EP0116739A2 - Valve hydraulique - Google Patents

Valve hydraulique Download PDF

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Publication number
EP0116739A2
EP0116739A2 EP83303677A EP83303677A EP0116739A2 EP 0116739 A2 EP0116739 A2 EP 0116739A2 EP 83303677 A EP83303677 A EP 83303677A EP 83303677 A EP83303677 A EP 83303677A EP 0116739 A2 EP0116739 A2 EP 0116739A2
Authority
EP
European Patent Office
Prior art keywords
valve
return
hydraulic
flow
return valve
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Withdrawn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
EP83303677A
Other languages
German (de)
English (en)
Other versions
EP0116739A3 (fr
Inventor
Ronald Bernard Walters
Clifford James Balmer
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.)
Vickers Inc
Original Assignee
Sperry Corp
Vickers Inc
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 Sperry Corp, Vickers Inc filed Critical Sperry Corp
Publication of EP0116739A2 publication Critical patent/EP0116739A2/fr
Publication of EP0116739A3 publication Critical patent/EP0116739A3/fr
Withdrawn legal-status Critical Current

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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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves

Definitions

  • This invention relates to hydraulic valves and in particular to pilot-operated, flow feedback controlled hydraulic valves.
  • a pilot-operated, flow feedback controlled hydraulic spool valve is known, for example from British Patent Specification No.1,462,879.
  • the main valve disclosed in Specification No.1,462,879 is a spool valve which controls the amount and direction of fluid flow to a hydraulic actuator.
  • the main valve is operated by means of a pilot valve which regulates the hydraulic pressures in valve chambers at the extreme ends of the main valve spool.
  • the pilot value is controlled by.-an electric force motor whose input signal is derived by summing an electrical demand signal with an electrical feedback signal which is provided by a flow sensor sensing the rate of fluid flow through the valve.
  • the present invention provides an improvement for pilot-operated, flow feedback controlled hydraulic valves which is of advantage especially, though not exclusively, where more than one valve is operated off a common source of fluid pressure, and particularly so where space and weight limitations are of importance.
  • a hydraulic valve comprising a main valve operable to control flow of fluid to a load, a pilot valve operable to control the main valve, and non-return valve means arranged to operate as variable-orifice, flow-sensing means.
  • each valve is supplied from a common pressure supply via a non-return valve.
  • the non-return valve prevents return flow from any given valve back to the supply line, should the pressure in the supply line drop below the current fluid pressure in, and downstream of, that valve.
  • valves controlling different loads or different degrees of freedom of a load When two or more valves controlling different loads or different degrees of freedom of a load are to be operated by the same operator, the various valves are frequently formed into a bank of valves with some common fluid passages such as the supply line and the return lines or lines to tank being provided by fluid passages traversing the bank of, except for minor variations, identical valves, and the present invention enables each of the valves to be provided in a simple manner with its own check valve and flow sensor.
  • the drawing shows a sectional view of a hydraulic control valve 1 of the kind normally found in assemblies or banks of two or more valves.
  • the valve as others (not shown) in the bank, comprises a main stage 2, a main stage actuating attachment 3, a pilot valve 4, and a pair of opposed solenoids 5 controlling the operation of the pilot valve 4.
  • the main stage 2 is a spool valve with a valve spool 21 of conventional design.
  • the valve spool 21 is attached at one end to a back-up manual control lever 6, and at its other end, via a coupling arrangement 31 and a coupling rod 32, to a valve actuating piston 30 which is rigidly coupled to the main valve spool 21.
  • the main spool 21 can thus be shifted along the axis of its valve bore by applying the appropriate control pressures to the chambers 33 and 34. If the valve spool 21 is to be moved to the right(as seen in the drawing), the pressure in the valve chamber 34 must exceed that in the valve chamber 33, and vice-versa if the spool 21 is to be moved to the left.
  • the pilot valve 4 is a conventional spool valve supplied with fluid under pressure through a central port 42 suitably connected, optionally via a pressure reducing valve (not shown), to a pressure supply line 22.
  • An electrical input signal to the solenoids 5 determines the position of the pilot spool 41 within its valve bore.
  • Fluid is supplied to the valve under pressure through the fluid supply line 22 and hence, depending on the position of the central lands 28a and 28b in relation to the ports 25a and 25b, to the service ports 29a and 29b which are connected to the load (not shown).
  • a non-return or check valve 7 is provided which is spring biased against a shoulder 23 at one end of a branch passage 24 leading from the supply line 22 to the valve inlet port 25.
  • a linear displacement detector 8 such as, for example, a commercially available linear variable displacement transducer (LVDT)
  • LVDT linear variable displacement transducer

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Servomotors (AREA)
EP83303677A 1982-07-02 1983-06-24 Valve hydraulique Withdrawn EP0116739A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8219279 1982-07-02
GB8219279 1982-07-12

Publications (2)

Publication Number Publication Date
EP0116739A2 true EP0116739A2 (fr) 1984-08-29
EP0116739A3 EP0116739A3 (fr) 1985-05-02

Family

ID=10531456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83303677A Withdrawn EP0116739A3 (fr) 1982-07-02 1983-06-24 Valve hydraulique

Country Status (3)

Country Link
EP (1) EP0116739A3 (fr)
JP (1) JPS5923106A (fr)
AU (1) AU1582983A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056561A (en) * 1990-02-08 1991-10-15 Byers James O Remote controlled, individually pressure compensated valve
US5234017A (en) * 1990-11-30 1993-08-10 Aeroquip Corporation Restrictor valve for a metered liquid dispensing system
EP0637693A1 (fr) * 1993-07-07 1995-02-08 Voac Hydraulics Boras Ab Unité de commande pour un moteur hydraulique
US6016838A (en) * 1997-03-07 2000-01-25 Mead Fluid Dynamics, Inc. Valve construction
CN117927522A (zh) * 2024-03-22 2024-04-26 山西斯普瑞机械制造股份有限公司 一种泡塑成型机合模缸差动组合阀

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1174768A (en) * 1966-03-03 1969-12-17 Dowty Electrics Ltd Fluid Pressure Control Valve
DE2754878A1 (de) * 1977-12-09 1979-06-13 Rexroth Gmbh G L Lastunabhaengig arbeitendes elektrisch ansteuerbares wegeventil
US4315436A (en) * 1980-02-01 1982-02-16 Transamerica Delaval Inc. Flow-rate transducer with electrical output

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056561A (en) * 1990-02-08 1991-10-15 Byers James O Remote controlled, individually pressure compensated valve
US5234017A (en) * 1990-11-30 1993-08-10 Aeroquip Corporation Restrictor valve for a metered liquid dispensing system
EP0637693A1 (fr) * 1993-07-07 1995-02-08 Voac Hydraulics Boras Ab Unité de commande pour un moteur hydraulique
US6016838A (en) * 1997-03-07 2000-01-25 Mead Fluid Dynamics, Inc. Valve construction
CN117927522A (zh) * 2024-03-22 2024-04-26 山西斯普瑞机械制造股份有限公司 一种泡塑成型机合模缸差动组合阀

Also Published As

Publication number Publication date
EP0116739A3 (fr) 1985-05-02
AU1582983A (en) 1984-01-05
JPS5923106A (ja) 1984-02-06

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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

AK Designated contracting states

Designated state(s): DE FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): DE FR GB IT SE

17P Request for examination filed

Effective date: 19851016

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VICKERS, INCORPORATED

17Q First examination report despatched

Effective date: 19860822

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19870101

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WALTERS, RONALD BERNARD

Inventor name: BALMER, CLIFFORD JAMES