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Rotating Butterfly Valves (view source)
Revision as of 21:49, 12 January 2013
, 21:49, 12 January 2013no edit summary
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[[File:Rotating Butterfly Valve.jpg|thumb|right|Rotating Butterfly Valves]] | |||
'''Rotating Butterfly Valve''' consists of disc rotating in trunnion bearings. In the open position the disc is edge-on, offering minimum resistance to flow. In the closed position it is rotated againt a seat.They are particularly attractive because they take up little more room than the pipe flange. Infact some [[Butterfly Valves]] are designed specially for insertion between pipe [[Flanges]], using through bolts. These are know as wafer butterfly valve. Other types are nomally single-flanged or double-flanged, know also as lug-body valves. | |||
Rotating butterfly valve movement is simple and straightforward, requiring only 90 degree rotation of the butterfly for full movement . The main disadvantage is that a simple butterfly design is difficult to render completely tight when closed, due to the absence of any wedging effect in this plane. This can be alleviated to a certain extent by seating the butterfly on a resilient ring on closure and/or offsetting the axis of rotation slightly so that, as well as rotating, as well as rotating, the blade has a movement in a plane at right angles to the spindle axis. | |||