US3696710A - Distributor for hydraulic motors - Google Patents

Distributor for hydraulic motors Download PDF

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Publication number
US3696710A
US3696710A US90219A US3696710DA US3696710A US 3696710 A US3696710 A US 3696710A US 90219 A US90219 A US 90219A US 3696710D A US3696710D A US 3696710DA US 3696710 A US3696710 A US 3696710A
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United States
Prior art keywords
distributor
casing
areas
housing
plate
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
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US90219A
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English (en)
Inventor
Aurelio Ortelli
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Riva Calzoni SpA
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Riva Calzoni SpA
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Classifications

    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/04—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members
    • F16K3/06—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members in the form of closure plates arranged between supply and discharge passages
    • F16K3/08—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members in the form of closure plates arranged between supply and discharge passages with circular plates rotatable around their centres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0655—Control therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0435—Particularities relating to the distribution members
    • F03C1/0444—Particularities relating to the distribution members to plate-like distribution members
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/072—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members
    • F16K11/076—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members with sealing faces shaped as surfaces of solids of revolution
    • 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
    • Y10T137/86638—Rotary valve

Definitions

  • ABSTRACT A distributor for hydraulic motors with radially air 'i 91/ ranged pistons including a rotary member located in a :2 gr 23 625 housing in communication with fluid inlet and outlet conduits and having inner passages and sealing means PATENTEDncr 10 m2 SHEEY 1 BF 3 INVENTOR Aurelio ORTELLI Aaufi- AGENT PATENTEDUBT 10 m2 SHEET 2 BF 3 INVENTOR Aurelio ORTELLI PATENTED 10 I 3.696.710
  • the present invention relates to a distributor for hydraulic motors having radially arranged pistons and the like.
  • some distributors for hydraulic motors having radially arranged pistons comprise a member the driving shaft and rotatably mounted in a box-like frame connected to the delivery and discharge conduits or pipes of the working fluid.
  • the said rotary member is provided with passages capable of communicating with the said delivery and discharge conduits with the openings or lights formed in a flat portion of the motor housing, which portion is in tight contact engagement with the relative surface of the said rotary member.
  • the said openings communicate through suitable passages with the spaces or chambers of the radial pistons, thereby the said rotary member effects the desired distribution by putting the same chambers or spaces in communication either with the supply or the discharge conduit according to a preestablished sequence.
  • Such distributors of known type have, however, some drawbacks among which that of giving a reduced efficiency in terms of volumes when the motors operate at high pressures of the working fluid, and at a low number of revolutions.
  • the high pressure of the fluid causes in fact deformations even very small (of the order of hundredth of mm.) in the portion of the motors housing, in contact with the said rotary member. Such deformations are sufficient to cause the opening of passages for the pressure fluid with consequent losses towards the outlet zone.
  • the mechanical efficiency is also reduced in that the said deformations cause a bulging or bending of the motor housing portion adjacent to the said rotating member, and the sliding points are moved away towards the periphery of the member-itself thus increasing the friction forces between the-mechanic elements.
  • the main object of the present invention is that of substantially eliminating the above-mentioned drawbacks which are found in the known systems, by conceiving a distributor for hydraulic motors having radially arranged pistons and the like, capable of maintaining the volumetric and mechanical efficiency at high rate, even when the said motors are operated at high pressure and low speed.
  • Another important object of the invention is that of conceiving a distributor for hydraulic motors having radially arranged pistons which are simple to manufacture, of reliable operation and easy maintenance.
