Flow rate control valve

A flow rate control valve comprising:

• a first control valve;
• a second control valve;
• a first flow line to connect to a first fluid line connected to a hydraulic actuator;
• a second flow line to connect to a second fluid line connected to the hydraulic actuator;
• a third flow line to connect to a third fluid line connected to a hydraulic pump, the hydraulic pump being configured to output operation fluid;
• a fourth flow line to connect to an operation fluid tank or a fourth fluid line connected to a suction portion of the hydraulic pump, the operation fluid tank storing operation fluid;
• a fifth flow line to connect the first control valve and the second control valve, the fifth flow line through which operation fluid having flown through the first flow line and the second flow line flows;
• a spool including:
• a first connecting portion having a first position and a second position, the first connecting portion being configured to connect the first flow line and the third flow line at the first position and to connect the first flow line and the fifth flow line at the second position;
• and
• a second connecting portion to connect the second flow line and the third flow line at the second position;
• and
• a sixth flow line to connect the fourth flow line and the fifth flow line, the sixth flow line being arranged to a location other than the spool.