Manufactured with double flanged and double eccentric design. The flaps are made of the same material as the body and the flap ears are closed, the flap shaft sealing is fully ensured and corrosion formation in moving parts is prevented. This ensures long life with minimum maintenance. Flap seal sealing pressure plate is manufactured as stainless steel upon request. All bolts and nuts are stainless steel on surfaces in contact with water. The seat surface where the flap sealing gasket is located on the body is filled with stainless steel filler weld and processed at an angle to ensure full closure. The surface is polished to bring the surface roughness to N6(0.8^m). With the double eccentric design, the sealing gasket is not damaged during opening and closing and the operating torque values are minimised. First eccentricity moves the sealing axis out of the flap shaft axis. This clearance ensures full contact between the sealing gasket and the body site. The eccentricity moves the flapper shaft axis out of the valve axis. With this misalignment, the body is separated from the seat with a small movement in the direction of opening the flapper and the friction of the gasket against the seating surface is eliminated. All our butterfly valves have an actuator connection flange. With the specially designed gear box, opening and closing is done at low torque values, the gear box can be driven by the actuator when desired. Our gearboxes have IP 68 protection class. The flow coefficients (Kv) of butterfly valves are calculated with CFD software. Flow coefficients including diameter (DN 100 - DN 350) can be measured in our test setup (DN 100 - DN 350) in accordance with TS EN 1267 standard installed in our factory.