FREE-Valve Suppliers | Pricing&Custom Solutions

Application and Maintenance Guide

The FREE-Valve tag refers to valveless filtration systems—automatic water filters that operate without mechanical valves. Instead, they use hydraulic siphon principles to perform filtration and self-cleaning (backwash) cycles automatically. These are commonly used in industrial water treatment, cooling towers, and municipal filtration.

Key parameters to note: Filtration rate is typically 8–10 m/h; backwash intensity around 15 L/m²·s; backwash duration usually lasts 4–5 minutes. The system requires sufficient inlet head (2–3 meters above the filter bed) to initiate siphon action. Filter media (e.g., quartz sand or anthracite) must be selected based on raw water quality.

Important cautions: Always remove air from the system during startup—air pockets prevent siphon formation. Avoid long-term operation with influent turbidity above 20 NTU, as it may cause media clogging. Keep siphon auxiliary tubes clear to ensure reliable automatic backwashing.

Maintenance tips: Inspect the siphon system monthly for blockages. Perform manual backwashing or partial media replacement quarterly if pressure drop increases abnormally. In cold climates, drain or insulate the unit to prevent freezing damage. Keep logs of backwash frequency and water quality to monitor performance trends.

Related product usage tips may vary depending on application scenarios and specific product designs. Please always refer to the actual product documentation and technical manuals for accurate guidance.