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Demco Butterfly Valves Features and Benefits Bronze Bearings Eliminate stem seizures Provide reliable load support Minimize torque Positive Stem/Disc Orientation Rectangular stem drive 2"-24" Stem key drive 30"-36" Disc position clearly indicated

Hard-Backed Cartridge Seat

• Easier Installation
• Allows installation in closed position for use with fail-close actuators
• Eliminates high torque and premature failure caused by elastomer distortion as found in other seat designs

High Flow Disc

• Minimal stem boss in flow path

Integral Flange Seals

• No gaskets or O-rings required

Easy to Actuate

• Large top flange
• Flatted Stem 2"-12"

Dry Stem Journal

• Line fluid does not contact stems -- guaranteed

Blowout Proof Stem

• Tangential pin retains stem
• Retaining pin located in dry stem journal -- prevents pin corrosion from line fluid

Flexible Offering

• Wide material selection
• Multiple shut off pressures

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