Title:
FLOW CONTROL CIRCUIT OF CHANGEABLE MODE
Document Type and Number:
Japanese Patent JPS5874901
Kind Code:
A
Abstract:
PURPOSE:To select either a motive power matching mode of high motive power economization effect or a pressure matching mode good in control properties such as response, by shifting mode changeover valves under required load or at required time. CONSTITUTION:The discharge quantity control section of a variable pump 1 is regulated by a load sensing valve 17 responding to the pressure difference between the upstream and downstream sides of a throttle valve 3 provided in a main line 2 and the pressure difference is regulated to be nearly constant, so that motive power matching mode control is effected. The pressure difference between the upstream and downstream sides of the throttle valve 3 is regulated to be nearly constant by a pressure compensation valve 18 of by-pass type, so that pressure matching mode control is effected. Mode changeover valves 21, 71 are provided so that one of a pilot line 25 for transmitting the pressure at the upstream side of the throttle valve 3 to the pilot chamber 42 of the load sensing valve 17 and a pressure matching pilot line 46 is closed and the other is simultaneously opened.
Inventors:
MASUDA KENJI
Application Number:
JP17415481A
Publication Date:
May 06, 1983
Filing Date:
October 29, 1981
Export Citation:
Assignee:
DAIKIN IND LTD
International Classes:
G05D7/01; F15B11/00; F15B11/05; G05D7/00; (IPC1-7): F15B11/00; G05D7/00
Attorney, Agent or Firm:
Aoyama