JPS5491802A - Electromagnetic valve type pump ejection control circuit - Google Patents

Electromagnetic valve type pump ejection control circuit

Info

Publication number
JPS5491802A
JPS5491802A JP15982177A JP15982177A JPS5491802A JP S5491802 A JPS5491802 A JP S5491802A JP 15982177 A JP15982177 A JP 15982177A JP 15982177 A JP15982177 A JP 15982177A JP S5491802 A JPS5491802 A JP S5491802A
Authority
JP
Japan
Prior art keywords
ejection
electromagnetic valve
pump
valve
flow
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
JP15982177A
Other languages
Japanese (ja)
Inventor
Toshihiko Kanbayashi
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.)
Daikin Industries Ltd
Original Assignee
Daikin 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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to JP15982177A priority Critical patent/JPS5491802A/en
Publication of JPS5491802A publication Critical patent/JPS5491802A/en
Pending legal-status Critical Current

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  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE: In oil-pressure type press machines, to reduce pressure loss at a time of large flow in the oil-pressure circuit, by providing an electromagnetic valve which controls the quantities of pump ejection and a variable resistor which is caused to operate by the operation of the valve.
CONSTITUTION: Electromagnetic valve 38 is provided on branch line 41 which is connected to yoke cylinder 43 of variable pump 15, and by the operation of this the quantity of ejection from variable pump 15 to main line 18 is changed from a large to small flow. At the same time, by means of resistance valve 20, of the double-pilot type, for example, which is placed between the branching point of branch line 41 and actuator 16, the pressure exerting on yoke cylinder 43 is prevented from falling below a specified value regardless of the decrease in the quantity of pump ejection. When the quantity of pump ejection is changed from small to large, the opening of resistance valve 20 increases with the increase of ejection quantity. In this way, it is possible to reduce pressure loss at the time of large flow, and at the same time to reduce the heat generation in oil corresponding to the flow resistance.
COPYRIGHT: (C)1979,JPO&Japio
JP15982177A 1977-12-28 1977-12-28 Electromagnetic valve type pump ejection control circuit Pending JPS5491802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15982177A JPS5491802A (en) 1977-12-28 1977-12-28 Electromagnetic valve type pump ejection control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15982177A JPS5491802A (en) 1977-12-28 1977-12-28 Electromagnetic valve type pump ejection control circuit

Publications (1)

Publication Number Publication Date
JPS5491802A true JPS5491802A (en) 1979-07-20

Family

ID=15701977

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15982177A Pending JPS5491802A (en) 1977-12-28 1977-12-28 Electromagnetic valve type pump ejection control circuit

Country Status (1)

Country Link
JP (1) JPS5491802A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5677675U (en) * 1979-11-22 1981-06-24

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5677675U (en) * 1979-11-22 1981-06-24

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