EP0047885B1 - Stromregelventilanordnung - Google Patents

Stromregelventilanordnung Download PDF

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Publication number
EP0047885B1
EP0047885B1 EP81106571A EP81106571A EP0047885B1 EP 0047885 B1 EP0047885 B1 EP 0047885B1 EP 81106571 A EP81106571 A EP 81106571A EP 81106571 A EP81106571 A EP 81106571A EP 0047885 B1 EP0047885 B1 EP 0047885B1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
line
inlet
pilot
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
EP81106571A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0047885A1 (de
Inventor
Walter Wohlrab
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.)
Mannesmann Demag Krauss Maffei GmbH
Original Assignee
Krauss Maffei AG
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 Krauss Maffei AG filed Critical Krauss Maffei AG
Priority to AT81106571T priority Critical patent/ATE6168T1/de
Publication of EP0047885A1 publication Critical patent/EP0047885A1/de
Application granted granted Critical
Publication of EP0047885B1 publication Critical patent/EP0047885B1/de
Expired legal-status Critical Current

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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
    • F04B49/08—Regulating by delivery pressure
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2579—Flow rate responsive
    • Y10T137/2589—Pilot valve operated
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2579—Flow rate responsive
    • Y10T137/2594—Choke

Definitions

  • the invention relates to a three-way flow control valve arrangement according to the preamble of the main claim.
  • the flow rate in the throttle valve is determined by the pressure drop between its inlet and outlet, which in turn corresponds to the pressure force of the spring, which acts on the control surface of the pressure compensator acts, which is also acted upon by the pressure from the control line connected to the output of the throttle valve.
  • this valve arrangement has the disadvantage that with different delivery capacities for the inlet flow, such as result, for example, from the connection of a further delivery pump, the pressure drop, in particular in the line leading to the overflow valve, changes greatly, and thus the flow through the throttle valve and its supply and discharge line acting pressure drop is raised. The result is a larger flow rate caused by the higher pressure drop.
  • the invention is therefore based on the object to provide a three-way flow control valve arrangement with simple means, which ensures the constancy of the flow rate regardless of external operating and interference.
  • the known three-way flow control valve arrangement according to FIG. 1 has a throttle valve 1 designed as a 2/2-way valve, which is connected to an inlet line 2 carrying an inlet flow and to an outlet line 3 carrying a constant current.
  • the inflow flow is conveyed from a tank 4 by a first pump 5 into the inflow line 2, the delivery rate of a second pump 6 also being able to be switched on as required.
  • a branch 7 of the inlet line 2 is connected to an overflow valve 8 with a pressure compensator 9 which, in the position shown, blocks the flow of an excess flow into an overflow line 10 leading to the tank 4.
  • the pressure compensator 9 has two control surfaces 11 and 12 of the same size, of which one control surface 11 is acted upon by the inlet flow and the other control surface 12 by the pressure medium of a control line 13, which is led from the outlet line 3 to the overflow valve 8, and by the pressure of a spring 14, whose pressure force determines the pressure drop in the throttle valve 1.
  • an input pressure measuring line 16 is connected directly to the inlet 15 of the throttle valve 1 and an output pressure measuring line 18 is connected directly to the outlet 17.
  • the input pressure measurement line 16 branches into a branch line 19, an input line 20 and into the control line 13 leading to the control surface 12 of the pressure compensator 9.
  • the input pressure measurement lines 16 have their branches and the output pressure measuring line 18 are only measuring lines with a small cross-section.
  • the pressure compensator 9 is designed as a 2/2 slide valve or 2/2 seat valve with an area ratio of 1: 1.
  • the input line 20 is connected to a pilot valve 21, also designed as a 2/2-way valve, which has a double-acting control piston with two pilot valves 22 and 23 of the same size, one pilot valve 22 to the branch pipe 19 and the other pilot valve 23 to the output Pressure measuring line 18 are connected.
  • the pilot control surface 23 is also acted upon by a pilot control spring 24, the compressive force of which determines the pressure drop that occurs in the throttle valve 1.
  • An outlet line 25 leads from the pilot valve 21 to a container with a low pressure level, for example into the outlet pressure measuring line 18. However, the outlet line 25 can also open into the tank 4.
  • orifices 26 are arranged in the branch line 19, in the input line 20 leading to the pilot valve 21 and in the control line 13.
  • the pressure compensator 9 is controlled via the control line 13 branching off from the input pressure measurement line 16 so that the pressure difference at the connections of the input and output pressure measurement lines 16 and 18 at the throttle valve 1 is the value specified by the pilot spring 24 of the pilot valve 21 corresponds. Due to the fact that the connections are located directly at the inlet 15 and outlet 17 of the throttle valve 1, interference can occur in the inlet line 2 and its branch 7 to the overflow valve 8 and in the outlet line 3, as they result from the throttling action of these lines especially when switching on additional delivery quantities (pumps 5 and 6), no longer adversely affect the constancy of the flow rate through the throttle valve 1. The pressure difference between inlet 15 and outlet 17 is thus maintained within narrow limits, as a result of which a constant flow rate can be guaranteed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)
  • Flow Control (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Servomotors (AREA)
EP81106571A 1980-09-12 1981-08-25 Stromregelventilanordnung Expired EP0047885B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81106571T ATE6168T1 (de) 1980-09-12 1981-08-25 Stromregelventilanordnung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3034377 1980-09-12
DE19803034377 DE3034377A1 (de) 1980-09-12 1980-09-12 Stromregelventil

