20 , October
This article classifies excavator hydraulic valves into main pump power control, main control valve distribution, actuator protection, and pilot auxiliary groups, explaining the working mechanisms of key components such as PC valves, LS valves, main relief valves, and boom holding valves along with common failure symptoms. It also covers repair standards and highlights YIKAN KOMSU’s quality assurance system for high-precision hydraulic valve production and aftermarket support.