The DCV spool that connects all ports in the center position is called __________.

• A. Closed
• B. Open
• C. Float
• D. Tandem

Answer: (B)

In this DCV center position, all ports are connected through the valve’s passages, creating a continuous, low-resistance path for hydraulic fluid. That setup is what “open center” describes—the pressure line (P) and return line (T) are tied together, and the actuator ports (A and B) are also effectively connected, allowing fluid to circulate with little resistance even when no command is given. This contrasts with a closed center, where all ports are blocked in the center; a float center, where the actuator ports are linked to each other to let the load float; and tandem center, which uses a different internal routing. So the center configuration that connects all ports is called open center.