JPH03123167U

JPH03123167U -

Info

Publication number: JPH03123167U
Application number: JP3095390U
Authority: JP
Priority date: 1990-03-28
Filing date: 1990-03-28
Publication date: 1991-12-16

Description

[Brief explanation of drawings]

第１図は本考案の実施例を示す断面図、第２図
は従来例の断面図である。３０……油圧ポンプ、３１……操作弁、３２…
…油圧モータ、３３……カウンタバランス、３４
……弁本体、３９，４３……第１・第２スプール
、３７，４１……第１・第２ポンプ側ポート、３
８，４２……第１・第２アクチユエータ側ポート
、４９，５０……第１・第２受圧室、５２，５４
……第１・第２パイロツト通路。 FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 30...Hydraulic pump, 31...Operation valve, 32...
...Hydraulic motor, 33...Counter balance, 34
... Valve body, 39, 43 ... First and second spools, 37, 41 ... First and second pump side ports, 3
8, 42... First and second actuator side ports, 49, 50... First and second pressure receiving chambers, 52, 54
...First and second pilot passages.

Claims

[Scope of Claim for Utility Model Registration] In a counterbalance valve provided in a circuit that supplies pressure oil discharged from a hydraulic pump 30 to an actuator using an operation valve 31, a first pump side port 37 and a first
A first spool 39 that connects and blocks the actuator side port 38 and a second spool valve 43 that connects and blocks the second pump side port 41 and the second actuator side port 42 are provided, and the first spool 3
9 is moved toward the communicating position by the pressure of the second pump side port 41 and moved toward the blocking position by the first spring 40, and the second spool 43 is moved in the communicating direction by the pressure of the first pump side port 37. A counterbalance valve characterized in that the counterbalance valve is moved in the direction of shutoff by a second spring 44.