JPS5754781A - Relief valve - Google Patents

Relief valve

Info

Publication number
JPS5754781A
JPS5754781A JP12920680A JP12920680A JPS5754781A JP S5754781 A JPS5754781 A JP S5754781A JP 12920680 A JP12920680 A JP 12920680A JP 12920680 A JP12920680 A JP 12920680A JP S5754781 A JPS5754781 A JP S5754781A
Authority
JP
Japan
Prior art keywords
line
pressure
oil
passage
sheet member
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
JP12920680A
Other languages
Japanese (ja)
Inventor
Hiroshi Tamai
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery 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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP12920680A priority Critical patent/JPS5754781A/en
Publication of JPS5754781A publication Critical patent/JPS5754781A/en
Pending legal-status Critical Current

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  • Safety Valves (AREA)

Abstract

PURPOSE: To remove the peak pressure generated in a return line effectively by setting a relief valve as normally open when the oil temperature in the oil-hydraulic circuit of a construction mchine etc. lies low regardless of the relief setting pressure.
CONSTITUTION: When oil temperature in the line 6 on the suction side of a pump is high, expansion of wax 15 will heave a rod 19 through a semifluid body 16, and when a sheet member 20 contacts a block 10 a passage 22 is blocked by a block 10. Under this state, if the pressure in the line 7 rises a poppet 23 shifts downward against a spring 26 to open a passage 21. When the oil temp. is low, on the other hand, contraction of the wax 15 will shift the rod 19 and sheet member 20 downward with the aid of the pressure on the line 7 side to separate the sheet member 20 from the block 10 and thereby to open the passage 22. That is to say, it will be normally open regardless of the pressure on the line 7 side when the oil temp. is low.
COPYRIGHT: (C)1982,JPO&Japio
JP12920680A 1980-09-19 1980-09-19 Relief valve Pending JPS5754781A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12920680A JPS5754781A (en) 1980-09-19 1980-09-19 Relief valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12920680A JPS5754781A (en) 1980-09-19 1980-09-19 Relief valve

Publications (1)

Publication Number Publication Date
JPS5754781A true JPS5754781A (en) 1982-04-01

Family

ID=15003753

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12920680A Pending JPS5754781A (en) 1980-09-19 1980-09-19 Relief valve

Country Status (1)

Country Link
JP (1) JPS5754781A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8667983B2 (en) 2010-10-28 2014-03-11 Hyundai Motor Company Relief valve for oil pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8667983B2 (en) 2010-10-28 2014-03-11 Hyundai Motor Company Relief valve for oil pump

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