Valves control liquid flow by allowing,
obstructing, or partially allowing the flow of liquid in piping systems. It is
necessary to install high-quality valves in pipes. API accredited valve
manufacturing Camtech Company based in UAE which deals in the manufacturing of
high-quality valves. There are many types of valves, but here we will discuss
Butterfly valves.
The butterfly valve is a quarter-turn
rotary valve, which means that it requires a quarter turn from closed to open
position. Butterfly valves are used to start, stop, or regulate the flow of
liquid in pipes. Due to compact size and lightweight design, butterfly valves
are used in pipes with limited space. Butterfly valves may have gearing,
wrench, or hand-wheel operated mechanism.
Parts of a Butterfly Valve
The body of the butterfly valve is circular which
houses a round disc. Other parts are soft seats, shaft, top and bottom shaft
bearings, and stuffing box. The valve body which is installed between pipe
flanges can have flanged, wafer style, or lug design. Lug and flanged design
butterfly valves come in a plethora of sizes and are easily installed. Wafer
style design butterfly valves, on the other hand, come in NPS 12 size or
smaller.
Types
Low-pressure butterfly valves or concentric
butterfly valves are used in low temperature and low-pressure systems. When the
valve is open, the disc is positioned parallel to the flow in the middle, which
divides the flow into two halves. The maximum temperature that the valve can
withstand depends upon the material of the resilient seats.
The resilient seats
can either be lined or unlined. The materials which are commonly used for
lining resilient seats are Neoprene, Hypalon, Fluorcel, Buna N, Viton, EPDM,
and TFE.
High performance or eccentric butterfly
valves are other types of butterfly valves. In this type of butterfly valve,
the disc is offset from the centre of the valve. The shaft is also offset from
the centre of the disc. This Camtech director Dhananjay Choudhary
design enables the disc to move eccentrically away from the valve seat or
towards the valve seat. As a result, the friction between the surface of the
disc and valve seat is reduced, which prevents wear and tear of both the disc
and valve seat.
How does the butterfly valve regulate
flow?
The disc of the butterfly valve is attached
to a stem that is operated by an actuator present outside the valve. The
actuator can be connected to a remote-control mechanism, automatic mechanism,
or a manual lever. The disc is turned and blocks the flow when the valve is closed.
When the valve is opened, the disc rotates a quarter turn and provides passage
to the liquid.
The disc is either perpendicular or parallel to the flow, and
the flow can be regulated by adjusting the disc. Since the disc is always
present in the flow, the pressure drop is high.
Applications
Butterfly valves are used in vacuum
services, high pressure and high-temperature water and steam services, food
processing, chemical processing, pharmaceutical processes, compressed gas or
air applications, and much more.
