EP0036761A3 - Fluid circuit with load check valve - Google Patents

Fluid circuit with load check valve Download PDF

Info

Publication number
EP0036761A3
EP0036761A3 EP81301185A EP81301185A EP0036761A3 EP 0036761 A3 EP0036761 A3 EP 0036761A3 EP 81301185 A EP81301185 A EP 81301185A EP 81301185 A EP81301185 A EP 81301185A EP 0036761 A3 EP0036761 A3 EP 0036761A3
Authority
EP
European Patent Office
Prior art keywords
check valves
spool
check valve
load
load check
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.)
Withdrawn
Application number
EP81301185A
Other languages
German (de)
French (fr)
Other versions
EP0036761A2 (en
Inventor
Donald L. Bianchetta
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 EP0036761A2 publication Critical patent/EP0036761A2/en
Publication of EP0036761A3 publication Critical patent/EP0036761A3/en
Withdrawn legal-status Critical Current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
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The spool-type load check valve (20) of this invention, used in conjunction with additional check valves (60, 61) over­ comes the problem of leakage in conventional spool type check valves by providing a series of interconnecting pas­ sages and chambers (36) for communicating equalized fluid pressure from a cylinder (11) to either end of the spool (27) thereof to provide for minimal leakage. When a pair of such cyl­ inders (11, 12) are utilized, the load check valves (20, 20′) as­ sociated therewith are interconnected by a balance line (50) and resolver valves (47′) ensure equalization of fluid pressure in the cylinders upon actuation thereof and also a gradual des­ cent of a load carried by the cylinders upon loss of fluid pres­ sure between the check valves.
EP81301185A 1980-03-24 1981-03-19 Fluid circuit with load check valve Withdrawn EP0036761A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1980/000321 WO1981002768A1 (en) 1980-03-24 1980-03-24 Fluid circuit with zero leak load check and by-pass valve
WOPCT/US80/00321 1980-03-24

Publications (2)

Publication Number Publication Date
EP0036761A2 EP0036761A2 (en) 1981-09-30
EP0036761A3 true EP0036761A3 (en) 1982-04-07

Family

ID=22154257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81301185A Withdrawn EP0036761A3 (en) 1980-03-24 1981-03-19 Fluid circuit with load check valve

Country Status (3)

Country Link
EP (1) EP0036761A3 (en)
JP (1) JPS57500347A (en)
WO (1) WO1981002768A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI3480475T3 (en) * 2017-10-13 2023-03-20 Enerpac Tool Group Corp Remote conduit de-coupling device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1196927B (en) * 1962-05-18 1965-07-15 Beteiligungs & Patentverw Gmbh Device for congruent running limitation of the moving parts of hydrostatic drives
US3500721A (en) * 1968-07-23 1970-03-17 Eaton Yale & Towne Hydraulic control for two hydraulic motors
DE2036547A1 (en) * 1970-07-23 1972-01-27 Krupp Gmbh Braking and locking device for a hydrostatic drive
US3943825A (en) * 1972-04-17 1976-03-16 Caterpillar Tractor Co. Hydraulic control system for load supporting hydraulic motors
DE2554579A1 (en) * 1975-12-04 1977-06-08 Kodak Ag Light seal for instant picture camera - has roller mounting to which protective black plastic seal material strip is attached
US4102250A (en) * 1976-08-16 1978-07-25 Caterpillar Tractor Co. Load check and bypass valve

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800670A (en) * 1969-10-21 1974-04-02 Caterpillar Tractor Co High pressure implement hydraulic circuit
JPS5226311B2 (en) * 1973-08-24 1977-07-13
US4187877A (en) * 1975-01-13 1980-02-12 Commercial Shearing Inc. Compensated work port fluid valves
US4204459A (en) * 1978-04-19 1980-05-27 Caterpillar Tractor Co. Combination check and flow control valve for hydraulic systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1196927B (en) * 1962-05-18 1965-07-15 Beteiligungs & Patentverw Gmbh Device for congruent running limitation of the moving parts of hydrostatic drives
US3500721A (en) * 1968-07-23 1970-03-17 Eaton Yale & Towne Hydraulic control for two hydraulic motors
DE2036547A1 (en) * 1970-07-23 1972-01-27 Krupp Gmbh Braking and locking device for a hydrostatic drive
US3943825A (en) * 1972-04-17 1976-03-16 Caterpillar Tractor Co. Hydraulic control system for load supporting hydraulic motors
DE2554579A1 (en) * 1975-12-04 1977-06-08 Kodak Ag Light seal for instant picture camera - has roller mounting to which protective black plastic seal material strip is attached
US4102250A (en) * 1976-08-16 1978-07-25 Caterpillar Tractor Co. Load check and bypass valve

Also Published As

Publication number Publication date
EP0036761A2 (en) 1981-09-30
JPS57500347A (en) 1982-02-25
WO1981002768A1 (en) 1981-10-01

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19810327

AK Designated contracting states

Designated state(s): BE DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): BE DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19820513

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BIANCHETTA, DONALD L.