member of Hawle Austria Group
Butterfly Valves are valves that allow flow by 90° rotation of the disc. ÖZKAN butterfly valves are double eccentric and the rubber sealing ring is fixed to the disc with a one piece retaining ring. This design provides 100% sealing and enables the sealing ring replacement to be easily performed on site, without dismantling any other part and without requiring any special equipment.
Some of the advantages offered by the butterfly valve can be listed as follows;
The first eccentricity (e1) moves the sealing axis off the shaft axis. For this reason, a continuous contact between the sealing ring and the body seat is obtained. The second eccentricity (e2) moves the valve axis out of the valve axis. With the help of the second eccentricity, the sealing ring is released from the body seat by a small movement in the opening direction. The purpose of the second eccentricity is to eliminate the pressure on the rubber sealing ring during valve opening and to reduce abrasive friction.
When the valve is in the open position, the rubber sealing ring is completely free and there is no deformation of the sealing ring, even if the valve remains in the open position for years.
Design: EN 593 (replaces BS 5155 and DIN 3354.)
Nominal Diameters: DN 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 750, 800, 900, 1000 1100, 1200, 1300, 1400, 1500, 1600, 1700,1800, 2000, 2200, 2400, 2500.
Nominal Pressures: PN 10, PN 16, PN 25, PN 40, (PN 63 Option), CI 150, CI 300.
Connection Length: EN 558-1 Series13 and 14 (replaces BS 5155 and DIN 3202).
Flange Connection: EN 1092-2.
Optional Flange Conneciton: ANSI B 16.5, ASME B 16.5 ASME B 16.47 Series A, AWWA C 207 SANS 1123 (South Africa), AS 4087 - AS 2129 (Australia) ISO 7005, BS4504.
Operating Temperature: According to EN 1074 Standards.
Factory Tests: EN 1074, EN 12266.
The New Generation Gearbox (NGG) is a gear technology designed and developed by Özkan for superior and safe operation of butterfly valves. The NGG enables the one-quarter turn (90°) movement required by butterfly valves. The disc movement is limited in the fully open and closed position by the advanced technology adjusting nut system. The remarkable adjusting nut system prevents excessive movement of the disc. The self-locking (non-return) gear design guarantees the smooth operation and tightness of ÖZKAN butterfly valves at maximum specified pressure. NGG is designed to significantly reduce operational torques.
Lower weight, same model gearbox with different adapt to butterfly valves of all sizes and special perfect as stop technology are some of the features.
Some of the unique advantages of the Next Generation Gearbox are:
Özkan rubber covered Butterfly Valve series is specially designed for seawater and corrosive mediums applications. The inner surfaces of the body are coated with hard rubber for corrosion protection. The thickness and properties of the rubber used are determined according to customer request.
Combined Check Butterfly Valves offer the functions of Butterfly Valve and Hydraulic Damper Check Valve in a single valve. The valves are opened by hydraulic cylinder and closed with the help of counterweight. The valves are supplied with hydraulic power units. These valves are especially designed for non-stroke operation of pumps, but can also be used for other applications requiring emergency opening or closing. In order to fulfil the desired function, a suitable warning system must be integrated into the power unit and control panel of the valve.
ÖZKAN was founded in 1983. Initial products were steam and process valves. Main production line was changed to butterfly valves in later years. Today, ÖZKAN carries on its production with particularly butterfly valves, needle valves, check valves, dismantling joints and air release valves. ÖZKAN, who has assumed the quality as a main principle since its foundation, carries out its activities as a member of Hawle Austria Group since 2011.
