JPS5614670A - Logic valve - Google Patents

Logic valve

Info

Publication number
JPS5614670A
JPS5614670A JP8742279A JP8742279A JPS5614670A JP S5614670 A JPS5614670 A JP S5614670A JP 8742279 A JP8742279 A JP 8742279A JP 8742279 A JP8742279 A JP 8742279A JP S5614670 A JPS5614670 A JP S5614670A
Authority
JP
Japan
Prior art keywords
poppet
logic valve
valve
solenoid valve
logic
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
JP8742279A
Other languages
Japanese (ja)
Other versions
JPH0115751B2 (en
Inventor
Iwao Morikawa
Eiki Izumi
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 JP8742279A priority Critical patent/JPS5614670A/en
Publication of JPS5614670A publication Critical patent/JPS5614670A/en
Publication of JPH0115751B2 publication Critical patent/JPH0115751B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Fluid-Driven Valves (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To reduce the closing time required to close a logic valve after the discharge rate of a variable displacement hydraulic pump is decreased to around zero "0", by using the logic valve, which performs the fluid connection or disconnection of a hydraulic circuit through the closing or opening of a poppet, in a closed hydraulic circuit for controlling the pump.
CONSTITUTION: A poppet 10, conduit 13 connected to an actuator, spring 16, shuttle valves 22, 23 and solenoid valve 21 are provided in a logic valve. When the solenoid valve 21 is at position A, the higher pressure between pressures of conduits 12, 13 acts on the rear face of the poppet 10 and the poppet is thus pushed down by the pressure and spring 16 so that the logic valve is closed. On the contrary, when the solenoid valve 21 is at position B, the lower pressure between the pressures of conduits 12, 13 acts on the rear face of the poppet 10. In such a manner, the logic valve may not be opened simultaneously with an opening of the solenoid valve, thus prohibiting their corresponding actuators to work suddenly.
COPYRIGHT: (C)1981,JPO&Japio
JP8742279A 1979-07-12 1979-07-12 Logic valve Granted JPS5614670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8742279A JPS5614670A (en) 1979-07-12 1979-07-12 Logic valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8742279A JPS5614670A (en) 1979-07-12 1979-07-12 Logic valve

Publications (2)

Publication Number Publication Date
JPS5614670A true JPS5614670A (en) 1981-02-12
JPH0115751B2 JPH0115751B2 (en) 1989-03-20

Family

ID=13914429

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8742279A Granted JPS5614670A (en) 1979-07-12 1979-07-12 Logic valve

Country Status (1)

Country Link
JP (1) JPS5614670A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111007A1 (en) * 1982-06-02 1984-06-20 Hitachi Construction Machinery Co., Ltd. Control valve linking device
JPH01171902U (en) * 1988-05-24 1989-12-06

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111007A1 (en) * 1982-06-02 1984-06-20 Hitachi Construction Machinery Co., Ltd. Control valve linking device
EP0111007B1 (en) * 1982-06-02 1986-12-30 Hitachi Construction Machinery Co., Ltd. Control valve linking device
JPH01171902U (en) * 1988-05-24 1989-12-06

Also Published As

Publication number Publication date
JPH0115751B2 (en) 1989-03-20

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