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Butterfly valve is mainly consist of the valve body, a rotating shaft, valve plate, seat and drive mechanism. The valve to achieve the purpose of opening and closing and flow control by driving mechanism driven shaft and plate rotation. It is mainly used to cut off and throttle the flow in the pipeline.
The valve are apply to a variety of corrosive gas, liquid and solid powder medium.

A carbon steel cast iron rubber NBR seat double offset double flange type gear operated butterfly valve is a specific type of valve used to control the flow of fluid in a pipeline. Let's break down the different components and their functions:

Material:

Carbon Steel: This is the material used for the main body of the valve. Carbon steel offers strength and durability, making it suitable for industrial applications.

Cast Iron: Cast iron is used for the valve's body as well. It provides excellent corrosion resistance and is commonly used in valve construction.

Rubber NBR Seat: The seat of the valve is made of rubber, specifically Nitrile Butadiene Rubber (NBR). NBR offers good resistance to oils, fuels, and various fluids, making it suitable for sealing applications.

Double Offset:

The term "double offset" refers to the design of the valve's disc or "butterfly." It means that the centerline of the shaft is positioned behind the centerline of the sealing surface. This design provides a more efficient sealing mechanism and reduces friction during valve operation.

Double Flange Type:

A double flange type butterfly valve has flanges on both ends of the valve body. These flanges allow for easy installation and connection to the pipeline.

Gear Operated:

The valve is operated using a gear mechanism. A gear wheel is attached to the valve's shaft, and a handwheel or motor-driven gear is used to rotate the gear wheel. This gear mechanism provides precise control over the valve's opening and closing.

Butterfly Valve:

A butterfly valve is a type of quarter-turn valve. It consists of a disc or "butterfly" that rotates on a shaft inside the valve body. When the valve is fully open, the disc is perpendicular to the flow, allowing maximum flow through the pipeline. When closed, the disc aligns with the flow, blocking it completely.

Overall, a carbon steel cast iron rubber NBR seat double offset double flange type gear operated butterfly valve is a robust and versatile valve suitable for a wide range of industrial applications. It provides excellent sealing performance, durability, and precise control over fluid flow.