CA1044119A - Combined unloading and relief valve for pump unloading circuit - Google Patents

Combined unloading and relief valve for pump unloading circuit

Info

Publication number
CA1044119A
CA1044119A CA261,367A CA261367A CA1044119A CA 1044119 A CA1044119 A CA 1044119A CA 261367 A CA261367 A CA 261367A CA 1044119 A CA1044119 A CA 1044119A
Authority
CA
Canada
Prior art keywords
fluid circuit
fluid
spool
unloading
predetermined level
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
CA261,367A
Other languages
English (en)
French (fr)
Inventor
Joseph E. Dezelan
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
Application granted granted Critical
Publication of CA1044119A publication Critical patent/CA1044119A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7782—With manual or external control for line 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
    • Y10T137/87177—With bypass

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
CA261,367A 1976-02-27 1976-09-16 Combined unloading and relief valve for pump unloading circuit Expired CA1044119A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/661,881 US4017221A (en) 1976-02-27 1976-02-27 Combined unloading and relief valve for pump unloading circuit

Publications (1)

Publication Number Publication Date
CA1044119A true CA1044119A (en) 1978-12-12

Family

ID=24655493

Family Applications (1)

Application Number Title Priority Date Filing Date
CA261,367A Expired CA1044119A (en) 1976-02-27 1976-09-16 Combined unloading and relief valve for pump unloading circuit

Country Status (4)

Country Link
US (1) US4017221A (OSRAM)
JP (1) JPS52105301A (OSRAM)
CA (1) CA1044119A (OSRAM)
FR (1) FR2342414A1 (OSRAM)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4138202A (en) * 1976-12-03 1979-02-06 Eller J Marlin Hydraulic motor system for driving a submersible impeller pump in which reversal of hydraulic flow is prevented
US4235415A (en) * 1978-12-22 1980-11-25 Allis-Chalmers Corporation Auxiliary spring assisted valve linkage
JPS595656U (ja) * 1982-06-30 1984-01-14 株式会社小松製作所 クランプ装置の油圧回路
EP0137275B1 (en) * 1983-08-29 1989-05-03 Shin Caterpillar Mitsubishi Ltd. Flow control valve
DE3716083A1 (de) * 1987-05-14 1988-11-24 Kuehnle Kopp Kausch Ag Innenachsige drehkolbenmaschine
DE3717403C1 (de) * 1987-05-23 1988-12-01 Hemscheidt Maschf Hermann Schaltvorrichtung fuer ein hydraulisches Wegeventil
IT1230338B (it) * 1988-07-20 1991-10-18 Steyr Daimler Puch Ag Dispositivo per il riempimento di un innesto a frizione oleodinamico.
US4986075A (en) * 1988-07-26 1991-01-22 Kubota, Ltd. Hydraulic circuit for backhoe
US4911402A (en) * 1989-02-07 1990-03-27 Harborlite Corp. Material handling valve
US5213486A (en) * 1991-12-04 1993-05-25 Trli, Inc. Hydraulic power system
US8096781B2 (en) * 2008-09-24 2012-01-17 Caterpillar Inc. Hydraulic pump system with reduced cold start parasitic loss
DE102009049995A1 (de) * 2009-10-20 2011-04-21 Robert Bosch Gmbh Kaltstartventil
CN114829808A (zh) * 2019-12-20 2022-07-29 克拉克设备公司 用于液压充注回路的旁通的系统和方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2726680A (en) * 1952-10-14 1955-12-13 Plessey Co Ltd Hydraulic valve assembly
US3183977A (en) * 1962-12-03 1965-05-18 Allis Chalmers Mfg Co Tractor power lift system
US3150685A (en) * 1963-02-21 1964-09-29 Caterpillar Tractor Co Hydraulic control with mechanically vented pump unloading means
US3303647A (en) * 1964-06-06 1967-02-14 Komatsu Mfg Co Ltd Hydraulically operated power system
DE1528485A1 (de) * 1964-08-28 1969-07-24 Massey Ferguson Inc Hydraulisches System mit einem kombinierten Stroemungssteuer- und Druckentlastungsventil
BE709066A (OSRAM) * 1968-01-08 1968-05-16
US3522999A (en) * 1968-11-08 1970-08-04 White Motor Corp Pump unloading valve
US3699678A (en) * 1970-11-05 1972-10-24 Int Harvester Co Manual disconnect and feathering control for a hydrostatic transmission
AU6517474A (en) * 1973-03-05 1975-08-07 Caterpillar Tractor Co Hydraulic pump unloading circuit
US3865514A (en) * 1973-07-25 1975-02-11 Sperry Rand Corp Power transmission

Also Published As

Publication number Publication date
US4017221A (en) 1977-04-12
JPS52105301A (en) 1977-09-03
FR2342414A1 (fr) 1977-09-23
FR2342414B1 (OSRAM) 1982-03-26

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