Why should firefighters open the bleeder valve or drain valve between the control valve and cap?

Opening the bleeder valve or drain valve between the control valve and cap is crucial to ensure that any trapped pressure is released. Trapped pressure can create a dangerous situation, as it may lead to equipment malfunction or failure when the system is activated. By releasing this pressure, firefighters can operate their equipment safely and effectively, minimizing the risk of unexpected bursts or leaks that could occur if pressure were allowed to build up. This practice enhances operational safety and facilitates a smoother flow of water when needed during firefighting efforts.

While increasing water flow efficiency, lowering the risk of equipment damage, and preventing leakage during operation are important considerations, the primary purpose of opening the bleeder valve is to ensure that all internal pressure is safely released before proceeding with operations.