one of the main faces of the body 1 which is neither an end face. nor a bearing face (face 16 located at the top in FIG. 1), and hereinafter called portion 1 s ) considering fig. 1), and the portion of the body located between the bore 5 and the face 17 opposite the face 16 (at the bottom in FIG. 1), and hereinafter called the lower portion 1, (considering FIG. 1) .
  • the orifice or inlet passage channel P In the lower portion 1, of the body 1 is located the orifice or inlet passage channel P, the chamber 13 and the non-return valve 14 which are associated therewith, as well as a conduit 18 which connects the outlet of the non-return valve -return to a first recess 19, located axially approximately in the central zone of the bore 5 and having a transverse dimension greater than the diameter of the bore 5.
  • connection orifices A and B both open on the main face 16 (located at the top in FIG. 1) and are connected by conduits 20A and 20B, respectively, passing through the upper portion 1 s of the body 1, with second recesses 21A and 21B, located on either side of the first recess 19.
  • the lower portion 1 of the body 1 contains all the organs and conduit relating to the arrival of the hydraulic fluid under pressure, as well as the conduits relating to the load control circuit.
  • the upper portion 1 s of the body 1 contains only the conduits 20A and 20B connecting the connection orifices A and B with the corresponding recesses 21A and 21B: in this way, within the upper portion 1 s of the body 1, of a free volume sufficient to add various auxiliary organs as will be described below.
  • the body 1 of the distributor is traversed by holes 24, opening on its two bearing faces 2 and 3, which always have the same geographical location whatever the type of distributor and which are intended to be crossed by tie rods assembly mechanically bringing together several distributors to constitute a hydraulic control unit.
  • the slide 4 is constituted by a generally cylindrical member of revolution mounted to slide in the bore 5.
  • the drawer 4 is hollowed out with a smaller diameter in two zones or grooves 25 and 26, axially spaced from one another and situated approximately at the right of the second recesses 21A and 22A, respectively, when the drawer 4 is in the neutral position as shown in fig. 1.
  • these two grooves 25 and 26 separate three zones having the nominal diameter of the drawer, namely a central zone 27 situated approximately opposite the first recess 19 and two end zones 28 and 29, respectively towards the end faces 5 and 6, located approximately opposite the third and fourth recesses and beyond (in the neutral position of the drawer shown in fig. 1).
  • Progressivity notches 30 are provided in a manner known per se at the ends of zones 27, 28 and 29 in order to eliminate jolts and improve the progressiveness of the command.
  • the internal volume of this cover 31 is connected, by a channel 33 drilled in the upper region 1 s of the body 1, to the third recess T l .
  • the slide 4 is pierced with an axial channel 34 extending longitudinally over substantially the length of the end zone 28.
  • an axial channel 34 extending longitudinally over substantially the length of the end zone 28.
  • a first radial channel 35 located approximately at the level of the fourth recess 22
  • a second radial channel 36 located approximately at the level of the third recess T l .
  • the third recess T 2 also communicates with a channel 37 opening onto the end face 6, without however, in the example shown, this communication being operational taking into account the provisions associated adopted.
  • the slide 4 is pierced with an axial channel 40 extending longitudinally over substantially the length of the end zone 29.
