Patent ID: 7131368

Claim:
A variable regeneration valve for a heavy equipment comprising: a hydraulic pump; an actuator connected with the hydraulic pump; a control valve provided in a port between the hydraulic pump and the actuator, switched when an external pilot signal pressure is applied thereto, to control operation, stop, and direction of the actuator; a regeneration switching valve including a first piston provided between a return port of the actuator and a tank port to control hydraulic oil moving from the return port to the tank port and moved by the hydraulic oil discharged from the hydraulic pump, a switching spool switched by motion of the first piston to variably control an orifice rate of the return port and the tank port, a first elastic member elastically biasing the state of the tank port closed by pressurizing the switching spool against the first piston to its initial state, and a second piston elastically provided to oppose the switching spool by a second elastic member; a first damping orifice provided in a port that connects the hydraulic pump with the first piston; and a second damping orifice discharging the hydraulic oil leaked from the hydraulic pump to a piston chamber through the first piston and the switching spool.