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What is a Butterfly Valve?

Q. What is a Butterfly Valve?
A. Butterfly valves use a disc that is turned to open or close the flow.  A lever, gear, or actuated operators may be used.  On large sized valves, a gear operator is recommended due to the mount of torque needed to open or close the valve.  The term "lug style" refers to threads being integral to the valve and allows the valve to be used at the end of a piping system.  Otherwise, flanges on each side of the valve must be used.  With butterfly valves, the user must take precaution against the over-tightening of mating flanges.  If there is "full" liner, the only wetted parts are the liner and disc; this also eliminates the need for gaskets.  The recommended uses for butterfly valves are on/off and modulating service, suspended particles and high velocity systems. 
Title: What is a Butterfly Valve?
Description: A brief description of a butterly valve.
Published: 5/30/2003
Last Edited: 9/19/2013
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