Which component has the same basic configuration and operation as the make-up valve?

• A. Unloading valve
• B. Main Gate Valve
• C. Check Valve
• D. Globe Valve

Answer: (A)

Make-up and unloading valves share a simple, spring‑loaded, poppet-style arrangement with a seat. They’re normally closed and open to admit fluid when the system needs makeup, then reseat to maintain pressure. That basic setup—a valve that opens under a pressure differential to add fluid to keep the system at the right level—is why the unloading valve is the best match for the make-up valve.

The other valves serve different roles and have different configurations. A main gate valve uses a sliding gate to block or allow flow and isn’t meant for automatic makeup. A check valve is designed to permit flow in one direction only and prevent backflow. A globe valve provides throttling control with a plug moving toward a seat, mainly for regulating flow, not for makeup.