Rain Bird 1" Anti-Siphon Irrigation Valve DASASVF100 — Built-In Flow Control & Vacuum Breaker

Rain Bird DASASVF100 is a professional-grade 1" anti-siphon irrigation valve with built-in flow control and a vacuum breaker for reliable above-ground backflow protection.

This heavy-duty valve is engineered for commercial and residential irrigation zones that require dependable automatic shutoff, adjustable flow, and prevention of backflow into the potable water supply. Built with a Buna-N diaphragm, an encapsulated low-power solenoid, and a patented vacuum breaker, the DASASVF100 replaces standard 1" anti-siphon valves and connects to any 24 VAC controller. Its reverse-flow design minimizes diaphragm stress, helping the valve stay closed if the diaphragm fails internally.

How does this valve prevent backflow and flooding?

The DASASVF100 features Rain Bird’s patented vacuum breaker and a reverse-flow chamber that work together to stop back-siphonage and reduce the risk of flooding should an internal diaphragm give way. The top-mounted bleed screw allows either automatic or manual venting to atmosphere, ensuring the line cannot siphon contaminated water back into the supply when installed properly.

• Patented vacuum breaker with bleed screw for manual or automatic operation
• Reverse-flow internal layout reduces diaphragm stress during failure
• Designed for above-ground installation at least 6" above the highest sprinkler head
• Meets I.A.P.M.O. and A.S.S.E. standards and is CSA approved

Can I fine-tune water delivery for specific zones?

Yes — the valve includes a top-mounted, easy-turn flow control knob so you can dial in the flow rate to optimize spray patterns and avoid misting or runoff. Adjusting flow at the valve helps create uniform coverage across the zone without changing the controller schedule.

• Flow range 0.2 to 40 GPM for broad application flexibility
• Knob allows incremental adjustments to match sprinkler performance
• For flows under 3 GPM or drip setups, install a 200-mesh filter upstream
• Helps reduce misting and overspray for better water efficiency

What materials and specs support durability and performance?

The valve is constructed for long service life in outdoor irrigation systems: a Buna-N (nitrile) diaphragm resists degradation in challenging water conditions and a captured-plunger, low-power solenoid conserves electricity while offering durable actuation. Stainless-steel fasteners and a threaded 1" female inlet/outlet provide sturdy connections.

• Buna-N diaphragm with water filter and captive spring for reliable sealing
• Encapsulated, low-power solenoid with captured plunger for durability
• Heavy-duty body with stainless screws and 1" female pipe threaded inlet/outlet
• Operating pressure range 15–150 psi to cover typical irrigation systems

How should I install and maintain this anti-siphon valve?

Install the valve above ground and position it at least 6 inches higher than the highest sprinkler head on the same branch. Before powering the system, use the external bleed screw to flush debris; follow local plumbing codes and never place another valve downstream of this anti-siphon unit.

• Mount at least 6" above the highest outlet on the valve line
• Flush the system manually using the external bleed screw before startup
• Use a 200-mesh filter upstream for flows below 3 GPM or for drip lines
• Connect to any standard 24 VAC irrigation controller

Who is this for: The Rain Bird DASASVF100 is intended for landscapers, irrigation contractors, commercial property managers, and homeowners who need an above-ground, code-compliant anti-siphon valve with adjustable flow. It suits projects that require a rugged valve capable of withstanding variable pressures and water quality, while offering straightforward field adjustments and reliable backflow protection.