ARI-Armaturen recently debuted their new double offset, metallic sealing high performance valve: the ZEDOX. As a leading global valve manufacturer, ARI-Armaturen’s latest addition to its notable suite of butterfly valves promises reliable tightness and high performance under tough process conditions.
The double eccentric butterfly valve is not a new concept and is used extensively in a wide range of industries including water supply and sewage, food, textile, petroleum, paper and hydropower. This type of valve works primarily on the basis that the axis of the stem (the disc’s point of rotation) deviates from two central positions (vertically and horizontally). This allows tight sealing, reduced opening resistance and significantly less contact between the disc and the valve seat. This results in quick open close response times and improved service life.
In the ZEDOX, the angle of the disc when entering into contact with the seat sealing ring has been reduced and relieves the metallic sealing when opening. The new valve promises a longer service life by reducing the contact pressure, thus minimizing friction and allowing protection of the seat sealing ring against negative flow influences. The design incorporates a streamlined bearing and the shape of the valve disc offers high-energy efficiency. The design also ensures bi-directional tightness as well as low torques that facilitate easy handling.
Depending on the sealing ring material, the ZEDOX is reliably tight at temperatures from -40°C up to 260°C, for pressure classes PN 10 to PN 40 plus ANSI Class 150 and can be used for fluids, gases and vapors. It can be easily automated by installing pneumatic, electrical or hydraulic actuators when replacing the gearbox.
Image credit: ARI-Armaturen