Butterfly Valves: Various Types, Components and Applications
A butterfly valve is a form of control or isolation valve for fluid flow. The closing mechanism is a rotating disc.
The operation is similar to that of a ball valve, and it allows for quick shutoff. Butterfly valves are widely popular as they are lighter than other valves which makes them need less support as well as they are cost-effective. The disc is connected to an actuator on the valve's outer by a rod that travels through it. Rotating the actuator causes the disc to be spun perpendicular or parallel to the flow. Unlike a ball valve, the disc remains in the flow, generating a pressure drop even while the valve is open.
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Applications:
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Water supply
●
Wastewater treatment
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Fire protection
●
Vacuum services
●
Lubrication System
●
Chemical and oil industries
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Fuel handling systems
●
Power generation
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Compressed air and/or gas services
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Steam Services
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Food Processing
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Pharmaceutical
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Marine System
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Sanitary Valve Application.
Common Components used in a
Butterfly Valve:
A butterfly valve is made up of four
main parts: the shell, the disc, the stem, and the seat.
● Valve body: Two pipe flanges are present on the bodies of Butterfly
Valves, with the lug and wafer body form being the most prevalent.
● Butterfly valve disk: The disc is the stumbling block to
the flow (disc). To optimise the sealing, movement, as well as operating
torque, distinct disc designs and orientations are typically used.
● Valve Stem: A single-piece or double-piece shaft arrangement makes up the
butterfly valve stem. Between the similar corrosion-resistant materials, the
stem design of the valve needs to eliminate the galling possibility.
● Butterfly Valve Seat: To provide cutoff, a butterfly valve's seat uses an interference fit between the seat and the edge of the disc. The seat can be secured by glueing, pressing, or locking it in place.
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Types of Butterfly Valves:
●
Concentric butterfly valves:
Concentric butterfly valves have a
strong rubber seat with a metal disc.
●
Doubly-eccentric butterfly valves:
They're also known as double-offset
butterfly valves or high-performance butterfly valves. Seats and discs are also
made from a variety of materials.
●
Triply-eccentric butterfly valves:
Triple-offset butterfly valves are
another name for them. Typically, manufactured seats are laminated or solid
metal.
●
Wafer-style butterfly valve:
The wafer style butterfly valve is designed to prevent backflow in unidirectional flow systems by maintaining a seal against bi-directional pressure differentials. There are numerous ways to accomplish this, one of which is to use a tight-fitting seal.
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●
Lug-style butterfly valve:
Lug-style valves have threaded
inserts on both sides of the valve body. As a result, they can be installed
with only two sets of bolts and no nuts in a system. The valve is installed
between two flanges, each with its own set of nuts. This arrangement allows any
side of the pipe system to be disconnected without causing damage to the other.
●
Rotary valve:
Rotary valves are a form of butterfly valve popular in the powder processing sector. Instead of being flat, the butterfly contains pockets. It works like a butterfly valve when closed and is incredibly tight. When the valve is in rotation, however, the pockets enable a predetermined amount of solids to descend, making the valve suitable for gravity dosing of bulk products. Pneumatically operated valves with a diameter of fewer than 300 millimetres rotate 180 degrees back and forth.
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