A butterfly valve is a type of valve that controls or isolates the flow of a fluid. The closing mechanism is a rotating disc.
A butterfly valve is a member of the quarter-turn valve family. When the disc is turned a quarter turn, the valve is fully open or closed. The “butterfly” is a metal disc that is attached to a rod. When the valve is closed, the disc rotates to entirely block the route.
When the valve is fully open, the disc is turned a quarter turn, allowing nearly unfettered fluid circulation. To throttle flow, the valve can also be opened progressively.
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There are various types of butterfly valves, each designed for certain pressure and application. The pressure rating of the zero-offset butterfly valve, which exploits the flexibility of rubber, is the lowest. The high-performance double offset butterfly valve, which is utilised in somewhat higher-pressure systems, is offset from the disc seat and body seal centre lines (offset one) and the bore centre line (offset two) (offset two). During operation, this causes a cam action to pull the seat out of the seal, resulting in less friction than the zero offset design and a lower tendency to wear.
The triple offset butterfly valve is ideally suited for high-pressure systems. The disc seat contact axis is shifted in this valve, which essentially eliminates sliding contact between disc and seat. The seat of a triple offset valve is composed of metal so that it can be machined to obtain a bubble-tight shut-off when in contact with the disc.
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Types of Butterfly Valves:
● Concentric butterfly valves:
A robust rubber seat with a metal disc is used in this type of valve.
● Doubly-eccentric butterfly valves:
They are also known as high-performance butterfly valves or double-offset butterfly valves. Various materials are also used to manufacture seats and discs.
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● Triply-eccentric butterfly valves:
They are also known as triple-offset butterfly valves. The manufactured seats are usually laminated or made of solid metal.
● Wafer-style butterfly valve:
The wafer style butterfly valve is intended to maintain a seal against bi-directional pressure differentials in order to prevent backflow in unidirectional flow systems. There are several ways to achieve this, including utilising a tightly fitting seal.
● Lug-style butterfly valve:
Threaded inserts are located on both sides of the valve body in lug-style valves. As a result, they can be placed into a system with just two sets of bolts and no nuts. The valve is fitted between two flanges with a different set of bolts for each flange. This configuration allows either side of the pipe system to be detached without disrupting the other.
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In general, a lug-style butterfly valve used in dead-end service has a lower pressure rating. A lug-style butterfly valve positioned between two flanges, for example, has a pressure rating of 1,000 kPa (150 psi). In dead-end service, the same valve with one flange has a 520 kPa (75 psi) rating. Due to their great chemical and solvent resistance, as well as their high temperature resistance (200°C), they are a very flexible solution.
● Rotary valve:
Rotary valves are a type of butterfly valve that is used mostly in the powder processing industry. The butterfly, rather than being flat, has pockets. When closed, it functions just like a butterfly valve and is extremely tight. However, when it is in rotation, the pockets allow for the falling of a predetermined amount of solids, making the valve suited for gravity dosing of bulk items. Valves with a diameter of fewer than 300 millimeters are pneumatically controlled with a 180 degree back and forth rotation.
