GB1388526A - Hydraulic systems - Google Patents

Hydraulic systems

Info

Publication number
GB1388526A
GB1388526A GB3132473A GB3132473A GB1388526A GB 1388526 A GB1388526 A GB 1388526A GB 3132473 A GB3132473 A GB 3132473A GB 3132473 A GB3132473 A GB 3132473A GB 1388526 A GB1388526 A GB 1388526A
Authority
GB
United Kingdom
Prior art keywords
neutral
spools
passage
flow
fluid
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
GB3132473A
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.)
Borg Warner Corp
Original Assignee
Borg Warner Corp
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 Borg Warner Corp filed Critical Borg Warner Corp
Publication of GB1388526A publication Critical patent/GB1388526A/en
Expired 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • F15B2211/50572—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using a pressure compensating valve for controlling the pressure difference across a flow control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5156—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a return line and a directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Flow Control (AREA)
  • Multiple-Way Valves (AREA)

Abstract

1388526 Fluid-pressure control valves &c BORG-WARNER CORP 2 July 1973 [13 July 1972] 31324/73 Heading F2V An hydraulic system comprises a source 12 of fluid pressure, a sump 14a, 14b, a control valve 11 having a neutral flow passage 34a between the source and the sump, a flow control device 22 having fluid responsive actuator means 58a, 58b and 59a, 59b to adjust the device in response to a pressure drop through the valve 11 and conduits 31f, 60 connecting the actuator means to the neutral flow passage. In the illustrated embodiment, three spools 18a, 18b and 18c centred by springs in a casing 20 are arranged upstream of the device 22, the spool 18a being a two-way valve serving to interrupt or establish communication between the neutral passage and a work port 51a while the spools 18b and 18c constitute three-way and four-way valves, respectively, to connect a single work port 51b with the neutral passage or an exhaust passage 44a or a pair of work ports 51c, 51d with the neutral and exhaust passages. The device 22 prevents excessive pressure drops which might cause the spools to stick and ensures that the flow to the work port is proportional to the movement of the spool. In a modified arrangement, the flow control device is arranged upstream of a pair of spools.
GB3132473A 1972-07-13 1973-07-02 Hydraulic systems Expired GB1388526A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27130272A 1972-07-13 1972-07-13

Publications (1)

Publication Number Publication Date
GB1388526A true GB1388526A (en) 1975-03-26

Family

ID=23035008

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3132473A Expired GB1388526A (en) 1972-07-13 1973-07-02 Hydraulic systems

Country Status (11)

Country Link
JP (1) JPS4957276A (en)
AU (1) AU470644B2 (en)
BE (1) BE802104A (en)
BR (1) BR7305256D0 (en)
CA (1) CA991956A (en)
DE (1) DE2335702A1 (en)
FR (1) FR2193159B1 (en)
GB (1) GB1388526A (en)
IT (1) IT991256B (en)
NL (1) NL7309652A (en)
SE (1) SE399305B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2404524C2 (en) * 1974-01-31 1982-04-01 Elektro-Mechanik Gmbh, 5963 Wenden Multi-way servo valve
JPS5272074A (en) * 1975-12-06 1977-06-16 Kawasaki Heavy Ind Ltd Multicontrol valve available pressure compensation
US4036245A (en) * 1975-12-29 1977-07-19 Sundstrand Corporation Pressure compensated hydraulic control valve
US4569367A (en) * 1985-01-14 1986-02-11 Commercial Shearing, Inc. Hydraulic valve inlet unloaders

Also Published As

Publication number Publication date
FR2193159A1 (en) 1974-02-15
IT991256B (en) 1975-07-30
BE802104A (en) 1973-11-05
AU5774873A (en) 1975-01-09
JPS4957276A (en) 1974-06-04
BR7305256D0 (en) 1974-08-15
DE2335702A1 (en) 1974-01-24
FR2193159B1 (en) 1976-04-30
NL7309652A (en) 1974-01-15
SE399305B (en) 1978-02-06
AU470644B2 (en) 1976-03-25
CA991956A (en) 1976-06-29

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee