JPS63195164U

JPS63195164U -

Info

Publication number: JPS63195164U
Application number: JP8697887U
Authority: JP
Priority date: 1987-06-04
Filing date: 1987-06-04
Publication date: 1988-12-15

Description

[Brief explanation of the drawing]

図面第１図はこの考案の実施例を示す断面図、
第２図は従来の方向制御弁の断面図である。１，２……アクチユエータポート、ＭＳ……メ
インスプール、ＳＳ……サブスプール、９……環
状溝、１０……スプリング室、１１……パイロツ
ト室、Ｐ……ポンプ、Ｔ……タンク、２３……供
給通路、２５……戻り通路、２６……オリフイス
、２７……連通孔。 Figure 1 is a sectional view showing an embodiment of this invention;
FIG. 2 is a sectional view of a conventional directional control valve. 1, 2... Actuator port, MS... Main spool, SS... Sub spool, 9... Annular groove, 10... Spring chamber, 11... Pilot chamber, P... Pump, T... Tank, 23... Supply passage, 25... Return passage, 26... Orifice, 27... Communication hole.

Claims

[Scope of utility model registration request]

A pair of actuator ports, a supply passage that is always in communication with the pump, and a return passage that is always in communication with the tank are formed in the valve body that has the main spool inside, and the sub spool that is installed inside the main spool is Its inner side faces the pilot chamber, and its outer side faces the spring chamber. When this sub-spool is in the normal position, communication between one actuator port and the return passage is cut off, while one side of the main spool At the switching position,
The other actuator port communicates with the supply passage, and the pilot chamber and the supply passage communicate with each other to move the sub-spool, and one actuator port returns via the annular groove of the sub-spool. In the directional control valve configured to communicate with the passage, the main spool is formed with an orifice that communicates one actuator port with the annular groove of the sub spool, and when the main spool is in a neutral position, the spring A directional control valve formed with a communication hole that communicates a chamber with a return passage.