An Extremely negligible backlash between Stem & disc due to square drive.
Butterfly Valves (Lined) are designed to fit without gaskets between flanges drilled to ANSI 125 #, ANSI 150#, DIN., ND 10, 16, BS 10 Table D, E and F.
100% Factory tested under Water / Air / Vaccum before the valve is packed and shipped.
360° Disc Rotation.
Specifications:
Wafer, lug, double flanged or butt weld ends
Metal or soft seated
Leakage Class VI to ANSI FCI 70-2 / IEC 60534-4
Seat Itt Laminated 316SS/Graphite or special material