  • a first radial channel 41 situated approximately at the level of the fourth recess 22 2 and a second radial channel 42 located approximately at the level of the third recess T 2 .
  • the second radial channel 42 can each be formed from one or more radial orifices preferably situated in the same radial plane.
  • the free end of the drawer 4 is provided with a hole 43 for fixing the drawer to an appropriate actuating member (not shown).
  • the letters N, D and M locate the axial positions of the center of this hole 43 when the drawer 4 is respectively in the neutral position or in an extreme functional position.
  • the load control circuit (conduit (23) is connected to the return orifice T via the axial channels 34 and 40 of the drawer, so the selector S is in the closed position.
  • the central zone 27 isolates the recesses 21A and 19, while the groove 26 overlaps the recesses 19 and 21B and that the groove 25 overlaps the recesses T 1 and 21A. In other words, a communication is established between the orifices P and B, on the one hand, and between the orifices A and T, on the other hand.
  • the radial channels 35 and 36 are closed, while the radial channel 42 communicates with the recess 21 B and the radial channel 41 with the recess 22 2 .
  • the load control circuit (conduit 23) therefore receives the pressure applied to the load, which is applied to the selector S, the shutter member 11 of which is positioned to transmit upstream the higher pressure of the two pressures to which it is subjected.
  • the drawer moved to its position M would establish a communication between the orifices P and A, on the one hand, and a communication between the orifices B and T, on the other hand, with transmission of the pressure applied to the load to the load control circuit via the radial channel 36 in communication with the visible 21A, the axial channel 34 and the radial channel 35 in at least partial communication with the recess 22 1 .
  • FIG. 6 represents a distributor D2 with four positions.
  • the structure of the distributor D 2 is identical to that of the distributor D, FIGS. 1 to 4 (and the same numerical references are kept to designate the same elements in FIG. 6), except that a flange 44, similarly nominal diameter that the zones 27, 28 and 29 of the drawer, is situated approximately in a central region of the groove 26.
  • the operation of the distributor D 2 is identical to that of the distributor D i with regard to the three positions N, D and M.
  • the distributor D 2 in FIG. 6 can occupy a fourth position F, or blur position, located to the left of position D. It is in this position F that the distributor D 2 is shown in FIG. 6.
  • the central zone 27 of the drawer isolates the recesses 21A and 19 and the flange 44 isolates the recesses 19 and 21B: no supply of P to A or to B is therefore possible.
  • the orifices A and T are joined by the groove 25 making the recesses T, and 21A communicate, while the orifices B and T are joined by the radial channel 42, the axial channel 40 and the radial channel 41 making the recesses B and T 2 .
  • the load control circuit (conduit 23) is then connected with the orifice T because the radial channel 35 is in communication with the interior volume of the cover 31, itself connected to the recess T 1 via the conduit 33 .
  • FIG. 7 there is shown a distributor D 3 equipped with such a balance BAL, per se known, located in the lower portion 1, of the body 1 which is slightly enlarged for this purpose, (down in FIG. 7) this in prejudice to the ability of the distributor D 3 to be incorporated in a stack.
  • an elongated chamber 45 is provided, for example with an axis parallel to the bore 5. Inside the chamber 45 is disposed a movable valve 46 held in abutment, by a flange 47 that it presents, against a seat 48 under the action of a calibration spring 49.
