JPH0449201U

JPH0449201U -

Info

Publication number: JPH0449201U
Application number: JP9165090U
Authority: JP
Priority date: 1990-08-31
Filing date: 1990-08-31
Publication date: 1992-04-27
Anticipated expiration: 2005-08-31
Also published as: JP2535422Y2

Description

[Brief explanation of drawings]

第１図ないし第３図は本考案の一実施例を示し
、第１図は電流制御式方向流量制御弁の縦断面図
、第２図は第１図の要部の拡大断面図、第３図
は第１図の電流制御式方向流量制御弁を記号で示
し並列的に３個用いた回路図、第４図は従来例を
示した電流制御式方向流量制御弁の縦断面図であ
る。１５……主弁本体、１６……主弁、１８……切
換スプール（切換弁体）、２０Ａ，２０Ｂ……パ
イロツト室、２１Ａ，２１Ｂ……ばね、２２Ａ，
２２Ｂ……弁座、２６Ａ，２６Ｂ……パイロツト
弁、２７Ａ，２７Ｂ……ばね、２８Ａ，２８Ｂ…
…パイロツト弁体、３８Ａ，３８Ｂ……切換部材
、４１Ａ，４１Ｂ……ばね。 1 to 3 show one embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of a current-controlled directional flow control valve, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. The figure is a circuit diagram in which three current-controlled directional flow control valves shown in FIG. 1 are used in parallel, and FIG. 4 is a longitudinal sectional view of a conventional current-controlled directional flow control valve. 15...Main valve body, 16...Main valve, 18...Switching spool (switching valve body), 20A, 20B...Pilot chamber, 21A, 21B...Spring, 22A,
22B...Valve seat, 26A, 26B...Pilot valve, 27A, 27B...Spring, 28A, 28B...
...Pilot valve body, 38A, 38B...Switching member, 41A, 41B...Spring.

Claims

[Scope of utility model registration request]

The switching valve body, which is slidably fitted into the main valve body, is held in a neutral position by spring force, and the pilot fluid is flowed into the pilot chambers formed at both ends of the switching valve body, and the pilot fluid pressure is A main valve that controls the flow direction and flow rate of fluid by sliding the switching valve body from a neutral position to a position where the acting force and spring force are balanced, and a pilot passage that connects the pilot chamber of the main valve to the low pressure side. It has a pilot valve body that can be freely attached to and removed from a formed valve seat and is biased in the seating direction by a spring force, and controls the pilot fluid pressure in each pilot chamber to decrease according to an increase in the energized current value, and also decreases the energized current value. A force based on the energized current value is applied to the pilot valve body in opposition to the spring force so as to perform upward control in response to a decrease in the amount of current. Two pilot valves that slide and operate the switching valve body, and two switching members that disconnect communication between the pilot chamber and the low pressure side of the main valve so that the switching valve body can be operated manually, which is different from the operation of the switching valve body by the pilot valve. a current-controlled directional flow rate control valve, each switching member being manually operable from a first position that cuts off the pilot chamber and the low pressure side to a second position that communicates the pilot chamber and the low pressure side; .