JPH02150479U

JPH02150479U -

Info

Publication number: JPH02150479U
Application number: JP5651189U
Authority: JP
Priority date: 1989-05-18
Filing date: 1989-05-18
Publication date: 1990-12-26

Description

[Brief explanation of drawings]

第１図は本考案の実施例縦断面図、第２図は本
考案の流量制御弁を用いて旋回体の制御システム
を構成した実施例断面図、第３図は第２図に示し
た供給弁の拡大縦断面図、第４図は従来の旋回体
の制御システムを示す模式図である。１……弁本体、２……入口ポート、３……出口
ポート、４……パイロツト圧導入ポート、６……
スリーブ、７……弁座、１１……ポペツト弁、１
２……円錐部、１４……パイロツトスプール弁、
２０……カバー、２１……背圧室、２３……大バ
ネ、２５……ピストン、２６……リモコン圧導入
ポート、２９……中バネ、３１……小バネ、３５
……パイロツトポペツト弁、３７……固定絞り。 Figure 1 is a longitudinal sectional view of an embodiment of the present invention, Figure 2 is a sectional view of an embodiment of a control system for a rotating body using the flow control valve of the present invention, and Figure 3 is the supply shown in Figure 2. FIG. 4, an enlarged longitudinal cross-sectional view of the valve, is a schematic diagram showing a conventional control system for a revolving structure. 1... Valve body, 2... Inlet port, 3... Outlet port, 4... Pilot pressure introduction port, 6...
Sleeve, 7... Valve seat, 11... Poppet valve, 1
2...Conical part, 14...Pilot spool valve,
20... Cover, 21... Back pressure chamber, 23... Large spring, 25... Piston, 26... Remote control pressure introduction port, 29... Medium spring, 31... Small spring, 35
...Pilot poppet valve, 37...Fixed throttle.

Claims

[Claims for Utility Model Registration] In a poppet-type flow control valve that communicates or blocks an inlet port and an outlet port of pressure fluid and controls the flow rate by the stroke when communicating, A valve body 1 having an introduction port 4 and an oil drain port 5; A sleeve 6 having a valve seat 7 and fitted into the valve body 1; A sleeve 6 slidably inserted into the sleeve 6 and having the valve seat 7. a poppet valve 11 having a conical portion 12 selectively seated in the spring chamber 24 and a remote control pressure introduction port 26;
and oil drain ports 27 and 28, and the valve body 1
is attached to the back pressure chamber 2 of the poppet valve 11.
1; a pilot spool valve 14 slidably inserted into the poppet valve 11 in the axial direction; and a remote control pressure from a remote control pressure introduction port 26 provided in the spring chamber 24. a piston 25 that is displaced integrally with the pilot spool valve 14 in accordance with the movement of the poppet valve 1 provided in the back pressure chamber 21
a first spring 23 that biases the piston 25 in the direction in which the piston 25 is seated on the valve seat 7; a third spring 29 that biases the pilot spool valve 14 in a direction opposite to the biasing direction of the second spring 29;
a spring 31; a pilot poppet valve 35 that opens when the load pressure exceeds a predetermined pressure and communicates the exhaust pressure chamber 32 containing the third spring 31 with the system circuit; The pilot spool valve 14 has a first position where the pilot pressure introduced from the pilot pressure introduction port 4 is introduced into the back pressure chamber 21, and a first position where the pilot pressure introduced from the pilot pressure introduction port 4 is introduced into the back pressure chamber 21; The oil drain port 5 is disconnected from the pressure introduction port 4 and has a back pressure chamber 21 in the valve body.
The pilot spool valve 14 is displaced integrally with the piston 25 by introducing remote control pressure from the remote control pressure introduction port 26, and in response to the displacement of the pilot spool valve 14. The poppet type flow control valve is characterized in that the back pressure of the poppet valve 11 is supplied and discharged from the poppet valve 11, and the poppet valve 11 is displaced in accordance with the displacement of the pilot spool valve 14.