| Butterfly valve
is a type of valve which can be used in a variety of chemical services.
They are available with small dimensions allowing for use in areas
where space is limited, and they allow a high coefficient of flow.
A butterfly valve
is composed of body, soft seat or hard seat, disc, stem, packing,
notched position plate, and a lever or gear. The seat is under compression
when it is mounted in the valve body, thus making a seal around
the periphery of the disc both upper and lower points where the
stem passes through the seat. Packing is provided forming a positive
seal around the stem for added protection in case the seal formed
by the seat could become damaged.
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