Sun Hydraulics CBBD-LDN Counterbalance Valve Cartridge

The Sun Hydraulics CBBD-LDN is a semi-restrictive, pilot-assisted counterbalance valve cartridge designed for load holding and motion control applications. It features a 4.5:1 pilot ratio and fits the standard T-11A cavity. The valve allows free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. Pilot assist at port 3 lowers the effective relief setting. The LDN suffix denotes an adjustable pressure setting configuration. The floating style construction minimizes the possibility of internal parts binding due to excessive installation torque or cavity machining variations. Maximum operating pressure is 5000 PSI (345 bar). Rated flow capacity is 10 GPM (38 L/min). This cartridge is commonly applied in telescopic boom lifts, hydraulic excavators, manlifts, and cranes requiring stable load control.