Flow-Guard Filtration Division of Fresno Valves & Castings, Inc. has been manufacturing quality stainless steel filtration systems since 1985. This popular line of filtration equipment offers solutions for a wide variety of situations. Developed for use in agriculture, the line of Flow-Guard filters includes media filters , gravity screen filters and pressurised screen filters, all manufactured of durable stainless steel . Flow-Guard filters have been so successful in agriculture that other industrial applications have taken notice. Flow-Guard filters provide high quality, long lasting filtration.