FLOW CONTROL VALVE DEVICE
Document Type and Number:
Japanese Patent JP3456214
PURPOSE: To keep off any valve vibration in a pilot pressure control valve so as to perform stable flow control by means of a simple structural improvement.
CONSTITUTION: This valve device is provided with two pilot pressure control valves 2A, 2B for controlling the pilot pressure in a pilot flow control valve 1, and its back pressure chamber 21 is connected to the front stage output port 33 of a double hydraulic pump 3 for feeding the flow control valve with a pressure fluid. Pressure in the output pump 33 is boosted more than atmospheric pressure by a front stage pump 31, and each back pressure chamber 21 of these pilot pressure control valves 2A, 2B is connected to the suchlike output port 33, so that even in the case where these control valves 2A, 2B are throttled to same extent, a large differential pressure will not occur at all, thus a valve vibration due to cavitation is effectively prevented from occurring. Thus a simple change in the conventional structure is easily realizable.
August 01, 2003
March 16, 1992
TOYODA MACH WORKS LTD
F16K47/02; F16K47/00; (IPC1-7): F16K47/02