When 5 inch hose is supplying a pump, there must be a ____ in the system.

When 5 inch hose is supplying a pump, there must be a ____ in the system.

• A. Pressure Intake Relief Valve
• B. Check Valve
• C. Air Damper
• D. Water Meter

Answer: (A)

When a large-diameter supply hose (like 5 inch) feeds a pump, the suction side can experience dangerous pressure buildup if the flow is constricted downstream or a valve is closed suddenly. A pressure intake relief valve is placed on the pump’s intake to automatically vent excess pressure that develops in the suction line. This keeps the pump from being damaged by surges, helps preserve the prime, and protects the hose and piping from stress. The other options don’t provide this protective function: a check valve prevents backflow but can hinder priming and create other suction issues; an air damper addresses air in the system rather than excess suction pressure; a water meter isn’t a firefighting protection device.

When a large-diameter supply hose (like 5 inch) feeds a pump, the suction side can experience dangerous pressure buildup if the flow is constricted downstream or a valve is closed suddenly. A pressure intake relief valve is placed on the pump’s intake to automatically vent excess pressure that develops in the suction line. This keeps the pump from being damaged by surges, helps preserve the prime, and protects the hose and piping from stress. The other options don’t provide this protective function: a check valve prevents backflow but can hinder priming and create other suction issues; an air damper addresses air in the system rather than excess suction pressure; a water meter isn’t a firefighting protection device.