The design of the basic Flat-Float-Cylindrical ARV has remained stagnant for almost 20 years. The SWG is a Combination Air/Vacuum Valve [ARV] designed for wastewater applications. It uses streamlined internals to significantly increase the flow performance under vacuum relief conditions. The SWG provides 30% more flow than some base designs. Research indicates that additional flow control devices will be able to deliver improvements of almost 60% over some of the base designs.
In many cases this will allow pipeline designers to use a 3 Vent-Tech®valve in place of a 4 valve (including savings on smaller tee-off fixtures and isolation valves).