What is the function of suction and discharge isolation valves?

• A. It is to allow maintenance or testing by isolating the pump from the rest of the system.
• B. It prevents priming.
• C. It regulates discharge pressure.
• D. It provides emergency backup power.

Answer: (A)

The main idea is that suction and discharge isolation valves let you take the fire pump out of service without disturbing the rest of the system. By closing these valves, you can perform maintenance, inspections, or a pump test while the rest of the sprinkler system stays pressurized and intact. It’s about isolating the pump so you can work on it safely and then reopen the valves to restore normal operation. These valves aren’t meant to regulate discharge pressure, prevent priming, or provide power—those functions come from other parts of the system.