DAMPER BUTTERFLY VALVES :: FEATURES MMVI is glad to show you its range of damper valves SIRIO for regulation of warm air and fumes. Thanks to its fire safe design and the used materials (GG25+Ni+Cr - and other materials upon request) the SIRIO range can be used in all applications where a regulation of fumes at high temperature (up to +700°C) is requested. The fumes passage can be also closed with a minimum leakage. The valves can be manufactured with single or double rammer (single or double packaging) and upon request with holes for PN 2,5, PN 6, PN 10 and PN 16 connections. Upon request the valves can be manufactured in order to work with the fluid regulation at low temperature or with acid fumes. The dimensions we manufacture are from 3'' up to 48''. CONSTRUCTIVE VERSIONS The SIRIO range can be manufactured with the following connection: - WAFER with two or four holes for the valve centering. Lightness is its main advantage. - FLANGED with flanges at the two ends. - LUG with threaded holes in the body. This connection is more compact and with lower face to face   dimensions. - BUTTWELDING with two welding bevels made in accordance with standard and with the customer   requests. The welding bevels are equipped with centering ring for the positioning and line welding.