The most basic butterfly valve design is commonly called a concentric butterfly valves or resilient butterfly valves. In this type of valve, the stem is centered in the middle of the valve disc, which is centered in the pipe bore. This Concentric Butterfly Valves typically has a rubber (or resilient) seat and relies on the disc having a high level of contact with the seat to effect a seal. The disc will contact the seat the earliest during the 90 degree rotation. Dutco tenant have a complete range of butterfly valves sizes from 50 mm to 2000 mm This range of butterfly valves is suitable for Water applications. Rubber liner vulcanized on the body of the valve, allowing strong and reliable tightness, as well as the O ring cast on the body that prevents any need of gaskets. Short and Long body flanged Concentric Butterfly Valves are manufactured as concentric type disc; they can stand both directions of fluid and are maintenance-free. The body, not in contact with the fluid.