Thanks to the advancement of technology and material manufacturing, Butterfly valves have become more cost-effective and efficient. Needless to say, they provide high-quality leakage protection with several other benefits. A material that flows through a circular tube or pipe can be controlled with a butterfly valve. In most cases, it is used to control various materials such as liquid, gas, air, and steam. However, it can also be used to handle certain dry materials as well. It is also used in various industries (e.g. chemical, pharmaceutical, food industries) to interpose product flow (gas, liquid, solid) within the process.
What is a Butterfly Valve?
It is a shut-off valve that is used to regulate or isolate the flow of a material. It consists of a circular disc that has a pivot axis at precise angles. It is made up of a body, actuator, disc, seat, and stem. The body can be made of aluminum, stainless steel, carbon steel, ductile iron, cast iron, and even exotic metals. It is also classified as “quarter turn” valve.
Types of Butterfly Valves
Triple-Offset Valve:It has a unique design that prevents scratches and galling between the metal disc and seat. When there is a complete closure in the triple-offsetvalve, it is the only time the seal comes in contact with the metal seat. It is majorly used in applications where bi-directional tight shut-off is needed e.g. chemical, oil and gas factories.
Lugged Butterfly Valve:In this valve, bothsides of the valve body have threaded inserts. The threaded inserts ensure that the valve can be installed in the system without any nuts but only two sets of bolts. It is mostly used for dead-endservice because there is reduced pressure rating.
Wafer Butterfly Valve:It is specifically designed to hold a tight seal and prevent any backflow in systems that are specially designed for uni-directional flow by shielding against bi-directional pressure differential – it achieves all this in an exceptional manner with its tight-fittingseal. It is important to keep in mind that wafer butterfly valve cannot be used as end-of-line service.
Read More: Pneumatic Actuator
Advantages of Butterfly Valves
- They offer tight shut-off
- With the help of smooth flow, there is less liquid resistance
- They have throttling or On-Off applications
- They offer low-pressuredrop
- They are deemed as best for automation with 90 degreesoperating angle or low operating torque
- There is minimized weight and installation space
- There is no need for pipe system dislocation to install/remove them
- They are available in large diameters
- they have a simple structure
- they offer good regulation performance
- there is less torque
Applications of Butterfly Valves
– Cooling air, water, gases and other applications such as fire protection
– Food processing, pharmaceutical, and chemical services
– High-temperature and high-pressure steam and water services
– Vacuum services
– Throttling services
– Slurry services
– Garden irrigation systems
– Space restrictive services
– On-Off isolation
Butterfly valves are smaller as compared to other valve designs. They are lightweight and have easy installation and operation. Given the fact that these valves have easy installation and lower cost, they are replacing ball valves in many industries all over the world (especially industries such as petroleum). All in all, a butterfly valve can withstand extreme temperatures and is less costly as compared to other valve designs.