FLOW DISTRIBUTION SYSTEM FOR AN EXCAVATING WORK AND A PIPE LAYING WORK WHICH CAN PREVENT THE TRAVEL SPEED OF A DEVICE FROM BEING RAPIDLY CHANGED

摘要

PURPOSE: A flow distribution system for an excavating work and a pipe laying work is provided to improve workability with the fast travelling speed.;CONSTITUTION: A flow distribution system for an excavating work and a pipe laying work comprises first and second hydraulic pumps(52,53), a pilot pump(54), a first working device(56), control valves(57,58,63,64,65), second working devices(60,61), an unloading valve(68), and a select valve(69). The first and second hydraulic pumps and the pilot pump are connected with an engine. The first working device is connected with the first hydraulic pump. The control valves are installed in a center bypass passage(77) of the first hydraulic pump, and control a flowing direction and the amount of hydraulic fluid supplied to the first working device. The second working devices are connected with the second hydraulic pump.;COPYRIGHT KIPO 2010