JPH0373712U - - Google Patents
Info
- Publication number
- JPH0373712U JPH0373712U JP13481989U JP13481989U JPH0373712U JP H0373712 U JPH0373712 U JP H0373712U JP 13481989 U JP13481989 U JP 13481989U JP 13481989 U JP13481989 U JP 13481989U JP H0373712 U JPH0373712 U JP H0373712U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- port
- main spool
- flow rate
- blind hole
- 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
- Component Parts Of Construction Machinery (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (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、３０……主スプール、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、４５……戻り配管、６０……
盲穴、６６……安全弁。
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, 30... Main spool, 32... Inlet port, 33... Outlet port, 35... Seat,
40... Operation valve, 41, 43... First and second ports, 42... Piping, 45... Return piping, 60...
Blind hole, 66...safety valve.
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、前記主スプール３０に入口ポート３２に
開口した盲穴６０を形成し、この盲穴６０をタン
ク側に連通・遮断する安全弁６６を主スプール３
０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及び安全
弁６６のドレーン側を戻り配管４５でタンクに連
通したことを特徴とする作業機シリンダの急速落
下防止装置。[Claims for Utility Model Registration] A flow rate control valve 28 and a load check valve that are equipped with a main spool 30 that slides in response to a lowering signal to communicate an inlet port 32 and an outlet port 33, and has a seat 35 that presses against the seat surface. 27 to the valve body 22
A blind hole 60 opened to the inlet port 32 is formed in the main spool 30, and a safety valve 66 is provided in the main spool 3 to communicate and shut off the blind hole 60 to the tank side.
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 and the drain side of the safety valve 66 are connected to the tank through a return pipe 45. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13481989U JPH0373712U (en) | 1989-11-22 | 1989-11-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13481989U JPH0373712U (en) | 1989-11-22 | 1989-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0373712U true JPH0373712U (en) | 1991-07-24 |
Family
ID=31682126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13481989U Pending JPH0373712U (en) | 1989-11-22 | 1989-11-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0373712U (en) |
-
1989
- 1989-11-22 JP JP13481989U patent/JPH0373712U/ja active Pending