Title:
FLOW CONTROL VALVE
Document Type and Number:
WIPO Patent Application WO/1989/008291
Kind Code:
A1
Abstract:
A flow control valve requiring no additional safety valves, having a valve body which can be made easily and compactly, and capable of stabilizing the hydraulic oil, which is introduced from a hydraulic pump, without causing the pulsation of the inlet side hydraulic pressure. The flow control valve is provided in a single valve port (21) in a valve body (20) with a puppet valve (32), and a second spool valve (51) functioning as a safety valve, these valves (32), (51) being arranged in series in the axial direction of the valve port (21). The hydraulic oil introduced into a communication port (39) of the puppet valve (32) through an inlet port (23) in the valve body (20) is guided into back pressure chambers (38a, 38b) in the puppet valve (32) through a variable throttle (44), and from the back pressure chamber (38b) to the outer circumferential portion of the second spool valve (51). The hydraulic pressure on the side of the inlet port (23) is introduced into a pressure receiving chamber (56) of the second spool valve (51).
Inventors:
Karakama
Tadao, Ishizaki
Naoki, Takano
Toshiro, Nunotani
Sadao
Tadao, Ishizaki
Naoki, Takano
Toshiro, Nunotani
Sadao
Application Number:
PCT/JP1989/000203
Publication Date:
September 08, 1989
Filing Date:
February 28, 1989
Export Citation:
Assignee:
KABUSHIKI KAISHA KOMATSU SEISAKUSHO KARAKAMA
Tadao, Ishizaki
Naoki, Takano
Toshiro, Nunotani
Sadao
Tadao, Ishizaki
Naoki, Takano
Toshiro, Nunotani
Sadao
International Classes:
G05D7/01; G05D16/00; (IPC1-7): G05D7/01