Like a butterfly cross your gaze interrupting the stimulation to your brain in a healthy way, the butterfly valve does the same obstructing the path of unwanted viscous products.
As we know, valves are used to interrupt product flow. Butterfly valves do the same thing. However, the butterfly valve is a better option than the general valves because of its advantages over the other types. Butterfly Valve is suitable for large valve applications due to compact, lightweight design that requires considerably less space than other valves. Due to a quick operation, it needs less time to open or close, and the maintenance costs are usually low compared to other valve types.
What is a Butterfly Valve
A butterfly valve is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates. It belongs to the family of quarter-turn valves. The butterfly valves are of three types, concentric butterfly valves, double eccentric butterfly valves, and triply-eccentric butterfly valves. It is used in pharmaceutical, food and chemical industries, to interrupt product flow in the process. However, the product flow may be solid, liquid, or gas.
It might be the perfect choice for your project, considering the advantages. However, one should know the tricks while selecting a butterfly valve for a particular operation.
Body Material of Butterfly Valve
This lightweight, non-ferrous metal exhibits atmospheric corrosion resistance. In valves, aluminum is used for exterior components such as identification tags and handwheels.
2) Ductile Iron
Special treatment modifies metallurgical structures, which yields higher mechanical properties.
3) Carbon Steel
Good mechanical properties, and strong resistance to stress corrosion. It can not only work in both high and low temperature but also has excellent fatigue strength.
4) Stainless Steel
Stainless steel can be of various types, including 400 Series Stainless Steel, 316 Stainless Steel, and others. The percentage of iron and carbon varies with the addition of other elements in making these types of stainless steel.
There are other materials, including gray iron, aluminum bronze, and others. One must check the utilities before choosing the type of material. So you might raise your hand for a more durable material or the one that works in high temperatures perfectly.
Body Types of Butterfly Valve
A typical butterfly valve has a small circular body, a round disk, shaft, and metal or soft seats. Based on the type of ends of the body, butterfly valves are available as both Flanged Ends, Wafer Type Ends, Lug Type Ends, Butt Welded Types Ends. The wafer body is placed between pipe flanges. The flange bolts surround the valve body. A wafer type butterfly valve is easy to install, but it cannot be used as an isolation valve. The lug body has protruding lugs in the periphery of a body that provides passage to bolt holes that match with those in the flanges.
Thus, it also has a range of body types to choose according to fitting.
1. Valve Seat
Butterfly valves can be metal-to-metal seated, soft seated, or with a fully lined body and disc. The first image shows a soft seated, fully lined body with a disc valve. Second is a soft seat with the metal disk, while the third is metal to metal seat type valve.
2. Valve end connection
There are four different types of butterfly valves. They are wafer type, semi-lug type, full-lug type, and double-flanged type. However, both wafer type and Semi lug types are easy to handle and lightweight, whereas full lug type and double-flanged types are suitable for a shipside valve.
3. Pressure rating and Valve temperature
Butterfly valves range in size from 1 into more than 200 in, and most have a pressure capability of 150-psi to 740-psi cold working pressure. The general temperature rating for a resilient seated valve is 25 Degrees F to 300 Degrees F. While for a high-performing butterfly valve, and the temperature is between 400 Degrees F to 450 Degrees F. A lug-style butterfly valve used in dead-end service generally has a reduced pressure rating.
Butterfly valves are the best solution with limited space problems. Moreover, they are also a good option at times for constraint budget. The pressure loss across a butterfly valve is also less, which acts as another advantage. However, there is a chance for cavitation and choke as the disk is always in the flow, turbulence flow can affect the disc movement. Thus would you rather choose a normal valve or the one that offers a range of variations and can also fit into the budget?
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