| 摘要 |
A hydraulic control valve for a construction machine is provided, which can increase the driving speed of working devices, such as a boom and an arm, by making hydraulic fluid that is supplied to actuators of the working devices in a confluent state when the working devices are driven. The hydraulic control valve includes a boom spool slidingly coupled into a valve block to be shifted to control the hydraulic fluid supplied from a first hydraulic pump and a second hydraulic pump to the actuator and provided with an internal path, a supply path of the first hydraulic pump and a supply path of the second hydraulic pump which are formed to be vertically symmetrical about the boom spool, check valves elastically supported to open and close the supply path of the first hydraulic pump and the supply path of the second hydraulic pump, respectively, bridge paths formed to be horizontally and vertically symmetrical with respect to a path formed on a sliding surface of the valve block to supply the hydraulic fluid from the supply path of the first hydraulic pump and the supply path of the second hydraulic pump to the actuator, cylinder paths supplying the hydraulic fluid from the first hydraulic pump to the actuator if the boom spool is shifted, and a connection path supplying the hydraulic fluid from the second hydraulic pump to the internal path of the boom spool if the boom spool is shifted. |
