The Three-Port Counterbalance Valves — CB**. Counterbalance valves with pilot assist are meant to control an overrunning load. This solenoid-operatedway,position cartridge is a direct-acting, poppet-style directional valve. DTDFway, direct-acting, solenoid-operated directional blocking poppet valve (Series) CAPACITYgpm CAVITY: TA. M-Control, C-Poppet. Energizing the solenoid activates or deactivates the relief function. Proportional Control Amplifiers. Three-port counterbalance cartridges (with