Flow control valve for construction machinery

#This application is the National Phase application of International Application No. PCT/KR2011/005089 filed on Jul. 12, 2011, which is incorporated herein by reference in its entirety.

#The present invention relates to a flow control valve for a construction machine. More particularly, the present invention relates to a flow control valve for a construction machine, which can limit a part of hydraulic fluid that is supplied to a working device side by a spool of a priority valve that is shifted simultaneously or release the limiting function through shifting of the priority valve to a neutral position by pilot signal pressure that is separately applied according to a type of work when a combined operation for simultaneously operating a working device, such as an arm, and a swing device is performed.

#Generally, in a hydraulic system that is applied to a construction machine, such as an excavator, a plurality of hydraulic pumps are connected to an engine. A left traveling device (TL) and a working device, such as a boom or a bucket, are connected to one of the hydraulic pumps, and a right traveling device (TR), a working device, such as an arm, an option device, and a swing device are connected to the other of the hydraulic pumps.

#The above objects, other features and advantages of the present invention will become more apparent by describing the preferred embodiments thereof with reference to the accompanying drawings, in which:

#FIG. 1 is a schematic cross-sectional view of a flow control valve for a construction machine in the related art; and

#FIG. 2 is a schematic cross-sectional view of a flow control valve for a construction machine according to an embodiment of the present invention.

#1, 2: connection port

#3: valve block

#4: pump path