Orbit 3/4" FPT 100 Series Anti-Siphon Automatic Sprinkler Valve — 24 VAC Compatible, Flow Control

Orbit 57623 is a 3/4" FPT automatic anti-siphon sprinkler valve that prevents backflow while giving manual and 24 VAC control plus adjustable flow.

This anti-siphon valve combines an atmospheric vacuum breaker and inline flow control in a weather-resistant plastic body for above-ground residential irrigation. It is engineered for easy installation on risers, routine maintenance, and compatibility with standard 24 VAC controllers. The valve’s poppet-style vacuum breaker automatically seals when water flow stops, and an internal scrubber filter helps keep debris from impairing operation.

How does this valve stop contamination from entering household water?

The valve integrates an atmospheric vacuum breaker that interrupts siphon events and prevents backflow into potable lines. When water pressure drops or the valve closes, the breaker allows air in to break any siphon and then seals to keep contaminants out.

• Atmospheric vacuum breaker prevents negative pressure suction
• Poppet design closes automatically when flow stops
• Non-corrosive plastic construction resists outdoor weathering

What controls and adjustments are available for irrigation tuning?

You can operate the 57623 with a 24 VAC solenoid from any major controller, or use the manual on/off lever for local control. The integrated flow control dial lets you fine-tune output to balance zones without shutting the whole system down.

• 24 VAC solenoid compatible with common controllers
• Manual actuation lever for quick testing or emergency shutoff
• Flow control knob for precise zone balancing

How simple is installation and routine maintenance?

The valve is intended for above-ground mounting on risers and pairs with PVC-Lock fittings for glue-free connections. An internal scrubber filter and a bleed screw make flushing, testing, and clearing debris straightforward.

• Install at least 6 inches above the highest sprinkler head per guidelines
• PVC-Lock fittings enable fast, solvent-free setup
• Built-in filter reduces clogging and a bleed screw eases testing

Will this valve work with my existing sprinkler controller and layout?

The Orbit 57623 is a universal-style valve designed for standard residential 24 VAC systems and works with most controller brands. It is sized as a 3/4" FPT fitting and meant for cold-water outdoor irrigation zones where above-ground anti-siphon devices are permitted.

• Standard 3/4" FPT connections fit common layouts
• 24 VAC compatibility with typical irrigation controllers
• Best suited for above-ground riser installations and cold water use only

Who this is for: homeowners, landscape contractors, and small-scale growers who need a reliable, easy-to-service backflow prevention valve for residential sprinkler zones. Choose this model when you want an above-ground anti-siphon assembly that’s controller-friendly, simple to install with PVC-Lock fittings, and built to resist outdoor exposure while reducing maintenance downtime.