Orbit 1 in. FPT Anti-Siphon Valve with Flow Control - 24 VAC Solenoid, Above-Ground

The Orbit 1 in. FPT 100 Series Anti-Siphon Valve with Flow Control (57624) is an above-ground irrigation valve that prevents backflow using an integrated atmospheric vacuum breaker and adjustable flow control.

This anti-siphon valve is engineered to protect sprinkler and irrigation systems from contaminated backflow while giving installers straightforward control and maintenance access. Built for outdoor cold-water irrigation, the unit combines a poppet-style atmospheric vacuum breaker, a 24 VAC solenoid for automatic operation, and a manual actuation lever. Its inline flow adjustment and internal scrubber filter reduce clogs and let you fine-tune water delivery for each zone.

How does the valve stop water from flowing backward into my supply?

The valve includes an atmospheric vacuum breaker that opens to admit air as pressure drops, breaking any potential siphon. When the valve closes, the poppet automatically seals, preventing reverse flow into potable water lines. This design meets common anti-siphon installation practices and reduces contamination risk when installed correctly.

• Atmospheric vacuum breaker with poppet that closes on shutdown
• In-line forward-flow design to enforce one-way movement
• Above-ground placement on risers ensures proper air admission

What installation and wiring steps should I expect?

Install the valve at least 6 inches above the highest sprinkler head in the controlled zone to ensure the vacuum breaker functions properly. It mounts above ground on a riser for easy access and service, and uses standard 1 in. FPT connections. The integrated 24 VAC solenoid wires to common irrigation controllers; no special electronics are required.

• Above-ground riser mounting—minimum 6 inches above highest head
• 1 in. female pipe thread (FPT) connections for common plumbing setups
• 24 VAC solenoid compatible with major irrigation controllers

How can I adjust flow and keep the valve clog-free?

The valve has an integrated flow control that lets you throttle water to match zone needs without additional fittings. Inside, a scrubber-style filter screens debris to reduce nozzle and valve clogs. Together these features simplify balancing and decrease maintenance visits.

• Integrated flow control screw for on-site adjustment
• Internal scrubber filter traps grit and particulates
• Manual lever for on/off operation during servicing

Is this anti-siphon valve compatible with my controller and fittings?

The 24 VAC solenoid works with most common 24 VAC irrigation controllers, making it directly compatible with industry-standard systems. For quicker, glue-free connections, pair with PVC-Lock fittings where appropriate. Orbit recommends combining the valve with smart controllers for better water management, but it operates with any standard controller offering 24 VAC outputs.

• 24 VAC solenoid matches major controller brands
• Works with PVC-Lock fittings for fast, glue-free installation
• Pairs well with smart controllers for improved conservation

Who is this for: The Orbit 1 in. FPT 100 Series Anti-Siphon Valve is ideal for homeowners, landscape contractors, and growers who need reliable, above-ground backflow prevention for cold-water sprinkler zones. Choose this valve if you want a serviceable, controller-compatible solution with on-site flow adjustment and built-in debris protection. Note: intended for outdoor irrigation only and must be installed following local plumbing and backflow prevention codes.