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About Butterfly Valves
A butterfly valve is a particular type of valve that
uses either a circular vane or a disc as the shut-off mechanism. Butterfly
valves have a quick opening/closing quarter-turn mechanism that is used
to control the flow of liquid through a piping system. They typically
pivot on axes perpendicular to the direction of flow inside the flow chamber.
Compared with ball
valves, butterfly valves do not have pockets to trap fluids when the
valve is in the closed position. Butterfly valves are frequently used
as throttling devices, controlling the levels of flow in various positions:
entirely closed, entirely open or partially open. They can control various
substances of air, liquid or solid currents and are situated on a spindle
that allows for flow in a single direction.
Butterfly valves are offered in many sized diameters, resulting in different
flow rates. Smaller valve assemblies may be used where space is limited.
Knowing the pipe dimensions, desired flow rate and material is important
when considering a valve investment. Installation time is typically low
compared to some other types of valves, and additional parts are unnecessary
to work and maintain the valve. Butterfly valves have a lever that allows
the operator to open or close the valve to control the flow. These valves
are part of a family known as rotary valves, which are defined by the
quarter turn that is used to move from the open to closed position and
vice versa. This results in a lower surface friction, which means that
these valves can be smaller than others and still operate efficiently.
Butterfly valves are available in numerous closure types and body configurations,
depending on the type of flow control needed. These types of valves are
commonly composed of metals, like aluminum and stainless
steel, but also can be made from various plastics.
One kind, flange butterfly valves, can be mounted between flanges. Another,
lug butterfly valves, uses metal inserts that are attached to the valve’s
bolt holes. Using an independent set of bolts for each flange, this valve
assembly is fixed between two flanges. Finally, wafer style butterfly
valves are the cheapest and most popular type of butterfly valves because
of their simplicity and ease of use.
Butterfly valves are used in many food transporting and chemical plants
where controllable product flow is required. Other specific industries
include HVAC, tertiary petroleum recovery and industries that use high
pressure water. When properly used, butterfly valves offer many benefits.
First of all, they are lower priced than many other types of valves, and
generally have a longer life cycle. Butterfly valves are easy to maintain,
are lightweight and compact and are able to handle a wide range of temperatures.
These valves are also very reliable because of their tight shut-off, reducing
the amount of leakage. One of the problems with butterfly valves, however,
is that their design makes it difficult to efficiently and thoroughly
clean all residual contaminants. Also, these valves are not good for use
with highly abrasive or corrosive materials, because the disc can be easily
eroded. Overall, butterfly valves are one of the fastest growing types
of valves in the industry.
Featured
Articles
http://www.valvesandactuators.com/va/hiperf.htm
http://www.sbt.siemens.com/HVP/Components/Documentation/15370192.pdf
Types of Butterfly Valves
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use various grade aluminums for their makeup. Aluminum is commendable
for its ultra lightweight and above average strength, but unlike stainless
steel, aluminum is prone to corrosion over time.
- are industrial companies that make butterfly valves.
-
are valves that have threaded metal inserts in the bolt holes that
allow a system to use two sets of bolts without nuts. Lug valves
are installed between two flanges and are used to disconnect one
side of the piping system without distributing the other.
-
are cheap and offer higher flexibility than their metal counterparts.
With these benefits, a lower maximum pressure and temperature stability
are to be expected.
- are the most common type of butterfly valves. Stainless
steel is used for its strength and anti-corrosive properties.
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are installed between two flanges and are secured using bolts or nuts
and studs.
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