SE8503569D0 - Anordning vid en hydraulisk krets innefattande en tryckvetskekella och minst en hydraulisk motor - Google Patents

Anordning vid en hydraulisk krets innefattande en tryckvetskekella och minst en hydraulisk motor

Info

Publication number
SE8503569D0
SE8503569D0 SE8503569A SE8503569A SE8503569D0 SE 8503569 D0 SE8503569 D0 SE 8503569D0 SE 8503569 A SE8503569 A SE 8503569A SE 8503569 A SE8503569 A SE 8503569A SE 8503569 D0 SE8503569 D0 SE 8503569D0
Authority
SE
Sweden
Prior art keywords
actuator
meter
valve
hydraulic
fluid
Prior art date
Application number
SE8503569A
Other languages
English (en)
Other versions
SE8503569L (sv
SE455637B (sv
Inventor
R H Breeden
H D Taylor
R G Farrell
K R Lonnemo
Original Assignee
Sperry Corp
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
Priority claimed from US06/024,058 external-priority patent/US4201052A/en
Application filed by Sperry Corp filed Critical Sperry Corp
Publication of SE8503569D0 publication Critical patent/SE8503569D0/sv
Publication of SE8503569L publication Critical patent/SE8503569L/sv
Publication of SE455637B publication Critical patent/SE455637B/sv

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38Control of exclusively fluid gearing
    • F16H61/40Control of exclusively fluid gearing hydrostatic
    • F16H61/42Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
    • F16H61/433Pump capacity control by fluid pressure control means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20546Type of pump variable capacity
    • F15B2211/20553Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/305Directional control characterised by the type of valves
    • F15B2211/30525Directional control valves, e.g. 4/3-directional control valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/31Directional control characterised by the positions of the valve element
    • F15B2211/3144Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/32Directional control characterised by the type of actuation
    • F15B2211/329Directional control characterised by the type of actuation actuated by fluid pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/35Directional control combined with flow control
    • F15B2211/351Flow control by regulating means in feed line, i.e. meter-in control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/405Flow control characterised by the type of flow control means or valve
    • F15B2211/40515Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/415Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/42Flow control characterised by the type of actuation
    • F15B2211/428Flow control characterised by the type of actuation actuated by fluid pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/46Control of flow in the return line, i.e. meter-out control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/50Pressure control
    • F15B2211/505Pressure control characterised by the type of pressure control means
    • F15B2211/50509Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/50Pressure control
    • F15B2211/515Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5156Pressure control characterised by the connections of the pressure control means in the circuit being connected to a return line and a directional control valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/50Pressure control
    • F15B2211/555Pressure control for assuring a minimum pressure, e.g. by using a back pressure valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/605Load sensing circuits
    • F15B2211/6051Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/61Secondary circuits
    • F15B2211/613Feeding circuits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/635Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051Linear output members
    • F15B2211/7053Double-acting output members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75Control of speed of the output member

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Valve Device For Special Equipments (AREA)
SE8503569A 1979-03-26 1985-07-23 Anordning vid en hydraulisk krets SE455637B (sv)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/024,058 US4201052A (en) 1979-03-26 1979-03-26 Power transmission
US11793680A 1980-02-04 1980-02-04

Publications (3)

Publication Number Publication Date
SE8503569D0 true SE8503569D0 (sv) 1985-07-23
SE8503569L SE8503569L (sv) 1985-07-23
SE455637B SE455637B (sv) 1988-07-25

Family

ID=26697984

Family Applications (2)

Application Number Title Priority Date Filing Date
SE8002302A SE443409B (sv) 1979-03-26 1980-03-25 Ventilanordning for styrning av funktionen hos en hydraulmotor
SE8503569A SE455637B (sv) 1979-03-26 1985-07-23 Anordning vid en hydraulisk krets

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SE8002302A SE443409B (sv) 1979-03-26 1980-03-25 Ventilanordning for styrning av funktionen hos en hydraulmotor

Country Status (10)

Country Link
JP (1) JPS6479405A (sv)
AU (1) AU536970B2 (sv)
CA (1) CA1142057A (sv)
DE (1) DE3011088A1 (sv)
FR (1) FR2452618A1 (sv)
GB (1) GB2044366B (sv)
IN (1) IN154913B (sv)
IT (2) IT1221037B (sv)
NO (1) NO155211C (sv)
SE (2) SE443409B (sv)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345435A (en) * 1980-05-05 1982-08-24 Sperry Corporation Power transmission
US4353289A (en) * 1980-05-29 1982-10-12 Sperry Corporation Power transmission
FI72579C (sv) * 1981-11-12 1987-06-08 Vickers Inc Transmission.
DE3347000A1 (de) * 1983-12-24 1985-07-04 Robert Bosch Gmbh, 7000 Stuttgart Elektrohydraulische einrichtung zur steuerung eines doppeltwirkenden hydromotors
CA1234529A (en) * 1984-04-30 1988-03-29 Vinod K. Nanda Power transmission
LU85774A1 (fr) * 1985-02-13 1985-07-24 Hydrolux Sarl Hydraulischer steuerblock
DE3629479A1 (de) * 1985-09-03 1987-07-16 Barmag Barmer Maschf Wegeventil
DE3841507C1 (sv) * 1988-01-22 1989-06-29 Danfoss A/S, Nordborg, Dk
US5088384A (en) * 1989-08-30 1992-02-18 Vickers, Incorporated Hydraulic actuator controlled by meter-in valves and variable pressure relief valves
DE4342487B4 (de) * 1993-12-13 2005-03-31 Linde Ag Hydrostatisches Antriebssystem mit Nachsaugeventil
DE10216958B8 (de) * 2002-04-17 2004-07-08 Sauer-Danfoss (Nordborg) A/S Hydraulische Steuerung
US20060168955A1 (en) * 2005-02-03 2006-08-03 Schlumberger Technology Corporation Apparatus for hydraulically energizing down hole mechanical systems
CN105705706B (zh) * 2013-10-31 2017-10-10 沃尔沃建造设备有限公司 用于具有浮动功能的工程设备的流量控制阀

