A butterfly valve is a type of control valve which is used for isolating or diverting the flow. The working mechanism takes place from the disc. Function is similar to that of a ball valve, which allows for quick close and open systems. Butterfly valves are selected because of their lower cost to other valves manufacturing techniques, also lighter in weight, meaning less support is required. Rotating disc is placed in the center of the valve body. Disc can be operated by either manual handle or

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... electrical actuators of various torques. The close-off pressure acting on the disc is directly proportional to the in-line pressure in pipe. The valve is selected according to the pressure and torque and pipe diameter, which allows lowering the damage the valve in operation. Fluid flow is controlled through piping systems, which in turn are connected to the valves. The valve body comprises of disc, which also controls the flow of fluid through various angles of opening. The disc is connected in Centre through the stem which is connected to either handle or the rotating actuator. The design of the valve body and disc is of much important for linear or equal percentage flow. Nowadays the equal percentage flow is obtained by characterizing disc, which allows to maintain the equal percentage flow at different differential pressure across the pipe. Sometimes it becomes very critical to maintain the equal percentage flow; CFD can predict the flow performance and rate of discharge through the valve. This paper focuses on the study of 8"and 20" valves performance factors and results obtained by analysis as well as from the load bearing capacity of the valve However special thanks to Prof. Yogesh Dodia for his guidance to make this paper rational and justifiable.