| 摘要 |
A hydraulic circuit for heavy equipment is provided to maintain the constant pressure in the pilot signal path by discharging working fluid to the hydraulic tank when the working hydraulic exceeds the set pressure. A hydraulic circuit for heavy equipment comprises first switching valves(1,2,3) installed in the flow path of a first hydraulic pump(P1), second switching valves(4,5,6) installed in the flow path of a second hydraulic pump(P2), third switching valves(7,8) installed in the flow path of a third hydraulic pump(P3), a pilot signal path(11) connected to a pilot signal pressure supply path(22) of a fourth hydraulic pump(P4), a throttling unit(10) forming signal pressure in the pilot signal path, and a valve supplying the signal pressure of the pilot signal path to the signal pressure supply path when the signal pressure exceeding the pressure is formed in the pilot signal path.
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