Automatic Backflow Prevention. Reliable System Protection. The GULF FIRE® Check Valve (Non-Return Valve) is designed to automatically prevent reverse flow in fire protection and water distribution systems. By allowing water to flow in one direction only, the valve protects pumps, pipelines, and critical system components from backflow damage and pressure surges. Manufactured from high-quality materials and engineered for smooth automatic operation, the check valve ensures dependable performance in sprinkler systems, riser lines, and pump installations.