  • the seat 48 divides the chamber 45 into two parts: a chamber part 50 (to the left of the seat in FIG. 7), housing the spring 49, is in communication with the conduit 23 of the charge control circuit by a connection channel 51; a chamber part 52 (to the right of the seat in FIG. 7) is in communication with the first recess 19 by a conduit 53.
  • valve 46 has a cylindrical tail 54, engaged in the chamber part 52 which acts as a movable shutter for the orifice opposite a connection 55 with the orifice P.
  • a radial bore 56 places the external surface of the tail 54 in communication with an internal bore open towards the chamber part 52.
  • the distributor D 3 is equipped with two mechanically controlled valves, per se known, associated respectively with the connection orifices A and B.
  • conduit 20A is shaped to retain a mechanically controlled valve 57 whose body 58 is supported, by a flange 59, on a seat 60 of the body 1.
  • a finger 61 retained slidingly in the body 1, at its free end which cooperates with the bottom of the groove 25 of the drawer 4, which plays the role of a linear cam with variable profile (its left portion 25 ′ has a smaller transverse dimension than that of its right portion 25 ").
  • the opposite end of the finger 61 is engaged in a channel 62 of the body 58 of the valve 57 and can cooperate with a ball 63 closing the orifice of this channel, by being pushed back by a spring taring 64.
  • a make-up valve 65 -in itself known- which comprises a movable shutter 66 displaceable against the force exerted by a setting spring 67 to gradually discover an orifice 68 for communication with T i , which make-up valve 65 is shown on the left in FIG. 7, between the conduit 20A (in its zone situated between the orifice A and the valve 57) and the recess T l .
  • a secondary pressure limiting valve 69 known per se - which is shown on the right in FIG. 7 in association with orifice B.
  • the operating mode of the distributor D 3 arranged in accordance with the invention and equipped with one or two valves 57, and possibly with a make-up valve 65 and a secondary pressure limiting valve, is understandable for the skilled in the art and will not be explained further.
  • the duct 20A which is associated with it is shaped to house a hydraulically controlled valve 70A, the movable member 71 of which is provided with an axial bore 72 in communication, on the one hand , with the rear of the housing of the member 71 and, on the other hand, with the orifice A; the movable member is, in the absence of antagonistic efforts, return to rest against its seat by a return spring 73.
  • the hydraulic control valve 70B has the same arrangement, and the two valves 70A and 70B are coaxial, parallel to bore 5 of drawer 4.
  • the conduits 20A and 20B are, in their respective parts in communication with the second recesses 21A and 21 B, joined by a bore 74 substantially parallel to the bore 5 and coaxial with the housings of the valves 70A and 70B.
  • the substantially middle part of the bore 74 is connected, by a conduit 75, to a recess 76 of the bore 5 located between the recesses 19 and 21 B.
  • In the sections of the bore 74 located on either side of the conduit 75 are arranged respectively two pistons 77A and 77B.
  • the cover 31 may also contain a mechanical locking device (not shown) which mechanically blocks the drawer 4 in the functional positions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Fluid-Driven Valves (AREA)
EP87400105A 1986-01-17 1987-01-16 Distributeur de fluide hydraulique sous pression Expired - Lifetime EP0230392B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87400105T ATE52576T1 (de) 1986-01-17 1987-01-16 Verteiler fuer hydraulische fluessigkeiten unter druck.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8600632A FR2593265B1 (fr) 1986-01-17 1986-01-17 Distributeur de fluide hydraulique sous pression
FR8600632 1986-01-17

