The butterfly valve is a popular and one of the most efficient and straightforward valves in the industry. It has only four main components: Disk, Body, Seat, Handle.
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Disk is the key part of the butterfly valve; it regulates, open and stop the flow of matter. The disk is connected to a rod that rotates when the handle or gear rotates by 90° or quarter-turn. The early use of the valve is to stop and open the flow, but someone sensed that it could also regulate the flow. So, now it is used in different industries and motor vehicles to control the flow.
Then we have the body; usually, the valve is encased in an average body, but the ball type has two types of bodies. The first one is lug type body; it has lugs that stick out as bolt holes. Lug types are expensive but allow the removal of downstream piping. The other one is wafer type; it doesn&#;t have any lugs. Instead, it is placed between two pipes. The wafer type cost less, but the design doesn&#;t transfer the weight directly to the pipe system.
The seat is a handy part of every valve. It sits between the body and the disc and provides ideal flow restriction. It can be bonded or locked in the valve and has different body materials like polymer and metals. The metal ones are for high-temperature applications.
The handle is the part that makes the quarter turn to rotate the disk in the close or open state. It can be a handle, gear or an automatic actuator system.
Valves are made of a wide variety of materials. The options are limitless, and they can range from PVC to stainless steel. Some of the most common materials popular in butterfly valve manufacturing are cast iron and PVC.
Cast Iron Butterfly Valves
Cast iron is a metal that has more structural integrity and withstands extreme temperatures. Butterfly valves made of cast iron are mostly used for industrial processes that require tougher valves. It is the most cost-effective option compared to other types of valves as it is versatile, long-lasting, and perfect for a variety of industrial applications.
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Also Read : The 411 On How Butterfly Valves Work!
PVC Butterfly Valves
PVC is a common plastic material used for making butterfly valves. PVCs are lightweight and have high compatibility with most chemicals. It possesses good structural integrity and is an inexpensive choice compared to metals. PVC butterfly valves are ideal for applications that have low to moderate intensity.
The body type of valves differentiates the way valves fit the pipeline. Butterfly valves come in two different body types, namely Lug style and Wafer style.
Lug Style Butterfly Valves
Lug Valves are more suitable for applications that require constant maintenance and cleaning. These valves come with two sets of different bolts. One set attaches to each flange, and the remaining set is placed between the piping and valve to form a strong seal. You can remove the adjacent pieces of the piping while the application is operating.
Wafer Style Butterfly Valves
Wafer valves come with 2 or 4 holes that align and secures the valve to the pipeline. They can handle twice the pressure compared to lug valves. Wafer valves do not come with bolt mounts and are tough to maintain, which is a downer. You need to shut down the system for any maintenance work.
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