Publications (2)

Publication Number Publication Date
EP0047885A1 EP0047885A1 (de) 1982-03-24
EP0047885B1 true EP0047885B1 (de) 1984-02-08

Family

ID=6111740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106571A Expired EP0047885B1 (de) 1980-09-12 1981-08-25 Stromregelventilanordnung

Country Status (5)

Country Link
US (1) US4365645A (enrdf_load_stackoverflow)
EP (1) EP0047885B1 (enrdf_load_stackoverflow)
JP (1) JPS5779369A (enrdf_load_stackoverflow)
AT (1) ATE6168T1 (enrdf_load_stackoverflow)
DE (1) DE3034377A1 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3434014A1 (de) * 1984-09-15 1986-03-20 Beringer-Hydraulik GmbH, Neuheim, Zug Hydraulische steuerung
DE3608469A1 (de) * 1986-03-14 1987-10-01 Bosch Gmbh Robert Hydraulikanlage
GB8925592D0 (en) * 1989-11-13 1990-01-04 Hobourn Eng Ltd Positive displacement pump systems
US20060005435A1 (en) * 2004-07-07 2006-01-12 Gamble Robert N Ii Snow plow having reversible wings
US7675678B2 (en) * 2005-11-08 2010-03-09 Perioptix Locking inter-pupillary distance and convergence adjustment mechanism
US8046122B1 (en) 2008-08-04 2011-10-25 Brunswick Corporation Control system for a marine vessel hydraulic steering cylinder
KR20140050004A (ko) * 2011-07-12 2014-04-28 볼보 컨스트럭션 이큅먼트 에이비 건설기계용 유압 액츄에이터 댐핑 제어시스템
CN102966634A (zh) * 2012-11-16 2013-03-13 无锡汇虹机械制造有限公司 一种可适应于负载压力的液压泵站节能方法
CN105971862B (zh) * 2016-05-24 2017-09-12 北汽福田汽车股份有限公司 一种泵送系统换向控制方法及其装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3128783A (en) * 1957-02-11 1964-04-14 Holley Carburetor Co Bypass valve with limited reset
US3005463A (en) * 1957-07-24 1961-10-24 Vickers Inc Power transmission
DE1528782A1 (de) * 1964-08-29 1969-07-10 Wilhelm Odendahl Mindestmengensteuerung fuer Kesselspeise-Kreiselpumpen
DE1922145A1 (de) * 1969-04-25 1970-10-29 Bellows Valvair Kaemper Gmbh Kombinationsregler
BE757640A (fr) * 1969-10-16 1971-04-16 Borg Warner Systemes hydrauliques, notamment pour la regulation d'une pompea debit variable
CH513340A (de) * 1970-10-28 1971-09-30 Beringer Hydraulik Gmbh Steuervorrichtung für hydraulisch betriebene Einrichtungen
US3965921A (en) * 1972-06-08 1976-06-29 Abex Corporation Controlled opening pressure compensated flow control valve
DE2551088C2 (de) * 1975-11-14 1984-06-28 Mannesmann Rexroth GmbH, 8770 Lohr Vorrichtung zur Mengen- und Druckregelung für Verstellpumpen
US4114637A (en) * 1976-12-20 1978-09-19 Double A Products Company Variable differential pressure unloading valve apparatus
DE2849877A1 (de) * 1978-11-17 1980-05-29 Teves Gmbh Alfred Speicherladeventil

Also Published As

Publication number Publication date
DE3034377A1 (de) 1982-04-22
EP0047885A1 (de) 1982-03-24
US4365645A (en) 1982-12-28
ATE6168T1 (de) 1984-02-15
DE3034377C2 (enrdf_load_stackoverflow) 1989-03-02
JPH0423122B2 (enrdf_load_stackoverflow) 1992-04-21
JPS5779369A (en) 1982-05-18

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