Butterfly valves are commonly used in piping systems to control or regulate the flow of fluids. Two common types of butterfly valves are double-flanged butterfly valves and lug-type butterfly valves.
Double flanged butterfly valves are designed with flanges on both sides of the valve body. These flanges allow for easy installation and removal of the valve from the pipeline. Double-flanged butterfly valves are typically used in larger-diameter piping systems, where they are often used for isolation or shut-off applications.
Lug-type butterfly valves, on the other hand, are designed with threaded inserts or “lugs” on either side of the valve body. These lugs allow the valve to be bolted directly to the pipeline, without the need for additional flanges. Lug-type butterfly valves are often used in smaller-diameter piping systems, where they are used for both isolation and throttling applications.
One advantage of double-flanged butterfly valves is that they are more easily removable from the pipeline than lug-type butterfly valves. This can be an important consideration in systems where frequent maintenance or repair is necessary. However, double-flanged butterfly valves are typically more expensive than lug-type butterfly valves, due to the additional flanges required.
Lug type butterfly valves are often used in applications where space is at a premium, as they are more compact than double-flanged butterfly valves. Additionally, lug type butterfly valves can often be installed in systems where it would be difficult or impossible to install a double-flanged butterfly valve.
Ultimately, the choice between a double-flanged butterfly valve and a lug-type butterfly valve depends on the specific application and the requirements of the piping system. Factors such as the diameter of the piping, the available space, and the frequency of maintenance and repair must all be taken into account when selecting a butterfly valve for a particular application.
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