One
of the most compact and
light-weight valves available.
Used for a wide range
of applications, the choice
of seat, lining and disc
options has Increased
significantly over recent
years making the valve
a popular choice. A wide
range of materials, sizes
and pressure ratings gives
reliable positive isolation
and moderate flow control
capability over a wide
range of applications
throughout the industry.
The metal seated valve
is well established in
petrochemical and oil
industries being lightweight,
firesafe and suitable
for actuation. Butterfly
valves offer a number
of advantages when used
for the proper application.
They may be used in a
wide 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.
Butterfly valves are quick
opening valves that consist
of a metal circular disc
or vane with its pivot axes
at right angles to the direction
of flow in the pipe, which
when rotated on a shaft,
seals against seats in the
valve body. They are normally
used as throttling valves
to control flow. Unlike
ball valves, butterfly valves
do not have any pockets
in which fluids may become
trapped when the valve is
closed.
