a flow control valve includes a pressure compensating valve and a first switching valve . the pressure compensating valve is configured to enlarge an opening area of a variable orifice between a load pressure line and a compensating pressure line when a pressure of working fluid of the compensating pressure line is smaller than a first set pressure , and narrow the opening area of the variable orifice when the pressure of the working fluid of the compensating pressure line is larger than the first set pressure . the first switching valve is configured to switch between a meter - out operation and a neutral operation by an external operation , wherein the working fluid of the compensating pressure line is drained in the meter - out operation , the working fluid of the compensating pressure line is not drained in the neutral operation . the load pressure line guides the working fluid to be supplied to an actuator .