Butterfly Valves - Figure F990 - 025mm-500mm

The F990 has smooth flow characteristics, abrasion, erosion and corrosion resistance with a crevice free internal contour.

Features & Benefits:

• The one-piece wafer thin disc stem provides the very minimum obstruction to flow.
• Rounded, polished disc edge gives full concentric sealing, lower torques, longer seat life and bubble-tight shut-off.
• Wafer type split-body for easier maintenance.
• Body locating holes provide easy installation and a perfect centring of the valve between the flanges.
• Primary stem sealing by preloaded contact between flatted seat surface and rounded polished disc hub area exceeds the pressure rating of the valve and prevents leakage through shaft area to atmosphere.
• A secondary sealing is provided by the interference fit between shaft and shaft hole in seat at all positions.
• Top bushing absorbs actuator side thrust loads.
• A moulded-in O-ring provides flange sealing and eliminates need for gaskets.
• The seat is field replaceable and fully isolates the body and stem from the flow.
• AS 2129 Table E and ANSI Class 150 end connections as standard. Others available on request.
• The F990 is not recommended for dead end service.
• PED approved for valves 25-300mm.

• Size Range:
• 25-500mm
• 50 to 500mm for urethane and ceramic trims. 
• Pressure Rating
• 1000 kPa in 25 - 300mm S/S trims.
• 700 kPa in 50 - 300mm with rubber discs, Teflon or Urethane trims.
• 500 kPa in 350 - 500mm for all trims.
• 350 kPa in 25 - 300mm White Buna N.Up to 700 kPa

• Temperature Rating:
• Minus 40°C to 120°C with EPDM seats.
• Minus 18°C to 100°C with Buna N seats.
• Minus 15°C to 120°C with Teflon lined Buna N seats.
• Minus 30°C to 150°C with Teflon lined EPDM seats.
• 20°C to 80°C with Urethane seats.