Publications (2)

Publication Number Publication Date
EP0230392A1 EP0230392A1 (fr) 1987-07-29
EP0230392B1 true EP0230392B1 (fr) 1990-05-09

Family

ID=9331216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400105A Expired - Lifetime EP0230392B1 (fr) 1986-01-17 1987-01-16 Distributeur de fluide hydraulique sous pression

Country Status (7)

Country Link
US (1) US4782859A (enExample)
EP (1) EP0230392B1 (enExample)
JP (1) JPS62224776A (enExample)
AT (1) ATE52576T1 (enExample)
DE (1) DE3762653D1 (enExample)
ES (1) ES2015956B3 (enExample)
FR (1) FR2593265B1 (enExample)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802672C2 (de) * 1988-01-29 1993-12-16 Danfoss As Hydraulisches Steuerventil mit Druckfühleinrichtung
JPH0716943Y2 (ja) * 1989-01-27 1995-04-19 東芝機械株式会社 方向制御弁
JPH07103882B2 (ja) * 1989-03-22 1995-11-08 株式会社小松製作所 圧力補償付液圧弁
JPH031383U (enExample) * 1989-05-30 1991-01-09
JP3549126B2 (ja) * 1994-08-05 2004-08-04 株式会社小松製作所 方向制御弁
US5655751A (en) * 1994-09-29 1997-08-12 Samsung Heavy Industries Co., Ltd. Oil drain device for valve spool cap
US5765594A (en) * 1996-04-02 1998-06-16 Danfoss A/S Hydraulic control valve
DE19640103C2 (de) * 1996-09-28 2000-12-07 Danfoss Fluid Power As Nordbor Steuerventil
DE19715021A1 (de) * 1997-04-11 1998-10-15 Rexroth Mannesmann Gmbh Hydraulische Steueranordnung zur Druckmittelversorgung eines ersten und eines zweiten hydraulischen Verbrauchers
US5992454A (en) * 1998-07-21 1999-11-30 Eaton Corporation Lower and float capability in four position control valve
KR100512423B1 (ko) * 2001-08-20 2005-09-07 현대자동차주식회사 유압제어용 스풀밸브
US6964281B2 (en) * 2003-02-07 2005-11-15 Husco International Inc. Multiple hydraulic spool valve assembly with a monolithic body
DE10325294A1 (de) * 2003-06-04 2004-12-23 Bosch Rexroth Ag Hydraulische Steueranordnung
DE10336334B3 (de) * 2003-08-08 2005-08-04 Cnh Baumaschinen Gmbh Hydraulisches Steuersystem für Baumaschinenen, insbesondere für Bagger
US7021332B2 (en) * 2004-03-26 2006-04-04 Husco International, Inc. Hydraulic valve section with reduced bore distortion
US7308848B2 (en) * 2004-12-02 2007-12-18 Sarcos Investments Lc Pressure control valve having intrinsic feedback system
US7284471B2 (en) * 2004-12-02 2007-10-23 Sarcos Investments Lc Pressure control valve having intrinsic mechanical feedback system
DE102004063044B4 (de) * 2004-12-22 2006-12-21 Sauer-Danfoss Aps Hydraulische Steuerung
EP2122185A1 (en) 2007-02-28 2009-11-25 Raytheon Sarcos, LLC Antagonistic fluid control system for active and passive actuator operation
EP2122186A1 (en) * 2007-02-28 2009-11-25 Raytheon Sarcos, LLC Fluid control system having selective recruitable actuators
US7779863B2 (en) * 2007-06-29 2010-08-24 Raytheon Sarcos, Llc Pressure control valve having an asymmetric valving structure
DE102009021103A1 (de) * 2009-05-13 2010-11-18 Hydac Filtertechnik Gmbh Hydraulische Ventilvorrichtung
JP6338428B2 (ja) * 2014-04-11 2018-06-06 Ｋｙｂ株式会社 バルブ構造
US10590962B2 (en) * 2016-05-16 2020-03-17 Parker-Hannifin Corporation Directional control valve
IT201600127801A1 (it) * 2016-12-16 2018-06-16 Walvoil Spa Servocomando idraulico ad area differenziale
JP7116584B2 (ja) * 2018-05-07 2022-08-10 川崎重工業株式会社 弁装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1395442A (fr) * 1964-05-22 1965-04-09 Commercial Shearing Distributeur de contrôle de fluide
US3742982A (en) * 1971-07-26 1973-07-03 Borg Warner Control valve
US3746040A (en) * 1972-04-19 1973-07-17 Parker Hannifin Corp Directional control valve
US4352375A (en) * 1980-04-14 1982-10-05 Commercial Shearing, Inc. Control valves
FR2540214B1 (fr) * 1983-01-27 1986-03-14 Rexroth Sigma Perfectionnements apportes aux distributeurs de fluide
FR2567233B1 (fr) * 1984-07-03 1986-12-12 Bennes Marrel Tiroir assiste pour la compensation de pression dans un distributeur hydraulique

Also Published As

Publication number Publication date
US4782859A (en) 1988-11-08
FR2593265B1 (fr) 1988-04-22
EP0230392A1 (fr) 1987-07-29
JPS62224776A (ja) 1987-10-02
DE3762653D1 (de) 1990-06-13
JPH0461991B2 (enExample) 1992-10-02
ATE52576T1 (de) 1990-05-15
ES2015956B3 (es) 1990-09-16
FR2593265A1 (fr) 1987-07-24

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