Which valve is required to be activated at all times except when pumping over 250 psi? Activation of this valve consists of pulling the lever out no more than 1/3 of the way out if the master discharge is above 100 psi.

Which valve is required to be activated at all times except when pumping over 250 psi? Activation of this valve consists of pulling the lever out no more than 1/3 of the way out if the master discharge is above 100 psi.

• A. Tank Fill/Recirculating Valve, 250 psi
• B. Engine Cooler Valve, 150 psi
• C. Tank To Pump Valve, 100 psi
• D. Intake/Compound Gauge, 200 psi

Answer: (A)

The valve in question is used to keep the pump cooled and primed by allowing a small amount of water to recirculate back to the tank while you’re pumping. It’s designed to be active during most pumping operations, but you turn it off or limit it when you’re delivering very high nozzle pressures, because recirculation would waste flow and lower the nozzle pressure. The described action—pulling the lever out only about one-third of the way when the master discharge is above 100 psi—provides a controlled, minimal recirculation to cool and prime without significantly reducing the discharge pressure. This matches the Tank Fill/Recirculating Valve, whose purpose is to manage recirculation during pumping. The other valves have different roles (engine cooling, moving tank water to the pump, or gauges), so they don’t fit the described operation.

The valve in question is used to keep the pump cooled and primed by allowing a small amount of water to recirculate back to the tank while you’re pumping. It’s designed to be active during most pumping operations, but you turn it off or limit it when you’re delivering very high nozzle pressures, because recirculation would waste flow and lower the nozzle pressure. The described action—pulling the lever out only about one-third of the way when the master discharge is above 100 psi—provides a controlled, minimal recirculation to cool and prime without significantly reducing the discharge pressure. This matches the Tank Fill/Recirculating Valve, whose purpose is to manage recirculation during pumping. The other valves have different roles (engine cooling, moving tank water to the pump, or gauges), so they don’t fit the described operation.