JPS57154505A - Hydraulic system - Google Patents

Hydraulic system

Info

Publication number
JPS57154505A
JPS57154505A JP56036915A JP3691581A JPS57154505A JP S57154505 A JPS57154505 A JP S57154505A JP 56036915 A JP56036915 A JP 56036915A JP 3691581 A JP3691581 A JP 3691581A JP S57154505 A JPS57154505 A JP S57154505A
Authority
JP
Japan
Prior art keywords
valve
hydraulic cylinder
pilot
power failure
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.)
Pending
Application number
JP56036915A
Other languages
Japanese (ja)
Inventor
Norio Matsumoto
Takao Ebara
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP56036915A priority Critical patent/JPS57154505A/en
Publication of JPS57154505A publication Critical patent/JPS57154505A/en
Pending 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/002—Electrical failure
    • 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
    • F15B11/003—Systems with load-holding valves

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To prevent a trouble from being caused by the wrong action of a servo valve in power failure, by providing a check valve between the servo valve and a hydraulic cylinder and reducing the pilot pressure to automatically shut off a pilot valve in the power failure. CONSTITUTION:Pilot check valves 22, 23 are provided between a servo valve 12 and a hydraulic cylinder 11. In power failure, a solenoid valve 21 is deenergized to connect pilot pipes 25, 26 to each other so that the pressurized oil in the check valve 23 flows out into a pipe 13 and the pilot pressure is reduced. For that reason, the check valves 22, 23 function to prevent the counter flow to stop the flow of pressurized oil between the hydraulic cylinder 11 and the servo valve 12 so that the hydraulic cylinder keeps its position. When a valve 31 is manually closed and valves 27, 30 are manually opened, the counter flow preventive function of the check valves 22, 23 is lost due to the pilot pressure so that the hydraulic cylinder 11 can be operated by adjusting the degree of opening of the valve 30.
JP56036915A 1981-03-13 1981-03-13 Hydraulic system Pending JPS57154505A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56036915A JPS57154505A (en) 1981-03-13 1981-03-13 Hydraulic system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56036915A JPS57154505A (en) 1981-03-13 1981-03-13 Hydraulic system

Publications (1)

Publication Number Publication Date
JPS57154505A true JPS57154505A (en) 1982-09-24

Family

ID=12483060

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56036915A Pending JPS57154505A (en) 1981-03-13 1981-03-13 Hydraulic system

Country Status (1)

Country Link
JP (1) JPS57154505A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61180001A (en) * 1985-02-04 1986-08-12 Hitachi Constr Mach Co Ltd Hydraulic circuit control ling equipment
JPS6252203A (en) * 1985-09-02 1987-03-06 Hitachi Constr Mach Co Ltd Control device of hydraulic circuit
JPS6252202A (en) * 1985-09-02 1987-03-06 Hitachi Constr Mach Co Ltd Control device of hydraulic circuit
EP0190703B1 (en) * 1985-02-04 1988-05-25 Hitachi Construction Machinery Co., Ltd. Control system for hydraulic circuit
JPH01126405A (en) * 1987-11-10 1989-05-18 Tsudakoma Corp Pneumatic circuit
JP2009138938A (en) * 2007-12-10 2009-06-25 Volvo Construction Equipment Ab Hydraulic circuit having external pilot pressure operated holding valve
EP2261512A3 (en) * 2009-06-09 2014-06-04 Lukas Hydraulik GmbH Hydraulic control device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61180001A (en) * 1985-02-04 1986-08-12 Hitachi Constr Mach Co Ltd Hydraulic circuit control ling equipment
EP0190703B1 (en) * 1985-02-04 1988-05-25 Hitachi Construction Machinery Co., Ltd. Control system for hydraulic circuit
JPH0514121B2 (en) * 1985-02-04 1993-02-24 Hitachi Construction Machinery
JPS6252203A (en) * 1985-09-02 1987-03-06 Hitachi Constr Mach Co Ltd Control device of hydraulic circuit
JPS6252202A (en) * 1985-09-02 1987-03-06 Hitachi Constr Mach Co Ltd Control device of hydraulic circuit
JPH0514803B2 (en) * 1985-09-02 1993-02-26 Hitachi Construction Machinery
JPH0514804B2 (en) * 1985-09-02 1993-02-26 Hitachi Construction Machinery
JPH01126405A (en) * 1987-11-10 1989-05-18 Tsudakoma Corp Pneumatic circuit
JP2009138938A (en) * 2007-12-10 2009-06-25 Volvo Construction Equipment Ab Hydraulic circuit having external pilot pressure operated holding valve
EP2261512A3 (en) * 2009-06-09 2014-06-04 Lukas Hydraulik GmbH Hydraulic control device

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