A flanged butterfly valve regulates fluid flow in a piping system. It has a cylindrical housing with a metal disc that opens and closes by rotating on a metal rod. The valve can be manually or mechanically operated and has a flange for installation with various connection hardware.
A flanged butterfly valve is usually cylindrical in shape and is typically installed in a piping system or as an inlet or outlet in a closed type of system and used to regulate the flow of a material, liquid or granular, which acts as a fluid with respect to the flow. A flange, when the word is used to refer to a valve, is a collar that is used as an anchor point for the installation. The flange is typically pre-drilled with bolt holes to connect the valve to other sections of pipe, but some can be designed to connect to the system in a different way, such as with clamps or latches.
A butterfly valve is a cylindrical housing, which can look like a tube or a disc. A metal rod passes through the cylinder, viewed from the end, following the line of the diameter of the circles formed by the ends of the cylinder. Mounted on the rod is a circular metal disc that fits very precisely inside the cylinder and the pivot of the rod and disc assembly. The metal disc that forms the valve is vaguely reminiscent of a butterfly, with the metal rod representing the body and each half of the metal disc representing the wings, and is the source of the name for this type of valve.
The position of the metal disc in the flanged butterfly valve determines whether the valve is closed or open. When the valve is closed, the disc is rotated to lie in a plane perpendicular to the flow through the valve, which blocks the cylinder, stopping flow. When opened, the disc lies in a plane parallel to the flow through the valve, allowing the flow of liquid or other material. The valve can be operated manually by a lever mechanism or controlled mechanically by actuators or hydraulics.
A flanged butterfly valve has a flange, or collar of material, that extends outward from the valve body but is not part of the valve mechanism itself. A butterfly valve, depending on the application, may have one or two flanges, located on one or both ends of the valve. The flange on a flanged butterfly valve serves as the anchor point for installing the valve and can be designed in a variety of ways to accept various connection hardware, such as bolts, latches, screws, or clamps.
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