butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. The disc is positioned in the center of the pipe, passing through the disc is a rod connected to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position.

A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The “butterfly” is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

Butterfly Valves

ValPro manufactures a complete range of centric and offset butterfly valves. Delivered in a wide range of carbon and stainless steel materials.

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Groundhog AWWA Butterfly Valve

GROUNDHOG® valves in 4” – 72” sizes meet all requirements of AWWA C504. A Pratt MDT buried service actuator is standard, and either flanged, mechanical joint, push-on joint, wafer, or Victaulic® coupling styles are available.

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Mueller Lineseal XP Butterfly Valve

3″ – 48” Butterfly Valves Lineseal (Class 250B) Designed specifically for the waterworks industry, Lineseal® butterfly valves offer the ruggedness and reliability required for buried service and performance.

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