JPS5740104A - Device for preventing hydraulic cylinder from acting due to oil leak - Google Patents

Device for preventing hydraulic cylinder from acting due to oil leak

Info

Publication number
JPS5740104A
JPS5740104A JP11536380A JP11536380A JPS5740104A JP S5740104 A JPS5740104 A JP S5740104A JP 11536380 A JP11536380 A JP 11536380A JP 11536380 A JP11536380 A JP 11536380A JP S5740104 A JPS5740104 A JP S5740104A
Authority
JP
Japan
Prior art keywords
cylinder
oil leak
pilot
oil
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.)
Granted
Application number
JP11536380A
Other languages
Japanese (ja)
Other versions
JPS6352246B2 (en
Inventor
Hitoshi Jo
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.)
KATOU SEISAKUSHO KK
Kato Seisakusho Co Ltd
Original Assignee
KATOU SEISAKUSHO KK
Kato Seisakusho Co 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 KATOU SEISAKUSHO KK, Kato Seisakusho Co Ltd filed Critical KATOU SEISAKUSHO KK
Priority to JP11536380A priority Critical patent/JPS5740104A/en
Publication of JPS5740104A publication Critical patent/JPS5740104A/en
Publication of JPS6352246B2 publication Critical patent/JPS6352246B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To prevent unexpected action due to oil leak, by providing an oil leak detection pump cylinder which generates pilot oil pressure for opening a pilot control valve only while a hydraulic cylinder is stopped and by closing a holding valve when the oil leak is detected.
CONSTITUTION: An oil leak detection pump cylinder 4, which has a pump chamber 4a, is provided. The pump cylinder 4 generates pilot oil pressure for opening a pilot control valve 13 only while a hydraulic cylinder 1 is stopped, without receiving load which acts to the cylinder 1 during its expansion or contraction. When oil leak is detected, a holding valve 9 is closed. When the stopped cylinder 1 is even slightly contracted by the load because of oil leak from a counterbalance valve 10 or a check valve 10a or because of the like, a pump cylinder 4 is contracted to cause the pilot oil pressure in the pump chamber 4a to open a control valve 13 so that the pilot pessure in an oil passage 11 is returned to a tank 5. As a result, the holding valve 9 is closed to keep the cylinder 1 from being contracted further. According to this constitution, minute oil leak is detected with the lapse of time to surely stop the action of the cylinder 1 in the direction of the load.
COPYRIGHT: (C)1982,JPO&Japio
JP11536380A 1980-08-23 1980-08-23 Device for preventing hydraulic cylinder from acting due to oil leak Granted JPS5740104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11536380A JPS5740104A (en) 1980-08-23 1980-08-23 Device for preventing hydraulic cylinder from acting due to oil leak

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11536380A JPS5740104A (en) 1980-08-23 1980-08-23 Device for preventing hydraulic cylinder from acting due to oil leak

Publications (2)

Publication Number Publication Date
JPS5740104A true JPS5740104A (en) 1982-03-05
JPS6352246B2 JPS6352246B2 (en) 1988-10-18

Family

ID=14660665

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11536380A Granted JPS5740104A (en) 1980-08-23 1980-08-23 Device for preventing hydraulic cylinder from acting due to oil leak

Country Status (1)

Country Link
JP (1) JPS5740104A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50125501A (en) * 1974-03-22 1975-10-02
JPS54156985A (en) * 1978-05-31 1979-12-11 Kobe Steel Ltd Safety device of hydraulic circuit having a plurality of actuators

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50125501A (en) * 1974-03-22 1975-10-02
JPS54156985A (en) * 1978-05-31 1979-12-11 Kobe Steel Ltd Safety device of hydraulic circuit having a plurality of actuators

Also Published As

Publication number Publication date
JPS6352246B2 (en) 1988-10-18

Similar Documents

Publication Publication Date Title
FR2412770A1 (en) AUTOMATICALLY OPERATED CHECK VALVE
US4129141A (en) Scram valve
PL293269A1 (en) Admission valve as well as hydraulic safety and liquid fuel supply system incirporating such valve
AU2003201429A1 (en) Valve element
JPS57127136A (en) Closed type cylinder device
JPS5740104A (en) Device for preventing hydraulic cylinder from acting due to oil leak
JPS5491870A (en) Drain recovery system
ES473584A1 (en) Unloading
JPS5560777A (en) Control valve
JPS55139562A (en) Valve device
JPS54108443A (en) Device for automatically opening and closing airtight door
JPS56113876A (en) Device for opening and closing shutoff valve
JPS57101176A (en) Check valve with sub-valve
JPS56162230A (en) Timer system for fuel injection pump
SU1513282A1 (en) Device for damping water hammers
JPS5530556A (en) Flow control valve
JPS55134787A (en) Vane rotary compressor
JPS5442624A (en) Cooling device for transformer
JPS5751075A (en) Shutting off method for flow water of inlet valve
JPS5740175A (en) Main steam stop valve
JPS5773883A (en) Oil leakage preventing method for rotary pump
JPS579371A (en) Safety valve
JPS5754730A (en) Oil pressure control valve device
ATE177962T1 (en) DEVICE FOR AUTOMATICALLY CLOSING A SHUT-OFF VALVE
JPS5449480A (en) Bistable hydraulic cylinder