  • a distributor for hydraulic motors having radially arranged pistons which comprises a member rotatably mounted in a box-like frame connected to the supplying and discharge conduits for the working fluid which rotating member is provided with inner passages for the said fluid and is keyed on the driving shaft adjacent to a portion of the housing of the said'motor provided with fluid passages communicating with the chambers or spaces of the said pistons, and it is characterized in that it is provided with a substantially plate-like fluid-tight element arranged between the said portion of the housing and the said rotating member and formed with fluid passages communicating with the said openings, around the said apertures or holes in the plate-like element on the face adjacent to the said portion of housing, depressed surfaces of suitable area being formed, which are delimited by respective seals for the buildingup of counterpressures capable of maintaining the said plate-like element close to the said rotary member substantially upon the whole surface thereof.
  • FIG. 1 is a cross-section view of the distributor according to the invention taken along two passages of the working fluid;
  • FIG. 2 diagrammatically shows in a reduced scale a distributor according to the invention when applied to a hydraulic motor having radially arranged pistons;
  • FIG. 3 is a cross-section view taken along lines III III in FIG. 1;
  • FIG. 4 is a cross-section view taken along lines IV IV in FIG. 1;
  • FIG. 5 illustrates in an enlarged scale a detail in FIG.
  • FIG. 6 is a section view showing deformations occurring in a conventional distributor of known type.
  • FIG. 7 is a section view similar to that in FIG. 1 according to another modification.
  • the distributor 1 consists of a box-like structure or casing 2 acting as a cover, a rotary member 3 mounted in said box-like structure, a ring 12 carrying two concentric gaskets 13, a plate-like element 4 to be secured adjacent to a flat portion 5 of the housing of an hydraulic motor 6 having radially arranged pistons and the like.
  • the rotary member 3 is driven by the driving shaft 7 and comprises two inner passages 8 and 9 which communicate through the gap existing between the member 3 and the box-like structure 2 with two respective passages 10 and 11 formed in the box-like structure 2 and in communication with the supplying and discharge conduits (not shown).
  • the passage 10 communicates with the discharge
  • the passage 11 communicates with the supplying conduit
  • the passage 11 communicates with the discharge conduit thus defining one direction of rotation or the other, respectively.
  • a sorting or divisional ring 12 is coaxially mounted between the rotary member 3 and the box-like structure 2, such a ring being provided with resilient gaskets or seals 13 capable of urging the same against the member 3.
  • the ring 12 is also secured to the box-like structure or frame 2 by means of a pin 14 which prevents the same from rotating but permits slight movements in the axial direction.
  • the box-like structure 2 and the plate-like element 4 are secured to the housing of the motor 6 by means of screws 15.
  • the element 4 is bored in the central portion thereof for the passage of the shaft 7.
  • the rotary member 3 is then provided on the face adjacent to the plate-like element 4 with two arcuated slots or grooves 16 and 17 communicating with the passages 8 and 9, respectively. There are also provided arcuated balance slots or grooves 16a and 170 which communicate through inner passages (not shown) with the groove 16 and the groove 17, respectively.
  • the arrangement is such so that the counterpressures acting from right to left and due to the presence of the grooves l6-l6a and 17-l7a are kept at values lower than that of the forces A and B so as to cause the rotary member 3 to contact the plate-like element 4 always.
  • the counterpressure due to the presence of the grooves 16 and 16a is lower than the force A acting in the reverse direction.
  • the plate-like element 4 will be provided with five holes or bores 18 which will be arranged in alignment with the five conduits 19 provided in the housing of the motor 6 and communicating with the chambers of the pistons.
  • the plate-like element 4 has on the face opposite the motor 6 depressed portions or areas 18a delimited by endless grooves, each of which comprises two concentric arcuated lengths 18b and two radial or substantially radial sections 18c.
  • gaskets or seals 20 whose shape can be other than that illustrated consisting of resilient materials, are arranged and adapted to provide a tight seal between the housing of the motor 6 and the plate-like element 4.
