Which component controls the flow of AFFF solution to the AFFF sprinklers?

• A. Powertrol Valve
• B. Master SOPV
• C. Hycheck
• D. Service tank

Answer: (A)

The device that actually governs how much AFFF reaches the sprinklers is the motor-operated valve known as the Powertrol valve. It is wired to the foam control system and opened or modulated on command to control the discharge to the AFFF sprinklers, providing accurate flow and fast shutoff when the system is activated.

The other components have different roles: the Master SOPV is the main shut-off to isolate the foam system, not to regulate flow during discharge; the Hycheck is a check valve that prevents backflow; and the service tank simply holds the foam concentrate.