JPS5757969A - Unload valve - Google Patents

Unload valve

Info

Publication number
JPS5757969A
JPS5757969A JP13272580A JP13272580A JPS5757969A JP S5757969 A JPS5757969 A JP S5757969A JP 13272580 A JP13272580 A JP 13272580A JP 13272580 A JP13272580 A JP 13272580A JP S5757969 A JPS5757969 A JP S5757969A
Authority
JP
Japan
Prior art keywords
pressure chamber
spool
secondary pressure
passage
pump
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
JP13272580A
Other languages
Japanese (ja)
Inventor
Michiaki Takizawa
Yoshimoto Unno
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.)
Nissei Plastic Industrial Co Ltd
Original Assignee
Nissei Plastic Industrial 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 Nissei Plastic Industrial Co Ltd filed Critical Nissei Plastic Industrial Co Ltd
Priority to JP13272580A priority Critical patent/JPS5757969A/en
Publication of JPS5757969A publication Critical patent/JPS5757969A/en
Pending legal-status Critical Current

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  • Safety Valves (AREA)

Abstract

PURPOSE: To reduce an overriding property, by providing a choke which has a restrictor and connects a circuit pressure chamber and a secondary pressure chamber on both the ends of a spool to each other.
CONSTITUTION: When both pumps 15, 16 are operating, a spool 2 is not dispalced by a spring 3 and disconnects a pump passage 6 and a tank passage 7 from each other. When the pressure of a secondary pressure chamber 5 has reached the set pressure level of a pilot valve 14, this valve is opened so that oil flows through a chock 10 and a difference is made between circuit pressure P1 and secondary pressure P3 by a restictor 11. As a result, the spool 2 compresses the spring 3 to displace it toward the secondary pressure chamber 5 to connect the pump passage 6 and the tank passage 7 to each other so that the discharge of the pump 16 is returned to a tank 19.
COPYRIGHT: (C)1982,JPO&Japio
JP13272580A 1980-09-24 1980-09-24 Unload valve Pending JPS5757969A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13272580A JPS5757969A (en) 1980-09-24 1980-09-24 Unload valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13272580A JPS5757969A (en) 1980-09-24 1980-09-24 Unload valve

Publications (1)

Publication Number Publication Date
JPS5757969A true JPS5757969A (en) 1982-04-07

Family

ID=15088118

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13272580A Pending JPS5757969A (en) 1980-09-24 1980-09-24 Unload valve

Country Status (1)

Country Link
JP (1) JPS5757969A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104998521A (en) * 2015-07-10 2015-10-28 浙江诸暨东港液压机械有限公司 Three-position three-way type pilot control valve of air dryer of commercial vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4825220A (en) * 1971-08-05 1973-04-02
JPS5122125A (en) * 1974-08-19 1976-02-21 Toyooki Kogyo Kk ATSURYOKUS EIGYOBEN

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4825220A (en) * 1971-08-05 1973-04-02
JPS5122125A (en) * 1974-08-19 1976-02-21 Toyooki Kogyo Kk ATSURYOKUS EIGYOBEN

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104998521A (en) * 2015-07-10 2015-10-28 浙江诸暨东港液压机械有限公司 Three-position three-way type pilot control valve of air dryer of commercial vehicle

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