Flange Type Butterfly Valve
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Triple offset Butterfly Valve
Triple eccentric or double eccentric design
Metal to metal seated
Blow-out proof shaft
Wafer, wafer-lug, double flange ends
ISO top flange
Our triple offset valve, also known in the industry as triple eccentric or triple offset butterfly valve, represents an important step forward compared to traditional process valves, such as gate, ball, globe and plug valves. Although LLV shares the same cone-to-cone principle with a globe valve, sealing is performed by applying quarter turn rotation instead.Three offsets against the symmetrical axes of the pipe/valve eliminate any possibility of rubbing:
The shaft is placed behind the plane of the sealing surface to provide a continuous seat path.
The shaft is placed to one side of the pipe/valve centerline to allow the displacement of the seal from the seat during the 90° opening.
The seat and seal cone centerlines are inclined in respect to the pipe/valve centerline. This third offset completely eliminates rubbing.
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