These anti-siphon valves are corrosion resistant
Used mainly to prevent gravity-induced siphonage from storage tanks, the Series RVDT remains closed under the pressure created by the presence of liquid in a tank, but opens under pump pressure. The pressure setpoint is adjustable from 5 to 150 psi. Once the set pressure is reached, the valve begins to open. It will allow the rated full flow at approximately 40% over the set pressure. Anti-siphon valves are available in pipe sizes from¼–2 in., with various body materials, including Grade 1, Type 1 polyvinylchloride, polypropylene, Corzan, Kynar and Teflon. Flowrates range from 2 to 75 gal/min.— Plast-O-Matic Valves, Inc., Cedar Grove, N.J.