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Pinch valve is a full bore or fully ported
type of control valve. No obstruction to flow
passage. Major components of a pinch valve consists
of body and a sleeve. The sleeve will contain the
flow media and isolate it from the environment hence
reducing contamination to the environment. Generally
used for slurries or processes with entrained
solids, because the flexible sleeve allows the valve
to close droptight around solids -- solids that
would typically be trapped by the seat or stuck in
crevices in globe, diaphragm, butterfly, gate, or
ball valves. The sleeve material can be selected
upon the corrosiveness and abrasiveness of the flow
media, a suitable synthetic polymer can be chosen.
Pinch valve may be the best type of valve for flow
control application if the operation temperature is
within the limit of the polymer. |
