EP0241870A3 - Hydraulic control device - Google Patents

Hydraulic control device Download PDF

Info

Publication number
EP0241870A3
EP0241870A3 EP87105284A EP87105284A EP0241870A3 EP 0241870 A3 EP0241870 A3 EP 0241870A3 EP 87105284 A EP87105284 A EP 87105284A EP 87105284 A EP87105284 A EP 87105284A EP 0241870 A3 EP0241870 A3 EP 0241870A3
Authority
EP
European Patent Office
Prior art keywords
pressure
outlet
pilot valve
passage
inlet
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.)
Granted
Application number
EP87105284A
Other languages
German (de)
Other versions
EP0241870B1 (en
EP0241870A2 (en
Inventor
Martin Dipl.-Ing. Heusser (Eth.Zurich)
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.)
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
Original Assignee
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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 Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG filed Critical Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
Priority to AT87105284T priority Critical patent/ATE71191T1/en
Publication of EP0241870A2 publication Critical patent/EP0241870A2/en
Publication of EP0241870A3 publication Critical patent/EP0241870A3/en
Application granted granted Critical
Publication of EP0241870B1 publication Critical patent/EP0241870B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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)
  • Control Of Fluid Pressure (AREA)
  • Fluid-Driven Valves (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention relates to a hydraulic control apparatus comprising a hydraulically adjustable throttle opening between an inlet passage and an outlet passage, a three-way pilot valve connected to an external actuator and having its inlet connected to a control pressure inlet passage, its control outlet being connected to the throttle valve in such a manner that the throttle valve element thereof is adapted to be biased in opposition to the pressure in the outlet passage and to the force of a spring. Known control apparatus require the employ of a displacement sensor for sensing the position or displacement of the throttle valve element and for correspondingly acting on the actuator to thereby vary the actuating force thereof for maintaining the opening degree of the throttle opening. This construction involves considerable complications. It is also disadvantageous that the pilot valve is subjected to the full operating pressure, requiring it to be of a highly accurate and therefor expensive construction. According to the invention the second outlet of the three-way pilot valve is connected to the outlet passage, and the valve element of the pilot valve is subjected to the pressure at the control outlet in opposition to the actuating force and to the pressure at the second outlet, and the inlet pressure supplied to the pilot valve is higher than the outlet pressure at least by the maximum possible pressure difference over the pilot valve.
EP87105284A 1986-04-15 1987-04-09 Hydraulic control device Expired - Lifetime EP0241870B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105284T ATE71191T1 (en) 1986-04-15 1987-04-09 HYDRAULIC CONTROL DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863612684 DE3612684A1 (en) 1986-04-15 1986-04-15 HYDRAULIC CONTROL DEVICE
DE3612684 1986-04-15

Publications (3)

Publication Number Publication Date
EP0241870A2 EP0241870A2 (en) 1987-10-21
EP0241870A3 true EP0241870A3 (en) 1989-10-25
EP0241870B1 EP0241870B1 (en) 1992-01-02

Family

ID=6298724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105284A Expired - Lifetime EP0241870B1 (en) 1986-04-15 1987-04-09 Hydraulic control device

Country Status (7)

Country Link
US (1) US4744542A (en)
EP (1) EP0241870B1 (en)
JP (1) JP2667827B2 (en)
AT (1) ATE71191T1 (en)
DE (2) DE3612684A1 (en)
ES (1) ES2029234T3 (en)
GR (1) GR3003832T3 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3709012A1 (en) * 1987-03-19 1988-09-29 Kuke Kg Fritz CIRCUIT ARRANGEMENT FOR SIGNALING A CALL FOR A TERMINAL SWITCHED IN A DIGITAL TELEPHONE NETWORK
US5097857A (en) * 1991-08-02 1992-03-24 John Mayhew Electro-hydraulic valve-actuator system
GB9420394D0 (en) * 1994-10-10 1994-11-23 Trinova Ltd An hydraulic circuit controlling an actuator
US5654885A (en) * 1995-03-28 1997-08-05 Virginia Valve Company Corporation Valve position controller
US6354327B1 (en) 2000-07-31 2002-03-12 Virginia Valve Company Automatic position-control valve assembly
DE112005003069A5 (en) * 2004-09-28 2007-09-13 Ixetic Bad Homburg Gmbh Steering system
DE102014008648A1 (en) * 2014-06-13 2015-12-17 Hydac Technology Gmbh connection device
DE102016206092A1 (en) * 2016-04-12 2017-10-12 Robert Bosch Gmbh 3-way valve
CN110725823B (en) * 2019-10-11 2021-07-16 太原理工大学 Plug-in type two-stage proportional speed regulating valve based on pressure flying rate detector

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914196A1 (en) * 1979-04-07 1980-10-23 Rexroth Gmbh G L Control valve for pressurised medium - has main piston controlling through-flow bore and servo piston pushing operating element
DE3047144A1 (en) * 1980-02-25 1981-09-10 Veb Kombinat Orsta-Hydraulik, Ddr 7010 Leipzig Hydraulically-controlled hydraulic system resistance - has valve spring chamber connected to inlet and to pilot valve chamber
DE3124904A1 (en) * 1980-07-04 1982-05-06 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Flow valve with a hydraulically adjustable choke valve

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD137615A1 (en) * 1978-07-06 1979-09-12 Ludwig Denk DEVICE FOR CONTACTLESS MONITORING OF HYDRAULIC OR PNEUMATIC VALVES
US4476893A (en) * 1980-07-04 1984-10-16 Barmag Barmer Maschinenfabrik Ag Hydraulic flow control valve
DE3172140D1 (en) * 1981-09-02 1985-10-10 Vickers Systems Gmbh Electro-hydraulic control of an actuator piston

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914196A1 (en) * 1979-04-07 1980-10-23 Rexroth Gmbh G L Control valve for pressurised medium - has main piston controlling through-flow bore and servo piston pushing operating element
DE3047144A1 (en) * 1980-02-25 1981-09-10 Veb Kombinat Orsta-Hydraulik, Ddr 7010 Leipzig Hydraulically-controlled hydraulic system resistance - has valve spring chamber connected to inlet and to pilot valve chamber
DE3124904A1 (en) * 1980-07-04 1982-05-06 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Flow valve with a hydraulically adjustable choke valve

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
OELHYDRAULIK UND PNEUMATIK *
PATENT ABSTRACTS OF JAPAN *

Also Published As

Publication number Publication date
DE3612684C2 (en) 1988-09-29
US4744542A (en) 1988-05-17
GR3003832T3 (en) 1993-03-16
ATE71191T1 (en) 1992-01-15
DE3775594D1 (en) 1992-02-13
JPS62269211A (en) 1987-11-21
JP2667827B2 (en) 1997-10-27
ES2029234T3 (en) 1992-08-01
EP0241870B1 (en) 1992-01-02
EP0241870A2 (en) 1987-10-21
DE3612684A1 (en) 1987-10-22

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