  • counterpressures C are built up (FIG. 5) and act from right to left so as to maintain the plate-like element 4 perfectly adherent to the rotary member 3, as shown in FIG. 6.
  • the rotary member 3 is adherent directly to the housing of the motor according to known arrangements, and the deformation of such a housing prevents the pressure fluid in the groove 16 for example from completely reaching the conduits l9 concerned, but allows the same to flow laterally towards the grooves 17 and 17a, i.e., towards the discharge. In this situation the operation is defective and the volumetric efficiency drops, even remarkably, and sometimes the motor is thereby stopped.
  • the axial dimension of the rotary member 3 must be greater than a determined value, so as to guarantee the stiffness of the same member against the pressures. In this manner the surface of the member 3 will be kept flat or plane and adherent to the plate-like element 4, thus avoiding fluid leakage in the sliding zone.
  • the pressure fluid flow such as that through the opening 10, will cause the motor 6 to rotate in one direction due to the fluid being supplied to the pistons through the conduits 19 in communication with the groove 16.
  • counterforcs will be built up in the corresponding areas 18a, while the portion of the motor housing adherent to the plate-like element 4 will be deformed without, however, causing fluid leakage, due to the presence of the seals 20.
  • the fluid is prevented from flowing, as shown in FIG. 6 when the operative pressures reach high values, as occurs in the distributors of known type.
  • the distributors according to the invention thus permits a high volumetric efficiency and this particularly with hydraulic motors at low speed and with high operative pressures.
  • the distributor according to the invention has also a higher mechanical efficiency because the sliding between the rotary member 3 and the plate-like element 4 occurs on flat surfaces thus obtaining a substantially uniform distribution of the frictional forces.
  • the friction torque increases as the deformation of the portion of the motor housing in contact with the distributor increases, because the sliding points tend to move towards the periphery of the rotary member 3, as may be understood by observing FIG. 6, and therefore the arm of the frictional force elongates.
  • a further advantage, of the invention consists in that, while in the known typesan excessive wear or sliding in the portion of the motor housing adjacent to the rotary member makes necessary a longer grinding operation, by making use of the distributor described above the restarting of the operation can be effected after a simple replacement of the plate-like element 4 since the possible damages occur in the latter.
  • the ring 12 is replaced by a disc-like plate 21 which at the face thereof adjacent to the frame 2 has a central depression 22 and an annular co-axial depression 23 and is provided with ring seals 24.
  • a hole 25 opening into a depression 26 formed in the rotary member 3,.
  • a plurality of holes 27 facing an annular groove 28 formed in the member 3 at the passage 9.
  • the plate21 is also secured to the frame 2 by means of two pins 29 which prevent rotation thereof but allow slight axial movements.
  • inner passages 30 designed to put the zone of the depressions 22 and 26 in communication with the peripheral portions of the member 3.
  • the embodiment in FIG. 7 has the advantage of allowing a better distribution of the forces A and B to that of the distribution of the forces acting from the op posite side on the areas 16 and 17.
  • the force A besides acting on the periphery, acts also on the central zone of the rotary member 3, so that it can prevent in a more efficient manner possible swelling deformations due to pressures acting on the area 16.
  • a distributor for hydraulic motors provided with radial pistons, said distributor comprising a casing coaxially secured to the housing of the hydraulic motor and having inlet and outlet par s for the pressure fluid,
  • the distributor further comprises depressed portions each formed around the relative hole of said plate-like element on the face adjacent to said housing and delimited by respective seals, at least a ring element arranged between said casing and said rotatable member and associated to said casing to to freely move axially but prevented from rotating, seal means arranged between said ring element and said casing, said ring element defining concentric areas connected with said inlet and outlet parts respectively, the surface of said areas connected to the inlet part and the surface of the depressed areas surrounding the holes connected with the same inlet part being such that the resultant pressure force urges said rotatable member against said plate

