GB1437199A - Hydraulic control circuit - Google Patents

Hydraulic control circuit

Info

Publication number
GB1437199A
GB1437199A GB2761373A GB2761373A GB1437199A GB 1437199 A GB1437199 A GB 1437199A GB 2761373 A GB2761373 A GB 2761373A GB 2761373 A GB2761373 A GB 2761373A GB 1437199 A GB1437199 A GB 1437199A
Authority
GB
United Kingdom
Prior art keywords
valve
ram
hydraulic control
spool
control circuit
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
Application number
GB2761373A
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Publication of GB1437199A publication Critical patent/GB1437199A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Check Valves (AREA)

Abstract

1437199 Hydraulic control circuits CATERPILLAR TRACTOR CO 11 June 1973 [21 June 1972] 27613/73 Heading F1P When the pressure of hydraulic liquid in a closed reservoir 10, Fig. 1 rises above a predetermined level, it is relieved by a check-valve 30 which opens the pass liquid through a spool valve to a ram 11. This increase in pressure occurs when a pump 12 is inoperative and the spool 19 is moved to its L position to lower an implement. In this position fluid from the ram 11 flows to the reservoir through passages 18, 23, 24. When valve 30 opens fluid passes to the other end of the ram through passages 37, 33, 34, 17. A check-valve 21 is provided in the passage from the pump to the spool valve.
GB2761373A 1972-06-21 1973-06-11 Hydraulic control circuit Expired GB1437199A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26496172A 1972-06-21 1972-06-21

Publications (1)

Publication Number Publication Date
GB1437199A true GB1437199A (en) 1976-05-26

Family

ID=23008381

Family Applications (2)

Application Number Title Priority Date Filing Date
GB5067975A Expired GB1437200A (en) 1972-06-21 1973-06-11 Dual check valve
GB2761373A Expired GB1437199A (en) 1972-06-21 1973-06-11 Hydraulic control circuit

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB5067975A Expired GB1437200A (en) 1972-06-21 1973-06-11 Dual check valve

Country Status (4)

Country Link
US (1) US3779133A (en)
JP (1) JPS5616282B2 (en)
CA (1) CA971079A (en)
GB (2) GB1437200A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978879A (en) * 1972-08-14 1976-09-07 Danfoss A/S Control means for hydrostatic steering systems and the like
JPS61262891A (en) * 1985-05-15 1986-11-20 オムロン株式会社 Token
JP2559619B2 (en) * 1988-08-16 1996-12-04 株式会社小松製作所 Control valve device
JP4782711B2 (en) * 2007-02-21 2011-09-28 日立建機株式会社 Direction control valve device and direction control valve device block having a plurality of the direction control valve devices

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1342338A (en) * 1962-09-29 1963-11-08 Sigma Improvements in hydraulic devices intended for reciprocating movement of high inertia elements
US3345998A (en) * 1965-02-19 1967-10-10 Gianni A Dotto Safety check valve
US3415160A (en) * 1966-12-08 1968-12-10 Applied Power Ind Inc Multi-speed fluid translator
US3470792A (en) * 1967-08-02 1969-10-07 Cessna Aircraft Co Maximum pressure control apparatus for hydraulic actuators

Also Published As

Publication number Publication date
CA971079A (en) 1975-07-15
US3779133A (en) 1973-12-18
JPS5616282B2 (en) 1981-04-15
JPS4956085A (en) 1974-05-30
GB1437200A (en) 1976-05-26

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920611