Keystone Model OptiSeal F14­F17 Butterfly Valves

Features

• Top bushing absorbs actuator side thrust loads.
• Actuator flange acc. ISO 5211.
• High solid, glossy, silicone free, paint system ensuring excellent corrosion resistance.
• Extended body neck allows pipe insulation.
• Body locating holes ease installation and centering between the flanges.
• 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 sealing provides back‑up safety.
• No flange gaskets required.
• High Cv value.
• Top and bottom shaft bearings for optimized support and minimum friction in all body materials up to DN 300, except cast iron.