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
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US90219A 1969-11-07 1970-10-26 Distributor for hydraulic motors Expired - Lifetime US3696710A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2409269 1969-11-07

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US (1) US3696710A (de)
AT (1) AT317111B (de)
BE (1) BE758118A (de)
CH (1) CH520269A (de)
DE (1) DE2052305C2 (de)
ES (1) ES385618A1 (de)
FR (1) FR2069086A5 (de)
GB (1) GB1335372A (de)
NL (1) NL7015917A (de)

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3742979A (en) * 1972-03-02 1973-07-03 G Woodling Rotary valve device having a plurality of controlled working passages
US3851669A (en) * 1972-01-25 1974-12-03 Bosch Gmbh Robert Control face arrangement for an axial piston machine
US3875851A (en) * 1971-11-09 1975-04-08 Renold Ltd Hydraulic motors
US3908516A (en) * 1972-05-26 1975-09-30 Twin Disc Inc Timing valve for multipiston hydrostatic engines
US4050544A (en) * 1974-05-01 1977-09-27 Kalyan Jagdish C Lubrication system for an air motor
US4070950A (en) * 1974-12-12 1978-01-31 Cyphelly Ivan J Hydraulic apparatus including rotary valve
US4181067A (en) * 1977-02-17 1980-01-01 Riva Calzoni S.P.A. Distributor for hydraulic motors
US4183285A (en) * 1978-07-10 1980-01-15 Havaco Incorporated Rotary control valve for expansion fluid engines
US4281684A (en) * 1979-09-24 1981-08-04 Dubro, Inc. Balanced rotary-faced valve
US4313364A (en) * 1979-06-04 1982-02-02 Pneumo Corporation Dual cylinder linear servo motor
US4411190A (en) * 1981-05-07 1983-10-25 Kilmer John B Energy translation device having individually compensated sliding valves and counterbalancing mechanism
US4414883A (en) * 1979-02-08 1983-11-15 Dauvergne Jean L R Power-assisted steering device
US4442755A (en) * 1982-01-25 1984-04-17 Litton Resources Systems, Inc. Power stage servo valve for a seismic vibrator
US4693397A (en) * 1983-07-29 1987-09-15 Ludwig Schwerdtel Gmbh Dosing devices for viscous materials particularly highly viscous materials
US5232349A (en) * 1991-09-01 1993-08-03 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Axial multi-piston compressor having rotary valve for allowing residual part of compressed fluid to escape
US5261451A (en) * 1991-05-02 1993-11-16 General Electric Company Pneumatic multiplexer
US5362208A (en) * 1992-03-04 1994-11-08 Nippondenso Co., Ltd. Swash plate type compressor
US5401144A (en) * 1992-05-13 1995-03-28 Kabushiki Kaisha Toyoda Jisoshokki Seisakusho Swash plate type refrigerant compressor
US5417552A (en) * 1992-10-20 1995-05-23 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Swash plate type variable displacement compressor
US5478212A (en) * 1992-03-04 1995-12-26 Nippondenso Co., Ltd. Swash plate type compressor
US5624248A (en) * 1996-02-21 1997-04-29 Eaton Corporation Gerotor motor and improved balancing plate seal therefor
US5904336A (en) * 1996-04-15 1999-05-18 Emhart Inc. Valve assembly
US5979501A (en) * 1996-12-11 1999-11-09 Korea Institute Of Machinery & Materials Fluid distributing apparatus for piston-type hydraulic motors or pumps
EP1337773A1 (de) * 2000-10-12 2003-08-27 Metso Automation USA, Inc. Vierwegeventil
US20050073125A1 (en) * 2000-12-07 2005-04-07 Visteon Global Technologies, Inc. Suspension system for a vehicle
WO2007122644A1 (en) * 2006-04-20 2007-11-01 S.A.I. Societa' Apparecchiature Idrauliche S.P.A. A radial cylinder hydraulic
US20070258832A1 (en) * 2004-03-31 2007-11-08 Caldwell Niall J Fluid-Working Machine with Displacement Control
ITMI20090257A1 (it) * 2009-02-24 2010-08-25 Parker Hannifin Spa Disco rotante con asole di bilanciamento asimmetriche per la distribuzione di un fluido di azionamento a propulsori di motori
CN102345554A (zh) * 2006-04-20 2012-02-08 S.A.I会水利设备股份公司 星形缸体液压
CN102720669A (zh) * 2012-06-29 2012-10-10 泸州天府液压件有限公司 平面配油的随动旋阀
US8534687B2 (en) 2010-07-05 2013-09-17 Fluid Ride Ltd. Suspension strut for a vehicle
CN104061343A (zh) * 2014-06-16 2014-09-24 张卫 循环式分流阀门
US9574582B2 (en) 2012-04-23 2017-02-21 Fluid Ride, Ltd. Hydraulic pump system and method of operation
US20180087542A1 (en) * 2015-04-02 2018-03-29 Science & Technology Development Fund Direct operated hydraulic servo valves
US20200124185A1 (en) * 2018-10-23 2020-04-23 Cameron International Corporation Low-torque disc for a multiple orifice valve
US20220154833A1 (en) * 2019-03-21 2022-05-19 SWR Europe - van Dinther Antriebstechnik GmbH Multi-port rotary slide valve
US11815191B2 (en) 2019-06-28 2023-11-14 Cameron International Corporation Adjustable erosion resistant choke valve

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EP0217986B1 (de) * 1985-09-13 1991-03-06 Stanley D. Stearns Veränderlich spannende Anlage für Schieber mit Scherabdichtung
EP0270181B1 (de) * 1986-12-05 1992-05-13 RIVA CALZONI S.p.A. Rotierende Verteilungsgruppe für hydraulische Motoren mit umlaufender Flächendichtung
CN111502904A (zh) * 2020-05-18 2020-08-07 何作勇 一种径向柱塞液压马达的配油机构

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US2845941A (en) * 1955-02-25 1958-08-05 Ernest E Wagner Plate valve for rotary units
US3207180A (en) * 1962-06-28 1965-09-21 Sferma Soc Fr D Entretien Et D Pressure fluid distributors
US3556151A (en) * 1967-08-17 1971-01-19 Daikin Ind Ltd Sliding plate-type directional control valve

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FR1311140A (fr) * 1961-04-13 1962-12-07 Sciper Perfectionnement aux pompes à débit variable
GB1026343A (en) * 1962-02-19 1966-04-20 Lucas Industries Ltd Hydraulic pumps and motors
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Patent Citations (3)

