JPH0373711U - - Google Patents
Info
- Publication number
- JPH0373711U JPH0373711U JP13481889U JP13481889U JPH0373711U JP H0373711 U JPH0373711 U JP H0373711U JP 13481889 U JP13481889 U JP 13481889U JP 13481889 U JP13481889 U JP 13481889U JP H0373711 U JPH0373711 U JP H0373711U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- port
- working machine
- machine cylinder
- load check
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002265 prevention Effects 0.000 claims description 2
Landscapes
- Operation Control Of Excavators (AREA)
- Component Parts Of Construction Machinery (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の実施例を示す断面図、第２図
は従来例の断面図である。
２０……作業機シリンダ、２０ａ……上げ室、
２０ｂ……下げ室、２１……落下防止弁、２２…
…弁本体、２７……ロードチエツク弁、２８……
流量制御弁、３２……入口ポート、３３……出口
ポート、３５……シート、４０……操作弁、４１
，４３……第１・第２ポート、４２……配管、４
５……戻り配管。
FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 20... Work machine cylinder, 20a... Raising chamber,
20b... Lowering chamber, 21... Fall prevention valve, 22...
...Valve body, 27...Load check valve, 28...
Flow rate control valve, 32... Inlet port, 33... Outlet port, 35... Seat, 40... Operation valve, 41
, 43...first and second ports, 42...piping, 4
5...Return piping.
Claims (1)
ポート３３を連通し、かつシート面に圧着するシ
ート３５を有する主スプール３０を備えた流量制
御弁２８及びロードチエツク弁２７を弁本体２２
に設けて落下防止弁２１とし、 この落下防止弁２１のロードチエツク弁２７の
入口側を配管４２で操作弁４０の第１ポート４１
に連通し、出口側を作業機シリンダ２０の上げ室
２０ａに連通し、作業機シリンダ２０の下げ室２
０ｂを操作弁４０の第２ポート４３に連通し、 前記流量制御弁２８の出口ポート３３を戻り配
管４５でタンクに連通した作業機シリンダの急速
落下防止装置。[Claims for Utility Model Registration] A flow control valve 28 and a load check valve equipped with a main spool 30 having a seat 35 that slides in response to a lowering signal to communicate an inlet port 32 and an outlet port 33 and presses against the seat surface. 27 to the valve body 22
The inlet side of the load check valve 27 of this fall prevention valve 21 is connected to the first port 41 of the operation valve 40 by a pipe 42.
The outlet side communicates with the raising chamber 20a of the working machine cylinder 20, and the lowering chamber 2 of the working machine cylinder 20
0b is connected to the second port 43 of the operation valve 40, and the outlet port 33 of the flow rate control valve 28 is connected to the tank through a return pipe 45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13481889U JPH0373711U (en) | 1989-11-22 | 1989-11-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13481889U JPH0373711U (en) | 1989-11-22 | 1989-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0373711U true JPH0373711U (en) | 1991-07-24 |
Family
ID=31682125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13481889U Pending JPH0373711U (en) | 1989-11-22 | 1989-11-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0373711U (en) |
-
1989
- 1989-11-22 JP JP13481889U patent/JPH0373711U/ja active Pending
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