What do drain valves provide a way to drain after closing both the discharge valve and nozzle?

Drain valves serve a crucial role in the operation and maintenance of fire suppression systems by allowing for the effective drainage of fluid from components after both the discharge valve and nozzle have been closed. When these valves are shut, no further fluid can enter or exit the system, so the drain valve is essential in managing the remaining water in certain parts of the system.

In this context, the correct answer highlights the specific function of drain valves, which is to drain discharge fittings. Discharge fittings are the components through which water is expelled from the fire suppression system, and once they are closed, the ability to drain any residual water is necessary to prevent issues such as freeze damage in cold climates or corrosion over time. The drain valve provides a simple and effective means to clear out this water.

The other options—intake fittings and gated intakes—do not pertain directly to the drainage of water after closing the discharge mechanisms. These components are involved in bringing water into the system rather than removing it. By focusing on the drainage of discharge fittings, we can better appreciate the vital role that drain valves play in ensuring the longevity and reliability of fire suppression systems.