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US2845941A (en) * 1955-02-25 1958-08-05 Ernest E Wagner Plate valve for rotary units
US3207180A (en) * 1962-06-28 1965-09-21 Sferma Soc Fr D Entretien Et D Pressure fluid distributors
US3556151A (en) * 1967-08-17 1971-01-19 Daikin Ind Ltd Sliding plate-type directional control valve

Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875851A (en) * 1971-11-09 1975-04-08 Renold Ltd Hydraulic motors
US3851669A (en) * 1972-01-25 1974-12-03 Bosch Gmbh Robert Control face arrangement for an axial piston machine
US3742979A (en) * 1972-03-02 1973-07-03 G Woodling Rotary valve device having a plurality of controlled working passages
US3908516A (en) * 1972-05-26 1975-09-30 Twin Disc Inc Timing valve for multipiston hydrostatic engines
US4050544A (en) * 1974-05-01 1977-09-27 Kalyan Jagdish C Lubrication system for an air motor
US4070950A (en) * 1974-12-12 1978-01-31 Cyphelly Ivan J Hydraulic apparatus including rotary valve
US4181067A (en) * 1977-02-17 1980-01-01 Riva Calzoni S.P.A. Distributor for hydraulic motors
US4183285A (en) * 1978-07-10 1980-01-15 Havaco Incorporated Rotary control valve for expansion fluid engines
US4414883A (en) * 1979-02-08 1983-11-15 Dauvergne Jean L R Power-assisted steering device
US4313364A (en) * 1979-06-04 1982-02-02 Pneumo Corporation Dual cylinder linear servo motor
US4281684A (en) * 1979-09-24 1981-08-04 Dubro, Inc. Balanced rotary-faced valve
US4411190A (en) * 1981-05-07 1983-10-25 Kilmer John B Energy translation device having individually compensated sliding valves and counterbalancing mechanism
US4442755A (en) * 1982-01-25 1984-04-17 Litton Resources Systems, Inc. Power stage servo valve for a seismic vibrator
US4693397A (en) * 1983-07-29 1987-09-15 Ludwig Schwerdtel Gmbh Dosing devices for viscous materials particularly highly viscous materials
US5261451A (en) * 1991-05-02 1993-11-16 General Electric Company Pneumatic multiplexer
US5232349A (en) * 1991-09-01 1993-08-03 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Axial multi-piston compressor having rotary valve for allowing residual part of compressed fluid to escape
US5478212A (en) * 1992-03-04 1995-12-26 Nippondenso Co., Ltd. Swash plate type compressor
US5362208A (en) * 1992-03-04 1994-11-08 Nippondenso Co., Ltd. Swash plate type compressor
US5401144A (en) * 1992-05-13 1995-03-28 Kabushiki Kaisha Toyoda Jisoshokki Seisakusho Swash plate type refrigerant compressor
US5417552A (en) * 1992-10-20 1995-05-23 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Swash plate type variable displacement compressor
US5624248A (en) * 1996-02-21 1997-04-29 Eaton Corporation Gerotor motor and improved balancing plate seal therefor
US5904336A (en) * 1996-04-15 1999-05-18 Emhart Inc. Valve assembly
US5941503A (en) * 1996-04-15 1999-08-24 Emhart Inc. Valve assembly
US5971359A (en) * 1996-04-15 1999-10-26 Emhart Inc. Valve assembly
US6016830A (en) * 1996-04-15 2000-01-25 Emhart, Inc. Valve assembly
US5979501A (en) * 1996-12-11 1999-11-09 Korea Institute Of Machinery & Materials Fluid distributing apparatus for piston-type hydraulic motors or pumps
EP1337773A1 (de) * 2000-10-12 2003-08-27 Metso Automation USA, Inc. Vierwegeventil
AU2001282863B2 (en) * 2000-10-12 2006-04-13 Metso Automation Usa, Inc Four way valve
EP1337773A4 (de) * 2000-10-12 2005-03-09 Metso Automation Usa Inc Vierwegeventil
US20050073125A1 (en) * 2000-12-07 2005-04-07 Visteon Global Technologies, Inc. Suspension system for a vehicle
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Also Published As

Publication number Publication date
DE2052305C2 (de) 1984-05-03
GB1335372A (en) 1973-10-24
DE2052305A1 (de) 1971-05-13
BE758118A (fr) 1971-04-01
ES385618A1 (es) 1973-03-16
AT317111B (de) 1974-08-12
FR2069086A5 (de) 1971-09-03
CH520269A (de) 1972-03-15
NL7015917A (de) 1971-05-11

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