Netafim 1in Combination Air/Vacuum Relief and Continuous Acting Air Vent

One Netafim Combination Air Vent Covers Both Failure Modes Two jobs live in one body here. On startup the large orifice discharges the column of air running ahead of the water. On shutdown it admits air just as fast, so the line never pulls a vacuum against the emitters. Once the system is pressurized the small orifice takes over as a continuous acting air vent, bleeding off the air that separates out of solution. The body is reinforced UV-protected nylon with no metal parts to rust, and the patented rolling seal opens and closes gradually instead of slamming. Placement and Sizing for a 1 Inch Air Vacuum Relief Valve Netafim’s spacing guidance is one vent every 1,500 feet along a mainline. Add one at the pump and filter station, and one at each dead end. Mount it vertically on a riser that matches the 1-inch NPT male inlet — laid on its side the float cannot seat. The float stays open until air pressure reaches 12 psi, so it clears a long fill before the water arrives. At 1.90 lbs and 5.51 inches wide, this Netafim air valve is heavier than the small plastic air relief valves growers put on drip laterals. That is the trade: it is sized for a mainline, not a single bed. Key Features Air/vacuum and continuous acting in one body: Large-orifice discharge on fill and intake on drain, plus small-orifice air release while the system runs. 250 psi maximum operating pressure: Model 65ARIB1 carries full mainline pressure, with a 150 psi version available where design pressure is lower. Reinforced UV-protected nylon body: No metal parts to rust or corrode in a filter shed or out in the field. Patented rolling seal: Gradual opening and closing dampens water hammer instead of triggering it, and the seal wipes itself clean each cycle. 1-inch NPT male inlet: Threads onto a standard riser at the pump station, a manifold high point or the end of a main. Technical Specifications Specification Value Model 65ARIB1 Function Combination air/vacuum relief + continuous acting air release Inlet Connection 1-inch NPT male Max Operating Pressure 250 psi Float Open Threshold Remains open to 12 psi air pressure Body Material Reinforced UV-protected nylon Seal Patented rolling seal, self-cleaning Width 5.51 in Height 3.93 in Weight 1.90 lbs Recommended Spacing Every 1,500 ft along mainlines