Keystone Figure 611/612 Butterfly Valves

•  F611 Wafer style resilient seated butterfly valves.BTV-015
•  F612 Lugged style resilient seated butterfly valves.
•  Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life and bubble-tight shut-off.
•  The seat is field replaceable and fully isolates the body and stem from the flow.
•  Primary stem sealing exceeds the pressure rating of the valve and prevents leakage through shaft area to atmosphere.
•  A secondary shaft seal provides back-up safety.
•  Top and bottom inboard shaft bearings for optimum support and minimum friction to prolong valve life.
•  Top bushing absorbs actuator side thrust loads.
•  Top seal prevents moisture penetrating into the shaft area.
•  The thin disc provides minimum obstruction to flow, resulting in smooth flow characteristics.
•  A molded-in O-ring in the seat for flange sealing eliminates the need for gaskets.
•  Extended body neck allows pipe insulation.
•  Body locating holes ease installation and centering between the flanges.
•  Available approvals: PED (CE Mark), DNV, Lloyds.