What is the purpose of a sprinkler system test valve (test/drain) in dry-pipe/deluge assemblies?

• A. It helps prevent unauthorized draining of the system.
• B. It allows testing and draining of the system to verify valve operation and maintain water supply integrity.
• C. It activates the alarm when a head is moved.
• D. It automatically refills the system after testing.

Answer: (B)

In dry-pipe and deluge sprinkler systems, the test/drain valve provides a controlled way to both test the system and drain it for maintenance. When you open this valve, you can introduce water into the piping to verify that the dry-pipe valve and the overall water delivery path will operate as intended, and you can drain the network to purge air and inspect for leaks or issues. This keeps the system ready and ensures the water supply will reach the sprinklers when needed. It isn’t about preventing unauthorized draining, triggering alarms, or automatically refilling the system—that’s handled by other components or procedures.