At least 5–10 feet below the lowest drawdown water level to ensure the valve remains submerged during pump operation. For deep wells, install the foot valve 10–20 feet above the well bottom to avoid sediment intake. Always verify with your pump manufacturer's recommended submergence depth.

Foot valves are designed for vertical installation with the strainer pointing downward. Installing a foot valve horizontally can cause the disc to hang improperly, leading to leakage or failure to open. If horizontal installation is required, use a spring-loaded silent check valve instead.

Use PTFE tape for NPT-threaded foot valves – wrap 4–6 turns in the direction of the thread. Avoid over-tightening; hand-tight plus 1–2 turns with a strap wrench is sufficient. For flanged connections, use a full-face gasket (EPDM or PTFE) and tighten bolts in a cross-pattern to the torque specified by the gasket manufacturer.

The foot valve size should match the suction line pipe diameter, not the pump discharge size. Oversizing increases cost without benefit; undersizing causes excessive pressure drop. As a rule: line size = foot valve size. For example, a 4" suction line requires a 4" foot valve. Confirm the end connection type (NPT, BSP, flanged) to match your pipe.

Absolutely. Select a bronze body or SS316 (CF8M) foot valve for seawater or brackish water. Thriveon offers bronze foot valves with stainless steel disc and EPDM seat – these resist corrosion and biofouling. For high-chloride environments, consider super duplex stainless steel for maximum longevity.

A foot valve is a type of check valve with an integrated strainer at the inlet, designed specifically for vertical pump suction lines. While both prevent backflow, a check valve lacks the strainer and is not optimized to hold water column weight. Do not substitute a check valve for a foot valve – you risk debris entering the pump and losing prime.

Inspect the strainer every 6–12 months for debris build-up. Clean with a wire brush or pressure washer – do not use chemical solvents that can damage the seat. Check the disc seal by performing a leak-back test: isolate the foot valve, fill the upstream pipe, and observe for any drop in water level over 15 minutes. Replace the seat ring if leakage is detected. Thriveon foot valves are designed for easy field servicing – all seat rings are available as spare parts.

For standard sizes (1/2"–6"), lead time is 25–30 days from order confirmation. Larger sizes up to 12" require 35–40 days. Minimum order quantity (MOQ) is 5 pieces for standard sizes and 2 pieces for large sizes. We offer sample orders for customer qualification – contact us for pricing and availability. We ship via sea (FOB Tianjin) or air (DDP available) to all US ports.