Title:
FLUID PRESSURE DRIVE CONTROLLER
Document Type and Number:
Japanese Patent JPS5874904
Kind Code:
A
Abstract:
PURPOSE:To secure pressure for starting a specific actuator which needs high pressure, by providing a pilot valve which is shifted together with a changeover valve for the actuator in response to common pilot pressure. CONSTITUTION:A variable-capacity pump 31 and a fixed-capacity pump 32 are coupled to a common prime mover 33. A pilot valve 45 comprises an operating lever 46 and two pressure reducing valves 47, 48. Pilot passages 50, 52 are connected to a regulator 57 for the pump 31 through check valves 54, 55 and a passage 56. Pilot pressure proportional to the angle of operation of the lever 46 is conducted to the pilot chamber 51 or 53 of a changeover valve 36 to shift the valve and simultaneously control the quantity of inclination of the pump. A check valve 37 provided in pump lines for the changeover valves 36, 38 is caused to perform sequence action to set the pump discharge pressure at a desired high level.
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Inventors:
SAKAMOTO HIROKATSU
OOHASHI MASAO
OOHASHI MASAO
Application Number:
JP17402581A
Publication Date:
May 06, 1983
Filing Date:
October 29, 1981
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD
International Classes:
F15B11/16; (IPC1-7): F15B11/22
Attorney, Agent or Firm:
Kenzo Ota