JPS63125205U

JPS63125205U -

Info

Publication number: JPS63125205U
Application number: JP1655087U
Authority: JP
Priority date: 1987-02-09
Filing date: 1987-02-09
Publication date: 1988-08-16

Description

[Brief explanation of drawings]

第１図は、この考案の実施例に係る油圧回路図
、第２図は、従来例に係る油圧回路図である。１……駆動用油圧ポンプ、２，３……シリンダ
、４……油圧モータ、５，６，７……方向切換弁
、８，９……リリーフ弁、１０……パイロツト用
油圧ポンプ、２５……パイロツト管路、２７……
管路。 FIG. 1 is a hydraulic circuit diagram according to an embodiment of this invention, and FIG. 2 is a hydraulic circuit diagram according to a conventional example. DESCRIPTION OF SYMBOLS 1... Hydraulic pump for drive, 2, 3... Cylinder, 4... Hydraulic motor, 5, 6, 7... Directional switching valve, 8, 9... Relief valve, 10... Hydraulic pump for pilot, 25... ...Pilot conduit, 27...
conduit.

Claims

[Scope of utility model registration request]

An actuator, a drive hydraulic pressure source that supplies pressure fluid to the actuator, a direction control valve that controls the direction of the pressure fluid supplied from the drive hydraulic pressure source to the actuator, and a control valve that controls the pressure in the circuit at least on the low pressure side. and a hydraulic circuit comprising at least two pressure control valves each holding the pressure at two set values on the high pressure side, and selection means for selecting one of the two set values via these pressure control valves. ,
An external hydraulic pressure source is communicated with a pressure control valve to be maintained at a set value on the low pressure side, and a pressure is applied to the pressure control valve to prevent valve operation to be maintained at the set value. A hydraulic circuit comprising: a pipe line that can be introduced from the hydraulic pressure source; and a valve means that is interposed in the pipe line and sets whether or not the pressure can be introduced.