JPS61135074U

JPS61135074U -

Info

Publication number: JPS61135074U
Application number: JP1939685U
Authority: JP
Priority date: 1985-02-12
Filing date: 1985-02-12
Publication date: 1986-08-22
Also published as: JPH0442563Y2

Description

[Brief explanation of the drawing]

第１図ないし第４図は本考案の一実施例による
４ポペツト弁を示す回路図であり、第１図はＳＯ
Ｌａ，ＳＯＬｂ共に非励磁の状態を示す回路図、
第２図はＳＯＬａ非励磁、ＳＯＬｂ励磁の状態を
示す回路図、第３図はＳＯＬａ，ＳＯＬｂ共に励
磁の状態を示す回路図、第４図はＳＯＬａ励磁、
ＳＯＬｂ非励磁の状態を示す回路図、第５図は同
実施例における切換機能を示すシンボル図、第６
図は同実施例の作用を説明する説明図、第７図は
従来の４ポペツト弁における切換機能を示すシン
ボル図である。Ｖ……主弁本体、１〜４……第１ないし第４の
ポペツト弁、１１〜１４……弁室、１１ｃ〜１４
ｃ……背後液室、２１〜２４……第１ないし第４
のポペツト弁体、３１〜３４……ばね、４５，４
６……第１および第２の２位置電磁切換弁、４１
，４３，４４，５１〜５４，５８，５９……パイ
ロツト流路、５５……圧力制御弁、５７……絞り
、６０……２位置パイロツト操作切換弁。 1 to 4 are circuit diagrams showing a four-poppet valve according to an embodiment of the present invention, and FIG.
A circuit diagram showing a state in which both La and SOLb are de-energized,
Figure 2 is a circuit diagram showing SOLa de-energized and SOLb excited, Figure 3 is a circuit diagram showing SOLa and SOLb both excited, Figure 4 is SOLa excited,
A circuit diagram showing the SOLb de-energized state, FIG. 5 is a symbol diagram showing the switching function in the same embodiment, and FIG.
The figure is an explanatory view for explaining the operation of the same embodiment, and FIG. 7 is a symbol diagram showing the switching function in a conventional four-poppet valve. V... Main valve body, 1-4... First to fourth poppet valve, 11-14... Valve chamber, 11c-14
c...Back liquid chamber, 21-24...1st to 4th
poppet valve body, 31-34... spring, 45,4
6...first and second two-position electromagnetic switching valve, 41
, 43, 44, 51 to 54, 58, 59... Pilot flow path, 55... Pressure control valve, 57... Throttle, 60... 2-position pilot operation switching valve.

Claims

[Claims for Utility Model Registration] A main valve body having a flow path P for supplying pressure liquid, two flow paths A and B connected to a liquid actuator, and a flow path R for discharging liquid; between the flow paths PA, between the flow paths PB, and between the flow paths AR
and the first to fourth valve chambers formed between the flow path BR and the flow path BR, and the valve chambers are respectively disposed within each valve chamber to open and close between the flow paths, and a part of the valve chamber is used as a rear liquid chamber. 1st
- A main valve having a fourth poppet valve body and a spring that applies a spring force to the poppet valve body, and rear liquid chambers and pressures of the first, second, third, and fourth valve chambers. A switching valve controls switching communication between a liquid supply channel and a liquid discharge channel, and the inlet side thereof is connected to the channel B via the liquid chamber behind the fourth valve chamber and the throttle. A pressure control valve that opens when a fluid pressure of a predetermined value or more is applied from path B is provided, and when the flow path PAB is in a position where it can communicate with the flow path PAB and the flow path R can be cut off by switching the switching valve, the flow path PAB is opened. The pressure liquid P is guided to the rear liquid chamber of the second valve chamber, and the second poppet valve is opened by the liquid pressure from the flow path B exceeding a predetermined value, thereby establishing communication between the flow path B and the flow path PA. When the flow path BR is in a position where the flow path BR can be communicated with the flow path PA, the pressure control valve is opened by a liquid pressure of a predetermined value or more from the flow path B, and the fourth poppet valve is opened. A four-poppet valve characterized in that the flow paths BR are configured to communicate with each other.