JPH0484903U

JPH0484903U -

Info

Publication number: JPH0484903U
Application number: JP13013690U
Authority: JP
Priority date: 1990-11-30
Filing date: 1990-11-30
Publication date: 1992-07-23

Description

[Brief explanation of the drawing]

第１図は本考案の方向制御弁の一実施例を示す
断面図、第２図はその方向制御機能を説明する断
面図、第３図はその方向制御弁にパイロツトリリ
ーフ回路を付加してオーバーロードリリーフ機能
を説明する断面図、第４図は従来の方向制御弁を
示す断面図である。１……ボデイ、Ｖａ，Ｖｂ……バルブアセンブ
リ、１ａ，１ｂ……シート部、２ａ，２ｂ……排
出用スプール、２ａｓ，２ｂｓ……テーパ状のシ
ール部、２ａｉ，２ｂｉ……パイロツト室、３ａ
，３ｂ……供給用スプール、３ａｉ，３ｂｉ……
パイロツト室、５ａ，５ｂ……バネ、１１……油
圧源、１２……タンク、１５……アクチエータ、
Ｐ……油圧源接続ポート、Ｔ……タンクポート、
Ａ，Ｂ……アクチエータ接続ポート、ＰＬａ，Ｐ
Ｌｂ……パイロツトライン。 Fig. 1 is a sectional view showing one embodiment of the directional control valve of the present invention, Fig. 2 is a sectional view illustrating its directional control function, and Fig. 3 is a sectional view showing the directional control valve with a pilot relief circuit added thereto. A sectional view explaining the load relief function, and FIG. 4 is a sectional view showing a conventional directional control valve. 1...Body, Va, Vb...Valve assembly, 1a, 1b...Seat portion, 2a, 2b...Discharge spool, 2as, 2bs...Tapered seal portion, 2ai, 2bi...Pilot chamber, 3a
, 3b... supply spool, 3ai, 3bi...
Pilot chamber, 5a, 5b...spring, 11...hydraulic source, 12...tank, 15...actuator,
P...Hydraulic power source connection port, T...Tank port,
A, B... Actuator connection port, PLa, P
Lb...Pilot line.

Claims

[Scope of Claim for Utility Model Registration] (1) In a directional control valve that displaces a spool by changing pilot pressure to switch and control the supply of oil from a hydraulic source to an actuator and the discharge of oil from an actuator to a tank, a discharge spool having a tapered seal portion that comes into contact with and separates from the seat portion of the body;
A valve assembly consisting of a supply spool inserted into the discharge spool from the direction in which the discharge spool is pressed against the seat of the body, and a spring for controlling the displacement of these spools is arranged in a pair. In each valve assembly, a pilot chamber for controlling the discharge spool is provided on the end face of the discharge spool on the side where the supply spool is not inserted, and between the supply spool and the discharge spool, A pilot chamber is provided for controlling the supply spools, and a pilot chamber is provided for each valve assembly such that remote control pilot pressure simultaneously displaces the supply spool of one valve assembly and the discharge spool of the other valve assembly. A directional control valve characterized by having a line. (2) A tank is connected to the actuator connection port in each valve assembly via a pilot relief valve and a throttle valve, and a pressure oil line is drawn out from between the pilot relief valve and the throttle valve, and a pilot line is connected to each valve assembly. 2. The directional control valve according to claim 1, wherein the directional control valve is connected to a pilot chamber for controlling a discharge spool in each valve assembly via a high-pressure selection valve.