Single Stage Main Relief Valve PC120-6

This single stage main relief valve Model YH-013 belongs to Pressure Relief Valve, dedicated to 12-ton old LS load-sensing mini crawler excavators Komatsu PC100-6, PC120-6 and PC130-6 equipped with HPV75 variable displacement main pump, OEM Part No.723-30-90400 / 723-30-90101, commonly known as full system main safety valve. It is installed on main oil inlet cartridge cavity of main control valve, serving as core pressure stabilizing & safety component limiting maximum pressure of full machine hydraulic system. Cooperated with Hydraulic Safety Valve and Hydraulic Relief Valve, it forms two-stage hydraulic safety circuit together with LS selector valve, cylinder suction valve, travel/swing auxiliary relief valves to realize primary high-pressure protection for whole machine + secondary buffer protection for all branches. Standard system rated relief pressure reaches 32.5MPa (325bar), instantaneous impact peak pressure up to 34.0MPa, maximum system withstand pressure 35MPa, maximum s…