JPH0353602U

JPH0353602U -

Info

Publication number: JPH0353602U
Application number: JP11573889U
Authority: JP
Priority date: 1989-09-29
Filing date: 1989-09-29
Publication date: 1991-05-23

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示したもので流体
制御装置を構成する各弁を線で連通した概要縦断
面図、第２図は本考案の一実施例の流体制御装置
を適用した制御回路図、第３図は本考案の他の実
施例を示した流体制御装置の概要縦断面図、第４
図は従来例を示した流体制御装置の概要縦断面図
である。１……パイロツト操作切換弁、２，２Ａ……制
御弁、３，３Ａ……選択弁、５……嵌合孔、６…
…切換弁体、７Ａ，７Ｂ……パイロツト室、８Ａ
，８ｂ，２６Ａ，２６Ｂ，２０……ばね、９Ａ，
９Ｂ……パイロツト圧力路、１０Ａ，１０Ｂ……
パイロツト弁、１１……パイロツト排出路、１５
，１７……流路、１８……弁孔、１９……制御弁
体、２１，２１Ａ……選択路、２２……制御室、
２３，２３Ａ……摺動孔、２４……選択弁体、２
５Ａ，２５Ｂ……圧力室、２７……圧力源、２８
……貯槽。 Fig. 1 shows an embodiment of the present invention, and is a schematic vertical sectional view in which the valves constituting the fluid control device are connected by lines, and Fig. 2 shows an embodiment of the fluid control device of the present invention. A control circuit diagram, FIG. 3 is a schematic vertical sectional view of a fluid control device showing another embodiment of the present invention, and FIG.
The figure is a schematic vertical sectional view of a fluid control device showing a conventional example. 1... Pilot operation switching valve, 2, 2A... Control valve, 3, 3A... Selection valve, 5... Fitting hole, 6...
...Switching valve body, 7A, 7B...Pilot chamber, 8A
, 8b, 26A, 26B, 20... Spring, 9A,
9B... Pilot pressure path, 10A, 10B...
Pilot valve, 11...Pilot discharge path, 15
, 17...flow path, 18...valve hole, 19...control valve body, 21, 21A...selection path, 22...control room,
23, 23A...Sliding hole, 24...Selection valve body, 2
5A, 25B...Pressure chamber, 27...Pressure source, 28
...Storage tank.

Claims

[Scope of utility model registration request]

A pressure path connected to the pressure source side, a discharge path connected to the storage tank side, and a pair of load paths connected to the actuator side are fitted into fitting holes spaced apart in the axial direction so as to be able to freely slide in the axial direction. The switching valve body is held in a neutral position where the pressure path is isolated from the discharge path by spring force,
A pair of pilot chambers are defined by a fitting hole and a switching valve element facing the switching valve element, and a pilot valve is provided to control the pressure of pilot fluid introduced into the pilot chamber from a pilot pressure path connected to a branch of the pressure path. and a pilot-operated switching valve that controls communication and isolation between each path by sliding the switching valve body from a neutral position to a switching position where the acting force based on the pressure of the pilot fluid in the pilot chamber and the spring force act in equilibrium. established,
The fluid in the pressure path that is movably housed in the valve hole, which has a flow path communicating with the pressure path of the pilot operated switching valve and a flow path connected to the storage tank side with an interval in the axial direction, and acts on one end of the flow path. The control valve body has a control valve body with a spring force applied thereto in opposition to the acting force based on the pressure of The control valve body moves to one end side against the acting force based on the pressure of the fluid in the control chamber and the spring force, thereby blocking the flow paths, and also directs the fluid in the control chamber toward the storage tank. A control valve is provided in which the control valve element moves to the other end side against the spring force due to the action force acting on one end and communicates between the flow paths, and connects the control chamber of the control valve to the storage tank side. It has a selection valve element that is slidably fitted into the sliding hole so as to communicate with the pilot discharge passage or to block communication to the pilot discharge passage, and a partition-forming valve element is provided opposite to the selection valve element. A pair of pressure chambers is connected to each pilot chamber of the pilot operated switching valve, and when the switching valve body of the pilot operated switching valve is in the neutral position, the selection valve body is held in the neutral position by the spring force and the control chamber of the control valve is connected. communicates with the pilot discharge passage, and when the switching valve element of the pilot operation switching valve is in the switching position, the selection valve element is pivoted to the switching position where the acting force based on the pressure of the pilot fluid in the pressure chamber and the spring force act in equilibrium. A fluid control device comprising a selection valve that slides in one direction to cut off communication of a control chamber of a control valve to a pilot discharge passage.