butterfly valves are quarter-turn valves
A butterfly valve is a sturdy type of quarter turn valve. It consists of an
internal disk with a stem through the middle (across the diameter) that attaches
to an external actuator. Turning the actuator such that the disk is in line with
the pipe allows relatively unrestricted flow. Turning the actuator a
quarter-turn moves the disk to a perpendicular position to shut off flow.
Various positions between the off and on positions allow for partial
flow.
The various types of quarter-turn valves are versatile, but each is
best suited for a particular situation. Butterfly valves are excellent for
fluid, as opposed to gas, applications, especially in cisterns and a wide range
of pipe sizes. Some industrial butterfly valves have a hand operated valve,
while others turn by electric motor or pneumatics.
Here are a few
parameters of industrial butterfly valves:
1. Butterfly valve sizes range
from less than 1 inch to over 200 inches.
2. Butterfly valve housings are
either wafers or lugs that match pipe flanges.
3. High pressure butterfly
valves or a high performance butterfly valve can handle pressure in excess of
700 psi or temperatures up to 1000 degrees Fahrenheit.
