Butterfly valves - Design Construction and Features
Design Construction
The disc construction is Double Offset providing excellent controllability, bubble-tight shut off, greater seat life and smooth operation. Valves are specially designed for applications in chemical, petroleum, hydro carbons processing, pulp & paper and HVAC industries.
Well supported shafts with heavy duty bearings ensure perfect alignment of seat and disc for smooth and trouble-free operation. Valves have been rigorously tested to ensure industry performance requirements.
Features
► Valve body is solid, heavy duty. Seat Retainer construction allows flanged gasket conforming to ASME B16.20.
► Optimal disc geometry and cavity free flow passage offers minimum flow resistance and high Cv values.
► Heavy duty pins connecting valve shaft to disc avoid lost motion under high torque conditions.
► Long life, easy field-replaceable seat placed in body, away from flow steam, provides bubble tight shut off. Valves are equally suitable for control and tight shut off applications.
► Low-friction bearings provide maximum radial support for higher shaft loads. These PTFE-lined bearing having low coefficient of friction minimize operating torque and reduce actuator size. They are slip-in-place type, easy for assembly and disassembly.
► Seat options include PTFE and Flexible Metal Seats to suit variety of fluids and applications.
► The construction of dynamic sealing enables any abrasive wear of the stem packing to be spontaneously compensated, to ensure a real sealing of the valve stem. Whilst a blow-off proof design of the stem ensures the valves operation with more safety.
► Recommended for high-temperature, refinery, chemical, liquor and hydrocarbon service and for areas including throttling steam control, gas and vacuum applications, corrosive fluids, etc.