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE26028E (en) * 1963-05-16 1966-05-17 Pilot operated control valve mechanism
US3411536A (en) * 1966-07-06 1968-11-19 Koehring Co Pilot operated control valve mechanism
GB1302742A (sv) * 1969-04-07 1973-01-10
DE1936370A1 (de) * 1969-07-17 1971-02-04 Volkswagenwerk Ag Ventileinheit zur Steuerung von doppeltwirkenden Arbeitszylindern
DE2232857C2 (de) * 1972-07-05 1983-11-24 Robert Bosch Gmbh, 7000 Stuttgart Steuereinrichtung für ein hydraulisch angetriebenes Arbeitsgerät
CH563532A5 (sv) * 1973-03-14 1975-06-30 Buehler Ag Geb
SE387415B (sv) * 1974-03-22 1976-09-06 Tedeco Ag Fluidventilanordning
DE2500096C3 (de) * 1975-01-03 1984-08-02 Sauer Getriebe KG, 2350 Neumünster Hydraulische Schaltungseinrichtung zur Druckmittelwegesteuerung mit Konstantregelung des Druckmittelstroms für einen doppeltwirkenden Hydromotor
US3991571A (en) * 1976-03-15 1976-11-16 Caterpillar Tractor Co. Fluid system of a work vehicle having fluid combining means and signal combining means
JPS5482574A (en) * 1977-12-13 1979-06-30 Kobe Steel Ltd Control circuit of actuator

Also Published As

Publication number Publication date
NO155211B (no) 1986-11-17
AU5682480A (en) 1980-10-02
IN154913B (sv) 1984-12-22
NO800846L (no) 1980-09-29
IT1221037B (it) 1990-06-21
IT8948200A0 (it) 1989-07-18
FR2452618B1 (sv) 1984-02-24
JPS6479405A (en) 1989-03-24
SE443409B (sv) 1986-02-24
IT1232358B (it) 1992-01-28
AU536970B2 (en) 1984-05-31
SE8002302L (sv) 1980-09-27
SE8503569L (sv) 1985-07-23
GB2044366A (en) 1980-10-15
DE3011088A1 (de) 1980-10-09
GB2044366B (en) 1983-08-03
FR2452618A1 (fr) 1980-10-24
CA1142057A (en) 1983-03-01
IT8048246A0 (it) 1980-03-24
NO155211C (no) 1987-02-25
SE455637B (sv) 1988-07-25

Similar Documents

Publication Publication Date Title
US4210061A (en) Three-circuit fluid system having controlled fluid combining
EP0004540B1 (en) High pressure hydraulic system
EP0085962B1 (en) Hydraulic control system especially for swinging loads
KR940701487A (ko) 토목·건설 기계의 유압회로장치
SE8503569L (sv) Anordning vid en hydraulisk krets innefattande en tryckvetskekella och minst en hydraulisk motor
CA1169334A (en) Power transmission
EP0160289A3 (en) Hydraulic control system
EP0381328A3 (en) Oil hydraulic circuit for hydraulic machine such as a shovel
US3398650A (en) Apparatus for regulating fluid flow with respect to a hydraulic load
KR910003223A (ko) 주행식 건설기계의 유압펌프 제어회로
US4215720A (en) Fluid control valve system
GB1380371A (en) Machine having a telescopic boom
JPH0674204A (ja) 複数の消費器のための油圧式の制御装置
GB1387367A (en) Control device for an hydraulically actuated implement
ATE298395T1 (de) Wegeventil
US5170692A (en) Hydraulic control system
ATE52560T1 (de) Stroemungsrueckgewinnungssystem fuer hydraulikkreislaeufe mit pumpen und druckkompensierten verteilungsventilen fuer arbeitsglieder von erdbewegungsmaschinen.
US4611527A (en) Power transmission
KR960014683A (ko) 중장비의 직진주행장치
DE59306308D1 (de) Hydraulische Schiebersteuerung für Arbeitszylinder mit ungleichen Kolbengeschwindigkeiten
US3955474A (en) Fluid pressure system having pumps and valves
US3862645A (en) Pilot control valve
GB1267461A (en) Hydraulic control apparatus for driving a drivable member
ES8402641A1 (es) "perfeccionamientos en los sistemas de regulacion hidraulicos".
US4191202A (en) Polarity control valve

Legal Events

Date Code Title Description
NUG Patent has lapsed

Ref document number: 8503569-9

Effective date: 19931008

Format of ref document f/p: F