Butterfly valves
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Within the quarter turn family of valves, ball valves are dominant in the sub-2 inch size category. Above 2 inches in size, butterfly valves become much more prevalent primarily for economic reasons. Butterfly valves exhibit a number of characteristics which make them especially well suited to use in general service type applications.
Those characteristics include: · Economical: Because butterfly valves can be designed in a physically compact package where the closure mechanism (disc) is partially contained by the system piping in the open position, they are very economic in terms of material usage. Since material costs are a significant portion of the product cost, the final valve is also very cost efficient. · Compact: The compact package also makes for a valve which is comparatively light and therefore relatively easy to handle. The compactness lends the valves to installation in places where other valves will not easily fit while the lightness makes installation and maintenance relatively easy. ·
Configuration: The variety of body styles in which butterfly valves are available lends the valves to a variety of installation configurations and preferences. Typical body style offerings include wafer, semi-lug, lugged, and flanged valves. · Performance: Butterfly valves are generally good performing valves in addition to being 3 economical. Performance characteristics for most designs include bi-directional sealing, low pressure loss at high flow rates, simple operation, and reliable sealing. · Actuation: A variety of actuation options exist for butterfly valves including handle operation (typically only valves 8” and smaller), manual gear operators, and a wide variety of power operators including pneumatic, electric, and hydraulic.
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